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[73.25.156.94]) by smtp.gmail.com with ESMTPSA id x18sm18492725pfj.90.2020.10.11.19.09.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Oct 2020 19:09:13 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Daniel Vetter , Rob Clark , Jordan Crouse , Rob Clark , Sean Paul , David Airlie , linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU), freedreno@lists.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO GPU), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 12/22] drm/msm: Add priv->mm_lock to protect active/inactive lists Date: Sun, 11 Oct 2020 19:09:39 -0700 Message-Id: <20201012020958.229288-13-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201012020958.229288-1-robdclark@gmail.com> References: <20201012020958.229288-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark Rather than relying on the big dev->struct_mutex hammer, introduce a more specific lock for protecting the bo lists. Signed-off-by: Rob Clark Reviewed-by: Jordan Crouse --- drivers/gpu/drm/msm/msm_debugfs.c | 7 +++++++ drivers/gpu/drm/msm/msm_drv.c | 7 +++++++ drivers/gpu/drm/msm/msm_drv.h | 13 +++++++++++- drivers/gpu/drm/msm/msm_gem.c | 28 +++++++++++++++----------- drivers/gpu/drm/msm/msm_gem_shrinker.c | 12 +++++++++++ drivers/gpu/drm/msm/msm_gpu.h | 5 ++++- 6 files changed, 58 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_debugfs.c b/drivers/gpu/drm/msm/msm_debugfs.c index ee2e270f464c..64afbed89821 100644 --- a/drivers/gpu/drm/msm/msm_debugfs.c +++ b/drivers/gpu/drm/msm/msm_debugfs.c @@ -112,6 +112,11 @@ static int msm_gem_show(struct drm_device *dev, struct seq_file *m) { struct msm_drm_private *priv = dev->dev_private; struct msm_gpu *gpu = priv->gpu; + int ret; + + ret = mutex_lock_interruptible(&priv->mm_lock); + if (ret) + return ret; if (gpu) { seq_printf(m, "Active Objects (%s):\n", gpu->name); @@ -121,6 +126,8 @@ static int msm_gem_show(struct drm_device *dev, struct seq_file *m) seq_printf(m, "Inactive Objects:\n"); msm_gem_describe_objects(&priv->inactive_list, m); + mutex_unlock(&priv->mm_lock); + return 0; } diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 49685571dc0e..81cb2cecc829 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -7,6 +7,7 @@ #include #include +#include #include #include @@ -441,6 +442,12 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv) init_llist_head(&priv->free_list); INIT_LIST_HEAD(&priv->inactive_list); + mutex_init(&priv->mm_lock); + + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&priv->mm_lock); + fs_reclaim_release(GFP_KERNEL); drm_mode_config_init(ddev); diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index 79ee7d05b363..a17dadd38685 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -174,8 +174,19 @@ struct msm_drm_private { struct msm_rd_state *hangrd; /* debugfs to dump hanging submits */ struct msm_perf_state *perf; - /* list of GEM objects: */ + /* + * List of inactive GEM objects. Every bo is either in the inactive_list + * or gpu->active_list (for the gpu it is active on[1]) + * + * These lists are protected by mm_lock. If struct_mutex is involved, it + * should be aquired prior to mm_lock. One should *not* hold mm_lock in + * get_pages()/vmap()/etc paths, as they can trigger the shrinker. + * + * [1] if someone ever added support for the old 2d cores, there could be + * more than one gpu object + */ struct list_head inactive_list; + struct mutex mm_lock; /* worker for delayed free of objects: */ struct work_struct free_work; diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 833e3d3c6e8c..15f81ed2e154 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -753,13 +753,17 @@ int msm_gem_sync_object(struct drm_gem_object *obj, void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu) { struct msm_gem_object *msm_obj = to_msm_bo(obj); - WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); + struct msm_drm_private *priv = obj->dev->dev_private; + + might_sleep(); WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED); if (!atomic_fetch_inc(&msm_obj->active_count)) { + mutex_lock(&priv->mm_lock); msm_obj->gpu = gpu; list_del_init(&msm_obj->mm_list); list_add_tail(&msm_obj->mm_list, &gpu->active_list); + mutex_unlock(&priv->mm_lock); } } @@ -768,12 +772,14 @@ void msm_gem_active_put(struct drm_gem_object *obj) struct msm_gem_object *msm_obj = to_msm_bo(obj); struct msm_drm_private *priv = obj->dev->dev_private; - WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); + might_sleep(); if (!atomic_dec_return(&msm_obj->active_count)) { + mutex_lock(&priv->mm_lock); msm_obj->gpu = NULL; list_del_init(&msm_obj->mm_list); list_add_tail(&msm_obj->mm_list, &priv->inactive_list); + mutex_unlock(&priv->mm_lock); } } @@ -928,13 +934,16 @@ static void free_object(struct msm_gem_object *msm_obj) { struct drm_gem_object *obj = &msm_obj->base; struct drm_device *dev = obj->dev; + struct msm_drm_private *priv = dev->dev_private; WARN_ON(!mutex_is_locked(&dev->struct_mutex)); /* object should not be on active list: */ WARN_ON(is_active(msm_obj)); + mutex_lock(&priv->mm_lock); list_del(&msm_obj->mm_list); + mutex_unlock(&priv->mm_lock); msm_gem_lock(obj); @@ -1108,14 +1117,9 @@ static struct drm_gem_object *_msm_gem_new(struct drm_device *dev, mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER); } - if (struct_mutex_locked) { - WARN_ON(!mutex_is_locked(&dev->struct_mutex)); - list_add_tail(&msm_obj->mm_list, &priv->inactive_list); - } else { - mutex_lock(&dev->struct_mutex); - list_add_tail(&msm_obj->mm_list, &priv->inactive_list); - mutex_unlock(&dev->struct_mutex); - } + mutex_lock(&priv->mm_lock); + list_add_tail(&msm_obj->mm_list, &priv->inactive_list); + mutex_unlock(&priv->mm_lock); return obj; @@ -1183,9 +1187,9 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev, msm_gem_unlock(obj); - mutex_lock(&dev->struct_mutex); + mutex_lock(&priv->mm_lock); list_add_tail(&msm_obj->mm_list, &priv->inactive_list); - mutex_unlock(&dev->struct_mutex); + mutex_unlock(&priv->mm_lock); return obj; diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c index 2dc0ffa925b4..6be073b8ca08 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -51,6 +51,8 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) if (!msm_gem_shrinker_lock(dev, &unlock)) return 0; + mutex_lock(&priv->mm_lock); + list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { if (!msm_gem_trylock(&msm_obj->base)) continue; @@ -59,6 +61,8 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) msm_gem_unlock(&msm_obj->base); } + mutex_unlock(&priv->mm_lock); + if (unlock) mutex_unlock(&dev->struct_mutex); @@ -78,6 +82,8 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) if (!msm_gem_shrinker_lock(dev, &unlock)) return SHRINK_STOP; + mutex_lock(&priv->mm_lock); + list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { if (freed >= sc->nr_to_scan) break; @@ -90,6 +96,8 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) msm_gem_unlock(&msm_obj->base); } + mutex_unlock(&priv->mm_lock); + if (unlock) mutex_unlock(&dev->struct_mutex); @@ -112,6 +120,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) if (!msm_gem_shrinker_lock(dev, &unlock)) return NOTIFY_DONE; + mutex_lock(&priv->mm_lock); + list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { if (!msm_gem_trylock(&msm_obj->base)) continue; @@ -129,6 +139,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) break; } + mutex_unlock(&priv->mm_lock); + if (unlock) mutex_unlock(&dev->struct_mutex); diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index 6c9e1fdc1a76..1806e87600c0 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -94,7 +94,10 @@ struct msm_gpu { struct msm_ringbuffer *rb[MSM_GPU_MAX_RINGS]; int nr_rings; - /* list of GEM active objects: */ + /* + * List of GEM active objects on this gpu. Protected by + * msm_drm_private::mm_lock + */ struct list_head active_list; /* does gpu need hw_init? */