[SCSI] hpsa: allow user to disable accelerated i/o path
Allow SSD Smart Path for a controller to be disabled by
the user, regardless of settings in controller firmware
or array configuration.
To disable: echo 0 > /sys/class/scsi_host/host<id>/acciopath_status
To re-enable: echo 1 > /sys/class/scsi_host/host<id>/acciopath_status
To check state: cat /sys/class/scsi_host/host<id>/acciopath_status
Signed-off-by: Scott Teel <scott.teel@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 7cd2871..a599a7b 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -287,6 +287,30 @@
return 1;
}
+static ssize_t host_store_hp_ssd_smart_path_status(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int status, len;
+ struct ctlr_info *h;
+ struct Scsi_Host *shost = class_to_shost(dev);
+ char tmpbuf[10];
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ len = count > sizeof(tmpbuf) - 1 ? sizeof(tmpbuf) - 1 : count;
+ strncpy(tmpbuf, buf, len);
+ tmpbuf[len] = '\0';
+ if (sscanf(tmpbuf, "%d", &status) != 1)
+ return -EINVAL;
+ h = shost_to_hba(shost);
+ h->acciopath_status = !!status;
+ dev_warn(&h->pdev->dev,
+ "hpsa: HP SSD Smart Path %s via sysfs update.\n",
+ h->acciopath_status ? "enabled" : "disabled");
+ return count;
+}
+
static ssize_t host_store_rescan(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -334,6 +358,17 @@
"performant" : "simple");
}
+static ssize_t host_show_hp_ssd_smart_path_status(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ctlr_info *h;
+ struct Scsi_Host *shost = class_to_shost(dev);
+
+ h = shost_to_hba(shost);
+ return snprintf(buf, 30, "HP SSD Smart Path %s\n",
+ (h->acciopath_status == 1) ? "enabled" : "disabled");
+}
+
/* List of controllers which cannot be hard reset on kexec with reset_devices */
static u32 unresettable_controller[] = {
0x324a103C, /* Smart Array P712m */
@@ -546,6 +581,9 @@
static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
static DEVICE_ATTR(hp_ssd_smart_path_enabled, S_IRUGO,
host_show_hp_ssd_smart_path_enabled, NULL);
+static DEVICE_ATTR(hp_ssd_smart_path_status, S_IWUSR|S_IRUGO|S_IROTH,
+ host_show_hp_ssd_smart_path_status,
+ host_store_hp_ssd_smart_path_status);
static DEVICE_ATTR(firmware_revision, S_IRUGO,
host_show_firmware_revision, NULL);
static DEVICE_ATTR(commands_outstanding, S_IRUGO,
@@ -569,6 +607,7 @@
&dev_attr_commands_outstanding,
&dev_attr_transport_mode,
&dev_attr_resettable,
+ &dev_attr_hp_ssd_smart_path_status,
NULL,
};
@@ -3341,7 +3380,8 @@
* Retries always go down the normal I/O path.
*/
if (likely(cmd->retries == 0 &&
- cmd->request->cmd_type == REQ_TYPE_FS)) {
+ cmd->request->cmd_type == REQ_TYPE_FS &&
+ h->acciopath_status)) {
if (dev->offload_enabled) {
rc = hpsa_scsi_ioaccel_raid_map(h, c);
if (rc == 0)
@@ -6326,6 +6366,9 @@
goto reinit_after_soft_reset;
}
+ /* Enable Accelerated IO path at driver layer */
+ h->acciopath_status = 1;
+
/* Turn the interrupts on so we can service requests */
h->access.set_intr_mask(h, HPSA_INTR_ON);
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 45bb1ea..1d3340d 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -181,6 +181,7 @@
#define HPSATMF_LOG_QRY_TSET (1 << 24)
#define HPSATMF_LOG_QRY_ASYNC (1 << 25)
u32 events;
+ int acciopath_status;
};
#define HPSA_ABORT_MSG 0
#define HPSA_DEVICE_RESET_MSG 1