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Daniel Vetter
45d9c8dde4
Aside from deleting lots of code the real motivation here is to switch
the mmap over to VM_PFNMAP, to be more consistent with what real gpu
drivers do. They're all VM_PFNMAP, which means get_user_pages doesn't
work, and even if you try and there's a struct page behind that,
touching it and mucking around with its refcount can upset drivers
real bad.
v2: Review from Thomas:
- sort #include
- drop more dead code that I didn't spot somehow
v3: select DRM_GEM_SHMEM_HELPER to make it build (intel-gfx-ci)
v4: I got tricked by 0cf2ef46c6 ("drm/shmem-helper: Use cached
mappings by default"), and we need WC in vgem because vgem doesn't
have explicit begin/end cpu access ioctls.
Also add a comment why exactly vgem has to use wc.
v5: Don't set obj->base.funcs, it will default to drm_gem_shmem_funcs
(Thomas)
v6: vgem also needs an MMU for remapping
v7: I absolutely butchered the rebases over the vgem mmap change and
revert and broke the patch. Actually go back to v6 from before the
vgem mmap changes.
Cc: Thomas Zimmermann <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: "Christian König" <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Melissa Wen <[email protected]>
Cc: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]