[PATCH] drm/xe/xe2: Enable Priority Mem Read

[Pallavi Mishra]

Enable feature to allow memory reads to take a
priority memory path. This will reduce latency
on the read path, but may introduce RAW hazards.

Bspec: 45845, 60237, 60187, 60188

Signed-off-by: Pallavi Mishra <pallavi.mishra at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_engine_regs.h | 1 +
 drivers/gpu/drm/xe/xe_hw_engine.c        | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/xe/regs/xe_engine_regs.h b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
index 263ffc7bc2ef..4e8f9a61f0bf 100644
--- a/drivers/gpu/drm/xe/regs/xe_engine_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_engine_regs.h
@@ -104,6 +104,7 @@
 #define CSFE_CHICKEN1(base)			XE_REG((base) + 0xd4, XE_REG_OPTION_MASKED)
 #define   GHWSP_CSB_REPORT_DIS			REG_BIT(15)
 #define   PPHWSP_CSB_AND_TIMESTAMP_REPORT_DIS	REG_BIT(14)
+#define   CS_PRIORITY_MEM_READ			REG_BIT(7)
 
 #define FF_SLICE_CS_CHICKEN1(base)		XE_REG((base) + 0xe0, XE_REG_OPTION_MASKED)
 #define   FFSC_PERCTX_PREEMPT_CTRL		REG_BIT(14)
diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c
index de1aefaa2335..34aa8b5270b0 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine.c
@@ -424,6 +424,13 @@ hw_engine_setup_default_state(struct xe_hw_engine *hwe)
 					   0xA,
 					   XE_RTP_ACTION_FLAG(ENGINE_BASE)))
 		},
+		/* Enable Priority Mem Read */
+		{ XE_RTP_NAME("Priority_Mem_Read"),
+		  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(2000, 2004)),
+		  XE_RTP_ACTIONS(SET(CSFE_CHICKEN1(0),
+				     CS_PRIORITY_MEM_READ)),
+		  XE_RTP_ACTION_FLAG(ENGINE_BASE),
+		},
 		{}
 	};
 
-- 
2.25.1