drm/i915/selftests: Sabotague the RING_HEAD

Apply vast quantities of poison and not tell anyone to see if we fall
for the trap of using a stale RING_HEAD.

References: 42827350f75c ("drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211205615.1190127-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index e53bfed..26d39c1 100644 (file)
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -300,6 +300,84 @@ static int live_unlite_preempt(void *arg)
        return live_unlite_restore(arg, I915_USER_PRIORITY(I915_PRIORITY_MAX));
 }
 
+static int live_pin_rewind(void *arg)
+{
+       struct intel_gt *gt = arg;
+       struct intel_engine_cs *engine;
+       enum intel_engine_id id;
+       int err = 0;
+
+       /*
+        * We have to be careful not to trust intel_ring too much, for example
+        * ring->head is updated upon retire which is out of sync with pinning
+        * the context. Thus we cannot use ring->head to set CTX_RING_HEAD,
+        * or else we risk writing an older, stale value.
+        *
+        * To simulate this, let's apply a bit of deliberate sabotague.
+        */
+
+       for_each_engine(engine, gt, id) {
+               struct intel_context *ce;
+               struct i915_request *rq;
+               struct intel_ring *ring;
+               struct igt_live_test t;
+
+               if (igt_live_test_begin(&t, gt->i915, __func__, engine->name)) {
+                       err = -EIO;
+                       break;
+               }
+
+               ce = intel_context_create(engine);
+               if (IS_ERR(ce)) {
+                       err = PTR_ERR(ce);
+                       break;
+               }
+
+               err = intel_context_pin(ce);
+               if (err) {
+                       intel_context_put(ce);
+                       break;
+               }
+
+               /* Keep the context awake while we play games */
+               err = i915_active_acquire(&ce->active);
+               if (err) {
+                       intel_context_unpin(ce);
+                       intel_context_put(ce);
+                       break;
+               }
+               ring = ce->ring;
+
+               /* Poison the ring, and offset the next request from HEAD */
+               memset32(ring->vaddr, STACK_MAGIC, ring->size / sizeof(u32));
+               ring->emit = ring->size / 2;
+               ring->tail = ring->emit;
+               GEM_BUG_ON(ring->head);
+
+               intel_context_unpin(ce);
+
+               /* Submit a simple nop request */
+               GEM_BUG_ON(intel_context_is_pinned(ce));
+               rq = intel_context_create_request(ce);
+               i915_active_release(&ce->active); /* e.g. async retire */
+               intel_context_put(ce);
+               if (IS_ERR(rq)) {
+                       err = PTR_ERR(rq);
+                       break;
+               }
+               GEM_BUG_ON(!rq->head);
+               i915_request_add(rq);
+
+               /* Expect not to hang! */
+               if (igt_live_test_end(&t)) {
+                       err = -EIO;
+                       break;
+               }
+       }
+
+       return err;
+}
+
 static int live_hold_reset(void *arg)
 {
        struct intel_gt *gt = arg;
@@ -3629,6 +3707,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
                SUBTEST(live_sanitycheck),
                SUBTEST(live_unlite_switch),
                SUBTEST(live_unlite_preempt),
+               SUBTEST(live_pin_rewind),
                SUBTEST(live_hold_reset),
                SUBTEST(live_error_interrupt),
                SUBTEST(live_timeslice_preempt),