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 <haavard.skinnemoen@atmel.com> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@ -217,6 +217,10 @@ static int dmatest_func(void *data)
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chan = thread->chan;
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while (!kthread_should_stop()) {
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struct dma_device *dev = chan->device;
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struct dma_async_tx_descriptor *tx;
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dma_addr_t dma_src, dma_dest;
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total_tests++;
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len = dmatest_random() % test_buf_size + 1;
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@ -226,10 +230,30 @@ static int dmatest_func(void *data)
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dmatest_init_srcbuf(thread->srcbuf, src_off, len);
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dmatest_init_dstbuf(thread->dstbuf, dst_off, len);
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cookie = dma_async_memcpy_buf_to_buf(chan,
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thread->dstbuf + dst_off,
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thread->srcbuf + src_off,
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len);
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dma_src = dma_map_single(dev->dev, thread->srcbuf + src_off,
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len, DMA_TO_DEVICE);
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/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
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dma_dest = dma_map_single(dev->dev, thread->dstbuf,
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test_buf_size, DMA_BIDIRECTIONAL);
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tx = dev->device_prep_dma_memcpy(chan, dma_dest + dst_off,
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dma_src, len,
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DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP);
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if (!tx) {
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dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
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dma_unmap_single(dev->dev, dma_dest,
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test_buf_size, DMA_BIDIRECTIONAL);
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pr_warning("%s: #%u: prep error with src_off=0x%x "
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"dst_off=0x%x len=0x%x\n",
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thread_name, total_tests - 1,
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src_off, dst_off, len);
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msleep(100);
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failed_tests++;
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continue;
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}
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tx->callback = NULL;
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cookie = tx->tx_submit(tx);
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if (dma_submit_error(cookie)) {
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pr_warning("%s: #%u: submit error %d with src_off=0x%x "
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"dst_off=0x%x len=0x%x\n",
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@ -253,6 +277,9 @@ static int dmatest_func(void *data)
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failed_tests++;
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continue;
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}
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/* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
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dma_unmap_single(dev->dev, dma_dest,
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test_buf_size, DMA_BIDIRECTIONAL);
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error_count = 0;
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