lib: Add prime_sync_start and prime_sync_end helpers

This patch adds dma-buf mmap synchronization ioctls that can be used by tests
for cache coherency management e.g. when CPU and GPU domains are being accessed
through dma-buf at the same time.

v7: add sync invalid flags test.

Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

3 files changed, 68 insertions, 0 deletions

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 171f5261..8c7e939d 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -1493,6 +1493,32 @@ 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)
+{
+	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;
+	do_ioctl(dma_buf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_start);
+}
+
+/**
+ * prime_sync_end
+ * @dma_buf_fd: dma-buf fd handle
+ */
+void prime_sync_end(int dma_buf_fd)
+{
+	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;
+	do_ioctl(dma_buf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_end);
+}
+
+/**
  * igt_require_fb_modifiers:
  * @fd: Open DRM file descriptor.
  *
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index 57e0a00b..200b2dab 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -153,6 +153,21 @@ void gem_require_caching(int fd);
 void gem_require_ring(int fd, int ring_id);
 
 /* prime */
+struct local_dma_buf_sync {
+	uint64_t flags;
+};
+
+#define LOCAL_DMA_BUF_SYNC_READ      (1 << 0)
+#define LOCAL_DMA_BUF_SYNC_WRITE     (2 << 0)
+#define LOCAL_DMA_BUF_SYNC_RW        (LOCAL_DMA_BUF_SYNC_READ | LOCAL_DMA_BUF_SYNC_WRITE)
+#define LOCAL_DMA_BUF_SYNC_START     (0 << 2)
+#define LOCAL_DMA_BUF_SYNC_END       (1 << 2)
+#define LOCAL_DMA_BUF_SYNC_VALID_FLAGS_MASK \
+		(LOCAL_DMA_BUF_SYNC_RW | LOCAL_DMA_BUF_SYNC_END)
+
+#define LOCAL_DMA_BUF_BASE 'b'
+#define LOCAL_DMA_BUF_IOCTL_SYNC _IOW(LOCAL_DMA_BUF_BASE, 0, struct local_dma_buf_sync)
+
 int prime_handle_to_fd(int fd, uint32_t handle);
 #ifndef DRM_RDWR
 #define DRM_RDWR O_RDWR
@@ -160,6 +175,8 @@ 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);
 
 /* addfb2 fb modifiers */
 struct local_drm_mode_fb_cmd2 {
diff --git a/tests/prime_mmap.c b/tests/prime_mmap.c
index 269ada6d..29a0cfd5 100644
--- a/tests/prime_mmap.c
+++ b/tests/prime_mmap.c
@@ -401,6 +401,30 @@ test_errors(void)
 	gem_close(fd, handle);
 }
 
+/* Test for invalid flags on sync ioctl */
+static void
+test_invalid_sync_flags(void)
+{
+	int i, dma_buf_fd;
+	uint32_t handle;
+	struct local_dma_buf_sync sync;
+	int invalid_flags[] = {-1,
+	                       0x00,
+	                       LOCAL_DMA_BUF_SYNC_RW + 1,
+	                       LOCAL_DMA_BUF_SYNC_VALID_FLAGS_MASK + 1};
+
+	handle = gem_create(fd, BO_SIZE);
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	for (i = 0; i < sizeof(invalid_flags) / sizeof(invalid_flags[0]); i++) {
+		memset(&sync, 0, sizeof(sync));
+		sync.flags = invalid_flags[i];
+
+		drmIoctl(dma_buf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync);
+		igt_assert_eq(errno, EINVAL);
+		errno = 0;
+	}
+}
+
 static void
 test_aperture_limit(void)
 {
@@ -473,6 +497,7 @@ igt_main
 		{ "test_dup", test_dup },
 		{ "test_userptr", test_userptr },
 		{ "test_errors", test_errors },
+		{ "test_invalid_sync_flags", test_invalid_sync_flags },
 		{ "test_aperture_limit", test_aperture_limit },
 	};
 	int i;