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libata: cleanup NCQ priority handling

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The ata device flag ATA_DFLAG_NCQ_PRIO indicates if a device supports
the NCQ Priority feature while the ATA_DFLAG_NCQ_PRIO_ENABLE device
flag indicates if the feature is enabled. Enabling NCQ priority use is
controlled by the user through the device sysfs attribute
ncq_prio_enable. As a result, the ATA_DFLAG_NCQ_PRIO flag should not be
cleared when ATA_DFLAG_NCQ_PRIO_ENABLE is not set as the device still
supports the feature even after the user disables it. This leads to the
following cleanups:
- In ata_build_rw_tf(), set a command high priority bit based on the
  ATA_DFLAG_NCQ_PRIO_ENABLE flag, not on the ATA_DFLAG_NCQ flag. That
  is, set a command high priority only if the user enabled NCQ priority
  use.
- In ata_dev_config_ncq_prio(), ATA_DFLAG_NCQ_PRIO should not be cleared
  if ATA_DFLAG_NCQ_PRIO_ENABLE is not set. If the device does not
  support NCQ priority, both ATA_DFLAG_NCQ_PRIO and
  ATA_DFLAG_NCQ_PRIO_ENABLE must be cleared.

With the above ata_dev_config_ncq_prio() change, ATA_DFLAG_NCQ_PRIO flag
is set on device scan and revalidation. There is no need to trigger a
device revalidation in ata_ncq_prio_enable_store() when the user enables
the use of NCQ priority. Remove the revalidation code from that funciton
to simplify it. Also change the return value from -EIO to -EINVAL when a
user tries to enable NCQ priority for a device that does not support
this feature.  While at it, also simplify ata_ncq_prio_enable_show().

Overall, there is no functional change introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210816014456.2191776-7-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2021-08-16 10:44:51 +09:00 committed by Jens Axboe
parent 891fd7c619
commit 2360fa1812
2 changed files with 26 additions and 43 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
drivers/ata/libata-core.c
View file

@ -712,11 +712,9 @@ int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
if (tf->flags & ATA_TFLAG_FUA)
tf->device |= 1 << 7;
if (dev->flags & ATA_DFLAG_NCQ_PRIO) {
if (class == IOPRIO_CLASS_RT)
tf->hob_nsect |= ATA_PRIO_HIGH <<
ATA_SHIFT_PRIO;
}
if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE &&
class == IOPRIO_CLASS_RT)
tf->hob_nsect |= ATA_PRIO_HIGH << ATA_SHIFT_PRIO;
} else if (dev->flags & ATA_DFLAG_LBA) {
tf->flags |= ATA_TFLAG_LBA;
@ -2178,11 +2176,6 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
struct ata_port *ap = dev->link->ap;
unsigned int err_mask;
if (!(dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
return;
}
err_mask = ata_read_log_page(dev,
ATA_LOG_IDENTIFY_DEVICE,
ATA_LOG_SATA_SETTINGS,
@ -2190,18 +2183,21 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
1);
if (err_mask) {
ata_dev_dbg(dev,
"failed to get Identify Device data, Emask 0x%x\n",
"failed to get SATA settings log, Emask 0x%x\n",
err_mask);
return;
goto not_supported;
}
if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)) {
dev->flags |= ATA_DFLAG_NCQ_PRIO;
} else {
dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
ata_dev_dbg(dev, "SATA page does not support priority\n");
}
if (!(ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)))
goto not_supported;
dev->flags |= ATA_DFLAG_NCQ_PRIO;
return;
not_supported:
dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
}
static int ata_dev_config_ncq(struct ata_device *dev,

37
drivers/ata/libata-sata.c
View file

@ -839,23 +839,17 @@ static ssize_t ata_ncq_prio_enable_show(struct device *device,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(device);
struct ata_port *ap;
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev;
bool ncq_prio_enable;
int rc = 0;
ap = ata_shost_to_port(sdev->host);
spin_lock_irq(ap->lock);
dev = ata_scsi_find_dev(ap, sdev);
if (!dev) {
if (!dev)
rc = -ENODEV;
goto unlock;
}
ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
unlock:
else
ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
spin_unlock_irq(ap->lock);
return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
@ -869,7 +863,7 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device,
struct ata_port *ap;
struct ata_device *dev;
long int input;
int rc;
int rc = 0;
rc = kstrtol(buf, 10, &input);
if (rc)
@ -883,27 +877,20 @@ static ssize_t ata_ncq_prio_enable_store(struct device *device,
return -ENODEV;
spin_lock_irq(ap->lock);
if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
rc = -EINVAL;
goto unlock;
}
if (input)
dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
else
dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
dev->link->eh_info.action |= ATA_EH_REVALIDATE;
dev->link->eh_info.flags |= ATA_EHI_QUIET;
ata_port_schedule_eh(ap);
unlock:
spin_unlock_irq(ap->lock);
ata_port_wait_eh(ap);
if (input) {
spin_lock_irq(ap->lock);
if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
rc = -EIO;
}
spin_unlock_irq(ap->lock);
}
return rc ? rc : len;
}