lib: Add read/write direction support for dmabuf synchronisation

Allow read-only synchronisation on dmabuf mmaps, useful to allow
concurrent read-read testing between the CPU and GPU.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

5 files changed, 21 insertions, 15 deletions

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 40712606..5d497293 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -1539,12 +1539,15 @@ off_t prime_get_size(int dma_buf_fd)
  * prime_sync_start
  * @dma_buf_fd: dma-buf fd handle
  */
-void prime_sync_start(int dma_buf_fd)
+void prime_sync_start(int dma_buf_fd, bool write)
 {
 	struct local_dma_buf_sync sync_start;
 
 	memset(&sync_start, 0, sizeof(sync_start));
-	sync_start.flags = LOCAL_DMA_BUF_SYNC_START | LOCAL_DMA_BUF_SYNC_RW;
+	sync_start.flags = LOCAL_DMA_BUF_SYNC_START;
+	sync_start.flags |= LOCAL_DMA_BUF_SYNC_READ;
+	if (write)
+		sync_start.flags |= LOCAL_DMA_BUF_SYNC_WRITE;
 	do_ioctl(dma_buf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_start);
 }
 
@@ -1552,12 +1555,15 @@ void prime_sync_start(int dma_buf_fd)
  * prime_sync_end
  * @dma_buf_fd: dma-buf fd handle
  */
-void prime_sync_end(int dma_buf_fd)
+void prime_sync_end(int dma_buf_fd, bool write)
 {
 	struct local_dma_buf_sync sync_end;
 
 	memset(&sync_end, 0, sizeof(sync_end));
-	sync_end.flags = LOCAL_DMA_BUF_SYNC_END | LOCAL_DMA_BUF_SYNC_RW;
+	sync_end.flags = LOCAL_DMA_BUF_SYNC_END;
+	sync_end.flags |= LOCAL_DMA_BUF_SYNC_READ;
+	if (write)
+		sync_end.flags |= LOCAL_DMA_BUF_SYNC_WRITE;
 	do_ioctl(dma_buf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_end);
 }
 
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index dc0827a1..f59eafba 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -177,8 +177,8 @@ int prime_handle_to_fd(int fd, uint32_t handle);
 int prime_handle_to_fd_for_mmap(int fd, uint32_t handle);
 uint32_t prime_fd_to_handle(int fd, int dma_buf_fd);
 off_t prime_get_size(int dma_buf_fd);
-void prime_sync_start(int dma_buf_fd);
-void prime_sync_end(int dma_buf_fd);
+void prime_sync_start(int dma_buf_fd, bool write);
+void prime_sync_end(int dma_buf_fd, bool write);
 
 /* addfb2 fb modifiers */
 struct local_drm_mode_fb_cmd2 {
diff --git a/tests/gem_concurrent_all.c b/tests/gem_concurrent_all.c
index f62901c9..8718f169 100644
--- a/tests/gem_concurrent_all.c
+++ b/tests/gem_concurrent_all.c
@@ -365,10 +365,10 @@ dmabuf_set_bo(struct buffers *b, drm_intel_bo *bo, uint32_t val)
 	uint32_t *v;
 	int size;
 
-	prime_sync_start(dmabuf->fd);
+	prime_sync_start(dmabuf->fd, true);
 	for (v = dmabuf->map, size = b->size; size--; v++)
 		*v = val;
-	prime_sync_end(dmabuf->fd);
+	prime_sync_end(dmabuf->fd, true);
 }
 
 static void
@@ -378,10 +378,10 @@ dmabuf_cmp_bo(struct buffers *b, drm_intel_bo *bo, uint32_t val)
 	uint32_t *v;
 	int size;
 
-	prime_sync_start(dmabuf->fd);
+	prime_sync_start(dmabuf->fd, false);
 	for (v = dmabuf->map, size = b->size; size--; v++)
 		igt_assert_eq_u32(*v, val);
-	prime_sync_end(dmabuf->fd);
+	prime_sync_end(dmabuf->fd, false);
 }
 
 static void
diff --git a/tests/kms_mmap_write_crc.c b/tests/kms_mmap_write_crc.c
index 6984bbd1..ae026b61 100644
--- a/tests/kms_mmap_write_crc.c
+++ b/tests/kms_mmap_write_crc.c
@@ -110,7 +110,7 @@ static void test(data_t *data)
 	 * firstly demonstrate the need for DMA_BUF_SYNC_START ("begin_cpu_access")
 	 */
 	if (ioctl_sync)
-		prime_sync_start(dma_buf_fd);
+		prime_sync_start(dma_buf_fd, true);
 
 	/* use dmabuf pointer to make the other fb all white too */
 	buf = malloc(fb->size);
@@ -142,7 +142,7 @@ static void test(data_t *data)
 
 	/* sync start, to move to CPU domain */
 	if (ioctl_sync)
-		prime_sync_start(dma_buf_fd);
+		prime_sync_start(dma_buf_fd, true);
 
 	/* use dmabuf pointer in the same fb to make it all white */
 	buf = malloc(fb->size);
@@ -154,7 +154,7 @@ static void test(data_t *data)
 	/* if we don't change to the GTT domain again, the whites won't get flushed
 	 * and therefore we demonstrates the need for sync end here */
 	if (ioctl_sync)
-		prime_sync_end(dma_buf_fd);
+		prime_sync_end(dma_buf_fd, true);
 
 	/* check that the crc is as expected, which requires that caches got flushed */
 	igt_pipe_crc_collect_crc(data->pipe_crc, &crc);
diff --git a/tests/prime_mmap_coherency.c b/tests/prime_mmap_coherency.c
index a9a2664a..180d8a4d 100644
--- a/tests/prime_mmap_coherency.c
+++ b/tests/prime_mmap_coherency.c
@@ -97,7 +97,7 @@ static void test_read_flush(bool expect_stale_cache)
 	 * until we try to read them again in step #4. This behavior could be fixed
 	 * by flush CPU read right before accessing the CPU pointer */
 	if (!expect_stale_cache)
-		prime_sync_start(dma_buf_fd);
+		prime_sync_start(dma_buf_fd, false);
 
 	for (i = 0; i < (width * height) / 4; i++)
 		if (ptr_cpu[i] != 0x11111111) {
@@ -149,7 +149,7 @@ static void test_write_flush(bool expect_stale_cache)
 	/* This is the main point of this test: !llc hw requires a cache write
 	 * flush right here (explained in step #4). */
 	if (!expect_stale_cache)
-		prime_sync_start(dma_buf_fd);
+		prime_sync_start(dma_buf_fd, true);
 
 	memset(ptr_cpu, 0x11, width * height);