/*
* 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 <eric@anholt.net>
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#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_vma_create(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;
}