linux-kernel - [PATCH 5.15 865/917] drm/i915/guc: Fix blocked context accounting

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Date:   Mon, 15 Nov 2021 18:06:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthew Brost <matthew.brost@...el.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        John Harrison <John.C.Harrison@...el.com>
Subject: [PATCH 5.15 865/917] drm/i915/guc: Fix blocked context accounting

From: Matthew Brost <matthew.brost@...el.com>

commit fc30a6764a54dea42291aeb7009bef7aa2fc1cd4 upstream.

Prior to this patch the blocked context counter was cleared on
init_sched_state (used during registering a context & resets) which is
incorrect. This state needs to be persistent or the counter can read the
incorrect value resulting in scheduling never getting enabled again.

Fixes: 62eaf0ae217d ("drm/i915/guc: Support request cancellation")
Signed-off-by: Matthew Brost <matthew.brost@...el.com>
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: <stable@...r.kernel.org>
Signed-off-by: John Harrison <John.C.Harrison@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210909164744.31249-2-matthew.brost@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -152,7 +152,7 @@ static inline void init_sched_state(stru
 {
 	/* Only should be called from guc_lrc_desc_pin() */
 	atomic_set(&ce->guc_sched_state_no_lock, 0);
-	ce->guc_state.sched_state = 0;
+	ce->guc_state.sched_state &= SCHED_STATE_BLOCKED_MASK;
 }
 
 static inline bool