[igt-dev] [PATCH i-g-t] lib: Restore the i915.reset modparam before cleaning up

[Chris Wilson]

We force a reset on test exit so that we can rapidly cleanup after a
naughty test, it is not unknown for us to leave a queue of hanging
batches around. However, if we have also fiddled with the i915.reset
parameter in the meantime, this can leave the kernel unable to fulfil
our request (and those naughty batches continue to disrupt testing).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Petri Latvala <petri.latvala at intel.com>
---
 lib/drmtest.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/drmtest.c b/lib/drmtest.c
index 1964795a6..6c0a0e381 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -54,6 +54,7 @@
 #include "igt_device.h"
 #include "igt_gt.h"
 #include "igt_kmod.h"
+#include "igt_sysfs.h"
 #include "version.h"
 #include "config.h"
 #include "intel_reg.h"
@@ -345,6 +346,7 @@ static void __cancel_work_at_exit(int fd)
 {
 	igt_terminate_spin_batches(); /* for older kernels */
 
+	igt_sysfs_set_parameter(fd, "reset", "%x", -1u /* any method */);
 	igt_drop_caches_set(fd,
 			    /* cancel everything */
 			    DROP_RESET_ACTIVE | DROP_RESET_SEQNO |
-- 
2.20.1