[PATCH igt v6 4/6] lib: Add prime_sync_start and prime_sync_end helpers

[Tiago Vignatti]

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.

Signed-off-by: Tiago Vignatti <tiago.vignatti at intel.com>
---
 lib/ioctl_wrappers.c | 26 ++++++++++++++++++++++++++
 lib/ioctl_wrappers.h | 15 +++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 86a61ba..0d84d00 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -1400,6 +1400,32 @@ 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 d3ffba2..cbd7a73 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -148,6 +148,19 @@ 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_RW        (3 << 0)
+#define LOCAL_DMA_BUF_SYNC_START     (0 << 2)
+#define LOCAL_DMA_BUF_SYNC_END       (1 << 2)
+#define DMA_BUF_SYNC_VALID_FLAGS_MASK \
+		(DMA_BUF_SYNC_RW | 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
@@ -155,6 +168,8 @@ 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 {
-- 
2.1.4