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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 02:56:35 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 02:56:35 +0000 |
commit | eba0cfa6b0bef4f2e73c8630a7efa3944df8b0f8 (patch) | |
tree | 74c37eede1f0634cc5de1c63c934edaa1630c6bc /kexec/arch/mips/crashdump-mips.c | |
parent | Initial commit. (diff) | |
download | kexec-tools-upstream.tar.xz kexec-tools-upstream.zip |
Adding upstream version 1:2.0.27.upstream/1%2.0.27upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kexec/arch/mips/crashdump-mips.c')
-rw-r--r-- | kexec/arch/mips/crashdump-mips.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/kexec/arch/mips/crashdump-mips.c b/kexec/arch/mips/crashdump-mips.c new file mode 100644 index 0000000..00f4335 --- /dev/null +++ b/kexec/arch/mips/crashdump-mips.c @@ -0,0 +1,408 @@ +/* + * kexec: Linux boots Linux + * + * 2005 (C) IBM Corporation. + * 2008 (C) MontaVista Software, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation (version 2 of the License). + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <limits.h> +#include <inttypes.h> +#include <elf.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include "../../kexec.h" +#include "../../kexec-elf.h" +#include "../../kexec-syscall.h" +#include "../../crashdump.h" +#include "kexec-mips.h" +#include "crashdump-mips.h" +#include "unused.h" + +/* Stores a sorted list of RAM memory ranges for which to create elf headers. + * A separate program header is created for backup region */ +static struct memory_range crash_memory_range[CRASH_MAX_MEMORY_RANGES]; + +/* Not used currently but required by generic fs2dt code */ +struct memory_ranges usablemem_rgns; + +/* Memory region reserved for storing panic kernel and other data. */ +static struct memory_range crash_reserved_mem; + +/* Read kernel physical load addr from the file returned by proc_iomem() + * (Kernel Code) and store in kexec_info */ +static int get_kernel_paddr(struct crash_elf_info *elf_info) +{ + uint64_t start; + + if (xen_present()) /* Kernel not entity mapped under Xen */ + return 0; + + if (parse_iomem_single("Kernel code\n", &start, NULL) == 0) { + elf_info->kern_paddr_start = start; + dbgprintf("kernel load physical addr start = 0x%" PRIu64 "\n", start); + return 0; + } + + fprintf(stderr, "Cannot determine kernel physical load addr\n"); + return -1; +} + +static int get_kernel_vaddr_and_size(struct crash_elf_info *elf_info, + unsigned long start_offset) +{ + uint64_t end; + + if (!elf_info->kern_paddr_start) + return -1; + + elf_info->kern_vaddr_start = elf_info->kern_paddr_start | + start_offset; + /* If "Kernel bss" exists, the kernel ends there, else fall + * through and say that it ends at "Kernel data" */ + if (parse_iomem_single("Kernel bss\n", NULL, &end) == 0 || + parse_iomem_single("Kernel data\n", NULL, &end) == 0) { + elf_info->kern_size = end - elf_info->kern_paddr_start; + dbgprintf("kernel_vaddr= 0x%llx paddr %llx\n", + elf_info->kern_vaddr_start, + elf_info->kern_paddr_start); + dbgprintf("kernel size = 0x%lx\n", elf_info->kern_size); + return 0; + } + fprintf(stderr, "Cannot determine kernel virtual load addr and size\n"); + return -1; +} + +/* Removes crash reserve region from list of memory chunks for whom elf program + * headers have to be created. Assuming crash reserve region to be a single + * continuous area fully contained inside one of the memory chunks */ +static int exclude_crash_reserve_region(int *nr_ranges) +{ + int i, j, tidx = -1; + unsigned long long cstart, cend; + struct memory_range temp_region = { + .start = 0, + .end = 0 + }; + + /* Crash reserved region. */ + cstart = crash_reserved_mem.start; + cend = crash_reserved_mem.end; + + for (i = 0; i < (*nr_ranges); i++) { + unsigned long long mstart, mend; + mstart = crash_memory_range[i].start; + mend = crash_memory_range[i].end; + if (cstart < mend && cend > mstart) { + if (cstart != mstart && cend != mend) { + /* Split memory region */ + crash_memory_range[i].end = cstart - 1; + temp_region.start = cend + 1; + temp_region.end = mend; + temp_region.type = RANGE_RAM; + tidx = i+1; + } else if (cstart != mstart) + crash_memory_range[i].end = cstart - 1; + else + crash_memory_range[i].start = cend + 1; + } + } + /* Insert split memory region, if any. */ + if (tidx >= 0) { + if (*nr_ranges == CRASH_MAX_MEMORY_RANGES) { + /* No space to insert another element. */ + fprintf(stderr, "Error: Number of crash memory ranges" + " excedeed the max limit\n"); + return -1; + } + for (j = (*nr_ranges - 1); j >= tidx; j--) + crash_memory_range[j+1] = crash_memory_range[j]; + crash_memory_range[tidx].start = temp_region.start; + crash_memory_range[tidx].end = temp_region.end; + crash_memory_range[tidx].type = temp_region.type; + (*nr_ranges)++; + } + return 0; +} +/* Reads the appropriate file and retrieves the SYSTEM RAM regions for whom to + * create Elf headers. Keeping it separate from get_memory_ranges() as + * requirements are different in the case of normal kexec and crashdumps. + * + * Normal kexec needs to look at all of available physical memory irrespective + * of the fact how much of it is being used by currently running kernel. + * Crashdumps need to have access to memory regions actually being used by + * running kernel. Expecting a different file/data structure than /proc/iomem + * to look into down the line. May be something like /proc/kernelmem or may + * be zone data structures exported from kernel. + */ +static int get_crash_memory_ranges(struct memory_range **range, int *ranges) +{ + const char iomem[] = "/proc/iomem"; + int memory_ranges = 0; + char line[MAX_LINE]; + FILE *fp; + unsigned long long start, end; + + fp = fopen(iomem, "r"); + if (!fp) { + fprintf(stderr, "Cannot open %s: %s\n", + iomem, strerror(errno)); + return -1; + } + /* Separate segment for backup region */ + crash_memory_range[0].start = BACKUP_SRC_START; + crash_memory_range[0].end = BACKUP_SRC_END; + crash_memory_range[0].type = RANGE_RAM; + memory_ranges++; + + while (fgets(line, sizeof(line), fp) != 0) { + char *str; + int type, consumed, count; + if (memory_ranges >= CRASH_MAX_MEMORY_RANGES) + break; + count = sscanf(line, "%llx-%llx : %n", + &start, &end, &consumed); + if (count != 2) + continue; + str = line + consumed; + + /* Only Dumping memory of type System RAM. */ + if (memcmp(str, "System RAM\n", 11) == 0) { + type = RANGE_RAM; + } else if (memcmp(str, "Crash kernel\n", 13) == 0) { + /* Reserved memory region. New kernel can + * use this region to boot into. */ + crash_reserved_mem.start = start; + crash_reserved_mem.end = end; + crash_reserved_mem.type = RANGE_RAM; + continue; + } else + continue; + + if (start == BACKUP_SRC_START && end >= (BACKUP_SRC_END + 1)) + start = BACKUP_SRC_END + 1; + + crash_memory_range[memory_ranges].start = start; + crash_memory_range[memory_ranges].end = end; + crash_memory_range[memory_ranges].type = type; + memory_ranges++; + + /* Segregate linearly mapped region. */ + if (MAXMEM && (MAXMEM - 1) >= start && (MAXMEM - 1) <= end) { + crash_memory_range[memory_ranges - 1].end = MAXMEM - 1; + + /* Add segregated region. */ + crash_memory_range[memory_ranges].start = MAXMEM; + crash_memory_range[memory_ranges].end = end; + crash_memory_range[memory_ranges].type = type; + memory_ranges++; + } + } + fclose(fp); + + if (exclude_crash_reserve_region(&memory_ranges) < 0) + return -1; + + *range = crash_memory_range; + *ranges = memory_ranges; + return 0; +} + +/* Adds the appropriate mem= options to command line, indicating the + * memory region the new kernel can use to boot into. */ +static int cmdline_add_mem(char *cmdline, unsigned long addr, + unsigned long size) +{ + int cmdlen, len; + char str[50], *ptr; + + addr = addr/1024; + size = size/1024; + ptr = str; + strcpy(str, " mem="); + ptr += strlen(str); + ultoa(size, ptr); + strcat(str, "K@"); + ptr = str + strlen(str); + ultoa(addr, ptr); + strcat(str, "K"); + len = strlen(str); + cmdlen = strlen(cmdline) + len; + if (cmdlen > (COMMAND_LINE_SIZE - 1)) + die("Command line overflow\n"); + strcat(cmdline, str); + + return 0; +} + +/* Adds the elfcorehdr= command line parameter to command line. */ +static int cmdline_add_elfcorehdr(char *cmdline, unsigned long addr) +{ + int cmdlen, len, align = 1024; + char str[30], *ptr; + + /* Passing in elfcorehdr=xxxK format. Saves space required in cmdline. + * Ensure 1K alignment*/ + if (addr%align) + return -1; + addr = addr/align; + ptr = str; + strcpy(str, " elfcorehdr="); + ptr += strlen(str); + ultoa(addr, ptr); + strcat(str, "K"); + len = strlen(str); + cmdlen = strlen(cmdline) + len; + if (cmdlen > (COMMAND_LINE_SIZE - 1)) + die("Command line overflow\n"); + strcat(cmdline, str); + return 0; +} + +#if __BYTE_ORDER == __LITTLE_ENDIAN +# define ELFDATALOCAL ELFDATA2LSB +#elif __BYTE_ORDER == __BIG_ENDIAN +# define ELFDATALOCAL ELFDATA2MSB +#else +# error Unknown byte order +#endif + +static struct crash_elf_info elf_info64 = { + class: ELFCLASS64, + data : ELFDATALOCAL, + machine : EM_MIPS, + page_offset : PAGE_OFFSET, + lowmem_limit : 0, /* 0 == no limit */ +}; + +static struct crash_elf_info elf_info32 = { + class: ELFCLASS32, + data : ELFDATALOCAL, + machine : EM_MIPS, + page_offset : PAGE_OFFSET, + lowmem_limit : MAXMEM, +}; + +static int patch_elf_info(void) +{ + const char cpuinfo[] = "/proc/cpuinfo"; + char line[MAX_LINE]; + FILE *fp; + + fp = fopen(cpuinfo, "r"); + if (!fp) { + fprintf(stderr, "Cannot open %s: %s\n", + cpuinfo, strerror(errno)); + return -1; + } + while (fgets(line, sizeof(line), fp) != 0) { + if (strncmp(line, "cpu model", 9) == 0) { + /* OCTEON uses a different page_offset. */ + if (strstr(line, "Octeon")) + elf_info64.page_offset = OCTEON_PAGE_OFFSET; + /* LOONGSON uses a different page_offset. */ + else if (strstr(line, "Loongson")) + elf_info64.page_offset = LOONGSON_PAGE_OFFSET; + break; + } + } + fclose(fp); + return 0; +} + +/* Loads additional segments in case of a panic kernel is being loaded. + * One segment for backup region, another segment for storing elf headers + * for crash memory image. + */ +int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline, + unsigned long UNUSED(max_addr), + unsigned long UNUSED(min_base)) +{ + void *tmp; + unsigned long sz, elfcorehdr; + int nr_ranges, align = 1024; + struct memory_range *mem_range; + crash_create_elf_headers_func crash_create = crash_create_elf32_headers; + struct crash_elf_info *elf_info = &elf_info32; + unsigned long start_offset = 0x80000000UL; + + if (patch_elf_info()) + return -1; + + if (arch_options.core_header_type == CORE_TYPE_ELF64) { + elf_info = &elf_info64; + crash_create = crash_create_elf64_headers; + start_offset = (unsigned long)0xffffffff80000000UL; + } + + if (get_kernel_paddr(elf_info)) + return -1; + + if (get_kernel_vaddr_and_size(elf_info, start_offset)) + return -1; + + if (get_crash_memory_ranges(&mem_range, &nr_ranges) < 0) + return -1; + + info->backup_src_start = BACKUP_SRC_START; + info->backup_src_size = BACKUP_SRC_SIZE; + /* Create a backup region segment to store backup data*/ + sz = _ALIGN(BACKUP_SRC_SIZE, align); + tmp = xmalloc(sz); + memset(tmp, 0, sz); + info->backup_start = add_buffer(info, tmp, sz, sz, align, + crash_reserved_mem.start, + crash_reserved_mem.end, -1); + + if (crash_create(info, elf_info, crash_memory_range, nr_ranges, + &tmp, &sz, ELF_CORE_HEADER_ALIGN) < 0) { + free(tmp); + return -1; + } + + elfcorehdr = add_buffer(info, tmp, sz, sz, align, + crash_reserved_mem.start, + crash_reserved_mem.end, -1); + + /* + * backup segment is after elfcorehdr, so use elfcorehdr as top of + * kernel's available memory + */ + cmdline_add_mem(mod_cmdline, crash_reserved_mem.start, + crash_reserved_mem.end - crash_reserved_mem.start + 1); + cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr); + + dbgprintf("CRASH MEMORY RANGES:\n"); + dbgprintf("%016Lx-%016Lx\n", crash_reserved_mem.start, + crash_reserved_mem.end); + return 0; +} + +int is_crashkernel_mem_reserved(void) +{ + uint64_t start, end; + + return parse_iomem_single("Crash kernel\n", &start, &end) == 0 ? + (start != end) : 0; +} + +int get_crash_kernel_load_range(uint64_t *start, uint64_t *end) +{ + return parse_iomem_single("Crash kernel\n", start, end); +} |