forked from Minki/linux
powerpc/fadump: process the crashdump by exporting it as /proc/vmcore
Add support in the kernel to process the crash'ed kernel's memory preserved during MPIPL and export it as /proc/vmcore file for the userland scripts to filter and analyze it later. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821351482.5656.6255805804744333073.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini
Michael Ellerman
parent
51bba8edef
commit
2a1b06dd3a
@ -12,6 +12,7 @@
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#include <linux/of_fdt.h>
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#include <linux/libfdt.h>
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#include <linux/mm.h>
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#include <linux/crash_dump.h>
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#include <asm/page.h>
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#include <asm/opal.h>
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@ -19,6 +20,7 @@
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#include "opal-fadump.h"
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static const struct opal_fadump_mem_struct *opal_fdm_active;
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static struct opal_fadump_mem_struct *opal_fdm;
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static int opal_fadump_unregister(struct fw_dump *fadump_conf);
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@ -39,6 +41,37 @@ static void opal_fadump_update_config(struct fw_dump *fadump_conf,
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fadump_conf->fadumphdr_addr = fdm->fadumphdr_addr;
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}
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/*
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* This function is called in the capture kernel to get configuration details
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* from metadata setup by the first kernel.
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*/
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static void opal_fadump_get_config(struct fw_dump *fadump_conf,
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const struct opal_fadump_mem_struct *fdm)
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{
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int i;
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if (!fadump_conf->dump_active)
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return;
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fadump_conf->boot_memory_size = 0;
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pr_debug("Boot memory regions:\n");
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for (i = 0; i < fdm->region_cnt; i++) {
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pr_debug("\t%d. base: 0x%llx, size: 0x%llx\n",
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(i + 1), fdm->rgn[i].src, fdm->rgn[i].size);
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fadump_conf->boot_memory_size += fdm->rgn[i].size;
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}
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/*
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* Start address of reserve dump area (permanent reservation) for
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* re-registering FADump after dump capture.
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*/
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fadump_conf->reserve_dump_area_start = fdm->rgn[0].dest;
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opal_fadump_update_config(fadump_conf, fdm);
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}
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/* Initialize kernel metadata */
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static void opal_fadump_init_metadata(struct opal_fadump_mem_struct *fdm)
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{
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@ -209,24 +242,97 @@ static void opal_fadump_cleanup(struct fw_dump *fadump_conf)
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pr_warn("Could not reset (%llu) kernel metadata tag!\n", ret);
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}
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/*
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* Convert CPU state data saved at the time of crash into ELF notes.
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*
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* Append crashing CPU's register data saved by the kernel in the PT_NOTE.
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*/
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static int __init
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opal_fadump_build_cpu_notes(struct fw_dump *fadump_conf,
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struct fadump_crash_info_header *fdh)
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{
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u32 num_cpus = 1, *note_buf;
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int rc;
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if (fdh->crashing_cpu == FADUMP_CPU_UNKNOWN)
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return -ENODEV;
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/* Allocate CPU notes buffer to hold crashing cpu notes. */
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rc = fadump_setup_cpu_notes_buf(num_cpus);
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if (rc != 0)
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return rc;
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note_buf = (u32 *)fadump_conf->cpu_notes_buf_vaddr;
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note_buf = fadump_regs_to_elf_notes(note_buf, &(fdh->regs));
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final_note(note_buf);
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pr_debug("Updating elfcore header (%llx) with cpu notes\n",
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fdh->elfcorehdr_addr);
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fadump_update_elfcore_header(__va(fdh->elfcorehdr_addr));
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return 0;
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}
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static int __init opal_fadump_process(struct fw_dump *fadump_conf)
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{
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return -EINVAL;
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struct fadump_crash_info_header *fdh;
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int rc = -EINVAL;
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if (!opal_fdm_active || !fadump_conf->fadumphdr_addr)
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return rc;
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/* Validate the fadump crash info header */
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fdh = __va(fadump_conf->fadumphdr_addr);
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if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
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pr_err("Crash info header is not valid.\n");
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return rc;
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}
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rc = opal_fadump_build_cpu_notes(fadump_conf, fdh);
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if (rc)
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return rc;
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/*
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* We are done validating dump info and elfcore header is now ready
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* to be exported. set elfcorehdr_addr so that vmcore module will
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* export the elfcore header through '/proc/vmcore'.
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*/
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elfcorehdr_addr = fdh->elfcorehdr_addr;
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return rc;
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}
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static void opal_fadump_region_show(struct fw_dump *fadump_conf,
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struct seq_file *m)
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{
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const struct opal_fadump_mem_struct *fdm_ptr = opal_fdm;
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const struct opal_fadump_mem_struct *fdm_ptr;
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u64 dumped_bytes = 0;
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int i;
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if (fadump_conf->dump_active)
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fdm_ptr = opal_fdm_active;
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else
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fdm_ptr = opal_fdm;
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for (i = 0; i < fdm_ptr->region_cnt; i++) {
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/*
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* Only regions that are registered for MPIPL
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* would have dump data.
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*/
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if ((fadump_conf->dump_active) &&
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(i < fdm_ptr->registered_regions))
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dumped_bytes = fdm_ptr->rgn[i].size;
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seq_printf(m, "DUMP: Src: %#016llx, Dest: %#016llx, ",
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fdm_ptr->rgn[i].src, fdm_ptr->rgn[i].dest);
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seq_printf(m, "Size: %#llx, Dumped: %#llx bytes\n",
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fdm_ptr->rgn[i].size, dumped_bytes);
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}
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/* Dump is active. Show reserved area start address. */
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if (fadump_conf->dump_active) {
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seq_printf(m, "\nMemory above %#016lx is reserved for saving crash dump\n",
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fadump_conf->reserve_dump_area_start);
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}
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}
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static void opal_fadump_trigger(struct fadump_crash_info_header *fdh,
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@ -257,7 +363,11 @@ static struct fadump_ops opal_fadump_ops = {
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void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
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{
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const __be32 *prop;
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unsigned long dn;
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u64 addr = 0;
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s64 ret;
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/*
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* Check if Firmware-Assisted Dump is supported. if yes, check
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@ -276,4 +386,37 @@ void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
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fadump_conf->ops = &opal_fadump_ops;
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fadump_conf->fadump_supported = 1;
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/*
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* Check if dump has been initiated on last reboot.
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*/
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prop = of_get_flat_dt_prop(dn, "mpipl-boot", NULL);
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if (!prop)
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return;
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ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_KERNEL, &addr);
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if ((ret != OPAL_SUCCESS) || !addr) {
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pr_err("Failed to get Kernel metadata (%lld)\n", ret);
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return;
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}
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addr = be64_to_cpu(addr);
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pr_debug("Kernel metadata addr: %llx\n", addr);
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opal_fdm_active = __va(addr);
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if (opal_fdm_active->version != OPAL_FADUMP_VERSION) {
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pr_warn("Supported kernel metadata version: %u, found: %d!\n",
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OPAL_FADUMP_VERSION, opal_fdm_active->version);
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pr_warn("WARNING: Kernel metadata format mismatch identified! Core file maybe corrupted..\n");
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}
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/* Kernel regions not registered with f/w for MPIPL */
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if (opal_fdm_active->registered_regions == 0) {
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opal_fdm_active = NULL;
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return;
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}
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pr_info("Firmware-assisted dump is active.\n");
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fadump_conf->dump_active = 1;
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opal_fadump_get_config(fadump_conf, opal_fdm_active);
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}
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