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Commit a5e4797b authored by Aruna Balakrishnaiah's avatar Aruna Balakrishnaiah Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: Read common partition via pstore 



This patch exploits pstore subsystem to read details of common partition
in NVRAM to a separate file in /dev/pstore. For instance, common partition
details will be stored in a file named [common-nvram-6].

Signed-off-by: default avatarAruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Reviewed-by: default avatarJim Keniston <jkenisto@us.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent f33f748c

arch/powerpc/platforms/pseries/nvram.c

+16 −1
Original line number Diff line number Diff line
@@ -138,10 +138,17 @@ static struct nvram_os_partition of_config_partition = { 
	.os_partition = false

};



static struct nvram_os_partition common_partition = {

	.name = "common",

	.index = -1,

	.os_partition = false

};



static enum pstore_type_id nvram_type_ids[] = {

	PSTORE_TYPE_DMESG,

	PSTORE_TYPE_PPC_RTAS,

	PSTORE_TYPE_PPC_OF,

	PSTORE_TYPE_PPC_COMMON,

	-1

};

static int read_type;
@@ -530,7 +537,7 @@ static int nvram_pstore_write(enum pstore_type_id type, 
}



/*

 * Reads the oops/panic report, rtas and of-config partition.

 * Reads the oops/panic report, rtas, of-config and common partition.

 * Returns the length of the data we read from each partition.

 * Returns 0 if we've been called before.

 */
@@ -566,6 +573,14 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type, 
		time->tv_sec = 0;

		time->tv_nsec = 0;

		break;

	case PSTORE_TYPE_PPC_COMMON:

		sig = NVRAM_SIG_SYS;

		part = &common_partition;

		*type = PSTORE_TYPE_PPC_COMMON;

		*id = PSTORE_TYPE_PPC_COMMON;

		time->tv_sec = 0;

		time->tv_nsec = 0;

		break;

	default:

		return 0;

	}

fs/pstore/inode.c

+3 −0
Original line number Diff line number Diff line
@@ -330,6 +330,9 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count, 
	case PSTORE_TYPE_PPC_OF:

		sprintf(name, "powerpc-ofw-%s-%lld", psname, id);

		break;

	case PSTORE_TYPE_PPC_COMMON:

		sprintf(name, "powerpc-common-%s-%lld", psname, id);

		break;

	case PSTORE_TYPE_UNKNOWN:

		sprintf(name, "unknown-%s-%lld", psname, id);

		break;

include/linux/pstore.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ enum pstore_type_id { 
	/* PPC64 partition types */

	PSTORE_TYPE_PPC_RTAS	= 4,

	PSTORE_TYPE_PPC_OF	= 5,

	PSTORE_TYPE_PPC_COMMON	= 6,

	PSTORE_TYPE_UNKNOWN	= 255

};