* [PATCH HID 12/13] HID: bpf: Artist24: remove unused variable
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires, Peter Hutterer
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
warning: unused variable ‘tilt’ [-Wunused-variable]
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/progs/XPPen__Artist24.bpf.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
index bc0b85c38445..d4d062c3a653 100644
--- a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
+++ b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
@@ -158,7 +158,6 @@ int BPF_PROG(xppen_24_fix_eraser, struct hid_bpf_ctx *hctx)
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
__u8 current_state, changed_state;
bool prev_tip;
- __u16 tilt;
if (!data)
return 0; /* EPERM check */
--
2.44.0
^ permalink raw reply related
* [PATCH HID 11/13] Documentation: HID: add a small blurb on udev-hid-bpf
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
This is the current decision we took: we don't provide automatic loading
of HID-BPF by the kernel directly, but rely on an external tool for it.
This tool is currently udev-hid-bpf, so let's make people aware of it.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
Documentation/hid/hid-bpf.rst | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
index bb8457bf15dd..7b151a2aef63 100644
--- a/Documentation/hid/hid-bpf.rst
+++ b/Documentation/hid/hid-bpf.rst
@@ -129,6 +129,23 @@ When a BPF program needs to emit input events, it needs to talk with the HID
protocol, and rely on the HID kernel processing to translate the HID data into
input events.
+In-tree HID-BPF programs and ``udev-hid-bpf``
+=============================================
+
+Official device fixes are shipped in the kernel tree as source in the
+``drivers/hid/bpf/progs`` directory. This allows to add selftests to them in
+``tools/testing/selftests/hid``.
+
+However, the compilation of these objects is not part of a regular kernel compilation
+given that they need an external tool to be loaded. This tool is currently
+`udev-hid-bpf <https://libevdev.pages.freedesktop.org/udev-hid-bpf/index.html>`_.
+
+For convenience, that external repository duplicates the files from here in
+``drivers/hid/bpf/progs`` into its own ``src/bpf/stable`` directory. This allows
+distributions to not have to pull the entire kernel source tree to ship and package
+those HID-BPF fixes. ``udev-hid-bpf`` also has capabilities of handling multiple
+objects files depending on the kernel the user is running.
+
Available types of programs
===========================
--
2.44.0
^ permalink raw reply related
* [PATCH HID 10/13] Documentation: HID: amend HID-BPF for struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
Now that we are using struct_ops, the docs need to be changed.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
Documentation/hid/hid-bpf.rst | 145 +++++++++++++++++++-----------------------
include/linux/hid_bpf.h | 8 +--
2 files changed, 71 insertions(+), 82 deletions(-)
diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst
index 0765b3298ecf..bb8457bf15dd 100644
--- a/Documentation/hid/hid-bpf.rst
+++ b/Documentation/hid/hid-bpf.rst
@@ -132,16 +132,17 @@ input events.
Available types of programs
===========================
-HID-BPF is built "on top" of BPF, meaning that we use tracing method to
+HID-BPF is built "on top" of BPF, meaning that we use bpf struct_ops method to
declare our programs.
HID-BPF has the following attachment types available:
-1. event processing/filtering with ``SEC("fmod_ret/hid_bpf_device_event")`` in libbpf
+1. event processing/filtering with ``SEC("struct_ops/hid_device_event")`` in libbpf
2. actions coming from userspace with ``SEC("syscall")`` in libbpf
-3. change of the report descriptor with ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` in libbpf
+3. change of the report descriptor with ``SEC("struct_ops/hid_rdesc_fixup")`` or
+ ``SEC("struct_ops.s/hid_rdesc_fixup")`` in libbpf
-A ``hid_bpf_device_event`` is calling a BPF program when an event is received from
+A ``hid_device_event`` is calling a BPF program when an event is received from
the device. Thus we are in IRQ context and can act on the data or notify userspace.
And given that we are in IRQ context, we can not talk back to the device.
@@ -149,37 +150,42 @@ A ``syscall`` means that userspace called the syscall ``BPF_PROG_RUN`` facility.
This time, we can do any operations allowed by HID-BPF, and talking to the device is
allowed.
-Last, ``hid_bpf_rdesc_fixup`` is different from the others as there can be only one
+Last, ``hid_rdesc_fixup`` is different from the others as there can be only one
BPF program of this type. This is called on ``probe`` from the driver and allows to
-change the report descriptor from the BPF program. Once a ``hid_bpf_rdesc_fixup``
+change the report descriptor from the BPF program. Once a ``hid_rdesc_fixup``
program has been loaded, it is not possible to overwrite it unless the program which
inserted it allows us by pinning the program and closing all of its fds pointing to it.
+Note that ``hid_rdesc_fixup`` can be declared as sleepable (``SEC("struct_ops.s/hid_rdesc_fixup")``).
+
+
Developer API:
==============
-User API data structures available in programs:
------------------------------------------------
+Available ``struct_ops`` for HID-BPF:
+-------------------------------------
.. kernel-doc:: include/linux/hid_bpf.h
+ :identifiers: hid_bpf_ops
-Available tracing functions to attach a HID-BPF program:
---------------------------------------------------------
-.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
- :functions: hid_bpf_device_event hid_bpf_rdesc_fixup
+User API data structures available in programs:
+-----------------------------------------------
+
+.. kernel-doc:: include/linux/hid_bpf.h
+ :identifiers: hid_bpf_ctx hid_bpf_attach_flags
-Available API that can be used in all HID-BPF programs:
--------------------------------------------------------
+Available API that can be used in all HID-BPF struct_ops programs:
+------------------------------------------------------------------
.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
- :functions: hid_bpf_get_data
+ :identifiers: hid_bpf_get_data
-Available API that can be used in syscall HID-BPF programs:
------------------------------------------------------------
+Available API that can be used in syscall HID-BPF programs or in sleepable HID-BPF struct_ops programs:
+-------------------------------------------------------------------------------------------------------
.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
- :functions: hid_bpf_attach_prog hid_bpf_hw_request hid_bpf_hw_output_report hid_bpf_input_report hid_bpf_allocate_context hid_bpf_release_context
+ :identifiers: hid_bpf_hw_request hid_bpf_hw_output_report hid_bpf_input_report hid_bpf_allocate_context hid_bpf_release_context
General overview of a HID-BPF program
=====================================
@@ -222,8 +228,10 @@ This allows the following:
Effect of a HID-BPF program
---------------------------
-For all HID-BPF attachment types except for :c:func:`hid_bpf_rdesc_fixup`, several eBPF
-programs can be attached to the same device.
+For all HID-BPF attachment types except for :c:func:`hid_rdesc_fixup`, several eBPF
+programs can be attached to the same device. If a HID-BPF struct_ops has a
+:c:func:`hid_rdesc_fixup` while another is already attached to the device, the
+kernel will return `-EINVAL` when attaching the struct_ops.
Unless ``HID_BPF_FLAG_INSERT_HEAD`` is added to the flags while attaching the
program, the new program is appended at the end of the list.
@@ -234,8 +242,8 @@ from the device.
Note that if there are multiple programs using the ``HID_BPF_FLAG_INSERT_HEAD`` flag,
only the most recently loaded one is actually the first in the list.
-``SEC("fmod_ret/hid_bpf_device_event")``
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+``SEC("struct_ops/hid_device_event")``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Whenever a matching event is raised, the eBPF programs are called one after the other
and are working on the same data buffer.
@@ -258,17 +266,17 @@ with, userspace needs to refer to the device by its unique system id (the last 4
in the sysfs path: ``/sys/bus/hid/devices/xxxx:yyyy:zzzz:0000``).
To retrieve a context associated with the device, the program must call
-:c:func:`hid_bpf_allocate_context` and must release it with :c:func:`hid_bpf_release_context`
+hid_bpf_allocate_context() and must release it with hid_bpf_release_context()
before returning.
Once the context is retrieved, one can also request a pointer to kernel memory with
-:c:func:`hid_bpf_get_data`. This memory is big enough to support all input/output/feature
+hid_bpf_get_data(). This memory is big enough to support all input/output/feature
reports of the given device.
-``SEC("fmod_ret/hid_bpf_rdesc_fixup")``
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+``SEC("struct_ops/hid_rdesc_fixup")``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-The ``hid_bpf_rdesc_fixup`` program works in a similar manner to
-``.report_fixup`` of ``struct hid_driver``.
+The ``hid_rdesc_fixup`` program works in a similar manner to ``.report_fixup``
+of ``struct hid_driver``.
When the device is probed, the kernel sets the data buffer of the context with the
content of the report descriptor. The memory associated with that buffer is
@@ -277,33 +285,31 @@ content of the report descriptor. The memory associated with that buffer is
The eBPF program can modify the data buffer at-will and the kernel uses the
modified content and size as the report descriptor.
-Whenever a ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` program is attached (if no
-program was attached before), the kernel immediately disconnects the HID device
-and does a reprobe.
+Whenever a struct_ops containing a ``SEC("struct_ops/hid_rdesc_fixup")`` program
+is attached (if no program was attached before), the kernel immediately disconnects
+the HID device and does a reprobe.
-In the same way, when the ``SEC("fmod_ret/hid_bpf_rdesc_fixup")`` program is
-detached, the kernel issues a disconnect on the device.
+In the same way, when this struct_ops is detached, the kernel issues a disconnect
+on the device.
There is no ``detach`` facility in HID-BPF. Detaching a program happens when
-all the user space file descriptors pointing at a program are closed.
+all the user space file descriptors pointing at a HID-BPF struct_ops link are closed.
Thus, if we need to replace a report descriptor fixup, some cooperation is
required from the owner of the original report descriptor fixup.
-The previous owner will likely pin the program in the bpffs, and we can then
+The previous owner will likely pin the struct_ops link in the bpffs, and we can then
replace it through normal bpf operations.
Attaching a bpf program to a device
===================================
-``libbpf`` does not export any helper to attach a HID-BPF program.
-Users need to use a dedicated ``syscall`` program which will call
-``hid_bpf_attach_prog(hid_id, program_fd, flags)``.
+We now use standard struct_ops attachment through ``bpf_map__attach_struct_ops()``.
+But given that we need to attach a struct_ops to a dedicated HID device, the caller
+must set ``hid_id`` in the struct_ops map before loading the program in the kernel.
``hid_id`` is the unique system ID of the HID device (the last 4 numbers in the
sysfs path: ``/sys/bus/hid/devices/xxxx:yyyy:zzzz:0000``)
-``progam_fd`` is the opened file descriptor of the program to attach.
-
-``flags`` is of type ``enum hid_bpf_attach_flags``.
+One can also set ``flags``, which is of type ``enum hid_bpf_attach_flags``.
We can not rely on hidraw to bind a BPF program to a HID device. hidraw is an
artefact of the processing of the HID device, and is not stable. Some drivers
@@ -358,32 +364,15 @@ For that, we can create a basic skeleton for our BPF program::
extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
unsigned int offset,
const size_t __sz) __ksym;
- extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
__uint(max_entries, 4096 * 64);
} ringbuf SEC(".maps");
- struct attach_prog_args {
- int prog_fd;
- unsigned int hid;
- unsigned int flags;
- int retval;
- };
-
- SEC("syscall")
- int attach_prog(struct attach_prog_args *ctx)
- {
- ctx->retval = hid_bpf_attach_prog(ctx->hid,
- ctx->prog_fd,
- ctx->flags);
- return 0;
- }
-
__u8 current_value = 0;
- SEC("?fmod_ret/hid_bpf_device_event")
+ SEC("struct_ops/hid_device_event")
int BPF_PROG(filter_switch, struct hid_bpf_ctx *hid_ctx)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 192 /* size */);
@@ -407,37 +396,37 @@ For that, we can create a basic skeleton for our BPF program::
return 0;
}
-To attach ``filter_switch``, userspace needs to call the ``attach_prog`` syscall
-program first::
+ SEC(".struct_ops.link")
+ struct hid_bpf_ops haptic_tablet = {
+ .hid_device_event = (void *)filter_switch,
+ };
+
+
+To attach ``haptic_tablet``, userspace needs to set ``hid_id`` first::
static int attach_filter(struct hid *hid_skel, int hid_id)
{
- int err, prog_fd;
- int ret = -1;
- struct attach_prog_args args = {
- .hid = hid_id,
- };
- DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattrs,
- .ctx_in = &args,
- .ctx_size_in = sizeof(args),
- );
+ int err, link_fd;
- args.prog_fd = bpf_program__fd(hid_skel->progs.filter_switch);
+ hid_skel->struct_ops.haptic_tablet->hid_id = hid_id;
+ err = hid__load(skel);
+ if (err)
+ return err;
- prog_fd = bpf_program__fd(hid_skel->progs.attach_prog);
-
- err = bpf_prog_test_run_opts(prog_fd, &tattrs);
- if (err)
- return err;
+ link_fd = bpf_map__attach_struct_ops(hid_skel->maps.haptic_tablet);
+ if (!link_fd) {
+ fprintf(stderr, "can not attach HID-BPF program: %m\n");
+ return -1;
+ }
- return args.retval; /* the fd of the created bpf_link */
+ return link_fd; /* the fd of the created bpf_link */
}
Our userspace program can now listen to notifications on the ring buffer, and
is awaken only when the value changes.
When the userspace program doesn't need to listen to events anymore, it can just
-close the returned fd from :c:func:`attach_filter`, which will tell the kernel to
+close the returned bpf link from :c:func:`attach_filter`, which will tell the kernel to
detach the program from the HID device.
Of course, in other use cases, the userspace program can also pin the fd to the
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index c0682db73aeb..36cfaf092d0f 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -20,11 +20,9 @@ struct hid_device;
* struct hid_bpf_ctx - User accessible data for all HID programs
*
* ``data`` is not directly accessible from the context. We need to issue
- * a call to ``hid_bpf_get_data()`` in order to get a pointer to that field.
+ * a call to hid_bpf_get_data() in order to get a pointer to that field.
*
- * All of these fields are currently read-only.
- *
- * @hid: the ``struct hid_device`` representing the device itself
+ * @hid: the &struct hid_device representing the device itself
* @allocated_size: Allocated size of data.
*
* This is how much memory is available and can be requested
@@ -41,6 +39,8 @@ struct hid_device;
* ``size`` must always be less or equal than ``allocated_size`` (it is enforced
* once all BPF programs have been run).
* @retval: Return value of the previous program.
+ *
+ * ``hid`` and ``allocated_size`` are read-only, ``size`` and ``retval`` are read-write.
*/
struct hid_bpf_ctx {
const struct hid_device *hid;
--
2.44.0
^ permalink raw reply related
* [PATCH HID 09/13] selftests/hid: add subprog call test
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
I got a weird verifier error with a subprog once, so let's have a test
for it.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
tools/testing/selftests/hid/hid_bpf.c | 41 +++++++++++++++++++++++++++++++++
tools/testing/selftests/hid/progs/hid.c | 24 +++++++++++++++++++
2 files changed, 65 insertions(+)
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index 967dfe6b58cb..45e173db35bd 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -638,6 +638,47 @@ TEST_F(hid_bpf, raw_event)
ASSERT_EQ(buf[2], 52);
}
+/*
+ * Attach hid_first_event to the given uhid device,
+ * retrieve and open the matching hidraw node,
+ * inject one event in the uhid device,
+ * check that the program sees it and can change the data
+ */
+TEST_F(hid_bpf, subprog_raw_event)
+{
+ const struct test_program progs[] = {
+ { .name = "hid_subprog_first_event" },
+ };
+ __u8 buf[10] = {0};
+ int err;
+
+ LOAD_PROGRAMS(progs);
+
+ /* inject one event */
+ buf[0] = 1;
+ buf[1] = 42;
+ uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+ /* read the data from hidraw */
+ memset(buf, 0, sizeof(buf));
+ err = read(self->hidraw_fd, buf, sizeof(buf));
+ ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+ ASSERT_EQ(buf[0], 1);
+ ASSERT_EQ(buf[2], 47);
+
+ /* inject another event */
+ memset(buf, 0, sizeof(buf));
+ buf[0] = 1;
+ buf[1] = 47;
+ uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+
+ /* read the data from hidraw */
+ memset(buf, 0, sizeof(buf));
+ err = read(self->hidraw_fd, buf, sizeof(buf));
+ ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
+ ASSERT_EQ(buf[2], 52);
+}
+
/*
* Ensures that we can attach/detach programs
*/
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index 9adace26e8aa..efa3c7d292bc 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -35,6 +35,30 @@ struct hid_bpf_ops first_event = {
.hid_id = 2,
};
+int __hid_subprog_first_event(struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
+{
+ __u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
+
+ if (!rw_data)
+ return 0; /* EPERM check */
+
+ rw_data[2] = rw_data[1] + 5;
+
+ return hid_ctx->size;
+}
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_subprog_first_event, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
+{
+ return __hid_subprog_first_event(hid_ctx, type);
+}
+
+SEC(".struct_ops.link")
+struct hid_bpf_ops subprog_first_event = {
+ .hid_device_event = (void *)hid_subprog_first_event,
+ .hid_id = 2,
+};
+
SEC("?struct_ops/hid_device_event")
int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
--
2.44.0
^ permalink raw reply related
* [PATCH HID 08/13] HID: bpf: remove tracing HID-BPF capability
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
We can now rely on struct_ops as we cleared the users in-tree.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/Makefile | 2 +-
drivers/hid/bpf/entrypoints/Makefile | 93 ----
drivers/hid/bpf/entrypoints/README | 4 -
drivers/hid/bpf/entrypoints/entrypoints.bpf.c | 25 --
drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 248 -----------
drivers/hid/bpf/hid_bpf_dispatch.c | 193 +-------
drivers/hid/bpf/hid_bpf_dispatch.h | 8 -
drivers/hid/bpf/hid_bpf_jmp_table.c | 568 ------------------------
include/linux/hid_bpf.h | 37 +-
9 files changed, 8 insertions(+), 1170 deletions(-)
diff --git a/drivers/hid/bpf/Makefile b/drivers/hid/bpf/Makefile
index 1cb3f31e9335..d1f2b81788ca 100644
--- a/drivers/hid/bpf/Makefile
+++ b/drivers/hid/bpf/Makefile
@@ -8,4 +8,4 @@ LIBBPF_INCLUDE = $(srctree)/tools/lib
obj-$(CONFIG_HID_BPF) += hid_bpf.o
CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)
CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)
-hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o hid_bpf_struct_ops.o
+hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_struct_ops.o
diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile
deleted file mode 100644
index 43b99b5575cf..000000000000
--- a/drivers/hid/bpf/entrypoints/Makefile
+++ /dev/null
@@ -1,93 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-OUTPUT := .output
-abs_out := $(abspath $(OUTPUT))
-
-CLANG ?= clang
-LLC ?= llc
-LLVM_STRIP ?= llvm-strip
-
-TOOLS_PATH := $(abspath ../../../../tools)
-BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
-BPFTOOL_OUTPUT := $(abs_out)/bpftool
-DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
-BPFTOOL ?= $(DEFAULT_BPFTOOL)
-
-LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
-LIBBPF_OUTPUT := $(abs_out)/libbpf
-LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
-LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
-BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
-
-INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
-CFLAGS := -g -Wall
-
-VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
- $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
- ../../../../vmlinux \
- /sys/kernel/btf/vmlinux \
- /boot/vmlinux-$(shell uname -r)
-VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
-ifeq ($(VMLINUX_BTF),)
-$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
-endif
-
-ifeq ($(V),1)
-Q =
-msg =
-else
-Q = @
-msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
-MAKEFLAGS += --no-print-directory
-submake_extras := feature_display=0
-endif
-
-.DELETE_ON_ERROR:
-
-.PHONY: all clean
-
-all: entrypoints.lskel.h
-
-clean:
- $(call msg,CLEAN)
- $(Q)rm -rf $(OUTPUT) entrypoints
-
-entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)
- $(call msg,GEN-SKEL,$@)
- $(Q)$(BPFTOOL) gen skeleton -L $< > $@
-
-
-$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
- $(call msg,BPF,$@)
- $(Q)$(CLANG) -g -O2 --target=bpf $(INCLUDES) \
- -c $(filter %.c,$^) -o $@ && \
- $(LLVM_STRIP) -g $@
-
-$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
-ifeq ($(VMLINUX_H),)
- $(call msg,GEN,,$@)
- $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
-else
- $(call msg,CP,,$@)
- $(Q)cp "$(VMLINUX_H)" $@
-endif
-
-$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
- $(call msg,MKDIR,$@)
- $(Q)mkdir -p $@
-
-$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
- $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
- OUTPUT=$(abspath $(dir $@))/ prefix= \
- DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
-
-ifeq ($(CROSS_COMPILE),)
-$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
- $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
- OUTPUT=$(BPFTOOL_OUTPUT)/ \
- LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \
- LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
-else
-$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
- $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
- OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
-endif
diff --git a/drivers/hid/bpf/entrypoints/README b/drivers/hid/bpf/entrypoints/README
deleted file mode 100644
index 147e0d41509f..000000000000
--- a/drivers/hid/bpf/entrypoints/README
+++ /dev/null
@@ -1,4 +0,0 @@
-WARNING:
-If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h".
-Make sure to have clang 10 installed.
-See Documentation/bpf/bpf_devel_QA.rst
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
deleted file mode 100644
index c22921125a1a..000000000000
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ /dev/null
@@ -1,25 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2022 Benjamin Tissoires */
-
-#include ".output/vmlinux.h"
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_tracing.h>
-
-#define HID_BPF_MAX_PROGS 1024
-
-struct {
- __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
- __uint(max_entries, HID_BPF_MAX_PROGS);
- __uint(key_size, sizeof(__u32));
- __uint(value_size, sizeof(__u32));
-} hid_jmp_table SEC(".maps");
-
-SEC("fmod_ret/__hid_bpf_tail_call")
-int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
-{
- bpf_tail_call(ctx, &hid_jmp_table, hctx->index);
-
- return 0;
-}
-
-char LICENSE[] SEC("license") = "GPL";
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
deleted file mode 100644
index 35618051598c..000000000000
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ /dev/null
@@ -1,248 +0,0 @@
-/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
-#ifndef __ENTRYPOINTS_BPF_SKEL_H__
-#define __ENTRYPOINTS_BPF_SKEL_H__
-
-#include <bpf/skel_internal.h>
-
-struct entrypoints_bpf {
- struct bpf_loader_ctx ctx;
- struct {
- struct bpf_map_desc hid_jmp_table;
- } maps;
- struct {
- struct bpf_prog_desc hid_tail_call;
- } progs;
- struct {
- int hid_tail_call_fd;
- } links;
-};
-
-static inline int
-entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
-{
- int prog_fd = skel->progs.hid_tail_call.prog_fd;
- int fd = skel_raw_tracepoint_open(NULL, prog_fd);
-
- if (fd > 0)
- skel->links.hid_tail_call_fd = fd;
- return fd;
-}
-
-static inline int
-entrypoints_bpf__attach(struct entrypoints_bpf *skel)
-{
- int ret = 0;
-
- ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
- return ret < 0 ? ret : 0;
-}
-
-static inline void
-entrypoints_bpf__detach(struct entrypoints_bpf *skel)
-{
- skel_closenz(skel->links.hid_tail_call_fd);
-}
-static void
-entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
-{
- if (!skel)
- return;
- entrypoints_bpf__detach(skel);
- skel_closenz(skel->progs.hid_tail_call.prog_fd);
- skel_closenz(skel->maps.hid_jmp_table.map_fd);
- skel_free(skel);
-}
-static inline struct entrypoints_bpf *
-entrypoints_bpf__open(void)
-{
- struct entrypoints_bpf *skel;
-
- skel = skel_alloc(sizeof(*skel));
- if (!skel)
- goto cleanup;
- skel->ctx.sz = (void *)&skel->links - (void *)skel;
- return skel;
-cleanup:
- entrypoints_bpf__destroy(skel);
- return NULL;
-}
-
-static inline int
-entrypoints_bpf__load(struct entrypoints_bpf *skel)
-{
- struct bpf_load_and_run_opts opts = {};
- int err;
-
- opts.ctx = (struct bpf_loader_ctx *)skel;
- opts.data_sz = 2856;
- opts.data = (void *)"\
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-\0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
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-\x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\
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-\0\0";
- opts.insns_sz = 1192;
- opts.insns = (void *)"\
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-\0\0\x63\x7a\x80\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\
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-\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
- err = bpf_load_and_run(&opts);
- if (err < 0)
- return err;
- return 0;
-}
-
-static inline struct entrypoints_bpf *
-entrypoints_bpf__open_and_load(void)
-{
- struct entrypoints_bpf *skel;
-
- skel = entrypoints_bpf__open();
- if (!skel)
- return NULL;
- if (entrypoints_bpf__load(skel)) {
- entrypoints_bpf__destroy(skel);
- return NULL;
- }
- return skel;
-}
-
-__attribute__((unused)) static void
-entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused)))
-{
-#ifdef __cplusplus
-#define _Static_assert static_assert
-#endif
-#ifdef __cplusplus
-#undef _Static_assert
-#endif
-}
-
-#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 7216c3c7713d..06cc628e7bb4 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -3,7 +3,7 @@
/*
* HID-BPF support for Linux
*
- * Copyright (c) 2022 Benjamin Tissoires
+ * Copyright (c) 2022-2024 Benjamin Tissoires
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -17,34 +17,11 @@
#include <linux/kfifo.h>
#include <linux/minmax.h>
#include <linux/module.h>
-#include <linux/workqueue.h>
#include "hid_bpf_dispatch.h"
-#include "entrypoints/entrypoints.lskel.h"
struct hid_ops *hid_ops;
EXPORT_SYMBOL(hid_ops);
-/**
- * hid_bpf_device_event - Called whenever an event is coming in from the device
- *
- * @ctx: The HID-BPF context
- *
- * @return %0 on success and keep processing; a positive value to change the
- * incoming size buffer; a negative error code to interrupt the processing
- * of this event
- *
- * Declare an %fmod_ret tracing bpf program to this function and attach this
- * program through hid_bpf_attach_prog() to have this helper called for
- * any incoming event from the device itself.
- *
- * The function is called while on IRQ context, so we can not sleep.
- */
-/* never used by the kernel but declared so we can load and attach a tracepoint */
-__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
-{
- return 0;
-}
-
u8 *
dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
u32 *size, int interrupt)
@@ -52,7 +29,6 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
struct hid_bpf_ctx_kern ctx_kern = {
.ctx = {
.hid = hdev,
- .report_type = type,
.allocated_size = hdev->bpf.allocated_data,
.size = *size,
},
@@ -86,11 +62,6 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
}
rcu_read_unlock();
- ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
- if (ret < 0)
- return ERR_PTR(ret);
- ret = ctx_kern.ctx.retval;
-
if (ret) {
if (ret > ctx_kern.ctx.allocated_size)
return ERR_PTR(-EINVAL);
@@ -102,26 +73,6 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
}
EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
-/**
- * hid_bpf_rdesc_fixup - Called when the probe function parses the report
- * descriptor of the HID device
- *
- * @ctx: The HID-BPF context
- *
- * @return 0 on success and keep processing; a positive value to change the
- * incoming size buffer; a negative error code to interrupt the processing
- * of this event
- *
- * Declare an %fmod_ret tracing bpf program to this function and attach this
- * program through hid_bpf_attach_prog() to have this helper called before any
- * parsing of the report descriptor by HID.
- */
-/* never used by the kernel but declared so we can load and attach a tracepoint */
-__weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
-{
- return 0;
-}
-
u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
{
int ret;
@@ -133,16 +84,16 @@ u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *s
},
};
+ if (!hdev->bpf.rdesc_ops)
+ goto ignore_bpf;
+
ctx_kern.data = kzalloc(ctx_kern.ctx.allocated_size, GFP_KERNEL);
if (!ctx_kern.data)
goto ignore_bpf;
memcpy(ctx_kern.data, rdesc, min_t(unsigned int, *size, HID_MAX_DESCRIPTOR_SIZE));
- if (hdev->bpf.rdesc_ops)
- ret = hdev->bpf.rdesc_ops->hid_rdesc_fixup(&ctx_kern.ctx);
- else
- ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
+ ret = hdev->bpf.rdesc_ops->hid_rdesc_fixup(&ctx_kern.ctx);
if (ret < 0)
goto ignore_bpf;
@@ -242,39 +193,6 @@ int hid_bpf_reconnect(struct hid_device *hdev)
return 0;
}
-static int do_hid_bpf_attach_prog(struct hid_device *hdev, int prog_fd, struct bpf_prog *prog,
- __u32 flags)
-{
- int fd, err, prog_type;
-
- prog_type = hid_bpf_get_prog_attach_type(prog);
- if (prog_type < 0)
- return prog_type;
-
- if (prog_type >= HID_BPF_PROG_TYPE_MAX)
- return -EINVAL;
-
- if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
- err = hid_bpf_allocate_event_data(hdev);
- if (err)
- return err;
- }
-
- fd = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, prog, flags);
- if (fd < 0)
- return fd;
-
- if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
- err = hid_bpf_reconnect(hdev);
- if (err) {
- close_fd(fd);
- return err;
- }
- }
-
- return fd;
-}
-
/* Disables missing prototype warnings */
__bpf_kfunc_start_defs();
@@ -303,57 +221,6 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
return ctx_kern->data + offset;
}
-/**
- * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
- *
- * @hid_id: the system unique identifier of the HID device
- * @prog_fd: an fd in the user process representing the program to attach
- * @flags: any logical OR combination of &enum hid_bpf_attach_flags
- *
- * @returns an fd of a bpf_link object on success (> %0), an error code otherwise.
- * Closing this fd will detach the program from the HID device (unless the bpf_link
- * is pinned to the BPF file system).
- */
-/* called from syscall */
-__bpf_kfunc int
-hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
-{
- struct hid_device *hdev;
- struct bpf_prog *prog;
- int err, fd;
-
- if ((flags & ~HID_BPF_FLAG_MASK))
- return -EINVAL;
-
- hdev = hid_get_device(hid_id);
- if (IS_ERR(hdev))
- return PTR_ERR(hdev);
-
- /*
- * take a ref on the prog itself, it will be released
- * on errors or when it'll be detached
- */
- prog = bpf_prog_get(prog_fd);
- if (IS_ERR(prog)) {
- err = PTR_ERR(prog);
- goto out_dev_put;
- }
-
- fd = do_hid_bpf_attach_prog(hdev, prog_fd, prog, flags);
- if (fd < 0) {
- err = fd;
- goto out_prog_put;
- }
-
- return fd;
-
- out_prog_put:
- bpf_prog_put(prog);
- out_dev_put:
- hid_put_device(hdev);
- return err;
-}
-
/**
* hid_bpf_allocate_context - Allocate a context to the given HID device
*
@@ -583,21 +450,8 @@ static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
.set = &hid_bpf_kfunc_ids,
};
-/* our HID-BPF entrypoints */
-BTF_SET8_START(hid_bpf_fmodret_ids)
-BTF_ID_FLAGS(func, hid_bpf_device_event)
-BTF_ID_FLAGS(func, hid_bpf_rdesc_fixup)
-BTF_ID_FLAGS(func, __hid_bpf_tail_call)
-BTF_SET8_END(hid_bpf_fmodret_ids)
-
-static const struct btf_kfunc_id_set hid_bpf_fmodret_set = {
- .owner = THIS_MODULE,
- .set = &hid_bpf_fmodret_ids,
-};
-
/* for syscall HID-BPF */
BTF_KFUNCS_START(hid_bpf_syscall_kfunc_ids)
-BTF_ID_FLAGS(func, hid_bpf_attach_prog)
BTF_ID_FLAGS(func, hid_bpf_allocate_context, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE)
BTF_ID_FLAGS(func, hid_bpf_hw_request)
@@ -622,8 +476,6 @@ int hid_bpf_connect_device(struct hid_device *hdev)
break;
}
}
- if (rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]))
- need_to_allocate = true;
rcu_read_unlock();
/* only allocate BPF data if there are programs attached */
@@ -650,14 +502,12 @@ void hid_bpf_destroy_device(struct hid_device *hdev)
/* mark the device as destroyed in bpf so we don't reattach it */
hdev->bpf.destroyed = true;
- __hid_bpf_destroy_device(hdev);
__hid_bpf_ops_destroy_device(hdev);
}
EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
void hid_bpf_device_init(struct hid_device *hdev)
{
- spin_lock_init(&hdev->bpf.progs_lock);
INIT_LIST_HEAD(&hdev->bpf.prog_list);
mutex_init(&hdev->bpf.prog_list_lock);
}
@@ -670,37 +520,15 @@ static int __init hid_bpf_init(void)
/* Note: if we exit with an error any time here, we would entirely break HID, which
* is probably not something we want. So we log an error and return success.
*
- * This is not a big deal: the syscall allowing to attach a BPF program to a HID device
- * will not be available, so nobody will be able to use the functionality.
+ * This is not a big deal: nobody will be able to use the functionality.
*/
- err = register_btf_fmodret_id_set(&hid_bpf_fmodret_set);
- if (err) {
- pr_warn("error while registering fmodret entrypoints: %d", err);
- return 0;
- }
-
- err = hid_bpf_preload_skel();
- if (err) {
- pr_warn("error while preloading HID BPF dispatcher: %d", err);
- return 0;
- }
-
- /* register tracing kfuncs after we are sure we can load our preloaded bpf program */
- err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
- if (err) {
- pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
- return 0;
- }
-
- /* register struct_ops kfuncs after we are sure we can load our preloaded bpf program */
err = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &hid_bpf_kfunc_set);
if (err) {
pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
return 0;
}
- /* register syscalls after we are sure we can load our preloaded bpf program */
err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
if (err) {
pr_warn("error while setting HID BPF syscall kfuncs: %d", err);
@@ -710,15 +538,6 @@ static int __init hid_bpf_init(void)
return 0;
}
-static void __exit hid_bpf_exit(void)
-{
- /* HID depends on us, so if we hit that code, we are guaranteed that hid
- * has been removed and thus we do not need to clear the HID devices
- */
- hid_bpf_free_links_and_skel();
-}
-
late_initcall(hid_bpf_init);
-module_exit(hid_bpf_exit);
MODULE_AUTHOR("Benjamin Tissoires");
MODULE_LICENSE("GPL");
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index e52c43d81650..835e6f69f479 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -13,15 +13,7 @@ struct hid_bpf_ctx_kern {
struct hid_device *hid_get_device(unsigned int hid_id);
void hid_put_device(struct hid_device *hid);
int hid_bpf_allocate_event_data(struct hid_device *hdev);
-int hid_bpf_preload_skel(void);
-void hid_bpf_free_links_and_skel(void);
-int hid_bpf_get_prog_attach_type(struct bpf_prog *prog);
-int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd,
- struct bpf_prog *prog, __u32 flags);
-void __hid_bpf_destroy_device(struct hid_device *hdev);
void __hid_bpf_ops_destroy_device(struct hid_device *hdev);
-int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
- struct hid_bpf_ctx_kern *ctx_kern);
int hid_bpf_reconnect(struct hid_device *hdev);
struct bpf_prog;
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
deleted file mode 100644
index 8a54ba447718..000000000000
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ /dev/null
@@ -1,568 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-
-/*
- * HID-BPF support for Linux
- *
- * Copyright (c) 2022 Benjamin Tissoires
- */
-
-#include <linux/bitops.h>
-#include <linux/btf.h>
-#include <linux/btf_ids.h>
-#include <linux/circ_buf.h>
-#include <linux/filter.h>
-#include <linux/hid.h>
-#include <linux/hid_bpf.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/workqueue.h>
-#include "hid_bpf_dispatch.h"
-#include "entrypoints/entrypoints.lskel.h"
-
-#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
- * needs to be a power of 2 as we use it as
- * a circular buffer
- */
-
-#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
-#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
-
-/*
- * represents one attached program stored in the hid jump table
- */
-struct hid_bpf_prog_entry {
- struct bpf_prog *prog;
- struct hid_device *hdev;
- enum hid_bpf_prog_type type;
- u16 idx;
-};
-
-struct hid_bpf_jmp_table {
- struct bpf_map *map;
- struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
- int tail, head;
- struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
- unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
-};
-
-#define FOR_ENTRIES(__i, __start, __end) \
- for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
-
-static struct hid_bpf_jmp_table jmp_table;
-
-static DEFINE_MUTEX(hid_bpf_attach_lock); /* held when attaching/detaching programs */
-
-static void hid_bpf_release_progs(struct work_struct *work);
-
-static DECLARE_WORK(release_work, hid_bpf_release_progs);
-
-BTF_ID_LIST(hid_bpf_btf_ids)
-BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */
-BTF_ID(func, hid_bpf_rdesc_fixup) /* HID_BPF_PROG_TYPE_RDESC_FIXUP */
-
-static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
-{
- switch (type) {
- case HID_BPF_PROG_TYPE_DEVICE_EVENT:
- return HID_BPF_MAX_PROGS_PER_DEV;
- case HID_BPF_PROG_TYPE_RDESC_FIXUP:
- return 1;
- default:
- return -EINVAL;
- }
-}
-
-static int hid_bpf_program_count(struct hid_device *hdev,
- struct bpf_prog *prog,
- enum hid_bpf_prog_type type)
-{
- int i, n = 0;
-
- if (type >= HID_BPF_PROG_TYPE_MAX)
- return -EINVAL;
-
- if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP && hdev->bpf.rdesc_ops)
- n += 1;
-
- FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
- struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
-
- if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
- continue;
-
- if (hdev && entry->hdev != hdev)
- continue;
-
- if (prog && entry->prog != prog)
- continue;
-
- n++;
- }
-
- return n;
-}
-
-__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
-{
- return 0;
-}
-
-int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
- struct hid_bpf_ctx_kern *ctx_kern)
-{
- struct hid_bpf_prog_list *prog_list;
- int i, idx, err = 0;
-
- rcu_read_lock();
- prog_list = rcu_dereference(hdev->bpf.progs[type]);
-
- if (!prog_list)
- goto out_unlock;
-
- for (i = 0; i < prog_list->prog_cnt; i++) {
- idx = prog_list->prog_idx[i];
-
- if (!test_bit(idx, jmp_table.enabled))
- continue;
-
- ctx_kern->ctx.index = idx;
- err = __hid_bpf_tail_call(&ctx_kern->ctx);
- if (err < 0)
- break;
- if (err)
- ctx_kern->ctx.retval = err;
- }
-
- out_unlock:
- rcu_read_unlock();
-
- return err;
-}
-
-/*
- * assign the list of programs attached to a given hid device.
- */
-static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
- enum hid_bpf_prog_type type)
-{
- struct hid_bpf_prog_list *old_list;
-
- spin_lock(&hdev->bpf.progs_lock);
- old_list = rcu_dereference_protected(hdev->bpf.progs[type],
- lockdep_is_held(&hdev->bpf.progs_lock));
- rcu_assign_pointer(hdev->bpf.progs[type], new_list);
- spin_unlock(&hdev->bpf.progs_lock);
- synchronize_rcu();
-
- kfree(old_list);
-}
-
-/*
- * allocate and populate the list of programs attached to a given hid device.
- *
- * Must be called under lock.
- */
-static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
-{
- struct hid_bpf_prog_list *new_list;
- int i;
-
- if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
- return -EINVAL;
-
- if (hdev->bpf.destroyed)
- return 0;
-
- new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
- if (!new_list)
- return -ENOMEM;
-
- FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
- struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
-
- if (entry->type == type && entry->hdev == hdev &&
- test_bit(entry->idx, jmp_table.enabled))
- new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
- }
-
- __hid_bpf_set_hdev_progs(hdev, new_list, type);
-
- return 0;
-}
-
-static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
-{
- skel_map_delete_elem(map_fd, &idx);
- jmp_table.progs[idx] = NULL;
-}
-
-static void hid_bpf_release_progs(struct work_struct *work)
-{
- int i, j, n, map_fd = -1;
- bool hdev_destroyed;
-
- if (!jmp_table.map)
- return;
-
- /* retrieve a fd of our prog_array map in BPF */
- map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
- if (map_fd < 0)
- return;
-
- mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
-
- /* detach unused progs from HID devices */
- FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
- struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
- enum hid_bpf_prog_type type;
- struct hid_device *hdev;
-
- if (test_bit(entry->idx, jmp_table.enabled))
- continue;
-
- /* we have an attached prog */
- if (entry->hdev) {
- hdev = entry->hdev;
- type = entry->type;
- /*
- * hdev is still valid, even if we are called after hid_destroy_device():
- * when hid_bpf_attach() gets called, it takes a ref on the dev through
- * bus_find_device()
- */
- hdev_destroyed = hdev->bpf.destroyed;
-
- hid_bpf_populate_hdev(hdev, type);
-
- /* mark all other disabled progs from hdev of the given type as detached */
- FOR_ENTRIES(j, i, jmp_table.head) {
- struct hid_bpf_prog_entry *next;
-
- next = &jmp_table.entries[j];
-
- if (test_bit(next->idx, jmp_table.enabled))
- continue;
-
- if (next->hdev == hdev && next->type == type) {
- /*
- * clear the hdev reference and decrement the device ref
- * that was taken during bus_find_device() while calling
- * hid_bpf_attach()
- */
- next->hdev = NULL;
- put_device(&hdev->dev);
- }
- }
-
- /* if type was rdesc fixup and the device is not gone, reconnect device */
- if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP && !hdev_destroyed)
- hid_bpf_reconnect(hdev);
- }
- }
-
- /* remove all unused progs from the jump table */
- FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
- struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
-
- if (test_bit(entry->idx, jmp_table.enabled))
- continue;
-
- if (entry->prog)
- __hid_bpf_do_release_prog(map_fd, entry->idx);
- }
-
- /* compact the entry list */
- n = jmp_table.tail;
- FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
- struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
-
- if (!test_bit(entry->idx, jmp_table.enabled))
- continue;
-
- jmp_table.entries[n] = jmp_table.entries[i];
- n = NEXT(n);
- }
-
- jmp_table.head = n;
-
- mutex_unlock(&hid_bpf_attach_lock);
-
- if (map_fd >= 0)
- close_fd(map_fd);
-}
-
-static void hid_bpf_release_prog_at(int idx)
-{
- int map_fd = -1;
-
- /* retrieve a fd of our prog_array map in BPF */
- map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
- if (map_fd < 0)
- return;
-
- __hid_bpf_do_release_prog(map_fd, idx);
-
- close(map_fd);
-}
-
-/*
- * Insert the given BPF program represented by its fd in the jmp table.
- * Returns the index in the jump table or a negative error.
- */
-static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
-{
- int i, index = -1, map_fd = -1, err = -EINVAL;
-
- /* retrieve a fd of our prog_array map in BPF */
- map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
-
- if (map_fd < 0) {
- err = -EINVAL;
- goto out;
- }
-
- /* find the first available index in the jmp_table */
- for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
- if (!jmp_table.progs[i] && index < 0) {
- /* mark the index as used */
- jmp_table.progs[i] = prog;
- index = i;
- __set_bit(i, jmp_table.enabled);
- }
- }
- if (index < 0) {
- err = -ENOMEM;
- goto out;
- }
-
- /* insert the program in the jump table */
- err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
- if (err)
- goto out;
-
- /* return the index */
- err = index;
-
- out:
- if (err < 0)
- __hid_bpf_do_release_prog(map_fd, index);
- if (map_fd >= 0)
- close_fd(map_fd);
- return err;
-}
-
-int hid_bpf_get_prog_attach_type(struct bpf_prog *prog)
-{
- int prog_type = HID_BPF_PROG_TYPE_UNDEF;
- int i;
-
- for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
- if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
- prog_type = i;
- break;
- }
- }
-
- return prog_type;
-}
-
-static void hid_bpf_link_release(struct bpf_link *link)
-{
- struct hid_bpf_link *hid_link =
- container_of(link, struct hid_bpf_link, link);
-
- __clear_bit(hid_link->hid_table_index, jmp_table.enabled);
- schedule_work(&release_work);
-}
-
-static void hid_bpf_link_dealloc(struct bpf_link *link)
-{
- struct hid_bpf_link *hid_link =
- container_of(link, struct hid_bpf_link, link);
-
- kfree(hid_link);
-}
-
-static void hid_bpf_link_show_fdinfo(const struct bpf_link *link,
- struct seq_file *seq)
-{
- seq_printf(seq,
- "attach_type:\tHID-BPF\n");
-}
-
-static const struct bpf_link_ops hid_bpf_link_lops = {
- .release = hid_bpf_link_release,
- .dealloc = hid_bpf_link_dealloc,
- .show_fdinfo = hid_bpf_link_show_fdinfo,
-};
-
-/* called from syscall */
-noinline int
-__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
- int prog_fd, struct bpf_prog *prog, __u32 flags)
-{
- struct bpf_link_primer link_primer;
- struct hid_bpf_link *link;
- struct hid_bpf_prog_entry *prog_entry;
- int cnt, err = -EINVAL, prog_table_idx = -1;
-
- mutex_lock(&hid_bpf_attach_lock);
-
- link = kzalloc(sizeof(*link), GFP_USER);
- if (!link) {
- err = -ENOMEM;
- goto err_unlock;
- }
-
- bpf_link_init(&link->link, BPF_LINK_TYPE_UNSPEC,
- &hid_bpf_link_lops, prog);
-
- /* do not attach too many programs to a given HID device */
- cnt = hid_bpf_program_count(hdev, NULL, prog_type);
- if (cnt < 0) {
- err = cnt;
- goto err_unlock;
- }
-
- if (cnt >= hid_bpf_max_programs(prog_type)) {
- err = -E2BIG;
- goto err_unlock;
- }
-
- prog_table_idx = hid_bpf_insert_prog(prog_fd, prog);
- /* if the jmp table is full, abort */
- if (prog_table_idx < 0) {
- err = prog_table_idx;
- goto err_unlock;
- }
-
- if (flags & HID_BPF_FLAG_INSERT_HEAD) {
- /* take the previous prog_entry slot */
- jmp_table.tail = PREV(jmp_table.tail);
- prog_entry = &jmp_table.entries[jmp_table.tail];
- } else {
- /* take the next prog_entry slot */
- prog_entry = &jmp_table.entries[jmp_table.head];
- jmp_table.head = NEXT(jmp_table.head);
- }
-
- /* we steal the ref here */
- prog_entry->prog = prog;
- prog_entry->idx = prog_table_idx;
- prog_entry->hdev = hdev;
- prog_entry->type = prog_type;
-
- /* finally store the index in the device list */
- err = hid_bpf_populate_hdev(hdev, prog_type);
- if (err) {
- hid_bpf_release_prog_at(prog_table_idx);
- goto err_unlock;
- }
-
- link->hid_table_index = prog_table_idx;
-
- err = bpf_link_prime(&link->link, &link_primer);
- if (err)
- goto err_unlock;
-
- mutex_unlock(&hid_bpf_attach_lock);
-
- return bpf_link_settle(&link_primer);
-
- err_unlock:
- mutex_unlock(&hid_bpf_attach_lock);
-
- kfree(link);
-
- return err;
-}
-
-void __hid_bpf_destroy_device(struct hid_device *hdev)
-{
- int type, i;
- struct hid_bpf_prog_list *prog_list;
-
- rcu_read_lock();
-
- for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
- prog_list = rcu_dereference(hdev->bpf.progs[type]);
-
- if (!prog_list)
- continue;
-
- for (i = 0; i < prog_list->prog_cnt; i++)
- __clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
- }
-
- rcu_read_unlock();
-
- for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
- __hid_bpf_set_hdev_progs(hdev, NULL, type);
-
- /* schedule release of all detached progs */
- schedule_work(&release_work);
-}
-
-#define HID_BPF_PROGS_COUNT 1
-
-static struct bpf_link *links[HID_BPF_PROGS_COUNT];
-static struct entrypoints_bpf *skel;
-
-void hid_bpf_free_links_and_skel(void)
-{
- int i;
-
- /* the following is enough to release all programs attached to hid */
- if (jmp_table.map)
- bpf_map_put_with_uref(jmp_table.map);
-
- for (i = 0; i < ARRAY_SIZE(links); i++) {
- if (!IS_ERR_OR_NULL(links[i]))
- bpf_link_put(links[i]);
- }
- entrypoints_bpf__destroy(skel);
-}
-
-#define ATTACH_AND_STORE_LINK(__name) do { \
- err = entrypoints_bpf__##__name##__attach(skel); \
- if (err) \
- goto out; \
- \
- links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd); \
- if (IS_ERR(links[idx])) { \
- err = PTR_ERR(links[idx]); \
- goto out; \
- } \
- \
- /* Avoid taking over stdin/stdout/stderr of init process. Zeroing out \
- * makes skel_closenz() a no-op later in iterators_bpf__destroy(). \
- */ \
- close_fd(skel->links.__name##_fd); \
- skel->links.__name##_fd = 0; \
- idx++; \
-} while (0)
-
-int hid_bpf_preload_skel(void)
-{
- int err, idx = 0;
-
- skel = entrypoints_bpf__open();
- if (!skel)
- return -ENOMEM;
-
- err = entrypoints_bpf__load(skel);
- if (err)
- goto out;
-
- jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
- if (IS_ERR(jmp_table.map)) {
- err = PTR_ERR(jmp_table.map);
- goto out;
- }
-
- ATTACH_AND_STORE_LINK(hid_tail_call);
-
- return 0;
-out:
- hid_bpf_free_links_and_skel();
- return err;
-}
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 96495e977204..c0682db73aeb 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -4,7 +4,7 @@
#define __HID_BPF_H
#include <linux/bpf.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
#include <uapi/linux/hid.h>
struct hid_device;
@@ -24,11 +24,7 @@ struct hid_device;
*
* All of these fields are currently read-only.
*
- * @index: program index in the jump table. No special meaning (a smaller index
- * doesn't mean the program will be executed before another program with
- * a bigger index).
* @hid: the ``struct hid_device`` representing the device itself
- * @report_type: used for ``hid_bpf_device_event()``
* @allocated_size: Allocated size of data.
*
* This is how much memory is available and can be requested
@@ -47,10 +43,8 @@ struct hid_device;
* @retval: Return value of the previous program.
*/
struct hid_bpf_ctx {
- __u32 index;
const struct hid_device *hid;
__u32 allocated_size;
- enum hid_report_type report_type;
union {
__s32 retval;
__s32 size;
@@ -74,27 +68,13 @@ enum hid_bpf_attach_flags {
HID_BPF_FLAG_MAX,
};
-/* Following functions are tracepoints that BPF programs can attach to */
-int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
-int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx);
-
/*
* Below is HID internal
*/
-/* internal function to call eBPF programs, not to be used by anybody */
-int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx);
-
#define HID_BPF_MAX_PROGS_PER_DEV 64
#define HID_BPF_FLAG_MASK (((HID_BPF_FLAG_MAX - 1) << 1) - 1)
-/* types of HID programs to attach to */
-enum hid_bpf_prog_type {
- HID_BPF_PROG_TYPE_UNDEF = -1,
- HID_BPF_PROG_TYPE_DEVICE_EVENT, /* an event is emitted from the device */
- HID_BPF_PROG_TYPE_RDESC_FIXUP,
- HID_BPF_PROG_TYPE_MAX,
-};
struct hid_report_enum;
@@ -170,11 +150,6 @@ struct hid_bpf_ops {
struct hid_device *hdev;
} ____cacheline_aligned_in_smp;
-struct hid_bpf_prog_list {
- u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
- u8 prog_cnt;
-};
-
/* stored in each device */
struct hid_bpf {
u8 *device_data; /* allocated when a bpf program of type
@@ -182,23 +157,13 @@ struct hid_bpf {
* to this HID device
*/
u32 allocated_data;
-
- struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX]; /* attached BPF progs */
bool destroyed; /* prevents the assignment of any progs */
- spinlock_t progs_lock; /* protects RCU update of progs */
-
struct hid_bpf_ops *rdesc_ops;
struct list_head prog_list;
struct mutex prog_list_lock; /* protects RCU update of prog_list */
};
-/* specific HID-BPF link when a program is attached to a device */
-struct hid_bpf_link {
- struct bpf_link link;
- int hid_table_index;
-};
-
#ifdef CONFIG_HID_BPF
u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
u32 *size, int interrupt);
--
2.44.0
^ permalink raw reply related
* [PATCH HID 07/13] HID: bpf: convert in-tree fixes into struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
Very mechanical:
- Change HID_BPF_DEVICE_EVENT and HID_BPF_RDESC_FIXUP #defines
- add a matching SEC(".struct_ops.link")
- in ArtistPro16Gen2 make the 2 functions static and have a new one
calling them
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c | 5 +++++
drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c | 4 ++++
drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c | 5 +++++
.../hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c | 4 ++++
.../hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c | 4 ++++
drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c | 4 ++++
drivers/hid/bpf/progs/XPPen__Artist24.bpf.c | 5 +++++
drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c | 22 ++++++++++++++++++----
drivers/hid/bpf/progs/hid_bpf.h | 6 ++++--
9 files changed, 53 insertions(+), 6 deletions(-)
diff --git a/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c b/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
index 2c2c1637ade8..caec91391d32 100644
--- a/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
+++ b/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
@@ -168,6 +168,11 @@ int BPF_PROG(raptor_mach_2_fix_hat_switch, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(raptor_mach_2) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc_raptor_mach_2,
+ .hid_device_event = (void *)raptor_mach_2_fix_hat_switch,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
index 17fc55f6f02c..c2413fa80543 100644
--- a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
+++ b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
@@ -45,6 +45,10 @@ int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(hp_elite_presenter) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c b/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
index 24b8a5aa05f3..a4a4f324aedd 100644
--- a/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
+++ b/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
@@ -255,6 +255,11 @@ int BPF_PROG(kamvas_pro_19_fix_3rd_button, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(huion_Kamvas_pro_19) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc_huion_kamvas_pro_19,
+ .hid_device_event = (void *)kamvas_pro_19_fix_3rd_button,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
index bee37872ee8c..82f1950445dd 100644
--- a/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
+++ b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
@@ -45,6 +45,10 @@ int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(iogear_kaliber_momentum) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c b/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
index f9ad33f4a373..70b16edfb59a 100644
--- a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
+++ b/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
@@ -114,6 +114,10 @@ int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(xbox_elite_2) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c b/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
index 39d77c5e9172..2da680bc4e11 100644
--- a/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
+++ b/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
@@ -139,6 +139,10 @@ int BPF_PROG(artpen_pressure_interpolate, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(wacom_artpen) = {
+ .hid_device_event = (void *)artpen_pressure_interpolate,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
index c938808bd589..bc0b85c38445 100644
--- a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
+++ b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
@@ -209,6 +209,11 @@ int BPF_PROG(xppen_24_fix_eraser, struct hid_bpf_ctx *hctx)
return 0;
}
+HID_BPF_OPS(xppen_artist_24) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc_xppen_artist24,
+ .hid_device_event = (void *)xppen_24_fix_eraser,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c b/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
index 77ef8b95d52e..a669525691aa 100644
--- a/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
+++ b/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
@@ -105,8 +105,7 @@ int BPF_PROG(hid_fix_rdesc_xppen_artistpro16gen2, struct hid_bpf_ctx *hctx)
return sizeof(fixed_rdesc);
}
-SEC(HID_BPF_DEVICE_EVENT)
-int BPF_PROG(xppen_16_fix_eraser, struct hid_bpf_ctx *hctx)
+static int xppen_16_fix_eraser(struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
@@ -207,8 +206,7 @@ static void compensate_coordinates_by_tilt(__u8 *data, const __u8 idx,
data[idx+1] = coords >> 8;
}
-SEC(HID_BPF_DEVICE_EVENT)
-int BPF_PROG(xppen_16_fix_angle_offset, struct hid_bpf_ctx *hctx)
+static int xppen_16_fix_angle_offset(struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
@@ -254,6 +252,22 @@ int BPF_PROG(xppen_16_fix_angle_offset, struct hid_bpf_ctx *hctx)
return 0;
}
+SEC(HID_BPF_DEVICE_EVENT)
+int BPF_PROG(xppen_artist_pro_16_device_event, struct hid_bpf_ctx *hctx)
+{
+ int ret = xppen_16_fix_angle_offset(hctx);
+
+ if (ret)
+ return ret;
+
+ return xppen_16_fix_eraser(hctx);
+}
+
+HID_BPF_OPS(xppen_artist_pro_16) = {
+ .hid_rdesc_fixup = (void *)hid_fix_rdesc_xppen_artistpro16gen2,
+ .hid_device_event = (void *)xppen_artist_pro_16_device_event,
+};
+
SEC("syscall")
int probe(struct hid_bpf_probe_args *ctx)
{
diff --git a/drivers/hid/bpf/progs/hid_bpf.h b/drivers/hid/bpf/progs/hid_bpf.h
index 1970faf84310..8c1cd9e25bc3 100644
--- a/drivers/hid/bpf/progs/hid_bpf.h
+++ b/drivers/hid/bpf/progs/hid_bpf.h
@@ -5,8 +5,10 @@
#ifndef ____HID_BPF__H
#define ____HID_BPF__H
-#define HID_BPF_DEVICE_EVENT "fmod_ret/hid_bpf_device_event"
-#define HID_BPF_RDESC_FIXUP "fmod_ret/hid_bpf_rdesc_fixup"
+#define HID_BPF_DEVICE_EVENT "struct_ops/hid_device_event"
+#define HID_BPF_RDESC_FIXUP "struct_ops/hid_rdesc_fixup"
+#define HID_BPF_OPS(name) SEC(".struct_ops.link") \
+ struct hid_bpf_ops name
struct hid_bpf_probe_args {
unsigned int hid;
--
2.44.0
^ permalink raw reply related
* [PATCH HID 06/13] HID: bpf: add defines for HID-BPF SEC in in-tree bpf fixes
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
We are going to switch over struct_ops, so instead of having to manually
replace all fields one by one, let's have a common place to change it.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c | 4 ++--
drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c | 2 +-
drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c | 4 ++--
drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c | 2 +-
drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c | 2 +-
drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c | 2 +-
drivers/hid/bpf/progs/XPPen__Artist24.bpf.c | 4 ++--
drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c | 6 +++---
drivers/hid/bpf/progs/hid_bpf.h | 3 +++
9 files changed, 16 insertions(+), 13 deletions(-)
diff --git a/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c b/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
index dc26a7677d36..2c2c1637ade8 100644
--- a/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
+++ b/drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c
@@ -133,7 +133,7 @@ HID_BPF_CONFIG(
* integer. We thus divide it by 30 to match what other joysticks are
* doing
*/
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc_raptor_mach_2, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, HID_MAX_DESCRIPTOR_SIZE /* size */);
@@ -152,7 +152,7 @@ int BPF_PROG(hid_fix_rdesc_raptor_mach_2, struct hid_bpf_ctx *hctx)
* divide it by 30.
* Byte 34 is always null, so it is ignored.
*/
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(raptor_mach_2_fix_hat_switch, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 64 /* size */);
diff --git a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
index 3d14bbb6f276..17fc55f6f02c 100644
--- a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
+++ b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
@@ -30,7 +30,7 @@ HID_BPF_CONFIG(
* pointer.
*/
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
diff --git a/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c b/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
index ff759f2276f9..24b8a5aa05f3 100644
--- a/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
+++ b/drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c
@@ -191,7 +191,7 @@ static const __u8 fixed_rdesc[] = {
0xc0, // End Collection 327
};
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc_huion_kamvas_pro_19, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, HID_MAX_DESCRIPTOR_SIZE /* size */);
@@ -215,7 +215,7 @@ int BPF_PROG(hid_fix_rdesc_huion_kamvas_pro_19, struct hid_bpf_ctx *hctx)
* - if there was this out-of-proximity event, we are entering
* eraser mode, and we will until the next out-of-proximity.
*/
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(kamvas_pro_19_fix_3rd_button, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
diff --git a/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
index 225cbefdbf0e..bee37872ee8c 100644
--- a/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
+++ b/drivers/hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c
@@ -21,7 +21,7 @@ HID_BPF_CONFIG(
* We just fix the report descriptor to enable those missing 7 buttons.
*/
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
{
const u8 offsets[] = {84, 112, 140};
diff --git a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c b/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
index c04abecab8ee..f9ad33f4a373 100644
--- a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
+++ b/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c
@@ -93,7 +93,7 @@ _Static_assert(sizeof(rdesc_assign_selection) == sizeof(fixed_rdesc_assign_selec
_Static_assert(sizeof(rdesc_assign_selection) + OFFSET_ASSIGN_SELECTION < ORIGINAL_RDESC_SIZE,
"Rdesc at given offset is too big");
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
diff --git a/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c b/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
index dc05aa48faa7..39d77c5e9172 100644
--- a/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
+++ b/drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c
@@ -101,7 +101,7 @@ static inline __u8 *get_u8(__u8 *data, unsigned int offset)
return (__u8 *)get_bits(data, offset);
}
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(artpen_pressure_interpolate, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, PEN_REPORT_LEN /* size */);
diff --git a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
index e1be6a12bb75..c938808bd589 100644
--- a/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
+++ b/drivers/hid/bpf/progs/XPPen__Artist24.bpf.c
@@ -91,7 +91,7 @@ static const __u8 fixed_rdesc[] = {
#define U16(index) (data[index] | (data[index + 1] << 8))
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc_xppen_artist24, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
@@ -152,7 +152,7 @@ static __u8 prev_state = 0;
* E: TipSwitch InRange
*
*/
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(xppen_24_fix_eraser, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
diff --git a/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c b/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
index 65ef10036126..77ef8b95d52e 100644
--- a/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
+++ b/drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c
@@ -82,7 +82,7 @@ static const __u8 fixed_rdesc[] = {
0xc0, // End Collection 112
};
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC(HID_BPF_RDESC_FIXUP)
int BPF_PROG(hid_fix_rdesc_xppen_artistpro16gen2, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
@@ -105,7 +105,7 @@ int BPF_PROG(hid_fix_rdesc_xppen_artistpro16gen2, struct hid_bpf_ctx *hctx)
return sizeof(fixed_rdesc);
}
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(xppen_16_fix_eraser, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
@@ -207,7 +207,7 @@ static void compensate_coordinates_by_tilt(__u8 *data, const __u8 idx,
data[idx+1] = coords >> 8;
}
-SEC("fmod_ret/hid_bpf_device_event")
+SEC(HID_BPF_DEVICE_EVENT)
int BPF_PROG(xppen_16_fix_angle_offset, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */);
diff --git a/drivers/hid/bpf/progs/hid_bpf.h b/drivers/hid/bpf/progs/hid_bpf.h
index 7ee371cac2e1..1970faf84310 100644
--- a/drivers/hid/bpf/progs/hid_bpf.h
+++ b/drivers/hid/bpf/progs/hid_bpf.h
@@ -5,6 +5,9 @@
#ifndef ____HID_BPF__H
#define ____HID_BPF__H
+#define HID_BPF_DEVICE_EVENT "fmod_ret/hid_bpf_device_event"
+#define HID_BPF_RDESC_FIXUP "fmod_ret/hid_bpf_rdesc_fixup"
+
struct hid_bpf_probe_args {
unsigned int hid;
unsigned int rdesc_size;
--
2.44.0
^ permalink raw reply related
* [PATCH HID 05/13] HID: samples: convert the 2 HID-BPF samples into struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
hid_mouse is currently failing with bpf_printk() not available in
struct_ops program type.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
samples/hid/Makefile | 5 ++--
samples/hid/hid_bpf_attach.bpf.c | 18 -------------
samples/hid/hid_bpf_attach.h | 14 ----------
samples/hid/hid_mouse.bpf.c | 26 +++++++++++++++----
samples/hid/hid_mouse.c | 39 ++++++++--------------------
samples/hid/hid_surface_dial.bpf.c | 10 +++++--
samples/hid/hid_surface_dial.c | 53 +++++++++++---------------------------
7 files changed, 57 insertions(+), 108 deletions(-)
diff --git a/samples/hid/Makefile b/samples/hid/Makefile
index c128ccd49974..8ea59e9631a3 100644
--- a/samples/hid/Makefile
+++ b/samples/hid/Makefile
@@ -16,7 +16,6 @@ LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
-EXTRA_HEADERS := hid_bpf_attach.h
EXTRA_BPF_HEADERS := hid_bpf_helpers.h
hid_mouse-objs := hid_mouse.o
@@ -207,8 +206,8 @@ $(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h
LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h
clean-files += $(LINKED_SKELS)
-hid_mouse.skel.h-deps := hid_mouse.bpf.o hid_bpf_attach.bpf.o
-hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o hid_bpf_attach.bpf.o
+hid_mouse.skel.h-deps := hid_mouse.bpf.o
+hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
diff --git a/samples/hid/hid_bpf_attach.bpf.c b/samples/hid/hid_bpf_attach.bpf.c
deleted file mode 100644
index d4dce4ea7c6e..000000000000
--- a/samples/hid/hid_bpf_attach.bpf.c
+++ /dev/null
@@ -1,18 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2022 Benjamin Tissoires
- */
-
-#include "vmlinux.h"
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_tracing.h>
-#include "hid_bpf_attach.h"
-#include "hid_bpf_helpers.h"
-
-SEC("syscall")
-int attach_prog(struct attach_prog_args *ctx)
-{
- ctx->retval = hid_bpf_attach_prog(ctx->hid,
- ctx->prog_fd,
- 0);
- return 0;
-}
diff --git a/samples/hid/hid_bpf_attach.h b/samples/hid/hid_bpf_attach.h
deleted file mode 100644
index 35bb28b49264..000000000000
--- a/samples/hid/hid_bpf_attach.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2022 Benjamin Tissoires
- */
-
-#ifndef __HID_BPF_ATTACH_H
-#define __HID_BPF_ATTACH_H
-
-struct attach_prog_args {
- int prog_fd;
- unsigned int hid;
- int retval;
-};
-
-#endif /* __HID_BPF_ATTACH_H */
diff --git a/samples/hid/hid_mouse.bpf.c b/samples/hid/hid_mouse.bpf.c
index 7c8b453ccb16..bd901fa855c9 100644
--- a/samples/hid/hid_mouse.bpf.c
+++ b/samples/hid/hid_mouse.bpf.c
@@ -5,8 +5,7 @@
#include <bpf/bpf_tracing.h>
#include "hid_bpf_helpers.h"
-SEC("fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_y_event, struct hid_bpf_ctx *hctx)
+static int hid_y_event(struct hid_bpf_ctx *hctx)
{
s16 y;
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
@@ -51,8 +50,7 @@ int BPF_PROG(hid_y_event, struct hid_bpf_ctx *hctx)
return 0;
}
-SEC("fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_x_event, struct hid_bpf_ctx *hctx)
+static int hid_x_event(struct hid_bpf_ctx *hctx)
{
s16 x;
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
@@ -69,7 +67,19 @@ int BPF_PROG(hid_x_event, struct hid_bpf_ctx *hctx)
return 0;
}
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC("struct_ops/device_event")
+int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx, enum hid_report_type type)
+{
+ int ret = hid_y_event(hctx);
+
+ if (ret)
+ return ret;
+
+ return hid_x_event(hctx);
+}
+
+
+SEC("struct_ops/rdesc_fixup")
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
@@ -109,4 +119,10 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
return 0;
}
+SEC(".struct_ops.link")
+struct hid_bpf_ops mouse_invert = {
+ .rdesc_fixup = (void *)hid_rdesc_fixup,
+ .device_event = (void *)hid_event,
+};
+
char _license[] SEC("license") = "GPL";
diff --git a/samples/hid/hid_mouse.c b/samples/hid/hid_mouse.c
index 018f1185f203..4b80d4e4c154 100644
--- a/samples/hid/hid_mouse.c
+++ b/samples/hid/hid_mouse.c
@@ -29,7 +29,6 @@
#include <bpf/libbpf.h>
#include "hid_mouse.skel.h"
-#include "hid_bpf_attach.h"
static bool running = true;
@@ -76,18 +75,11 @@ static int get_hid_id(const char *path)
int main(int argc, char **argv)
{
struct hid_mouse *skel;
- struct bpf_program *prog;
+ struct bpf_link *link;
int err;
const char *optstr = "";
const char *sysfs_path;
- int opt, hid_id, attach_fd;
- struct attach_prog_args args = {
- .retval = -1,
- };
- DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
- .ctx_in = &args,
- .ctx_size_in = sizeof(args),
- );
+ int opt, hid_id;
while ((opt = getopt(argc, argv, optstr)) != -1) {
switch (opt) {
@@ -108,7 +100,7 @@ int main(int argc, char **argv)
return 1;
}
- skel = hid_mouse__open_and_load();
+ skel = hid_mouse__open();
if (!skel) {
fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
return -1;
@@ -120,27 +112,18 @@ int main(int argc, char **argv)
fprintf(stderr, "can not open HID device: %m\n");
return 1;
}
- args.hid = hid_id;
+ skel->struct_ops.mouse_invert->hid_id = hid_id;
- attach_fd = bpf_program__fd(skel->progs.attach_prog);
- if (attach_fd < 0) {
- fprintf(stderr, "can't locate attach prog: %m\n");
+ err = hid_mouse__load(skel);
+ if (err < 0) {
+ fprintf(stderr, "can not load HID-BPF program: %m\n");
return 1;
}
- bpf_object__for_each_program(prog, *skel->skeleton->obj) {
- /* ignore syscalls */
- if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
- continue;
-
- args.retval = -1;
- args.prog_fd = bpf_program__fd(prog);
- err = bpf_prog_test_run_opts(attach_fd, &tattr);
- if (err) {
- fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
- hid_id, err);
- return 1;
- }
+ link = bpf_map__attach_struct_ops(skel->maps.mouse_invert);
+ if (!link) {
+ fprintf(stderr, "can not attach HID-BPF program: %m\n");
+ return 1;
}
signal(SIGINT, int_exit);
diff --git a/samples/hid/hid_surface_dial.bpf.c b/samples/hid/hid_surface_dial.bpf.c
index 1f80478c0918..d8d0fb07391f 100644
--- a/samples/hid/hid_surface_dial.bpf.c
+++ b/samples/hid/hid_surface_dial.bpf.c
@@ -10,7 +10,7 @@
#define HID_UP_BUTTON 0x0009
#define HID_GD_WHEEL 0x0038
-SEC("fmod_ret/hid_bpf_device_event")
+SEC("struct_ops/device_event")
int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
@@ -101,7 +101,7 @@ int set_haptic(struct haptic_syscall_args *args)
}
/* Convert REL_DIAL into REL_WHEEL */
-SEC("fmod_ret/hid_bpf_rdesc_fixup")
+SEC("struct_ops/rdesc_fixup")
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
{
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
@@ -130,5 +130,11 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
return 0;
}
+SEC(".struct_ops.link")
+struct hid_bpf_ops surface_dial = {
+ .rdesc_fixup = (void *)hid_rdesc_fixup,
+ .device_event = (void *)hid_event,
+};
+
char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = 1;
diff --git a/samples/hid/hid_surface_dial.c b/samples/hid/hid_surface_dial.c
index 4bc97373a708..9dd363845a85 100644
--- a/samples/hid/hid_surface_dial.c
+++ b/samples/hid/hid_surface_dial.c
@@ -31,7 +31,6 @@
#include <bpf/libbpf.h>
#include "hid_surface_dial.skel.h"
-#include "hid_bpf_attach.h"
static bool running = true;
@@ -86,34 +85,6 @@ static int get_hid_id(const char *path)
return (int)strtol(str_id, NULL, 16);
}
-static int attach_prog(struct hid_surface_dial *skel, struct bpf_program *prog, int hid_id)
-{
- struct attach_prog_args args = {
- .hid = hid_id,
- .retval = -1,
- };
- int attach_fd, err;
- DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
- .ctx_in = &args,
- .ctx_size_in = sizeof(args),
- );
-
- attach_fd = bpf_program__fd(skel->progs.attach_prog);
- if (attach_fd < 0) {
- fprintf(stderr, "can't locate attach prog: %m\n");
- return 1;
- }
-
- args.prog_fd = bpf_program__fd(prog);
- err = bpf_prog_test_run_opts(attach_fd, &tattr);
- if (err) {
- fprintf(stderr, "can't attach prog to hid device %d: %m (err: %d)\n",
- hid_id, err);
- return 1;
- }
- return 0;
-}
-
static int set_haptic(struct hid_surface_dial *skel, int hid_id)
{
struct haptic_syscall_args args = {
@@ -144,10 +115,10 @@ static int set_haptic(struct hid_surface_dial *skel, int hid_id)
int main(int argc, char **argv)
{
struct hid_surface_dial *skel;
- struct bpf_program *prog;
const char *optstr = "r:";
+ struct bpf_link *link;
const char *sysfs_path;
- int opt, hid_id, resolution = 72;
+ int err, opt, hid_id, resolution = 72;
while ((opt = getopt(argc, argv, optstr)) != -1) {
switch (opt) {
@@ -189,7 +160,7 @@ int main(int argc, char **argv)
return 1;
}
- skel = hid_surface_dial__open_and_load();
+ skel = hid_surface_dial__open();
if (!skel) {
fprintf(stderr, "%s %s:%d", __func__, __FILE__, __LINE__);
return -1;
@@ -201,15 +172,21 @@ int main(int argc, char **argv)
return 1;
}
+ skel->struct_ops.surface_dial->hid_id = hid_id;
+
+ err = hid_surface_dial__load(skel);
+ if (err < 0) {
+ fprintf(stderr, "can not load HID-BPF program: %m\n");
+ return 1;
+ }
+
skel->data->resolution = resolution;
skel->data->physical = (int)(resolution / 72);
- bpf_object__for_each_program(prog, *skel->skeleton->obj) {
- /* ignore syscalls */
- if (bpf_program__get_type(prog) != BPF_PROG_TYPE_TRACING)
- continue;
-
- attach_prog(skel, prog, hid_id);
+ link = bpf_map__attach_struct_ops(skel->maps.surface_dial);
+ if (!link) {
+ fprintf(stderr, "can not attach HID-BPF program: %m\n");
+ return 1;
}
signal(SIGINT, int_exit);
--
2.44.0
^ permalink raw reply related
* [PATCH HID 04/13] selftests/hid: convert the hid_bpf selftests with struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
We drop the need for the attach() bpf syscall, but we need to set up
the hid_id field before calling __load().
The .bpf.c part is mechanical: we create one struct_ops per HID-BPF
program, as all the tests are for one program at a time.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
tools/testing/selftests/hid/hid_bpf.c | 59 +++++++++++++------------
tools/testing/selftests/hid/progs/hid.c | 76 +++++++++++++++++++++++----------
2 files changed, 85 insertions(+), 50 deletions(-)
diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftests/hid/hid_bpf.c
index f825623e3edc..967dfe6b58cb 100644
--- a/tools/testing/selftests/hid/hid_bpf.c
+++ b/tools/testing/selftests/hid/hid_bpf.c
@@ -460,7 +460,7 @@ FIXTURE(hid_bpf) {
int hid_id;
pthread_t tid;
struct hid *skel;
- int hid_links[3]; /* max number of programs loaded in a single test */
+ struct bpf_link *hid_links[3]; /* max number of programs loaded in a single test */
};
static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
{
@@ -472,7 +472,7 @@ static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
for (i = 0; i < ARRAY_SIZE(self->hid_links); i++) {
if (self->hid_links[i])
- close(self->hid_links[i]);
+ bpf_link__destroy(self->hid_links[i]);
}
hid__destroy(self->skel);
@@ -527,14 +527,7 @@ static void load_programs(const struct test_program programs[],
FIXTURE_DATA(hid_bpf) * self,
const FIXTURE_VARIANT(hid_bpf) * variant)
{
- int attach_fd, err = -EINVAL;
- struct attach_prog_args args = {
- .retval = -1,
- };
- DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
- .ctx_in = &args,
- .ctx_size_in = sizeof(args),
- );
+ int err = -EINVAL;
ASSERT_LE(progs_count, ARRAY_SIZE(self->hid_links))
TH_LOG("too many programs are to be loaded");
@@ -545,35 +538,41 @@ static void load_programs(const struct test_program programs[],
for (int i = 0; i < progs_count; i++) {
struct bpf_program *prog;
+ struct bpf_map *map;
+ int *ops_hid_id;
prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
programs[i].name);
ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
bpf_program__set_autoload(prog, true);
+
+ map = bpf_object__find_map_by_name(*self->skel->skeleton->obj,
+ programs[i].name + 4);
+ ASSERT_OK_PTR(map) TH_LOG("can not find struct_ops by name '%s'",
+ programs[i].name + 4);
+
+ /* hid_id is the first field of struct hid_bpf_ops */
+ ops_hid_id = bpf_map__initial_value(map, NULL);
+ ASSERT_OK_PTR(ops_hid_id) TH_LOG("unable to retrieve struct_ops data");
+
+ *ops_hid_id = self->hid_id;
}
err = hid__load(self->skel);
ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err);
- attach_fd = bpf_program__fd(self->skel->progs.attach_prog);
- ASSERT_GE(attach_fd, 0) TH_LOG("locate attach_prog: %d", attach_fd);
-
for (int i = 0; i < progs_count; i++) {
- struct bpf_program *prog;
+ struct bpf_map *map;
- prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
- programs[i].name);
- ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
-
- args.prog_fd = bpf_program__fd(prog);
- args.hid = self->hid_id;
- args.insert_head = programs[i].insert_head;
- err = bpf_prog_test_run_opts(attach_fd, &tattr);
- ASSERT_GE(args.retval, 0)
- TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
+ map = bpf_object__find_map_by_name(*self->skel->skeleton->obj,
+ programs[i].name + 4);
+ ASSERT_OK_PTR(map) TH_LOG("can not find struct_ops by name '%s'",
+ programs[i].name + 4);
- self->hid_links[i] = args.retval;
+ self->hid_links[i] = bpf_map__attach_struct_ops(map);
+ ASSERT_OK_PTR(self->hid_links[i]) TH_LOG("failed to attach struct ops '%s'",
+ programs[i].name + 4);
}
self->hidraw_fd = open_hidraw(self->dev_id);
@@ -648,13 +647,17 @@ TEST_F(hid_bpf, test_attach_detach)
{ .name = "hid_first_event" },
{ .name = "hid_second_event" },
};
+ struct bpf_link *link;
__u8 buf[10] = {0};
- int err, link;
+ int err, link_fd;
LOAD_PROGRAMS(progs);
link = self->hid_links[0];
- ASSERT_GT(link, 0) TH_LOG("HID-BPF link not created");
+ ASSERT_OK_PTR(link) TH_LOG("HID-BPF link not created");
+
+ link_fd = bpf_link__fd(link);
+ ASSERT_GE(link_fd, 0) TH_LOG("HID-BPF link FD not valid");
/* inject one event */
buf[0] = 1;
@@ -673,7 +676,7 @@ TEST_F(hid_bpf, test_attach_detach)
/* pin the first program and immediately unpin it */
#define PIN_PATH "/sys/fs/bpf/hid_first_event"
- err = bpf_obj_pin(link, PIN_PATH);
+ err = bpf_obj_pin(link_fd, PIN_PATH);
ASSERT_OK(err) TH_LOG("error while calling bpf_obj_pin");
remove(PIN_PATH);
#undef PIN_PATH
diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selftests/hid/progs/hid.c
index f67d35def142..9adace26e8aa 100644
--- a/tools/testing/selftests/hid/progs/hid.c
+++ b/tools/testing/selftests/hid/progs/hid.c
@@ -14,8 +14,8 @@ struct attach_prog_args {
__u64 callback_check = 52;
__u64 callback2_check = 52;
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
@@ -29,8 +29,14 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
return hid_ctx->size;
}
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx)
+SEC(".struct_ops.link")
+struct hid_bpf_ops first_event = {
+ .hid_device_event = (void *)hid_first_event,
+ .hid_id = 2,
+};
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
@@ -42,8 +48,13 @@ int BPF_PROG(hid_second_event, struct hid_bpf_ctx *hid_ctx)
return hid_ctx->size;
}
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx)
+SEC(".struct_ops.link")
+struct hid_bpf_ops second_event = {
+ .hid_device_event = (void *)hid_second_event,
+};
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
@@ -55,15 +66,10 @@ int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx)
return 9;
}
-SEC("syscall")
-int attach_prog(struct attach_prog_args *ctx)
-{
- ctx->retval = hid_bpf_attach_prog(ctx->hid,
- ctx->prog_fd,
- ctx->insert_head ? HID_BPF_FLAG_INSERT_HEAD :
- HID_BPF_FLAG_NONE);
- return 0;
-}
+SEC(".struct_ops.link")
+struct hid_bpf_ops change_report_id = {
+ .hid_device_event = (void *)hid_change_report_id,
+};
struct hid_hw_request_syscall_args {
/* data needs to come at offset 0 so we can use it in calls */
@@ -181,7 +187,12 @@ static const __u8 rdesc[] = {
0xc0, /* END_COLLECTION */
};
-SEC("?fmod_ret/hid_bpf_rdesc_fixup")
+/*
+ * the following program is marked as sleepable (struct_ops.s).
+ * This is not strictly mandatory but is a nice test for
+ * sleepable struct_ops
+ */
+SEC("?struct_ops.s/hid_rdesc_fixup")
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4096 /* size */);
@@ -200,8 +211,13 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
return sizeof(rdesc) + 73;
}
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx)
+SEC(".struct_ops.link")
+struct hid_bpf_ops rdesc_fixup = {
+ .hid_rdesc_fixup = (void *)hid_rdesc_fixup,
+};
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
@@ -217,8 +233,14 @@ int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx)
return 0;
}
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx)
+SEC(".struct_ops.link")
+struct hid_bpf_ops test_insert1 = {
+ .hid_device_event = (void *)hid_test_insert1,
+ .flags = HID_BPF_FLAG_INSERT_HEAD,
+};
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
@@ -234,8 +256,13 @@ int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx)
return 0;
}
-SEC("?fmod_ret/hid_bpf_device_event")
-int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx)
+SEC(".struct_ops.link")
+struct hid_bpf_ops test_insert2 = {
+ .hid_device_event = (void *)hid_test_insert2,
+};
+
+SEC("?struct_ops/hid_device_event")
+int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx, enum hid_report_type type)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
@@ -250,3 +277,8 @@ int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx)
return 0;
}
+
+SEC(".struct_ops.link")
+struct hid_bpf_ops test_insert3 = {
+ .hid_device_event = (void *)hid_test_insert3,
+};
--
2.44.0
^ permalink raw reply related
* [PATCH HID 03/13] HID: bpf: implement HID-BPF through bpf_struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
We do this implementation in several steps to not have the CI failing:
- first (this patch), we add struct_ops while keeping the existing infra
available
- then we change the selftests, the examples and the existing in-tree
HID-BPF programs
- then we remove the existing trace points making old HID-BPF obsolete
There are a few advantages of struct_ops over tracing:
- compatibility with sleepable programs (for hid_hw_raw_request() in
a later patch)
- a lot simpler in the kernel: it's a simple rcu protected list
- we can add more parameters to the function called without much trouble
- the "attach" is now generic through BPF-core: the caller just needs to
set hid_id and flags before calling __load().
- all the BPF tough part is not handled in BPF-core through generic
processing
- hid_bpf_ctx is now only writable where it needs be
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/Makefile | 2 +-
drivers/hid/bpf/hid_bpf_dispatch.c | 52 +++++++-
drivers/hid/bpf/hid_bpf_dispatch.h | 4 +
drivers/hid/bpf/hid_bpf_jmp_table.c | 3 +
drivers/hid/bpf/hid_bpf_struct_ops.c | 246 +++++++++++++++++++++++++++++++++++
include/linux/hid_bpf.h | 64 ++++++++-
6 files changed, 362 insertions(+), 9 deletions(-)
diff --git a/drivers/hid/bpf/Makefile b/drivers/hid/bpf/Makefile
index cf55120cf7d6..1cb3f31e9335 100644
--- a/drivers/hid/bpf/Makefile
+++ b/drivers/hid/bpf/Makefile
@@ -8,4 +8,4 @@ LIBBPF_INCLUDE = $(srctree)/tools/lib
obj-$(CONFIG_HID_BPF) += hid_bpf.o
CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)
CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)
-hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o
+hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o hid_bpf_struct_ops.o
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index c8bb79ce2354..7216c3c7713d 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -58,6 +58,7 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
},
.data = hdev->bpf.device_data,
};
+ struct hid_bpf_ops *e;
int ret;
if (type >= HID_REPORT_TYPES)
@@ -70,9 +71,25 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
memset(ctx_kern.data, 0, hdev->bpf.allocated_data);
memcpy(ctx_kern.data, data, *size);
+ rcu_read_lock();
+ list_for_each_entry_rcu(e, &hdev->bpf.prog_list, list) {
+ if (e->hid_device_event) {
+ ret = e->hid_device_event(&ctx_kern.ctx, type);
+ if (ret < 0) {
+ rcu_read_unlock();
+ return ERR_PTR(ret);
+ }
+
+ if (ret)
+ ctx_kern.ctx.retval = ret;
+ }
+ }
+ rcu_read_unlock();
+
ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
if (ret < 0)
return ERR_PTR(ret);
+ ret = ctx_kern.ctx.retval;
if (ret) {
if (ret > ctx_kern.ctx.allocated_size)
@@ -122,7 +139,10 @@ u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *s
memcpy(ctx_kern.data, rdesc, min_t(unsigned int, *size, HID_MAX_DESCRIPTOR_SIZE));
- ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
+ if (hdev->bpf.rdesc_ops)
+ ret = hdev->bpf.rdesc_ops->hid_rdesc_fixup(&ctx_kern.ctx);
+ else
+ ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
if (ret < 0)
goto ignore_bpf;
@@ -150,7 +170,7 @@ static int device_match_id(struct device *dev, const void *id)
return hdev->id == *(int *)id;
}
-static struct hid_device *hid_get_device(unsigned int hid_id)
+struct hid_device *hid_get_device(unsigned int hid_id)
{
struct device *dev;
@@ -164,7 +184,7 @@ static struct hid_device *hid_get_device(unsigned int hid_id)
return to_hid_device(dev);
}
-static void hid_put_device(struct hid_device *hid)
+void hid_put_device(struct hid_device *hid)
{
put_device(&hid->dev);
}
@@ -205,7 +225,7 @@ static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size
return 0;
}
-static int hid_bpf_allocate_event_data(struct hid_device *hdev)
+int hid_bpf_allocate_event_data(struct hid_device *hdev)
{
/* hdev->bpf.device_data is already allocated, abort */
if (hdev->bpf.device_data)
@@ -592,14 +612,22 @@ static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
int hid_bpf_connect_device(struct hid_device *hdev)
{
- struct hid_bpf_prog_list *prog_list;
+ bool need_to_allocate = false;
+ struct hid_bpf_ops *e;
rcu_read_lock();
- prog_list = rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]);
+ list_for_each_entry_rcu(e, &hdev->bpf.prog_list, list) {
+ if (e->hid_device_event) {
+ need_to_allocate = true;
+ break;
+ }
+ }
+ if (rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]))
+ need_to_allocate = true;
rcu_read_unlock();
/* only allocate BPF data if there are programs attached */
- if (!prog_list)
+ if (!need_to_allocate)
return 0;
return hid_bpf_allocate_event_data(hdev);
@@ -623,12 +651,15 @@ void hid_bpf_destroy_device(struct hid_device *hdev)
hdev->bpf.destroyed = true;
__hid_bpf_destroy_device(hdev);
+ __hid_bpf_ops_destroy_device(hdev);
}
EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
void hid_bpf_device_init(struct hid_device *hdev)
{
spin_lock_init(&hdev->bpf.progs_lock);
+ INIT_LIST_HEAD(&hdev->bpf.prog_list);
+ mutex_init(&hdev->bpf.prog_list_lock);
}
EXPORT_SYMBOL_GPL(hid_bpf_device_init);
@@ -662,6 +693,13 @@ static int __init hid_bpf_init(void)
return 0;
}
+ /* register struct_ops kfuncs after we are sure we can load our preloaded bpf program */
+ err = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &hid_bpf_kfunc_set);
+ if (err) {
+ pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+ return 0;
+ }
+
/* register syscalls after we are sure we can load our preloaded bpf program */
err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
if (err) {
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index fbe0639d09f2..e52c43d81650 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -10,12 +10,16 @@ struct hid_bpf_ctx_kern {
u8 *data;
};
+struct hid_device *hid_get_device(unsigned int hid_id);
+void hid_put_device(struct hid_device *hid);
+int hid_bpf_allocate_event_data(struct hid_device *hdev);
int hid_bpf_preload_skel(void);
void hid_bpf_free_links_and_skel(void);
int hid_bpf_get_prog_attach_type(struct bpf_prog *prog);
int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd,
struct bpf_prog *prog, __u32 flags);
void __hid_bpf_destroy_device(struct hid_device *hdev);
+void __hid_bpf_ops_destroy_device(struct hid_device *hdev);
int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
struct hid_bpf_ctx_kern *ctx_kern);
int hid_bpf_reconnect(struct hid_device *hdev);
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index aa8e1c79cdf5..8a54ba447718 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -81,6 +81,9 @@ static int hid_bpf_program_count(struct hid_device *hdev,
if (type >= HID_BPF_PROG_TYPE_MAX)
return -EINVAL;
+ if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP && hdev->bpf.rdesc_ops)
+ n += 1;
+
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf_struct_ops.c
new file mode 100644
index 000000000000..be514a98e55b
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_struct_ops.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * HID-BPF support for Linux
+ *
+ * Copyright (c) 2024 Benjamin Tissoires
+ */
+
+#include <linux/bitops.h>
+#include <linux/bpf_verifier.h>
+#include <linux/bpf.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+
+static struct btf *hid_bpf_ops_btf;
+
+static int hid_bpf_ops_init(struct btf *btf)
+{
+ hid_bpf_ops_btf = btf;
+ return 0;
+}
+
+static bool hid_bpf_ops_is_valid_access(int off, int size,
+ enum bpf_access_type type,
+ const struct bpf_prog *prog,
+ struct bpf_insn_access_aux *info)
+{
+ return bpf_tracing_btf_ctx_access(off, size, type, prog, info);
+}
+
+static int hid_bpf_ops_check_member(const struct btf_type *t,
+ const struct btf_member *member,
+ const struct bpf_prog *prog)
+{
+ u32 moff = __btf_member_bit_offset(t, member) / 8;
+
+ switch (moff) {
+ case offsetof(struct hid_bpf_ops, hid_rdesc_fixup):
+ break;
+ default:
+ if (prog->sleepable)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int hid_bpf_ops_btf_struct_access(struct bpf_verifier_log *log,
+ const struct bpf_reg_state *reg,
+ int off, int size)
+{
+ const struct btf_type *state;
+ const struct btf_type *t;
+ s32 type_id;
+
+ type_id = btf_find_by_name_kind(reg->btf, "hid_bpf_ctx",
+ BTF_KIND_STRUCT);
+ if (type_id < 0)
+ return -EINVAL;
+
+ t = btf_type_by_id(reg->btf, reg->btf_id);
+ state = btf_type_by_id(reg->btf, type_id);
+ if (t != state) {
+ bpf_log(log, "only access to hid_bpf_ctx is supported\n");
+ return -EACCES;
+ }
+
+ /* out-of-bound access in hid_bpf_ctx */
+ if (off + size > sizeof(struct hid_bpf_ctx)) {
+ bpf_log(log, "write access at off %d with size %d\n", off, size);
+ return -EACCES;
+ }
+
+ if (off < offsetof(struct hid_bpf_ctx, retval)) {
+ bpf_log(log,
+ "write access at off %d with size %d on read-only part of hid_bpf_ctx\n",
+ off, size);
+ return -EACCES;
+ }
+
+ return NOT_INIT;
+}
+
+static const struct bpf_verifier_ops hid_bpf_verifier_ops = {
+ .is_valid_access = hid_bpf_ops_is_valid_access,
+ .btf_struct_access = hid_bpf_ops_btf_struct_access,
+};
+
+static int hid_bpf_ops_init_member(const struct btf_type *t,
+ const struct btf_member *member,
+ void *kdata, const void *udata)
+{
+ u32 flags;
+
+ switch (member->offset) {
+ case offsetof(struct hid_bpf_ops, hid_id) * 8:
+ /* For hid_id and flags fields, this function has to copy it
+ * and return 1 to indicate that the data has been handled by
+ * the struct_ops type, or the verifier will reject the map if
+ * the value of those fields is not zero.
+ */
+ ((struct hid_bpf_ops *)kdata)->hid_id = ((struct hid_bpf_ops *)udata)->hid_id;
+ return 1;
+ case offsetof(struct hid_bpf_ops, flags) * 8:
+ flags = ((struct hid_bpf_ops *)udata)->flags;
+ if (flags & ~HID_BPF_FLAG_MASK)
+ return -EINVAL;
+ ((struct hid_bpf_ops *)kdata)->flags = flags;
+ return 1;
+ }
+ return 0;
+}
+
+static int hid_bpf_reg(void *kdata)
+{
+ struct hid_bpf_ops *ops = kdata;
+ struct hid_device *hdev;
+ int count, err = 0;
+
+ hdev = hid_get_device(ops->hid_id);
+ if (IS_ERR(hdev))
+ return PTR_ERR(hdev);
+
+ ops->hdev = hdev;
+
+ mutex_lock(&hdev->bpf.prog_list_lock);
+
+ count = list_count_nodes(&hdev->bpf.prog_list);
+ if (count >= HID_BPF_MAX_PROGS_PER_DEV) {
+ err = -E2BIG;
+ goto out_unlock;
+ }
+
+ if (ops->hid_rdesc_fixup) {
+ if (hdev->bpf.rdesc_ops) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
+ hdev->bpf.rdesc_ops = ops;
+ }
+
+ if (ops->hid_device_event) {
+ err = hid_bpf_allocate_event_data(hdev);
+ if (err)
+ goto out_unlock;
+ }
+
+ if (ops->flags & HID_BPF_FLAG_INSERT_HEAD)
+ list_add_rcu(&ops->list, &hdev->bpf.prog_list);
+ else
+ list_add_tail_rcu(&ops->list, &hdev->bpf.prog_list);
+
+out_unlock:
+ mutex_unlock(&hdev->bpf.prog_list_lock);
+
+ if (err) {
+ if (hdev->bpf.rdesc_ops == ops)
+ hdev->bpf.rdesc_ops = NULL;
+ hid_put_device(hdev);
+ } else if (ops->hid_rdesc_fixup) {
+ hid_bpf_reconnect(hdev);
+ }
+
+ return err;
+}
+
+static void hid_bpf_unreg(void *kdata)
+{
+ struct hid_bpf_ops *ops = kdata;
+ struct hid_device *hdev;
+ bool reconnect = false;
+
+ hdev = ops->hdev;
+
+ /* check if __hid_bpf_ops_destroy_device() has been called */
+ if (!hdev)
+ return;
+
+ mutex_lock(&hdev->bpf.prog_list_lock);
+
+ list_del_rcu(&ops->list);
+
+ reconnect = hdev->bpf.rdesc_ops == ops;
+ if (reconnect)
+ hdev->bpf.rdesc_ops = NULL;
+
+ mutex_unlock(&hdev->bpf.prog_list_lock);
+
+ if (reconnect)
+ hid_bpf_reconnect(hdev);
+
+ hid_put_device(hdev);
+}
+
+static int __hid_bpf_device_event(struct hid_bpf_ctx *ctx, enum hid_report_type type)
+{
+ return 0;
+}
+
+static int __hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
+{
+ return 0;
+}
+
+static struct hid_bpf_ops __bpf_hid_bpf_ops = {
+ .hid_device_event = __hid_bpf_device_event,
+ .hid_rdesc_fixup = __hid_bpf_rdesc_fixup,
+};
+
+static struct bpf_struct_ops bpf_hid_bpf_ops = {
+ .verifier_ops = &hid_bpf_verifier_ops,
+ .init = hid_bpf_ops_init,
+ .check_member = hid_bpf_ops_check_member,
+ .init_member = hid_bpf_ops_init_member,
+ .reg = hid_bpf_reg,
+ .unreg = hid_bpf_unreg,
+ .name = "hid_bpf_ops",
+ .cfi_stubs = &__bpf_hid_bpf_ops,
+ .owner = THIS_MODULE,
+};
+
+void __hid_bpf_ops_destroy_device(struct hid_device *hdev)
+{
+ struct hid_bpf_ops *e;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(e, &hdev->bpf.prog_list, list) {
+ hid_put_device(hdev);
+ e->hdev = NULL;
+ }
+ rcu_read_unlock();
+}
+
+static int __init hid_bpf_struct_ops_init(void)
+{
+ return register_bpf_struct_ops(&bpf_hid_bpf_ops, hid_bpf_ops);
+}
+late_initcall(hid_bpf_struct_ops_init);
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index a66103618e6e..96495e977204 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -65,11 +65,12 @@ struct hid_bpf_ctx {
* @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program
* currently attached to the device. This doesn't
* guarantee that this program will always be first
- * @HID_BPF_FLAG_MAX: sentinel value, not to be used by the callers
*/
enum hid_bpf_attach_flags {
HID_BPF_FLAG_NONE = 0,
HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
+
+ /* private: internal use only */
HID_BPF_FLAG_MAX,
};
@@ -112,6 +113,63 @@ struct hid_ops {
extern struct hid_ops *hid_ops;
+/**
+ * struct hid_bpf_ops - A BPF struct_ops of callbacks allowing to attach HID-BPF
+ * programs to a HID device
+ * @hid_id: the HID uniq ID to attach to. This is writeable before ``load()``, and
+ * cannot be changed after
+ * @flags: &enum hid_bpf_attach_flags to assign flags before ``load()``.
+ * Writeable only before ``load()``
+ */
+struct hid_bpf_ops {
+ /* hid_id needs to stay first so we can easily change it
+ * from userspace.
+ */
+ int hid_id;
+ u32 flags;
+
+ /* private: internal use only */
+ struct list_head list;
+
+ /* public: rest is public */
+
+/* fast path fields are put first to fill one cache line */
+
+ /**
+ * @hid_device_event: called whenever an event is coming in from the device
+ *
+ * It has the following arguments:
+ *
+ * ``ctx``: The HID-BPF context as &struct hid_bpf_ctx
+ *
+ * Return: %0 on success and keep processing; a positive
+ * value to change the incoming size buffer; a negative
+ * error code to interrupt the processing of this event
+ *
+ * Context: Interrupt context.
+ */
+ int (*hid_device_event)(struct hid_bpf_ctx *ctx, enum hid_report_type report_type);
+
+/* control/slow paths put last */
+
+ /**
+ * @hid_rdesc_fixup: called when the probe function parses the report descriptor
+ * of the HID device
+ *
+ * It has the following arguments:
+ *
+ * ``ctx``: The HID-BPF context as &struct hid_bpf_ctx
+ *
+ * Return: %0 on success and keep processing; a positive
+ * value to change the incoming size buffer; a negative
+ * error code to interrupt the processing of this device
+ */
+ int (*hid_rdesc_fixup)(struct hid_bpf_ctx *ctx);
+
+ /* private: internal use only */
+ struct hid_device *hdev;
+} ____cacheline_aligned_in_smp;
+
struct hid_bpf_prog_list {
u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
u8 prog_cnt;
@@ -129,6 +187,10 @@ struct hid_bpf {
bool destroyed; /* prevents the assignment of any progs */
spinlock_t progs_lock; /* protects RCU update of progs */
+
+ struct hid_bpf_ops *rdesc_ops;
+ struct list_head prog_list;
+ struct mutex prog_list_lock; /* protects RCU update of prog_list */
};
/* specific HID-BPF link when a program is attached to a device */
--
2.44.0
^ permalink raw reply related
* [PATCH HID 02/13] HID: bpf: add hid_get/put_device() helpers
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
no code change, but this way we reduce code duplication and we
can export it later.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/hid_bpf_dispatch.c | 47 ++++++++++++++++++++++----------------
1 file changed, 27 insertions(+), 20 deletions(-)
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 55c9f82fdef0..c8bb79ce2354 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -150,6 +150,25 @@ static int device_match_id(struct device *dev, const void *id)
return hdev->id == *(int *)id;
}
+static struct hid_device *hid_get_device(unsigned int hid_id)
+{
+ struct device *dev;
+
+ if (!hid_ops)
+ return ERR_PTR(-EINVAL);
+
+ dev = bus_find_device(hid_ops->bus_type, NULL, &hid_id, device_match_id);
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
+ return to_hid_device(dev);
+}
+
+static void hid_put_device(struct hid_device *hid)
+{
+ put_device(&hid->dev);
+}
+
static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size)
{
u8 *alloc_data;
@@ -281,20 +300,14 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
{
struct hid_device *hdev;
struct bpf_prog *prog;
- struct device *dev;
int err, fd;
- if (!hid_ops)
- return -EINVAL;
-
if ((flags & ~HID_BPF_FLAG_MASK))
return -EINVAL;
- dev = bus_find_device(hid_ops->bus_type, NULL, &hid_id, device_match_id);
- if (!dev)
- return -EINVAL;
-
- hdev = to_hid_device(dev);
+ hdev = hid_get_device(hid_id);
+ if (IS_ERR(hdev))
+ return PTR_ERR(hdev);
/*
* take a ref on the prog itself, it will be released
@@ -317,7 +330,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
out_prog_put:
bpf_prog_put(prog);
out_dev_put:
- put_device(dev);
+ hid_put_device(hdev);
return err;
}
@@ -333,20 +346,14 @@ hid_bpf_allocate_context(unsigned int hid_id)
{
struct hid_device *hdev;
struct hid_bpf_ctx_kern *ctx_kern = NULL;
- struct device *dev;
-
- if (!hid_ops)
- return NULL;
- dev = bus_find_device(hid_ops->bus_type, NULL, &hid_id, device_match_id);
- if (!dev)
+ hdev = hid_get_device(hid_id);
+ if (IS_ERR(hdev))
return NULL;
- hdev = to_hid_device(dev);
-
ctx_kern = kzalloc(sizeof(*ctx_kern), GFP_KERNEL);
if (!ctx_kern) {
- put_device(dev);
+ hid_put_device(hdev);
return NULL;
}
@@ -373,7 +380,7 @@ hid_bpf_release_context(struct hid_bpf_ctx *ctx)
kfree(ctx_kern);
/* get_device() is called by bus_find_device() */
- put_device(&hid->dev);
+ hid_put_device(hid);
}
static int
--
2.44.0
^ permalink raw reply related
* [PATCH HID 01/13] HID: rename struct hid_bpf_ops into hid_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires
In-Reply-To: <20240528-hid_bpf_struct_ops-v1-0-8c6663df27d8@kernel.org>
Those operations are the ones from HID, not HID-BPF, and I'd like to
reuse hid_bpf_ops as the user facing struct_ops API.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
drivers/hid/bpf/hid_bpf_dispatch.c | 22 +++++++++++-----------
drivers/hid/hid-core.c | 6 +++---
include/linux/hid_bpf.h | 4 ++--
3 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 10289f44d0cc..55c9f82fdef0 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -21,8 +21,8 @@
#include "hid_bpf_dispatch.h"
#include "entrypoints/entrypoints.lskel.h"
-struct hid_bpf_ops *hid_bpf_ops;
-EXPORT_SYMBOL(hid_bpf_ops);
+struct hid_ops *hid_ops;
+EXPORT_SYMBOL(hid_ops);
/**
* hid_bpf_device_event - Called whenever an event is coming in from the device
@@ -284,13 +284,13 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
struct device *dev;
int err, fd;
- if (!hid_bpf_ops)
+ if (!hid_ops)
return -EINVAL;
if ((flags & ~HID_BPF_FLAG_MASK))
return -EINVAL;
- dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+ dev = bus_find_device(hid_ops->bus_type, NULL, &hid_id, device_match_id);
if (!dev)
return -EINVAL;
@@ -335,10 +335,10 @@ hid_bpf_allocate_context(unsigned int hid_id)
struct hid_bpf_ctx_kern *ctx_kern = NULL;
struct device *dev;
- if (!hid_bpf_ops)
+ if (!hid_ops)
return NULL;
- dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+ dev = bus_find_device(hid_ops->bus_type, NULL, &hid_id, device_match_id);
if (!dev)
return NULL;
@@ -386,7 +386,7 @@ __hid_bpf_hw_check_params(struct hid_bpf_ctx *ctx, __u8 *buf, size_t *buf__sz,
u32 report_len;
/* check arguments */
- if (!ctx || !hid_bpf_ops || !buf)
+ if (!ctx || !hid_ops || !buf)
return -EINVAL;
switch (rtype) {
@@ -404,7 +404,7 @@ __hid_bpf_hw_check_params(struct hid_bpf_ctx *ctx, __u8 *buf, size_t *buf__sz,
hdev = (struct hid_device *)ctx->hid; /* discard const */
report_enum = hdev->report_enum + rtype;
- report = hid_bpf_ops->hid_get_report(report_enum, buf);
+ report = hid_ops->hid_get_report(report_enum, buf);
if (!report)
return -EINVAL;
@@ -459,7 +459,7 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
if (!dma_data)
return -ENOMEM;
- ret = hid_bpf_ops->hid_hw_raw_request(hdev,
+ ret = hid_ops->hid_hw_raw_request(hdev,
dma_data[0],
dma_data,
size,
@@ -501,7 +501,7 @@ hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz)
if (!dma_data)
return -ENOMEM;
- ret = hid_bpf_ops->hid_hw_output_report(hdev,
+ ret = hid_ops->hid_hw_output_report(hdev,
dma_data,
size);
@@ -534,7 +534,7 @@ hid_bpf_input_report(struct hid_bpf_ctx *ctx, enum hid_report_type type, u8 *buf
hdev = (struct hid_device *)ctx->hid; /* discard const */
- return hid_bpf_ops->hid_input_report(hdev, type, buf, size, 0);
+ return hid_ops->hid_input_report(hdev, type, buf, size, 0);
}
__bpf_kfunc_end_defs();
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b1fa0378e8f4..14bbac432de5 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2971,7 +2971,7 @@ int hid_check_keys_pressed(struct hid_device *hid)
EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
#ifdef CONFIG_HID_BPF
-static struct hid_bpf_ops hid_ops = {
+static struct hid_ops __hid_ops = {
.hid_get_report = hid_get_report,
.hid_hw_raw_request = hid_hw_raw_request,
.hid_hw_output_report = hid_hw_output_report,
@@ -2992,7 +2992,7 @@ static int __init hid_init(void)
}
#ifdef CONFIG_HID_BPF
- hid_bpf_ops = &hid_ops;
+ hid_ops = &__hid_ops;
#endif
ret = hidraw_init();
@@ -3011,7 +3011,7 @@ static int __init hid_init(void)
static void __exit hid_exit(void)
{
#ifdef CONFIG_HID_BPF
- hid_bpf_ops = NULL;
+ hid_ops = NULL;
#endif
hid_debug_exit();
hidraw_exit();
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index eec2592dec12..a66103618e6e 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -97,7 +97,7 @@ enum hid_bpf_prog_type {
struct hid_report_enum;
-struct hid_bpf_ops {
+struct hid_ops {
struct hid_report *(*hid_get_report)(struct hid_report_enum *report_enum, const u8 *data);
int (*hid_hw_raw_request)(struct hid_device *hdev,
unsigned char reportnum, __u8 *buf,
@@ -110,7 +110,7 @@ struct hid_bpf_ops {
const struct bus_type *bus_type;
};
-extern struct hid_bpf_ops *hid_bpf_ops;
+extern struct hid_ops *hid_ops;
struct hid_bpf_prog_list {
u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
--
2.44.0
^ permalink raw reply related
* [PATCH HID 00/13] HID: convert HID-BPF into using bpf_struct_ops
From: Benjamin Tissoires @ 2024-05-28 13:14 UTC (permalink / raw)
To: Shuah Khan, Jiri Kosina, Jonathan Corbet, Alexei Starovoitov
Cc: linux-kselftest, linux-kernel, bpf, linux-input, linux-doc,
Benjamin Tissoires, Peter Hutterer
The purpose of this series is to rethink how HID-BPF is invoked.
Currently it implies a jmp table, a prog fd bpf_map, a preloaded tracing
bpf program and a lot of manual work for handling the bpf program
lifetime and addition/removal.
OTOH, bpf_struct_ops take care of most of the bpf handling leaving us
with a simple list of ops pointers, and we can directly call the
struct_ops program from the kernel as a regular function.
The net gain right now is in term of code simplicity and lines of code
removal (though is an API breakage), but udev-hid-bpf is able to handle
such breakages.
In the near future, we will be able to extend the HID-BPF struct_ops
with entrypoints for hid_hw_raw_request() and hid_hw_output_report(),
allowing for covering all of the initial use cases:
- firewalling a HID device
- fixing all of the HID device interactions (not just device events as
it is right now).
The matching user-space loader (udev-hid-bpf) MR is at
https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests/86
I'll put it out of draft once this is merged.
Cheers,
Benjamin
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
Benjamin Tissoires (13):
HID: rename struct hid_bpf_ops into hid_ops
HID: bpf: add hid_get/put_device() helpers
HID: bpf: implement HID-BPF through bpf_struct_ops
selftests/hid: convert the hid_bpf selftests with struct_ops
HID: samples: convert the 2 HID-BPF samples into struct_ops
HID: bpf: add defines for HID-BPF SEC in in-tree bpf fixes
HID: bpf: convert in-tree fixes into struct_ops
HID: bpf: remove tracing HID-BPF capability
selftests/hid: add subprog call test
Documentation: HID: amend HID-BPF for struct_ops
Documentation: HID: add a small blurb on udev-hid-bpf
HID: bpf: Artist24: remove unused variable
HID: bpf: error on warnings when compiling bpf objects
Documentation/hid/hid-bpf.rst | 162 +++---
drivers/hid/bpf/Makefile | 2 +-
drivers/hid/bpf/entrypoints/Makefile | 93 ----
drivers/hid/bpf/entrypoints/README | 4 -
drivers/hid/bpf/entrypoints/entrypoints.bpf.c | 25 -
drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 248 ---------
drivers/hid/bpf/hid_bpf_dispatch.c | 266 +++-------
drivers/hid/bpf/hid_bpf_dispatch.h | 12 +-
drivers/hid/bpf/hid_bpf_jmp_table.c | 565 ---------------------
drivers/hid/bpf/hid_bpf_struct_ops.c | 246 +++++++++
drivers/hid/bpf/progs/FR-TEC__Raptor-Mach-2.bpf.c | 9 +-
drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c | 6 +-
drivers/hid/bpf/progs/Huion__Kamvas-Pro-19.bpf.c | 9 +-
.../hid/bpf/progs/IOGEAR__Kaliber-MMOmentum.bpf.c | 6 +-
drivers/hid/bpf/progs/Makefile | 2 +-
.../hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c | 6 +-
drivers/hid/bpf/progs/Wacom__ArtPen.bpf.c | 6 +-
drivers/hid/bpf/progs/XPPen__Artist24.bpf.c | 10 +-
drivers/hid/bpf/progs/XPPen__ArtistPro16Gen2.bpf.c | 24 +-
drivers/hid/bpf/progs/hid_bpf.h | 5 +
drivers/hid/hid-core.c | 6 +-
include/linux/hid_bpf.h | 109 ++--
samples/hid/Makefile | 5 +-
samples/hid/hid_bpf_attach.bpf.c | 18 -
samples/hid/hid_bpf_attach.h | 14 -
samples/hid/hid_mouse.bpf.c | 26 +-
samples/hid/hid_mouse.c | 39 +-
samples/hid/hid_surface_dial.bpf.c | 10 +-
samples/hid/hid_surface_dial.c | 53 +-
tools/testing/selftests/hid/hid_bpf.c | 100 +++-
tools/testing/selftests/hid/progs/hid.c | 100 +++-
31 files changed, 744 insertions(+), 1442 deletions(-)
---
base-commit: 70ec81c2e2b4005465ad0d042e90b36087c36104
change-id: 20240513-hid_bpf_struct_ops-e3212a224555
Best regards,
--
Benjamin Tissoires <bentiss@kernel.org>
^ permalink raw reply
* Re: [PATCH 2/2] HID: intel-ish-hid: fix endian-conversion
From: Arnd Bergmann @ 2024-05-28 12:45 UTC (permalink / raw)
To: Arnd Bergmann, srinivas.pandruvada@linux.intel.com, Jiri Kosina,
Benjamin Tissoires, Lixu Zhang
Cc: linux-input, linux-kernel
In-Reply-To: <20240528115802.3122955-2-arnd@kernel.org>
On Tue, May 28, 2024, at 13:57, Arnd Bergmann wrote:
>
> for (i = 0; i < fragment->fragment_cnt && offset < ish_fw->size; i++)
> {
> dma_bufs[i] = dma_alloc_coherent(dev->devc, fragment_size,
> &dma_addr, GFP_KERNEL);
> + dma_bufs[i] = dma_alloc_coherent(dev->devc, fragment_size,
> + &dma, GFP_KERNEL);
> if (!dma_bufs[i])
> return -ENOMEM;
>
Sorry about this one, the duplicate linen was an incorrect
rebase. I've fixed this one locally but did not resend the
series since I'm still waiting for other review comments.
Arnd
^ permalink raw reply
* [PATCH 2/2] HID: intel-ish-hid: fix endian-conversion
From: Arnd Bergmann @ 2024-05-28 11:57 UTC (permalink / raw)
To: Srinivas Pandruvada, Jiri Kosina, Benjamin Tissoires, Zhang Lixu
Cc: Arnd Bergmann, linux-input, linux-kernel
In-Reply-To: <20240528115802.3122955-1-arnd@kernel.org>
From: Arnd Bergmann <arnd@arndb.de>
The newly added file causes a ton of sparse warnings about the
incorrect use of __le32 and similar types:
drivers/hid/intel-ish-hid/ishtp/loader.c:179:17: warning: cast from restricted __le32
drivers/hid/intel-ish-hid/ishtp/loader.c:182:50: warning: incorrect type in assignment (different base types)
drivers/hid/intel-ish-hid/ishtp/loader.c:182:50: expected restricted __le32 [usertype] length
drivers/hid/intel-ish-hid/ishtp/loader.c:182:50: got restricted __le16 [usertype]
drivers/hid/intel-ish-hid/ishtp/loader.c:183:50: warning: incorrect type in assignment (different base types)
drivers/hid/intel-ish-hid/ishtp/loader.c:183:50: expected restricted __le32 [usertype] fw_off
drivers/hid/intel-ish-hid/ishtp/loader.c:183:50: got restricted __le16 [usertype]
Add the necessary conversions and use temporary variables where appropriate
to avoid converting back.
Fixes: 579a267e4617 ("HID: intel-ish-hid: Implement loading firmware from host feature")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
I noticed this one while looking at the bug that was fixed in
236049723826 ("HID: intel-ish-hid: Fix build error for COMPILE_TEST")
---
drivers/hid/intel-ish-hid/ishtp/loader.c | 69 +++++++++++++-----------
drivers/hid/intel-ish-hid/ishtp/loader.h | 33 +++++++-----
2 files changed, 58 insertions(+), 44 deletions(-)
diff --git a/drivers/hid/intel-ish-hid/ishtp/loader.c b/drivers/hid/intel-ish-hid/ishtp/loader.c
index 062d1b25eaa7..1d4cb99d2130 100644
--- a/drivers/hid/intel-ish-hid/ishtp/loader.c
+++ b/drivers/hid/intel-ish-hid/ishtp/loader.c
@@ -83,8 +83,8 @@ static int loader_write_message(struct ishtp_device *dev, void *buf, int len)
static int loader_xfer_cmd(struct ishtp_device *dev, void *req, int req_len,
void *resp, int resp_len)
{
- struct loader_msg_header *req_hdr = req;
- struct loader_msg_header *resp_hdr = resp;
+ union loader_msg_header req_hdr;
+ union loader_msg_header resp_hdr;
struct device *devc = dev->devc;
int rv;
@@ -92,34 +92,37 @@ static int loader_xfer_cmd(struct ishtp_device *dev, void *req, int req_len,
dev->fw_loader_rx_size = resp_len;
rv = loader_write_message(dev, req, req_len);
+ req_hdr.val32 = le32_to_cpup(req);
+
if (rv < 0) {
- dev_err(devc, "write cmd %u failed:%d\n", req_hdr->command, rv);
+ dev_err(devc, "write cmd %u failed:%d\n", req_hdr.command, rv);
return rv;
}
/* Wait the ACK */
wait_event_interruptible_timeout(dev->wait_loader_recvd_msg, dev->fw_loader_received,
ISHTP_LOADER_TIMEOUT);
+ resp_hdr.val32 = le32_to_cpup(resp);
dev->fw_loader_rx_size = 0;
dev->fw_loader_rx_buf = NULL;
if (!dev->fw_loader_received) {
- dev_err(devc, "wait response of cmd %u timeout\n", req_hdr->command);
+ dev_err(devc, "wait response of cmd %u timeout\n", req_hdr.command);
return -ETIMEDOUT;
}
- if (!resp_hdr->is_response) {
- dev_err(devc, "not a response for %u\n", req_hdr->command);
+ if (!resp_hdr.is_response) {
+ dev_err(devc, "not a response for %u\n", req_hdr.command);
return -EBADMSG;
}
- if (req_hdr->command != resp_hdr->command) {
- dev_err(devc, "unexpected cmd response %u:%u\n", req_hdr->command,
- resp_hdr->command);
+ if (req_hdr.command != resp_hdr.command) {
+ dev_err(devc, "unexpected cmd response %u:%u\n", req_hdr.command,
+ resp_hdr.command);
return -EBADMSG;
}
- if (resp_hdr->status) {
- dev_err(devc, "cmd %u failed %u\n", req_hdr->command, resp_hdr->status);
+ if (resp_hdr.status) {
+ dev_err(devc, "cmd %u failed %u\n", req_hdr.command, resp_hdr.status);
return -EIO;
}
@@ -162,25 +165,30 @@ static void release_dma_bufs(struct ishtp_device *dev,
static int prepare_dma_bufs(struct ishtp_device *dev,
const struct firmware *ish_fw,
struct loader_xfer_dma_fragment *fragment,
- void **dma_bufs, u32 fragment_size)
+ void **dma_bufs, u32 fragment_size, u32 fragment_count)
{
dma_addr_t dma_addr;
u32 offset = 0;
+ u32 length;
int i;
for (i = 0; i < fragment->fragment_cnt && offset < ish_fw->size; i++) {
dma_bufs[i] = dma_alloc_coherent(dev->devc, fragment_size, &dma_addr, GFP_KERNEL);
+ dma_bufs[i] = dma_alloc_coherent(dev->devc, fragment_size,
+ &dma, GFP_KERNEL);
if (!dma_bufs[i])
return -ENOMEM;
fragment->fragment_tbl[i].ddr_adrs = cpu_to_le64(dma_addr);
- memcpy(dma_bufs[i], ish_fw->data + offset, fragment->fragment_tbl[i].length);
+ memcpy(dma_bufs[i], ish_fw->data + offset, le32_to_cpu(fragment->fragment_tbl[i].length));
dma_wmb();
- fragment->fragment_tbl[i].length = clamp(ish_fw->size - offset, 0, fragment_size);
- fragment->fragment_tbl[i].fw_off = offset;
+ fragment->fragment_tbl[i].ddr_adrs = cpu_to_le64(dma);
+ length = clamp(ish_fw->size - offset, 0, fragment_size);
+ fragment->fragment_tbl[i].length = cpu_to_le32(length);
+ fragment->fragment_tbl[i].fw_off = cpu_to_le32(offset);
- offset += fragment->fragment_tbl[i].length;
+ offset += length;
}
return 0;
@@ -208,17 +216,17 @@ void ishtp_loader_work(struct work_struct *work)
{
DEFINE_RAW_FLEX(struct loader_xfer_dma_fragment, fragment, fragment_tbl, FRAGMENT_MAX_NUM);
struct ishtp_device *dev = container_of(work, struct ishtp_device, work_fw_loader);
- struct loader_xfer_query query = {
- .header.command = LOADER_CMD_XFER_QUERY,
- };
- struct loader_start start = {
- .header.command = LOADER_CMD_START,
- };
+ union loader_msg_header query_hdr = { .command = LOADER_CMD_XFER_QUERY, };
+ union loader_msg_header start_hdr = { .command = LOADER_CMD_START, };
+ union loader_msg_header fragment_hdr = { .command = LOADER_CMD_XFER_FRAGMENT, };
+ struct loader_xfer_query query = { .header = cpu_to_le32(query_hdr.val32), };
+ struct loader_start start = { .header = cpu_to_le32(start_hdr.val32), };
union loader_recv_message recv_msg;
char *filename = dev->driver_data->fw_filename;
const struct firmware *ish_fw;
void *dma_bufs[FRAGMENT_MAX_NUM] = {};
u32 fragment_size;
+ u32 fragment_count;
int retry = ISHTP_LOADER_RETRY_TIMES;
int rv;
@@ -228,23 +236,24 @@ void ishtp_loader_work(struct work_struct *work)
return;
}
- fragment->fragment.header.command = LOADER_CMD_XFER_FRAGMENT;
- fragment->fragment.xfer_mode = LOADER_XFER_MODE_DMA;
- fragment->fragment.is_last = 1;
- fragment->fragment.size = ish_fw->size;
+ fragment->fragment.header = cpu_to_le32(fragment_hdr.val32);;
+ fragment->fragment.xfer_mode = cpu_to_le32(LOADER_XFER_MODE_DMA);
+ fragment->fragment.is_last = cpu_to_le32(1);
+ fragment->fragment.size = cpu_to_le32(ish_fw->size);
/* Calculate the size of a single DMA fragment */
fragment_size = PFN_ALIGN(DIV_ROUND_UP(ish_fw->size, FRAGMENT_MAX_NUM));
/* Calculate the count of DMA fragments */
- fragment->fragment_cnt = DIV_ROUND_UP(ish_fw->size, fragment_size);
+ fragment_count = DIV_ROUND_UP(ish_fw->size, fragment_size);
+ fragment->fragment_cnt = cpu_to_le32(fragment_count);
- rv = prepare_dma_bufs(dev, ish_fw, fragment, dma_bufs, fragment_size);
+ rv = prepare_dma_bufs(dev, ish_fw, fragment, dma_bufs, fragment_size, fragment_count);
if (rv) {
dev_err(dev->devc, "prepare DMA buffer failed.\n");
goto out;
}
do {
- query.image_size = ish_fw->size;
+ query.image_size = cpu_to_le32(ish_fw->size);
rv = loader_xfer_cmd(dev, &query, sizeof(query), recv_msg.raw_data,
sizeof(struct loader_xfer_query_ack));
if (rv)
@@ -257,7 +266,7 @@ void ishtp_loader_work(struct work_struct *work)
recv_msg.query_ack.version_build);
rv = loader_xfer_cmd(dev, fragment,
- struct_size(fragment, fragment_tbl, fragment->fragment_cnt),
+ struct_size(fragment, fragment_tbl, fragment_count),
recv_msg.raw_data, sizeof(struct loader_xfer_fragment_ack));
if (rv)
continue; /* try again if failed */
diff --git a/drivers/hid/intel-ish-hid/ishtp/loader.h b/drivers/hid/intel-ish-hid/ishtp/loader.h
index 7aa45ebc3f7b..308b96085a4d 100644
--- a/drivers/hid/intel-ish-hid/ishtp/loader.h
+++ b/drivers/hid/intel-ish-hid/ishtp/loader.h
@@ -30,19 +30,23 @@ struct work_struct;
#define LOADER_XFER_MODE_DMA BIT(0)
/**
- * struct loader_msg_header - ISHTP firmware loader message header
+ * union loader_msg_header - ISHTP firmware loader message header
* @command: Command type
* @is_response: Indicates if the message is a response
* @has_next: Indicates if there is a next message
* @reserved: Reserved for future use
* @status: Status of the message
- */
-struct loader_msg_header {
- __le32 command:7;
- __le32 is_response:1;
- __le32 has_next:1;
- __le32 reserved:15;
- __le32 status:8;
+ * @val32: entire header as a 32-bit value
+ */
+union loader_msg_header {
+ struct {
+ __u32 command:7;
+ __u32 is_response:1;
+ __u32 has_next:1;
+ __u32 reserved:15;
+ __u32 status:8;
+ };
+ __u32 val32;
};
/**
@@ -51,7 +55,7 @@ struct loader_msg_header {
* @image_size: Size of the image
*/
struct loader_xfer_query {
- struct loader_msg_header header;
+ __le32 header;
__le32 image_size;
};
@@ -103,7 +107,7 @@ struct loader_capability {
* @capability: Loader capability
*/
struct loader_xfer_query_ack {
- struct loader_msg_header header;
+ __le32 header;
__le16 version_major;
__le16 version_minor;
__le16 version_hotfix;
@@ -122,7 +126,7 @@ struct loader_xfer_query_ack {
* @is_last: Is last
*/
struct loader_xfer_fragment {
- struct loader_msg_header header;
+ __le32 header;
__le32 xfer_mode;
__le32 offset;
__le32 size;
@@ -134,7 +138,7 @@ struct loader_xfer_fragment {
* @header: Header of the message
*/
struct loader_xfer_fragment_ack {
- struct loader_msg_header header;
+ __le32 header;
};
/**
@@ -170,7 +174,7 @@ struct loader_xfer_dma_fragment {
* @header: Header of the message
*/
struct loader_start {
- struct loader_msg_header header;
+ __le32 header;
};
/**
@@ -178,10 +182,11 @@ struct loader_start {
* @header: Header of the message
*/
struct loader_start_ack {
- struct loader_msg_header header;
+ __le32 header;
};
union loader_recv_message {
+ __le32 header;
struct loader_xfer_query_ack query_ack;
struct loader_xfer_fragment_ack fragment_ack;
struct loader_start_ack start_ack;
--
2.39.2
^ permalink raw reply related
* [PATCH 1/2] HID: intel-ish-hid: fix cache management mistake
From: Arnd Bergmann @ 2024-05-28 11:57 UTC (permalink / raw)
To: Srinivas Pandruvada, Jiri Kosina, Benjamin Tissoires, Zhang Lixu
Cc: Arnd Bergmann, linux-input, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
The low-level cache operation on a coherent buffer is incorrect,
as coherent DMA memory may not actually be cached. Instead, use a DMA
barrier that ensures that the data is visible to the DMA master before
the address is and move the memcpy() before the reference.
Fixes: 579a267e4617 ("HID: intel-ish-hid: Implement loading firmware from host feature")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
I noticed this one while looking at the bug that was fixed in
236049723826 ("HID: intel-ish-hid: Fix build error for COMPILE_TEST")
---
drivers/hid/intel-ish-hid/ishtp/loader.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/intel-ish-hid/ishtp/loader.c b/drivers/hid/intel-ish-hid/ishtp/loader.c
index 2785b04a2f5a..062d1b25eaa7 100644
--- a/drivers/hid/intel-ish-hid/ishtp/loader.c
+++ b/drivers/hid/intel-ish-hid/ishtp/loader.c
@@ -33,7 +33,6 @@
#define dev_fmt(fmt) "ISH loader: " fmt
-#include <linux/cacheflush.h>
#include <linux/container_of.h>
#include <linux/dev_printk.h>
#include <linux/dma-mapping.h>
@@ -175,10 +174,11 @@ static int prepare_dma_bufs(struct ishtp_device *dev,
return -ENOMEM;
fragment->fragment_tbl[i].ddr_adrs = cpu_to_le64(dma_addr);
+
+ memcpy(dma_bufs[i], ish_fw->data + offset, fragment->fragment_tbl[i].length);
+ dma_wmb();
fragment->fragment_tbl[i].length = clamp(ish_fw->size - offset, 0, fragment_size);
fragment->fragment_tbl[i].fw_off = offset;
- memcpy(dma_bufs[i], ish_fw->data + offset, fragment->fragment_tbl[i].length);
- clflush_cache_range(dma_bufs[i], fragment_size);
offset += fragment->fragment_tbl[i].length;
}
--
2.39.2
^ permalink raw reply related
* Re: [PATCH] hid-asus: use hid for brightness control on keyboard
From: Ilpo Järvinen @ 2024-05-28 8:36 UTC (permalink / raw)
To: Luke D. Jones
Cc: jikos, Hans de Goede, corentin.chary, platform-driver-x86, LKML,
linux-input, bentiss
In-Reply-To: <20240528013959.14661-1-luke@ljones.dev>
On Tue, 28 May 2024, Luke D. Jones wrote:
> On almost all ASUS ROG series laptops the MCU used for the USB keyboard
> also has a HID packet used for setting the brightness. This is usually
> the same as the WMI method. But in some laptops the WMI method either
> is missing or doesn't work, so we should default to the HID control.
>
> Signed-off-by: Luke D. Jones <luke@ljones.dev>
> ---
> drivers/hid/hid-asus.c | 19 ++++++++++++-
> drivers/platform/x86/asus-wmi.c | 3 ++-
> include/linux/platform_data/x86/asus-wmi.h | 31 ++++++++++++++++++++++
> 3 files changed, 51 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
> index 02de2bf4f790..9389a3e733e3 100644
> --- a/drivers/hid/hid-asus.c
> +++ b/drivers/hid/hid-asus.c
> @@ -101,6 +101,7 @@ struct asus_kbd_leds {
> unsigned int brightness;
> spinlock_t lock;
> bool removed;
> + int report_id;
> };
>
> struct asus_touchpad_info {
> @@ -473,7 +474,7 @@ static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev)
> static void asus_kbd_backlight_work(struct work_struct *work)
> {
> struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work);
> - u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, 0x00 };
> + u8 buf[] = { led->report_id, 0xba, 0xc5, 0xc4, 0x00 };
> int ret;
> unsigned long flags;
>
> @@ -492,12 +493,18 @@ static void asus_kbd_backlight_work(struct work_struct *work)
> */
> static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
> {
> + struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
> u32 value;
> int ret;
>
> if (!IS_ENABLED(CONFIG_ASUS_WMI))
> return false;
>
> + if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_use_hidraw_led()) {
> + hid_info(hdev, "using hidraw for asus::kbd_backlight\n");
> + return false;
> + }
> +
> ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS,
> ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
> hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
> @@ -507,6 +514,12 @@ static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
> return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);
> }
>
> +static bool asus_kbd_is_input_led(void)
> +{
> + return dmi_match(DMI_PRODUCT_NAME, "GU605")
> + || dmi_match(DMI_PRODUCT_NAME, "GA403");
> +}
> +
> static int asus_kbd_register_leds(struct hid_device *hdev)
> {
> struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
> @@ -549,6 +562,10 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
> if (!drvdata->kbd_backlight)
> return -ENOMEM;
>
> + drvdata->kbd_backlight->report_id = FEATURE_KBD_REPORT_ID;
> + if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_kbd_is_input_led())
> + drvdata->kbd_backlight->report_id = FEATURE_KBD_LED_REPORT_ID1;
> +
> drvdata->kbd_backlight->removed = false;
> drvdata->kbd_backlight->brightness = 0;
> drvdata->kbd_backlight->hdev = hdev;
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 3f9b6285c9a6..a58df18a70ad 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1681,7 +1681,8 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
> goto error;
> }
>
> - if (!kbd_led_read(asus, &led_val, NULL)) {
> + if (!kbd_led_read(asus, &led_val, NULL) && !asus_use_hidraw_led()) {
> + pr_info("using asus-wmi for asus::kbd_backlight\n");
> asus->kbd_led_wk = led_val;
> asus->kbd_led.name = "asus::kbd_backlight";
> asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 3eb5cd6773ad..79a50102440d 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -160,4 +160,35 @@ static inline int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
> }
> #endif
>
> +/* To be used by both hid-asus and asus-wmi to determine which controls kbd_brightness */
> +#if IS_REACHABLE(CONFIG_ASUS_WMI)
> +static bool asus_use_hidraw_led(void)
Since it's in a header, it's missing inline. However, this function looks
quite complicated so putting it into a header file is questionable to
begin with so I'd prefer it to be in a .c file.
> +{
> + const char *product, *board;
> +
> + product = dmi_get_system_info(DMI_PRODUCT_FAMILY);
> + if (!product)
> + return false;
> +
> + /* These product ranges should all be using HID for keyboard LED */
> + if (strstr(product, "ROG Zephyrus")
> + || strstr(product, "ROG Strix")
> + || strstr(product, "ROG Flow")
> + || strstr(product, "GA403")
> + || strstr(product, "GU605"))
Please align these properly but consider using array and loop.
> + return true;
> +
> + board = dmi_get_system_info(DMI_BOARD_NAME);
> + if (!board)
> + return false;
> +
> + return strstr(board, "RC71L"); /* ROG Ally specific */
> +}
> +#else
> +static inline bool asus_use_hidraw_led(void)
> +{
> + return true;
> +}
> +#endif
> +
> #endif /* __PLATFORM_DATA_X86_ASUS_WMI_H */
>
--
i.
^ permalink raw reply
* Re: [PATCH] hid-asus: use hid for brightness control on keyboard
From: Hans de Goede @ 2024-05-28 8:26 UTC (permalink / raw)
To: Luke D. Jones, jikos
Cc: ilpo.jarvinen, corentin.chary, platform-driver-x86, linux-kernel,
linux-input, bentiss
In-Reply-To: <20240528013959.14661-1-luke@ljones.dev>
Hi Luke,
Thank you for the patch.
On 5/28/24 3:39 AM, Luke D. Jones wrote:
> On almost all ASUS ROG series laptops the MCU used for the USB keyboard
> also has a HID packet used for setting the brightness. This is usually
> the same as the WMI method. But in some laptops the WMI method either
> is missing or doesn't work, so we should default to the HID control.
It looks like you are doing 2 different things in 1 patch here,
please split this into 2 patches:
1. Use a different report_id for HID kbd backlight brightness control
on some models.
2. Skip registering the HID kbd backlight LED class device on some
models.
2 more remarks inline (below):
>
> Signed-off-by: Luke D. Jones <luke@ljones.dev>
> ---
> drivers/hid/hid-asus.c | 19 ++++++++++++-
> drivers/platform/x86/asus-wmi.c | 3 ++-
> include/linux/platform_data/x86/asus-wmi.h | 31 ++++++++++++++++++++++
> 3 files changed, 51 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
> index 02de2bf4f790..9389a3e733e3 100644
> --- a/drivers/hid/hid-asus.c
> +++ b/drivers/hid/hid-asus.c
> @@ -101,6 +101,7 @@ struct asus_kbd_leds {
> unsigned int brightness;
> spinlock_t lock;
> bool removed;
> + int report_id;
> };
>
> struct asus_touchpad_info {
> @@ -473,7 +474,7 @@ static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev)
> static void asus_kbd_backlight_work(struct work_struct *work)
> {
> struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work);
> - u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, 0x00 };
> + u8 buf[] = { led->report_id, 0xba, 0xc5, 0xc4, 0x00 };
> int ret;
> unsigned long flags;
>
> @@ -492,12 +493,18 @@ static void asus_kbd_backlight_work(struct work_struct *work)
> */
> static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
> {
> + struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
> u32 value;
> int ret;
>
> if (!IS_ENABLED(CONFIG_ASUS_WMI))
> return false;
>
> + if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_use_hidraw_led()) {
> + hid_info(hdev, "using hidraw for asus::kbd_backlight\n");
> + return false;
> + }
> +
You call the helper for this asus_use_hidraw_led() but to me that suggests
that when the function returns true then userspace will control the brightness
to /dev/hidraw# where as what you mean is that the in kernel HID driver will
control the brightness. So please rename the helper to asus_use_hid_led()
and for the message use:
hid_info(hdev, "using HID for asus::kbd_backlight\n");
> ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS,
> ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
> hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
> @@ -507,6 +514,12 @@ static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
> return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);
> }
>
> +static bool asus_kbd_is_input_led(void)
> +{
> + return dmi_match(DMI_PRODUCT_NAME, "GU605")
> + || dmi_match(DMI_PRODUCT_NAME, "GA403");
> +}
> +
> static int asus_kbd_register_leds(struct hid_device *hdev)
> {
> struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
> @@ -549,6 +562,10 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
> if (!drvdata->kbd_backlight)
> return -ENOMEM;
>
> + drvdata->kbd_backlight->report_id = FEATURE_KBD_REPORT_ID;
> + if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_kbd_is_input_led())
> + drvdata->kbd_backlight->report_id = FEATURE_KBD_LED_REPORT_ID1;
> +
> drvdata->kbd_backlight->removed = false;
> drvdata->kbd_backlight->brightness = 0;
> drvdata->kbd_backlight->hdev = hdev;
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 3f9b6285c9a6..a58df18a70ad 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1681,7 +1681,8 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
> goto error;
> }
>
> - if (!kbd_led_read(asus, &led_val, NULL)) {
> + if (!kbd_led_read(asus, &led_val, NULL) && !asus_use_hidraw_led()) {
> + pr_info("using asus-wmi for asus::kbd_backlight\n");
> asus->kbd_led_wk = led_val;
> asus->kbd_led.name = "asus::kbd_backlight";
> asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 3eb5cd6773ad..79a50102440d 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -160,4 +160,35 @@ static inline int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
> }
> #endif
>
> +/* To be used by both hid-asus and asus-wmi to determine which controls kbd_brightness */
> +#if IS_REACHABLE(CONFIG_ASUS_WMI)
This should be IS_ENABLED() otherwise if hid-asus is builtin and
asus-wmi is a module then this will go to the #else when included
from hid-asus.c and thus always return true causing hid-asus to
always register the kbd_backlight LED class device.
> +static bool asus_use_hidraw_led(void)
> +{
> + const char *product, *board;
> +
> + product = dmi_get_system_info(DMI_PRODUCT_FAMILY);
> + if (!product)
> + return false;
> +
> + /* These product ranges should all be using HID for keyboard LED */
> + if (strstr(product, "ROG Zephyrus")
> + || strstr(product, "ROG Strix")
> + || strstr(product, "ROG Flow")
> + || strstr(product, "GA403")
> + || strstr(product, "GU605"))
> + return true;
> +
> + board = dmi_get_system_info(DMI_BOARD_NAME);
> + if (!board)
> + return false;
> +
> + return strstr(board, "RC71L"); /* ROG Ally specific */
> +}
> +#else
> +static inline bool asus_use_hidraw_led(void)
> +{
> + return true;
> +}
> +#endif
> +
> #endif /* __PLATFORM_DATA_X86_ASUS_WMI_H */
Regards,
Hans
^ permalink raw reply
* Re: [syzbot] [input?] [usb?] KMSAN: uninit-value in asus_report_fixup
From: syzbot @ 2024-05-28 5:46 UTC (permalink / raw)
To: andrewjballance, benjamin.tissoires, bentiss, jikos, jkosina,
linux-input, linux-kernel-mentees, linux-kernel, linux-usb, luke,
skhan, syzkaller-bugs
In-Reply-To: <20240528050555.1150628-1-andrewjballance@gmail.com>
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
sert=on, ref-verify=on, zoned=yes, fsverity=yes
[ 50.230614][ T1] Key type encrypted registered
[ 50.235891][ T1] AppArmor: AppArmor sha256 policy hashing enabled
[ 50.242800][ T1] ima: No TPM chip found, activating TPM-bypass!
[ 50.249865][ T1] Loading compiled-in module X.509 certificates
[ 50.292391][ T1] Loaded X.509 cert 'Build time autogenerated kernel key: 2ef82123926fa34f508acba9911fce577bb4fe8a'
[ 50.303920][ T1] ima: Allocated hash algorithm: sha256
[ 50.310144][ T1] ima: No architecture policies found
[ 50.316925][ T1] evm: Initialising EVM extended attributes:
[ 50.322973][ T1] evm: security.selinux (disabled)
[ 50.328526][ T1] evm: security.SMACK64 (disabled)
[ 50.334013][ T1] evm: security.SMACK64EXEC (disabled)
[ 50.339602][ T1] evm: security.SMACK64TRANSMUTE (disabled)
[ 50.345640][ T1] evm: security.SMACK64MMAP (disabled)
[ 50.351386][ T1] evm: security.apparmor
[ 50.355851][ T1] evm: security.ima
[ 50.359745][ T1] evm: security.capability
[ 50.364417][ T1] evm: HMAC attrs: 0x1
[ 50.373466][ T1] PM: Magic number: 8:208:619
[ 50.379889][ T1] usb usb14-port4: hash matches
[ 50.386279][ T1] net ifb0: hash matches
[ 50.391057][ T1] tty ptye9: hash matches
[ 50.396054][ T1] tty ptybc: hash matches
[ 50.401524][ T1] printk: legacy console [netcon0] enabled
[ 50.407774][ T1] netconsole: network logging started
[ 50.414999][ T1] gtp: GTP module loaded (pdp ctx size 128 bytes)
[ 50.424381][ T1] rdma_rxe: loaded
[ 50.430039][ T1] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 50.451536][ T1] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 50.469189][ T1] Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
[ 50.477773][ T1] clk: Disabling unused clocks
[ 50.482816][ T1] ALSA device list:
[ 50.486809][ T1] #0: Dummy 1
[ 50.490724][ T1] #1: Loopback 1
[ 50.494616][ T1] #2: Virtual MIDI Card 1
[ 50.505678][ T10] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 50.506128][ T1] md: Waiting for all devices to be available before autodetect
[ 50.517296][ T10] platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
[ 50.524217][ T1] md: If you don't use raid, use raid=noautodetect
[ 50.540178][ T1] md: Autodetecting RAID arrays.
[ 50.545383][ T1] md: autorun ...
[ 50.549388][ T1] md: ... autorun DONE.
[ 50.671837][ T1] EXT4-fs (sda1): mounted filesystem 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 ro with ordered data mode. Quota mode: none.
[ 50.685698][ T1] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[ 50.779387][ T1] devtmpfs: mounted
[ 51.037410][ T1] Freeing unused kernel image (initmem) memory: 37032K
[ 51.049223][ T1] Write protecting the kernel read-only data: 262144k
[ 51.096766][ T1] Freeing unused kernel image (rodata/data gap) memory: 1808K
[ 52.746982][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 52.757511][ T1] x86/mm: Checking user space page tables
[ 54.254031][ T1] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 54.263213][ T1] Failed to set sysctl parameter 'kernel.hung_task_all_cpu_backtrace=1': parameter not found
[ 54.285036][ T1] Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found
[ 54.296902][ T1] Run /sbin/init as init process
[ 55.866548][ T4446] mount (4446) used greatest stack depth: 8144 bytes left
[ 55.941342][ T4447] EXT4-fs (sda1): re-mounted 5941fea2-f5fa-4b4e-b5ef-9af118b27b95 r/w. Quota mode: none.
mount: mounting smackfs on /sys/fs/smackfs failed: No such file or directory
mount: mounting selinuxfs on /sys/fs/selinux failed: No such file or directory
[ 56.283370][ T4450] mount (4450) used greatest stack depth: 5568 bytes left
Starting syslogd: OK
Starting acpid: OK
Starting klogd: OK
Running sysctl: OK
Populating /dev using udev: [ 60.169672][ T4480] udevd[4480]: starting version 3.2.11
[ 63.755909][ T4481] udevd[4481]: starting eudev-3.2.11
[ 63.769352][ T4480] udevd (4480) used greatest stack depth: 5272 bytes left
done
Starting system message bus: done
Starting iptables: OK
Starting network: OK
Starting dhcpcd...
dhcpcd-9.4.1 starting
dev: loaded udev
DUID 00:04:c7:fd:4a:df:9d:a6:e9:60:55:7b:b4:5b:1f:77:00:5c
forked to background, child pid 4693
[ 111.458895][ T4694] 8021q: adding VLAN 0 to HW filter on device bond0
[ 111.496440][ T4694] eql: remember to turn off Van-Jacobson compression on your slave devices
[ 111.697880][ T10] cfg80211: failed to load regulatory.db
Starting sshd: [ 113.751142][ T4779] sshd (4779) used greatest stack depth: 4720 bytes left
[ 113.792885][ C0] =====================================================
[ 113.800595][ C0] BUG: KMSAN: uninit-value in receive_buf+0x25e3/0x5fd0
[ 113.807866][ C0] receive_buf+0x25e3/0x5fd0
[ 113.812660][ C0] virtnet_poll+0xd1c/0x23c0
[ 113.817511][ C0] __napi_poll+0xe7/0x980
[ 113.822060][ C0] net_rx_action+0x82a/0x1850
[ 113.827121][ C0] handle_softirqs+0x1ce/0x800
[ 113.832171][ C0] __irq_exit_rcu+0x68/0x120
[ 113.837029][ C0] irq_exit_rcu+0x12/0x20
[ 113.841544][ C0] common_interrupt+0x94/0xa0
[ 113.846507][ C0] asm_common_interrupt+0x2b/0x40
[ 113.851825][ C0] kmsan_internal_set_shadow_origin+0x76/0xe0
[ 113.858320][ C0] kmsan_internal_unpoison_memory+0x14/0x20
[ 113.864659][ C0] kmsan_unpoison_memory+0x28/0x40
[ 113.869970][ C0] prep_new_page+0x115/0x540
[ 113.874876][ C0] get_page_from_freelist+0x1578/0x15f0
[ 113.880730][ C0] __alloc_pages_noprof+0x8a7/0xe70
[ 113.886250][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 113.892181][ C0] vma_alloc_folio_noprof+0x412/0x750
[ 113.898206][ C0] handle_mm_fault+0x907c/0xe610
[ 113.903457][ C0] exc_page_fault+0x41b/0x700
[ 113.908439][ C0] asm_exc_page_fault+0x2b/0x30
[ 113.913577][ C0]
[ 113.916067][ C0] Uninit was created at:
OK[ 113.920879][ C0] __alloc_pages_noprof+0x9d6/0xe70
[ 113.926417][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 113.932200][ C0] alloc_pages_noprof+0x1bf/0x1e0
[ 113.937655][ C0] skb_page_frag_refill+0x2bf/0x7c0
[ 113.943288][ C0] virtnet_rq_alloc+0x43/0xbb0
[ 113.948380][ C0] try_fill_recv+0x3f0/0x2f50
[ 113.953224][ C0] virtnet_open+0x1cc/0xb00
[ 113.958077][ C0] __dev_open+0x546/0x6f0
[ 113.962708][ C0] __dev_change_flags+0x309/0x9a0
[ 113.968302][ C0] dev_change_flags+0x8e/0x1d0
[ 113.973240][ C0] devinet_ioctl+0x13ec/0x22c0
[ 113.978437][ C0] inet_ioctl+0x4bd/0x6d0
[ 113.983181][ C0] sock_do_ioctl+0xb7/0x540
[ 113.987928][ C0] sock_ioctl+0x727/0xd70
[ 113.992433][ C0] __se_sys_ioctl+0x261/0x450
[ 113.997393][ C0] __x64_sys_ioctl+0x96/0xe0
[ 114.002313][ C0] x64_sys_call+0x18c0/0x3b90
[ 114.007248][ C0] do_syscall_64+0xcd/0x1e0
[ 114.011927][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 114.018164][ C0]
[ 114.020697][ C0] CPU: 0 PID: 4786 Comm: rm Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5-dirty #0
[ 114.031264][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.041826][ C0] =====================================================
[ 114.049359][ C0] Disabling lock debugging due to kernel taint
[ 114.055708][ C0] Kernel panic - not syncing: kmsan.panic set ...
[ 114.062795][ C0] CPU: 0 PID: 4786 Comm: rm Tainted: G B 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5-dirty #0
[ 114.075000][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 114.085286][ C0] Call Trace:
[ 114.088865][ C0] <IRQ>
[ 114.091913][ C0] dump_stack_lvl+0x216/0x2d0
[ 114.096785][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.102924][ C0] dump_stack+0x1e/0x30
[ 114.107269][ C0] panic+0x4e2/0xcd0
[ 114.111426][ C0] ? kmsan_get_metadata+0x111/0x1d0
[ 114.116837][ C0] kmsan_report+0x2d5/0x2e0
[ 114.121549][ C0] ? kmsan_alloc_page+0x182/0x220
[ 114.126772][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.132180][ C0] ? __msan_warning+0x95/0x120
[ 114.137205][ C0] ? receive_buf+0x25e3/0x5fd0
[ 114.142074][ C0] ? virtnet_poll+0xd1c/0x23c0
[ 114.147049][ C0] ? __napi_poll+0xe7/0x980
[ 114.151760][ C0] ? net_rx_action+0x82a/0x1850
[ 114.156910][ C0] ? handle_softirqs+0x1ce/0x800
[ 114.161958][ C0] ? __irq_exit_rcu+0x68/0x120
[ 114.166911][ C0] ? irq_exit_rcu+0x12/0x20
[ 114.171601][ C0] ? common_interrupt+0x94/0xa0
[ 114.176565][ C0] ? asm_common_interrupt+0x2b/0x40
[ 114.181863][ C0] ? kmsan_internal_set_shadow_origin+0x76/0xe0
[ 114.188207][ C0] ? kmsan_internal_unpoison_memory+0x14/0x20
[ 114.194391][ C0] ? kmsan_unpoison_memory+0x28/0x40
[ 114.199793][ C0] ? prep_new_page+0x115/0x540
[ 114.204666][ C0] ? get_page_from_freelist+0x1578/0x15f0
[ 114.210579][ C0] ? __alloc_pages_noprof+0x8a7/0xe70
[ 114.216060][ C0] ? alloc_pages_mpol_noprof+0x299/0x990
[ 114.221983][ C0] ? vma_alloc_folio_noprof+0x412/0x750
[ 114.227836][ C0] ? handle_mm_fault+0x907c/0xe610
[ 114.233178][ C0] ? exc_page_fault+0x41b/0x700
[ 114.238164][ C0] ? asm_exc_page_fault+0x2b/0x30
[ 114.243578][ C0] ? kmsan_internal_memmove_metadata+0x17b/0x230
syzkaller[ 114.250182][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.256633][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.262332][ C0] ? page_to_skb+0xdae/0x1620
[ 114.267233][ C0] __msan_warning+0x95/0x120
[ 114.272275][ C0] receive_buf+0x25e3/0x5fd0
[ 114.277094][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.282402][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.288519][ C0] virtnet_poll+0xd1c/0x23c0
[ 114.293235][ C0] ? __pfx_virtnet_poll+0x10/0x10
[ 114.298573][ C0] __napi_poll+0xe7/0x980
[ 114.303042][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.308529][ C0] net_rx_action+0x82a/0x1850
[ 114.313443][ C0] ? sched_clock_cpu+0x55/0x870
[ 114.318434][ C0] ? __pfx_net_rx_action+0x10/0x10
[ 114.323766][ C0] handle_softirqs+0x1ce/0x800
[ 114.328788][ C0] __irq_exit_rcu+0x68/0x120
[ 114.333488][ C0] irq_exit_rcu+0x12/0x20
[ 114.337976][ C0] common_interrupt+0x94/0xa0
[ 114.343068][ C0] </IRQ>
[ 114.346080][ C0] <TASK>
[ 114.349188][ C0] asm_common_interrupt+0x2b/0x40
[ 114.354554][ C0] RIP: 0010:kmsan_internal_set_shadow_origin+0x76/0xe0
[ 114.361736][ C0] Code: f0 83 e0 03 49 83 e6 fc 49 8d 5c 07 03 4c 89 f7 be 01 00 00 00 e8 3a 35 00 00 48 83 fb 04 72 1a 48 c1 eb 02 31 c9 44 89 2c 88 <ff> c1 48 63 c9 48 39 cb 77 f2 eb 04 84 db 75 0f 5b 41 5c 41 5d 41
[ 114.382246][ C0] RSP: 0000:ffff88812094b8b0 EFLAGS: 00000216
[ 114.388520][ C0] RAX: ffff8881212ed000 RBX: 0000000000000400 RCX: 000000000000019b
[ 114.396599][ C0] RDX: 00000001216ed000 RSI: ffff88813fff9240 RDI: ffff8881216ed000
[ 114.404856][ C0] RBP: ffff88812094b8d8 R08: ffffea000000000f R09: 0000000000000000
[ 114.413096][ C0] R10: ffff888120eed000 R11: 0000000000000004 R12: 0000000000000000
[ 114.421164][ C0] R13: 0000000000000000 R14: ffff8881216ed000 R15: 0000000000001000
[ 114.429361][ C0] kmsan_internal_unpoison_memory+0x14/0x20
[ 114.435481][ C0] kmsan_unpoison_memory+0x28/0x40
[ 114.441106][ C0] prep_new_page+0x115/0x540
[ 114.445833][ C0] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 114.451866][ C0] get_page_from_freelist+0x1578/0x15f0
[ 114.457804][ C0] __alloc_pages_noprof+0x8a7/0xe70
[ 114.463144][ C0] alloc_pages_mpol_noprof+0x299/0x990
[ 114.469050][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.474479][ C0] vma_alloc_folio_noprof+0x412/0x750
[ 114.480070][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.485509][ C0] handle_mm_fault+0x907c/0xe610
[ 114.491145][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.496501][ C0] ? kmsan_get_metadata+0x146/0x1d0
[ 114.501877][ C0] exc_page_fault+0x41b/0x700
[ 114.506694][ C0] asm_exc_page_fault+0x2b/0x30
[ 114.511959][ C0] RIP: 0033:0x7fbc8aec8b9d
[ 114.517011][ C0] Code: 8b 90 c8 01 00 00 48 81 e2 00 ff ff ff 7e 14 48 89 d1 48 89 15 94 e6 10 00 48 d1 f9 48 89 0d 92 e6 10 00 48 8b 90 d0 01 00 00 <48> 89 15 24 58 11 00 48 8b 90 d8 01 00 00 48 89 15 66 e6 10 00 48
[ 114.536844][ C0] RSP: 002b:00007fffd2152068 EFLAGS: 00010206
[ 114.543432][ C0] RAX: 00007fbc8b0dfa80 RBX: 00007fbc8ae35000 RCX: 0000000000dc0000
[ 114.551697][ C0] RDX: 00000000014a0000 RSI: 00007fbc8ae53540 RDI: 0000000000000000
[ 114.559908][ C0] RBP: 00007fffd2152170 R08: 00007fffd2150000 R09: 00007fbc8b0e0ab0
[ 114.568160][ C0] R10: 00007fbc8ae39ab8 R11: 0000000000000025 R12: 00007fbc8b0a95c0
[ 114.576260][ C0] R13: 00007fbc8b0d4eda R14: 00007fbc8afd68c8 R15: 00007fbc8ae39ab8
[ 114.584358][ C0] </TASK>
[ 114.587837][ C0] Kernel Offset: disabled
[ 114.592358][ C0] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1371669175=/tmp/go-build -gno-record-gcc-switches'
git status (err=<nil>)
HEAD detached at c0f1611a3
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c0f1611a36d66bb0bb8e2f294b97fb685bfc5f9c -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240517-125934'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=c0f1611a36d66bb0bb8e2f294b97fb685bfc5f9c -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240517-125934'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -std=c++11 -I. -Iexecutor/_include -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"c0f1611a36d66bb0bb8e2f294b97fb685bfc5f9c\"
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=15a9822c980000
Tested on:
commit: 2bfcfd58 Merge tag 'pmdomain-v6.10-rc1' of git://git.k..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=54d66e52f38a45d8
dashboard link: https://syzkaller.appspot.com/bug?extid=07762f019fd03d01f04c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=1425c62c980000
^ permalink raw reply
* [PATCH] hid: asus: asus_report_fixup: fix potential read out of bounds
From: Andrew Ballance @ 2024-05-28 5:05 UTC (permalink / raw)
To: syzbot+07762f019fd03d01f04c
Cc: benjamin.tissoires, bentiss, jikos, jkosina, linux-input,
linux-kernel, linux-usb, luke, syzkaller-bugs,
linux-kernel-mentees, skhan, Andrew Ballance
In-Reply-To: <000000000000915d550619389e8a@google.com>
#syz test
there may be a read out of the bounds of rdesc.
this adds bounds checks
Signed-off-by: Andrew Ballance <andrewjballance@gmail.com>
---
drivers/hid/hid-asus.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 02de2bf4f790..37e6d25593c2 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -1204,8 +1204,8 @@ static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
}
/* match many more n-key devices */
- if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
- for (int i = 0; i < *rsize + 1; i++) {
+ if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && *rsize > 15) {
+ for (int i = 0; i < *rsize - 15; i++) {
/* offset to the count from 0x5a report part always 14 */
if (rdesc[i] == 0x85 && rdesc[i + 1] == 0x5a &&
rdesc[i + 14] == 0x95 && rdesc[i + 15] == 0x05) {
--
2.45.1
^ permalink raw reply related
* [PATCH] hid-asus: use hid for brightness control on keyboard
From: Luke D. Jones @ 2024-05-28 1:39 UTC (permalink / raw)
To: jikos
Cc: hdegoede, ilpo.jarvinen, corentin.chary, platform-driver-x86,
linux-kernel, linux-input, bentiss, Luke D. Jones
On almost all ASUS ROG series laptops the MCU used for the USB keyboard
also has a HID packet used for setting the brightness. This is usually
the same as the WMI method. But in some laptops the WMI method either
is missing or doesn't work, so we should default to the HID control.
Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
drivers/hid/hid-asus.c | 19 ++++++++++++-
drivers/platform/x86/asus-wmi.c | 3 ++-
include/linux/platform_data/x86/asus-wmi.h | 31 ++++++++++++++++++++++
3 files changed, 51 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 02de2bf4f790..9389a3e733e3 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -101,6 +101,7 @@ struct asus_kbd_leds {
unsigned int brightness;
spinlock_t lock;
bool removed;
+ int report_id;
};
struct asus_touchpad_info {
@@ -473,7 +474,7 @@ static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev)
static void asus_kbd_backlight_work(struct work_struct *work)
{
struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work);
- u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, 0x00 };
+ u8 buf[] = { led->report_id, 0xba, 0xc5, 0xc4, 0x00 };
int ret;
unsigned long flags;
@@ -492,12 +493,18 @@ static void asus_kbd_backlight_work(struct work_struct *work)
*/
static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
{
+ struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
u32 value;
int ret;
if (!IS_ENABLED(CONFIG_ASUS_WMI))
return false;
+ if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_use_hidraw_led()) {
+ hid_info(hdev, "using hidraw for asus::kbd_backlight\n");
+ return false;
+ }
+
ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS,
ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
@@ -507,6 +514,12 @@ static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);
}
+static bool asus_kbd_is_input_led(void)
+{
+ return dmi_match(DMI_PRODUCT_NAME, "GU605")
+ || dmi_match(DMI_PRODUCT_NAME, "GA403");
+}
+
static int asus_kbd_register_leds(struct hid_device *hdev)
{
struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
@@ -549,6 +562,10 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
if (!drvdata->kbd_backlight)
return -ENOMEM;
+ drvdata->kbd_backlight->report_id = FEATURE_KBD_REPORT_ID;
+ if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && asus_kbd_is_input_led())
+ drvdata->kbd_backlight->report_id = FEATURE_KBD_LED_REPORT_ID1;
+
drvdata->kbd_backlight->removed = false;
drvdata->kbd_backlight->brightness = 0;
drvdata->kbd_backlight->hdev = hdev;
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 3f9b6285c9a6..a58df18a70ad 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1681,7 +1681,8 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
goto error;
}
- if (!kbd_led_read(asus, &led_val, NULL)) {
+ if (!kbd_led_read(asus, &led_val, NULL) && !asus_use_hidraw_led()) {
+ pr_info("using asus-wmi for asus::kbd_backlight\n");
asus->kbd_led_wk = led_val;
asus->kbd_led.name = "asus::kbd_backlight";
asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 3eb5cd6773ad..79a50102440d 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -160,4 +160,35 @@ static inline int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
}
#endif
+/* To be used by both hid-asus and asus-wmi to determine which controls kbd_brightness */
+#if IS_REACHABLE(CONFIG_ASUS_WMI)
+static bool asus_use_hidraw_led(void)
+{
+ const char *product, *board;
+
+ product = dmi_get_system_info(DMI_PRODUCT_FAMILY);
+ if (!product)
+ return false;
+
+ /* These product ranges should all be using HID for keyboard LED */
+ if (strstr(product, "ROG Zephyrus")
+ || strstr(product, "ROG Strix")
+ || strstr(product, "ROG Flow")
+ || strstr(product, "GA403")
+ || strstr(product, "GU605"))
+ return true;
+
+ board = dmi_get_system_info(DMI_BOARD_NAME);
+ if (!board)
+ return false;
+
+ return strstr(board, "RC71L"); /* ROG Ally specific */
+}
+#else
+static inline bool asus_use_hidraw_led(void)
+{
+ return true;
+}
+#endif
+
#endif /* __PLATFORM_DATA_X86_ASUS_WMI_H */
--
2.45.1
^ permalink raw reply related
* Re: [PATCH v10 1/8] x86/vmware: Introduce VMware hypercall API
From: Borislav Petkov @ 2024-05-27 17:07 UTC (permalink / raw)
To: Alexey Makhalov
Cc: linux-kernel, virtualization, hpa, dave.hansen, mingo, tglx, x86,
netdev, richardcochran, linux-input, dmitry.torokhov, zackr,
linux-graphics-maintainer, pv-drivers, timothym, akaher,
dri-devel, daniel, airlied, tzimmermann, mripard,
maarten.lankhorst, horms, kirill.shutemov
In-Reply-To: <20240523191446.54695-2-alexey.makhalov@broadcom.com>
On Thu, May 23, 2024 at 12:14:39PM -0700, Alexey Makhalov wrote:
> +#define VMWARE_HYPERCALL \
> + ALTERNATIVE_3("", \
> + "jmp .Lport_call%=", X86_FEATURE_HYPERVISOR, \
> + "jmp .Lvmcall%=", X86_FEATURE_VMCALL, \
> + "vmmcall\n\t" \
> + "jmp .Lend%=", X86_FEATURE_VMW_VMMCALL) \
> + "cmpb $" \
> + __stringify(CPUID_VMWARE_FEATURES_ECX_VMMCALL) \
> + ", %[mode]\n\t" \
> + "jg .Lvmcall%=\n\t" \
> + "je .Lvmmcall%=\n\t" \
> + ".Lport_call%=: movw %[port], %%dx\n\t" \
> + "inl (%%dx), %%eax\n\t" \
> + "jmp .Lend%=\n\t" \
> + ".Lvmmcall%=: vmmcall\n\t" \
> + "jmp .Lend%=\n\t" \
> + ".Lvmcall%=: vmcall\n\t" \
> + ".Lend%=:"
So applied (and with minor fixups for the proper indentation, see end of
this mail) this looks like this:
.pushsection .altinstructions,"a"
.long 661b - .
.long 6641f - .
.4byte ( 4*32+31)
.byte 663b-661b
.byte 6651f-6641f
.long 661b - .
.long 6642f - .
.4byte ( 8*32+18)
.byte 663b-661b
.byte 6652f-6642f
.long 661b - .
.long 6643f - .
.4byte ( 8*32+19)
.byte 663b-661b
.byte 6653f-6643f
.popsection
.pushsection .altinstr_replacement, "ax"
# ALT: replacement 1
6641:
jmp .Lport_call72
6651:
# ALT: replacement 2
6642:
jmp .Lvmcall72
6652:
# ALT: replacement 3
6643:
vmmcall
jmp .Lend72
6653:
.popsection
cmpb $((((1UL))) << (0)), vmware_hypercall_mode(%rip) # vmware_hypercall_mode
jg .Lvmcall72
je .Lvmmcall72
.Lport_call72:
movw $22104, %dx #
inl (%dx), %eax
jmp .Lend72
.Lvmmcall72:
vmmcall
jmp .Lend72
.Lvmcall72:
vmcall
.Lend72:
---
so AFAICT, you want three things:
1. X86_FEATURE_HYPERVISOR - that is always set when running as a guest.
For that it should do:
movw $22104, %dx #
inl (%dx), %eax
2. X86_FEATURE_VMCALL:
vmcall
3. X86_FEATURE_VMW_VMMCALL:
vmmcall
So why don't you simply do that?
vmware_set_capabilities() sets vmware_hypercall_mode *and* those feature
flags at the same time.
And you either support VMCALL or VMMCALL so the first thing should be the
fallback for some ancient crap.
IOW, your hypercall alternative should simply be:
ALTERNATIVE_2("vmcall", "vmmcall", X86_FEATURE_VMW_VMMCALL, "movw %[port], %%dx; "inl (%%dx), %%eax", X86_FEATURE_HYPERVISOR);
without any more silly dance?
Hmmm?
---
Fixup indentation for proper .s output:
diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
index 5114f4c75c54..8be877d8bb7c 100644
--- a/arch/x86/include/asm/vmware.h
+++ b/arch/x86/include/asm/vmware.h
@@ -70,17 +70,18 @@ extern u8 vmware_hypercall_mode;
"jmp .Lvmcall%=", X86_FEATURE_VMCALL, \
"vmmcall\n\t" \
"jmp .Lend%=", X86_FEATURE_VMW_VMMCALL) \
- "cmpb $" \
- __stringify(CPUID_VMWARE_FEATURES_ECX_VMMCALL) \
- ", %[mode]\n\t" \
+ "\tcmpb $" __stringify(CPUID_VMWARE_FEATURES_ECX_VMMCALL) ", %[mode]\n\t" \
"jg .Lvmcall%=\n\t" \
- "je .Lvmmcall%=\n\t" \
- ".Lport_call%=: movw %[port], %%dx\n\t" \
+ "je .Lvmmcall%=\n" \
+ ".Lport_call%=:\n\t" \
+ "movw %[port], %%dx\n\t" \
"inl (%%dx), %%eax\n\t" \
- "jmp .Lend%=\n\t" \
- ".Lvmmcall%=: vmmcall\n\t" \
- "jmp .Lend%=\n\t" \
- ".Lvmcall%=: vmcall\n\t" \
+ "jmp .Lend%=\n" \
+ ".Lvmmcall%=:\n\t" \
+ "vmmcall\n\t" \
+ "jmp .Lend%=\n" \
+ ".Lvmcall%=:\n\t" \
+ "vmcall\n" \
".Lend%=:"
static inline
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
^ permalink raw reply related
* Re: [PATCH AUTOSEL 6.9 31/35] HID: bpf: add in-tree HID-BPF fix for the HP Elite Presenter Mouse
From: Benjamin Tissoires @ 2024-05-27 14:50 UTC (permalink / raw)
To: Sasha Levin; +Cc: linux-kernel, stable, Peter Hutterer, jikos, linux-input, bpf
In-Reply-To: <20240527141214.3844331-31-sashal@kernel.org>
On May 27 2024, Sasha Levin wrote:
> From: Benjamin Tissoires <bentiss@kernel.org>
>
> [ Upstream commit 4e6d2a297dd5be26ad409b7a05b20bd033d1c95e ]
>
> Duplicate of commit 0db117359e47 ("HID: add quirk for 03f0:464a HP Elite
> Presenter Mouse"), but in a slightly better way.
>
> This time we actually change the application collection, making clearer
> for userspace what the second mouse is.
>
> Note that having both hid-quirks fix and this HID-BPF fix is not a
> problem at all.
Please drop this patch in all backports (and FWIW, any fix in drivers/hid/bpf/progs/).
HID-BPF is only available since kernel v6.3, and the compilation output
of the in-tree file is not used directly, but shipped from udev-hid-bpf.
TL;DR: this just adds noise to those stable kernel trees.
Cheers,
Benjamin
>
> Link: https://lore.kernel.org/r/20240410-bpf_sources-v1-4-a8bf16033ef8@kernel.org
> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> .../hid/bpf/progs/HP__Elite-Presenter.bpf.c | 58 +++++++++++++++++++
> 1 file changed, 58 insertions(+)
> create mode 100644 drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
>
> diff --git a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> new file mode 100644
> index 0000000000000..3d14bbb6f2762
> --- /dev/null
> +++ b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2023 Benjamin Tissoires
> + */
> +
> +#include "vmlinux.h"
> +#include "hid_bpf.h"
> +#include "hid_bpf_helpers.h"
> +#include <bpf/bpf_tracing.h>
> +
> +#define VID_HP 0x03F0
> +#define PID_ELITE_PRESENTER 0x464A
> +
> +HID_BPF_CONFIG(
> + HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_GENERIC, VID_HP, PID_ELITE_PRESENTER)
> +);
> +
> +/*
> + * Already fixed as of commit 0db117359e47 ("HID: add quirk for 03f0:464a
> + * HP Elite Presenter Mouse") in the kernel, but this is a slightly better
> + * fix.
> + *
> + * The HP Elite Presenter Mouse HID Record Descriptor shows
> + * two mice (Report ID 0x1 and 0x2), one keypad (Report ID 0x5),
> + * two Consumer Controls (Report IDs 0x6 and 0x3).
> + * Prior to these fixes it registers one mouse, one keypad
> + * and one Consumer Control, and it was usable only as a
> + * digital laser pointer (one of the two mouses).
> + * We replace the second mouse collection with a pointer collection,
> + * allowing to use the device both as a mouse and a digital laser
> + * pointer.
> + */
> +
> +SEC("fmod_ret/hid_bpf_rdesc_fixup")
> +int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
> +{
> + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
> +
> + if (!data)
> + return 0; /* EPERM check */
> +
> + /* replace application mouse by application pointer on the second collection */
> + if (data[79] == 0x02)
> + data[79] = 0x01;
> +
> + return 0;
> +}
> +
> +SEC("syscall")
> +int probe(struct hid_bpf_probe_args *ctx)
> +{
> + ctx->retval = ctx->rdesc_size != 264;
> + if (ctx->retval)
> + ctx->retval = -EINVAL;
> +
> + return 0;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> --
> 2.43.0
>
^ permalink raw reply
* Re: [PATCH AUTOSEL 6.8 27/30] HID: bpf: add in-tree HID-BPF fix for the HP Elite Presenter Mouse
From: Benjamin Tissoires @ 2024-05-27 14:49 UTC (permalink / raw)
To: Sasha Levin; +Cc: linux-kernel, stable, Peter Hutterer, jikos, linux-input, bpf
In-Reply-To: <20240527141406.3852821-27-sashal@kernel.org>
On May 27 2024, Sasha Levin wrote:
> From: Benjamin Tissoires <bentiss@kernel.org>
>
> [ Upstream commit 4e6d2a297dd5be26ad409b7a05b20bd033d1c95e ]
>
> Duplicate of commit 0db117359e47 ("HID: add quirk for 03f0:464a HP Elite
> Presenter Mouse"), but in a slightly better way.
>
> This time we actually change the application collection, making clearer
> for userspace what the second mouse is.
>
> Note that having both hid-quirks fix and this HID-BPF fix is not a
> problem at all.
Please drop this patch in all backports (and FWIW, any fix in drivers/hid/bpf/progs/).
HID-BPF is only available since kernel v6.3, and the compilation output
of the in-tree file is not used directly, but shipped from udev-hid-bpf.
TL;DR: this just adds noise to those stable kernel trees.
Cheers,
Benjamin
>
> Link: https://lore.kernel.org/r/20240410-bpf_sources-v1-4-a8bf16033ef8@kernel.org
> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> .../hid/bpf/progs/HP__Elite-Presenter.bpf.c | 58 +++++++++++++++++++
> 1 file changed, 58 insertions(+)
> create mode 100644 drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
>
> diff --git a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> new file mode 100644
> index 0000000000000..3d14bbb6f2762
> --- /dev/null
> +++ b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2023 Benjamin Tissoires
> + */
> +
> +#include "vmlinux.h"
> +#include "hid_bpf.h"
> +#include "hid_bpf_helpers.h"
> +#include <bpf/bpf_tracing.h>
> +
> +#define VID_HP 0x03F0
> +#define PID_ELITE_PRESENTER 0x464A
> +
> +HID_BPF_CONFIG(
> + HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_GENERIC, VID_HP, PID_ELITE_PRESENTER)
> +);
> +
> +/*
> + * Already fixed as of commit 0db117359e47 ("HID: add quirk for 03f0:464a
> + * HP Elite Presenter Mouse") in the kernel, but this is a slightly better
> + * fix.
> + *
> + * The HP Elite Presenter Mouse HID Record Descriptor shows
> + * two mice (Report ID 0x1 and 0x2), one keypad (Report ID 0x5),
> + * two Consumer Controls (Report IDs 0x6 and 0x3).
> + * Prior to these fixes it registers one mouse, one keypad
> + * and one Consumer Control, and it was usable only as a
> + * digital laser pointer (one of the two mouses).
> + * We replace the second mouse collection with a pointer collection,
> + * allowing to use the device both as a mouse and a digital laser
> + * pointer.
> + */
> +
> +SEC("fmod_ret/hid_bpf_rdesc_fixup")
> +int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
> +{
> + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
> +
> + if (!data)
> + return 0; /* EPERM check */
> +
> + /* replace application mouse by application pointer on the second collection */
> + if (data[79] == 0x02)
> + data[79] = 0x01;
> +
> + return 0;
> +}
> +
> +SEC("syscall")
> +int probe(struct hid_bpf_probe_args *ctx)
> +{
> + ctx->retval = ctx->rdesc_size != 264;
> + if (ctx->retval)
> + ctx->retval = -EINVAL;
> +
> + return 0;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> --
> 2.43.0
>
^ permalink raw reply
* Re: [PATCH AUTOSEL 6.6 20/21] HID: bpf: add in-tree HID-BPF fix for the HP Elite Presenter Mouse
From: Benjamin Tissoires @ 2024-05-27 14:49 UTC (permalink / raw)
To: Sasha Levin; +Cc: linux-kernel, stable, Peter Hutterer, jikos, linux-input, bpf
In-Reply-To: <20240527141551.3853516-20-sashal@kernel.org>
On May 27 2024, Sasha Levin wrote:
> From: Benjamin Tissoires <bentiss@kernel.org>
>
> [ Upstream commit 4e6d2a297dd5be26ad409b7a05b20bd033d1c95e ]
>
> Duplicate of commit 0db117359e47 ("HID: add quirk for 03f0:464a HP Elite
> Presenter Mouse"), but in a slightly better way.
>
> This time we actually change the application collection, making clearer
> for userspace what the second mouse is.
>
> Note that having both hid-quirks fix and this HID-BPF fix is not a
> problem at all.
Please drop this patch in all backports (and FWIW, any fix in drivers/hid/bpf/progs/).
HID-BPF is only available since kernel v6.3, and the compilation output
of the in-tree file is not used directly, but shipped from udev-hid-bpf.
TL;DR: this just adds noise to those stable kernel trees.
Cheers,
Benjamin
>
> Link: https://lore.kernel.org/r/20240410-bpf_sources-v1-4-a8bf16033ef8@kernel.org
> Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> .../hid/bpf/progs/HP__Elite-Presenter.bpf.c | 58 +++++++++++++++++++
> 1 file changed, 58 insertions(+)
> create mode 100644 drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
>
> diff --git a/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> new file mode 100644
> index 0000000000000..3d14bbb6f2762
> --- /dev/null
> +++ b/drivers/hid/bpf/progs/HP__Elite-Presenter.bpf.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2023 Benjamin Tissoires
> + */
> +
> +#include "vmlinux.h"
> +#include "hid_bpf.h"
> +#include "hid_bpf_helpers.h"
> +#include <bpf/bpf_tracing.h>
> +
> +#define VID_HP 0x03F0
> +#define PID_ELITE_PRESENTER 0x464A
> +
> +HID_BPF_CONFIG(
> + HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_GENERIC, VID_HP, PID_ELITE_PRESENTER)
> +);
> +
> +/*
> + * Already fixed as of commit 0db117359e47 ("HID: add quirk for 03f0:464a
> + * HP Elite Presenter Mouse") in the kernel, but this is a slightly better
> + * fix.
> + *
> + * The HP Elite Presenter Mouse HID Record Descriptor shows
> + * two mice (Report ID 0x1 and 0x2), one keypad (Report ID 0x5),
> + * two Consumer Controls (Report IDs 0x6 and 0x3).
> + * Prior to these fixes it registers one mouse, one keypad
> + * and one Consumer Control, and it was usable only as a
> + * digital laser pointer (one of the two mouses).
> + * We replace the second mouse collection with a pointer collection,
> + * allowing to use the device both as a mouse and a digital laser
> + * pointer.
> + */
> +
> +SEC("fmod_ret/hid_bpf_rdesc_fixup")
> +int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx)
> +{
> + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
> +
> + if (!data)
> + return 0; /* EPERM check */
> +
> + /* replace application mouse by application pointer on the second collection */
> + if (data[79] == 0x02)
> + data[79] = 0x01;
> +
> + return 0;
> +}
> +
> +SEC("syscall")
> +int probe(struct hid_bpf_probe_args *ctx)
> +{
> + ctx->retval = ctx->rdesc_size != 264;
> + if (ctx->retval)
> + ctx->retval = -EINVAL;
> +
> + return 0;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> --
> 2.43.0
>
^ permalink raw reply
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