From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: [PATCH 19/24] drm/i915: Introduce i915_gem_object_create_stolen() Date: Tue, 4 Sep 2012 21:03:11 +0100 Message-ID: <1346788996-19080-20-git-send-email-chris@chris-wilson.co.uk> References: <1346788996-19080-1-git-send-email-chris@chris-wilson.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from fireflyinternet.com (smtp.fireflyinternet.com [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id 0145AA01D2 for ; Tue, 4 Sep 2012 13:06:33 -0700 (PDT) In-Reply-To: <1346788996-19080-1-git-send-email-chris@chris-wilson.co.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Allow for the creation of GEM objects backed by stolen memory. As these are not backed by ordinary pages, we create a fake dma mapping and store the address in the scatterlist rather than obj->pages. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_drv.h | 3 + drivers/gpu/drm/i915/i915_gem.c | 1 + drivers/gpu/drm/i915/i915_gem_stolen.c | 122 ++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index cc3cc4f..f19a4f2 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1500,6 +1500,9 @@ int i915_gem_evict_everything(struct drm_device *dev); int i915_gem_init_stolen(struct drm_device *dev); int i915_gem_stolen_setup_compression(struct drm_device *dev); void i915_gem_cleanup_stolen(struct drm_device *dev); +struct drm_i915_gem_object * +i915_gem_object_create_stolen(struct drm_device *dev, u32 size); +void i915_gem_object_release_stolen(struct drm_i915_gem_object *obj); /* i915_gem_tiling.c */ void i915_gem_detect_bit_6_swizzle(struct drm_device *dev); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 070ddf2..2c04ea4 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3847,6 +3847,7 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj) obj->pages_pin_count = 0; i915_gem_object_put_pages(obj); i915_gem_object_free_mmap_offset(obj); + i915_gem_object_release_stolen(obj); BUG_ON(obj->pages); diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 17119d7..d91f6eb 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -198,3 +198,125 @@ int i915_gem_init_stolen(struct drm_device *dev) return 0; } + +static struct sg_table * +i915_pages_create_for_stolen(struct drm_device *dev, + u32 offset, u32 size) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct sg_table *st; + struct scatterlist *sg; + + /* We hide that we have no struct page backing our stolen object + * by wrapping the contiguous physical allocation with a fake + * dma mapping in a single scatterlist. + */ + + st = kmalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) + return NULL; + + if (!sg_alloc_table(st, 1, GFP_KERNEL)) { + kfree(st); + return NULL; + } + + sg = st->sgl; + sg->offset = offset; + sg->length = size; + + sg_dma_address(sg) = dev_priv->mm.stolen_base + offset; + sg_dma_len(sg) = size; + + return st; +} + +static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) +{ + BUG(); + return -EINVAL; +} + +static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) +{ + /* Should only be called during free */ + sg_free_table(obj->pages); + kfree(obj->pages); +} + +static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { + .get_pages = i915_gem_object_get_pages_stolen, + .put_pages = i915_gem_object_put_pages_stolen, +}; + +struct drm_i915_gem_object * +_i915_gem_object_create_stolen(struct drm_device *dev, + struct drm_mm_node *stolen) +{ + struct drm_i915_gem_object *obj; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (obj == NULL) + return NULL; + + if (drm_gem_private_object_init(dev, &obj->base, stolen->size)) + goto cleanup; + + i915_gem_object_init(obj, &i915_gem_object_stolen_ops); + + obj->pages = i915_pages_create_for_stolen(dev, + stolen->start, stolen->size); + if (obj->pages == NULL) + goto cleanup; + + obj->has_dma_mapping = true; + obj->pages_pin_count = 1; + obj->stolen = stolen; + + obj->base.write_domain = I915_GEM_DOMAIN_GTT; + obj->base.read_domains = I915_GEM_DOMAIN_GTT; + obj->cache_level = I915_CACHE_NONE; + + return obj; + +cleanup: + kfree(obj); + 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; + + if (dev_priv->mm.stolen_base == 0) + return 0; + + DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); + if (size == 0) + return NULL; + + stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0); + if (stolen) + stolen = drm_mm_get_block(stolen, size, 4096); + if (stolen == NULL) + return NULL; + + obj = _i915_gem_object_create_stolen(dev, stolen); + if (obj) + return obj; + + drm_mm_put_block(stolen); + return NULL; +} + +void +i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) +{ + if (obj->stolen) { + drm_mm_put_block(obj->stolen); + obj->stolen = NULL; + } +} -- 1.7.10.4