linux-kernel - [PATCH v3 07/15] drm/msm/gem: Consolidate pin/unpin paths

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Date:   Tue, 26 Jul 2022 10:50:31 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 07/15] drm/msm/gem: Consolidate pin/unpin paths

From: Rob Clark <robdclark@...omium.org>

Avoid having multiple spots where we increment/decrement pin_count (and
associated LRU updating)

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 3da64c7f65a2..407b18a24dc4 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -190,7 +190,7 @@ static struct page **msm_gem_pin_pages_locked(struct drm_gem_object *obj)
 
 	p = get_pages(obj);
 	if (!IS_ERR(p)) {
-		msm_obj->pin_count++;
+		to_msm_bo(obj)->pin_count++;
 		update_lru(obj);
 	}
 
@@ -213,9 +213,7 @@ void msm_gem_unpin_pages(struct drm_gem_object *obj)
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
 	msm_gem_lock(obj);
-	msm_obj->pin_count--;
-	GEM_WARN_ON(msm_obj->pin_count < 0);
-	update_lru(obj);
+	msm_gem_unpin_locked(obj);
 	msm_gem_unlock(obj);
 }
 
@@ -436,14 +434,13 @@ int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct msm_gem_vma *vma)
 	if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED))
 		return -EBUSY;
 
-	pages = get_pages(obj);
+	pages = msm_gem_pin_pages_locked(obj);
 	if (IS_ERR(pages))
 		return PTR_ERR(pages);
 
 	ret = msm_gem_map_vma(vma->aspace, vma, prot, msm_obj->sgt, obj->size);
-
-	if (!ret)
-		msm_obj->pin_count++;
+	if (ret)
+		msm_gem_unpin_locked(obj);
 
 	return ret;
 }
-- 
2.36.1