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authorSimon Ser <contact@emersion.fr>2021-08-23 17:41:08 +0200
committerSimon Zeni <simon@bl4ckb0ne.ca>2021-08-25 10:05:37 -0400
commit5dfaf5ea9ccaeddc236ca103147415b520f73d98 (patch)
tree19ca7a4000277e9c9849282bbfe5f4b000f3fed0 /include/render
parent749b3c00f0d0cb3575c8f058ea8c5e9877d4fd9c (diff)
backend/drm: introduce wlr_drm_bo_handle_table
Using GBM to import DRM dumb buffers tends to not work well. By using GBM we're calling some driver-specific functions in Mesa. These functions check whether Mesa can work with the buffer. Sometimes Mesa has requirements which differ from DRM dumb buffers and the GBM import will fail (e.g. on amdgpu). Instead, drop GBM and use drmPrimeFDToHandle directly. But there's a twist: BO handles are not ref'counted by the kernel and need to be ref'counted in user-space [1]. libdrm usually performs this bookkeeping and is used under-the-hood by Mesa. We can't re-use libdrm for this task without using driver-specific APIs. So let's just re-implement the ref'counting logic in wlroots. The wlroots implementation is inspired from amdgpu's in libdrm [2]. Closes: https://github.com/swaywm/wlroots/issues/2916 [1]: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110 [2]: https://gitlab.freedesktop.org/mesa/drm/-/blob/1a4c0ec9aea13211997f982715fe5ffcf19dd067/amdgpu/handle_table.c
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