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remoteproc: Move coredump functionality to a new file

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Move all coredump functionality to an individual file. This is
being done so that the current functionality can be extended
in future patchsets.

Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Tested-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/1594938035-7327-2-git-send-email-rishabhb@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Rishabh Bhatnagar 2020-07-16 15:20:31 -07:00 committed by Bjorn Andersson
parent efd8626213
commit 2c010cc378
4 changed files with 209 additions and 191 deletions
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1
drivers/remoteproc/Makefile
View File

@ -5,6 +5,7 @@
obj-$(CONFIG_REMOTEPROC) += remoteproc.o
remoteproc-y := remoteproc_core.o
remoteproc-y += remoteproc_coredump.o
remoteproc-y += remoteproc_debugfs.o
remoteproc-y += remoteproc_sysfs.o
remoteproc-y += remoteproc_virtio.o

191
drivers/remoteproc/remoteproc_core.c
View File

@ -26,7 +26,6 @@
#include <linux/firmware.h>
#include <linux/string.h>
#include <linux/debugfs.h>
#include <linux/devcoredump.h>
#include <linux/rculist.h>
#include <linux/remoteproc.h>
#include <linux/iommu.h>
@ -40,7 +39,6 @@
#include <linux/platform_device.h>
#include "remoteproc_internal.h"
#include "remoteproc_elf_helpers.h"
#define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL
@ -1253,19 +1251,6 @@ static int rproc_alloc_registered_carveouts(struct rproc *rproc)
return 0;
}
/**
* rproc_coredump_cleanup() - clean up dump_segments list
* @rproc: the remote processor handle
*/
static void rproc_coredump_cleanup(struct rproc *rproc)
{
struct rproc_dump_segment *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
list_del(&entry->node);
kfree(entry);
}
}
/**
* rproc_resource_cleanup() - clean up and free all acquired resources
@ -1641,182 +1626,6 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
return 0;
}
/**
* rproc_coredump_add_segment() - add segment of device memory to coredump
* @rproc: handle of a remote processor
* @da: device address
* @size: size of segment
*
* Add device memory to the list of segments to be included in a coredump for
* the remoteproc.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
{
struct rproc_dump_segment *segment;
segment = kzalloc(sizeof(*segment), GFP_KERNEL);
if (!segment)
return -ENOMEM;
segment->da = da;
segment->size = size;
list_add_tail(&segment->node, &rproc->dump_segments);
return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_segment);
/**
* rproc_coredump_add_custom_segment() - add custom coredump segment
* @rproc: handle of a remote processor
* @da: device address
* @size: size of segment
* @dumpfn: custom dump function called for each segment during coredump
* @priv: private data
*
* Add device memory to the list of segments to be included in the coredump
* and associate the segment with the given custom dump function and private
* data.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_add_custom_segment(struct rproc *rproc,
dma_addr_t da, size_t size,
void (*dumpfn)(struct rproc *rproc,
struct rproc_dump_segment *segment,
void *dest),
void *priv)
{
struct rproc_dump_segment *segment;
segment = kzalloc(sizeof(*segment), GFP_KERNEL);
if (!segment)
return -ENOMEM;
segment->da = da;
segment->size = size;
segment->priv = priv;
segment->dump = dumpfn;
list_add_tail(&segment->node, &rproc->dump_segments);
return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
/**
* rproc_coredump_set_elf_info() - set coredump elf information
* @rproc: handle of a remote processor
* @class: elf class for coredump elf file
* @machine: elf machine for coredump elf file
*
* Set elf information which will be used for coredump elf file.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
{
if (class != ELFCLASS64 && class != ELFCLASS32)
return -EINVAL;
rproc->elf_class = class;
rproc->elf_machine = machine;
return 0;
}
EXPORT_SYMBOL(rproc_coredump_set_elf_info);
/**
* 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;
void *phdr;
void *ehdr;
size_t data_size;
size_t offset;
void *data;
void *ptr;
u8 class = rproc->elf_class;
int phnum = 0;
if (list_empty(&rproc->dump_segments))
return;
if (class == ELFCLASSNONE) {
dev_err(&rproc->dev, "Elf class is not set\n");
return;
}
data_size = elf_size_of_hdr(class);
list_for_each_entry(segment, &rproc->dump_segments, node) {
data_size += elf_size_of_phdr(class) + segment->size;
phnum++;
}
data = vmalloc(data_size);
if (!data)
return;
ehdr = data;
memset(ehdr, 0, elf_size_of_hdr(class));
/* e_ident field is common for both elf32 and elf64 */
elf_hdr_init_ident(ehdr, class);
elf_hdr_set_e_type(class, ehdr, ET_CORE);
elf_hdr_set_e_machine(class, ehdr, rproc->elf_machine);
elf_hdr_set_e_version(class, ehdr, EV_CURRENT);
elf_hdr_set_e_entry(class, ehdr, rproc->bootaddr);
elf_hdr_set_e_phoff(class, ehdr, elf_size_of_hdr(class));
elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class));
elf_hdr_set_e_phentsize(class, ehdr, elf_size_of_phdr(class));
elf_hdr_set_e_phnum(class, ehdr, phnum);
phdr = data + elf_hdr_get_e_phoff(class, ehdr);
offset = elf_hdr_get_e_phoff(class, ehdr);
offset += elf_size_of_phdr(class) * elf_hdr_get_e_phnum(class, ehdr);
list_for_each_entry(segment, &rproc->dump_segments, node) {
memset(phdr, 0, elf_size_of_phdr(class));
elf_phdr_set_p_type(class, phdr, PT_LOAD);
elf_phdr_set_p_offset(class, phdr, offset);
elf_phdr_set_p_vaddr(class, phdr, segment->da);
elf_phdr_set_p_paddr(class, phdr, segment->da);
elf_phdr_set_p_filesz(class, phdr, segment->size);
elf_phdr_set_p_memsz(class, phdr, segment->size);
elf_phdr_set_p_flags(class, phdr, PF_R | PF_W | PF_X);
elf_phdr_set_p_align(class, phdr, 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 += elf_phdr_get_p_filesz(class, phdr);
phdr += elf_size_of_phdr(class);
}
dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
}
/**
* rproc_trigger_recovery() - recover a remoteproc

204
drivers/remoteproc/remoteproc_coredump.c Normal file
View File

@ -0,0 +1,204 @@
// 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/remoteproc.h>
#include "remoteproc_internal.h"
#include "remoteproc_elf_helpers.h"
/**
* rproc_coredump_cleanup() - clean up dump_segments list
* @rproc: the remote processor handle
*/
void rproc_coredump_cleanup(struct rproc *rproc)
{
struct rproc_dump_segment *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
list_del(&entry->node);
kfree(entry);
}
}
/**
* rproc_coredump_add_segment() - add segment of device memory to coredump
* @rproc: handle of a remote processor
* @da: device address
* @size: size of segment
*
* Add device memory to the list of segments to be included in a coredump for
* the remoteproc.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
{
struct rproc_dump_segment *segment;
segment = kzalloc(sizeof(*segment), GFP_KERNEL);
if (!segment)
return -ENOMEM;
segment->da = da;
segment->size = size;
list_add_tail(&segment->node, &rproc->dump_segments);
return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_segment);
/**
* rproc_coredump_add_custom_segment() - add custom coredump segment
* @rproc: handle of a remote processor
* @da: device address
* @size: size of segment
* @dumpfn: custom dump function called for each segment during coredump
* @priv: private data
*
* Add device memory to the list of segments to be included in the coredump
* and associate the segment with the given custom dump function and private
* data.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_add_custom_segment(struct rproc *rproc,
dma_addr_t da, size_t size,
void (*dumpfn)(struct rproc *rproc,
struct rproc_dump_segment *segment,
void *dest),
void *priv)
{
struct rproc_dump_segment *segment;
segment = kzalloc(sizeof(*segment), GFP_KERNEL);
if (!segment)
return -ENOMEM;
segment->da = da;
segment->size = size;
segment->priv = priv;
segment->dump = dumpfn;
list_add_tail(&segment->node, &rproc->dump_segments);
return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
/**
* rproc_coredump_set_elf_info() - set coredump elf information
* @rproc: handle of a remote processor
* @class: elf class for coredump elf file
* @machine: elf machine for coredump elf file
*
* Set elf information which will be used for coredump elf file.
*
* Return: 0 on success, negative errno on error.
*/
int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
{
if (class != ELFCLASS64 && class != ELFCLASS32)
return -EINVAL;
rproc->elf_class = class;
rproc->elf_machine = machine;
return 0;
}
EXPORT_SYMBOL(rproc_coredump_set_elf_info);
/**
* 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.
*/
void rproc_coredump(struct rproc *rproc)
{
struct rproc_dump_segment *segment;
void *phdr;
void *ehdr;
size_t data_size;
size_t offset;
void *data;
void *ptr;
u8 class = rproc->elf_class;
int phnum = 0;
if (list_empty(&rproc->dump_segments))
return;
if (class == ELFCLASSNONE) {
dev_err(&rproc->dev, "Elf class is not set\n");
return;
}
data_size = elf_size_of_hdr(class);
list_for_each_entry(segment, &rproc->dump_segments, node) {
data_size += elf_size_of_phdr(class) + segment->size;
phnum++;
}
data = vmalloc(data_size);
if (!data)
return;
ehdr = data;
memset(ehdr, 0, elf_size_of_hdr(class));
/* e_ident field is common for both elf32 and elf64 */
elf_hdr_init_ident(ehdr, class);
elf_hdr_set_e_type(class, ehdr, ET_CORE);
elf_hdr_set_e_machine(class, ehdr, rproc->elf_machine);
elf_hdr_set_e_version(class, ehdr, EV_CURRENT);
elf_hdr_set_e_entry(class, ehdr, rproc->bootaddr);
elf_hdr_set_e_phoff(class, ehdr, elf_size_of_hdr(class));
elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class));
elf_hdr_set_e_phentsize(class, ehdr, elf_size_of_phdr(class));
elf_hdr_set_e_phnum(class, ehdr, phnum);
phdr = data + elf_hdr_get_e_phoff(class, ehdr);
offset = elf_hdr_get_e_phoff(class, ehdr);
offset += elf_size_of_phdr(class) * elf_hdr_get_e_phnum(class, ehdr);
list_for_each_entry(segment, &rproc->dump_segments, node) {
memset(phdr, 0, elf_size_of_phdr(class));
elf_phdr_set_p_type(class, phdr, PT_LOAD);
elf_phdr_set_p_offset(class, phdr, offset);
elf_phdr_set_p_vaddr(class, phdr, segment->da);
elf_phdr_set_p_paddr(class, phdr, segment->da);
elf_phdr_set_p_filesz(class, phdr, segment->size);
elf_phdr_set_p_memsz(class, phdr, segment->size);
elf_phdr_set_p_flags(class, phdr, PF_R | PF_W | PF_X);
elf_phdr_set_p_align(class, phdr, 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 += elf_phdr_get_p_filesz(class, phdr);
phdr += elf_size_of_phdr(class);
}
dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
}

4
drivers/remoteproc/remoteproc_internal.h
View File

@ -47,6 +47,10 @@ extern struct class rproc_class;
int rproc_init_sysfs(void);
void rproc_exit_sysfs(void);
/* from remoteproc_coredump.c */
void rproc_coredump_cleanup(struct rproc *rproc);
void rproc_coredump(struct rproc *rproc);
void rproc_free_vring(struct rproc_vring *rvring);
int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);