0b100760e3
On gen8 and onwards, we can mark GPU accesses through the ppGTT as being read-only, that is cause any GPU write onto that page to be discarded (not triggering a fault). This is all that we need to finally support the read-only flag for userptr! v2: Check default address space for read only support as a proxy for the user context/ppgtt. Testcase: igt/gem_userptr_blits/readonly* Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jon Bloomfield <jon.bloomfield@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> Reviewed-by: Jon Bloomfield <jon.bloomfield@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180712191430.9269-1-chris@chris-wilson.co.uk |
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