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

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Date: Mon, 4 Mar 2024 16:54:58 -0800
From: Igor Pylypiv <ipylypiv@...gle.com>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: 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>,
	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 Tue, Mar 05, 2024 at 08:37:53AM +0900, Damien Le Moal wrote:
> 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.

Updated in v5. Thank you, Damien!

> 
> With that, looks good to me.
> 
> Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
> 
> -- 
> Damien Le Moal
> Western Digital Research
>