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