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authorVikas Chaudhary <vikas.chaudhary@qlogic.com>2011-08-12 02:51:28 -0700
committerJames Bottomley <JBottomley@Parallels.com>2011-08-27 08:36:46 -0600
commit2944369144548432f3a5ffce7a2926bfb4ce4f0a (patch)
treec42de87060c88ed22224e828fbd81a83f33a03e7 /drivers/scsi/scsi_sysfs.c
parent6085491c34b37fa806f70ccd3fb2bf08416e9e98 (diff)
[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>
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
-rw-r--r--drivers/scsi/scsi_sysfs.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index e0bd3f790fca..04c2a278076e 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -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
};