[PATCH 2 12/24] hpsa: avoid unnecessary readl on every command submission

[Stephen M. Cameron]

From: Stephen M. Cameron <scame...@beardog.cce.hp.com>

for controllers which support either of the ioaccel transport methods.

Signed-off-by: Stephen M. Cameron <scame...@beardog.cce.hp.com>
Reviewed-by: Mike Miller <michael.mil...@canonical.com>
Reviewed-by: Joe Handzik <joseph.t.hand...@hp.com>
---
 drivers/scsi/hpsa.c |    7 +++++++
 drivers/scsi/hpsa.h |   15 ++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index acb88e5..ad73017 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -7323,6 +7323,13 @@ 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);
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 8e8310e..1855469 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -345,6 +345,12 @@ 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)
 {
@@ -352,7 +358,6 @@ 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);
 }
 
 /*
@@ -563,6 +568,14 @@ 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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