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-rw-r--r--fs/pstore/platform.c83
1 files changed, 74 insertions, 9 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 03ce7a9b81c..5ea2e77ff02 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -1,6 +1,7 @@
/*
* Persistent Storage - platform driver interface parts.
*
+ * Copyright (C) 2007-2008 Google, Inc.
* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
*
* This program is free software; you can redistribute it and/or modify
@@ -22,6 +23,7 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kmsg_dump.h>
+#include <linux/console.h>
#include <linux/module.h>
#include <linux/pstore.h>
#include <linux/string.h>
@@ -29,6 +31,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/hardirq.h>
+#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include "internal.h"
@@ -38,7 +41,12 @@
* whether the system is actually still running well enough
* to let someone see the entry
*/
-#define PSTORE_INTERVAL (60 * HZ)
+static int pstore_update_ms = -1;
+module_param_named(update_ms, pstore_update_ms, int, 0600);
+MODULE_PARM_DESC(update_ms, "milliseconds before pstore updates its content "
+ "(default is -1, which means runtime updates are disabled; "
+ "enabling this option is not safe, it may lead to further "
+ "corruption on Oopses)");
static int pstore_new_entry;
@@ -53,7 +61,7 @@ static DECLARE_WORK(pstore_work, pstore_dowork);
* calls to pstore_register()
*/
static DEFINE_SPINLOCK(pstore_lock);
-static struct pstore_info *psinfo;
+struct pstore_info *psinfo;
static char *backend;
@@ -128,7 +136,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
break;
ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
- hsize + len, psinfo);
+ oopscount, hsize + len, psinfo);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
@@ -146,6 +154,55 @@ static struct kmsg_dumper pstore_dumper = {
.dump = pstore_dump,
};
+#ifdef CONFIG_PSTORE_CONSOLE
+static void pstore_console_write(struct console *con, const char *s, unsigned c)
+{
+ const char *e = s + c;
+
+ while (s < e) {
+ unsigned long flags;
+ u64 id;
+
+ if (c > psinfo->bufsize)
+ c = psinfo->bufsize;
+
+ if (oops_in_progress) {
+ if (!spin_trylock_irqsave(&psinfo->buf_lock, flags))
+ break;
+ } else {
+ spin_lock_irqsave(&psinfo->buf_lock, flags);
+ }
+ memcpy(psinfo->buf, s, c);
+ psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, c, psinfo);
+ spin_unlock_irqrestore(&psinfo->buf_lock, flags);
+ s += c;
+ c = e - s;
+ }
+}
+
+static struct console pstore_console = {
+ .name = "pstore",
+ .write = pstore_console_write,
+ .flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME,
+ .index = -1,
+};
+
+static void pstore_register_console(void)
+{
+ register_console(&pstore_console);
+}
+#else
+static void pstore_register_console(void) {}
+#endif
+
+static int pstore_write_compat(enum pstore_type_id type,
+ enum kmsg_dump_reason reason,
+ u64 *id, unsigned int part, int count,
+ size_t size, struct pstore_info *psi)
+{
+ return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
+}
+
/*
* platform specific persistent storage driver registers with
* us here. If pstore is already mounted, call the platform
@@ -170,6 +227,8 @@ int pstore_register(struct pstore_info *psi)
return -EINVAL;
}
+ if (!psi->write)
+ psi->write = pstore_write_compat;
psinfo = psi;
mutex_init(&psinfo->read_mutex);
spin_unlock(&pstore_lock);
@@ -183,9 +242,14 @@ int pstore_register(struct pstore_info *psi)
pstore_get_records(0);
kmsg_dump_register(&pstore_dumper);
+ pstore_register_console();
+ pstore_register_ftrace();
- pstore_timer.expires = jiffies + PSTORE_INTERVAL;
- add_timer(&pstore_timer);
+ if (pstore_update_ms >= 0) {
+ pstore_timer.expires = jiffies +
+ msecs_to_jiffies(pstore_update_ms);
+ add_timer(&pstore_timer);
+ }
return 0;
}
@@ -203,6 +267,7 @@ void pstore_get_records(int quiet)
char *buf = NULL;
ssize_t size;
u64 id;
+ int count;
enum pstore_type_id type;
struct timespec time;
int failed = 0, rc;
@@ -214,9 +279,9 @@ void pstore_get_records(int quiet)
if (psi->open && psi->open(psi))
goto out;
- while ((size = psi->read(&id, &type, &time, &buf, psi)) > 0) {
- rc = pstore_mkfile(type, psi->name, id, buf, (size_t)size,
- time, psi);
+ while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) {
+ rc = pstore_mkfile(type, psi->name, id, count, buf,
+ (size_t)size, time, psi);
kfree(buf);
buf = NULL;
if (rc && (rc != -EEXIST || !quiet))
@@ -244,7 +309,7 @@ static void pstore_timefunc(unsigned long dummy)
schedule_work(&pstore_work);
}
- mod_timer(&pstore_timer, jiffies + PSTORE_INTERVAL);
+ mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
}
module_param(backend, charp, 0444);