gbm: Add map/unmap functions

This adds map and unmap functions to GBM utilizing the DRIimage extension
mapImage/unmapImage functions or existing internal mapping for dumb
buffers. Unlike prior attempts, this version provides a region to map and
usage flags for the mapping. The operation follows the same semantics as
the gallium transfer_map() function.

This was tested with GBM based gralloc on Android.

Signed-off-by: Rob Herring <robh@kernel.org>
[Emil Velikov: drop no longer relevant hunk from commit message.]
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gbm/backends/dri/gbm_driint.h b/src/gbm/backends/dri/gbm_driint.h
index b51cc4d90c..46bb5c1561 100644
--- a/src/gbm/backends/dri/gbm_driint.h
+++ b/src/gbm/backends/dri/gbm_driint.h
@@ -30,6 +30,7 @@
 
 #include <sys/mman.h>
 #include "gbmint.h"
+#include "c11/threads.h"
 
 #include "common_drm.h"
 
@@ -45,6 +46,8 @@ struct gbm_dri_device {
    void *driver;
 
    __DRIscreen *screen;
+   __DRIcontext *context;
+   mtx_t mutex;
 
    const __DRIcoreExtension   *core;
    const __DRIdri2Extension   *dri2;