drm/i915: Create bind/unbind abstraction for VMAs
To sum up what goes on here, we abstract the vma binding, similarly to the previous object binding. This helps for distinguishing legacy binding, versus modern binding. To keep the code churn as minimal as possible, I am leaving in insert_entries(). It serves as the per platform pte writing basically. bind_vma and insert_entries do share a lot of similarities, and I did have designs to combine the two, but as mentioned already... too much churn in an already massive patchset. What follows are the 3 commits which existed discretely in the original submissions. Upon rebasing on Broadwell support, it became clear that separation was not good, and only made for more error prone code. Below are the 3 commit messages with all their history. drm/i915: Add bind/unbind object functions to VMA drm/i915: Use the new vm [un]bind functions drm/i915: reduce vm->insert_entries() usage drm/i915: Add bind/unbind object functions to VMA As we plumb the code with more VM information, it has become more obvious that the easiest way to deal with bind and unbind is to simply put the function pointers in the vm, and let those choose the correct way to handle the page table updates. This change allows many places in the code to simply be vm->bind, and not have to worry about distinguishing PPGTT vs GGTT. Notice that this patch has no impact on functionality. I've decided to save the actual change until the next patch because I think it's easier to review that way. I'm happy to squash the two, or let Daniel do it on merge. v2: Make ggtt handle the quirky aliasing ppgtt Add flags to bind object to support above Don't ever call bind/unbind directly for PPGTT until we have real, full PPGTT (use NULLs to assert this) Make sure we rebind the ggtt if there already is a ggtt binding. This happens on set cache levels. Use VMA for bind/unbind (Daniel, Ben) v3: Reorganize ggtt_vma_bind to be more concise and easier to read (Ville). Change logic in unbind to only unbind ggtt when there is a global mapping, and to remove a redundant check if the aliasing ppgtt exists. v4: Make the bind function a bit smarter about the cache levels to avoid unnecessary multiple remaps. "I accept it is a wart, I think unifying the pin_vma / bind_vma could be unified later" (Chris) Removed the git notes, and put version info here. (Daniel) v5: Update the comment to not suck (Chris) v6: Move bind/unbind to the VMA. It makes more sense in the VMA structure (always has, but I was previously lazy). With this change, it will allow us to keep a distinct insert_entries. Reviewed-by:Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Ben Widawsky <ben@bwidawsk.net> drm/i915: Use the new vm [un]bind functions Building on the last patch which created the new function pointers in the VM for bind/unbind, here we actually put those new function pointers to use. Split out as a separate patch to aid in review. I'm fine with squashing into the previous patch if people request it. v2: Updated to address the smart ggtt which can do aliasing as needed Make sure we bind to global gtt when mappable and fenceable. I thought we could get away without this initialy, but we cannot. v3: Make the global GTT binding explicitly use the ggtt VM for bind_vma(). While at it, use the new ggtt_vma helper (Chris) At this point the original mailing list thread diverges. ie. v4^: use target_obj instead of obj for gen6 relocate_entry vma->bind_vma() can be called safely during pin. So simply do that instead of the complicated conditionals. Don't restore PPGTT bound objects on resume path Bug fix in resume path for globally bound Bos Properly handle secure dispatch Rebased on vma bind/unbind conversion Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch>
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