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

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

4 files changed, 8 insertions, 0 deletions

diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index c355736..796dc33 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -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);
 }
 
diff --git a/sys/dev/ata/ata-all.c b/sys/dev/ata/ata-all.c
index 9ea25c0..3caad01 100644
--- a/sys/dev/ata/ata-all.c
+++ b/sys/dev/ata/ata-all.c
@@ -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
 }
diff --git a/sys/dev/mvs/mvs.c b/sys/dev/mvs/mvs.c
index e128616..debe55a 100644
--- a/sys/dev/mvs/mvs.c
+++ b/sys/dev/mvs/mvs.c
@@ -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);
 }
 
diff --git a/sys/dev/siis/siis.c b/sys/dev/siis/siis.c
index 17c1a39..2b709cd 100644
--- a/sys/dev/siis/siis.c
+++ b/sys/dev/siis/siis.c
@@ -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);
 }