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libata: add extra internal command

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Bump the internal tag to 32, instead of stealing the last tag in
our regular command space. This works just fine, since we don't
actually need a separate hardware tag for this. Internal commands
cannot coexist with NCQ commands.

As a bonus, we get rid of the special casing of what tag to use
for the internal command.

This is in preparation for utilizing all 32 commands for normal IO.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Jens Axboe 2018-05-11 12:51:09 -06:00 committed by Tejun Heo
parent ba80c3a572
commit 28361c4036
3 changed files with 16 additions and 26 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/ata/libata-core.c
View file

@ -1570,7 +1570,7 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
u8 command = tf->command;
int auto_timeout = 0;
struct ata_queued_cmd *qc;
unsigned int tag, preempted_tag;
unsigned int preempted_tag;
u32 preempted_sactive;
u64 preempted_qc_active;
int preempted_nr_active_links;
@ -1588,20 +1588,10 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
}
/* initialize internal qc */
qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
/* XXX: Tag 0 is used for drivers with legacy EH as some
* drivers choke if any other tag is given. This breaks
* ata_tag_internal() test for those drivers. Don't use new
* EH stuff without converting to it.
*/
if (ap->ops->error_handler)
tag = ATA_TAG_INTERNAL;
else
tag = 0;
qc = __ata_qc_from_tag(ap, tag);
qc->tag = qc->hw_tag = tag;
qc->tag = ATA_TAG_INTERNAL;
qc->hw_tag = 0;
qc->scsicmd = NULL;
qc->ap = ap;
qc->dev = dev;
@ -5156,7 +5146,7 @@ void ata_qc_free(struct ata_queued_cmd *qc)
qc->flags = 0;
tag = qc->tag;
if (likely(ata_tag_valid(tag))) {
if (ata_tag_valid(tag)) {
qc->tag = ATA_TAG_POISON;
if (ap->flags & ATA_FLAG_SAS_HOST)
ata_sas_free_tag(tag, ap);
@ -5415,7 +5405,7 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
WARN_ON_ONCE(link->sactive);
ap->nr_active_links++;
link->active_tag = qc->hw_tag;
link->active_tag = qc->tag;
}
qc->flags |= ATA_QCFLAG_ACTIVE;

3
drivers/ata/libata-eh.c
View file

@ -1057,7 +1057,8 @@ static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
/* we're gonna abort all commands, no need for fast drain */
ata_eh_set_pending(ap, 0);
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
/* include internal tag in iteration */
for (tag = 0; tag <= ATA_MAX_QUEUE; tag++) {
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
if (qc && (!link || qc->dev->link == link)) {

17
include/linux/libata.h
View file

@ -125,9 +125,8 @@ enum {
LIBATA_MAX_PRD = ATA_MAX_PRD / 2,
LIBATA_DUMB_MAX_PRD = ATA_MAX_PRD / 4, /* Worst case */
ATA_DEF_QUEUE = 1,
/* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
ATA_MAX_QUEUE = 32,
ATA_TAG_INTERNAL = ATA_MAX_QUEUE - 1,
ATA_TAG_INTERNAL = ATA_MAX_QUEUE,
ATA_SHORT_PAUSE = 16,
ATAPI_MAX_DRAIN = 16 << 10,
@ -850,7 +849,7 @@ struct ata_port {
unsigned int udma_mask;
unsigned int cbl; /* cable type; ATA_CBL_xxx */
struct ata_queued_cmd qcmd[ATA_MAX_QUEUE];
struct ata_queued_cmd qcmd[ATA_MAX_QUEUE + 1];
unsigned long sas_tag_allocated; /* for sas tag allocation only */
u64 qc_active;
int nr_active_links; /* #links with active qcs */
@ -1486,16 +1485,16 @@ extern void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
const char *name);
#endif
static inline unsigned int ata_tag_valid(unsigned int tag)
{
return (tag < ATA_MAX_QUEUE) ? 1 : 0;
}
static inline bool ata_tag_internal(unsigned int tag)
{
return tag == ATA_TAG_INTERNAL;
}
static inline bool ata_tag_valid(unsigned int tag)
{
return tag < ATA_MAX_QUEUE || ata_tag_internal(tag);
}
/*
* device helpers
*/
@ -1656,7 +1655,7 @@ static inline void ata_qc_set_polling(struct ata_queued_cmd *qc)
static inline struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
unsigned int tag)
{
if (likely(ata_tag_valid(tag)))
if (ata_tag_valid(tag))
return &ap->qcmd[tag];
return NULL;
}