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lib: Add read/write direction support for dmabuf synchronisation

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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>
This commit is contained in:
Chris Wilson
2016-02-25 21:43:01 +00:00
parent 925e5e1cae
commit aed69b56d4
5 changed files with 21 additions and 15 deletions
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lib/ioctl_wrappers.c
+10 -4
View File
@@ -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);
}
lib/ioctl_wrappers.h
+2 -2
View File
@@ -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 {