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authorChristoph Hellwig <hch@lst.de>2018-05-09 15:59:43 +0200
committerJens Axboe <axboe@kernel.dk>2018-05-11 15:07:54 -0600
commit00f0a51f0b211d40fa1dda09355a68928edc556c (patch)
tree710aa8d26ed78b527ec4f0c6b8b452bfde41ab77
parent5c26e05039cce3e73c9ffa7290c7f181b851e0df (diff)
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: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/block/DAC960.c9
-rw-r--r--drivers/block/DAC960.h1
2 files changed, 2 insertions, 8 deletions
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index f781eff7d23e..c9ba48519d0f 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -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);
diff --git a/drivers/block/DAC960.h b/drivers/block/DAC960.h
index 21aff470d268..1439e651928b 100644
--- a/drivers/block/DAC960.h
+++ b/drivers/block/DAC960.h
@@ -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;