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dmatest: Use custom map/unmap for destination buffer

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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>
This commit is contained in:
Atsushi Nemoto 2009-01-13 09:22:20 -07:00 • committed by Dan Williams
parent 6527de6d6d
commit d86be86e9a
1 changed files with 31 additions and 4 deletions
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35
drivers/dma/dmatest.c
View file

@ -217,6 +217,10 @@ static int dmatest_func(void *data)
chan = thread->chan; chan = thread->chan;
while (!kthread_should_stop()) { 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++; total_tests++;
len = dmatest_random() % test_buf_size + 1; 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_srcbuf(thread->srcbuf, src_off, len);
dmatest_init_dstbuf(thread->dstbuf, dst_off, len); dmatest_init_dstbuf(thread->dstbuf, dst_off, len);
cookie = dma_async_memcpy_buf_to_buf(chan, dma_src = dma_map_single(dev->dev, thread->srcbuf + src_off,
thread->dstbuf + dst_off, len, DMA_TO_DEVICE);
thread->srcbuf + src_off, /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
len); 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)) { if (dma_submit_error(cookie)) {
pr_warning("%s: #%u: submit error %d with src_off=0x%x " pr_warning("%s: #%u: submit error %d with src_off=0x%x "
"dst_off=0x%x len=0x%x\n", "dst_off=0x%x len=0x%x\n",
@ -253,6 +277,9 @@ static int dmatest_func(void *data)
failed_tests++; failed_tests++;
continue; 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; error_count = 0;