drm/i915/execlists: Protect peeking at execlists->active

Now that we dropped the engine->active.lock serialisation from around
process_csb(), direct submission can run concurrently to the interrupt
handler. As such execlists->active may be advanced as we dequeue,
dropping the reference to the request. We need to employ our RCU request
protection to ensure that the request is not freed too early.

Fixes: 4a24537b5914 ("drm/i915/execlists: Lift process_csb() out of the irq-off spinlock")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191009100955.21477-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 6db762c509b8e7bd61568a0c0a84a92a530ab82f..7ea58335f04c8411fb9406ab14109508389bc059 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1289,7 +1289,7 @@ static void virtual_xfer_breadcrumbs(struct virtual_engine *ve,
 static struct i915_request *
 last_active(const struct intel_engine_execlists *execlists)
 {
-       struct i915_request * const *last = execlists->active;
+       struct i915_request * const *last = READ_ONCE(execlists->active);
 
        while (*last && i915_request_completed(*last))
                last++;
@@ -1981,8 +1981,11 @@ static void process_csb(struct intel_engine_cs *engine)
 static void __execlists_submission_tasklet(struct intel_engine_cs *const engine)
 {
        lockdep_assert_held(&engine->active.lock);
-       if (!engine->execlists.pending[0])
+       if (!engine->execlists.pending[0]) {
+               rcu_read_lock(); /* protect peeking at execlists->active */
                execlists_dequeue(engine);
+               rcu_read_unlock();
+       }
 }
 
 /*