[igt-dev] [PATCH i-g-t 2/3] Force spin-batch to cause a hang as required

[Chris Wilson]

When using a spinner to trigger a hang, make it unpreemptable so that it
appears like a true hang.

References: https://bugs.freedesktop.org/show_bug.cgi?id=109661
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_eio.c        | 4 +++-
 tests/i915/gem_exec_fence.c | 3 ++-
 tests/kms_busy.c            | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/tests/i915/gem_eio.c b/tests/i915/gem_eio.c
index dcbcefa97..c5831c3a4 100644
--- a/tests/i915/gem_eio.c
+++ b/tests/i915/gem_eio.c
@@ -176,7 +176,9 @@ static igt_spin_t * __spin_poll(int fd, uint32_t ctx, unsigned long flags)
 	struct igt_spin_factory opts = {
 		.ctx = ctx,
 		.engine = flags,
-		.flags = IGT_SPIN_FAST | IGT_SPIN_FENCE_OUT,
+		.flags = (IGT_SPIN_FAST |
+			  IGT_SPIN_NO_PREEMPTION |
+			  IGT_SPIN_FENCE_OUT),
 	};
 
 	if (gem_can_store_dword(fd, opts.engine))
diff --git a/tests/i915/gem_exec_fence.c b/tests/i915/gem_exec_fence.c
index 0befb54f8..f5bdf5851 100644
--- a/tests/i915/gem_exec_fence.c
+++ b/tests/i915/gem_exec_fence.c
@@ -331,7 +331,8 @@ static void test_fence_await(int fd, unsigned ring, unsigned flags)
 
 	spin = igt_spin_new(fd,
 			    .engine = ring,
-			    .flags = IGT_SPIN_FENCE_OUT);
+			    .flags = (IGT_SPIN_FENCE_OUT |
+				      IGT_SPIN_NO_PREEMPTION));
 	igt_assert(spin->out_fence != -1);
 
 	i = 0;
diff --git a/tests/kms_busy.c b/tests/kms_busy.c
index 66f26cd08..7e5ab3d19 100644
--- a/tests/kms_busy.c
+++ b/tests/kms_busy.c
@@ -271,7 +271,8 @@ static void test_pageflip_modeset_hang(igt_display_t *dpy,
 
 	t = igt_spin_new(dpy->drm_fd,
 			 .engine = ring,
-			 .dependency = fb.gem_handle);
+			 .dependency = fb.gem_handle,
+			 .flags = IGT_SPIN_NO_PREEMPTION);
 
 	do_or_die(drmModePageFlip(dpy->drm_fd, dpy->pipes[pipe].crtc_id, fb.fb_id, DRM_MODE_PAGE_FLIP_EVENT, &fb));
 
-- 
2.23.0.rc1