When we require GEM, reset the global seqno. This gives each test a
clean slate to work with, and avoids left-over state from previous tests
impacting on the next. In particular, somes tests may be setting up long
sequence of stalling batches not expecting to hit a seqno wraparound
(leftover from, for example, gem_exec_whisper), causing long GPU hangs if
they do.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
lib/ioctl_wrappers.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 118dcefe7..39e8469e3 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -52,6 +52,7 @@
#include "intel_chipset.h"
#include "intel_io.h"
#include "igt_debugfs.h"
+#include "igt_sysfs.h"
#include "config.h"
#ifdef HAVE_VALGRIND
@@ -1411,7 +1412,8 @@ void igt_require_gem(int fd)
igt_require_intel(fd);
- /* We only want to use the throttle-ioctl for its -EIO reporting
+ /*
+ * We only want to use the throttle-ioctl for its -EIO reporting
* of a wedged device, not for actually waiting on outstanding
* requests! So create a new drm_file for the device that is clean.
*/
@@ -1419,6 +1421,18 @@ void igt_require_gem(int fd)
fd = open(path, O_RDWR);
igt_assert_lte(0, fd);
+ /*
+ * Reset the global seqno at the start of each test. This ensures that
+ * the test will not wrap unless it explicitly sets up seqno wrapping
+ * itself, which avoids accidentally hanging when setting up long
+ * sequences of batches.
+ */
+ err = igt_debugfs_dir(fd);
+ if (err != -1) {
+ igt_sysfs_printf(err, "i915_next_seqno", "1");
+ close(err);
+ }
+
err = 0;
if (ioctl(fd, DRM_IOCTL_I915_GEM_THROTTLE))
err = -errno;
--
2.15.1
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