From 8b31589f135858ffed69a9bf0f7c53160e254736 Mon Sep 17 00:00:00 2001
From: Matthew Brost <matthew.brost@intel.com>
Date: Thu, 8 Jul 2021 09:20:49 -0700
Subject: drm/i915/guc: Relax CTB response timeout
Git-commit: 1ccf7294b76d28d5151f024351c747ccf101d66e
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
In upcoming patch we will allow more CTB requests to be sent in
parallel to the GuC for processing, so we shouldn't assume any more
that GuC will always reply without 10ms.
Use bigger value hardcoded value of 1s instead.
v2: Add CONFIG_DRM_I915_GUC_CTB_TIMEOUT config option
v3:
(Daniel Vetter)
- Use hardcoded value of 1s rather than config option
v4:
(Michal)
- Use defines for timeout values
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708162055.129996-2-matthew.brost@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
index 43409044528e..b86575b99537 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -474,14 +474,18 @@ static int wait_for_ct_request_update(struct ct_request *req, u32 *status)
/*
* Fast commands should complete in less than 10us, so sample quickly
* up to that length of time, then switch to a slower sleep-wait loop.
- * No GuC command should ever take longer than 10ms.
+ * No GuC command should ever take longer than 10ms but many GuC
+ * commands can be inflight at time, so use a 1s timeout on the slower
+ * sleep-wait loop.
*/
+#define GUC_CTB_RESPONSE_TIMEOUT_SHORT_MS 10
+#define GUC_CTB_RESPONSE_TIMEOUT_LONG_MS 1000
#define done \
(FIELD_GET(GUC_HXG_MSG_0_ORIGIN, READ_ONCE(req->status)) == \
GUC_HXG_ORIGIN_GUC)
- err = wait_for_us(done, 10);
+ err = wait_for_us(done, GUC_CTB_RESPONSE_TIMEOUT_SHORT_MS);
if (err)
- err = wait_for(done, 10);
+ err = wait_for(done, GUC_CTB_RESPONSE_TIMEOUT_LONG_MS);
#undef done
if (unlikely(err))
--
2.38.1