FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_vm.c

     /*-
      * Copyright 2003 Eric Anholt
      * 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
     * ERIC ANHOLT 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: releng/6.4/sys/dev/drm/drm_vm.c 153401 2005-12-14 00:52:59Z anholt $");
    
    #include "dev/drm/drmP.h"
    #include "dev/drm/drm.h"
    
    #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
    int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
        int prot)
    #elif defined(__FreeBSD__)
    int drm_mmap(dev_t kdev, vm_offset_t offset, int prot)
    #elif defined(__NetBSD__) || defined(__OpenBSD__)
    paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
    #endif
    {
            DRM_DEVICE;
            drm_local_map_t *map;
            drm_file_t *priv;
            drm_map_type_t type;
    #ifdef __FreeBSD__
            vm_paddr_t phys;
    #else
            paddr_t phys;
    #endif
    
            DRM_LOCK();
            priv = drm_find_file_by_proc(dev, DRM_CURPROC);
            DRM_UNLOCK();
            if (priv == NULL) {
                    DRM_ERROR("can't find authenticator\n");
                    return EINVAL;
            }
    
            if (!priv->authenticated)
                    return DRM_ERR(EACCES);
    
            if (dev->dma && offset >= 0 && 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];
    
    #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
                            *paddr = phys;
                            DRM_SPINUNLOCK(&dev->dma_lock);
                            return 0;
    #else
                            return atop(phys);
    #endif
                    } else {
                            DRM_SPINUNLOCK(&dev->dma_lock);
                            return -1;
                    }
                    DRM_SPINUNLOCK(&dev->dma_lock);
            }
    
                                    /* 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();
            TAILQ_FOREACH(map, &dev->maplist, link) {
                    if (offset >= map->offset && offset < map->offset + map->size)
                            break;
            }
    
            if (map == NULL) {
                    DRM_UNLOCK();
                    DRM_DEBUG("can't find map\n");
                    return -1;
           }
           if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
                   DRM_UNLOCK();
                   DRM_DEBUG("restricted map\n");
                   return -1;
           }
           type = map->type;
           DRM_UNLOCK();
   
           switch (type) {
           case _DRM_FRAME_BUFFER:
           case _DRM_REGISTERS:
           case _DRM_AGP:
                   phys = offset;
                   break;
           case _DRM_CONSISTENT:
                   phys = vtophys((char *)map->handle + (offset - map->offset));
                   break;
           case _DRM_SCATTER_GATHER:
           case _DRM_SHM:
                   phys = vtophys(offset);
                   break;
           default:
                   DRM_ERROR("bad map type %d\n", type);
                   return -1;      /* This should never happen. */
           }
   
   #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
           *paddr = phys;
           return 0;
   #else
           return atop(phys);
   #endif
   }
   

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