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/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include "huge_gem_object.h"
static void huge_free_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
unsigned long nreal = obj->scratch / PAGE_SIZE;
struct scatterlist *sg;
for (sg = pages->sgl; sg && nreal--; sg = __sg_next(sg))
__free_page(sg_page(sg));
sg_free_table(pages);
kfree(pages);
}
static struct sg_table *
huge_get_pages(struct drm_i915_gem_object *obj)
{
#define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
const unsigned long nreal = obj->scratch / PAGE_SIZE;
const unsigned long npages = obj->base.size / PAGE_SIZE;
struct scatterlist *sg, *src, *end;
struct sg_table *pages;
unsigned long n;
pages = kmalloc(sizeof(*pages), GFP);
if (!pages)
return ERR_PTR(-ENOMEM);
if (sg_alloc_table(pages, npages, GFP)) {
kfree(pages);
return ERR_PTR(-ENOMEM);
}
sg = pages->sgl;
for (n = 0; n < nreal; n++) {
struct page *page;
page = alloc_page(GFP | __GFP_HIGHMEM);
if (!page) {
sg_mark_end(sg);
goto err;
}
sg_set_page(sg, page, PAGE_SIZE, 0);
sg = __sg_next(sg);
}
if (nreal < npages) {
for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {
sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);
src = __sg_next(src);
if (src == end)
src = pages->sgl;
}
}
if (i915_gem_gtt_prepare_pages(obj, pages))
goto err;
return pages;
err:
huge_free_pages(obj, pages);
return ERR_PTR(-ENOMEM);
#undef GFP
}
static void huge_put_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
i915_gem_gtt_finish_pages(obj, pages);
huge_free_pages(obj, pages);
obj->mm.dirty = false;
}
static const struct drm_i915_gem_object_ops huge_ops = {
.flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
I915_GEM_OBJECT_IS_SHRINKABLE,
.get_pages = huge_get_pages,
.put_pages = huge_put_pages,
};
struct drm_i915_gem_object *
huge_gem_object(struct drm_i915_private *i915,
phys_addr_t phys_size,
dma_addr_t dma_size)
{
struct drm_i915_gem_object *obj;
unsigned int cache_level;
GEM_BUG_ON(!phys_size || phys_size > dma_size);
GEM_BUG_ON(!IS_ALIGNED(phys_size, PAGE_SIZE));
GEM_BUG_ON(!IS_ALIGNED(dma_size, I915_GTT_PAGE_SIZE));
if (overflows_type(dma_size, obj->base.size))
return ERR_PTR(-E2BIG);
obj = i915_gem_object_alloc(i915);
if (!obj)
return ERR_PTR(-ENOMEM);
drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);
i915_gem_object_init(obj, &huge_ops);
obj->base.read_domains = I915_GEM_DOMAIN_CPU;
obj->base.write_domain = I915_GEM_DOMAIN_CPU;
cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
i915_gem_object_set_cache_coherency(obj, cache_level);
obj->scratch = phys_size;
return obj;
}
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