[RFC PATCH 1/5] drm/xe: Add LRC ctx timestamp support functions

[Matthew Brost <matthew.brost@intel.com>]

LRC ctx timestamp support functions are used to determine how long a job
has run on the hardware.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_lrc.c | 42 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_lrc.h |  5 +++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_lrc.c b/drivers/gpu/drm/xe/xe_lrc.c
index c1bb85d2e243..76d61b5d5cb6 100644
--- a/drivers/gpu/drm/xe/xe_lrc.c
+++ b/drivers/gpu/drm/xe/xe_lrc.c
@@ -652,6 +652,7 @@ u32 xe_lrc_pphwsp_offset(struct xe_lrc *lrc)
 
 #define LRC_SEQNO_PPHWSP_OFFSET 512
 #define LRC_START_SEQNO_PPHWSP_OFFSET (LRC_SEQNO_PPHWSP_OFFSET + 8)
+#define LRC_CTX_TIMESTAMP_JOB_OFFSET (LRC_START_SEQNO_PPHWSP_OFFSET + 8)
 #define LRC_PARALLEL_PPHWSP_OFFSET 2048
 #define LRC_PPHWSP_SIZE SZ_4K
 
@@ -680,6 +681,12 @@ static inline u32 __xe_lrc_start_seqno_offset(struct xe_lrc *lrc)
 	return xe_lrc_pphwsp_offset(lrc) + LRC_START_SEQNO_PPHWSP_OFFSET;
 }
 
+static inline u32 __xe_lrc_ctx_timestamp_job_offset(struct xe_lrc *lrc)
+{
+	/* The start seqno is stored in the driver-defined portion of PPHWSP */
+	return xe_lrc_pphwsp_offset(lrc) + LRC_CTX_TIMESTAMP_JOB_OFFSET;
+}
+
 static inline u32 __xe_lrc_parallel_offset(struct xe_lrc *lrc)
 {
 	/* The parallel is stored in the driver-defined portion of PPHWSP */
@@ -691,6 +698,11 @@ static inline u32 __xe_lrc_regs_offset(struct xe_lrc *lrc)
 	return xe_lrc_pphwsp_offset(lrc) + LRC_PPHWSP_SIZE;
 }
 
+static inline u32 __xe_lrc_ctx_timestamp_offset(struct xe_lrc *lrc)
+{
+	return __xe_lrc_regs_offset(lrc) + CTX_TIMESTAMP * sizeof(u32);
+}
+
 static inline u32 __xe_lrc_indirect_ring_offset(struct xe_lrc *lrc)
 {
 	/* Indirect ring state page is at the very end of LRC */
@@ -716,11 +728,41 @@ DECL_MAP_ADDR_HELPERS(pphwsp)
 DECL_MAP_ADDR_HELPERS(seqno)
 DECL_MAP_ADDR_HELPERS(regs)
 DECL_MAP_ADDR_HELPERS(start_seqno)
+DECL_MAP_ADDR_HELPERS(ctx_timestamp_job)
+DECL_MAP_ADDR_HELPERS(ctx_timestamp)
 DECL_MAP_ADDR_HELPERS(parallel)
 DECL_MAP_ADDR_HELPERS(indirect_ring)
 
 #undef DECL_MAP_ADDR_HELPERS
 
+u32 xe_lrc_ctx_timestamp_ggtt_addr(struct xe_lrc *lrc)
+{
+	return __xe_lrc_ctx_timestamp_ggtt_addr(lrc);
+}
+
+u32 xe_lrc_ctx_timestamp(struct xe_lrc *lrc)
+{
+	struct xe_device *xe = lrc_to_xe(lrc);
+	struct iosys_map map;
+
+	map = __xe_lrc_ctx_timestamp_map(lrc);
+	return xe_map_read32(xe, &map);
+}
+
+u32 xe_lrc_ctx_timestamp_job_ggtt_addr(struct xe_lrc *lrc)
+{
+	return __xe_lrc_ctx_timestamp_job_ggtt_addr(lrc);
+}
+
+u32 xe_lrc_ctx_timestamp_job(struct xe_lrc *lrc)
+{
+	struct xe_device *xe = lrc_to_xe(lrc);
+	struct iosys_map map;
+
+	map = __xe_lrc_ctx_timestamp_job_map(lrc);
+	return xe_map_read32(xe, &map);
+}
+
 u32 xe_lrc_ggtt_addr(struct xe_lrc *lrc)
 {
 	return __xe_lrc_pphwsp_ggtt_addr(lrc);
diff --git a/drivers/gpu/drm/xe/xe_lrc.h b/drivers/gpu/drm/xe/xe_lrc.h
index 882c3437ba5c..391ea47ff0fb 100644
--- a/drivers/gpu/drm/xe/xe_lrc.h
+++ b/drivers/gpu/drm/xe/xe_lrc.h
@@ -94,6 +94,11 @@ void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot);
 void xe_lrc_snapshot_print(struct xe_lrc_snapshot *snapshot, struct drm_printer *p);
 void xe_lrc_snapshot_free(struct xe_lrc_snapshot *snapshot);
 
+u32 xe_lrc_ctx_timestamp_ggtt_addr(struct xe_lrc *lrc);
+u32 xe_lrc_ctx_timestamp(struct xe_lrc *lrc);
+u32 xe_lrc_ctx_timestamp_job_ggtt_addr(struct xe_lrc *lrc);
+u32 xe_lrc_ctx_timestamp_job(struct xe_lrc *lrc);
+
 /**
  * xe_lrc_update_timestamp - readout LRC timestamp and update cached value
  * @lrc: logical ring context for this exec queue
-- 
2.34.1