[PATCH v2 3/3] pstore: add pstore support on powernv

[Hari Bathini <hbathini@linux.vnet.ibm.com>]

This patch extends pstore, a generic interface to platform dependent
persistent storage, support for powernv  platform to capture certain
useful information, during dying moments. Such support is already in
place for  pseries platform.  This patch re-uses most of that code.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/nvram_64.c              |   25 +++++++++++++++++++++++--
 arch/powerpc/platforms/powernv/opal-nvram.c |   10 ++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index dbff7f0..3afbc91 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -127,6 +127,14 @@ static size_t oops_data_sz;
 static struct z_stream_s stream;
 
 #ifdef CONFIG_PSTORE
+#ifdef CONFIG_PPC_POWERNV
+static struct nvram_os_partition skiboot_partition = {
+	.name = "ibm,skiboot",
+	.index = -1,
+	.os_partition = false
+};
+#endif
+
 #ifdef CONFIG_PPC_PSERIES
 static struct nvram_os_partition of_config_partition = {
 	.name = "of-config",
@@ -479,6 +487,16 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
 		time->tv_nsec = 0;
 		break;
 #endif
+#ifdef CONFIG_PPC_POWERNV
+	case PSTORE_TYPE_PPC_OPAL:
+		sig = NVRAM_SIG_FW;
+		part = &skiboot_partition;
+		*type = PSTORE_TYPE_PPC_OPAL;
+		*id = PSTORE_TYPE_PPC_OPAL;
+		time->tv_sec = 0;
+		time->tv_nsec = 0;
+		break;
+#endif
 	default:
 		return 0;
 	}
@@ -554,8 +572,11 @@ static int nvram_pstore_init(void)
 {
 	int rc = 0;
 
-	nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
-	nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
+	if (machine_is(pseries)) {
+		nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
+		nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
+	} else
+		nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL;
 
 	nvram_pstore_info.buf = oops_data;
 	nvram_pstore_info.bufsize = oops_data_sz;
diff --git a/arch/powerpc/platforms/powernv/opal-nvram.c b/arch/powerpc/platforms/powernv/opal-nvram.c
index f9896fd..9db4398 100644
--- a/arch/powerpc/platforms/powernv/opal-nvram.c
+++ b/arch/powerpc/platforms/powernv/opal-nvram.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 
 #include <asm/opal.h>
+#include <asm/nvram.h>
 #include <asm/machdep.h>
 
 static unsigned int nvram_size;
@@ -62,6 +63,15 @@ static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
 	return count;
 }
 
+static int __init opal_nvram_init_log_partitions(void)
+{
+	/* Scan nvram for partitions */
+	nvram_scan_partitions();
+	nvram_init_oops_partition(0);
+	return 0;
+}
+machine_arch_initcall(powernv, opal_nvram_init_log_partitions);
+
 void __init opal_nvram_init(void)
 {
 	struct device_node *np;