130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* Copyright © 2008-2012 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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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Chris Wilson <chris@chris-wilson.co.uk>
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*
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*/
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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static struct sg_table *
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i915_pages_create_for_fb(struct drm_device *dev,
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u32 offset, u32 size)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct sg_table *st;
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struct scatterlist *sg;
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addr_t fb_pages;
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DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
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// BUG_ON(offset > dev_priv->gtt.stolen_size - size);
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/* We hide that we have no struct page backing our stolen object
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* by wrapping the contiguous physical allocation with a fake
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* dma mapping in a single scatterlist.
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*/
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st = kmalloc(sizeof(*st), GFP_KERNEL);
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if (st == NULL)
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return NULL;
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if (sg_alloc_table(st, 1, GFP_KERNEL)) {
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kfree(st);
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return NULL;
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}
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fb_pages = AllocPages(size/PAGE_SIZE);
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if(fb_pages == 0)
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{
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kfree(st);
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return NULL;
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};
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sg = st->sgl;
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sg->offset = offset;
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sg->length = size;
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sg_dma_address(sg) = (dma_addr_t)fb_pages;
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sg_dma_len(sg) = size;
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return st;
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}
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static int kos_fb_object_get_pages(struct drm_i915_gem_object *obj)
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{
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BUG();
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return -EINVAL;
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}
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static void kos_fb_object_put_pages(struct drm_i915_gem_object *obj)
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{
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/* Should only be called during free */
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sg_free_table(obj->pages);
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kfree(obj->pages);
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}
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static const struct drm_i915_gem_object_ops kos_fb_object_ops = {
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.get_pages = kos_fb_object_get_pages,
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.put_pages = kos_fb_object_put_pages,
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};
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static struct drm_i915_gem_object *
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_kos_fb_object_create(struct drm_device *dev,
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struct drm_mm_node *fb_node)
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{
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struct drm_i915_gem_object *obj;
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obj = i915_gem_object_alloc(dev);
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if (obj == NULL)
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return NULL;
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drm_gem_private_object_init(dev, &obj->base, fb_node->size);
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i915_gem_object_init(obj, &kos_fb_object_ops);
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obj->pages = i915_pages_create_for_fb(dev,
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fb_node->start, fb_node->size);
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if (obj->pages == NULL)
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goto cleanup;
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obj->has_dma_mapping = true;
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i915_gem_object_pin_pages(obj);
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obj->stolen = fb_node;
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obj->base.read_domains = I915_GEM_DOMAIN_GTT;
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obj->cache_level = I915_CACHE_NONE;
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obj->tiling_mode = I915_TILING_X;
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return obj;
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cleanup:
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i915_gem_object_free(obj);
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return NULL;
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}
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