drm/i915/tgl: Disable read-only ppgtt support

The same read-only affliction as befell Icelake is affecting Tigerlake.
Disable the read-only support as clearly it was not fixed.

Testcase: igt/i915_selftests/live_gem_context
References: 3936867dbc1e ("drm/i915: Disable read only ppgtt support for gen11")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190911125717.28997-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e4f66bf..a09a9b6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1486,8 +1486,10 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
         *
         * Gen11 has HSDES#:1807136187 unresolved. Disable ro support
         * for now.
+        *
+        * Gen12 has inherited the same read-only fault issue from gen11.
         */
-       ppgtt->vm.has_read_only = INTEL_GEN(i915) != 11;
+       ppgtt->vm.has_read_only = !IS_GEN_RANGE(i915, 11, 12);
 
        /* There are only few exceptions for gen >=6. chv and bxt.
         * And we are not sure about the latter so play safe for now.