The patch titled
dmatest: flush and invalidate destination buffer before DMA
has been added to the -mm tree. Its filename is
dmatest-flush-and-invalidate-destination-buffer-before-dma.patch
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------------------------------------------------------
Subject: dmatest: flush and invalidate destination buffer before DMA
From: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
On non-coherent architectures, such as MIPS, the dmatest reports
mismatches on just before and after the DMA area. This is because test
patterns in the dstbuf discarded from cache without writing to main
memory.
Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
Cc: Maciej Sosnowski <maciej.sosnowski@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dma/dmatest.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN drivers/dma/dmatest.c~dmatest-flush-and-invalidate-destination-buffer-before-dma drivers/dma/dmatest.c
--- a/drivers/dma/dmatest.c~dmatest-flush-and-invalidate-destination-buffer-before-dma
+++ a/drivers/dma/dmatest.c
@@ -202,6 +202,7 @@ static int dmatest_func(void *data)
dma_cookie_t cookie;
enum dma_status status;
int ret;
+ dma_addr_t dma_dest;
thread_name = current->comm;
@@ -225,6 +226,12 @@ static int dmatest_func(void *data)
dmatest_init_srcbuf(thread->srcbuf, src_off, len);
dmatest_init_dstbuf(thread->dstbuf, dst_off, len);
+ /* flush and invalidate caches for whole dstbuf */
+ dma_dest = dma_map_single(chan->device->dev,
+ thread->dstbuf,
+ test_buf_size, DMA_BIDIRECTIONAL);
+ dma_unmap_single(chan->device->dev, dma_dest,
+ test_buf_size, DMA_BIDIRECTIONAL);
cookie = dma_async_memcpy_buf_to_buf(chan,
thread->dstbuf + dst_off,
_
Patches currently in -mm which might be from anemo@xxxxxxxxxxxxx are
origin.patch
linux-next.patch
dmatest-flush-and-invalidate-destination-buffer-before-dma.patch
physmap-make-map_info-customizable.patch
atmel_serial-might-lose-modem-status-change.patch
rtc-add-alarm-update-irq-interfaces-version-5.patch
rtc-add-rtc-tx4939-driver-v2.patch
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