diff options
| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-02-04 20:54:57 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-04-30 00:00:27 +0200 |
| commit | 2446a79f4f0a5e88e5d8316dac407d66ac10f70d (patch) | |
| tree | 9adb9c7816ef80c39b33d141efefc35803f17717 /drivers | |
| parent | 0555659d63c285ceb7ead3115532e1b71b0f27a7 (diff) | |
ieee1394: sbp2: optimize DMA direction of s/g tables
Unlike the name suggests, "cmd->scatter_gather_element" holds only the
s/g table, not the actual s/g elements. Since the table is only read
but never written by the device, DMA_BIDIRECTIONAL can be replaced by
DMA_TO_DEVICE which may be cheaper on some architectures.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ieee1394/sbp2.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c index e15b5d7b9a0..cae3816e68d 100644 --- a/drivers/ieee1394/sbp2.c +++ b/drivers/ieee1394/sbp2.c @@ -489,7 +489,7 @@ static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu) cmd->sge_dma = dma_map_single(hi->host->device.parent, &cmd->scatter_gather_element, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); INIT_LIST_HEAD(&cmd->list); list_add_tail(&cmd->list, &lu->cmd_orb_completed); } @@ -514,7 +514,7 @@ static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu) DMA_TO_DEVICE); dma_unmap_single(host->device.parent, cmd->sge_dma, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); kfree(cmd); } spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); @@ -1633,7 +1633,7 @@ static void sbp2_link_orb_command(struct sbp2_lu *lu, DMA_TO_DEVICE); dma_sync_single_for_device(hi->host->device.parent, cmd->sge_dma, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); /* check to see if there are any previous orbs to use */ spin_lock_irqsave(&lu->cmd_orb_lock, flags); @@ -1799,7 +1799,7 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, DMA_TO_DEVICE); dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); /* Grab SCSI command pointers and check status. */ /* * FIXME: If the src field in the status is 1, the ORB DMA must @@ -1931,7 +1931,7 @@ static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status) DMA_TO_DEVICE); dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); sbp2util_mark_command_completed(lu, cmd); if (cmd->Current_SCpnt) { cmd->Current_SCpnt->result = status << 16; @@ -2062,7 +2062,7 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt) dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, sizeof(cmd->scatter_gather_element), - DMA_BIDIRECTIONAL); + DMA_TO_DEVICE); sbp2util_mark_command_completed(lu, cmd); if (cmd->Current_SCpnt) { cmd->Current_SCpnt->result = DID_ABORT << 16; |