Commit 13396a13 authored by Seraj Alijan's avatar Seraj Alijan Committed by Vinod Koul
Browse files

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: default avatarSeraj Alijan <seraj.alijan@sondrel.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent a875abfa

drivers/dma/dmatest.c

+22 −6
Original line number Diff line number Diff line
@@ -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;

		}



		/* 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);

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