a5c0816626
In preparation for supporting huge gtt pages for the ppgtt, we introduce
page size members for gem objects. We fill in the page sizes by
scanning the sg table.
v2: pass the sg_mask to set_pages
v3: calculate the sg_mask inline with populating the sg_table where
possible, and pass to set_pages along with the pages.
v4: bunch of improvements from Joonas
v5: fix num_pages blunder
introduce i915_sg_page_sizes helper
v6: prefer GEM_BUG_ON(sizes == 0)
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-7-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-6-chris@chris-wilson.co.uk
140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/*
|
|
* 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 int 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 -ENOMEM;
|
|
|
|
if (sg_alloc_table(pages, npages, GFP)) {
|
|
kfree(pages);
|
|
return -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;
|
|
|
|
__i915_gem_object_set_pages(obj, pages, PAGE_SIZE);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
huge_free_pages(obj, pages);
|
|
|
|
return -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;
|
|
}
|