On Thu, Feb 26, 2015 at 07:00:19PM -0800, Matt Roper wrote:
> We've been leaking the framebuffers that get created inside the
> legacy -> universal cursor compatibility layer and nobody noticed. Add
> an i-g-t test to check debugfs and ensure we end up the same number of
> framebuffers we started with after performing cursor operations.
>
> + /*
> + * Exercise both legacy and universal code paths. Note that legacy
> + * handling in the kernel redirects through universal codepaths
> + * internally, so that redirection is where we're most worried about
> + * leaking.
> + */
> + for (i = 0; i < 10; i++) {
> + igt_plane_set_fb(cursor, &cursor_fb[i]);
> + igt_display_commit2(display, COMMIT_UNIVERSAL);
> + }
> + for (i = 0; i < 10; i++) {
> + igt_plane_set_fb(cursor, &cursor_fb[i]);
> + igt_display_commit2(display, COMMIT_LEGACY);
> + }
Oh, magic igt. The comment had me searching for how COMMIT_UNIVERSAL
triggered DRM_MODE_CURSOR_BO - it took me a while to spot you had two
loops! I think it would be better to split these tests up (or at
least mix the combinations of universal | legacy) to have finer grained
tests in case something does go wrong again in the future.
Another useful test (that maybe xfail for a while) is to check that the
active cursor (and other planes) are cleared after close(fd).
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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