forked from Minki/linux
44653988ef
We would like to be able to exercise huge allocations even on memory constrained devices. To do this we create an object that allocates only a few pages and remaps them across its whole range - each page is reused multiple times. We can therefore pretend we are rendering into a much larger object. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-9-chris@chris-wilson.co.uk
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "huge_gem_object.h"
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static void huge_free_pages(struct drm_i915_gem_object *obj,
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struct sg_table *pages)
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{
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unsigned long nreal = obj->scratch / PAGE_SIZE;
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struct scatterlist *sg;
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for (sg = pages->sgl; sg && nreal--; sg = __sg_next(sg))
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__free_page(sg_page(sg));
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sg_free_table(pages);
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kfree(pages);
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}
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static struct sg_table *
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huge_get_pages(struct drm_i915_gem_object *obj)
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{
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#define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
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const unsigned long nreal = obj->scratch / PAGE_SIZE;
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const unsigned long npages = obj->base.size / PAGE_SIZE;
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struct scatterlist *sg, *src, *end;
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struct sg_table *pages;
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unsigned long n;
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pages = kmalloc(sizeof(*pages), GFP);
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if (!pages)
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return ERR_PTR(-ENOMEM);
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if (sg_alloc_table(pages, npages, GFP)) {
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kfree(pages);
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return ERR_PTR(-ENOMEM);
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}
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sg = pages->sgl;
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for (n = 0; n < nreal; n++) {
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struct page *page;
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page = alloc_page(GFP | __GFP_HIGHMEM);
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if (!page) {
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sg_mark_end(sg);
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goto err;
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}
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sg_set_page(sg, page, PAGE_SIZE, 0);
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sg = __sg_next(sg);
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}
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if (nreal < npages) {
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for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {
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sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);
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src = __sg_next(src);
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if (src == end)
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src = pages->sgl;
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}
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}
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if (i915_gem_gtt_prepare_pages(obj, pages))
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goto err;
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return pages;
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err:
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huge_free_pages(obj, pages);
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return ERR_PTR(-ENOMEM);
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#undef GFP
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}
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static void huge_put_pages(struct drm_i915_gem_object *obj,
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struct sg_table *pages)
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{
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i915_gem_gtt_finish_pages(obj, pages);
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huge_free_pages(obj, pages);
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obj->mm.dirty = false;
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}
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static const struct drm_i915_gem_object_ops huge_ops = {
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.flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
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I915_GEM_OBJECT_IS_SHRINKABLE,
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.get_pages = huge_get_pages,
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.put_pages = huge_put_pages,
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};
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struct drm_i915_gem_object *
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huge_gem_object(struct drm_i915_private *i915,
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phys_addr_t phys_size,
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dma_addr_t dma_size)
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{
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struct drm_i915_gem_object *obj;
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GEM_BUG_ON(!phys_size || phys_size > dma_size);
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GEM_BUG_ON(!IS_ALIGNED(phys_size, PAGE_SIZE));
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GEM_BUG_ON(!IS_ALIGNED(dma_size, I915_GTT_PAGE_SIZE));
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if (overflows_type(dma_size, obj->base.size))
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return ERR_PTR(-E2BIG);
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obj = i915_gem_object_alloc(i915);
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if (!obj)
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return ERR_PTR(-ENOMEM);
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drm_gem_private_object_init(&i915->drm, &obj->base, dma_size);
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i915_gem_object_init(obj, &huge_ops);
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obj->base.write_domain = I915_GEM_DOMAIN_CPU;
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obj->base.read_domains = I915_GEM_DOMAIN_CPU;
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obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
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obj->scratch = phys_size;
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return obj;
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}
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