[igt-dev] [Intel-gfx] [PATCH i-g-t] kms_busy: Use igt_waitchildren_timeout()

[Daniel Vetter]

On Sat, Mar 30, 2019 at 11:54:48PM +0000, Chris Wilson wrote:
> Replace the convoluted raising of SIGALRM from the child with an
> interruptible sleep in the parent with the equivalent and far more
> natural igt_waitchildren_timeout().
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103182
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

I guess v2 missing here somewhere? Either way nice cleanup!

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  tests/kms_busy.c | 31 +++++--------------------------
>  1 file changed, 5 insertions(+), 26 deletions(-)
> 
> diff --git a/tests/kms_busy.c b/tests/kms_busy.c
> index ed3caae4c..321db8207 100644
> --- a/tests/kms_busy.c
> +++ b/tests/kms_busy.c
> @@ -29,9 +29,6 @@
>  
>  IGT_TEST_DESCRIPTION("Basic check of KMS ABI with busy framebuffers.");
>  
> -#define FRAME_TIME 16 /* milleseconds */
> -#define TIMEOUT (6*16)
> -
>  static igt_output_t *
>  set_fb_on_crtc(igt_display_t *dpy, int pipe, struct igt_fb *fb)
>  {
> @@ -70,17 +67,13 @@ static void do_cleanup_display(igt_display_t *dpy)
>  	igt_display_commit2(dpy, dpy->is_atomic ? COMMIT_ATOMIC : COMMIT_LEGACY);
>  }
>  
> -static void sighandler(int sig)
> -{
> -}
> -
>  static void flip_to_fb(igt_display_t *dpy, int pipe,
>  		       igt_output_t *output,
>  		       struct igt_fb *fb, unsigned ring,
>  		       const char *name, bool modeset)
>  {
>  	struct pollfd pfd = { .fd = dpy->drm_fd, .events = POLLIN };
> -	struct timespec tv = { 1, 0 };
> +	const int timeout = modeset ? 8500 : 100;
>  	struct drm_event_vblank ev;
>  
>  	igt_spin_t *t = igt_spin_batch_new(dpy->drm_fd,
> @@ -114,24 +107,14 @@ static void flip_to_fb(igt_display_t *dpy, int pipe,
>  						  DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
>  		}
>  
> -		kill(getppid(), SIGALRM);
> -		igt_assert(gem_bo_busy(dpy->drm_fd, fb->gem_handle));
> -		igt_assert_f(poll(&pfd, 1, modeset ? 8500 : TIMEOUT) == 0,
> +		igt_assert_f(poll(&pfd, 1, timeout) == 0,
>  			     "flip completed whilst %s was busy [%d]\n",
>  			     name, gem_bo_busy(dpy->drm_fd, fb->gem_handle));
> +		igt_assert(gem_bo_busy(dpy->drm_fd, fb->gem_handle));
>  	}
>  
> -	igt_assert_f(nanosleep(&tv, NULL) == -1,
> -		     "flip to %s blocked waiting for busy fb", name);
> -
> -	igt_waitchildren();
> -
> -	if (!modeset) {
> -		tv.tv_sec = 0;
> -		tv.tv_nsec = (2 * TIMEOUT) * 1000000ULL;
> -		nanosleep(&tv, NULL);
> -	}
> -
> +	igt_waitchildren_timeout(5 * timeout,
> +				 "flip blocked waiting for busy bo\n");
>  	igt_spin_batch_end(t);
>  
>  	igt_assert(read(dpy->drm_fd, &ev, sizeof(ev)) == sizeof(ev));
> @@ -160,8 +143,6 @@ static void test_flip(igt_display_t *dpy, unsigned ring, int pipe, bool modeset)
>  	if (modeset)
>  		igt_require(dpy->is_atomic);
>  
> -	signal(SIGALRM, sighandler);
> -
>  	output = set_fb_on_crtc(dpy, pipe, &fb[0]);
>  	igt_display_commit2(dpy, COMMIT_LEGACY);
>  
> @@ -194,8 +175,6 @@ static void test_flip(igt_display_t *dpy, unsigned ring, int pipe, bool modeset)
>  	do_cleanup_display(dpy);
>  	igt_remove_fb(dpy->drm_fd, &fb[1]);
>  	igt_remove_fb(dpy->drm_fd, &fb[0]);
> -
> -	signal(SIGALRM, SIG_DFL);
>  }
>  
>  static void test_atomic_commit_hang(igt_display_t *dpy, igt_plane_t *primary,
> -- 
> 2.20.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch