drm/i915/gtt: Read-only pages for insert_entries on bdw+
authorJon Bloomfield <jon.bloomfield@intel.com>
Thu, 12 Jul 2018 18:53:11 +0000 (19:53 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Fri, 13 Jul 2018 15:12:03 +0000 (16:12 +0100)
commit250f8c8140ac0a5e5acb91891d6813f12778b224
tree7a097292cd7ec9c46ad89274feaa4be08ad37527
parent25dda4dabeeb12af5209b0183c788ef2a88dabbe
drm/i915/gtt: Read-only pages for insert_entries on bdw+

Hook up the flags to allow read-only ppGTT mappings for gen8+

v2: Include a selftest to check that writes to a readonly PTE are
dropped
v3: Don't duplicate cpu_check() as we can just reuse it, and even worse
don't wholesale copy the theory-of-operation comment from igt_ctx_exec
without changing it to explain the intention behind the new test!
v4: Joonas really likes magic mystery values

Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180712185315.3288-2-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/i915_gem_gtt.c
drivers/gpu/drm/i915/i915_gem_gtt.h
drivers/gpu/drm/i915/intel_ringbuffer.c
drivers/gpu/drm/i915/selftests/i915_gem_context.c