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/*
* LoongArch crashdump.
*
* Copyright (C) 2022 Loongson Technology Corporation Limited.
* Youling Tang <tangyouling@loongson.cn>
*
* derived from crashdump-arm64.c
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <linux/elf.h>
#include "kexec.h"
#include "crashdump.h"
#include "crashdump-loongarch.h"
#include "iomem.h"
#include "kexec-loongarch.h"
#include "kexec-elf.h"
#include "mem_regions.h"
/* memory ranges of crashed kernel */
static struct memory_ranges system_memory_rgns;
/* memory range reserved for crashkernel */
struct memory_range crash_reserved_mem[CRASH_MAX_RESERVED_RANGES];
struct memory_ranges usablemem_rgns = {
.size = 0,
.max_size = CRASH_MAX_RESERVED_RANGES,
.ranges = crash_reserved_mem,
};
struct memory_range elfcorehdr_mem;
static struct crash_elf_info elf_info64 = {
.class = ELFCLASS64,
.data = ELFDATA2LSB,
.machine = EM_LOONGARCH,
.page_offset = PAGE_OFFSET,
};
/*
* iomem_range_callback() - callback called for each iomem region
* @data: not used
* @nr: not used
* @str: name of the memory region
* @base: start address of the memory region
* @length: size of the memory region
*
* This function is called once for each memory region found in /proc/iomem.
* It locates system RAM and crashkernel reserved memory and places these to
* variables, respectively, system_memory_rgns and usablemem_rgns.
*/
static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr),
char *str, unsigned long long base,
unsigned long long length)
{
if (strncmp(str, CRASH_KERNEL, strlen(CRASH_KERNEL)) == 0)
return mem_regions_alloc_and_add(&usablemem_rgns,
base, length, RANGE_RAM);
else if (strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)) == 0)
return mem_regions_alloc_and_add(&system_memory_rgns,
base, length, RANGE_RAM);
else if (strncmp(str, KERNEL_CODE, strlen(KERNEL_CODE)) == 0)
elf_info64.kern_paddr_start = base;
else if (strncmp(str, KERNEL_DATA, strlen(KERNEL_DATA)) == 0)
elf_info64.kern_size = base + length - elf_info64.kern_paddr_start;
return 0;
}
int is_crashkernel_mem_reserved(void)
{
if (!usablemem_rgns.size)
kexec_iomem_for_each_line(NULL, iomem_range_callback, NULL);
return usablemem_rgns.size;
}
/*
* crash_get_memory_ranges() - read system physical memory
*
* Function reads through system physical memory and stores found memory
* regions in system_memory_ranges.
* Regions are sorted in ascending order.
*
* Returns 0 in case of success and a negative value otherwise.
*/
static int crash_get_memory_ranges(void)
{
int i;
/*
* First read all memory regions that can be considered as
* system memory including the crash area.
*/
if (!usablemem_rgns.size)
kexec_iomem_for_each_line(NULL, iomem_range_callback, NULL);
/* allow one or two regions for crash dump kernel */
if (!usablemem_rgns.size)
return -EINVAL;
dbgprint_mem_range("Reserved memory range",
usablemem_rgns.ranges, usablemem_rgns.size);
for (i = 0; i < usablemem_rgns.size; i++) {
if (mem_regions_alloc_and_exclude(&system_memory_rgns,
&crash_reserved_mem[i])) {
fprintf(stderr, "Cannot allocate memory for ranges\n");
return -ENOMEM;
}
}
/*
* Make sure that the memory regions are sorted.
*/
mem_regions_sort(&system_memory_rgns);
dbgprint_mem_range("Coredump memory ranges",
system_memory_rgns.ranges, system_memory_rgns.size);
/*
* For additional kernel code/data segment.
* kern_paddr_start/kern_size are determined in iomem_range_callback
*/
elf_info64.kern_vaddr_start = get_kernel_sym("_text");
if (!elf_info64.kern_vaddr_start)
elf_info64.kern_vaddr_start = UINT64_MAX;
return 0;
}
/*
* load_crashdump_segments() - load the elf core header
* @info: kexec info structure
*
* This function creates and loads an additional segment of elf core header
: which is used to construct /proc/vmcore on crash dump kernel.
*
* Return 0 in case of success and -1 in case of error.
*/
int load_crashdump_segments(struct kexec_info *info)
{
unsigned long elfcorehdr;
unsigned long bufsz;
void *buf;
int err;
/*
* First fetch all the memory (RAM) ranges that we are going to
* pass to the crash dump kernel during panic.
*/
err = crash_get_memory_ranges();
if (err)
return EFAILED;
err = crash_create_elf64_headers(info, &elf_info64,
system_memory_rgns.ranges, system_memory_rgns.size,
&buf, &bufsz, ELF_CORE_HEADER_ALIGN);
if (err)
return EFAILED;
elfcorehdr = add_buffer(info, buf, bufsz, bufsz, 1024,
crash_reserved_mem[usablemem_rgns.size - 1].start,
crash_reserved_mem[usablemem_rgns.size - 1].end, -1);
elfcorehdr_mem.start = elfcorehdr;
elfcorehdr_mem.end = elfcorehdr + bufsz - 1;
dbgprintf("%s: elfcorehdr 0x%llx-0x%llx\n", __func__,
elfcorehdr_mem.start, elfcorehdr_mem.end);
return 0;
}
/*
* e_entry and p_paddr are actually in virtual address space.
* Those values will be translated to physcal addresses by using
* virt_to_phys() in add_segment().
* So let's fix up those values for later use so the memory base will be
* correctly replaced with crash_reserved_mem[usablemem_rgns.size - 1].start.
*/
void fixup_elf_addrs(struct mem_ehdr *ehdr)
{
struct mem_phdr *phdr;
int i;
ehdr->e_entry += crash_reserved_mem[usablemem_rgns.size - 1].start;
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &ehdr->e_phdr[i];
if (phdr->p_type != PT_LOAD)
continue;
phdr->p_paddr += crash_reserved_mem[usablemem_rgns.size - 1].start;
}
}
int get_crash_kernel_load_range(uint64_t *start, uint64_t *end)
{
if (!usablemem_rgns.size)
kexec_iomem_for_each_line(NULL, iomem_range_callback, NULL);
if (!usablemem_rgns.size)
return -1;
*start = crash_reserved_mem[usablemem_rgns.size - 1].start;
*end = crash_reserved_mem[usablemem_rgns.size - 1].end;
return 0;
}
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