From patchwork Sat Aug 11 14:41:27 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 1308731 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork2.kernel.org (Postfix) with ESMTP id A48DBDF2D2 for ; Sat, 11 Aug 2012 14:52:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 799A9A1141 for ; Sat, 11 Aug 2012 07:52:20 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (smtp.fireflyinternet.com [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id 9306BA1130 for ; Sat, 11 Aug 2012 07:42:19 -0700 (PDT) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.73.22; Received: from arrandale.alporthouse.com (unverified [78.156.73.22]) by fireflyinternet.com (Firefly Internet SMTP) with ESMTP id 120056256-1500050 for multiple; Sat, 11 Aug 2012 15:42:11 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Sat, 11 Aug 2012 15:41:27 +0100 Message-Id: <1344696088-24760-29-git-send-email-chris@chris-wilson.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1344696088-24760-1-git-send-email-chris@chris-wilson.co.uk> References: <1344696088-24760-1-git-send-email-chris@chris-wilson.co.uk> X-Originating-IP: 78.156.73.22 Subject: [Intel-gfx] [PATCH 28/29] drm/i915: Use a slab for object allocation X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org The primary purpose of this was to debug some use-after-free memory corruption that was causing an OOPS inside drm/i915. As it turned out the corruption was being caused elsewhere and i915.ko as a major user of many objects was being hit hardest. Indeed as we do frequent the generic kmalloc caches, dedicating one to ourselves (or at least naming one for us depending upon the core) aids debugging our own slab usage. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_dma.c | 3 +++ drivers/gpu/drm/i915/i915_drv.h | 4 ++++ drivers/gpu/drm/i915/i915_gem.c | 28 +++++++++++++++++++++++----- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 5 ++--- drivers/gpu/drm/i915/i915_gem_stolen.c | 4 ++-- 5 files changed, 34 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index df6490b..07f5b2e 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1759,6 +1759,9 @@ int i915_driver_unload(struct drm_device *dev) destroy_workqueue(dev_priv->wq); + if (dev_priv->slab) + kmem_cache_destroy(dev_priv->slab); + pci_dev_put(dev_priv->bridge_dev); kfree(dev->dev_private); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 03cd1d6..f0bf78f 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -390,6 +390,7 @@ struct intel_gmbus { typedef struct drm_i915_private { struct drm_device *dev; + struct kmem_cache *slab; const struct intel_device_info *info; @@ -1311,12 +1312,15 @@ int i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data, int i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv); void i915_gem_load(struct drm_device *dev); +void *i915_gem_object_alloc(struct drm_device *dev); +void i915_gem_object_free(struct drm_i915_gem_object *obj); int i915_gem_init_object(struct drm_gem_object *obj); void i915_gem_object_init(struct drm_i915_gem_object *obj, const struct drm_i915_gem_object_ops *ops); struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev, size_t size); void i915_gem_free_object(struct drm_gem_object *obj); + int __must_check i915_gem_object_pin(struct drm_i915_gem_object *obj, uint32_t alignment, bool map_and_fenceable, diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index df73e02..2d7adbb 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -193,6 +193,18 @@ i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data, return 0; } +void *i915_gem_object_alloc(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + return kmem_cache_alloc(dev_priv->slab, GFP_KERNEL | __GFP_ZERO); +} + +void i915_gem_object_free(struct drm_i915_gem_object *obj) +{ + struct drm_i915_private *dev_priv = obj->base.dev->dev_private; + kmem_cache_free(dev_priv->slab, obj); +} + static int i915_gem_create(struct drm_file *file, struct drm_device *dev, @@ -216,7 +228,7 @@ i915_gem_create(struct drm_file *file, if (ret) { drm_gem_object_release(&obj->base); i915_gem_info_remove_obj(dev->dev_private, obj->base.size); - kfree(obj); + i915_gem_object_free(obj); return ret; } @@ -3731,12 +3743,12 @@ struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev, struct address_space *mapping; u32 mask; - obj = kzalloc(sizeof(*obj), GFP_KERNEL); + obj = i915_gem_object_alloc(dev); if (obj == NULL) return NULL; if (drm_gem_object_init(dev, &obj->base, size) != 0) { - kfree(obj); + i915_gem_object_free(obj); return NULL; } @@ -3819,7 +3831,7 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj) i915_gem_info_remove_obj(dev_priv, obj->base.size); kfree(obj->bit_17); - kfree(obj); + i915_gem_object_free(obj); } int @@ -4197,8 +4209,14 @@ init_ring_lists(struct intel_ring_buffer *ring) void i915_gem_load(struct drm_device *dev) { - int i; drm_i915_private_t *dev_priv = dev->dev_private; + int i; + + dev_priv->slab = + kmem_cache_create("i915_gem_object", + sizeof(struct drm_i915_gem_object), 0, + SLAB_HWCACHE_ALIGN, + NULL); INIT_LIST_HEAD(&dev_priv->mm.active_list); INIT_LIST_HEAD(&dev_priv->mm.inactive_list); diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 5e72e95..9ba5e7f 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -260,8 +260,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, if (IS_ERR(attach)) return ERR_CAST(attach); - - obj = kzalloc(sizeof(*obj), GFP_KERNEL); + obj = i915_gem_object_alloc(dev); if (obj == NULL) { ret = -ENOMEM; goto fail_detach; @@ -269,7 +268,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, ret = drm_gem_private_object_init(dev, &obj->base, dma_buf->size); if (ret) { - kfree(obj); + i915_gem_object_free(obj); goto fail_detach; } diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index eca3af1..4cdd6cc 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -259,7 +259,7 @@ _i915_gem_object_create_stolen(struct drm_device *dev, { struct drm_i915_gem_object *obj; - obj = kzalloc(sizeof(*obj), GFP_KERNEL); + obj = i915_gem_object_alloc(dev); if (obj == NULL) return NULL; @@ -284,7 +284,7 @@ _i915_gem_object_create_stolen(struct drm_device *dev, return obj; cleanup: - kfree(obj); + i915_gem_object_free(obj); return NULL; }