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Commit ae786624 authored by Dan Williams's avatar Dan Williams
Browse files

ioat3: support xor via pq descriptors 



If a platform advertises pq capabilities, but not xor, then use
ioat3_prep_pqxor and ioat3_prep_pqxor_val to simulate xor support.

Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent d69d235b

drivers/dma/ioat/dma_v3.c

+49 −0
Original line number Diff line number Diff line
@@ -766,6 +766,44 @@ ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, 
				    flags);

}



static struct dma_async_tx_descriptor *

ioat3_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,

		 unsigned int src_cnt, size_t len, unsigned long flags)

{

	unsigned char scf[src_cnt];

	dma_addr_t pq[2];



	memset(scf, 0, src_cnt);

	flags |= DMA_PREP_PQ_DISABLE_Q;

	pq[0] = dst;

	pq[1] = ~0;



	return __ioat3_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len,

				    flags);

}



struct dma_async_tx_descriptor *

ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,

		     unsigned int src_cnt, size_t len,

		     enum sum_check_flags *result, unsigned long flags)

{

	unsigned char scf[src_cnt];

	dma_addr_t pq[2];



	/* the cleanup routine only sets bits on validate failure, it

	 * does not clear bits on validate success... so clear it here

	 */

	*result = 0;



	memset(scf, 0, src_cnt);

	flags |= DMA_PREP_PQ_DISABLE_Q;

	pq[0] = src[0];

	pq[1] = ~0;



	return __ioat3_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1, scf,

				    len, flags);

}



static void __devinit ioat3_dma_test_callback(void *dma_async_param)

{

	struct completion *cmp = dma_async_param;
@@ -1084,6 +1122,17 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) 


		dma_cap_set(DMA_PQ_VAL, dma->cap_mask);

		dma->device_prep_dma_pq_val = ioat3_prep_pq_val;



		if (!(cap & IOAT_CAP_XOR)) {

			dma->max_xor = 8;

			dma->xor_align = 2;



			dma_cap_set(DMA_XOR, dma->cap_mask);

			dma->device_prep_dma_xor = ioat3_prep_pqxor;



			dma_cap_set(DMA_XOR_VAL, dma->cap_mask);

			dma->device_prep_dma_xor_val = ioat3_prep_pqxor_val;

		}

	}



	/* -= IOAT ver.3 workarounds =- */