drm/i915: Skip capturing errors from internal contexts

We don't want to report errors on the internal contexts to userspace,
suppressing their own, so treat them as simulated errors. These mostly
arise inside selftests and so are simulated anyway. For the rest, we can
rely on the normal debug channels in CI.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200128113426.3711294-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/selftests/mock_context.c

@@ -83,6 +83,8 @@ live_context(struct drm_i915_private *i915, struct file *file)
 	if (IS_ERR(ctx))
 		return ctx;
 
+	i915_gem_context_set_no_error_capture(ctx);
+
 	err = gem_context_register(ctx, to_drm_file(file)->driver_priv, &id);
 	if (err < 0)
 		goto err_ctx;

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -1228,7 +1228,7 @@ static bool record_context(struct i915_gem_context_coredump *e,
 {
 	struct i915_gem_context *ctx;
 	struct task_struct *task;
-	bool capture;
+	bool simulated;
 
 	rcu_read_lock();
 	ctx = rcu_dereference(rq->context->gem_context);
@@ -1236,7 +1236,7 @@ static bool record_context(struct i915_gem_context_coredump *e,
 		ctx = NULL;
 	rcu_read_unlock();
 	if (!ctx)
-		return false;
+		return true;
 
 	rcu_read_lock();
 	task = pid_task(ctx->pid, PIDTYPE_PID);
@@ -1250,10 +1250,10 @@ static bool record_context(struct i915_gem_context_coredump *e,
 	e->guilty = atomic_read(&ctx->guilty_count);
 	e->active = atomic_read(&ctx->active_count);
 
-	capture = i915_gem_context_no_error_capture(ctx);
+	simulated = i915_gem_context_no_error_capture(ctx);
 
 	i915_gem_context_put(ctx);
-	return capture;
+	return simulated;
 }
 
 struct intel_engine_capture_vma {