* [PATCH v5 1/3] of: Make device nodes kobjects so they show up in sysfs
[not found] ` <1384537604-5032-1-git-send-email-grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
@ 2013-11-15 17:46 ` Grant Likely
2013-11-15 17:46 ` [PATCH v5 2/3] of/selftest: Add self tests for manipulation of properties Grant Likely
2013-11-15 17:46 ` [PATCH v5 3/3] of: remove /proc/device-tree Grant Likely
2 siblings, 0 replies; 8+ messages in thread
From: Grant Likely @ 2013-11-15 17:46 UTC (permalink / raw)
To: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: Grant Likely, Rob Herring, Benjamin Herrenschmidt,
David S. Miller, Nathan Fontenot, Pantelis Antoniou
From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Device tree nodes are already treated as objects, and we already want to
expose them to userspace which is done using the /proc filesystem today.
Right now the kernel has to do a lot of work to keep the /proc view in
sync with the in-kernel representation. If device_nodes are switched to
be kobjects then the device tree code can be a whole lot simpler. It
also turns out that switching to using /sysfs from /proc results in
smaller code and data size, and the userspace ABI won't change if
/proc/device-tree symlinks to /sys/firmware/devicetree/base.
v5: Rename firmware/ofw to firmware/devicetree
Fix updating property values in sysfs
v4: Fixed build error on Powerpc
Fixed handling of dynamic nodes on powerpc
v3: Fixed handling of duplicate attribute and child node names
v2: switch to using sysfs bin_attributes which solve the problem of
reporting incorrect property size.
Signed-off-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Tested-by: Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Nathan Fontenot <nfont-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: Pantelis Antoniou <panto-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
---
Documentation/ABI/testing/sysfs-firmware-ofw | 28 +++++
arch/arm/boot/dts/testcases/tests-phandle.dtsi | 3 +
arch/powerpc/platforms/pseries/dlpar.c | 1 -
arch/powerpc/platforms/pseries/reconfig.c | 2 -
arch/powerpc/sysdev/msi_bitmap.c | 2 +-
drivers/of/base.c | 157 +++++++++++++++++++++++--
drivers/of/fdt.c | 3 +-
drivers/of/pdt.c | 4 +-
include/linux/of.h | 9 +-
9 files changed, 193 insertions(+), 16 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-firmware-ofw
diff --git a/Documentation/ABI/testing/sysfs-firmware-ofw b/Documentation/ABI/testing/sysfs-firmware-ofw
new file mode 100644
index 000000000000..f562b188e71d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-ofw
@@ -0,0 +1,28 @@
+What: /sys/firmware/devicetree/*
+Date: November 2013
+Contact: Grant Likely <grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
+Description:
+ When using OpenFirmware or a Flattened Device Tree to enumerate
+ hardware, the device tree structure will be exposed in this
+ directory.
+
+ It is possible for multiple device-tree directories to exist.
+ Some device drivers use a separate detached device tree which
+ have no attachment to the system tree and will appear in a
+ different subdirectory under /sys/firmware/devicetree.
+
+ Userspace must not use the /sys/firmware/devicetree/base
+ path directly, but instead should follow /proc/device-tree
+ symlink. It is possible that the absolute path will change
+ in the future, but the symlink is the stable ABI.
+
+ The /proc/device-tree symlink replaces the devicetree /proc
+ filesystem support, and has largely the same semantics and
+ should be compatible with existing userspace.
+
+ The contents of /sys/firmware/devicetree/ is a
+ hierarchy of directories, one per device tree node. The
+ directory name is the resolved path component name (node
+ name plus address). Properties are represented as files
+ in the directory. The contents of each file is the exact
+ binary data from the device tree.
diff --git a/arch/arm/boot/dts/testcases/tests-phandle.dtsi b/arch/arm/boot/dts/testcases/tests-phandle.dtsi
index 0007d3cd7dc2..788a4c24b8f5 100644
--- a/arch/arm/boot/dts/testcases/tests-phandle.dtsi
+++ b/arch/arm/boot/dts/testcases/tests-phandle.dtsi
@@ -1,6 +1,9 @@
/ {
testcase-data {
+ security-password = "password";
+ duplicate-name = "duplicate";
+ duplicate-name { };
phandle-tests {
provider0: provider0 {
#phandle-cells = <0>;
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index a8fe5aa3d34f..397661de19ec 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -11,7 +11,6 @@
*/
#include <linux/kernel.h>
-#include <linux/kref.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
index f93cdf55628c..0435bb65d0aa 100644
--- a/arch/powerpc/platforms/pseries/reconfig.c
+++ b/arch/powerpc/platforms/pseries/reconfig.c
@@ -12,7 +12,6 @@
*/
#include <linux/kernel.h>
-#include <linux/kref.h>
#include <linux/notifier.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
@@ -70,7 +69,6 @@ static int pSeries_reconfig_add_node(const char *path, struct property *proplist
np->properties = proplist;
of_node_set_flag(np, OF_DYNAMIC);
- kref_init(&np->kref);
np->parent = derive_parent(path);
if (IS_ERR(np->parent)) {
diff --git a/arch/powerpc/sysdev/msi_bitmap.c b/arch/powerpc/sysdev/msi_bitmap.c
index 0968b66b4cf9..8ba60424be95 100644
--- a/arch/powerpc/sysdev/msi_bitmap.c
+++ b/arch/powerpc/sysdev/msi_bitmap.c
@@ -202,7 +202,7 @@ void __init test_of_node(void)
/* There should really be a struct device_node allocator */
memset(&of_node, 0, sizeof(of_node));
- kref_init(&of_node.kref);
+ kref_init(&of_node.kobj.kref);
of_node.full_name = node_name;
check(0 == msi_bitmap_alloc(&bmp, size, &of_node));
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 967b3209907a..efcfead5ba2d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -23,6 +23,7 @@
#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include <linux/proc_fs.h>
#include "of_private.h"
@@ -35,6 +36,12 @@ struct device_node *of_chosen;
struct device_node *of_aliases;
static struct device_node *of_stdout;
+static struct kset *of_kset;
+
+/*
+ * Used to protect the of_aliases; but also overloaded to hold off addition of
+ * nodes to sysfs
+ */
DEFINE_MUTEX(of_aliases_mutex);
/* use when traversing tree through the allnext, child, sibling,
@@ -92,14 +99,14 @@ int __weak of_node_to_nid(struct device_node *np)
struct device_node *of_node_get(struct device_node *node)
{
if (node)
- kref_get(&node->kref);
+ kobject_get(&node->kobj);
return node;
}
EXPORT_SYMBOL(of_node_get);
-static inline struct device_node *kref_to_device_node(struct kref *kref)
+static inline struct device_node *kobj_to_device_node(struct kobject *kobj)
{
- return container_of(kref, struct device_node, kref);
+ return container_of(kobj, struct device_node, kobj);
}
/**
@@ -109,16 +116,15 @@ static inline struct device_node *kref_to_device_node(struct kref *kref)
* In of_node_put() this function is passed to kref_put()
* as the destructor.
*/
-static void of_node_release(struct kref *kref)
+static void of_node_release(struct kobject *kobj)
{
- struct device_node *node = kref_to_device_node(kref);
+ struct device_node *node = kobj_to_device_node(kobj);
struct property *prop = node->properties;
/* We should never be releasing nodes that haven't been detached. */
if (!of_node_check_flag(node, OF_DETACHED)) {
pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name);
dump_stack();
- kref_init(&node->kref);
return;
}
@@ -151,11 +157,138 @@ static void of_node_release(struct kref *kref)
void of_node_put(struct device_node *node)
{
if (node)
- kref_put(&node->kref, of_node_release);
+ kobject_put(&node->kobj);
}
EXPORT_SYMBOL(of_node_put);
+#else
+static void of_node_release(struct kobject *kobj)
+{
+ /* Without CONFIG_OF_DYNAMIC, no nodes gets freed */
+}
#endif /* CONFIG_OF_DYNAMIC */
+struct kobj_type of_node_ktype = {
+ .release = of_node_release,
+};
+
+static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t offset, size_t count)
+{
+ struct property *pp = container_of(bin_attr, struct property, attr);
+ return memory_read_from_buffer(buf, count, &offset, pp->value, pp->length);
+}
+
+static const char *safe_name(struct kobject *kobj, const char *orig_name)
+{
+ const char *name = orig_name;
+ struct sysfs_dirent *sd;
+ int i = 0;
+
+ /* don't be a hero. After 16 tries give up */
+ while (i < 16 && (sd = sysfs_get_dirent(kobj->sd, name))) {
+ sysfs_put(sd);
+ if (name != orig_name)
+ kfree(name);
+ name = kasprintf(GFP_KERNEL, "%s#%i", orig_name, ++i);
+ }
+
+ if (name != orig_name)
+ pr_warn("device-tree: Duplicate name in %s, renamed to \"%s\"\n",
+ kobject_name(kobj), name);
+ return name;
+}
+
+static int __of_add_property(struct device_node *np, struct property *pp)
+{
+ int rc;
+
+ /* Important: Don't leak passwords */
+ bool secure = strncmp(pp->name, "security-", 9) == 0;
+
+ pp->attr.attr.name = safe_name(&np->kobj, pp->name);
+ pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO;
+ pp->attr.size = secure ? 0 : pp->length;
+ pp->attr.read = of_node_property_read;
+
+ rc = sysfs_create_bin_file(&np->kobj, &pp->attr);
+ WARN(rc, "error adding attribute %s to node %s\n", pp->name, np->full_name);
+ return rc;
+}
+
+static int __of_node_add(struct device_node *np)
+{
+ const char *name;
+ struct property *pp;
+ int rc;
+
+ np->kobj.kset = of_kset;
+ if (!np->parent) {
+ /* Nodes without parents are new top level trees */
+ rc = kobject_add(&np->kobj, NULL, safe_name(&of_kset->kobj, "base"));
+ } else {
+ name = safe_name(&np->parent->kobj, kbasename(np->full_name));
+ if (!name || !name[0])
+ return -EINVAL;
+
+ rc = kobject_add(&np->kobj, &np->parent->kobj, "%s", name);
+ }
+ if (rc)
+ return rc;
+
+ for_each_property_of_node(np, pp)
+ __of_add_property(np, pp);
+
+ return 0;
+}
+
+int of_node_add(struct device_node *np)
+{
+ int rc = 0;
+ kobject_init(&np->kobj, &of_node_ktype);
+ mutex_lock(&of_aliases_mutex);
+ if (of_kset)
+ rc = __of_node_add(np);
+ mutex_unlock(&of_aliases_mutex);
+ return rc;
+}
+
+#if defined(CONFIG_OF_DYNAMIC)
+static void of_node_remove(struct device_node *np)
+{
+ struct property *pp;
+
+ for_each_property_of_node(np, pp)
+ sysfs_remove_bin_file(&np->kobj, &pp->attr);
+
+ kobject_del(&np->kobj);
+}
+#endif
+
+static int __init of_init(void)
+{
+ struct device_node *np;
+
+ of_kset = kset_create_and_add("devicetree", NULL, firmware_kobj);
+ if (!of_kset)
+ return -ENOMEM;
+
+ /* Make sure all nodes added before this time get added to sysfs */
+ mutex_lock(&of_aliases_mutex);
+ for_each_of_allnodes(np)
+ __of_node_add(np);
+ mutex_unlock(&of_aliases_mutex);
+
+#if !defined(CONFIG_PROC_DEVICETREE)
+ /* Symlink to the new tree when PROC_DEVICETREE is disabled */
+ if (of_allnodes)
+ proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base");
+#endif /* CONFIG_PROC_DEVICETREE */
+
+ return 0;
+}
+core_initcall(of_init);
+
static struct property *__of_find_property(const struct device_node *np,
const char *name, int *lenp)
{
@@ -1495,6 +1628,8 @@ int of_add_property(struct device_node *np, struct property *prop)
*next = prop;
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ __of_add_property(np, prop);
+
#ifdef CONFIG_PROC_DEVICETREE
/* try to add to proc as well if it was initialized */
if (np->pde)
@@ -1541,6 +1676,8 @@ int of_remove_property(struct device_node *np, struct property *prop)
if (!found)
return -ENODEV;
+ sysfs_remove_bin_file(&np->kobj, &prop->attr);
+
#ifdef CONFIG_PROC_DEVICETREE
/* try to remove the proc node as well */
if (np->pde)
@@ -1595,6 +1732,10 @@ int of_update_property(struct device_node *np, struct property *newprop)
if (!found)
return -ENODEV;
+ /* Update the sysfs attribute */
+ sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
+ __of_add_property(np, newprop);
+
#ifdef CONFIG_PROC_DEVICETREE
/* try to add to proc as well if it was initialized */
if (np->pde)
@@ -1671,6 +1812,7 @@ int of_attach_node(struct device_node *np)
of_node_clear_flag(np, OF_DETACHED);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ of_node_add(np);
of_add_proc_dt_entry(np);
return 0;
}
@@ -1743,6 +1885,7 @@ int of_detach_node(struct device_node *np)
raw_spin_unlock_irqrestore(&devtree_lock, flags);
of_remove_proc_dt_entry(np);
+ of_node_remove(np);
return rc;
}
#endif /* defined(CONFIG_OF_DYNAMIC) */
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 2fa024b97c43..d5d62cd5680f 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -232,7 +232,6 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
dad->next->sibling = np;
dad->next = np;
}
- kref_init(&np->kref);
}
/* process properties */
while (1) {
@@ -327,6 +326,8 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
np->name = "<NULL>";
if (!np->type)
np->type = "<NULL>";
+
+ of_node_add(np);
}
while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
if (tag == OF_DT_NOP)
diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
index 7b666736c168..e64fa3d3da5f 100644
--- a/drivers/of/pdt.c
+++ b/drivers/of/pdt.c
@@ -179,8 +179,6 @@ static struct device_node * __init of_pdt_create_node(phandle node,
of_pdt_incr_unique_id(dp);
dp->parent = parent;
- kref_init(&dp->kref);
-
dp->name = of_pdt_get_one_property(node, "name");
dp->type = of_pdt_get_one_property(node, "device_type");
dp->phandle = node;
@@ -215,6 +213,7 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
*nextp = &dp->allnext;
dp->full_name = of_pdt_build_full_name(dp);
+ of_node_add(dp);
dp->child = of_pdt_build_tree(dp,
of_pdt_prom_ops->getchild(node), nextp);
@@ -245,6 +244,7 @@ void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
of_allnodes->path_component_name = "";
#endif
of_allnodes->full_name = "/";
+ of_node_add(of_allnodes);
nextp = &of_allnodes->allnext;
of_allnodes->child = of_pdt_build_tree(of_allnodes,
diff --git a/include/linux/of.h b/include/linux/of.h
index a4b7fdf17044..c899a89de9a8 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -18,7 +18,7 @@
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/errno.h>
-#include <linux/kref.h>
+#include <linux/kobject.h>
#include <linux/mod_devicetable.h>
#include <linux/spinlock.h>
#include <linux/topology.h>
@@ -37,6 +37,7 @@ struct property {
struct property *next;
unsigned long _flags;
unsigned int unique_id;
+ struct bin_attribute attr;
};
#if defined(CONFIG_SPARC)
@@ -57,7 +58,7 @@ struct device_node {
struct device_node *next; /* next device of same type */
struct device_node *allnext; /* next in list of all nodes */
struct proc_dir_entry *pde; /* this node's proc directory */
- struct kref kref;
+ struct kobject kobj;
unsigned long _flags;
void *data;
#if defined(CONFIG_SPARC)
@@ -74,6 +75,8 @@ struct of_phandle_args {
uint32_t args[MAX_PHANDLE_ARGS];
};
+extern int of_node_add(struct device_node *node);
+
#ifdef CONFIG_OF_DYNAMIC
extern struct device_node *of_node_get(struct device_node *node);
extern void of_node_put(struct device_node *node);
@@ -187,6 +190,8 @@ static inline const char *of_node_full_name(const struct device_node *np)
return np ? np->full_name : "<no-node>";
}
+#define for_each_of_allnodes(dn) \
+ for (dn = of_allnodes; dn; dn = dn->allnext)
extern struct device_node *of_find_node_by_name(struct device_node *from,
const char *name);
#define for_each_node_by_name(dn, name) \
--
1.8.3.2
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^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v5 2/3] of/selftest: Add self tests for manipulation of properties
[not found] ` <1384537604-5032-1-git-send-email-grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2013-11-15 17:46 ` [PATCH v5 1/3] of: Make device nodes kobjects so they show up in sysfs Grant Likely
@ 2013-11-15 17:46 ` Grant Likely
[not found] ` <1384537604-5032-3-git-send-email-grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2013-11-15 17:46 ` [PATCH v5 3/3] of: remove /proc/device-tree Grant Likely
2 siblings, 1 reply; 8+ messages in thread
From: Grant Likely @ 2013-11-15 17:46 UTC (permalink / raw)
To: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: Grant Likely, Rob Herring, Benjamin Herrenschmidt,
David S. Miller, Nathan Fontenot, Pantelis Antoniou
Adds a few simple test cases to ensure that addition, update and removal
of device tree node properties works correctly.
Signed-off-by: Grant Likely <grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Nathan Fontenot <nfont-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: Pantelis Antoniou <panto-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
---
drivers/of/selftest.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index e21012bde639..cb8d3e722f76 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -30,6 +30,67 @@ static struct selftest_results {
} \
}
+static void __init of_selftest_dynamic(void)
+{
+ struct device_node *np;
+ struct property *prop;
+
+ np = of_find_node_by_path("/testcase-data");
+ if (!np) {
+ pr_err("missing testcase data\n");
+ return;
+ }
+
+ /* Array of 4 properties for the purpose of testing */
+ prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
+ if (!prop) {
+ selftest(0, "kzalloc() failed\n");
+ return;
+ }
+
+ /* Add a new property - should pass*/
+ prop->name = "new-property";
+ prop->value = "new-property-data";
+ prop->length = strlen(prop->value);
+ selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
+
+ /* Try to add an existing property - should fail */
+ prop++;
+ prop->name = "new-property";
+ prop->value = "new-property-data-should-fail";
+ prop->length = strlen(prop->value);
+ selftest(of_add_property(np, prop) != 0,
+ "Adding an existing property should have failed\n");
+
+ /* Try to modify an existing property - should pass */
+ prop->value = "modify-property-data-should-pass";
+ prop->length = strlen(prop->value);
+ selftest(of_update_property(np, prop) == 0,
+ "Updating an existing property should have passed\n");
+
+ /* Try to modify non-existent property - should pass*/
+ prop++;
+ prop->name = "modify-property";
+ prop->value = "modify-missing-property-data-should-pass";
+ prop->length = strlen(prop->value);
+ selftest(of_update_property(np, prop) == 0,
+ "Updating a missing property should have passed\n");
+
+ /* Remove property - should pass */
+ selftest(of_remove_property(np, prop) == 0,
+ "Removing a property should have passed\n");
+
+ /* Adding very large property - should pass */
+ prop++;
+ prop->name = "large-property-PAGE_SIZEx8";
+ prop->length = PAGE_SIZE * 8;
+ prop->value = kzalloc(prop->length, GFP_KERNEL);
+ selftest(prop->value != NULL, "Unable to allocate large buffer\n");
+ if (prop->value)
+ selftest(of_add_property(np, prop) == 0,
+ "Adding a large property should have passed\n");
+}
+
static void __init of_selftest_parse_phandle_with_args(void)
{
struct device_node *np;
@@ -312,6 +373,7 @@ static int __init of_selftest(void)
of_node_put(np);
pr_info("start of selftest - you will see error messages\n");
+ of_selftest_dynamic();
of_selftest_parse_phandle_with_args();
of_selftest_property_match_string();
of_selftest_parse_interrupts();
--
1.8.3.2
--
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^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v5 3/3] of: remove /proc/device-tree
[not found] ` <1384537604-5032-1-git-send-email-grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2013-11-15 17:46 ` [PATCH v5 1/3] of: Make device nodes kobjects so they show up in sysfs Grant Likely
2013-11-15 17:46 ` [PATCH v5 2/3] of/selftest: Add self tests for manipulation of properties Grant Likely
@ 2013-11-15 17:46 ` Grant Likely
2 siblings, 0 replies; 8+ messages in thread
From: Grant Likely @ 2013-11-15 17:46 UTC (permalink / raw)
To: devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: Grant Likely, Rob Herring, Benjamin Herrenschmidt,
David S. Miller, Nathan Fontenot, Pantelis Antoniou
From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
The same data is now available in sysfs, so we can remove the code
that exports it in /proc and replace it with a symlink to the sysfs
version.
Tested on versatile qemu model and mpc5200 eval board. More testing
would be appreciated.
v5: Fixed up conflicts with mainline changes
Signed-off-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Cc: David S. Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Nathan Fontenot <nfont-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: Pantelis Antoniou <panto-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
---
drivers/of/Kconfig | 8 --
drivers/of/base.c | 52 +----------
fs/proc/Makefile | 1 -
fs/proc/internal.h | 7 --
fs/proc/proc_devtree.c | 240 -------------------------------------------------
fs/proc/root.c | 3 -
include/linux/of.h | 11 ---
7 files changed, 1 insertion(+), 321 deletions(-)
delete mode 100644 fs/proc/proc_devtree.c
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index de6f8990246f..46e211e2bc51 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -7,14 +7,6 @@ config OF
menu "Device Tree and Open Firmware support"
depends on OF
-config PROC_DEVICETREE
- bool "Support for device tree in /proc"
- depends on PROC_FS && !SPARC
- help
- This option adds a device-tree directory under /proc which contains
- an image of the device tree that the kernel copies from Open
- Firmware or other boot firmware. If unsure, say Y here.
-
config OF_SELFTEST
bool "Device Tree Runtime self tests"
depends on OF_IRQ
diff --git a/drivers/of/base.c b/drivers/of/base.c
index efcfead5ba2d..4f76d5ff53aa 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -279,11 +279,9 @@ static int __init of_init(void)
__of_node_add(np);
mutex_unlock(&of_aliases_mutex);
-#if !defined(CONFIG_PROC_DEVICETREE)
- /* Symlink to the new tree when PROC_DEVICETREE is disabled */
+ /* Symlink in /proc as required by userspace ABI */
if (of_allnodes)
proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base");
-#endif /* CONFIG_PROC_DEVICETREE */
return 0;
}
@@ -1630,12 +1628,6 @@ int of_add_property(struct device_node *np, struct property *prop)
__of_add_property(np, prop);
-#ifdef CONFIG_PROC_DEVICETREE
- /* try to add to proc as well if it was initialized */
- if (np->pde)
- proc_device_tree_add_prop(np->pde, prop);
-#endif /* CONFIG_PROC_DEVICETREE */
-
return 0;
}
@@ -1678,12 +1670,6 @@ int of_remove_property(struct device_node *np, struct property *prop)
sysfs_remove_bin_file(&np->kobj, &prop->attr);
-#ifdef CONFIG_PROC_DEVICETREE
- /* try to remove the proc node as well */
- if (np->pde)
- proc_device_tree_remove_prop(np->pde, prop);
-#endif /* CONFIG_PROC_DEVICETREE */
-
return 0;
}
@@ -1736,12 +1722,6 @@ int of_update_property(struct device_node *np, struct property *newprop)
sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
__of_add_property(np, newprop);
-#ifdef CONFIG_PROC_DEVICETREE
- /* try to add to proc as well if it was initialized */
- if (np->pde)
- proc_device_tree_update_prop(np->pde, newprop, oldprop);
-#endif /* CONFIG_PROC_DEVICETREE */
-
return 0;
}
@@ -1776,22 +1756,6 @@ int of_reconfig_notify(unsigned long action, void *p)
return notifier_to_errno(rc);
}
-#ifdef CONFIG_PROC_DEVICETREE
-static void of_add_proc_dt_entry(struct device_node *dn)
-{
- struct proc_dir_entry *ent;
-
- ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
- if (ent)
- proc_device_tree_add_node(dn, ent);
-}
-#else
-static void of_add_proc_dt_entry(struct device_node *dn)
-{
- return;
-}
-#endif
-
/**
* of_attach_node - Plug a device node into the tree and global list.
*/
@@ -1813,22 +1777,9 @@ int of_attach_node(struct device_node *np)
raw_spin_unlock_irqrestore(&devtree_lock, flags);
of_node_add(np);
- of_add_proc_dt_entry(np);
return 0;
}
-#ifdef CONFIG_PROC_DEVICETREE
-static void of_remove_proc_dt_entry(struct device_node *dn)
-{
- proc_remove(dn->pde);
-}
-#else
-static void of_remove_proc_dt_entry(struct device_node *dn)
-{
- return;
-}
-#endif
-
/**
* of_detach_node - "Unplug" a node from the device tree.
*
@@ -1884,7 +1835,6 @@ int of_detach_node(struct device_node *np)
of_node_set_flag(np, OF_DETACHED);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- of_remove_proc_dt_entry(np);
of_node_remove(np);
return rc;
}
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index ab30716584f5..239493ec718e 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -27,6 +27,5 @@ proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o
proc-$(CONFIG_NET) += proc_net.o
proc-$(CONFIG_PROC_KCORE) += kcore.o
proc-$(CONFIG_PROC_VMCORE) += vmcore.o
-proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o
proc-$(CONFIG_PRINTK) += kmsg.o
proc-$(CONFIG_PROC_PAGE_MONITOR) += page.o
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 651d09a11dde..3ab6d14e71c5 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -211,13 +211,6 @@ extern int proc_fill_super(struct super_block *);
extern void proc_entry_rundown(struct proc_dir_entry *);
/*
- * proc_devtree.c
- */
-#ifdef CONFIG_PROC_DEVICETREE
-extern void proc_device_tree_init(void);
-#endif
-
-/*
* proc_namespaces.c
*/
extern const struct inode_operations proc_ns_dir_inode_operations;
diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
deleted file mode 100644
index 70779b2fc209..000000000000
--- a/fs/proc/proc_devtree.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * proc_devtree.c - handles /proc/device-tree
- *
- * Copyright 1997 Paul Mackerras
- */
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/time.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/printk.h>
-#include <linux/stat.h>
-#include <linux/string.h>
-#include <linux/of.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <asm/uaccess.h>
-#include "internal.h"
-
-static inline void set_node_proc_entry(struct device_node *np,
- struct proc_dir_entry *de)
-{
- np->pde = de;
-}
-
-static struct proc_dir_entry *proc_device_tree;
-
-/*
- * Supply data on a read from /proc/device-tree/node/property.
- */
-static int property_proc_show(struct seq_file *m, void *v)
-{
- struct property *pp = m->private;
-
- seq_write(m, pp->value, pp->length);
- return 0;
-}
-
-static int property_proc_open(struct inode *inode, struct file *file)
-{
- return single_open(file, property_proc_show, __PDE_DATA(inode));
-}
-
-static const struct file_operations property_proc_fops = {
- .owner = THIS_MODULE,
- .open = property_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-/*
- * For a node with a name like "gc@10", we make symlinks called "gc"
- * and "@10" to it.
- */
-
-/*
- * Add a property to a node
- */
-static struct proc_dir_entry *
-__proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp,
- const char *name)
-{
- struct proc_dir_entry *ent;
-
- /*
- * Unfortunately proc_register puts each new entry
- * at the beginning of the list. So we rearrange them.
- */
- ent = proc_create_data(name,
- strncmp(name, "security-", 9) ? S_IRUGO : S_IRUSR,
- de, &property_proc_fops, pp);
- if (ent == NULL)
- return NULL;
-
- if (!strncmp(name, "security-", 9))
- ent->size = 0; /* don't leak number of password chars */
- else
- ent->size = pp->length;
-
- return ent;
-}
-
-
-void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop)
-{
- __proc_device_tree_add_prop(pde, prop, prop->name);
-}
-
-void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
- struct property *prop)
-{
- remove_proc_entry(prop->name, pde);
-}
-
-void proc_device_tree_update_prop(struct proc_dir_entry *pde,
- struct property *newprop,
- struct property *oldprop)
-{
- struct proc_dir_entry *ent;
-
- if (!oldprop) {
- proc_device_tree_add_prop(pde, newprop);
- return;
- }
-
- for (ent = pde->subdir; ent != NULL; ent = ent->next)
- if (ent->data == oldprop)
- break;
- if (ent == NULL) {
- pr_warn("device-tree: property \"%s\" does not exist\n",
- oldprop->name);
- } else {
- ent->data = newprop;
- ent->size = newprop->length;
- }
-}
-
-/*
- * Various dodgy firmware might give us nodes and/or properties with
- * conflicting names. That's generally ok, except for exporting via /proc,
- * so munge names here to ensure they're unique.
- */
-
-static int duplicate_name(struct proc_dir_entry *de, const char *name)
-{
- struct proc_dir_entry *ent;
- int found = 0;
-
- spin_lock(&proc_subdir_lock);
-
- for (ent = de->subdir; ent != NULL; ent = ent->next) {
- if (strcmp(ent->name, name) == 0) {
- found = 1;
- break;
- }
- }
-
- spin_unlock(&proc_subdir_lock);
-
- return found;
-}
-
-static const char *fixup_name(struct device_node *np, struct proc_dir_entry *de,
- const char *name)
-{
- char *fixed_name;
- int fixup_len = strlen(name) + 2 + 1; /* name + #x + \0 */
- int i = 1, size;
-
-realloc:
- fixed_name = kmalloc(fixup_len, GFP_KERNEL);
- if (fixed_name == NULL) {
- pr_err("device-tree: Out of memory trying to fixup "
- "name \"%s\"\n", name);
- return name;
- }
-
-retry:
- size = snprintf(fixed_name, fixup_len, "%s#%d", name, i);
- size++; /* account for NULL */
-
- if (size > fixup_len) {
- /* We ran out of space, free and reallocate. */
- kfree(fixed_name);
- fixup_len = size;
- goto realloc;
- }
-
- if (duplicate_name(de, fixed_name)) {
- /* Multiple duplicates. Retry with a different offset. */
- i++;
- goto retry;
- }
-
- pr_warn("device-tree: Duplicate name in %s, renamed to \"%s\"\n",
- np->full_name, fixed_name);
-
- return fixed_name;
-}
-
-/*
- * Process a node, adding entries for its children and its properties.
- */
-void proc_device_tree_add_node(struct device_node *np,
- struct proc_dir_entry *de)
-{
- struct property *pp;
- struct proc_dir_entry *ent;
- struct device_node *child;
- const char *p;
-
- set_node_proc_entry(np, de);
- for (child = NULL; (child = of_get_next_child(np, child));) {
- /* Use everything after the last slash, or the full name */
- p = kbasename(child->full_name);
-
- if (duplicate_name(de, p))
- p = fixup_name(np, de, p);
-
- ent = proc_mkdir(p, de);
- if (ent == NULL)
- break;
- proc_device_tree_add_node(child, ent);
- }
- of_node_put(child);
-
- for (pp = np->properties; pp != NULL; pp = pp->next) {
- p = pp->name;
-
- if (strchr(p, '/'))
- continue;
-
- if (duplicate_name(de, p))
- p = fixup_name(np, de, p);
-
- ent = __proc_device_tree_add_prop(de, pp, p);
- if (ent == NULL)
- break;
- }
-}
-
-/*
- * Called on initialization to set up the /proc/device-tree subtree
- */
-void __init proc_device_tree_init(void)
-{
- struct device_node *root;
-
- proc_device_tree = proc_mkdir("device-tree", NULL);
- if (proc_device_tree == NULL)
- return;
- root = of_find_node_by_path("/");
- if (root == NULL) {
- pr_debug("/proc/device-tree: can't find root\n");
- return;
- }
- proc_device_tree_add_node(root, proc_device_tree);
- of_node_put(root);
-}
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 87dbcbef7fe4..7bbeb5257af1 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -183,9 +183,6 @@ void __init proc_root_init(void)
proc_mkdir("openprom", NULL);
#endif
proc_tty_init();
-#ifdef CONFIG_PROC_DEVICETREE
- proc_device_tree_init();
-#endif
proc_mkdir("bus", NULL);
proc_sys_init();
}
diff --git a/include/linux/of.h b/include/linux/of.h
index c899a89de9a8..06d32ad62bc0 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -57,7 +57,6 @@ struct device_node {
struct device_node *sibling;
struct device_node *next; /* next device of same type */
struct device_node *allnext; /* next in list of all nodes */
- struct proc_dir_entry *pde; /* this node's proc directory */
struct kobject kobj;
unsigned long _flags;
void *data;
@@ -638,14 +637,4 @@ static inline int of_property_read_u32(const struct device_node *np,
s; \
s = of_prop_next_string(prop, s))
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
-extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
-extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
-extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
- struct property *prop);
-extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
- struct property *newprop,
- struct property *oldprop);
-#endif
-
#endif /* _LINUX_OF_H */
--
1.8.3.2
--
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^ permalink raw reply related [flat|nested] 8+ messages in thread