mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 04:26:40 +07:00
9f6af27fb6
pstore_dump() can be called with many different "reason" codes. Save the name of the code in the persistent store record. Also - only worthwhile calling pstore_mkfile for KMSG_DUMP_OOPS - that is the only one where the kernel will continue running. Reviewed-by: Seiji Aguchi <seiji.aguchi@hds.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
202 lines
4.9 KiB
C
202 lines
4.9 KiB
C
/*
|
|
* Persistent Storage - platform driver interface parts.
|
|
*
|
|
* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kmsg_dump.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pstore.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "internal.h"
|
|
|
|
/*
|
|
* pstore_lock just protects "psinfo" during
|
|
* calls to pstore_register()
|
|
*/
|
|
static DEFINE_SPINLOCK(pstore_lock);
|
|
static struct pstore_info *psinfo;
|
|
|
|
/* How much of the console log to snapshot */
|
|
static unsigned long kmsg_bytes = 10240;
|
|
|
|
void pstore_set_kmsg_bytes(int bytes)
|
|
{
|
|
kmsg_bytes = bytes;
|
|
}
|
|
|
|
/* Tag each group of saved records with a sequence number */
|
|
static int oopscount;
|
|
|
|
static char *reason_str[] = {
|
|
"Oops", "Panic", "Kexec", "Restart", "Halt", "Poweroff", "Emergency"
|
|
};
|
|
|
|
/*
|
|
* callback from kmsg_dump. (s2,l2) has the most recently
|
|
* written bytes, older bytes are in (s1,l1). Save as much
|
|
* as we can from the end of the buffer.
|
|
*/
|
|
static void pstore_dump(struct kmsg_dumper *dumper,
|
|
enum kmsg_dump_reason reason,
|
|
const char *s1, unsigned long l1,
|
|
const char *s2, unsigned long l2)
|
|
{
|
|
unsigned long s1_start, s2_start;
|
|
unsigned long l1_cpy, l2_cpy;
|
|
unsigned long size, total = 0;
|
|
char *dst, *why;
|
|
u64 id;
|
|
int hsize, part = 1;
|
|
|
|
if (reason < ARRAY_SIZE(reason_str))
|
|
why = reason_str[reason];
|
|
else
|
|
why = "Unknown";
|
|
|
|
mutex_lock(&psinfo->buf_mutex);
|
|
oopscount++;
|
|
while (total < kmsg_bytes) {
|
|
dst = psinfo->buf;
|
|
hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part++);
|
|
size = psinfo->bufsize - hsize;
|
|
dst += hsize;
|
|
|
|
l2_cpy = min(l2, size);
|
|
l1_cpy = min(l1, size - l2_cpy);
|
|
|
|
if (l1_cpy + l2_cpy == 0)
|
|
break;
|
|
|
|
s2_start = l2 - l2_cpy;
|
|
s1_start = l1 - l1_cpy;
|
|
|
|
memcpy(dst, s1 + s1_start, l1_cpy);
|
|
memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
|
|
|
|
id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy);
|
|
if (reason == KMSG_DUMP_OOPS && pstore_is_mounted())
|
|
pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id,
|
|
psinfo->buf, hsize + l1_cpy + l2_cpy,
|
|
CURRENT_TIME, psinfo->erase);
|
|
l1 -= l1_cpy;
|
|
l2 -= l2_cpy;
|
|
total += l1_cpy + l2_cpy;
|
|
}
|
|
mutex_unlock(&psinfo->buf_mutex);
|
|
}
|
|
|
|
static struct kmsg_dumper pstore_dumper = {
|
|
.dump = pstore_dump,
|
|
};
|
|
|
|
/*
|
|
* platform specific persistent storage driver registers with
|
|
* us here. If pstore is already mounted, call the platform
|
|
* read function right away to populate the file system. If not
|
|
* then the pstore mount code will call us later to fill out
|
|
* the file system.
|
|
*
|
|
* Register with kmsg_dump to save last part of console log on panic.
|
|
*/
|
|
int pstore_register(struct pstore_info *psi)
|
|
{
|
|
struct module *owner = psi->owner;
|
|
|
|
spin_lock(&pstore_lock);
|
|
if (psinfo) {
|
|
spin_unlock(&pstore_lock);
|
|
return -EBUSY;
|
|
}
|
|
psinfo = psi;
|
|
spin_unlock(&pstore_lock);
|
|
|
|
if (owner && !try_module_get(owner)) {
|
|
psinfo = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pstore_is_mounted())
|
|
pstore_get_records();
|
|
|
|
kmsg_dump_register(&pstore_dumper);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pstore_register);
|
|
|
|
/*
|
|
* Read all the records from the persistent store. Create and
|
|
* file files in our filesystem.
|
|
*/
|
|
void pstore_get_records(void)
|
|
{
|
|
struct pstore_info *psi = psinfo;
|
|
size_t size;
|
|
u64 id;
|
|
enum pstore_type_id type;
|
|
struct timespec time;
|
|
int failed = 0;
|
|
|
|
if (!psi)
|
|
return;
|
|
|
|
mutex_lock(&psinfo->buf_mutex);
|
|
while ((size = psi->read(&id, &type, &time)) > 0) {
|
|
if (pstore_mkfile(type, psi->name, id, psi->buf, size,
|
|
time, psi->erase))
|
|
failed++;
|
|
}
|
|
mutex_unlock(&psinfo->buf_mutex);
|
|
|
|
if (failed)
|
|
printk(KERN_WARNING "pstore: failed to load %d record(s) from '%s'\n",
|
|
failed, psi->name);
|
|
}
|
|
|
|
/*
|
|
* Call platform driver to write a record to the
|
|
* persistent store.
|
|
*/
|
|
int pstore_write(enum pstore_type_id type, char *buf, size_t size)
|
|
{
|
|
u64 id;
|
|
|
|
if (!psinfo)
|
|
return -ENODEV;
|
|
|
|
if (size > psinfo->bufsize)
|
|
return -EFBIG;
|
|
|
|
mutex_lock(&psinfo->buf_mutex);
|
|
memcpy(psinfo->buf, buf, size);
|
|
id = psinfo->write(type, size);
|
|
if (pstore_is_mounted())
|
|
pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, psinfo->buf,
|
|
size, CURRENT_TIME, psinfo->erase);
|
|
mutex_unlock(&psinfo->buf_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pstore_write);
|