From patchwork Mon Jun 16 15:29:06 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: sourab.gupta@intel.com X-Patchwork-Id: 4360401 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 8F1699F314 for ; Mon, 16 Jun 2014 15:29:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9C6C32020A for ; Mon, 16 Jun 2014 15:29:35 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id A5EFB20204 for ; Mon, 16 Jun 2014 15:29:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 49EA36E57B; Mon, 16 Jun 2014 08:29:34 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTP id 98BA46E57B for ; Mon, 16 Jun 2014 08:29:33 -0700 (PDT) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 16 Jun 2014 08:29:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,487,1400050800"; d="scan'208";a="556259857" Received: from sourabgu-desktop.iind.intel.com ([10.223.82.83]) by fmsmga002.fm.intel.com with ESMTP; 16 Jun 2014 08:29:22 -0700 From: sourab.gupta@intel.com To: intel-gfx@lists.freedesktop.org Date: Mon, 16 Jun 2014 20:59:06 +0530 Message-Id: <1402932546-16653-4-git-send-email-sourab.gupta@intel.com> X-Mailer: git-send-email 1.8.5.1 In-Reply-To: <1402932546-16653-1-git-send-email-sourab.gupta@intel.com> References: <1402932546-16653-1-git-send-email-sourab.gupta@intel.com> Cc: Daniel Vetter , Akash Goel , "Gupta, Sourab" Subject: [Intel-gfx] [PATCH 3/3] drm/i915: Add support for stealing purgable stolen pages X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 From: Chris Wilson 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. v2: Remember to remove the drm_mm_node. testcase: igt/gem_create2 Signed-off-by: Chris Wilson Cc: "Gupta, Sourab" Cc: "Goel, Akash" --- drivers/gpu/drm/i915/i915_gem_stolen.c | 121 ++++++++++++++++++++++++++++++--- 1 file changed, 110 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 6441178..042ae61 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -340,18 +340,29 @@ 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; + + if (i915_gem_obj_is_pinned(obj)) + 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; @@ -361,11 +372,99 @@ 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) { + i915_gem_object_release_stolen(obj); + obj->madv = __I915_MADV_PURGED; + } 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;