[PATCH i-g-t v2 1/2] lib/xe: Add sync and async xe_force_gt_reset options

[Jonathan Cavitt]

Add a new xe_force_gt_reset function, xe_force_gt_reset_sync, renaming
the original xe_force_gt_reset to xe_force_gt_reset_async.  This allows
the user to decide whether or not they want to initiate a synchronous or
asynchronous gt reset.  The asynchronous reset function was otherwise
unchanged, but the synchronous reset function operates by calling a new
debugfs function.

For now, default to using the asynchronous version for all current use
cases.

Suggested-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
CC: John Harrison <john.c.harrison at intel.com>
CC: Stuart Summers <stuart.summers at intel.com>
---
 lib/xe/xe_gt.c              |  2 +-
 lib/xe/xe_ioctl.c           | 15 ++++++++++++++-
 lib/xe/xe_ioctl.h           |  3 ++-
 tests/intel/xe_exec_reset.c |  8 ++++----
 tests/intel/xe_gt_freq.c    |  2 +-
 tests/intel/xe_wedged.c     |  2 +-
 6 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/lib/xe/xe_gt.c b/lib/xe/xe_gt.c
index 743d7a26ec..36e8fde363 100644
--- a/lib/xe/xe_gt.c
+++ b/lib/xe/xe_gt.c
@@ -69,7 +69,7 @@ void xe_force_gt_reset_all(int xe_fd)
 	int gt;
 
 	xe_for_each_gt(xe_fd, gt)
-		xe_force_gt_reset(xe_fd, gt);
+		xe_force_gt_reset_async(xe_fd, gt);
 }
 
 /**
diff --git a/lib/xe/xe_ioctl.c b/lib/xe/xe_ioctl.c
index 934c877ebc..6e3234cd3d 100644
--- a/lib/xe/xe_ioctl.c
+++ b/lib/xe/xe_ioctl.c
@@ -529,7 +529,7 @@ int64_t xe_wait_ufence(int fd, uint64_t *addr, uint64_t value,
 	return timeout;
 }
 
-void xe_force_gt_reset(int fd, int gt)
+void xe_force_gt_reset_async(int fd, int gt)
 {
 	char reset_string[128];
 	struct stat st;
@@ -541,3 +541,16 @@ void xe_force_gt_reset(int fd, int gt)
 		 minor(st.st_rdev), gt);
 	system(reset_string);
 }
+
+void xe_force_gt_reset_sync(int fd, int gt)
+{
+	char reset_string[128];
+	struct stat st;
+
+	igt_assert_eq(fstat(fd, &st), 0);
+
+	snprintf(reset_string, sizeof(reset_string),
+		 "cat /sys/kernel/debug/dri/%d/gt%d/force_reset_sync"
+		 minor(st.st_rdev), gt);
+	system(reset_string);
+}
diff --git a/lib/xe/xe_ioctl.h b/lib/xe/xe_ioctl.h
index 4d08402e0b..b27c0053f0 100644
--- a/lib/xe/xe_ioctl.h
+++ b/lib/xe/xe_ioctl.h
@@ -91,6 +91,7 @@ int __xe_wait_ufence(int fd, uint64_t *addr, uint64_t value,
 		     uint32_t exec_queue, int64_t *timeout);
 int64_t xe_wait_ufence(int fd, uint64_t *addr, uint64_t value,
 		       uint32_t exec_queue, int64_t timeout);
-void xe_force_gt_reset(int fd, int gt);
+void xe_force_gt_reset_async(int fd, int gt);
+void xe_force_gt_reset_sync(int fd, int gt);
 
 #endif /* XE_IOCTL_H */
diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index e47c3730dd..05d63c0ba5 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -239,7 +239,7 @@ test_balancer(int fd, int gt, int class, int n_exec_queues, int n_execs,
 	}
 
 	if (flags & GT_RESET)
-		xe_force_gt_reset(fd, gt);
+		xe_force_gt_reset_async(fd, gt);
 
 	if (flags & CLOSE_FD) {
 		if (flags & CLOSE_EXEC_QUEUES) {
@@ -383,7 +383,7 @@ test_legacy_mode(int fd, struct drm_xe_engine_class_instance *eci,
 	}
 
 	if (flags & GT_RESET)
-		xe_force_gt_reset(fd, eci->gt_id);
+		xe_force_gt_reset_async(fd, eci->gt_id);
 
 	if (flags & CLOSE_FD) {
 		if (flags & CLOSE_EXEC_QUEUES) {
@@ -530,7 +530,7 @@ test_compute_mode(int fd, struct drm_xe_engine_class_instance *eci,
 	}
 
 	if (flags & GT_RESET)
-		xe_force_gt_reset(fd, eci->gt_id);
+		xe_force_gt_reset_async(fd, eci->gt_id);
 
 	if (flags & CLOSE_FD) {
 		if (flags & CLOSE_EXEC_QUEUES) {
@@ -590,7 +590,7 @@ static void do_resets(struct gt_thread_data *t)
 	while (!*(t->exit)) {
 		usleep(250000);	/* 250 ms */
 		(*t->num_reset)++;
-		xe_force_gt_reset(t->fd, t->gt);
+		xe_force_gt_reset_async(t->fd, t->gt);
 	}
 }
 
diff --git a/tests/intel/xe_gt_freq.c b/tests/intel/xe_gt_freq.c
index ff99b46a08..d2e4d1a09c 100644
--- a/tests/intel/xe_gt_freq.c
+++ b/tests/intel/xe_gt_freq.c
@@ -324,7 +324,7 @@ static void test_reset(int fd, int gt_id, int cycles)
 		igt_assert_f(get_freq(fd, gt_id, "cur") == rpn,
 			     "Failed after %d good cycles\n", i);
 
-		xe_force_gt_reset(fd, gt_id);
+		xe_force_gt_reset_async(fd, gt_id);
 
 		igt_assert_f(get_freq(fd, gt_id, "min") == rpn,
 			     "Failed after %d good cycles\n", i);
diff --git a/tests/intel/xe_wedged.c b/tests/intel/xe_wedged.c
index aa4a452bfc..a4fc53869e 100644
--- a/tests/intel/xe_wedged.c
+++ b/tests/intel/xe_wedged.c
@@ -31,7 +31,7 @@ static void force_wedged(int fd)
 	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
 	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
 
-	xe_force_gt_reset(fd, 0);
+	xe_force_gt_reset_async(fd, 0);
 	sleep(1);
 }
 
-- 
2.25.1