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2926a1aa76
Now, only one instance of virgl_screen exists for a device
(/dev/dri/cardX), and it is shared by different frontends (eg GLX,
GBM, etc.). There is a problem with this, as follows:
/* Init GLX */
...
glXCreateContext(...);
...
/* GBM */
gbm_fd = open("/dev/dri/card0", O_RDWR);
dev = gbm_create_device(gbm_fd);
bo = gbm_bo_create(dev, ...);
plane_handle = gbm_bo_get_handle_for_plane(bo, ...);
drmPrimeHandleToFD(gbm_fd, handle.u32, flags, &plane_fd);
The above drmPrimeHandleToFD() call will fail with ENOENT.
The reason is that GBM and GLX share the same virgl_screen (file
descriptor), and it is not gbm_fd that is used to create gbm_bo,
but other fd (opened during GLX initialization). Since the scope
of prime handle is limited to drm_file, the above plane_handle is
invalid under gbm_fd.
By canceling the sharing of virgl_screen between different drm_files,
GBM can use the correct fd to create resources, thereby avoiding the
problem of invalid prime handle.
Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16738>
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| drm-shim | ||
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| etnaviv | ||
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| getopt | ||
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