@@ -17,6 +17,8 @@
#include "intel_engine_types.h"
#include "intel_sseu.h"
+#define CONTEXT_REDZONE POISON_INUSE
+
struct i915_gem_context;
struct i915_vma;
struct intel_context;
@@ -37,8 +37,24 @@ static int __engine_unpark(struct intel_wakeref *wf)
/* Discard stale context state from across idling */
ce = engine->kernel_context;
- if (ce)
+ if (ce) {
+ GEM_BUG_ON(test_bit(CONTEXT_VALID_BIT, &ce->flags));
+
+ /* First poison the image to verify we never fully trust it */
+ if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) && ce->state) {
+ struct drm_i915_gem_object *obj = ce->state->obj;
+ int type = i915_coherent_map_type(engine->i915);
+
+ map = i915_gem_object_pin_map(obj, type);
+ if (!IS_ERR(map)) {
+ memset(map, CONTEXT_REDZONE, obj->base.size);
+ i915_gem_object_flush_map(obj);
+ i915_gem_object_unpin_map(obj);
+ }
+ }
+
ce->ops->reset(ce);
+ }
if (engine->unpark)
engine->unpark(engine);
@@ -2568,7 +2568,7 @@ set_redzone(void *vaddr, const struct intel_engine_cs *engine)
vaddr += engine->context_size;
- memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
+ memset(vaddr, CONTEXT_REDZONE, I915_GTT_PAGE_SIZE);
}
static void
@@ -2579,7 +2579,7 @@ check_redzone(const void *vaddr, const struct intel_engine_cs *engine)
vaddr += engine->context_size;
- if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE))
+ if (memchr_inv(vaddr, CONTEXT_REDZONE, I915_GTT_PAGE_SIZE))
dev_err_once(engine->i915->drm.dev,
"%s context redzone overwritten!\n",
engine->name);