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[SCSI] hpsa: add ioaccell mode 1 RAID offload support.

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This enables sending i/o's destined for RAID logical drives
which can be serviced by a single physical disk down a different,
faster i/o path directly to physical drives for certain logical
volumes on SSDs bypassing the Smart Array RAID stack for a
performance improvement.

Signed-off-by: Matt Gates <matthew.gates@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Scott Teel <scott.teel@hp.com>
Signed-off-by: Mike Miller <michael.miller@canonical.com>
Signed-off-by: Don Brace <brace@beardog.cce.hp.com>
Signed-off-by: Joe Handzik <joseph.t.handzik@hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron
2014-02-18 13:55:33 -06:00
committed by James Bottomley
parent 17eb87d216
commit 283b4a9b98
3 changed files with 607 additions and 49 deletions
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26
drivers/scsi/hpsa.h
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@@ -47,6 +47,13 @@ struct hpsa_scsi_dev_t {
unsigned char model[16]; /* bytes 16-31 of inquiry data */
unsigned char raid_level; /* from inquiry page 0xC1 */
u32 ioaccel_handle;
int offload_config; /* I/O accel RAID offload configured */
int offload_enabled; /* I/O accel RAID offload enabled */
int offload_to_mirror; /* Send next I/O accelerator RAID
* offload request to mirror drive
*/
struct raid_map_data raid_map; /* I/O accelerator RAID map */
};
struct reply_pool {
@@ -133,6 +140,10 @@ struct ctlr_info {
u32 *blockFetchTable;
u32 *ioaccel1_blockFetchTable;
unsigned char *hba_inquiry_data;
u32 driver_support;
u32 fw_support;
int ioaccel_support;
int ioaccel_maxsg;
u64 last_intr_timestamp;
u32 last_heartbeat;
u64 last_heartbeat_timestamp;
@@ -406,8 +417,7 @@ static bool SA5_ioaccel_mode1_intr_pending(struct ctlr_info *h)
#define IOACCEL_MODE1_CONSUMER_INDEX 0x1BC
#define IOACCEL_MODE1_REPLY_UNUSED 0xFFFFFFFFFFFFFFFFULL
static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h,
u8 q)
static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h, u8 q)
{
u64 register_value;
struct reply_pool *rq = &h->reply_queue[q];
@@ -420,12 +430,18 @@ static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h,
rq->head[rq->current_entry] = IOACCEL_MODE1_REPLY_UNUSED;
if (++rq->current_entry == rq->size)
rq->current_entry = 0;
/*
* @todo
*
* Don't really need to write the new index after each command,
* but with current driver design this is easiest.
*/
wmb();
writel((q << 24) | rq->current_entry, h->vaddr +
IOACCEL_MODE1_CONSUMER_INDEX);
spin_lock_irqsave(&h->lock, flags);
h->commands_outstanding--;
spin_unlock_irqrestore(&h->lock, flags);
} else {
writel((q << 24) | rq->current_entry,
h->vaddr + IOACCEL_MODE1_CONSUMER_INDEX);
}
return (unsigned long) register_value;
}