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ieee1394: sbp2: optimize DMA direction of command ORBs
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Only the driver writes ORBs, the device just reads them.  Therefore
PCI_DMA_BIDIRECTIONAL can be replaced by PCI_DMA_TODEVICE which may be
cheaper on some architectures.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Stefan Richter committed Sep 17, 2006
1 parent 2821276 commit d4018d7
Showing 1 changed file with 8 additions and 8 deletions.
16 changes: 8 additions & 8 deletions drivers/ieee1394/sbp2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -492,7 +492,7 @@ static int sbp2util_create_command_orb_pool(struct scsi_id_instance_data *scsi_i
command->command_orb_dma =
pci_map_single(hi->host->pdev, &command->command_orb,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
SBP2_DMA_ALLOC("single command orb DMA");
command->sge_dma =
pci_map_single(hi->host->pdev,
Expand Down Expand Up @@ -525,7 +525,7 @@ static void sbp2util_remove_command_orb_pool(struct scsi_id_instance_data *scsi_
/* Release our generic DMA's */
pci_unmap_single(host->pdev, command->command_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
SBP2_DMA_FREE("single command orb DMA");
pci_unmap_single(host->pdev, command->sge_dma,
sizeof(command->scatter_gather_element),
Expand Down Expand Up @@ -1982,7 +1982,7 @@ static void sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,

pci_dma_sync_single_for_device(hi->host->pdev, command->command_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
pci_dma_sync_single_for_device(hi->host->pdev, command->sge_dma,
sizeof(command->scatter_gather_element),
PCI_DMA_BIDIRECTIONAL);
Expand Down Expand Up @@ -2012,14 +2012,14 @@ static void sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,
*/
pci_dma_sync_single_for_cpu(hi->host->pdev, last_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
last_orb->next_ORB_lo = cpu_to_be32(command->command_orb_dma);
wmb();
/* Tells hardware that this pointer is valid */
last_orb->next_ORB_hi = 0;
pci_dma_sync_single_for_device(hi->host->pdev, last_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
addr += SBP2_DOORBELL_OFFSET;
data[0] = 0;
length = 4;
Expand Down Expand Up @@ -2176,7 +2176,7 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int dest
SBP2_DEBUG("Found status for command ORB");
pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma,
sizeof(command->scatter_gather_element),
PCI_DMA_BIDIRECTIONAL);
Expand Down Expand Up @@ -2365,7 +2365,7 @@ static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id
command = list_entry(lh, struct sbp2_command_info, list);
pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma,
sizeof(command->scatter_gather_element),
PCI_DMA_BIDIRECTIONAL);
Expand Down Expand Up @@ -2548,7 +2548,7 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
pci_dma_sync_single_for_cpu(hi->host->pdev,
command->command_orb_dma,
sizeof(struct sbp2_command_orb),
PCI_DMA_BIDIRECTIONAL);
PCI_DMA_TODEVICE);
pci_dma_sync_single_for_cpu(hi->host->pdev,
command->sge_dma,
sizeof(command->scatter_gather_element),
Expand Down

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