drm/i915/selftests: add local workqueue for SW fence selftest

Instead of using a global workqueue for the SW fence selftest,
allocate a separate one temporarily only while running the test.

Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/313f4a713053c2b4896ced5b0e9ff456eb85fe57.1686231190.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
index daa985e..8f5ce71 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
@@ -523,12 +523,19 @@ static void task_ipc(struct work_struct *work)
 static int test_ipc(void *arg)
 {
        struct task_ipc ipc;
+       struct workqueue_struct *wq;
        int ret = 0;
 
+       wq = alloc_workqueue("i1915-selftest", 0, 0);
+       if (wq == NULL)
+               return -ENOMEM;
+
        /* Test use of i915_sw_fence as an interprocess signaling mechanism */
        ipc.in = alloc_fence();
-       if (!ipc.in)
-               return -ENOMEM;
+       if (!ipc.in) {
+               ret = -ENOMEM;
+               goto err_work;
+       }
        ipc.out = alloc_fence();
        if (!ipc.out) {
                ret = -ENOMEM;
@@ -540,7 +547,7 @@ static int test_ipc(void *arg)
 
        ipc.value = 0;
        INIT_WORK_ONSTACK(&ipc.work, task_ipc);
-       schedule_work(&ipc.work);
+       queue_work(wq, &ipc.work);
 
        wait_for_completion(&ipc.started);
 
@@ -563,6 +570,9 @@ static int test_ipc(void *arg)
        free_fence(ipc.out);
 err_in:
        free_fence(ipc.in);
+err_work:
+       destroy_workqueue(wq);
+
        return ret;
 }