The 10/19/2016 14:38, Tejun Heo wrote:
> Hello,
>
> Removed ata_ncq_prio_on() and renamed _on to _enable. If I messed up
> anything, please let me know.
>
Works as expected. Thanks for cleaning this up.
> Also, can you please send a follow-up patch to make the store function
> reject prio enabling if the device doesn't support it?
>
I'll send something out shortly.
Take care,
Adam
> Thanks.
>
> ------ 8< ------
> From 84f95243b5439a20c33837075b88926bfa00c4ec Mon Sep 17 00:00:00 2001
> From: Adam Manzanares <adam.manzana...@hgst.com>
> Date: Mon, 17 Oct 2016 11:27:30 -0700
> Subject: [PATCH 2/2] ata: ATA Command Priority Disabled By Default
>
> Add a sysfs entry to turn on priority information being passed
> to a ATA device. By default this feature is turned off.
>
> This patch depends on ata: Enabling ATA Command Priorities
>
> tj: Renamed ncq_prio_on to ncq_prio_enable and removed trivial
> ata_ncq_prio_on() and open-coded the test.
>
> Signed-off-by: Adam Manzanares <adam.manzana...@hgst.com>
> Signed-off-by: Tejun Heo <t...@kernel.org>
> ---
> drivers/ata/libahci.c | 1 +
> drivers/ata/libata-core.c | 3 ++-
> drivers/ata/libata-scsi.c | 68
> +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/libata.h | 2 ++
> 4 files changed, 73 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
> index 0d028ea..ee7db31 100644
> --- a/drivers/ata/libahci.c
> +++ b/drivers/ata/libahci.c
> @@ -140,6 +140,7 @@ EXPORT_SYMBOL_GPL(ahci_shost_attrs);
> struct device_attribute *ahci_sdev_attrs[] = {
> &dev_attr_sw_activity,
> &dev_attr_unload_heads,
> + &dev_attr_ncq_prio_enable,
> NULL
> };
> EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 8346faf..b294339 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -787,7 +787,8 @@ 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 ((dev->flags & ATA_DFLAG_NCQ_PRIO) &&
> + (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
> if (class == IOPRIO_CLASS_RT)
> tf->hob_nsect |= ATA_PRIO_HIGH <<
> ATA_SHIFT_PRIO;
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 2bccc3c..87597a3 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -271,6 +271,73 @@ DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
> ata_scsi_park_show, ata_scsi_park_store);
> EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
>
> +static ssize_t ata_ncq_prio_enable_show(struct device *device,
> + struct device_attribute *attr, char
> *buf)
> +{
> + struct scsi_device *sdev = to_scsi_device(device);
> + struct ata_port *ap;
> + 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) {
> + rc = -ENODEV;
> + goto unlock;
> + }
> +
> + ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
> +
> +unlock:
> + spin_unlock_irq(ap->lock);
> +
> + return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
> +}
> +
> +static ssize_t ata_ncq_prio_enable_store(struct device *device,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct scsi_device *sdev = to_scsi_device(device);
> + struct ata_port *ap;
> + struct ata_device *dev;
> + long int input;
> + unsigned long flags;
> + int rc;
> +
> + rc = kstrtol(buf, 10, &input);
> + if (rc)
> + return rc;
> + if ((input < 0) || (input > 1))
> + return -EINVAL;
> +
> + ap = ata_shost_to_port(sdev->host);
> +
> + spin_lock_irqsave(ap->lock, flags);
> + dev = ata_scsi_find_dev(ap, sdev);
> + if (unlikely(!dev)) {
> + rc = -ENODEV;
> + goto unlock;
> + }
> +
> + if (input)
> + dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
> + else
> + dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
> +
> +unlock:
> + spin_unlock_irqrestore(ap->lock, flags);
> +
> + return rc ? rc : len;
> +}
> +
> +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> + ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
> +EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
> +
> void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
> u8 sk, u8 asc, u8 ascq)
> {
> @@ -402,6 +469,7 @@ EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
>
> struct device_attribute *ata_common_sdev_attrs[] = {
> &dev_attr_unload_heads,
> + &dev_attr_ncq_prio_enable,
> NULL
> };
> EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index 90b69a6..c170be5 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -167,6 +167,7 @@ enum {
> ATA_DFLAG_UNLOCK_HPA = (1 << 18), /* unlock HPA */
> ATA_DFLAG_NCQ_SEND_RECV = (1 << 19), /* device supports NCQ SEND and
> RECV */
> ATA_DFLAG_NCQ_PRIO = (1 << 20), /* device supports NCQ priority */
> + ATA_DFLAG_NCQ_PRIO_ENABLE = (1 << 21), /* Priority cmds sent to dev */
> ATA_DFLAG_INIT_MASK = (1 << 24) - 1,
>
> ATA_DFLAG_DETACH = (1 << 24),
> @@ -545,6 +546,7 @@ typedef void (*ata_postreset_fn_t)(struct ata_link *link,
> unsigned int *classes)
>
> extern struct device_attribute dev_attr_link_power_management_policy;
> extern struct device_attribute dev_attr_unload_heads;
> +extern struct device_attribute dev_attr_ncq_prio_enable;
> extern struct device_attribute dev_attr_em_message_type;
> extern struct device_attribute dev_attr_em_message;
> extern struct device_attribute dev_attr_sw_activity;
> --
> 2.7.4
>
