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Date: Thu, 18 Oct 2012 14:06:07 +0300
From: dragos.tatulea@...el.com
To: ccross@...roid.com, keescook@...omium.org, tony.luck@...el.com,
cbouatmailru@...il.com, linux-kernel@...r.kernel.org
Cc: adrian.hunter@...el.com, octavian.purdila@...el.com,
Dragos Tatulea <dragos.tatulea@...el.com>
Subject: [PATCH v3 9/9] pstore: add android log dumping
From: Dragos Tatulea <dragos.tatulea@...el.com>
Dump android binary logs to pstore on panic.
Change-Id: I8ba59d498eae252f4c3844ece8be2a9c4979ecd2
Signed-off-by: Dragos Tatulea <dragos.tatulea@...el.com>
---
drivers/staging/android/Kconfig | 12 ++++++
drivers/staging/android/logger.c | 87 ++++++++++++++++++++++++++++++++++++++
fs/pstore/inode.c | 12 ++++++
include/linux/pstore.h | 16 ++++---
4 files changed, 121 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig
index 0ce50d1..72b0de3 100644
--- a/drivers/staging/android/Kconfig
+++ b/drivers/staging/android/Kconfig
@@ -49,6 +49,18 @@ config ANDROID_INTF_ALARM_DEV
elapsed realtime, and a non-wakeup alarm on the monotonic clock.
Also exports the alarm interface to user-space.
+config ANDROID_LOGGER_PANIC_DUMP
+ bool "Panic dump to pstore"
+ default n
+ depends on ANDROID_LOGGER
+ depends on PSTORE
+ help
+ This options allows the panic dumping of log data to persistent
+ storage. If the 'enabled' parameter is non-zero, during a panic
+ each log will be copied in binary format to pstore and, after
+ the next boot, will appear as files in the pstore file system.
+
+
endif # if ANDROID
endmenu
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 1d5ed47..f7f9c09 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -28,6 +28,7 @@
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
+#include <linux/pstore.h>
#include "logger.h"
#include <asm/ioctls.h>
@@ -653,6 +654,88 @@ out_free_buffer:
return ret;
}
+static int panic_dump;
+module_param(panic_dump, int, S_IRUSR | S_IWUSR);
+
+#ifdef CONFIG_ANDROID_LOGGER_PANIC_DUMP
+
+static void logger_pstore_dump(struct pstore_info *psinfo,
+ enum pstore_type_id type,
+ struct logger_log *log)
+{
+ size_t len1, len2, offs, w_offs;
+
+ /* Ignoring buffer locks because:
+ * - we are in an oops and it won't make any difference
+ * - it's just a read access so no danger of corrupting
+ * anything
+ */
+ offs = log->head;
+ w_offs = log->w_off;
+
+ if (offs < w_offs) {
+ len1 = w_offs - offs;
+ len2 = 0;
+ } else {
+ len1 = log->size - offs;
+ len2 = w_offs;
+ }
+
+ pstore_write(type, log->buffer + offs, len1);
+ pstore_write(type, log->buffer, len2);
+}
+
+static enum pstore_type_id get_pstore_log_type(const struct logger_log *log)
+{
+ enum pstore_type_id type = PSTORE_TYPE_UNKNOWN;
+
+ if (!strcmp(log->misc.name, LOGGER_LOG_MAIN))
+ type = PSTORE_TYPE_ANDROID_LOG_MAIN;
+ else if (!strcmp(log->misc.name, LOGGER_LOG_EVENTS))
+ type = PSTORE_TYPE_ANDROID_LOG_EVENTS;
+ else if (!strcmp(log->misc.name, LOGGER_LOG_RADIO))
+ type = PSTORE_TYPE_ANDROID_LOG_RADIO;
+ else if (!strcmp(log->misc.name, LOGGER_LOG_SYSTEM))
+ type = PSTORE_TYPE_ANDROID_LOG_SYSTEM;
+
+ return type;
+}
+
+static int pstore_notifier_cb(struct notifier_block *nb, unsigned long event,
+ void *_psinfo)
+{
+ struct pstore_info *psinfo = _psinfo;
+
+ if (!panic_dump || psinfo->ext_reason != KMSG_DUMP_PANIC)
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case PSTORE_DUMP: {
+ struct logger_log *log;
+ list_for_each_entry(log, &log_list, logs) {
+ logger_pstore_dump(psinfo,
+ get_pstore_log_type(log),
+ log);
+ }
+ break;
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block pstore_notifier = {
+ .notifier_call = pstore_notifier_cb,
+};
+
+MODULE_PARM_DESC(panic_dump, "set to 1 to enable panic dump, 0 to disable (default 0)");
+
+#else
+
+MODULE_PARM_DESC(panic_dump, "panic dump is not supported");
+
+#endif
+
static int __init logger_init(void)
{
int ret;
@@ -673,6 +756,10 @@ static int __init logger_init(void)
if (unlikely(ret))
goto out;
+#ifdef CONFIG_ANDROID_LOGGER_PANIC_DUMP
+ pstore_notifier_register(&pstore_notifier);
+#endif
+
out:
return ret;
}
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 5e20a8d..8b1179d 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -324,6 +324,18 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
case PSTORE_TYPE_TASK_DUMP:
sprintf(name, "tasks-%s-%lld", psname, id);
break;
+ case PSTORE_TYPE_ANDROID_LOG_MAIN:
+ sprintf(name, "android_log_main-%s-%lld", psname, id);
+ break;
+ case PSTORE_TYPE_ANDROID_LOG_EVENTS:
+ sprintf(name, "android_log_events-%s-%lld", psname, id);
+ break;
+ case PSTORE_TYPE_ANDROID_LOG_RADIO:
+ sprintf(name, "android_log_radio-%s-%lld", psname, id);
+ break;
+ case PSTORE_TYPE_ANDROID_LOG_SYSTEM:
+ sprintf(name, "android_log_system-%s-%lld", psname, id);
+ break;
case PSTORE_TYPE_UNKNOWN:
sprintf(name, "unknown-%s-%lld", psname, id);
break;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index 48dcafb..08b496a 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -31,12 +31,16 @@
/* types */
enum pstore_type_id {
- PSTORE_TYPE_DMESG = 0,
- PSTORE_TYPE_MCE = 1,
- PSTORE_TYPE_CONSOLE = 2,
- PSTORE_TYPE_FTRACE = 3,
- PSTORE_TYPE_TASK_DUMP = 4,
- PSTORE_TYPE_UNKNOWN = 255
+ PSTORE_TYPE_DMESG = 0,
+ PSTORE_TYPE_MCE = 1,
+ PSTORE_TYPE_CONSOLE = 2,
+ PSTORE_TYPE_FTRACE = 3,
+ PSTORE_TYPE_TASK_DUMP = 4,
+ PSTORE_TYPE_ANDROID_LOG_MAIN = 5,
+ PSTORE_TYPE_ANDROID_LOG_EVENTS = 6,
+ PSTORE_TYPE_ANDROID_LOG_RADIO = 7,
+ PSTORE_TYPE_ANDROID_LOG_SYSTEM = 8,
+ PSTORE_TYPE_UNKNOWN = 255
};
struct module;
--
1.7.9.5
--
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