linux-kernel - [PATCH 1/4] drm/msm: Take lru lock once per job

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Message-ID: <20230802222158.11838-2-robdclark@gmail.com>
Date:   Wed,  2 Aug 2023 15:21:49 -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>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/4] drm/msm: Take lru lock once per job_run

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

Rather than acquiring it and dropping it for each individual obj.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c        | 3 ---
 drivers/gpu/drm/msm/msm_ringbuffer.c | 5 +++++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 20cfd86d2b32..6d1dbffc3905 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -509,14 +509,11 @@ void msm_gem_unpin_locked(struct drm_gem_object *obj)
  */
 void msm_gem_unpin_active(struct drm_gem_object *obj)
 {
-	struct msm_drm_private *priv = obj->dev->dev_private;
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
-	mutex_lock(&priv->lru.lock);
 	msm_obj->pin_count--;
 	GEM_WARN_ON(msm_obj->pin_count < 0);
 	update_lru_active(obj);
-	mutex_unlock(&priv->lru.lock);
 }
 
 struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj,
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
index b60199184409..8b8353dcde9f 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.c
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -16,10 +16,13 @@ static struct dma_fence *msm_job_run(struct drm_sched_job *job)
 	struct msm_gem_submit *submit = to_msm_submit(job);
 	struct msm_fence_context *fctx = submit->ring->fctx;
 	struct msm_gpu *gpu = submit->gpu;
+	struct msm_drm_private *priv = gpu->dev->dev_private;
 	int i;
 
 	msm_fence_init(submit->hw_fence, fctx);
 
+	mutex_lock(&priv->lru.lock);
+
 	for (i = 0; i < submit->nr_bos; i++) {
 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
 
@@ -28,6 +31,8 @@ static struct dma_fence *msm_job_run(struct drm_sched_job *job)
 		submit->bos[i].flags &= ~(BO_VMA_PINNED | BO_OBJ_PINNED);
 	}
 
+	mutex_unlock(&priv->lru.lock);
+
 	/* TODO move submit path over to using a per-ring lock.. */
 	mutex_lock(&gpu->lock);
 
-- 
2.41.0