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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 <seraj.alijan@sondrel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Seraj Alijan 2018-12-10 08:52:39 +00:00 committed by Vinod Koul
parent a875abfadf
commit 13396a130f
1 changed files with 22 additions and 6 deletions
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28
drivers/dma/dmatest.c
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@ -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);