From patchwork Thu Mar 6 20:25:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 3786381 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id EBF149F35F for ; Thu, 6 Mar 2014 20:25:56 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E9B1D2024C for ; Thu, 6 Mar 2014 20:25:55 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 9CC5820213 for ; Thu, 6 Mar 2014 20:25:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 89890FAA69; Thu, 6 Mar 2014 12:25:51 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from relay.fireflyinternet.com (hostedrelay.fireflyinternet.com [109.228.30.76]) by gabe.freedesktop.org (Postfix) with ESMTP id 22AA5FAA69 for ; Thu, 6 Mar 2014 12:25:48 -0800 (PST) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.73.22; Received: from haswell.alporthouse.com (unverified [78.156.73.22]) by relay.fireflyinternet.com (FireflyRelay1) with ESMTP id 10736664-1305619 for multiple; Thu, 06 Mar 2014 20:27:55 +0000 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Thu, 6 Mar 2014 20:25:35 +0000 Message-Id: <1394137535-31752-1-git-send-email-chris@chris-wilson.co.uk> X-Mailer: git-send-email 1.9.0 X-Authenticated-User: chris.alporthouse@surfanytime.net Cc: "Gupta, Sourab" , "Goel, Akash" Subject: [Intel-gfx] [PATCH] drm/i915: Add support for stealing purgable stolen pages 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@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If we run out of stolen memory when trying to allocate an object, see if we can reap enough purgeable objects to free up enough contiguous free space for the allocation. This is in principle very much like evicting objects to free up enough contiguous space in the vma when binding a new object - and you will be forgiven for thinking that the code looks very similar. At the moment, we do not allow userspace to allocate objects in stolen, so there is neither the memory pressure to trigger stolen eviction nor any purgeable objects inside the stolen arena. However, this will change in the near future, and so better management and defragmentation of stolen memory will become a real issue. Signed-off-by: Chris Wilson Cc: "Gupta, Sourab" Cc: "Goel, Akash" --- drivers/gpu/drm/i915/i915_gem_stolen.c | 119 ++++++++++++++++++++++++++++++--- 1 file changed, 108 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 13a849afe479..411a8452c918 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -446,18 +446,25 @@ cleanup: return NULL; } -struct drm_i915_gem_object * -i915_gem_object_create_stolen(struct drm_device *dev, u32 size) +static bool mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) +{ + if (obj->stolen == NULL) + return false; + + if (obj->madv != I915_MADV_DONTNEED) + return false; + + list_add(&obj->obj_exec_link, unwind); + return drm_mm_scan_add_block(obj->stolen); +} + +static struct drm_mm_node *stolen_alloc(struct drm_i915_private *dev_priv, u32 size) { - struct drm_i915_private *dev_priv = dev->dev_private; - struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; + struct drm_i915_gem_object *obj; + struct list_head unwind, evict; int ret; - if (!drm_mm_initialized(&dev_priv->mm.stolen)) - return NULL; - - DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); if (size == 0) return NULL; @@ -467,11 +474,101 @@ i915_gem_object_create_stolen(struct drm_device *dev, u32 size) ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, 4096, DRM_MM_SEARCH_DEFAULT); - if (ret) { - kfree(stolen); - return NULL; + if (ret == 0) + return stolen; + + /* No more stolen memory available, or too fragmented. + * Try evicting purgeable objects and search again. + */ + + drm_mm_init_scan(&dev_priv->mm.stolen, size, 4096, 0); + INIT_LIST_HEAD(&unwind); + + list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_list) + if (mark_free(obj, &unwind)) + goto found; + + list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) + if (mark_free(obj, &unwind)) + goto found; + +found: + INIT_LIST_HEAD(&evict); + while (!list_empty(&unwind)) { + obj = list_first_entry(&unwind, + struct drm_i915_gem_object, + obj_exec_link); + list_del_init(&obj->obj_exec_link); + + if (drm_mm_scan_remove_block(obj->stolen)) { + list_add(&obj->obj_exec_link, &evict); + drm_gem_object_reference(&obj->base); + } } + ret = 0; + while (!list_empty(&evict)) { + obj = list_first_entry(&evict, + struct drm_i915_gem_object, + obj_exec_link); + list_del_init(&obj->obj_exec_link); + + if (ret == 0) { + struct i915_vma *vma, *vma_next; + + list_for_each_entry_safe(vma, vma_next, + &obj->vma_list, + vma_link) + if (i915_vma_unbind(vma)) + break; + + /* Stolen pins its pages to prevent the + * normal shrinker from processing stolen + * objects. + */ + i915_gem_object_unpin_pages(obj); + + ret = i915_gem_object_put_pages(obj); + if (ret == 0) { + obj->madv = __I915_MADV_PURGED; + + kfree(obj->stolen); + obj->stolen = NULL; + } else + i915_gem_object_pin_pages(obj); + } + + drm_gem_object_unreference(&obj->base); + } + + if (ret == 0) + ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size, + 4096, DRM_MM_SEARCH_DEFAULT); + if (ret == 0) + return stolen; + + kfree(stolen); + return NULL; +} + +struct drm_i915_gem_object * +i915_gem_object_create_stolen(struct drm_device *dev, u32 size) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct drm_i915_gem_object *obj; + struct drm_mm_node *stolen; + + lockdep_assert_held(&dev->struct_mutex); + + if (!drm_mm_initialized(&dev_priv->mm.stolen)) + return NULL; + + DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); + + stolen = stolen_alloc(dev_priv, size); + if (stolen == NULL) + return NULL; + obj = _i915_gem_object_create_stolen(dev, stolen); if (obj) return obj;