Hi all,
I'm interesting in how mesa/kernel control cache ability of
render cache.
My question is based on SKL platform with console (no-X)
environment. We can take kmscube(https://github.com/robclark/kmscube.git)
as an example, it use mesa do rendering and use drm to show result on screen:
gbm_surface_create to create gbm_surface
eglCreateWindowSurface to create EGLSurface
eglMakeCurrent to bind context to EGLSurface
do rendering using glsl
eglSwapBuffers
drmModePageFlip to do page flip
As far as I know, display engine always read memory (not cache) of scanout
buffer directly. But mesa use Render Cache Data Port
to render to framebuffer, so the cache path is: Render Cache -> LLC -> Memory.
So what does mesa/kernel do to make render cache
coherent with Memory? (I have already seen that cache ability of LLC is set to
UC in MOCS of renderbufer. How about render cache?)
Also set render cache to UC? Or just flush render cache before display?
Thanks,
Chuanbo Weng
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