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-rw-r--r--kexec/arch/ppc64/crashdump-ppc64.c644
1 files changed, 644 insertions, 0 deletions
diff --git a/kexec/arch/ppc64/crashdump-ppc64.c b/kexec/arch/ppc64/crashdump-ppc64.c
new file mode 100644
index 0000000..6d47898
--- /dev/null
+++ b/kexec/arch/ppc64/crashdump-ppc64.c
@@ -0,0 +1,644 @@
+/*
+ * kexec: Linux boots Linux
+ *
+ * Created by: R Sharada (sharada@in.ibm.com)
+ * Copyright (C) IBM Corporation, 2005. All rights reserved
+ *
+ * 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 <unistd.h>
+#include <errno.h>
+#include <limits.h>
+#include <elf.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "../../kexec.h"
+#include "../../kexec-elf.h"
+#include "../../kexec-syscall.h"
+#include "../../crashdump.h"
+#include "kexec-ppc64.h"
+#include "../../fs2dt.h"
+#include "crashdump-ppc64.h"
+
+#define DEVTREE_CRASHKERNEL_BASE "/proc/device-tree/chosen/linux,crashkernel-base"
+#define DEVTREE_CRASHKERNEL_SIZE "/proc/device-tree/chosen/linux,crashkernel-size"
+
+unsigned int num_of_lmb_sets;
+unsigned int is_dyn_mem_v2;
+uint64_t lmb_size;
+
+static struct crash_elf_info elf_info64 =
+{
+ class: ELFCLASS64,
+#if BYTE_ORDER == LITTLE_ENDIAN
+ data: ELFDATA2LSB,
+#else
+ data: ELFDATA2MSB,
+#endif
+ machine: EM_PPC64,
+ page_offset: PAGE_OFFSET,
+ lowmem_limit: MAXMEM,
+};
+
+static struct crash_elf_info elf_info32 =
+{
+ class: ELFCLASS32,
+ data: ELFDATA2MSB,
+ machine: EM_PPC64,
+ page_offset: PAGE_OFFSET,
+ lowmem_limit: MAXMEM,
+};
+
+extern struct arch_options_t arch_options;
+
+/* 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 = NULL;
+
+/* Define a variable to replace the CRASH_MAX_MEMORY_RANGES macro */
+static int crash_max_memory_ranges;
+
+/*
+ * Used to save various memory ranges/regions needed for the captured
+ * kernel to boot. (lime memmap= option in other archs)
+ */
+mem_rgns_t usablemem_rgns = {0, NULL};
+
+static unsigned long long cstart, cend;
+static int memory_ranges;
+
+/*
+ * Exclude the region that lies within crashkernel and above the memory
+ * limit which is reflected by mem= kernel option.
+ */
+static void exclude_crash_region(uint64_t start, uint64_t end)
+{
+ /* If memory_limit is set then exclude the memory region above it. */
+ if (memory_limit) {
+ if (start >= memory_limit)
+ return;
+ if (end > memory_limit)
+ end = memory_limit;
+ }
+
+ if (cstart < end && cend > start) {
+ if (start < cstart && end > cend) {
+ crash_memory_range[memory_ranges].start = start;
+ crash_memory_range[memory_ranges].end = cstart;
+ crash_memory_range[memory_ranges].type = RANGE_RAM;
+ memory_ranges++;
+ crash_memory_range[memory_ranges].start = cend;
+ crash_memory_range[memory_ranges].end = end;
+ crash_memory_range[memory_ranges].type = RANGE_RAM;
+ memory_ranges++;
+ } else if (start < cstart) {
+ crash_memory_range[memory_ranges].start = start;
+ crash_memory_range[memory_ranges].end = cstart;
+ crash_memory_range[memory_ranges].type = RANGE_RAM;
+ memory_ranges++;
+ } else if (end > cend) {
+ crash_memory_range[memory_ranges].start = cend;
+ crash_memory_range[memory_ranges].end = end;
+ crash_memory_range[memory_ranges].type = RANGE_RAM;
+ memory_ranges++;
+ }
+ } else {
+ crash_memory_range[memory_ranges].start = start;
+ crash_memory_range[memory_ranges].end = end;
+ crash_memory_range[memory_ranges].type = RANGE_RAM;
+ memory_ranges++;
+ }
+}
+
+static int get_dyn_reconf_crash_memory_ranges(void)
+{
+ uint64_t start, end;
+ uint64_t startrange, endrange;
+ uint64_t size;
+ char fname[128], buf[32];
+ FILE *file;
+ unsigned int i;
+ int n;
+ uint32_t flags;
+
+ strcpy(fname, "/proc/device-tree/");
+ strcat(fname, "ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory");
+ if (is_dyn_mem_v2)
+ strcat(fname, "-v2");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ return -1;
+ }
+
+ fseek(file, 4, SEEK_SET);
+ startrange = endrange = 0;
+ size = lmb_size;
+ for (i = 0; i < num_of_lmb_sets; i++) {
+ if ((n = fread(buf, 1, LMB_ENTRY_SIZE, file)) < 0) {
+ perror(fname);
+ fclose(file);
+ return -1;
+ }
+ if (memory_ranges >= (max_memory_ranges + 1)) {
+ /* No space to insert another element. */
+ fprintf(stderr,
+ "Error: Number of crash memory ranges"
+ " excedeed the max limit\n");
+ fclose(file);
+ return -1;
+ }
+
+ /*
+ * If the property is ibm,dynamic-memory-v2, the first 4 bytes
+ * tell the number of sequential LMBs in this entry.
+ */
+ if (is_dyn_mem_v2)
+ size = be32_to_cpu(((unsigned int *)buf)[0]) * lmb_size;
+
+ start = be64_to_cpu(*((uint64_t *)&buf[DRCONF_ADDR]));
+ end = start + size;
+ if (start == 0 && end >= (BACKUP_SRC_END + 1))
+ start = BACKUP_SRC_END + 1;
+
+ flags = be32_to_cpu((*((uint32_t *)&buf[DRCONF_FLAGS])));
+ /* skip this block if the reserved bit is set in flags (0x80)
+ or if the block is not assigned to this partition (0x8) */
+ if ((flags & 0x80) || !(flags & 0x8))
+ continue;
+
+ if (start != endrange) {
+ if (startrange != endrange)
+ exclude_crash_region(startrange, endrange);
+ startrange = start;
+ }
+ endrange = end;
+ }
+ if (startrange != endrange)
+ exclude_crash_region(startrange, endrange);
+
+ fclose(file);
+ return 0;
+}
+
+/*
+ * For a given memory node, check if it is mapped to system RAM or
+ * to onboard memory on accelerator device like GPU card or such.
+ */
+static int is_coherent_device_mem(const char *fname)
+{
+ char fpath[PATH_LEN];
+ char buf[32];
+ DIR *dmem;
+ FILE *file;
+ struct dirent *mentry;
+ int cnt, ret = 0;
+
+ strcpy(fpath, fname);
+ if ((dmem = opendir(fpath)) == NULL) {
+ perror(fpath);
+ return -1;
+ }
+
+ while ((mentry = readdir(dmem)) != NULL) {
+ if (strcmp(mentry->d_name, "compatible"))
+ continue;
+
+ strcat(fpath, "/compatible");
+ if ((file = fopen(fpath, "r")) == NULL) {
+ perror(fpath);
+ ret = -1;
+ break;
+ }
+ if ((cnt = fread(buf, 1, 32, file)) < 0) {
+ perror(fpath);
+ fclose(file);
+ ret = -1;
+ break;
+ }
+ if (!strncmp(buf, "ibm,coherent-device-memory", 26)) {
+ fclose(file);
+ ret = 1;
+ break;
+ }
+ fclose(file);
+ }
+
+ closedir(dmem);
+ return ret;
+}
+
+
+/* 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)
+{
+
+ char device_tree[256] = "/proc/device-tree/";
+ char fname[PATH_LEN];
+ char buf[MAXBYTES];
+ DIR *dir, *dmem;
+ FILE *file;
+ struct dirent *dentry, *mentry;
+ int n, ret, crash_rng_len = 0;
+ unsigned long long start, end;
+ int page_size;
+
+ crash_max_memory_ranges = max_memory_ranges + 6;
+ crash_rng_len = sizeof(struct memory_range) * crash_max_memory_ranges;
+
+ crash_memory_range = (struct memory_range *) malloc(crash_rng_len);
+ if (!crash_memory_range) {
+ fprintf(stderr, "Allocation for crash memory range failed\n");
+ return -1;
+ }
+ memset(crash_memory_range, 0, crash_rng_len);
+
+ /* create a separate program header for the backup region */
+ crash_memory_range[0].start = BACKUP_SRC_START;
+ crash_memory_range[0].end = BACKUP_SRC_END + 1;
+ crash_memory_range[0].type = RANGE_RAM;
+ memory_ranges++;
+
+ if ((dir = opendir(device_tree)) == NULL) {
+ perror(device_tree);
+ goto err;
+ }
+
+ cstart = crash_base;
+ cend = crash_base + crash_size;
+
+ while ((dentry = readdir(dir)) != NULL) {
+ if (!strncmp(dentry->d_name,
+ "ibm,dynamic-reconfiguration-memory", 35)){
+ get_dyn_reconf_crash_memory_ranges();
+ continue;
+ }
+ if (strncmp(dentry->d_name, "memory@", 7) &&
+ strcmp(dentry->d_name, "memory"))
+ continue;
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+
+ ret = is_coherent_device_mem(fname);
+ if (ret == -1) {
+ closedir(dir);
+ goto err;
+ } else if (ret == 1) {
+ /*
+ * Avoid adding this memory region as it is not
+ * mapped to system RAM.
+ */
+ continue;
+ }
+
+ if ((dmem = opendir(fname)) == NULL) {
+ perror(fname);
+ closedir(dir);
+ goto err;
+ }
+ while ((mentry = readdir(dmem)) != NULL) {
+ if (strcmp(mentry->d_name, "reg"))
+ continue;
+ strcat(fname, "/reg");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ closedir(dmem);
+ closedir(dir);
+ goto err;
+ }
+ if ((n = fread(buf, 1, MAXBYTES, file)) < 0) {
+ perror(fname);
+ fclose(file);
+ closedir(dmem);
+ closedir(dir);
+ goto err;
+ }
+ if (memory_ranges >= (max_memory_ranges + 1)) {
+ /* No space to insert another element. */
+ fprintf(stderr,
+ "Error: Number of crash memory ranges"
+ " excedeed the max limit\n");
+ goto err;
+ }
+
+ start = be64_to_cpu(((unsigned long long *)buf)[0]);
+ end = start +
+ be64_to_cpu(((unsigned long long *)buf)[1]);
+ if (start == 0 && end >= (BACKUP_SRC_END + 1))
+ start = BACKUP_SRC_END + 1;
+
+ exclude_crash_region(start, end);
+ fclose(file);
+ }
+ closedir(dmem);
+ }
+ closedir(dir);
+
+ /*
+ * If RTAS region is overlapped with crashkernel, need to create ELF
+ * Program header for the overlapped memory.
+ */
+ if (crash_base < rtas_base + rtas_size &&
+ rtas_base < crash_base + crash_size) {
+ page_size = getpagesize();
+ cstart = rtas_base;
+ cend = rtas_base + rtas_size;
+ if (cstart < crash_base)
+ cstart = crash_base;
+ if (cend > crash_base + crash_size)
+ cend = crash_base + crash_size;
+ /*
+ * The rtas section created here is formed by reading rtas-base
+ * and rtas-size from /proc/device-tree/rtas. Unfortunately
+ * rtas-size is not required to be a multiple of PAGE_SIZE
+ * The remainder of the page it ends on is just garbage, and is
+ * safe to read, its just not accounted in rtas-size. Since
+ * we're creating an elf section here though, lets round it up
+ * to the next page size boundary though, so makedumpfile can
+ * read it safely without going south on us.
+ */
+ cend = _ALIGN(cend, page_size);
+
+ crash_memory_range[memory_ranges].start = cstart;
+ crash_memory_range[memory_ranges++].end = cend;
+ }
+
+ /*
+ * If OPAL region is overlapped with crashkernel, need to create ELF
+ * Program header for the overlapped memory.
+ */
+ if (crash_base < opal_base + opal_size &&
+ opal_base < crash_base + crash_size) {
+ page_size = getpagesize();
+ cstart = opal_base;
+ cend = opal_base + opal_size;
+ if (cstart < crash_base)
+ cstart = crash_base;
+ if (cend > crash_base + crash_size)
+ cend = crash_base + crash_size;
+ /*
+ * The opal section created here is formed by reading opal-base
+ * and opal-size from /proc/device-tree/ibm,opal. Unfortunately
+ * opal-size is not required to be a multiple of PAGE_SIZE
+ * The remainder of the page it ends on is just garbage, and is
+ * safe to read, its just not accounted in opal-size. Since
+ * we're creating an elf section here though, lets round it up
+ * to the next page size boundary though, so makedumpfile can
+ * read it safely without going south on us.
+ */
+ cend = _ALIGN(cend, page_size);
+
+ crash_memory_range[memory_ranges].start = cstart;
+ crash_memory_range[memory_ranges++].end = cend;
+ }
+ *range = crash_memory_range;
+ *ranges = memory_ranges;
+
+ int j;
+ dbgprintf("CRASH MEMORY RANGES\n");
+ for(j = 0; j < *ranges; j++) {
+ start = crash_memory_range[j].start;
+ end = crash_memory_range[j].end;
+ dbgprintf("%016Lx-%016Lx\n", start, end);
+ }
+
+ return 0;
+
+err:
+ if (crash_memory_range)
+ free(crash_memory_range);
+ return -1;
+}
+
+static int add_cmdline_param(char *cmdline, uint64_t addr, char *cmdstr,
+ char *byte)
+{
+ int cmdline_size, cmdlen, len, align = 1024;
+ char str[COMMAND_LINE_SIZE], *ptr;
+
+ /* Passing in =xxxK / =xxxM format. Saves space required in cmdline.*/
+ switch (byte[0]) {
+ case 'K':
+ if (addr%align)
+ return -1;
+ addr = addr/align;
+ break;
+ case 'M':
+ addr = addr/(align *align);
+ break;
+ }
+ ptr = str;
+ strcpy(str, cmdstr);
+ ptr += strlen(str);
+ ultoa(addr, ptr);
+ strcat(str, byte);
+ len = strlen(str);
+ cmdlen = strlen(cmdline) + len;
+ cmdline_size = COMMAND_LINE_SIZE;
+ if (cmdlen > (cmdline_size - 1))
+ die("Command line overflow\n");
+ strcat(cmdline, str);
+ dbgprintf("Command line after adding elfcorehdr: %s\n", cmdline);
+ 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,
+ uint64_t max_addr, unsigned long min_base)
+{
+ void *tmp;
+ unsigned long sz;
+ uint64_t elfcorehdr;
+ int nr_ranges, align = 1024, i;
+ unsigned long long end;
+ struct memory_range *mem_range;
+
+ 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,
+ 0, max_addr, 1);
+ reserve(info->backup_start, sz);
+
+ /* On ppc64 memory ranges in device-tree is denoted as start
+ * and size rather than start and end, as is the case with
+ * other architectures like i386 . Because of this when loading
+ * the memory ranges in crashdump-elf.c the filesz calculation
+ * [ end - start + 1 ] goes for a toss.
+ *
+ * To be in sync with other archs adjust the end value for
+ * every crash memory range before calling the generic function
+ */
+
+ for (i = 0; i < nr_ranges; i++) {
+ end = crash_memory_range[i].end - 1;
+ crash_memory_range[i].end = end;
+ }
+
+
+ /* Create elf header segment and store crash image data. */
+ if (arch_options.core_header_type == CORE_TYPE_ELF64) {
+ if (crash_create_elf64_headers(info, &elf_info64,
+ crash_memory_range, nr_ranges,
+ &tmp, &sz,
+ ELF_CORE_HEADER_ALIGN) < 0) {
+ free (tmp);
+ return -1;
+ }
+ }
+ else {
+ if (crash_create_elf32_headers(info, &elf_info32,
+ crash_memory_range, nr_ranges,
+ &tmp, &sz,
+ ELF_CORE_HEADER_ALIGN) < 0) {
+ free(tmp);
+ return -1;
+ }
+ }
+
+ elfcorehdr = add_buffer(info, tmp, sz, sz, align, min_base,
+ max_addr, 1);
+ reserve(elfcorehdr, sz);
+ /* modify and store the cmdline in a global array. This is later
+ * read by flatten_device_tree and modified if required
+ */
+ add_cmdline_param(mod_cmdline, elfcorehdr, " elfcorehdr=", "K");
+ return 0;
+}
+
+/*
+ * Used to save various memory regions needed for the captured kernel.
+ */
+
+void add_usable_mem_rgns(unsigned long long base, unsigned long long size)
+{
+ unsigned int i;
+ unsigned long long end = base + size;
+ unsigned long long ustart, uend;
+
+ base = _ALIGN_DOWN(base, getpagesize());
+ end = _ALIGN_UP(end, getpagesize());
+
+ for (i=0; i < usablemem_rgns.size; i++) {
+ ustart = usablemem_rgns.ranges[i].start;
+ uend = usablemem_rgns.ranges[i].end;
+ if (base < uend && end > ustart) {
+ if ((base >= ustart) && (end <= uend))
+ return;
+ if (base < ustart && end > uend) {
+ usablemem_rgns.ranges[i].start = base;
+ usablemem_rgns.ranges[i].end = end;
+#ifdef DEBUG
+ fprintf(stderr, "usable memory rgn %u: new base:%llx new size:%llx\n",
+ i, base, size);
+#endif
+ return;
+ } else if (base < ustart) {
+ usablemem_rgns.ranges[i].start = base;
+#ifdef DEBUG
+ fprintf(stderr, "usable memory rgn %u: new base:%llx new size:%llx",
+ i, base, usablemem_rgns.ranges[i].end - base);
+#endif
+ return;
+ } else if (end > uend){
+ usablemem_rgns.ranges[i].end = end;
+#ifdef DEBUG
+ fprintf(stderr, "usable memory rgn %u: new end:%llx, new size:%llx",
+ i, end, end - usablemem_rgns.ranges[i].start);
+#endif
+ return;
+ }
+ }
+ }
+ usablemem_rgns.ranges[usablemem_rgns.size].start = base;
+ usablemem_rgns.ranges[usablemem_rgns.size++].end = end;
+
+ dbgprintf("usable memory rgns size:%u base:%llx size:%llx\n",
+ usablemem_rgns.size, base, size);
+}
+
+int get_crash_kernel_load_range(uint64_t *start, uint64_t *end)
+{
+ unsigned long long value;
+
+ if (!get_devtree_value(DEVTREE_CRASHKERNEL_BASE, &value))
+ *start = be64_to_cpu(value);
+ else
+ return -1;
+
+ if (!get_devtree_value(DEVTREE_CRASHKERNEL_SIZE, &value))
+ *end = *start + be64_to_cpu(value) - 1;
+ else
+ return -1;
+
+ return 0;
+}
+
+int is_crashkernel_mem_reserved(void)
+{
+ int fd;
+
+ fd = open(DEVTREE_CRASHKERNEL_BASE, O_RDONLY);
+ if (fd < 0)
+ return 0;
+ close(fd);
+ return 1;
+}
+
+#if 0
+static int sort_regions(mem_rgns_t *rgn)
+{
+ int i, j;
+ unsigned long long tstart, tend;
+ for (i = 0; i < rgn->size; i++) {
+ for (j = 0; j < rgn->size - i - 1; j++) {
+ if (rgn->ranges[j].start > rgn->ranges[j+1].start) {
+ tstart = rgn->ranges[j].start;
+ tend = rgn->ranges[j].end;
+ rgn->ranges[j].start = rgn->ranges[j+1].start;
+ rgn->ranges[j].end = rgn->ranges[j+1].end;
+ rgn->ranges[j+1].start = tstart;
+ rgn->ranges[j+1].end = tend;
+ }
+ }
+ }
+ return 0;
+
+}
+#endif
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-11 00:08:14 +0000