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ata: libata-sata: Fix device queue depth control

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The function __ata_change_queue_depth() uses the helper
ata_scsi_find_dev() to get the ata_device structure of a scsi device and
set that device maximum queue depth. However, when the ata device is
managed by libsas, ata_scsi_find_dev() returns NULL, turning
__ata_change_queue_depth() into a nop, which prevents the user from
setting the maximum queue depth of ATA devices used with libsas based
HBAs.

Fix this by renaming __ata_change_queue_depth() to
ata_change_queue_depth() and adding a pointer to the ata_device
structure of the target device as argument. This pointer is provided by
ata_scsi_change_queue_depth() using ata_scsi_find_dev() in the case of
a libata managed device and by sas_change_queue_depth() using
sas_to_ata_dev() in the case of a libsas managed ata device.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: John Garry <john.garry@huawei.com>
This commit is contained in:
Damien Le Moal 2022-09-24 15:18:26 +09:00
parent 6a8438de52
commit 141f3d6256
3 changed files with 16 additions and 15 deletions
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24
drivers/ata/libata-sata.c
View File

@ -1018,26 +1018,25 @@ DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
/**
* __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
* @ap: ATA port to which the device change the queue depth
* ata_change_queue_depth - Set a device maximum queue depth
* @ap: ATA port of the target device
* @dev: target ATA device
* @sdev: SCSI device to configure queue depth for
* @queue_depth: new queue depth
*
* libsas and libata have different approaches for associating a sdev to
* its ata_port.
* Helper to set a device maximum queue depth, usable with both libsas
* and libata.
*
*/
int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
int queue_depth)
int ata_change_queue_depth(struct ata_port *ap, struct ata_device *dev,
struct scsi_device *sdev, int queue_depth)
{
struct ata_device *dev;
unsigned long flags;
if (queue_depth < 1 || queue_depth == sdev->queue_depth)
if (!dev || !ata_dev_enabled(dev))
return sdev->queue_depth;
dev = ata_scsi_find_dev(ap, sdev);
if (!dev || !ata_dev_enabled(dev))
if (queue_depth < 1 || queue_depth == sdev->queue_depth)
return sdev->queue_depth;
/* NCQ enabled? */
@ -1059,7 +1058,7 @@ int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
return scsi_change_queue_depth(sdev, queue_depth);
}
EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
EXPORT_SYMBOL_GPL(ata_change_queue_depth);
/**
* ata_scsi_change_queue_depth - SCSI callback for queue depth config
@ -1080,7 +1079,8 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
return __ata_change_queue_depth(ap, sdev, queue_depth);
return ata_change_queue_depth(ap, ata_scsi_find_dev(ap, sdev),
sdev, queue_depth);
}
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);

3
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -872,7 +872,8 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth)
struct domain_device *dev = sdev_to_domain_dev(sdev);
if (dev_is_sata(dev))
return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
return ata_change_queue_depth(dev->sata_dev.ap,
sas_to_ata_dev(dev), sdev, depth);
if (!sdev->tagged_supported)
depth = 1;

4
include/linux/libata.h
View File

@ -1136,8 +1136,8 @@ extern int ata_scsi_slave_config(struct scsi_device *sdev);
extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
int queue_depth);
extern int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
int queue_depth);
extern int ata_change_queue_depth(struct ata_port *ap, struct ata_device *dev,
struct scsi_device *sdev, int queue_depth);
extern struct ata_device *ata_dev_pair(struct ata_device *adev);
extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);