From patchwork Sat Aug 11 14:41:08 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 1308821 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 B9481DF2D2 for ; Sat, 11 Aug 2012 14:58:43 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8D233A01F7 for ; Sat, 11 Aug 2012 07:58:43 -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 BA9A39F758 for ; Sat, 11 Aug 2012 07:42:33 -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 120056223-1500050 for multiple; Sat, 11 Aug 2012 15:42:01 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Sat, 11 Aug 2012 15:41:08 +0100 Message-Id: <1344696088-24760-10-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 09/29] drm/i915: Pin backing pages whilst exporting through a dmabuf vmap 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 We need to refcount our pages in order to prevent reaping them at inopportune times, such as when they currently vmapped or exported to another driver. However, we also wish to keep the lazy deallocation of our pages so we need to take a pin/unpinned approach rather than a simple refcount. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_drv.h | 12 ++++++++++++ drivers/gpu/drm/i915/i915_gem.c | 11 +++++++++-- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 9 +++++++-- 3 files changed, 28 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c42190b..0805040f 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -989,6 +989,7 @@ struct drm_i915_gem_object { unsigned int has_global_gtt_mapping:1; struct page **pages; + int pages_pin_count; /** * DMAR support @@ -1322,6 +1323,17 @@ void i915_gem_release_mmap(struct drm_i915_gem_object *obj); void i915_gem_lastclose(struct drm_device *dev); int __must_check i915_gem_object_get_pages(struct drm_i915_gem_object *obj); +static inline void i915_gem_object_pin_pages(struct drm_i915_gem_object *obj) +{ + BUG_ON(obj->pages == NULL); + obj->pages_pin_count++; +} +static inline void i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj) +{ + BUG_ON(obj->pages_pin_count == 0); + obj->pages_pin_count--; +} + int __must_check i915_mutex_lock_interruptible(struct drm_device *dev); int i915_gem_object_sync(struct drm_i915_gem_object *obj, struct intel_ring_buffer *to); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index ed6a1ec..c90e265 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1455,6 +1455,9 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj) if (obj->sg_table || obj->pages == NULL) return 0; + if (obj->pages_pin_count) + return -EBUSY; + ops->put_pages(obj); list_del(&obj->gtt_list); @@ -1586,6 +1589,8 @@ i915_gem_object_get_pages(struct drm_i915_gem_object *obj) if (obj->sg_table || obj->pages) return 0; + BUG_ON(obj->pages_pin_count); + ret = ops->get_pages(obj); if (ret) return ret; @@ -3685,6 +3690,7 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj) dev_priv->mm.interruptible = was_interruptible; } + obj->pages_pin_count = 0; i915_gem_object_put_pages(obj); i915_gem_object_free_mmap_offset(obj); @@ -4344,9 +4350,10 @@ i915_gem_inactive_shrink(struct shrinker *shrinker, struct shrink_control *sc) cnt = 0; list_for_each_entry(obj, &dev_priv->mm.unbound_list, gtt_list) - cnt += obj->base.size >> PAGE_SHIFT; + if (obj->pages_pin_count == 0) + cnt += obj->base.size >> PAGE_SHIFT; list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list) - if (obj->pin_count == 0) + if (obj->pin_count == 0 && obj->pages_pin_count == 0) cnt += obj->base.size >> PAGE_SHIFT; mutex_unlock(&dev->struct_mutex); diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 1203460..4a6982e 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -50,6 +50,8 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme /* link the pages into an SG then map the sg */ sg = drm_prime_pages_to_sg(obj->pages, npages); nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); + i915_gem_object_pin_pages(obj); + out: mutex_unlock(&dev->struct_mutex); return sg; @@ -72,6 +74,7 @@ static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) obj->base.export_dma_buf = NULL; drm_gem_object_unreference_unlocked(&obj->base); } + i915_gem_object_unpin_pages(obj); } static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) @@ -102,6 +105,7 @@ static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) } obj->vmapping_count = 1; + i915_gem_object_pin_pages(obj); out_unlock: mutex_unlock(&dev->struct_mutex); return obj->dma_buf_vmapping; @@ -117,10 +121,11 @@ static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) if (ret) return; - --obj->vmapping_count; - if (obj->vmapping_count == 0) { + if (--obj->vmapping_count == 0) { vunmap(obj->dma_buf_vmapping); obj->dma_buf_vmapping = NULL; + + i915_gem_object_unpin_pages(obj); } mutex_unlock(&dev->struct_mutex); }