[PATCH v2 10/14] drm/i915: Exercise request cancellation using a mock selftest

Chris Wilson
2017-02-14T09:54:29Z

Add a mock selftest to preempt a request and check that we cancel it,
requeue the request and then complete its execution.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/selftests/i915_gem_request.c | 59 +++++++++++++++++++++++
drivers/gpu/drm/i915/selftests/mock_request.c | 19 ++++++++
drivers/gpu/drm/i915/selftests/mock_request.h | 2 +
3 files changed, 80 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_request.c b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
index 9d056a86723d..c803ef60a127 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
@@ -26,6 +26,7 @@

#include "../i915_selftest.h"

+#include "mock_context.h"
#include "mock_gem_device.h"

static int igt_add_request(void *arg)
@@ -181,12 +182,70 @@ static int igt_fence_wait(void *arg)
return err;
}

+static int igt_request_rewind(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct drm_i915_gem_request *request, *vip;
+ struct i915_gem_context *ctx[2];
+ int err = -EINVAL;
+
+ mutex_lock(&i915->drm.struct_mutex);
+ ctx[0] = mock_context(i915, "A");
+ request = mock_request(i915->engine[RCS], ctx[0], 2 * HZ);
+ if (!request) {
+ err = -ENOMEM;
+ goto err_device;
+ }
+ i915_add_request(request);
+
+ ctx[1] = mock_context(i915, "B");
+ vip = mock_request(i915->engine[RCS], ctx[1], 0);
+ if (!vip) {
+ err = -ENOMEM;
+ goto err_locked;
+ }
+
+ /* Simulate preemption by manual reordering */
+ if (!mock_cancel_request(request)) {
+ pr_err("failed to cancel request (already executed)!\n");
+ i915_add_request(vip);
+ goto err_locked;
+ }
+ i915_add_request(vip);
+ request->engine->submit_request(request);
+
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ if (i915_wait_request(vip, 0, HZ) == -ETIME) {
+ pr_err("timed out waiting for high priority request, vip.seqno=%d, current seqno=%d\n",
+ vip->global_seqno, intel_engine_get_seqno(i915->engine[RCS]));
+ goto err;
+ }
+
+ if (i915_gem_request_completed(request)) {
+ pr_err("low priority request already completed\n");
+ goto err;
+ }
+
+ err = 0;
+err:
+ mutex_lock(&i915->drm.struct_mutex);
+err_locked:
+ mock_context_close(ctx[1]);
+ mock_context_close(ctx[0]);
+err_device:
+ mock_device_flush(i915);
+ mutex_unlock(&i915->drm.struct_mutex);
+ return err;
+}
+
int i915_gem_request_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_add_request),
SUBTEST(igt_wait_request),
SUBTEST(igt_fence_wait),
+ SUBTEST(igt_request_rewind),
};
struct drm_i915_private *i915;
int err;
diff --git a/drivers/gpu/drm/i915/selftests/mock_request.c b/drivers/gpu/drm/i915/selftests/mock_request.c
index e23242d1b88a..0e8d2e7f8c70 100644
--- a/drivers/gpu/drm/i915/selftests/mock_request.c
+++ b/drivers/gpu/drm/i915/selftests/mock_request.c
@@ -22,6 +22,7 @@
*
*/

+#include "mock_engine.h"
#include "mock_request.h"

struct drm_i915_gem_request *
@@ -42,3 +43,21 @@ mock_request(struct intel_engine_cs *engine,

return &mock->base;
}
+
+bool mock_cancel_request(struct drm_i915_gem_request *request)
+{
+ struct mock_request *mock = container_of(request, typeof(*mock), base);
+ struct mock_engine *engine =
+ container_of(request->engine, typeof(*engine), base);
+ bool was_queued;
+
+ spin_lock_irq(&engine->hw_lock);
+ was_queued = !list_empty(&mock->link);
+ list_del_init(&mock->link);
+ spin_unlock_irq(&engine->hw_lock);
+
+ if (was_queued)
+ i915_gem_request_unsubmit(request);
+
+ return was_queued;
+}
diff --git a/drivers/gpu/drm/i915/selftests/mock_request.h b/drivers/gpu/drm/i915/selftests/mock_request.h
index cc76d4f4eb4e..4dea74c8e96d 100644
--- a/drivers/gpu/drm/i915/selftests/mock_request.h
+++ b/drivers/gpu/drm/i915/selftests/mock_request.h
@@ -41,4 +41,6 @@ mock_request(struct intel_engine_cs *engine,
struct i915_gem_context *context,
unsigned long delay);

+bool mock_cancel_request(struct drm_i915_gem_request *request);
+
#endif /* !__MOCK_REQUEST__ */
--
2.11.0