This syncs up with the protocol of what eventually landed in virglrender.
1) Move all static params to capset to avoid having to query host
(reduce synchronous round trips at startup)
2) Use res_id instead of host_handle.. costs extra hashtable lookups in
host during submit, but this lets us (with userspace allocated IOVA)
make bo alloc and import completely async.
3) Require userspace allocated IOVA to simplify the protocol and not
have to deal with GEM_NEW/GEM_INFO potentially being synchronous.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16086>
If supported by host virglrenderer and host kernel, use userspace
allocated GPU virtual addresses. This lets us avoid stalling on
waiting for response from host kernel until we need to know the
host handle (which is usually not until submit time).
Handling the async response from host to get host_handle is done
thru the submit_queue, so that in the submit path (hot) we do not
need any additional synchronization to know that the host_handle
is valid.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16086>
Add a new backend to enable using native driver in a VM guest, via a new
virtgpu context type which (indirectly) makes host kernel interface
available in guest and handles the details of mapping buffers to guest,
etc.
Note that fence-fd's are currently a bit awkward, in that they get
signaled by the guest kernel driver (drm/virtio) once virglrenderer in
the host has processed the execbuf, not when host kernel has signaled
the submit fence. For passing buffers to the host (virtio-wl) the egl
context in virglrenderer is used to create a fence on the host side.
But use of out-fence-fd's in guest could have slightly unexpected
results. For this reason we limit all submitqueues to default priority
(so they cannot be preepmted by host egl context). AFAICT virgl and
venus have a similar problem, which will eventually be solveable once we
have RESOURCE_CREATE_SYNC.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14900>
Rob Clark