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scsi: smartpqi: Add host level stream detection enable

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Allow R5/R6 stream detection to be disabled/enabled using sysfs entry
enable_stream_detection.

Example usage:

lsscsi
[2:2:0:0]    storage Adaptec  3258P-32i /e     0010
 ^
 |
 +---- NOTE: here host is host2

find /sys -name \*enable_stream\*
/sys/devices/pci0000:36/0000:36:00.0/0000:37:00.0/0000:38:00.0/0000:39:00.0/host2/scsi_host/host2/enable_stream_detection
/sys/devices/pci0000:5b/0000:5b:00.0/0000:5c:00.0/host3/scsi_host/host3/enable_stream_detection

Current stream detection:
cat /sys/devices/pci0000:36/0000:36:00.0/0000:37:00.0/0000:38:00.0/0000:39:00.0/host2/scsi_host/host2/enable_stream_detection
1

Turn off stream detection:
echo 0 > /sys/devices/pci0000:36/0000:36:00.0/0000:37:00.0/0000:38:00.0/0000:39:00.0/host2/scsi_host/host2/enable_stream_detection

Turn on stream detection:
echo 1 > /sys/devices/pci0000:36/0000:36:00.0/0000:37:00.0/0000:38:00.0/0000:39:00.0/host2/scsi_host/host2/enable_stream_detection

Link: https://lore.kernel.org/r/161549376281.25025.1132304698441513738.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Reviewed-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace 2021-03-11 14:16:02 -06:00 committed by Martin K. Petersen
parent c7ffedb3a7
commit 5be746d7d7
1 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/scsi/smartpqi/smartpqi_init.c
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@ -6696,6 +6696,34 @@ static ssize_t pqi_lockup_action_store(struct device *dev,
return -EINVAL;
}
static ssize_t pqi_host_enable_stream_detection_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
return scnprintf(buffer, 10, "%x\n",
ctrl_info->enable_stream_detection);
}
static ssize_t pqi_host_enable_stream_detection_store(struct device *dev,
struct device_attribute *attr, const char *buffer, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
u8 set_stream_detection = 0;
if (kstrtou8(buffer, 0, &set_stream_detection))
return -EINVAL;
if (set_stream_detection > 0)
set_stream_detection = 1;
ctrl_info->enable_stream_detection = set_stream_detection;
return count;
}
static ssize_t pqi_host_enable_r5_writes_show(struct device *dev,
struct device_attribute *attr, char *buffer)
{
@ -6758,6 +6786,9 @@ static DEVICE_ATTR(vendor, 0444, pqi_vendor_show, NULL);
static DEVICE_ATTR(rescan, 0200, NULL, pqi_host_rescan_store);
static DEVICE_ATTR(lockup_action, 0644, pqi_lockup_action_show,
pqi_lockup_action_store);
static DEVICE_ATTR(enable_stream_detection, 0644,
pqi_host_enable_stream_detection_show,
pqi_host_enable_stream_detection_store);
static DEVICE_ATTR(enable_r5_writes, 0644,
pqi_host_enable_r5_writes_show, pqi_host_enable_r5_writes_store);
static DEVICE_ATTR(enable_r6_writes, 0644,
@ -6771,6 +6802,7 @@ static struct device_attribute *pqi_shost_attrs[] = {
&dev_attr_vendor,
&dev_attr_rescan,
&dev_attr_lockup_action,
&dev_attr_enable_stream_detection,
&dev_attr_enable_r5_writes,
&dev_attr_enable_r6_writes,
NULL