[PATCH v5 1/4] drm/xe/lrc: Add xe lrc ring tail function definitions

[Jonathan Cavitt <jonathan.cavitt@intel.com>]

Add defintions for the functions xe_lrc_set_ring_tail and
xe_lrc_ring_tail to match the definitions for xe_lrc_set_ring_head and
xe_lrc_ring_head, respectively, except tarting the lrc tail.

Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
CC: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
CC: Brian Welty <brian.welty@intel.com>
CC: Matt Roper <matthew.d.roper@intel.com>
---
 drivers/gpu/drm/xe/xe_lrc.c | 10 ++++++++++
 drivers/gpu/drm/xe/xe_lrc.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_lrc.c b/drivers/gpu/drm/xe/xe_lrc.c
index 615bbc372ac62..e91ecbcceba5c 100644
--- a/drivers/gpu/drm/xe/xe_lrc.c
+++ b/drivers/gpu/drm/xe/xe_lrc.c
@@ -834,6 +834,16 @@ void xe_lrc_finish(struct xe_lrc *lrc)
 	xe_bo_put(lrc->bo);
 }
 
+void xe_lrc_set_ring_tail(struct xe_lrc *lrc, u32 tail)
+{
+	xe_lrc_write_ctx_reg(lrc, CTX_RING_TAIL, tail);
+}
+
+u32 xe_lrc_ring_tail(struct xe_lrc *lrc)
+{
+	return xe_lrc_read_ctx_reg(lrc, CTX_RING_TAIL) & TAIL_ADDR;
+}
+
 void xe_lrc_set_ring_head(struct xe_lrc *lrc, u32 head)
 {
 	xe_lrc_write_ctx_reg(lrc, CTX_RING_HEAD, head);
diff --git a/drivers/gpu/drm/xe/xe_lrc.h b/drivers/gpu/drm/xe/xe_lrc.h
index d32fa31faa2cf..f355b0eeb5658 100644
--- a/drivers/gpu/drm/xe/xe_lrc.h
+++ b/drivers/gpu/drm/xe/xe_lrc.h
@@ -24,6 +24,8 @@ void xe_lrc_finish(struct xe_lrc *lrc);
 size_t xe_lrc_size(struct xe_device *xe, enum xe_engine_class class);
 u32 xe_lrc_pphwsp_offset(struct xe_lrc *lrc);
 
+void xe_lrc_set_ring_tail(struct xe_lrc *lrc, u32 tail);
+u32 xe_lrc_ring_tail(struct xe_lrc *lrc);
 void xe_lrc_set_ring_head(struct xe_lrc *lrc, u32 head);
 u32 xe_lrc_ring_head(struct xe_lrc *lrc);
 u32 xe_lrc_ring_space(struct xe_lrc *lrc);
-- 
2.25.1