On 14/09/2018 10:21, Chris Wilson wrote:
Check we can indeed acquire a WB mapping of the context image on module
load. Later this will give us the opportunity to validate that we can
switch from WC to WB as required.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index be9d012d851b..37353afec66e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5424,6 +5424,7 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915)
for_each_engine(engine, i915, id) {
struct i915_vma *state;
+ void *vaddr;
state = to_intel_context(ctx, engine)->state;
if (!state)
@@ -5446,6 +5447,16 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915)
goto err_active;
engine->default_state = i915_gem_object_get(state->obj);
+
+ /* Check we can acquire the image of the context state */
+ vaddr = i915_gem_object_pin_map(engine->default_state,
+ I915_MAP_WB);
+ if (IS_ERR(vaddr)) {
+ err = PTR_ERR(vaddr);
+ goto err_active;
+ }
+
+ i915_gem_object_unpin_map(engine->default_state);
Ah this perhaps strengthens the argument to have
__intel_engines_pin_default_state? (And the unpin pair.)
And I guess you made this patch come before the switch to WC since it is
not FORCE_WB here?
Regards,
Tvrtko
}
if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
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