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/*

 * Copyright © 2008-2012 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.

 *

 * Authors:

 *    Eric Anholt 

 *    Chris Wilson 

 *

 */

#include 

#include 

#include "i915_drv.h"

static struct sg_table *

i915_pages_create_for_fb(struct drm_device *dev,

                 u32 offset, u32 size)

{

    struct drm_i915_private *dev_priv = dev->dev_private;

    struct sg_table *st;

    struct scatterlist *sg;

    addr_t fb_pages;

    DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);

//    BUG_ON(offset > dev_priv->gtt.stolen_size - size);

    /* We hide that we have no struct page backing our stolen object

     * by wrapping the contiguous physical allocation with a fake

     * dma mapping in a single scatterlist.

     */

    st = kmalloc(sizeof(*st), GFP_KERNEL);

    if (st == NULL)

        return NULL;

    if (sg_alloc_table(st, 1, GFP_KERNEL)) {

        kfree(st);

        return NULL;

    }

    fb_pages = AllocPages(size/PAGE_SIZE);

    if(fb_pages == 0)

    {

        kfree(st);

        return NULL;

    };

    sg = st->sgl;

    sg->offset = offset;

    sg->length = size;

    sg_dma_address(sg) = (dma_addr_t)fb_pages;

    sg_dma_len(sg) = size;

    return st;

}

static int kos_fb_object_get_pages(struct drm_i915_gem_object *obj)

{

    BUG();

    return -EINVAL;

}

static void kos_fb_object_put_pages(struct drm_i915_gem_object *obj)

{

    /* Should only be called during free */

    sg_free_table(obj->pages);

    kfree(obj->pages);

}

static const struct drm_i915_gem_object_ops kos_fb_object_ops = {

    .get_pages = kos_fb_object_get_pages,

    .put_pages = kos_fb_object_put_pages,

};

static struct drm_i915_gem_object *

_kos_fb_object_create(struct drm_device *dev,

                   struct drm_mm_node *fb_node)

{

    struct drm_i915_gem_object *obj;

    obj = i915_gem_object_alloc(dev);

    if (obj == NULL)

        return NULL;

    drm_gem_private_object_init(dev, &obj->base, fb_node->size);

    i915_gem_object_init(obj, &kos_fb_object_ops);

    obj->pages = i915_pages_create_for_fb(dev,

                          fb_node->start, fb_node->size);

    if (obj->pages == NULL)

        goto cleanup;

    obj->has_dma_mapping = true;

    i915_gem_object_pin_pages(obj);

    obj->stolen = fb_node;

    obj->base.read_domains = I915_GEM_DOMAIN_GTT;

    obj->cache_level = I915_CACHE_NONE;

    obj->tiling_mode = I915_TILING_X;

    return obj;

cleanup:

    i915_gem_object_free(obj);

    return NULL;

}

struct drm_i915_gem_object *

kos_gem_fb_object_create(struct drm_device *dev,

                           u32 gtt_offset,

                           u32 size)

{

    struct drm_i915_private *dev_priv = dev->dev_private;

    struct i915_address_space *ggtt = &dev_priv->gtt.base;

    struct drm_i915_gem_object *obj;

    struct drm_mm_node *fb_node;

    struct i915_vma *vma;

    int ret;

    DRM_DEBUG_KMS("creating preallocated framebuffer object: gtt_offset=%x, size=%x\n",

                  gtt_offset, size);

    /* KISS and expect everything to be page-aligned */

    BUG_ON(size & 4095);

    if (WARN_ON(size == 0))

        return NULL;

    fb_node = kzalloc(sizeof(*fb_node), GFP_KERNEL);

    if (!fb_node)

        return NULL;

    fb_node->start = gtt_offset;

    fb_node->size = size;

    obj = _kos_fb_object_create(dev, fb_node);

    if (obj == NULL) {

        DRM_DEBUG_KMS("failed to preallocate framebuffer object\n");

        kfree(fb_node);

        return NULL;

    }

    vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);

    if (IS_ERR(vma)) {

        ret = PTR_ERR(vma);

        goto err_out;

    }

    /* To simplify the initialisation sequence between KMS and GTT,

     * we allow construction of the stolen object prior to

     * setting up the GTT space. The actual reservation will occur

     * later.

     */

    vma->node.start = gtt_offset;

    vma->node.size = size;

    if (drm_mm_initialized(&ggtt->mm)) {

        ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);

        if (ret) {

            DRM_DEBUG_KMS("failed to allocate framebuffer GTT space\n");

            goto err_vma;

        }

    }

//    obj->has_global_gtt_mapping = 1;

    list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);

    list_add_tail(&vma->mm_list, &ggtt->inactive_list);

    mutex_lock(&dev->object_name_lock);

    idr_preload(GFP_KERNEL);

    if (!obj->base.name) {

        ret = idr_alloc(&dev->object_name_idr, &obj->base, 1, 0, GFP_NOWAIT);

        if (ret < 0)

            goto err_gem;

        obj->base.name = ret;

        /* Allocate a reference for the name table.  */

        drm_gem_object_reference(&obj->base);

        DRM_DEBUG_KMS("%s allocate fb name %d\n", __FUNCTION__, obj->base.name );

    }

    idr_preload_end();

    mutex_unlock(&dev->object_name_lock);

    drm_gem_object_unreference(&obj->base);

    return obj;

err_gem:

    idr_preload_end();

    mutex_unlock(&dev->object_name_lock);

err_vma:

    i915_gem_vma_destroy(vma);

err_out:

    kfree(fb_node);

    drm_gem_object_unreference(&obj->base);

    return NULL;

}