drm/i915/selftests: Disable shrinker across mmap-exhaustion

For mmap-exhaustion, we deliberately put the system under a large amount
of pressure to ensure that we are able to reap mmap-offsets from dead
objects. If background activity does that reaping for us, that defeats
the purpose of the test and in some cases will fail our sanity checks
(because of the fake activity we use to prevent the idle worker).

Fixes: 932cac10c8fb ("drm/i915/selftests: Prevent background reaping of acti
ve objects")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181011103748.18387-1-chris@chris-wilson.co.uk
(cherry picked from commit 0b4bf7ca9be824dde6ff63dd2ceba2d1367f8a58)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_object.c b/drivers/gpu/drm/i915/selftests/i915_gem_object.c
index 6d3516d5bff9e5154d83da66033950e132acc7b9..c3999dd2021e4b76816a50ab0df6396205df5e2b 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_object.c
@@ -501,6 +501,8 @@ static bool assert_mmap_offset(struct drm_i915_private *i915,
 
 static void disable_retire_worker(struct drm_i915_private *i915)
 {
+       i915_gem_shrinker_unregister(i915);
+
        mutex_lock(&i915->drm.struct_mutex);
        if (!i915->gt.active_requests++) {
                intel_runtime_pm_get(i915);
@@ -613,6 +615,7 @@ out_park:
        else
                queue_delayed_work(i915->wq, &i915->gt.idle_work, 0);
        mutex_unlock(&i915->drm.struct_mutex);
+       i915_gem_shrinker_register(i915);
        return err;
 err_obj:
        i915_gem_object_put(obj);