From ae786624c27411c1d38823f640b39f3d97412d5a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 17:43:00 -0700 Subject: 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: Dan Williams --- drivers/dma/ioat/dma_v3.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'drivers/dma/ioat') diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index ca2af0fa1c36..bb57491f3fb3 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -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 =- */ -- cgit v1.2.3