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authorBen Skeggs <bskeggs@redhat.com>2017-11-01 03:56:19 +1000
committerBen Skeggs <bskeggs@redhat.com>2017-11-02 13:32:27 +1000
commiteb813999f20097d24310836dfa07a97e2eb0c936 (patch)
tree1e5290cf803d532451e346e833a827a2690e88a5 /drivers/dio/dio-driver.c
parentbda9e379f61f937af7ee9b2a32d54bc50a94cd80 (diff)
drm/nouveau/mmu: implement new vmm backend
This is the common code to support a rework of the VMM backends. It adds support for more than 2 levels of page table nesting, which is required to be able to support GP100's MMU layout. Sparse mappings (that don't cause MMU faults when accessed) are now supported, where the backend provides it. Dual-PT handling had to become more sophisticated to support sparse, but this also allows us to support an optimisation the MMU provides on GK104 and newer. Certain operations can now be combined into a single page tree walk to avoid some overhead, but also enables optimsations like skipping PTE unmap writes when the PT will be destroyed anyway. The old backend has been hacked up to forward requests onto the new backend, if present, so that it's possible to bisect between issues in the backend changes vs the upcoming frontend changes. Until the new frontend has been merged, new backends will leak BAR2 page tables on module unload. This is expected, and it's not worth the effort of hacking around this as it doesn't effect runtime. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/dio/dio-driver.c')
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