[Intel-gfx] [PATCH] drm/i915/gt: Make the CTX_TIMESTAMP readable on !rcs

[Chris Wilson]

For reasons that be, the HW only allows usersace to read its own
CTX_TIMESTAMP [context local HW runtime] on rcs. Make it available for
all by adding it to the whitelists.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
This probably means the change occurred in the glk/cfl timeframe...
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 94d66a9d760d..7afe5792d68c 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1253,9 +1253,15 @@ static void icl_whitelist_build(struct intel_engine_cs *engine)
 		/* hucStatus2RegOffset */
 		whitelist_reg_ext(w, _MMIO(0x23B0 + engine->mmio_base),
 				  RING_FORCE_TO_NONPRIV_ACCESS_RD);
+		whitelist_reg_ext(w,
+				  RING_CTX_TIMESTAMP(engine->mmio_base),
+				  RING_FORCE_TO_NONPRIV_ACCESS_RD);
 		break;
 
 	default:
+		whitelist_reg_ext(w,
+				  RING_CTX_TIMESTAMP(engine->mmio_base),
+				  RING_FORCE_TO_NONPRIV_ACCESS_RD);
 		break;
 	}
 }
@@ -1287,6 +1293,9 @@ static void tgl_whitelist_build(struct intel_engine_cs *engine)
 		whitelist_reg(w, HIZ_CHICKEN);
 		break;
 	default:
+		whitelist_reg_ext(w,
+				  RING_CTX_TIMESTAMP(engine->mmio_base),
+				  RING_FORCE_TO_NONPRIV_ACCESS_RD);
 		break;
 	}
 }
-- 
2.20.1