linux-kernel - Re: [PATCH v4 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices

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Date: Tue, 5 Mar 2024 08:37:53 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Igor Pylypiv <ipylypiv@...gle.com>, Niklas Cassel <cassel@...nel.org>,
 John Garry <john.g.garry@...cle.com>, Jason Yan <yanaijie@...wei.com>,
 "James E.J. Bottomley" <jejb@...ux.ibm.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Jack Wang <jinpu.wang@...ud.ionos.com>, Hannes Reinecke <hare@...e.de>,
 Xiang Chen <chenxiang66@...ilicon.com>,
 Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
 Bart Van Assche <bvanassche@....org>
Cc: TJ Adams <tadamsjr@...gle.com>, linux-ide@...r.kernel.org,
 linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/7] scsi: libsas: Define NCQ Priority sysfs attributes
 for SATA devices

On 3/5/24 07:08, 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@...cle.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.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..4ecdfa2a12c3 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(!dev_is_sata(ddev)))

WARN_ON_ONCE() please. Same comment for all the occurences of this check.

With that, looks good to me.

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>

-- 
Damien Le Moal
Western Digital Research