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path: root/drivers/dma/dmatest.c
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Diffstat (limited to 'drivers/dma/dmatest.c')
-rw-r--r--drivers/dma/dmatest.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index ffe621695e47..a4f608837849 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -21,6 +21,10 @@
#include <linux/slab.h>
#include <linux/wait.h>
+static bool nobounce;
+module_param(nobounce, bool, 0644);
+MODULE_PARM_DESC(nobounce, "Prevent using swiotlb buffer (default: use swiotlb buffer)");
+
static unsigned int test_buf_size = 16384;
module_param(test_buf_size, uint, 0644);
MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
@@ -90,6 +94,7 @@ MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
/**
* struct dmatest_params - test parameters.
+ * @nobounce: prevent using swiotlb buffer
* @buf_size: size of the memcpy test buffer
* @channel: bus ID of the channel to test
* @device: bus ID of the DMA Engine to test
@@ -106,6 +111,7 @@ MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
* @polled: use polling for completion instead of interrupts
*/
struct dmatest_params {
+ bool nobounce;
unsigned int buf_size;
char channel[20];
char device[32];
@@ -215,6 +221,7 @@ struct dmatest_done {
struct dmatest_data {
u8 **raw;
u8 **aligned;
+ gfp_t gfp_flags;
unsigned int cnt;
unsigned int off;
};
@@ -533,7 +540,7 @@ static int dmatest_alloc_test_data(struct dmatest_data *d,
goto err;
for (i = 0; i < d->cnt; i++) {
- d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
+ d->raw[i] = kmalloc(buf_size + align, d->gfp_flags);
if (!d->raw[i])
goto err;
@@ -655,6 +662,13 @@ static int dmatest_func(void *data)
goto err_free_coefs;
}
+ src->gfp_flags = GFP_KERNEL;
+ dst->gfp_flags = GFP_KERNEL;
+ if (params->nobounce) {
+ src->gfp_flags = GFP_DMA;
+ dst->gfp_flags = GFP_DMA;
+ }
+
if (dmatest_alloc_test_data(src, buf_size, align) < 0)
goto err_free_coefs;
@@ -1093,6 +1107,7 @@ static void add_threaded_test(struct dmatest_info *info)
struct dmatest_params *params = &info->params;
/* Copy test parameters */
+ params->nobounce = nobounce;
params->buf_size = test_buf_size;
strscpy(params->channel, strim(test_channel), sizeof(params->channel));
strscpy(params->device, strim(test_device), sizeof(params->device));