FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_agpsupport.c

     /**
      * \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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <dev/drm2/drmP.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;
            agp_get_info(dev->agp->bridge, kern);
            info->agp_version_major = 1;
            info->agp_version_minor = 0;
            info->mode              = kern->ai_mode;
            info->aperture_base     = kern->ai_aperture_base;
            info->aperture_size     = kern->ai_aperture_size;
            info->memory_allowed    = kern->ai_memory_allowed;
            info->memory_used       = kern->ai_memory_used;
            info->id_vendor         = kern->ai_devid & 0xffff;
            info->id_device         = kern->ai_devid >> 16;
    
            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)
   {
           int retcode;
   
           if (!dev->agp)
                   return -ENODEV;
           if (dev->agp->acquired)
                   return -EBUSY;
           retcode = agp_acquire(dev->agp->bridge);
           if (retcode)
                   return -retcode;
           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->minor->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_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->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 agp_allocate_memory() 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;
           struct agp_memory_info info;
   
           if (!dev->agp || !dev->agp->acquired)
                   return -EINVAL;
           if (!(entry = malloc(sizeof(*entry), DRM_MEM_AGPLISTS, M_NOWAIT)))
                   return -ENOMEM;
   
           memset(entry, 0, sizeof(*entry));
   
           pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
           type = (u32) request->type;
           if (!(memory = agp_alloc_memory(dev->agp->bridge, type, pages << PAGE_SHIFT))) {
                   free(entry, DRM_MEM_AGPLISTS);
                   return -ENOMEM;
           }
   
           entry->handle = (unsigned long)memory;
           entry->memory = memory;
           entry->bound = 0;
           entry->pages = pages;
           list_add(&entry->head, &dev->agp->memory);
   
           agp_memory_info(dev->agp->bridge, entry->memory, &info);
   
           request->handle = entry->handle;
           request->physical = info.ami_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);
           free(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 = malloc(sizeof(*head), DRM_MEM_AGPLISTS, M_NOWAIT)))
                   return NULL;
           memset((void *)head, 0, sizeof(*head));
           head->bridge = agp_find_device();
           if (!head->bridge) {
                   free(head, DRM_MEM_AGPLISTS);
                   return NULL;
           } else {
                   agp_get_info(head->bridge, &head->agp_info);
           }
           INIT_LIST_HEAD(&head->memory);
           head->cant_use_aperture = 0;
           head->base = head->agp_info.ai_aperture_base;
           return head;
   }
   
   #ifdef FREEBSD_NOTYET
   /**
    * Binds a collection of pages into AGP memory at the given offset, returning
    * the AGP memory structure containing them.
    *
    * No reference is held on the pages during this time -- it is up to the
    * caller to handle that.
    */
   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 /* FREEBSD_NOTYET */
   
   #endif /* __OS_HAS_AGP */

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