提交 b3a52e79 编写于 作者: S Stephen M. Cameron 提交者: Christoph Hellwig

hpsa: avoid unnecessary readl on every command submission

for controllers which support either of the ioaccel transport methods.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Reviewed-by: NMike Miller <michael.miller@canonical.com>
Reviewed-by: NJoe Handzik <joseph.t.handzik@hp.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 094963da
......@@ -7330,6 +7330,13 @@ static void hpsa_enter_performant_mode(struct ctlr_info *h, u32 trans_support)
* 10 = 6 s/g entry or 24k
*/
/* If the controller supports either ioaccel method then
* we can also use the RAID stack submit path that does not
* perform the superfluous readl() after each command submission.
*/
if (trans_support & (CFGTBL_Trans_io_accel1 | CFGTBL_Trans_io_accel2))
access = SA5_performant_access_no_read;
/* Controller spec: zero out this buffer. */
for (i = 0; i < h->nreply_queues; i++)
memset(h->reply_queue[i].head, 0, h->reply_queue_size);
......
......@@ -346,6 +346,12 @@ static void SA5_submit_command(struct ctlr_info *h,
(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
}
static void SA5_submit_command_no_read(struct ctlr_info *h,
struct CommandList *c)
{
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
}
static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
struct CommandList *c)
{
......@@ -353,7 +359,6 @@ static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
writel(c->busaddr, h->vaddr + IOACCEL2_INBOUND_POSTQ_32);
else
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
}
/*
......@@ -564,6 +569,14 @@ static struct access_method SA5_performant_access = {
SA5_performant_completed,
};
static struct access_method SA5_performant_access_no_read = {
SA5_submit_command_no_read,
SA5_performant_intr_mask,
SA5_fifo_full,
SA5_performant_intr_pending,
SA5_performant_completed,
};
struct board_type {
u32 board_id;
char *product_name;
......
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