linux-kernel - [PATCH 5.7 139/166] drm/i915/gt: Pin the rings before marking active

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Date:   Tue, 14 Jul 2020 20:45:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 5.7 139/166] drm/i915/gt: Pin the rings before marking active

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 5a383d443b29a140094430f3ad1d02fa1acc2b80 upstream.

On eviction, we acquire the vm->mutex and then wait on the vma->active.
Therefore when binding and pinning the vma, we must follow the same
sequence, lock/pin the vma then mark it active. Otherwise, we mark the
vma as active, then wait for the vm->mutex, and meanwhile the evictor
holding the mutex waits upon us to complete our activity.

Fixes: 8ccfc20a7d56 ("drm/i915/gt: Mark ring->vma as active while pinned")
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: <stable@...r.kernel.org> # v5.6+
Reviewed-by: Matthew Auld <matthew.auld@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200706170138.8993-1-chris@chris-wilson.co.uk
(cherry picked from commit 8567774e87e23a57155e5102f81208729b992ae6)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/gt/intel_context.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -201,25 +201,25 @@ static int __ring_active(struct intel_ri
 {
 	int err;
 
-	err = i915_active_acquire(&ring->vma->active);
+	err = intel_ring_pin(ring);
 	if (err)
 		return err;
 
-	err = intel_ring_pin(ring);
+	err = i915_active_acquire(&ring->vma->active);
 	if (err)
-		goto err_active;
+		goto err_pin;
 
 	return 0;
 
-err_active:
-	i915_active_release(&ring->vma->active);
+err_pin:
+	intel_ring_unpin(ring);
 	return err;
 }
 
 static void __ring_retire(struct intel_ring *ring)
 {
-	intel_ring_unpin(ring);
 	i915_active_release(&ring->vma->active);
+	intel_ring_unpin(ring);
 }
 
 __i915_active_call