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libata: Fix retrieving of active qcs 

ata_qc_complete_multiple() is called with a mask of the still active
tags.

mv_sata doesn't have this information directly and instead calculates
the still active tags from the started tags (ap->qc_active) and the
finished tags as (ap->qc_active ^ done_mask)

Since 28361c4036 the hw_tag and tag are no longer the same and the
equation is no longer valid. In ata_exec_internal_sg() ap->qc_active is
initialized as 1ULL << ATA_TAG_INTERNAL, but in hardware tag 0 is
started and this will be in done_mask on completion. ap->qc_active ^
done_mask becomes 0x100000000 ^ 0x1 = 0x100000001 and thus tag 0 used as
the internal tag will never be reported as completed.

This is fixed by introducing ata_qc_get_active() which returns the
active hardware tags and calling it where appropriate.

This is tested on mv_sata, but sata_fsl and sata_nv suffer from the same
problem. There is another case in sata_nv that most likely needs fixing
as well, but this looks a little different, so I wasn't confident enough
to change that.

Fixes: 28361c4036 ("libata: add extra internal command")
Cc: stable@vger.kernel.org
Tested-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add missing export of ata_qc_get_active(), as per Pali.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sascha Hauer 2019-12-13 09:04:08 +01:00 committed by Jens Axboe
parent 46cf053efe
commit 8385d756e1
5 changed files with 28 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/ata/libata-core.c
View File

@ -5328,6 +5328,30 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
}
}
/**
* ata_qc_get_active - get bitmask of active qcs
* @ap: port in question
*
* LOCKING:
* spin_lock_irqsave(host lock)
*
* RETURNS:
* Bitmask of active qcs
*/
u64 ata_qc_get_active(struct ata_port *ap)
{
u64 qc_active = ap->qc_active;
/* ATA_TAG_INTERNAL is sent to hw as tag 0 */
if (qc_active & (1ULL << ATA_TAG_INTERNAL)) {
qc_active |= (1 << 0);
qc_active &= ~(1ULL << ATA_TAG_INTERNAL);
}
return qc_active;
}
EXPORT_SYMBOL_GPL(ata_qc_get_active);
/**
* ata_qc_complete_multiple - Complete multiple qcs successfully
* @ap: port in question

2
drivers/ata/sata_fsl.c
View File

@ -1280,7 +1280,7 @@ static void sata_fsl_host_intr(struct ata_port *ap)
i, ioread32(hcr_base + CC),
ioread32(hcr_base + CA));
}
ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask);
ata_qc_complete_multiple(ap, ata_qc_get_active(ap) ^ done_mask);
return;
} else if ((ap->qc_active & (1ULL << ATA_TAG_INTERNAL))) {

2
drivers/ata/sata_mv.c
View File

@ -2829,7 +2829,7 @@ static void mv_process_crpb_entries(struct ata_port *ap, struct mv_port_priv *pp
}
if (work_done) {
ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask);
ata_qc_complete_multiple(ap, ata_qc_get_active(ap) ^ done_mask);
/* Update the software queue position index in hardware */
writelfl((pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK) |

2
drivers/ata/sata_nv.c
View File

@ -984,7 +984,7 @@ static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
check_commands = 0;
check_commands &= ~(1 << pos);
}
ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask);
ata_qc_complete_multiple(ap, ata_qc_get_active(ap) ^ done_mask);
}
}

1
include/linux/libata.h
View File

@ -1175,6 +1175,7 @@ extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
struct ata_taskfile *tf, u16 *id);
extern void ata_qc_complete(struct ata_queued_cmd *qc);
extern int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active);
extern u64 ata_qc_get_active(struct ata_port *ap);
extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);
extern int ata_std_bios_param(struct scsi_device *sdev,
struct block_device *bdev,