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drm_agpsupport.c

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/**
 * \file drm_agpsupport.c
 * DRM support for AGP/GART backend
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * 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 "drmP.h"
#include <linux/module.h>

#if __OS_HAS_AGP

/**
 * Get AGP information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg pointer to a (output) drm_agp_info structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been initialized and acquired and fills in the
 * drm_agp_info structure with the information in drm_agp_head::agp_info.
 */
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;
}

/**
 * Acquire the AGP device.
 *
 * \param dev DRM device that is to acquire AGP.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device hasn't been acquired before and calls
 * \c agp_backend_acquire.
 */
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);

/**
 * Acquire the AGP device (ioctl).
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device hasn't been acquired before and calls
 * \c agp_backend_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->head->dev);
}

/**
 * Release the AGP device.
 *
 * \param dev DRM device that is to release AGP.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 */
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);
}

/**
 * Enable the AGP bus.
 *
 * \param dev DRM device that has previously acquired AGP.
 * \param mode Requested AGP mode.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired but not enabled, and calls
 * \c agp_enable.
 */
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->base = dev->agp->agp_info.aper_base;
      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);
}

/**
 * Allocate AGP memory.
 *
 * \param inode device inode.
 * \param file_priv file private pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired, allocates the
 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 */
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 = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
            return -ENOMEM;

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

      pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
      type = (u32) request->type;
      if (!(memory = drm_alloc_agp(dev, pages, type))) {
            drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
            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);
}

/**
 * Search for the AGP memory entry associated with a handle.
 *
 * \param dev DRM device structure.
 * \param handle AGP memory handle.
 * \return pointer to the drm_agp_mem structure associated with \p handle.
 *
 * Walks through drm_agp_head::memory until finding a matching handle.
 */
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;
}

/**
 * Unbind AGP memory from the GATT (ioctl).
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and acquired, looks-up the AGP memory
 * entry and passes it to the unbind_agp() function.
 */
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);
}

/**
 * Bind AGP memory into the GATT (ioctl)
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and that no memory
 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 * it to bind_agp() function.
 */
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);
}

/**
 * Free AGP memory (ioctl).
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and looks up the
 * AGP memory entry. If the memory it's currently bound, unbind it via
 * unbind_agp(). Frees it via free_agp() as well as the entry itself
 * and unlinks from the doubly linked list it's inserted in.
 */
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);
      drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
      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);
}

/**
 * Initialize the AGP resources.
 *
 * \return pointer to a drm_agp_head structure.
 *
 * Gets the drm_agp_t structure which is made available by the agpgart module
 * via the inter_module_* functions. Creates and initializes a drm_agp_head
 * structure.
 */
struct drm_agp_head *drm_agp_init(struct drm_device *dev)
{
      struct drm_agp_head *head = NULL;

      if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
            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))) {
                  drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
                  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) {
            drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
            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;

      return head;
}

/** Calls agp_allocate_memory() */
DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
                             size_t pages, u32 type)
{
      return agp_allocate_memory(bridge, pages, type);
}

/** Calls agp_free_memory() */
int drm_agp_free_memory(DRM_AGP_MEM * handle)
{
      if (!handle)
            return 0;
      agp_free_memory(handle);
      return 1;
}

/** Calls agp_bind_memory() */
int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
{
      if (!handle)
            return -EINVAL;
      return agp_bind_memory(handle, start);
}

/** Calls agp_unbind_memory() */
int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
{
      if (!handle)
            return -EINVAL;
      return agp_unbind_memory(handle);
}

#endif                        /* __OS_HAS_AGP */

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