@@ -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;
};
/**
@@ -636,15 +641,25 @@ static int dmatest_func(void *data)
break;
}
- 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) {
@@ -1042,6 +1057,7 @@ 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);
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> --- drivers/dma/dmatest.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-)