drm/i915/gtt: Downgrade gen7 (ivb, byt, hsw) back to aliasing-ppgtt

Full-ppgtt on gen7 is proving to be highly unstable and not robust.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/694
Fixes: 3cd6e8860ecd ("drm/i915/gen7: Re-enable full-ppgtt for ivb & hsw")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200224101120.4024481-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 24b1f0c..1d678aa 100644 (file)
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -437,7 +437,7 @@ static const struct intel_device_info snb_m_gt2_info = {
        .has_rc6 = 1, \
        .has_rc6p = 1, \
        .has_rps = true, \
-       .ppgtt_type = INTEL_PPGTT_FULL, \
+       .ppgtt_type = INTEL_PPGTT_ALIASING, \
        .ppgtt_size = 31, \
        IVB_PIPE_OFFSETS, \
        IVB_CURSOR_OFFSETS, \
@@ -494,7 +494,7 @@ static const struct intel_device_info vlv_info = {
        .has_rps = true,
        .display.has_gmch = 1,
        .display.has_hotplug = 1,
-       .ppgtt_type = INTEL_PPGTT_FULL,
+       .ppgtt_type = INTEL_PPGTT_ALIASING,
        .ppgtt_size = 31,
        .has_snoop = true,
        .has_coherent_ggtt = false,