drm_vm.c revision 145132
1145132Sanholt/*- 2145132Sanholt * Copyright 2003 Eric Anholt 3145132Sanholt * All Rights Reserved. 4145132Sanholt * 5145132Sanholt * Permission is hereby granted, free of charge, to any person obtaining a 6145132Sanholt * copy of this software and associated documentation files (the "Software"), 7145132Sanholt * to deal in the Software without restriction, including without limitation 8145132Sanholt * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9145132Sanholt * and/or sell copies of the Software, and to permit persons to whom the 10145132Sanholt * Software is furnished to do so, subject to the following conditions: 11145132Sanholt * 12145132Sanholt * The above copyright notice and this permission notice (including the next 13145132Sanholt * paragraph) shall be included in all copies or substantial portions of the 14145132Sanholt * Software. 15145132Sanholt * 16145132Sanholt * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17145132Sanholt * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18145132Sanholt * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19145132Sanholt * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 20145132Sanholt * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21145132Sanholt * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22145132Sanholt * 23145132Sanholt * $FreeBSD: head/sys/dev/drm/drm_vm.c 145132 2005-04-16 03:44:47Z anholt $ 24145132Sanholt */ 25145132Sanholt 26145132Sanholt#include "dev/drm/drmP.h" 27145132Sanholt#include "dev/drm/drm.h" 28145132Sanholt 29145132Sanholt#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 30145132Sanholtint drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 31145132Sanholt int prot) 32145132Sanholt#elif defined(__FreeBSD__) 33145132Sanholtint drm_mmap(dev_t kdev, vm_offset_t offset, int prot) 34145132Sanholt#elif defined(__NetBSD__) || defined(__OpenBSD__) 35145132Sanholtpaddr_t drm_mmap(dev_t kdev, off_t offset, int prot) 36145132Sanholt#endif 37145132Sanholt{ 38145132Sanholt DRM_DEVICE; 39145132Sanholt drm_local_map_t *map; 40145132Sanholt drm_file_t *priv; 41145132Sanholt drm_map_type_t type; 42145132Sanholt 43145132Sanholt DRM_LOCK(); 44145132Sanholt priv = drm_find_file_by_proc(dev, DRM_CURPROC); 45145132Sanholt DRM_UNLOCK(); 46145132Sanholt if (priv == NULL) { 47145132Sanholt DRM_ERROR("can't find authenticator\n"); 48145132Sanholt return EINVAL; 49145132Sanholt } 50145132Sanholt 51145132Sanholt if (!priv->authenticated) 52145132Sanholt return DRM_ERR(EACCES); 53145132Sanholt 54145132Sanholt DRM_SPINLOCK(&dev->dma_lock); 55145132Sanholt if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) { 56145132Sanholt drm_device_dma_t *dma = dev->dma; 57145132Sanholt 58145132Sanholt if (dma->pagelist != NULL) { 59145132Sanholt unsigned long page = offset >> PAGE_SHIFT; 60145132Sanholt unsigned long phys = dma->pagelist[page]; 61145132Sanholt 62145132Sanholt#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 63145132Sanholt *paddr = phys; 64145132Sanholt DRM_SPINUNLOCK(&dev->dma_lock); 65145132Sanholt return 0; 66145132Sanholt#else 67145132Sanholt return atop(phys); 68145132Sanholt#endif 69145132Sanholt } else { 70145132Sanholt DRM_SPINUNLOCK(&dev->dma_lock); 71145132Sanholt return -1; 72145132Sanholt } 73145132Sanholt } 74145132Sanholt DRM_SPINUNLOCK(&dev->dma_lock); 75145132Sanholt 76145132Sanholt /* A sequential search of a linked list is 77145132Sanholt fine here because: 1) there will only be 78145132Sanholt about 5-10 entries in the list and, 2) a 79145132Sanholt DRI client only has to do this mapping 80145132Sanholt once, so it doesn't have to be optimized 81145132Sanholt for performance, even if the list was a 82145132Sanholt bit longer. */ 83145132Sanholt DRM_LOCK(); 84145132Sanholt TAILQ_FOREACH(map, &dev->maplist, link) { 85145132Sanholt if (offset >= map->offset && offset < map->offset + map->size) 86145132Sanholt break; 87145132Sanholt } 88145132Sanholt 89145132Sanholt if (map == NULL) { 90145132Sanholt DRM_UNLOCK(); 91145132Sanholt DRM_DEBUG("can't find map\n"); 92145132Sanholt return -1; 93145132Sanholt } 94145132Sanholt if (((map->flags&_DRM_RESTRICTED) && DRM_SUSER(DRM_CURPROC))) { 95145132Sanholt DRM_UNLOCK(); 96145132Sanholt DRM_DEBUG("restricted map\n"); 97145132Sanholt return -1; 98145132Sanholt } 99145132Sanholt type = map->type; 100145132Sanholt DRM_UNLOCK(); 101145132Sanholt 102145132Sanholt switch (type) { 103145132Sanholt case _DRM_FRAME_BUFFER: 104145132Sanholt case _DRM_REGISTERS: 105145132Sanholt case _DRM_AGP: 106145132Sanholt#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 107145132Sanholt *paddr = offset; 108145132Sanholt return 0; 109145132Sanholt#else 110145132Sanholt return atop(offset); 111145132Sanholt#endif 112145132Sanholt case _DRM_SCATTER_GATHER: 113145132Sanholt case _DRM_SHM: 114145132Sanholt#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 115145132Sanholt *paddr = vtophys(offset); 116145132Sanholt return 0; 117145132Sanholt#else 118145132Sanholt return atop(vtophys(offset)); 119145132Sanholt#endif 120145132Sanholt default: 121145132Sanholt return -1; /* This should never happen. */ 122145132Sanholt } 123145132Sanholt DRM_DEBUG("bailing out\n"); 124145132Sanholt 125145132Sanholt return -1; 126145132Sanholt} 127145132Sanholt 128