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Subject[PATCH v3 5/8] powerpc/pseries: Read rtas partition via pstore
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This patch set exploits the pstore subsystem to read details of rtas partition
in NVRAM to a separate file in /dev/pstore. For instance, rtas details will be
stored in a file named [rtas-nvram-4].

Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Reviewed-by: Jim Keniston <jkenisto@us.ibm.com>
---
arch/powerpc/platforms/pseries/nvram.c | 33 +++++++++++++++++++++++++-------
fs/pstore/inode.c | 3 +++
include/linux/pstore.h | 2 ++
3 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 9edec8e..78d72f0 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -131,9 +131,11 @@ static struct z_stream_s stream;
#ifdef CONFIG_PSTORE
static enum pstore_type_id nvram_type_ids[] = {
PSTORE_TYPE_DMESG,
+ PSTORE_TYPE_PPC_RTAS,
-1
};
static int read_type;
+static unsigned long last_rtas_event;
#endif

static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
@@ -297,8 +299,13 @@ int nvram_write_error_log(char * buff, int length,
{
int rc = nvram_write_os_partition(&rtas_log_partition, buff, length,
err_type, error_log_cnt);
- if (!rc)
+ if (!rc) {
last_unread_rtas_event = get_seconds();
+#ifdef CONFIG_PSTORE
+ last_rtas_event = get_seconds();
+#endif
+ }
+
return rc;
}

@@ -506,7 +513,7 @@ static int nvram_pstore_write(enum pstore_type_id type,
}

/*
- * Reads the oops/panic report.
+ * Reads the oops/panic report and ibm,rtas-log partition.
* Returns the length of the data we read from each partition.
* Returns 0 if we've been called before.
*/
@@ -526,6 +533,12 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
part = &oops_log_partition;
*type = PSTORE_TYPE_DMESG;
break;
+ case PSTORE_TYPE_PPC_RTAS:
+ part = &rtas_log_partition;
+ *type = PSTORE_TYPE_PPC_RTAS;
+ time->tv_sec = last_rtas_event;
+ time->tv_nsec = 0;
+ break;
default:
return 0;
}
@@ -542,11 +555,17 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,

*count = 0;
*id = id_no;
- oops_hdr = (struct oops_log_info *)buff;
- *buf = buff + sizeof(*oops_hdr);
- time->tv_sec = oops_hdr->timestamp;
- time->tv_nsec = 0;
- return oops_hdr->report_length;
+
+ if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
+ oops_hdr = (struct oops_log_info *)buff;
+ *buf = buff + sizeof(*oops_hdr);
+ time->tv_sec = oops_hdr->timestamp;
+ time->tv_nsec = 0;
+ return oops_hdr->report_length;
+ }
+
+ *buf = buff;
+ return part->size;
}

static struct pstore_info nvram_pstore_info = {
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index e4bcb2c..ec24f9c 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -324,6 +324,9 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
case PSTORE_TYPE_MCE:
sprintf(name, "mce-%s-%lld", psname, id);
break;
+ case PSTORE_TYPE_PPC_RTAS:
+ sprintf(name, "rtas-%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 75d0176..d7a8fe9 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -35,6 +35,8 @@ enum pstore_type_id {
PSTORE_TYPE_MCE = 1,
PSTORE_TYPE_CONSOLE = 2,
PSTORE_TYPE_FTRACE = 3,
+ /* PPC64 partition types */
+ PSTORE_TYPE_PPC_RTAS = 4,
PSTORE_TYPE_UNKNOWN = 255
};



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