linux-kernel - Re: [PATCH v4 3/8] ata: libata-scsi: Honour the D_SENSE bit for CK

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Message-ID: <ZoMbviAryO5WdaJZ@ryzen.lan>
Date: Mon, 1 Jul 2024 23:12:30 +0200
From: Niklas Cassel <cassel@...nel.org>
To: Igor Pylypiv <ipylypiv@...gle.com>
Cc: Damien Le Moal <dlemoal@...nel.org>, Tejun Heo <tj@...nel.org>,
	Hannes Reinecke <hare@...e.de>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v4 3/8] ata: libata-scsi: Honour the D_SENSE bit for
 CK_COND=1 and no error

On Mon, Jul 01, 2024 at 07:57:53PM +0000, Igor Pylypiv wrote:
> SAT-5 revision 8 specification removed the text about the ANSI INCITS
> 431-2007 compliance which was requiring SCSI/ATA Translation (SAT) to
> return descriptor format sense data for the ATA PASS-THROUGH commands
> regardless of the setting of the D_SENSE bit.
> 
> Let's honour the D_SENSE bit for CK_COND=1 commands that had no error.
> Kernel already honours the D_SENSE bit when creating the sense buffer
> for commands that had an error.

Nit: we also honor it when creating the sense buffer for successful NCQ
commands (e.g. CDL policy 0xD).


> 
> SAT-5 revision 7
> ================
> 
> 12.2.2.8 Fixed format sense data
> 
> Table 212 shows the fields returned in the fixed format sense data
> (see SPC-5) for ATA PASS-THROUGH commands. SATLs compliant with ANSI
> INCITS 431-2007, SCSI/ATA Translation (SAT) return descriptor format
> sense data for the ATA PASS-THROUGH commands regardless of the setting
> of the D_SENSE bit.
> 
> SAT-5 revision 8
> ================
> 
> 12.2.2.8 Fixed format sense data
> 
> Table 211 shows the fields returned in the fixed format sense data
> (see SPC-5) for ATA PASS-THROUGH commands.
> 
> Cc: stable@...r.kernel.org # 4.19+
> Reported-by: Niklas Cassel <cassel@...nel.org>
> Closes: https://lore.kernel.org/linux-ide/Zn1WUhmLglM4iais@ryzen.lan
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
> ---
>  drivers/ata/libata-scsi.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 26b1263f5c7c..ace6b009e7ff 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -941,11 +941,8 @@ static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
>  				   &sense_key, &asc, &ascq);
>  		ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
>  	} else {
> -		/*
> -		 * ATA PASS-THROUGH INFORMATION AVAILABLE
> -		 * Always in descriptor format sense.
> -		 */
> -		scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D);
> +		/* ATA PASS-THROUGH INFORMATION AVAILABLE */
> +		ata_scsi_set_sense(qc->dev, cmd, RECOVERED_ERROR, 0, 0x1D);
>  	}
>  }
>  
> -- 
> 2.45.2.803.g4e1b14247a-goog
> 

With or without nit fixed:
Reviewed-by: Niklas Cassel <cassel@...nel.org>