linux-kernel - [PATCH v3 04/15] drm/msm/gem: Check for active in shrinker path

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Message-Id: <20220726175043.1027731-5-robdclark@gmail.com>
Date:   Tue, 26 Jul 2022 10:50:28 -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 04/15] drm/msm/gem: Check for active in shrinker path

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

Currently in our shrinker path we shouldn't be encountering anything
that is active, but this will change in subsequent patches.  So check
if there are unsignaled fences.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c          | 10 ++++++++++
 drivers/gpu/drm/msm/msm_gem.h          |  1 +
 drivers/gpu/drm/msm/msm_gem_shrinker.c |  6 ++++++
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 8ddbd2e001d4..b55d252aef17 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -870,6 +870,16 @@ static void update_inactive(struct msm_gem_object *msm_obj)
 	mutex_unlock(&priv->mm_lock);
 }
 
+bool msm_gem_active(struct drm_gem_object *obj)
+{
+	GEM_WARN_ON(!msm_gem_is_locked(obj));
+
+	if (to_msm_bo(obj)->pin_count)
+		return true;
+
+	return !dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true));
+}
+
 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
 {
 	bool write = !!(op & MSM_PREP_WRITE);
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 432032ad4aed..0ab0dc4f8c25 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -173,6 +173,7 @@ void msm_gem_put_vaddr(struct drm_gem_object *obj);
 int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv);
 void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu);
 void msm_gem_active_put(struct drm_gem_object *obj);
+bool msm_gem_active(struct drm_gem_object *obj);
 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout);
 int msm_gem_cpu_fini(struct drm_gem_object *obj);
 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
index 6e39d959b9f0..ea8ed74982c1 100644
--- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
+++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
@@ -43,6 +43,9 @@ purge(struct msm_gem_object *msm_obj)
 	if (!is_purgeable(msm_obj))
 		return false;
 
+	if (msm_gem_active(&msm_obj->base))
+		return false;
+
 	/*
 	 * This will move the obj out of still_in_list to
 	 * the purged list
@@ -58,6 +61,9 @@ evict(struct msm_gem_object *msm_obj)
 	if (is_unevictable(msm_obj))
 		return false;
 
+	if (msm_gem_active(&msm_obj->base))
+		return false;
+
 	msm_gem_evict(&msm_obj->base);
 
 	return true;
-- 
2.36.1