dmatest: add support for skipping verification and random data setup

Towards enabling dmatest to checkout performance add a 'noverify' mode.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 33 insertions, 11 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 01ac7112b5fd..d07b73275d0f 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -66,6 +66,10 @@ module_param(timeout, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
                  "Pass -1 for infinite timeout");
 
+static bool noverify;
+module_param(noverify, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(noverify, "Disable random data setup and verification");
+
 /**
  * struct dmatest_params - test parameters.
  * @buf_size:           size of the memcpy test buffer
@@ -88,6 +92,7 @@ struct dmatest_params {
         unsigned int    xor_sources;
         unsigned int    pq_sources;
         int             timeout;
+        bool            noverify;
 };
 
 /**
@@ -435,18 +440,30 @@ static int dmatest_func(void *data)
                         break;
                 }
 
-                len = dmatest_random() % params->buf_size + 1;
+                if (params->noverify) {
+                        len = params->buf_size;
+                        src_off = 0;
+                        dst_off = 0;
+                } else {
+                        len = dmatest_random() % params->buf_size + 1;
+                        len = (len >> align) << align;
+                        if (!len)
+                                len = 1 << align;
+                        src_off = dmatest_random() % (params->buf_size - len + 1);
+                        dst_off = dmatest_random() % (params->buf_size - len + 1);
+
+                        src_off = (src_off >> align) << align;
+                        dst_off = (dst_off >> align) << align;
+
+                        dmatest_init_srcs(thread->srcs, src_off, len,
+                                          params->buf_size);
+                        dmatest_init_dsts(thread->dsts, dst_off, len,
+                                          params->buf_size);
+                }
+
                 len = (len >> align) << align;
                 if (!len)
                         len = 1 << align;
-                src_off = dmatest_random() % (params->buf_size - len + 1);
-                dst_off = dmatest_random() % (params->buf_size - len + 1);
-
-                src_off = (src_off >> align) << align;
-                dst_off = (dst_off >> align) << align;
-
-                dmatest_init_srcs(thread->srcs, src_off, len, params->buf_size);
-                dmatest_init_dsts(thread->dsts, dst_off, len, params->buf_size);
 
                 for (i = 0; i < src_cnt; i++) {
                         u8 *buf = thread->srcs[i] + src_off;
@@ -555,10 +572,14 @@ static int dmatest_func(void *data)
                 unmap_src(dev->dev, dma_srcs, len, src_cnt);
                 unmap_dst(dev->dev, dma_dsts, params->buf_size, dst_cnt);
 
-                error_count = 0;
+                if (params->noverify) {
+                        dbg_result("test passed", total_tests, src_off, dst_off,
+                                   len, 0);
+                        continue;
+                }
 
                 pr_debug("%s: verifying source buffer...\n", current->comm);
-                error_count += dmatest_verify(thread->srcs, 0, src_off,
+                error_count = dmatest_verify(thread->srcs, 0, src_off,
                                 0, PATTERN_SRC, true);
                 error_count += dmatest_verify(thread->srcs, src_off,
                                 src_off + len, src_off,
@@ -773,6 +794,7 @@ static void run_threaded_test(struct dmatest_info *info)
         params->xor_sources = xor_sources;
         params->pq_sources = pq_sources;
         params->timeout = timeout;
+        params->noverify = noverify;
 
         request_channels(info, DMA_MEMCPY);
         request_channels(info, DMA_XOR);