wayland: Additional fixes for PRIME and cursor handling#834
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Open the DRM render node separately and pass it to gbm_create_device() instead of reusing the KMS primary fd. This matches how wlroots-based compositors initialize rendering and avoids hardware-specific issues (e.g. amdgpu refusing ACCEL_WORKING queries on the primary fd) that cause Mesa to fall back to software rendering. Fall back to the primary fd if no render node is available.
…arate fds When the GBM device fd differs from the KMS fd (render node vs primary node), GEM handles from GBM are not valid on the KMS fd. Export each handle as a dmabuf via drmPrimeHandleToFD and re-import it on the KMS fd before calling drmModeAddFB2. Close the imported handles after the FB takes its own reference.
With GBM now on the render node, cursor BOs created via the render node GBM device have GEM handles that are invalid on the KMS fd, causing drmModeSetCursor to fail on every frame. Create a second GBM device from the KMS fd specifically for cursor BO allocation. This keeps cursor GEM handles in the KMS fd's namespace where the cursor plane expects them.
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This is being reviewed - experimental.