[PATCH v2 9/9] drm/xe/multi_queue: Whitelist QUEUE_TIMESTAMP register

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

In a multi-queue use case, when a job is running on the secondary queue,
the CTX_TIMESTAMP does not reflect the queues run ticks. Instead, we use
the QUEUE TIMESTAMP to check how long the job ran. For user space to see
the run ticks for a secondary queue, whitelist the QUEUE_TIMESTAMP
register.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
v2: Whitelist QUEUE_TIMESTAMP only for copy and compute engines (Niranjana)
---
 drivers/gpu/drm/xe/xe_reg_whitelist.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index 80577e4b7437..37d6ac720d5c 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -33,6 +33,14 @@ static bool match_has_mert(const struct xe_device *xe,
 	return xe_device_has_mert((struct xe_device *)xe);
 }
 
+static bool match_multiq_class(const struct xe_device *xe,
+			       const struct xe_gt *gt,
+			       const struct xe_hw_engine *hwe)
+{
+	return hwe->class == XE_ENGINE_CLASS_COMPUTE ||
+	       hwe->class == XE_ENGINE_CLASS_COPY;
+}
+
 static const struct xe_rtp_entry_sr register_whitelist[] = {
 	{ XE_RTP_NAME("WaAllowPMDepthAndInvocationCountAccessFromUMD, 1408556865"),
 	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210), ENGINE_CLASS(RENDER)),
@@ -54,6 +62,12 @@ static const struct xe_rtp_entry_sr register_whitelist[] = {
 				RING_FORCE_TO_NONPRIV_ACCESS_RD,
 				XE_RTP_ACTION_FLAG(ENGINE_BASE)))
 	},
+	{ XE_RTP_NAME("allow_read_queue_timestamp"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(3500, 3511), FUNC(match_multiq_class)),
+	  XE_RTP_ACTIONS(WHITELIST(RING_QUEUE_TIMESTAMP(0),
+				   RING_FORCE_TO_NONPRIV_ACCESS_RD,
+				   XE_RTP_ACTION_FLAG(ENGINE_BASE)))
+	},
 	{ XE_RTP_NAME("16014440446"),
 	  XE_RTP_RULES(PLATFORM(PVC)),
 	  XE_RTP_ACTIONS(WHITELIST(XE_REG(0x4400),
-- 
2.43.0