[PATCH 1/3] remoteproc: Make coredump functionality configurable

Rishabh Bhatnagar
2020-04-16T18:39:31Z

Add a new file implementing coredump specific functionality.
This would enable clients to have the option to implement custom
dump functionality. The default coredump functionality remains same
as rproc_coredump function.

Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
---
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/remoteproc_core.c | 83 -----------------------
drivers/remoteproc/remoteproc_coredump.c | 111 +++++++++++++++++++++++++++++++
drivers/remoteproc/remoteproc_internal.h | 10 +++
4 files changed, 122 insertions(+), 83 deletions(-)
create mode 100644 drivers/remoteproc/remoteproc_coredump.c

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index e30a1b1..f1d1264 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -9,6 +9,7 @@ remoteproc-y += remoteproc_debugfs.o
remoteproc-y += remoteproc_sysfs.o
remoteproc-y += remoteproc_virtio.o
remoteproc-y += remoteproc_elf_loader.o
+remoteproc-y += remoteproc_coredump.o
obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
obj-$(CONFIG_MTK_SCP) += mtk_scp.o mtk_scp_ipi.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 097f33e..c0e9e5d 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1555,89 +1555,6 @@ int rproc_coredump_add_custom_segment(struct rproc *rproc,
EXPORT_SYMBOL(rproc_coredump_add_custom_segment);

/**
- * rproc_coredump() - perform coredump
- * @rproc: rproc handle
- *
- * This function will generate an ELF header for the registered segments
- * and create a devcoredump device associated with rproc.
- */
-static void rproc_coredump(struct rproc *rproc)
-{
- struct rproc_dump_segment *segment;
- struct elf32_phdr *phdr;
- struct elf32_hdr *ehdr;
- size_t data_size;
- size_t offset;
- void *data;
- void *ptr;
- int phnum = 0;
-
- if (list_empty(&rproc->dump_segments))
- return;
-
- data_size = sizeof(*ehdr);
- list_for_each_entry(segment, &rproc->dump_segments, node) {
- data_size += sizeof(*phdr) + segment->size;
-
- phnum++;
- }
-
- data = vmalloc(data_size);
- if (!data)
- return;
-
- ehdr = data;
-
- memset(ehdr, 0, sizeof(*ehdr));
- memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
- ehdr->e_ident[EI_CLASS] = ELFCLASS32;
- ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
- ehdr->e_ident[EI_VERSION] = EV_CURRENT;
- ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
- ehdr->e_type = ET_CORE;
- ehdr->e_machine = EM_NONE;
- ehdr->e_version = EV_CURRENT;
- ehdr->e_entry = rproc->bootaddr;
- ehdr->e_phoff = sizeof(*ehdr);
- ehdr->e_ehsize = sizeof(*ehdr);
- ehdr->e_phentsize = sizeof(*phdr);
- ehdr->e_phnum = phnum;
-
- phdr = data + ehdr->e_phoff;
- offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum;
- list_for_each_entry(segment, &rproc->dump_segments, node) {
- memset(phdr, 0, sizeof(*phdr));
- phdr->p_type = PT_LOAD;
- phdr->p_offset = offset;
- phdr->p_vaddr = segment->da;
- phdr->p_paddr = segment->da;
- phdr->p_filesz = segment->size;
- phdr->p_memsz = segment->size;
- phdr->p_flags = PF_R | PF_W | PF_X;
- phdr->p_align = 0;
-
- if (segment->dump) {
- segment->dump(rproc, segment, data + offset);
- } else {
- ptr = rproc_da_to_va(rproc, segment->da, segment->size);
- if (!ptr) {
- dev_err(&rproc->dev,
- "invalid coredump segment (%pad, %zu)\n",
- &segment->da, segment->size);
- memset(data + offset, 0xff, segment->size);
- } else {
- memcpy(data + offset, ptr, segment->size);
- }
- }
-
- offset += phdr->p_filesz;
- phdr++;
- }
-
- dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
-}
-
-/**
* rproc_trigger_recovery() - recover a remoteproc
* @rproc: the remote processor
*
diff --git a/drivers/remoteproc/remoteproc_coredump.c b/drivers/remoteproc/remoteproc_coredump.c
new file mode 100644
index 0000000..9de0467
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_coredump.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Coredump functionality for Remoteproc framework.
+ *
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/devcoredump.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/remoteproc.h>
+#include "remoteproc_internal.h"
+
+static void create_elf_header(void *data, int phnum, struct rproc *rproc)
+{
+ struct elf32_phdr *phdr;
+ struct elf32_hdr *ehdr;
+ struct rproc_dump_segment *segment;
+ int offset;
+
+ ehdr = data;
+
+ memset(ehdr, 0, sizeof(*ehdr));
+ memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
+ ehdr->e_ident[EI_CLASS] = ELFCLASS32;
+ ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
+ ehdr->e_ident[EI_VERSION] = EV_CURRENT;
+ ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
+ ehdr->e_type = ET_CORE;
+ ehdr->e_machine = EM_NONE;
+ ehdr->e_version = EV_CURRENT;
+ ehdr->e_entry = rproc->bootaddr;
+ ehdr->e_phoff = sizeof(*ehdr);
+ ehdr->e_ehsize = sizeof(*ehdr);
+ ehdr->e_phentsize = sizeof(*phdr);
+ ehdr->e_phnum = phnum;
+
+ phdr = data + ehdr->e_phoff;
+ offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum;
+ list_for_each_entry(segment, &rproc->dump_segments, node) {
+ memset(phdr, 0, sizeof(*phdr));
+ phdr->p_type = PT_LOAD;
+ phdr->p_offset = offset;
+ phdr->p_vaddr = segment->da;
+ phdr->p_paddr = segment->da;
+ phdr->p_filesz = segment->size;
+ phdr->p_memsz = segment->size;
+ phdr->p_flags = PF_R | PF_W | PF_X;
+ phdr->p_align = 0;
+
+ offset += phdr->p_filesz;
+ phdr++;
+ }
+}
+
+/**
+ * rproc_default_coredump() - perform coredump
+ * @rproc: rproc handle
+ *
+ * This function will generate an ELF header for the registered segments
+ * and create a devcoredump device associated with rproc.
+ */
+void rproc_default_coredump(struct rproc *rproc)
+{
+ struct rproc_dump_segment *segment;
+ struct elf32_phdr *phdr;
+ struct elf32_hdr *ehdr;
+ size_t data_size;
+ void *data, *ptr;
+ int offset, phnum = 0;
+
+ if (list_empty(&rproc->dump_segments))
+ return;
+
+ data_size = sizeof(*ehdr);
+ list_for_each_entry(segment, &rproc->dump_segments, node) {
+ data_size += sizeof(*phdr) + segment->size;
+
+ phnum++;
+ }
+
+ data = vmalloc(data_size);
+ if (!data)
+ return;
+
+ ehdr = data;
+ create_elf_header(data, phnum, rproc);
+
+ phdr = data + ehdr->e_phoff;
+ offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum;
+ list_for_each_entry(segment, &rproc->dump_segments, node) {
+ if (segment->dump) {
+ segment->dump(rproc, segment, data + offset);
+ } else {
+ ptr = rproc_da_to_va(rproc, segment->da, segment->size);
+ if (!ptr) {
+ dev_err(&rproc->dev,
+ "invalid coredump segment (%pad, %zu)\n",
+ &segment->da, segment->size);
+ memset(data + offset, 0xff, segment->size);
+ } else {
+ memcpy(data + offset, ptr, segment->size);
+ }
+ }
+ phdr++;
+ }
+
+ dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
+}
+EXPORT_SYMBOL(rproc_default_coredump);
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 493ef92..28b6af2 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -47,6 +47,9 @@ struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
int rproc_init_sysfs(void);
void rproc_exit_sysfs(void);

+/* from remoteproc_coredump.c */
+void rproc_default_coredump(struct rproc *rproc);
+
void rproc_free_vring(struct rproc_vring *rvring);
int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);

@@ -119,4 +122,11 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
return NULL;
}

+static inline
+void rproc_coredump(struct rproc *rproc)
+{
+ return rproc_default_coredump(rproc);
+
+}
+
#endif /* REMOTEPROC_INTERNAL_H */
--
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