From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: [PATCH 04/18] drm/i915: Avoid clearing preallocated regions from the GTT Date: Fri, 19 Oct 2012 18:03:10 +0100 Message-ID: <1350666204-8101-4-git-send-email-chris@chris-wilson.co.uk> References: <1350666204-8101-1-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 608819EF18 for ; Fri, 19 Oct 2012 10:05:02 -0700 (PDT) In-Reply-To: <1350666204-8101-1-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 Signed-off-by: Chris Wilson Reviewed-by: Jesse Barnes --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/i915_gem_gtt.c | 35 ++++++++++++++++++++++++++++++++--- 2 files changed, 34 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 687f379..589b2f3 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -908,6 +908,8 @@ enum i915_cache_level { I915_CACHE_LLC_MLC, /* gen6+, in docs at least! */ }; +#define I915_GTT_RESERVED ((struct drm_mm_node *)0x1) + struct drm_i915_gem_object_ops { /* Interface between the GEM object and its backing storage. * get_pages() is called once prior to the use of the associated set diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 47e427e..d9d3fc7 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -378,18 +378,47 @@ void i915_gem_init_global_gtt(struct drm_device *dev, unsigned long end) { drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_mm_node *entry; + struct drm_i915_gem_object *obj; - /* Substract the guard page ... */ + /* Subtract the guard page ... */ drm_mm_init(&dev_priv->mm.gtt_space, start, end - start - PAGE_SIZE); if (!HAS_LLC(dev)) dev_priv->mm.gtt_space.color_adjust = i915_gtt_color_adjust; + /* Mark any preallocated objects as occupied */ + list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list) { + DRM_DEBUG_KMS("reserving preallocated space: %x + %zx\n", + obj->gtt_offset, obj->base.size); + + BUG_ON(obj->gtt_space != I915_GTT_RESERVED); + obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space, + obj->gtt_offset, + obj->base.size, + false); + obj->has_global_gtt_mapping = 1; + } + dev_priv->mm.gtt_start = start; dev_priv->mm.gtt_mappable_end = mappable_end; dev_priv->mm.gtt_end = end; dev_priv->mm.gtt_total = end - start; dev_priv->mm.mappable_gtt_total = min(end, mappable_end) - start; - /* ... but ensure that we clear the entire range. */ - intel_gtt_clear_range(start / PAGE_SIZE, (end-start) / PAGE_SIZE); + /* Clear any non-preallocated blocks */ + list_for_each_entry(entry, &dev_priv->mm.gtt_space.hole_stack, hole_stack) { + unsigned long hole_start = entry->start + entry->size; + unsigned long hole_end = list_entry(entry->node_list.next, + struct drm_mm_node, + node_list)->start; + + DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n", + hole_start, hole_end); + + intel_gtt_clear_range(hole_start / PAGE_SIZE, + (hole_end-hole_start) / PAGE_SIZE); + } + + /* And finally clear the reserved guard page */ + intel_gtt_clear_range(end / PAGE_SIZE - 1, 1); } -- 1.7.10.4