text: /**
   * \file drm_vm.c
   * Memory mapping for DRM
   *
   * \author Rickard E. (Rik) Faith <faith@valinux.com>
   * \author Gareth Hughes <gareth@valinux.com>
   */
  
  /*
   * Created: Mon Jan  4 08:58:31 1999 by faith@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("$FreeBSD$");
  
  /** @file drm_vm.c
   * Support code for mmaping of DRM maps.
   */
  
  #include <dev/drm2/drmP.h>
  #include <dev/drm2/drm.h>
  
  #ifdef FREEBSD_NOTYET
  int
  drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
      int prot, vm_memattr_t *memattr)
  {
  	struct drm_device *dev = drm_get_device_from_kdev(kdev);
  	struct drm_file *file_priv = NULL;
  	drm_local_map_t *map;
  	enum drm_map_type type;
  	vm_paddr_t phys;
  	int error;
  
  	/* d_mmap gets called twice, we can only reference file_priv during
  	 * the first call.  We need to assume that if error is EBADF the
  	 * call was successful and the client is authenticated.
  	 */
  	error = devfs_get_cdevpriv((void **)&file_priv);
  	if (error == ENOENT) {
  		DRM_ERROR("Could not find authenticator!\n");
  		return EINVAL;
  	}
  
  	if (file_priv && !file_priv->authenticated)
  		return EACCES;
  
  	DRM_DEBUG("called with offset %016jx\n", offset);
  	if (dev->dma && offset < ptoa(dev->dma->page_count)) {
  		drm_device_dma_t *dma = dev->dma;
  
  		DRM_SPINLOCK(&dev->dma_lock);
  
  		if (dma->pagelist != NULL) {
  			unsigned long page = offset >> PAGE_SHIFT;
  			unsigned long phys = dma->pagelist[page];
  
  			DRM_SPINUNLOCK(&dev->dma_lock);
  			*paddr = phys;
  			return 0;
  		} else {
  			DRM_SPINUNLOCK(&dev->dma_lock);
  			return -1;
  		}
  	}
  
  	/* A sequential search of a linked list is
  	   fine here because: 1) there will only be
  	   about 5-10 entries in the list and, 2) a
  	   DRI client only has to do this mapping
  	   once, so it doesn't have to be optimized
  	   for performance, even if the list was a
  	   bit longer.
  	*/
  	DRM_LOCK(dev);
  	TAILQ_FOREACH(map, &dev->maplist, link) {
  		if (offset >> DRM_MAP_HANDLE_SHIFT ==
  		    (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
  			break;
  	}
  
  	if (map == NULL) {
  		DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
  		TAILQ_FOREACH(map, &dev->maplist, link) {
  			DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
  			    map->offset, (unsigned long)map->handle);
  		}
  		DRM_UNLOCK(dev);
  		return -1;
  	}
  	if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
  		DRM_UNLOCK(dev);
  		DRM_DEBUG("restricted map\n");
  		return -1;
  	}
  	type = map->type;
  	DRM_UNLOCK(dev);
  
  	offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
  
  	switch (type) {
  	case _DRM_FRAME_BUFFER:
  	case _DRM_AGP:
  		*memattr = VM_MEMATTR_WRITE_COMBINING;
  		/* FALLTHROUGH */
  	case _DRM_REGISTERS:
  		phys = map->offset + offset;
  		break;
  	case _DRM_SCATTER_GATHER:
  		*memattr = VM_MEMATTR_WRITE_COMBINING;
  		/* FALLTHROUGH */
  	case _DRM_CONSISTENT:
  	case _DRM_SHM:
  		phys = vtophys((char *)map->virtual + offset);
  		break;
  	default:
  		DRM_ERROR("bad map type %d\n", type);
  		return -1;	/* This should never happen. */
  	}
  
  	*paddr = phys;
  	return 0;
  }
  #endif /* FREEBSD_NOTYET */
  