xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SCSI] hpsa: add support for 'fastpath' i/o

Browse Source 
For certain i/o's to certain devices (unmasked physical disks) we
can bypass the RAID stack firmware and do the i/o to the device
directly and it will be faster.

Signed-off-by: Matt Gates <matthew.gates@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Matt Gates
2014-02-18 13:55:17 -06:00
committed by James Bottomley
parent e1d9cbfa09
commit e1f7de0cdd
3 changed files with 388 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/scsi/hpsa.h
View File

@@ -46,6 +46,7 @@ struct hpsa_scsi_dev_t {
unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
unsigned char model[16]; /* bytes 16-31 of inquiry data */
unsigned char raid_level; /* from inquiry page 0xC1 */
u32 ioaccel_handle;
};
struct reply_pool {
@@ -95,6 +96,8 @@ struct ctlr_info {
/* pointers to command and error info pool */
struct CommandList *cmd_pool;
dma_addr_t cmd_pool_dhandle;
struct io_accel1_cmd *ioaccel_cmd_pool;
dma_addr_t ioaccel_cmd_pool_dhandle;
struct ErrorInfo *errinfo_pool;
dma_addr_t errinfo_pool_dhandle;
unsigned long *cmd_pool_bits;
@@ -128,6 +131,7 @@ struct ctlr_info {
u8 nreply_queues;
dma_addr_t reply_pool_dhandle;
u32 *blockFetchTable;
u32 *ioaccel1_blockFetchTable;
unsigned char *hba_inquiry_data;
u64 last_intr_timestamp;
u32 last_heartbeat;
@@ -387,6 +391,45 @@ static bool SA5_performant_intr_pending(struct ctlr_info *h)
return register_value & SA5_OUTDB_STATUS_PERF_BIT;
}
#define SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT 0x100
static bool SA5_ioaccel_mode1_intr_pending(struct ctlr_info *h)
{
unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);
return (register_value & SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT) ?
true : false;
}
#define IOACCEL_MODE1_REPLY_QUEUE_INDEX 0x1A0
#define IOACCEL_MODE1_PRODUCER_INDEX 0x1B8
#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)
{
u64 register_value;
struct reply_pool *rq = &h->reply_queue[q];
unsigned long flags;
BUG_ON(q >= h->nreply_queues);
register_value = rq->head[rq->current_entry];
if (register_value != IOACCEL_MODE1_REPLY_UNUSED) {
rq->head[rq->current_entry] = IOACCEL_MODE1_REPLY_UNUSED;
if (++rq->current_entry == rq->size)
rq->current_entry = 0;
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;
}
static struct access_method SA5_access = {
SA5_submit_command,
SA5_intr_mask,
@@ -395,6 +438,14 @@ static struct access_method SA5_access = {
SA5_completed,
};
static struct access_method SA5_ioaccel_mode1_access = {
SA5_submit_command,
SA5_performant_intr_mask,
SA5_fifo_full,
SA5_ioaccel_mode1_intr_pending,
SA5_ioaccel_mode1_completed,
};
static struct access_method SA5_performant_access = {
SA5_submit_command,
SA5_performant_intr_mask,