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[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>
This commit is contained in:
Scott Teel 2014-02-18 13:57:00 -06:00 committed by James Bottomley
parent 6b80b18fe5
commit da0697bd30
3 changed files with 61 additions and 1 deletions
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16
Documentation/ABI/testing/sysfs-class-scsi_host
View File

@ -11,3 +11,19 @@ Description:
guaranteed. The 'isci_id' attribute unambiguously identifies
the controller index: '0' for the first controller,
'1' for the second.
What: /sys/class/scsi_host/hostX/acciopath_status
Date: November 2013
Contact: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Description: This file contains the current status of the "SSD Smart Path"
feature of HP Smart Array RAID controllers using the hpsa
driver. SSD Smart Path, when enabled permits the driver to
send i/o requests directly to physical devices that are part
of a logical drive, bypassing the controllers firmware RAID
stack for a performance advantage when possible. A value of
'1' indicates the feature is enabled, and the controller may
use the direct i/o path to physical devices. A value of zero
means the feature is disabled and the controller may not use
the direct i/o path to physical devices. This setting is
controller wide, affecting all configured logical drives on the
controller. This file is readable and writable.

45
drivers/scsi/hpsa.c
View File

@ -287,6 +287,30 @@ static int check_for_busy(struct ctlr_info *h, struct CommandList *c)
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 @@ static ssize_t host_show_transport_mode(struct device *dev,
"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(unique_id, S_IRUGO, unique_id_show, NULL);
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 @@ static struct device_attribute *hpsa_shost_attrs[] = {
&dev_attr_commands_outstanding,
&dev_attr_transport_mode,
&dev_attr_resettable,
&dev_attr_hp_ssd_smart_path_status,
NULL,
};
@ -3341,7 +3380,8 @@ static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
* 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 @@ reinit_after_soft_reset:
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);

1
drivers/scsi/hpsa.h
View File

@ -181,6 +181,7 @@ struct ctlr_info {
#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