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Commit 2adfc550 authored by Dan Williams's avatar Dan Williams
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ioat3: disable cacheline-unaligned transfers for raid operations 



There are cases where cacheline-unaligned raid operations can hang the
dma channel.  Simply disable these operations by increasing the
alignment constraints published to async_tx.  The raid456 driver always
issues page aligned requests, so the only in-kernel user of the ioatdma
driver that is affected by this change is dmatest.

Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 074cc476

drivers/dma/ioat/dma_v3.c

+3 −3
Original line number Diff line number Diff line
@@ -1175,7 +1175,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) 
	if (cap & IOAT_CAP_XOR) {

		is_raid_device = true;

		dma->max_xor = 8;

		dma->xor_align = 2;

		dma->xor_align = 6;



		dma_cap_set(DMA_XOR, dma->cap_mask);

		dma->device_prep_dma_xor = ioat3_prep_xor;
@@ -1186,7 +1186,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) 
	if (cap & IOAT_CAP_PQ) {

		is_raid_device = true;

		dma_set_maxpq(dma, 8, 0);

		dma->pq_align = 2;

		dma->pq_align = 6;



		dma_cap_set(DMA_PQ, dma->cap_mask);

		dma->device_prep_dma_pq = ioat3_prep_pq;
@@ -1196,7 +1196,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) 


		if (!(cap & IOAT_CAP_XOR)) {

			dma->max_xor = 8;

			dma->xor_align = 2;

			dma->xor_align = 6;



			dma_cap_set(DMA_XOR, dma->cap_mask);

			dma->device_prep_dma_xor = ioat3_prep_pqxor;