132 lines · c
1/*2 * SPDX-License-Identifier: MIT3 *4 * Copyright © 2016 Intel Corporation5 */6 7#include "i915_scatterlist.h"8 9#include "huge_gem_object.h"10 11static void huge_free_pages(struct drm_i915_gem_object *obj,12 struct sg_table *pages)13{14 unsigned long nreal = obj->scratch / PAGE_SIZE;15 struct sgt_iter sgt_iter;16 struct page *page;17 18 for_each_sgt_page(page, sgt_iter, pages) {19 __free_page(page);20 if (!--nreal)21 break;22 }23 24 sg_free_table(pages);25 kfree(pages);26}27 28static int huge_get_pages(struct drm_i915_gem_object *obj)29{30#define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL)31 const unsigned long nreal = obj->scratch / PAGE_SIZE;32 unsigned int npages; /* restricted by sg_alloc_table */33 struct scatterlist *sg, *src, *end;34 struct sg_table *pages;35 unsigned long n;36 37 if (overflows_type(obj->base.size / PAGE_SIZE, npages))38 return -E2BIG;39 40 npages = obj->base.size / PAGE_SIZE;41 pages = kmalloc(sizeof(*pages), GFP);42 if (!pages)43 return -ENOMEM;44 45 if (sg_alloc_table(pages, npages, GFP)) {46 kfree(pages);47 return -ENOMEM;48 }49 50 sg = pages->sgl;51 for (n = 0; n < nreal; n++) {52 struct page *page;53 54 page = alloc_page(GFP | __GFP_HIGHMEM);55 if (!page) {56 sg_mark_end(sg);57 goto err;58 }59 60 sg_set_page(sg, page, PAGE_SIZE, 0);61 sg = __sg_next(sg);62 }63 if (nreal < npages) {64 for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {65 sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);66 src = __sg_next(src);67 if (src == end)68 src = pages->sgl;69 }70 }71 72 if (i915_gem_gtt_prepare_pages(obj, pages))73 goto err;74 75 __i915_gem_object_set_pages(obj, pages);76 77 return 0;78 79err:80 huge_free_pages(obj, pages);81 return -ENOMEM;82#undef GFP83}84 85static void huge_put_pages(struct drm_i915_gem_object *obj,86 struct sg_table *pages)87{88 i915_gem_gtt_finish_pages(obj, pages);89 huge_free_pages(obj, pages);90 91 obj->mm.dirty = false;92}93 94static const struct drm_i915_gem_object_ops huge_ops = {95 .name = "huge-gem",96 .get_pages = huge_get_pages,97 .put_pages = huge_put_pages,98};99 100struct drm_i915_gem_object *101huge_gem_object(struct drm_i915_private *i915,102 phys_addr_t phys_size,103 dma_addr_t dma_size)104{105 static struct lock_class_key lock_class;106 struct drm_i915_gem_object *obj;107 unsigned int cache_level;108 109 GEM_BUG_ON(!phys_size || phys_size > dma_size);110 GEM_BUG_ON(!IS_ALIGNED(phys_size, PAGE_SIZE));111 GEM_BUG_ON(!IS_ALIGNED(dma_size, I915_GTT_PAGE_SIZE));112 113 if (overflows_type(dma_size, obj->base.size))114 return ERR_PTR(-E2BIG);115 116 obj = i915_gem_object_alloc();117 if (!obj)118 return ERR_PTR(-ENOMEM);119 120 drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);121 i915_gem_object_init(obj, &huge_ops, &lock_class, 0);122 obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE;123 124 obj->read_domains = I915_GEM_DOMAIN_CPU;125 obj->write_domain = I915_GEM_DOMAIN_CPU;126 cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;127 i915_gem_object_set_cache_coherency(obj, cache_level);128 obj->scratch = phys_size;129 130 return obj;131}132