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powerpc/pseries: Introduce generic read function to read nvram-partitions

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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@linux.vnet.ibm.com>
Reviewed-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aruna Balakrishnaiah 2013-06-06 00:21:16 +05:30 committed by Benjamin Herrenschmidt
parent b1f70e1f72
commit 126746101e
1 changed files with 22 additions and 10 deletions
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32
arch/powerpc/platforms/pseries/nvram.c
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@ -293,34 +293,35 @@ 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);
pr_err("%s: Failed nvram_read (%d)\n", __FUNCTION__, 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);
pr_err("%s: Failed nvram_read (%d)\n", __FUNCTION__, rc);
return rc;
}
@ -330,6 +331,17 @@ 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.
*/