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Message-ID: <Z-woE4LfU4qlFmez@google.com>
Date: Tue, 1 Apr 2025 10:53:23 -0700
From: Igor Pylypiv <ipylypiv@...gle.com>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: Niklas Cassel <cassel@...nel.org>, linux-ide@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: libata-scsi: Set INFORMATION sense data field
consistently
On Tue, Apr 01, 2025 at 04:33:55PM +0900, Damien Le Moal wrote:
> On 3/29/25 03:30, Igor Pylypiv wrote:
> > Populate the INFORMATION field with ATA LBA when sense data is obtained
> > by the ata_eh_request_sense(). Kernel already populates the INFORMATION
>
> s/by the/with
> s/Kernel/The kernel or s/Kernel/libata-eh
>
> > field when sense data is reported via autosense or when it is generated
> > by the ata_gen_ata_sense().
> >
> > ATA PASS-THROUGH commands, unlike regular ATA commands, populate
> > the INFORMATION field with ATA ERROR, STATUS, DEVICE, and COUNT(7:0)
> > fields thus setting ATA LBA into the INFORMATION field is incorrect.
>
> Could you rephrase all of this is a manner that is clearer ? That is, describe
> the problem first and then how you fix it. As-is, this is hard to understand.
Thanks, Damien. I'll rephrase it in v2.
>
> > diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> > index 2796c0da8257..7e93581439b2 100644
> > --- a/drivers/ata/libata-scsi.c
> > +++ b/drivers/ata/libata-scsi.c
> > @@ -216,17 +216,30 @@ void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
> > scsi_build_sense(cmd, d_sense, sk, asc, ascq);
> > }
> >
> > -void ata_scsi_set_sense_information(struct ata_device *dev,
> > - struct scsi_cmnd *cmd,
> > - const struct ata_taskfile *tf)
> > +/**
> > + * ata_scsi_set_sense_information - Populate INFORMATION field
> > + * @qc: ATA command
> > + *
> > + * Populates the INFORMATION field with ATA LBA.
> > + *
> > + * LOCKING:
> > + * None.
> > + */
>
> The function name is clear enough. We do not need this kdoc block to clarify it
> and this is a static function anyway.
>
> > +static void ata_scsi_set_sense_information(struct ata_queued_cmd *qc)
> > {
> > u64 information;
> >
> > - information = ata_tf_read_block(tf, dev);
> > + if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
> > + ata_dev_dbg(qc->dev,
> > + "missing result TF: can't set INFORMATION sense field\n");
>
> Why ata_dev_dbg() ? This should be ata_dev_err(), no ? With your change, this is
> not supposed to be called without the rtf filled...
I used ata_dev_dbg() to match ata_scsi_set_passthru_sense_fields(),
ata_gen_passthru_sense(), and ata_gen_ata_sense().
Last year we settled on using the ata_dev_dbg() to avoid a potential log spam:
https://lore.kernel.org/lkml/ab9f6564-3df1-4061-93e7-32a59aacb205@kernel.org/
Thanks,
Igor
> > + return;
> > + }
> > +
> > + information = ata_tf_read_block(&qc->result_tf, qc->dev);
> > if (information == U64_MAX)
> > return;
> >
> > - scsi_set_sense_information(cmd->sense_buffer,
> > + scsi_set_sense_information(qc->scsicmd->sense_buffer,
> > SCSI_SENSE_BUFFERSIZE, information);
> > }
> >
> > @@ -971,8 +984,7 @@ static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
> > * ata_gen_ata_sense - generate a SCSI fixed sense block
> > * @qc: Command that we are erroring out
> > *
> > - * Generate sense block for a failed ATA command @qc. Descriptor
> > - * format is used to accommodate LBA48 block address.
> > + * Generate sense block for a failed ATA command @qc.
> > *
> > * LOCKING:
> > * None.
> > @@ -982,8 +994,6 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
> > struct ata_device *dev = qc->dev;
> > struct scsi_cmnd *cmd = qc->scsicmd;
> > struct ata_taskfile *tf = &qc->result_tf;
> > - unsigned char *sb = cmd->sense_buffer;
> > - u64 block;
> > u8 sense_key, asc, ascq;
> >
> > if (ata_dev_disabled(dev)) {
> > @@ -1014,12 +1024,6 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
> > ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0);
> > return;
> > }
> > -
> > - block = ata_tf_read_block(&qc->result_tf, dev);
> > - if (block == U64_MAX)
> > - return;
> > -
> > - scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
> > }
> >
> > void ata_scsi_sdev_config(struct scsi_device *sdev)
> > @@ -1679,8 +1683,10 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
> > ata_scsi_set_passthru_sense_fields(qc);
> > if (is_ck_cond_request)
> > set_status_byte(qc->scsicmd, SAM_STAT_CHECK_CONDITION);
> > - } else if (is_error && !have_sense) {
> > - ata_gen_ata_sense(qc);
> > + } else if (is_error) {
> > + if (!have_sense)
> > + ata_gen_ata_sense(qc);
> > + ata_scsi_set_sense_information(qc);
> > }
> >
> > ata_qc_done(qc);
> > diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
> > index 0337be4faec7..ce5c628fa6fd 100644
> > --- a/drivers/ata/libata.h
> > +++ b/drivers/ata/libata.h
> > @@ -141,9 +141,6 @@ extern int ata_scsi_offline_dev(struct ata_device *dev);
> > extern bool ata_scsi_sense_is_valid(u8 sk, u8 asc, u8 ascq);
> > extern void ata_scsi_set_sense(struct ata_device *dev,
> > struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq);
> > -extern void ata_scsi_set_sense_information(struct ata_device *dev,
> > - struct scsi_cmnd *cmd,
> > - const struct ata_taskfile *tf);
> > extern void ata_scsi_media_change_notify(struct ata_device *dev);
> > extern void ata_scsi_hotplug(struct work_struct *work);
> > extern void ata_scsi_dev_rescan(struct work_struct *work);
>
>
> --
> Damien Le Moal
> Western Digital Research
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