1 /*
2 * Copyright © 2016 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
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,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25 #include "huge_gem_object.h"
26
huge_free_pages(struct drm_i915_gem_object * obj,struct sg_table * pages)27 static void huge_free_pages(struct drm_i915_gem_object *obj,
28 struct sg_table *pages)
29 {
30 unsigned long nreal = obj->scratch / PAGE_SIZE;
31 struct scatterlist *sg;
32
33 for (sg = pages->sgl; sg && nreal--; sg = __sg_next(sg))
34 __free_page(sg_page(sg));
35
36 sg_free_table(pages);
37 kfree(pages);
38 }
39
huge_get_pages(struct drm_i915_gem_object * obj)40 static int huge_get_pages(struct drm_i915_gem_object *obj)
41 {
42 #define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
43 const unsigned long nreal = obj->scratch / PAGE_SIZE;
44 const unsigned long npages = obj->base.size / PAGE_SIZE;
45 struct scatterlist *sg, *src, *end;
46 struct sg_table *pages;
47 unsigned long n;
48
49 pages = kmalloc(sizeof(*pages), GFP);
50 if (!pages)
51 return -ENOMEM;
52
53 if (sg_alloc_table(pages, npages, GFP)) {
54 kfree(pages);
55 return -ENOMEM;
56 }
57
58 sg = pages->sgl;
59 for (n = 0; n < nreal; n++) {
60 struct page *page;
61
62 page = alloc_page(GFP | __GFP_HIGHMEM);
63 if (!page) {
64 sg_mark_end(sg);
65 goto err;
66 }
67
68 sg_set_page(sg, page, PAGE_SIZE, 0);
69 sg = __sg_next(sg);
70 }
71 if (nreal < npages) {
72 for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {
73 sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);
74 src = __sg_next(src);
75 if (src == end)
76 src = pages->sgl;
77 }
78 }
79
80 if (i915_gem_gtt_prepare_pages(obj, pages))
81 goto err;
82
83 __i915_gem_object_set_pages(obj, pages, PAGE_SIZE);
84
85 return 0;
86
87 err:
88 huge_free_pages(obj, pages);
89
90 return -ENOMEM;
91 #undef GFP
92 }
93
huge_put_pages(struct drm_i915_gem_object * obj,struct sg_table * pages)94 static void huge_put_pages(struct drm_i915_gem_object *obj,
95 struct sg_table *pages)
96 {
97 i915_gem_gtt_finish_pages(obj, pages);
98 huge_free_pages(obj, pages);
99
100 obj->mm.dirty = false;
101 }
102
103 static const struct drm_i915_gem_object_ops huge_ops = {
104 .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
105 I915_GEM_OBJECT_IS_SHRINKABLE,
106 .get_pages = huge_get_pages,
107 .put_pages = huge_put_pages,
108 };
109
110 struct drm_i915_gem_object *
huge_gem_object(struct drm_i915_private * i915,phys_addr_t phys_size,dma_addr_t dma_size)111 huge_gem_object(struct drm_i915_private *i915,
112 phys_addr_t phys_size,
113 dma_addr_t dma_size)
114 {
115 struct drm_i915_gem_object *obj;
116 unsigned int cache_level;
117
118 GEM_BUG_ON(!phys_size || phys_size > dma_size);
119 GEM_BUG_ON(!IS_ALIGNED(phys_size, PAGE_SIZE));
120 GEM_BUG_ON(!IS_ALIGNED(dma_size, I915_GTT_PAGE_SIZE));
121
122 if (overflows_type(dma_size, obj->base.size))
123 return ERR_PTR(-E2BIG);
124
125 obj = i915_gem_object_alloc(i915);
126 if (!obj)
127 return ERR_PTR(-ENOMEM);
128
129 drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);
130 i915_gem_object_init(obj, &huge_ops);
131
132 obj->read_domains = I915_GEM_DOMAIN_CPU;
133 obj->write_domain = I915_GEM_DOMAIN_CPU;
134 cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
135 i915_gem_object_set_cache_coherency(obj, cache_level);
136 obj->scratch = phys_size;
137
138 return obj;
139 }
140
