From d86be86e9aab221089d72399072511f13fe2a771 Mon Sep 17 00:00:00 2001 From: Atsushi Nemoto Date: Tue, 13 Jan 2009 09:22:20 -0700 Subject: [PATCH] dmatest: Use custom map/unmap for destination buffer The dmatest driver should use DMA_BIDIRECTIONAL on the destination buffer to ensure that the poison values are written to RAM and not just written to cache and discarded. Acked-by: Haavard Skinnemoen Acked-by: Maciej Sosnowski Signed-off-by: Atsushi Nemoto Signed-off-by: Dan Williams --- drivers/dma/dmatest.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 3603f1ea5b28..732fa1ec36ab 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -217,6 +217,10 @@ static int dmatest_func(void *data) chan = thread->chan; while (!kthread_should_stop()) { + struct dma_device *dev = chan->device; + struct dma_async_tx_descriptor *tx; + dma_addr_t dma_src, dma_dest; + total_tests++; len = dmatest_random() % test_buf_size + 1; @@ -226,10 +230,30 @@ static int dmatest_func(void *data) dmatest_init_srcbuf(thread->srcbuf, src_off, len); dmatest_init_dstbuf(thread->dstbuf, dst_off, len); - cookie = dma_async_memcpy_buf_to_buf(chan, - thread->dstbuf + dst_off, - thread->srcbuf + src_off, - len); + dma_src = dma_map_single(dev->dev, thread->srcbuf + src_off, + len, DMA_TO_DEVICE); + /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ + dma_dest = dma_map_single(dev->dev, thread->dstbuf, + test_buf_size, DMA_BIDIRECTIONAL); + + tx = dev->device_prep_dma_memcpy(chan, dma_dest + dst_off, + dma_src, len, + DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP); + if (!tx) { + dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE); + dma_unmap_single(dev->dev, dma_dest, + test_buf_size, DMA_BIDIRECTIONAL); + pr_warning("%s: #%u: prep error with src_off=0x%x " + "dst_off=0x%x len=0x%x\n", + thread_name, total_tests - 1, + src_off, dst_off, len); + msleep(100); + failed_tests++; + continue; + } + tx->callback = NULL; + cookie = tx->tx_submit(tx); + if (dma_submit_error(cookie)) { pr_warning("%s: #%u: submit error %d with src_off=0x%x " "dst_off=0x%x len=0x%x\n", @@ -253,6 +277,9 @@ static int dmatest_func(void *data) failed_tests++; continue; } + /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */ + dma_unmap_single(dev->dev, dma_dest, + test_buf_size, DMA_BIDIRECTIONAL); error_count = 0; -- 2.39.2