[PATCH i-g-t v3] tests/gem_exec_schedule: Add test for resetting preemptive batch

[Antonio Argenziano <antonio.argenziano@xxxxxxxxx>]

This patch adds a test that will trigger a preemption of a low priority
batch by a 'bad' batch buffer which will hang. The test aims at making
sure that a hanging high priority batch will not disrupt the submission
flow of low priority contexts.

-v2:
	- Rename subtest (Chris)
	- Use igt_hang_ctx to hang ring (Chris)
	- Add comment on execution order checks (Chris)

-v3:
	- Use library call to consume hang (Chris)
	- Use a more explicit name for array size (Chris)

Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Winiarski <michal.winiarski@xxxxxxxxx>
Signed-off-by: Antonio Argenziano <antonio.argenziano@xxxxxxxxx>
Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
 tests/gem_exec_schedule.c | 44 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index d0f85b3e..8cad15d9 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -41,6 +41,7 @@
 #define MIN_PRIO LOCAL_I915_CONTEXT_MIN_USER_PRIORITY
 
 #define BUSY_QLEN 8
+#define MAX_ELSP_QLEN 16
 
 IGT_TEST_DESCRIPTION("Check that we can control the order of execution");
 
@@ -362,7 +363,7 @@ static void preempt(int fd, unsigned ring, unsigned flags)
 {
 	uint32_t result = gem_create(fd, 4096);
 	uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
-	igt_spin_t *spin[16];
+	igt_spin_t *spin[MAX_ELSP_QLEN];
 	uint32_t ctx[2];
 	igt_hang_t hang;
 
@@ -408,7 +409,7 @@ static void preempt_other(int fd, unsigned ring)
 {
 	uint32_t result = gem_create(fd, 4096);
 	uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
-	igt_spin_t *spin[16];
+	igt_spin_t *spin[MAX_ELSP_QLEN];
 	unsigned int other;
 	unsigned int n, i;
 	uint32_t ctx[3];
@@ -466,7 +467,7 @@ static void preempt_self(int fd, unsigned ring)
 {
 	uint32_t result = gem_create(fd, 4096);
 	uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
-	igt_spin_t *spin[16];
+	igt_spin_t *spin[MAX_ELSP_QLEN];
 	unsigned int other;
 	unsigned int n, i;
 	uint32_t ctx[3];
@@ -515,6 +516,40 @@ static void preempt_self(int fd, unsigned ring)
 	gem_close(fd, result);
 }
 
+static void preemptive_hang(int fd, unsigned ring)
+{
+	igt_spin_t *spin[MAX_ELSP_QLEN];
+	igt_hang_t hang;
+	uint32_t ctx[2];
+
+	ctx[HI] = gem_context_create(fd);
+	gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
+
+	for (int n = 0; n < 16; n++) {
+		ctx[LO] = gem_context_create(fd);
+		gem_context_set_priority(fd, ctx[LO], MIN_PRIO);
+
+		spin[n] = __igt_spin_batch_new(fd, ctx[LO], ring, 0);
+		igt_debug("spin[%d].handle=%d\n", n, spin[n]->handle);
+
+		gem_context_destroy(fd, ctx[LO]);
+	}
+
+	hang = igt_hang_ctx(fd, ctx[HI], ring, 0, NULL);
+	igt_post_hang_ring(fd, hang);
+
+	for (int n = 0; n < 16; n++) {
+		/* Current behavior is to execute requests in order of submission.
+		 * This is subject to change as the scheduler evolve. The test should
+		 * be updated to reflect such changes.
+		 */
+		igt_assert(gem_bo_busy(fd, spin[n]->handle));
+		igt_spin_batch_free(fd, spin[n]);
+	}
+
+	gem_context_destroy(fd, ctx[HI]);
+}
+
 static void deep(int fd, unsigned ring)
 {
 #define XS 8
@@ -1044,6 +1079,9 @@ igt_main
 							preempt(fd, e->exec_id | e->flags, NEW_CTX | HANG_LP);
 						}
 
+						igt_subtest_f("preemptive-hang-%s", e->name)
+							preemptive_hang(fd, e->exec_id | e->flags);
+
 						igt_fixture {
 							igt_disallow_hang(fd, hang);
 							igt_fork_hang_detector(fd);
-- 
2.14.2

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