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[SCSI] scsi: Added support for adapter and firmware reset 

Added new sysfs attr 'host_reset' in scsi_sysfs.c to
perform adapter or firmware reset as suggested by
Mike Christie here:
http://marc.info/?l=linux-scsi&m=127359347111167&w=2

user/application can write "adapter" or "firmware" on
this attr and it will call newly added function hook
in scsi_host_template to call LDD adapter or firmware
reset implementation.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Vikas Chaudhary 2011-08-12 02:51:28 -07:00 committed by James Bottomley
parent 6085491c34
commit 2944369144
2 changed files with 51 additions and 0 deletions
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38
drivers/scsi/scsi_sysfs.c
View File

@ -246,6 +246,43 @@ show_shost_active_mode(struct device *dev,
static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
static int check_reset_type(char *str)
{
if (strncmp(str, "adapter", 10) == 0)
return SCSI_ADAPTER_RESET;
else if (strncmp(str, "firmware", 10) == 0)
return SCSI_FIRMWARE_RESET;
else
return 0;
}
static ssize_t
store_host_reset(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct scsi_host_template *sht = shost->hostt;
int ret = -EINVAL;
char str[10];
int type;
sscanf(buf, "%s", str);
type = check_reset_type(str);
if (!type)
goto exit_store_host_reset;
if (sht->host_reset)
ret = sht->host_reset(shost, type);
exit_store_host_reset:
if (ret == 0)
ret = count;
return ret;
}
static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
shost_rd_attr(unique_id, "%u\n");
shost_rd_attr(host_busy, "%hu\n");
shost_rd_attr(cmd_per_lun, "%hd\n");
@ -272,6 +309,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = {
&dev_attr_active_mode.attr,
&dev_attr_prot_capabilities.attr,
&dev_attr_prot_guard_type.attr,
&dev_attr_host_reset.attr,
NULL
};

13
include/scsi/scsi_host.h
View File

@ -355,6 +355,19 @@ struct scsi_host_template {
*/
enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/* This is an optional routine that allows transport to initiate
* LLD adapter or firmware reset using sysfs attribute.
*
* Return values: 0 on success, -ve value on failure.
*
* Status: OPTIONAL
*/
int (*host_reset)(struct Scsi_Host *shost, int reset_type);
#define SCSI_ADAPTER_RESET 1
#define SCSI_FIRMWARE_RESET 2
/*
* Name of proc directory
*/