drm_agpsupport.c

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/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * 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
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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 <drm/drmP.h>
#include <linux/module.h>
#include <linux/slab.h>

#if __OS_HAS_AGP

#include <asm/agp.h>

int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
{
    DRM_AGP_KERN *kern;

    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;

    kern = &dev->agp->agp_info;
    info->agp_version_major = kern->version.major;
    info->agp_version_minor = kern->version.minor;
    info->mode = kern->mode;
    info->aperture_base = kern->aper_base;
    info->aperture_size = kern->aper_size * 1024 * 1024;
    info->memory_allowed = kern->max_memory << PAGE_SHIFT;
    info->memory_used = kern->current_memory << PAGE_SHIFT;
    info->id_vendor = kern->device->vendor;
    info->id_device = kern->device->device;

    return 0;
}

EXPORT_SYMBOL(drm_agp_info);

int drm_agp_info_ioctl(struct drm_device *dev, void *data,
               struct drm_file *file_priv)
{
    struct drm_agp_info *info = data;
    int err;

    err = drm_agp_info(dev, info);
    if (err)
        return err;

    return 0;
}

int drm_agp_acquire(struct drm_device * dev)
{
    if (!dev->agp)
        return -ENODEV;
    if (dev->agp->acquired)
        return -EBUSY;
    if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
        return -ENODEV;
    dev->agp->acquired = 1;
    return 0;
}

EXPORT_SYMBOL(drm_agp_acquire);

int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
{
    return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
}

int drm_agp_release(struct drm_device * dev)
{
    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;
    agp_backend_release(dev->agp->bridge);
    dev->agp->acquired = 0;
    return 0;
}
EXPORT_SYMBOL(drm_agp_release);

int drm_agp_release_ioctl(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
{
    return drm_agp_release(dev);
}

int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
{
    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;

    dev->agp->mode = mode.mode;
    agp_enable(dev->agp->bridge, mode.mode);
    dev->agp->enabled = 1;
    return 0;
}

EXPORT_SYMBOL(drm_agp_enable);

int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    struct drm_agp_mode *mode = data;

    return drm_agp_enable(dev, *mode);
}

int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
{
    struct drm_agp_mem *entry;
    DRM_AGP_MEM *memory;
    unsigned long pages;
    u32 type;

    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;
    if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
        return -ENOMEM;

    memset(entry, 0, sizeof(*entry));

    pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
    type = (u32) request->type;
    if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
        kfree(entry);
        return -ENOMEM;
    }

    entry->handle = (unsigned long)memory->key + 1;
    entry->memory = memory;
    entry->bound = 0;
    entry->pages = pages;
    list_add(&entry->head, &dev->agp->memory);

    request->handle = entry->handle;
    request->physical = memory->physical;

    return 0;
}
EXPORT_SYMBOL(drm_agp_alloc);


int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
            struct drm_file *file_priv)
{
    struct drm_agp_buffer *request = data;

    return drm_agp_alloc(dev, request);
}

static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
                       unsigned long handle)
{
    struct drm_agp_mem *entry;

    list_for_each_entry(entry, &dev->agp->memory, head) {
        if (entry->handle == handle)
            return entry;
    }
    return NULL;
}

int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
{
    struct drm_agp_mem *entry;
    int ret;

    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;
    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
        return -EINVAL;
    if (!entry->bound)
        return -EINVAL;
    ret = drm_unbind_agp(entry->memory);
    if (ret == 0)
        entry->bound = 0;
    return ret;
}
EXPORT_SYMBOL(drm_agp_unbind);


int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
    struct drm_agp_binding *request = data;

    return drm_agp_unbind(dev, request);
}

int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
{
    struct drm_agp_mem *entry;
    int retcode;
    int page;

    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;
    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
        return -EINVAL;
    if (entry->bound)
        return -EINVAL;
    page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
    if ((retcode = drm_bind_agp(entry->memory, page)))
        return retcode;
    entry->bound = dev->agp->base + (page << PAGE_SHIFT);
    DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
          dev->agp->base, entry->bound);
    return 0;
}
EXPORT_SYMBOL(drm_agp_bind);


int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
               struct drm_file *file_priv)
{
    struct drm_agp_binding *request = data;

    return drm_agp_bind(dev, request);
}

int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
{
    struct drm_agp_mem *entry;

    if (!dev->agp || !dev->agp->acquired)
        return -EINVAL;
    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
        return -EINVAL;
    if (entry->bound)
        drm_unbind_agp(entry->memory);

    list_del(&entry->head);

    drm_free_agp(entry->memory, entry->pages);
    kfree(entry);
    return 0;
}
EXPORT_SYMBOL(drm_agp_free);



int drm_agp_free_ioctl(struct drm_device *dev, void *data,
               struct drm_file *file_priv)
{
    struct drm_agp_buffer *request = data;

    return drm_agp_free(dev, request);
}

struct drm_agp_head *drm_agp_init(struct drm_device *dev)
{
    struct drm_agp_head *head = NULL;

    if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
        return NULL;
    memset((void *)head, 0, sizeof(*head));
    head->bridge = agp_find_bridge(dev->pdev);
    if (!head->bridge) {
        if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
            kfree(head);
            return NULL;
        }
        agp_copy_info(head->bridge, &head->agp_info);
        agp_backend_release(head->bridge);
    } else {
        agp_copy_info(head->bridge, &head->agp_info);
    }
    if (head->agp_info.chipset == NOT_SUPPORTED) {
        kfree(head);
        return NULL;
    }
    INIT_LIST_HEAD(&head->memory);
    head->cant_use_aperture = head->agp_info.cant_use_aperture;
    head->page_mask = head->agp_info.page_mask;
    head->base = head->agp_info.aper_base;
    return head;
}

DRM_AGP_MEM *
drm_agp_bind_pages(struct drm_device *dev,
           struct page **pages,
           unsigned long num_pages,
           uint32_t gtt_offset,
           u32 type)
{
    DRM_AGP_MEM *mem;
    int ret, i;

    DRM_DEBUG("\n");

    mem = agp_allocate_memory(dev->agp->bridge, num_pages,
                      type);
    if (mem == NULL) {
        DRM_ERROR("Failed to allocate memory for %ld pages\n",
              num_pages);
        return NULL;
    }

    for (i = 0; i < num_pages; i++)
        mem->pages[i] = pages[i];
    mem->page_count = num_pages;

    mem->is_flushed = true;
    ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
    if (ret != 0) {
        DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
        agp_free_memory(mem);
        return NULL;
    }

    return mem;
}
EXPORT_SYMBOL(drm_agp_bind_pages);

#endif /* __OS_HAS_AGP */