[PATCH i-g-t v4 1/3] lib/xe/xe_spin: Introduce xe_spin_reset

[Soham Purkait <soham.purkait@intel.com>]

Create new function xe_spin_reset()
This function resets the state of spin, allowing
its reuse for engine activity accuracy test.

v1:
 - Add simple commit message and mention test where it is going to be
   used. (kamil)
v2:
 - Add fd description for xe_spin_reset. (Kamil)

Signed-off-by: Soham Purkait <soham.purkait@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
---
 lib/xe/xe_spin.c | 29 +++++++++++++++++++++++++++++
 lib/xe/xe_spin.h |  1 +
 2 files changed, 30 insertions(+)

diff --git a/lib/xe/xe_spin.c b/lib/xe/xe_spin.c
index ff19128b6..ad55293f5 100644
--- a/lib/xe/xe_spin.c
+++ b/lib/xe/xe_spin.c
@@ -205,6 +205,35 @@ void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts)
 	igt_assert(b <= ARRAY_SIZE(spin->batch));
 }
 
+/**
+ * xe_spin_reset:
+ * @fd: xe device file descriptor
+ * @spin: spin state from xe_spin_new()
+ *
+ * Reset the state of spin, allowing its reuse.
+ */
+void xe_spin_reset(int fd, igt_spin_t *spin)
+{
+	struct drm_xe_sync sync = {
+		.type = DRM_XE_SYNC_TYPE_SYNCOBJ,
+		.flags = DRM_XE_SYNC_FLAG_SIGNAL,
+		.handle = spin->syncobj,
+	};
+	struct drm_xe_exec exec = {
+		.num_batch_buffer = 1,
+		.num_syncs = 1,
+		.syncs = to_user_pointer(&sync),
+		.exec_queue_id = spin->engine,
+		.address = spin->address,
+	};
+
+	xe_spin_init_opts((struct xe_spin *)spin->xe_spin,
+			  .addr = spin->address,
+			  .preempt = !(spin->opts.flags & IGT_SPIN_NO_PREEMPTION));
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_XE_EXEC, &exec), 0);
+	xe_spin_wait_started((struct xe_spin *)spin->xe_spin);
+}
+
 /**
  * xe_spin_started:
  * @spin: pointer to spinner mapped bo
diff --git a/lib/xe/xe_spin.h b/lib/xe/xe_spin.h
index 5c7566423..5dfe05cb5 100644
--- a/lib/xe/xe_spin.h
+++ b/lib/xe/xe_spin.h
@@ -77,6 +77,7 @@ uint32_t xe_spin_nsec_to_ticks(int fd, int gt_id, uint64_t nsec);
 void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts);
 #define xe_spin_init_opts(fd, ...) \
 	xe_spin_init(fd, &((struct xe_spin_opts){__VA_ARGS__}))
+void xe_spin_reset(int fd, igt_spin_t *spin);
 bool xe_spin_started(struct xe_spin *spin);
 void xe_spin_wait_started(struct xe_spin *spin);
 void xe_spin_end(struct xe_spin *spin);
-- 
2.34.1