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Add two functions xpt_batch_start() and xpt_batch_done() to the CAM SIM KPI

Browse Source 
to allow drivers to handle request completion directly without passing
them to the CAM SWI thread removing extra context switch.
Modify all ATA/SATA drivers to use them.

Reviewed by:	gibbs, ken
MFC after:	2 weeks
This commit is contained in:
Alexander Motin 2012-05-12 13:55:36 +00:00
parent 7af1242a34
commit 711f661393
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=235333
7 changed files with 32 additions and 1 deletions
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1
sys/cam/cam_sim.h
View File

@ -106,6 +106,7 @@ struct cam_sim {
#define CAM_SIM_MPSAFE 0x02
#define CAM_SIM_ON_DONEQ 0x04
#define CAM_SIM_POLLED 0x08
#define CAM_SIM_BATCH 0x10
struct callout callout;
struct cam_devq *devq; /* Device Queue to use for this SIM */
int refcount; /* References to the SIM. */

22
sys/cam/cam_xpt.c
View File

@ -4332,7 +4332,8 @@ xpt_done(union ccb *done_ccb)
TAILQ_INSERT_TAIL(&sim->sim_doneq, &done_ccb->ccb_h,
sim_links.tqe);
done_ccb->ccb_h.pinfo.index = CAM_DONEQ_INDEX;
if ((sim->flags & (CAM_SIM_ON_DONEQ | CAM_SIM_POLLED)) == 0) {
if ((sim->flags & (CAM_SIM_ON_DONEQ | CAM_SIM_POLLED |
CAM_SIM_BATCH)) == 0) {
mtx_lock(&cam_simq_lock);
first = TAILQ_EMPTY(&cam_simq);
TAILQ_INSERT_TAIL(&cam_simq, sim, links);
@ -4344,6 +4345,25 @@ xpt_done(union ccb *done_ccb)
}
}
void
xpt_batch_start(struct cam_sim *sim)
{
KASSERT((sim->flags & CAM_SIM_BATCH) == 0, ("Batch flag already set"));
sim->flags |= CAM_SIM_BATCH;
}
void
xpt_batch_done(struct cam_sim *sim)
{
KASSERT((sim->flags & CAM_SIM_BATCH) != 0, ("Batch flag was not set"));
sim->flags &= ~CAM_SIM_BATCH;
if (!TAILQ_EMPTY(&sim->sim_doneq) &&
(sim->flags & CAM_SIM_ON_DONEQ) == 0)
camisr_runqueue(&sim->sim_doneq);
}
union ccb *
xpt_alloc_ccb()
{

2
sys/cam/cam_xpt_sim.h
View File

@ -51,6 +51,8 @@ void xpt_release_devq_rl(struct cam_path *path, cam_rl rl,
u_int count, int run_queue);
int xpt_sim_opened(struct cam_sim *sim);
void xpt_done(union ccb *done_ccb);
void xpt_batch_start(struct cam_sim *sim);
void xpt_batch_done(struct cam_sim *sim);
#endif
#endif /* _CAM_CAM_XPT_SIM_H */

2
sys/dev/ahci/ahci.c
View File

@ -1457,7 +1457,9 @@ ahci_ch_intr_locked(void *data)
struct ahci_channel *ch = device_get_softc(dev);
mtx_lock(&ch->mtx);
xpt_batch_start(ch->sim);
ahci_ch_intr(data);
xpt_batch_done(ch->sim);
mtx_unlock(&ch->mtx);
}

2
sys/dev/ata/ata-all.c
View File

@ -544,9 +544,11 @@ ata_interrupt(void *data)
struct ata_channel *ch = (struct ata_channel *)data;
mtx_lock(&ch->state_mtx);
xpt_batch_start(ch->sim);
#endif
ata_interrupt_locked(data);
#ifdef ATA_CAM
xpt_batch_done(ch->sim);
mtx_unlock(&ch->state_mtx);
#endif
}

2
sys/dev/mvs/mvs.c
View File

@ -654,7 +654,9 @@ mvs_ch_intr_locked(void *data)
struct mvs_channel *ch = device_get_softc(dev);
mtx_lock(&ch->mtx);
xpt_batch_start(ch->sim);
mvs_ch_intr(data);
xpt_batch_done(ch->sim);
mtx_unlock(&ch->mtx);
}

2
sys/dev/siis/siis.c
View File

@ -830,7 +830,9 @@ siis_ch_intr_locked(void *data)
struct siis_channel *ch = device_get_softc(dev);
mtx_lock(&ch->mtx);
xpt_batch_start(ch->sim);
siis_ch_intr(data);
xpt_batch_done(ch->sim);
mtx_unlock(&ch->mtx);
}