[PATCH i-g-t 2/3] lib/xe/xe_spin: Add support to store/write timestamp

[sai.gowtham.ch at intel.com]

From: Sai Gowtham Ch <sai.gowtham.ch at intel.com>

Store timestamp on demand in the spinner to allow user code verify
is it still running.

Cc: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Signed-off-by: Sai Gowtham Ch <sai.gowtham.ch at intel.com>
Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
---
 lib/xe/xe_spin.c | 12 ++++++++++++
 lib/xe/xe_spin.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/lib/xe/xe_spin.c b/lib/xe/xe_spin.c
index 1ca54ea19..2c9b5848a 100644
--- a/lib/xe/xe_spin.c
+++ b/lib/xe/xe_spin.c
@@ -72,6 +72,7 @@ void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts)
 	uint64_t end_addr = opts->addr + offsetof(struct xe_spin, end);
 	uint64_t ticks_delta_addr = opts->addr + offsetof(struct xe_spin, ticks_delta);
 	uint64_t pad_addr = opts->addr + offsetof(struct xe_spin, pad);
+	uint64_t timestamp_addr = opts->addr + offsetof(struct xe_spin, timestamp);
 	int b = 0;
 
 	spin->start = 0;
@@ -98,6 +99,17 @@ void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts)
 	if (opts->preempt)
 		spin->batch[b++] = (0x5 << 23);
 
+	if (opts->write_timestamp) {
+		spin->batch[b++] = MI_LOAD_REGISTER_REG | MI_LRR_DST_CS_MMIO | MI_LRR_SRC_CS_MMIO;
+		spin->batch[b++] = CTX_TIMESTAMP;
+		spin->batch[b++] = CS_GPR(NOW_TS);
+
+		spin->batch[b++] = MI_STORE_REGISTER_MEM_GEN8 | MI_SRM_CS_MMIO;
+		spin->batch[b++] = CS_GPR(NOW_TS);
+		spin->batch[b++] = timestamp_addr;
+		spin->batch[b++] = timestamp_addr >> 32;
+	}
+
 	if (opts->ctx_ticks) {
 		spin->batch[b++] = MI_LOAD_REGISTER_IMM(1) | MI_LRI_CS_MMIO;
 		spin->batch[b++] = CS_GPR(NOW_TS) + 4;
diff --git a/lib/xe/xe_spin.h b/lib/xe/xe_spin.h
index 87b7c1716..d65adb05c 100644
--- a/lib/xe/xe_spin.h
+++ b/lib/xe/xe_spin.h
@@ -29,6 +29,7 @@ struct xe_spin_opts {
 	uint64_t addr;
 	bool preempt;
 	uint32_t ctx_ticks;
+	bool write_timestamp;
 };
 
 /* Mapped GPU object */
@@ -39,6 +40,7 @@ struct xe_spin {
 	uint32_t end;
 	uint32_t ticks_delta;
 	uint64_t exec_sync;
+	uint32_t timestamp;
 };
 
 igt_spin_t *xe_spin_create(int fd, const struct igt_spin_factory *opt);
-- 
2.39.1