[PATCH v4 3/3] drm/xe: Cache hwe used for timestamp

[Lucas De Marchi]

Cache the hwe used to read the timestamp so it doesn't need to be done
every time it's read.

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/xe_device.c       |  2 ++
 drivers/gpu/drm/xe/xe_device_types.h |  5 +++++
 drivers/gpu/drm/xe/xe_drm_client.c   | 10 ++++++++++
 drivers/gpu/drm/xe/xe_drm_client.h   |  2 ++
 4 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index 0e2dd691bdae9..9668a60e3aeae 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -759,6 +759,8 @@ int xe_device_probe(struct xe_device *xe)
 	for_each_gt(gt, xe, id)
 		xe_gt_sanitize_freq(gt);
 
+	xe_drm_client_init(xe);
+
 	return devm_add_action_or_reset(xe->drm.dev, xe_device_sanitize, xe);
 
 err_fini_display:
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index fffbb7d1c40b4..f13b738ce77a8 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -34,6 +34,7 @@
 
 struct xe_ggtt;
 struct xe_pat_ops;
+struct xe_hw_engine;
 
 #define XE_BO_INVALID_OFFSET	LONG_MAX
 
@@ -509,6 +510,10 @@ struct xe_device {
 		int mode;
 	} wedged;
 
+	struct {
+		struct xe_hw_engine *hwe;
+	} drm_client;
+
 #ifdef TEST_VM_OPS_ERROR
 	/**
 	 * @vm_inject_error_position: inject errors at different places in VM
diff --git a/drivers/gpu/drm/xe/xe_drm_client.c b/drivers/gpu/drm/xe/xe_drm_client.c
index 298a587da7f17..125ee18ab9f1f 100644
--- a/drivers/gpu/drm/xe/xe_drm_client.c
+++ b/drivers/gpu/drm/xe/xe_drm_client.c
@@ -274,6 +274,9 @@ static struct xe_hw_engine *any_engine(struct xe_device *xe)
 	struct xe_gt *gt;
 	unsigned long gt_id;
 
+	if (xe->drm_client.hwe)
+		return xe->drm_client.hwe;
+
 	for_each_gt(gt, xe, gt_id) {
 		struct xe_hw_engine *hwe = xe_gt_any_hw_engine(gt);
 
@@ -394,4 +397,11 @@ void xe_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
 	show_meminfo(p, file);
 	show_run_ticks(p, file);
 }
+
+void xe_drm_client_init(struct xe_device *xe)
+{
+	xe->drm_client.hwe = NULL;
+	xe->drm_client.hwe = any_engine(xe);
+}
+
 #endif
diff --git a/drivers/gpu/drm/xe/xe_drm_client.h b/drivers/gpu/drm/xe/xe_drm_client.h
index a9649aa360110..5609fbd682650 100644
--- a/drivers/gpu/drm/xe/xe_drm_client.h
+++ b/drivers/gpu/drm/xe/xe_drm_client.h
@@ -16,6 +16,7 @@
 struct drm_file;
 struct drm_printer;
 struct xe_bo;
+struct xe_device;
 
 struct xe_drm_client {
 	struct kref kref;
@@ -48,6 +49,7 @@ static inline void xe_drm_client_put(struct xe_drm_client *client)
 	kref_put(&client->kref, __xe_drm_client_free);
 }
 
+void xe_drm_client_init(struct xe_device *xe);
 struct xe_drm_client *xe_drm_client_alloc(void);
 static inline struct xe_drm_client *
 xe_drm_client_get(struct xe_drm_client *client);
-- 
2.47.0