2 * SPDX-License-Identifier: MIT
4 * Copyright © 2016 Intel Corporation
7 #include "i915_scatterlist.h"
9 #include "huge_gem_object.h"
11 static void huge_free_pages(struct drm_i915_gem_object *obj,
12 struct sg_table *pages)
14 unsigned long nreal = obj->scratch / PAGE_SIZE;
15 struct scatterlist *sg;
17 for (sg = pages->sgl; sg && nreal--; sg = __sg_next(sg))
18 __free_page(sg_page(sg));
24 static int huge_get_pages(struct drm_i915_gem_object *obj)
26 #define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
27 const unsigned long nreal = obj->scratch / PAGE_SIZE;
28 const unsigned long npages = obj->base.size / PAGE_SIZE;
29 struct scatterlist *sg, *src, *end;
30 struct sg_table *pages;
33 pages = kmalloc(sizeof(*pages), GFP);
37 if (sg_alloc_table(pages, npages, GFP)) {
43 for (n = 0; n < nreal; n++) {
46 page = alloc_page(GFP | __GFP_HIGHMEM);
52 sg_set_page(sg, page, PAGE_SIZE, 0);
56 for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {
57 sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);
64 if (i915_gem_gtt_prepare_pages(obj, pages))
67 __i915_gem_object_set_pages(obj, pages, PAGE_SIZE);
72 huge_free_pages(obj, pages);
78 static void huge_put_pages(struct drm_i915_gem_object *obj,
79 struct sg_table *pages)
81 i915_gem_gtt_finish_pages(obj, pages);
82 huge_free_pages(obj, pages);
84 obj->mm.dirty = false;
87 static const struct drm_i915_gem_object_ops huge_ops = {
88 .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
89 I915_GEM_OBJECT_IS_SHRINKABLE,
90 .get_pages = huge_get_pages,
91 .put_pages = huge_put_pages,
94 struct drm_i915_gem_object *
95 huge_gem_object(struct drm_i915_private *i915,
96 phys_addr_t phys_size,
99 struct drm_i915_gem_object *obj;
100 unsigned int cache_level;
102 GEM_BUG_ON(!phys_size || phys_size > dma_size);
103 GEM_BUG_ON(!IS_ALIGNED(phys_size, PAGE_SIZE));
104 GEM_BUG_ON(!IS_ALIGNED(dma_size, I915_GTT_PAGE_SIZE));
106 if (overflows_type(dma_size, obj->base.size))
107 return ERR_PTR(-E2BIG);
109 obj = i915_gem_object_alloc();
111 return ERR_PTR(-ENOMEM);
113 drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);
114 i915_gem_object_init(obj, &huge_ops);
116 obj->read_domains = I915_GEM_DOMAIN_CPU;
117 obj->write_domain = I915_GEM_DOMAIN_CPU;
118 cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
119 i915_gem_object_set_cache_coherency(obj, cache_level);
120 obj->scratch = phys_size;