From 13396a130ffec45a736bcc08ad92d35e45f67dd8 Mon Sep 17 00:00:00 2001 From: Seraj Alijan Date: Mon, 10 Dec 2018 08:52:39 +0000 Subject: [PATCH] dmaengine: dmatest: Add transfer_size parameter Existing transfer size "len" is either generated randomly or set to the size of test_buf_size. In some cases we need to explicitly specify a transfer size that is different from the buffer size and non aligned to test the target device's ability to handle unaligned transfers. This patch adds optional parameter "transfer_size" to allow setting explicit transfer size for dma transfers. Signed-off-by: Seraj Alijan Signed-off-by: Vinod Koul --- drivers/dma/dmatest.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 6302ebef2938..2eea4ef72915 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -83,6 +83,10 @@ static int alignment = -1; module_param(alignment, int, 0644); MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))"); +static unsigned int transfer_size; +module_param(transfer_size, uint, 0644); +MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))"); + /** * struct dmatest_params - test parameters. * @buf_size: size of the memcpy test buffer @@ -108,6 +112,7 @@ struct dmatest_params { bool noverify; bool norandom; int alignment; + unsigned int transfer_size; }; /** @@ -643,15 +648,25 @@ static int dmatest_func(void *data) total_tests++; - if (params->norandom) + if (params->transfer_size) { + if (params->transfer_size >= params->buf_size) { + pr_err("%u-byte transfer size must be lower than %u-buffer size\n", + params->transfer_size, params->buf_size); + break; + } + len = params->transfer_size; + } else if (params->norandom) { len = params->buf_size; - else + } else { len = dmatest_random() % params->buf_size + 1; + } - len = (len >> align) << align; - if (!len) - len = 1 << align; - + /* Do not alter transfer size explicitly defined by user */ + if (!params->transfer_size) { + len = (len >> align) << align; + if (!len) + len = 1 << align; + } total_len += len; if (params->norandom) { @@ -1047,6 +1062,7 @@ static void add_threaded_test(struct dmatest_info *info) params->noverify = noverify; params->norandom = norandom; params->alignment = alignment; + params->transfer_size = transfer_size; request_channels(info, DMA_MEMCPY); request_channels(info, DMA_MEMSET);