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Message-Id: <1230305468-18021-1-git-send-email-anemo@mba.ocn.ne.jp> Date: Sat, 27 Dec 2008 00:31:08 +0900 From: Atsushi Nemoto <anemo@....ocn.ne.jp> To: linux-kernel@...r.kernel.org Cc: hskinnemoen@...el.com, maciej.sosnowski@...el.com, dan.j.williams@...el.com, ralf@...ux-mips.org Subject: [PATCH] dmatest: flush and invalidate destination buffer before DMA 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@....ocn.ne.jp> --- drivers/dma/dmatest.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index ed9636b..6b747dc 100644 --- a/drivers/dma/dmatest.c +++ b/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; @@ -226,6 +227,12 @@ 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, -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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