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Message-ID: <e58e0273-c0f0-4249-b4d0-d16d274311a1@suse.de>
Date: Wed, 6 Mar 2024 08:14:04 +0100
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Subject: Re: [PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes
 for SATA devices
Content-Language: en-US
To: Igor Pylypiv <ipylypiv@google.com>, Damien Le Moal <dlemoal@kernel.org>,
 Niklas Cassel <cassel@kernel.org>, John Garry <john.g.garry@oracle.com>,
 Jason Yan <yanaijie@huawei.com>, "James E.J. Bottomley"
 <jejb@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>,
 Jack Wang <jinpu.wang@cloud.ionos.com>,
 Xiang Chen <chenxiang66@hisilicon.com>,
 Artur Paszkiewicz <artur.paszkiewicz@intel.com>,
 Bart Van Assche <bvanassche@acm.org>
Cc: TJ Adams <tadamsjr@google.com>, linux-ide@vger.kernel.org,
 linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240305235823.3308225-1-ipylypiv@google.com>
 <20240305235823.3308225-3-ipylypiv@google.com>
From: Hannes Reinecke <hare@suse.de>
In-Reply-To: <20240305235823.3308225-3-ipylypiv@google.com>
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On 3/6/24 00:58, Igor Pylypiv wrote:
> Libata sysfs attributes cannot be used for libsas managed SATA devices
> because the ata_port location is different for libsas.
> 
> Defined sysfs attributes (visible for SATA devices only):
> - /sys/block/sda/device/ncq_prio_enable
> - /sys/block/sda/device/ncq_prio_supported
> 
> The newly defined attributes will pass the correct ata_port to libata
> helper functions.
> 
> Reviewed-by: John Garry <john.g.garry@oracle.com>
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> Reviewed-by: Jason Yan <yanaijie@huawei.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> ---
>   drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++
>   include/scsi/sas_ata.h        |  6 +++
>   2 files changed, 100 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> index 12e2653846e3..04b0bd9a4e01 100644
> --- a/drivers/scsi/libsas/sas_ata.c
> +++ b/drivers/scsi/libsas/sas_ata.c
> @@ -964,3 +964,97 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
>   			       force_phy_id, &tmf_task);
>   }
>   EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
> +
> +static ssize_t sas_ncq_prio_supported_show(struct device *device,
> +					   struct device_attribute *attr,
> +					   char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool supported;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +
You don't need the WARN_ON here; the 'is_visible' function will take
care of it.

> +	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", supported);
> +}
> +
> +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
> +
> +static ssize_t sas_ncq_prio_enable_show(struct device *device,
> +					struct device_attribute *attr,
> +					char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enabled;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +

Same here.

> +	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", enabled);
> +}
> +
> +static ssize_t sas_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 domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enable;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +

And here.

> +	rc = kstrtobool(buf, &enable);
> +	if (rc)
> +		return rc;
> +
> +	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
> +	if (rc)
> +		return rc;
> +
> +	return len;
> +}
> +
> +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> +	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
> +
> +static struct attribute *sas_ata_sdev_attrs[] = {
> +	&dev_attr_ncq_prio_supported.attr,
> +	&dev_attr_ncq_prio_enable.attr,
> +	NULL
> +};
> +
> +static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
> +				       struct attribute *attr, int i)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +
> +	if (!dev_is_sata(ddev))
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +const struct attribute_group sas_ata_sdev_attr_group = {
> +	.attrs = sas_ata_sdev_attrs,
> +	.is_visible = sas_ata_attr_is_visible,
> +};
> +EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
> diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
> index 2f8c719840a6..59a75cd8b5e0 100644
> --- a/include/scsi/sas_ata.h
> +++ b/include/scsi/sas_ata.h
> @@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
>   int sas_discover_sata(struct domain_device *dev);
>   int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
>   		    struct domain_device *child, int phy_id);
> +
> +extern const struct attribute_group sas_ata_sdev_attr_group;
>   #else
>   
>   static inline void sas_ata_disabled_notice(void)
> @@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
>   	sas_ata_disabled_notice();
>   	return -ENODEV;
>   }
> +
> +static const struct attribute_group sas_ata_sdev_attr_group __maybe_unused = {
> +	.attrs = NULL,
> +};
>   #endif
>   
>   #endif /* _SAS_ATA_H_ */

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
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