linux-kernel - [PATCH 3/8] Introduce generic read function to read nvram-partitions

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Message-ID: <20130410072125.20150.97063.stgit@aruna-ThinkPad-T420>
Date:	Wed, 10 Apr 2013 12:51:25 +0530
From:	Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>
To:	linuxppc-dev@...abs.org, paulus@...ba.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org
Cc:	jkenisto@...ux.vnet.ibm.com, mahesh@...ux.vnet.ibm.com,
	anton@...ba.org, ananth@...ibm.com
Subject: [PATCH 3/8] Introduce generic read function to read nvram-partitions

Introduce generic read function to read nvram partitions other than rtas.
nvram_read_error_log will be retained which is used to read rtas partition
from rtasd. nvram_read_partition is the generic read function to read from
any nvram partition.

Signed-off-by: Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>
Reviewed-by: Jim Keniston <jkenisto@...ibm.com>
---
 arch/powerpc/platforms/pseries/nvram.c |   34 +++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 742735a..6701b71 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -293,34 +293,37 @@ int nvram_write_error_log(char * buff, int length,
 	return rc;
 }
 
-/* nvram_read_error_log
+/* nvram_read_partition
  *
- * Reads nvram for error log for at most 'length'
+ * Reads nvram partition for at most 'length'
  */
-int nvram_read_error_log(char * buff, int length,
-                         unsigned int * err_type, unsigned int * error_log_cnt)
+int nvram_read_partition(struct nvram_os_partition *part, char *buff,
+			int length, unsigned int *err_type,
+			unsigned int *error_log_cnt)
 {
 	int rc;
 	loff_t tmp_index;
 	struct err_log_info info;
 	
-	if (rtas_log_partition.index == -1)
+	if (part->index == -1)
 		return -1;
 
-	if (length > rtas_log_partition.size)
-		length = rtas_log_partition.size;
+	if (length > part->size)
+		length = part->size;
 
-	tmp_index = rtas_log_partition.index;
+	tmp_index = part->index;
 
 	rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
 	if (rc <= 0) {
-		printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
+		printk(KERN_ERR "nvram_read_partition: "
+				"Failed nvram_read (%d)\n", rc);
 		return rc;
 	}
 
 	rc = ppc_md.nvram_read(buff, length, &tmp_index);
 	if (rc <= 0) {
-		printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
+		printk(KERN_ERR "nvram_read_partition: "
+				"Failed nvram_read (%d)\n", rc);
 		return rc;
 	}
 
@@ -330,6 +333,17 @@ int nvram_read_error_log(char * buff, int length,
 	return 0;
 }
 
+/* nvram_read_error_log
+ *
+ * Reads nvram for error log for at most 'length'
+ */
+int nvram_read_error_log(char *buff, int length,
+			unsigned int *err_type, unsigned int *error_log_cnt)
+{
+	return nvram_read_partition(&rtas_log_partition, buff, length,
+						err_type, error_log_cnt);
+}
+
 /* This doesn't actually zero anything, but it sets the event_logged
  * word to tell that this event is safely in syslog.
  */

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