Commit 00f0a51f authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

DAC960: don't use block layer bounce buffers 



DAC960 just sets the block bounce limit to the dma mask, which means
that the iommu or swiotlb already take care of the bounce buffering,
and the block bouncing can be removed.

Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5c26e050

drivers/block/DAC960.c

+2 −7
Original line number Diff line number Diff line
@@ -1179,7 +1179,6 @@ static bool DAC960_V1_EnableMemoryMailboxInterface(DAC960_Controller_T 


  if (pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))

	return DAC960_Failure(Controller, "DMA mask out of range");

  Controller->BounceBufferLimit = DMA_BIT_MASK(32);



  if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller)) {

    CommandMailboxesSize =  0;
@@ -1380,11 +1379,8 @@ static bool DAC960_V2_EnableMemoryMailboxInterface(DAC960_Controller_T 
  dma_addr_t	CommandMailboxDMA;

  DAC960_V2_CommandStatus_T CommandStatus;



	if (!pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(64)))

		Controller->BounceBufferLimit = DMA_BIT_MASK(64);

	else if (!pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))

		Controller->BounceBufferLimit = DMA_BIT_MASK(32);

	else

	if (pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(64)) &&

	    pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))

		return DAC960_Failure(Controller, "DMA mask out of range");



  /* This is a temporary dma mapping, used only in the scope of this function */
@@ -2540,7 +2536,6 @@ static bool DAC960_RegisterBlockDevice(DAC960_Controller_T *Controller) 
		continue;

  	}

  	Controller->RequestQueue[n] = RequestQueue;

  	blk_queue_bounce_limit(RequestQueue, Controller->BounceBufferLimit);

  	RequestQueue->queuedata = Controller;

	blk_queue_max_segments(RequestQueue, Controller->DriverScatterGatherLimit);

	blk_queue_max_hw_sectors(RequestQueue, Controller->MaxBlocksPerCommand);

drivers/block/DAC960.h

+0 −1
Original line number Diff line number Diff line
@@ -2295,7 +2295,6 @@ typedef struct DAC960_Controller 
  unsigned short MaxBlocksPerCommand;

  unsigned short ControllerScatterGatherLimit;

  unsigned short DriverScatterGatherLimit;

  u64		BounceBufferLimit;

  unsigned int CombinedStatusBufferLength;

  unsigned int InitialStatusLength;

  unsigned int CurrentStatusLength;

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