2 * Copyright © 2014-2016 Intel Corporation
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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26 #include <drm/i915_drm.h>
29 #define QUIET (__GFP_NORETRY | __GFP_NOWARN)
31 /* convert swiotlb segment size into sensible units (pages)! */
32 #define IO_TLB_SEGPAGES (IO_TLB_SEGSIZE << IO_TLB_SHIFT >> PAGE_SHIFT)
34 static void internal_free_pages(struct sg_table *st)
36 struct scatterlist *sg;
38 for (sg = st->sgl; sg; sg = __sg_next(sg))
39 __free_pages(sg_page(sg), get_order(sg->length));
45 static struct sg_table *
46 i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)
48 struct drm_i915_private *i915 = to_i915(obj->base.dev);
49 unsigned int npages = obj->base.size / PAGE_SIZE;
51 struct scatterlist *sg;
55 st = kmalloc(sizeof(*st), GFP_KERNEL);
57 return ERR_PTR(-ENOMEM);
59 if (sg_alloc_table(st, npages, GFP_KERNEL)) {
61 return ERR_PTR(-ENOMEM);
67 max_order = MAX_ORDER;
69 if (swiotlb_nr_tbl()) {
70 unsigned int max_segment;
72 max_segment = swiotlb_max_segment();
74 max_segment = max_t(unsigned int, max_segment,
75 PAGE_SIZE) >> PAGE_SHIFT;
76 max_order = min(max_order, ilog2(max_segment));
81 gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_RECLAIMABLE;
82 if (IS_CRESTLINE(i915) || IS_BROADWATER(i915)) {
83 /* 965gm cannot relocate objects above 4GiB. */
84 gfp &= ~__GFP_HIGHMEM;
89 int order = min(fls(npages) - 1, max_order);
93 page = alloc_pages(gfp | (order ? QUIET : 0), order);
99 /* Limit subsequent allocations as well */
103 sg_set_page(sg, page, PAGE_SIZE << order, 0);
106 npages -= 1 << order;
115 if (i915_gem_gtt_prepare_pages(obj, st))
118 /* Mark the pages as dontneed whilst they are still pinned. As soon
119 * as they are unpinned they are allowed to be reaped by the shrinker,
120 * and the caller is expected to repopulate - the contents of this
121 * object are only valid whilst active and pinned.
123 obj->mm.madv = I915_MADV_DONTNEED;
128 internal_free_pages(st);
129 return ERR_PTR(-ENOMEM);
132 static void i915_gem_object_put_pages_internal(struct drm_i915_gem_object *obj,
133 struct sg_table *pages)
135 i915_gem_gtt_finish_pages(obj, pages);
136 internal_free_pages(pages);
138 obj->mm.dirty = false;
139 obj->mm.madv = I915_MADV_WILLNEED;
142 static const struct drm_i915_gem_object_ops i915_gem_object_internal_ops = {
143 .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
144 I915_GEM_OBJECT_IS_SHRINKABLE,
145 .get_pages = i915_gem_object_get_pages_internal,
146 .put_pages = i915_gem_object_put_pages_internal,
150 * Creates a new object that wraps some internal memory for private use.
151 * This object is not backed by swappable storage, and as such its contents
152 * are volatile and only valid whilst pinned. If the object is reaped by the
153 * shrinker, its pages and data will be discarded. Equally, it is not a full
154 * GEM object and so not valid for access from userspace. This makes it useful
155 * for hardware interfaces like ringbuffers (which are pinned from the time
156 * the request is written to the time the hardware stops accessing it), but
157 * not for contexts (which need to be preserved when not active for later
158 * reuse). Note that it is not cleared upon allocation.
160 struct drm_i915_gem_object *
161 i915_gem_object_create_internal(struct drm_i915_private *i915,
164 struct drm_i915_gem_object *obj;
166 obj = i915_gem_object_alloc(&i915->drm);
168 return ERR_PTR(-ENOMEM);
170 drm_gem_private_object_init(&i915->drm, &obj->base, size);
171 i915_gem_object_init(obj, &i915_gem_object_internal_ops);
173 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
174 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
175 obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;