drm_vm.c revision 145132
190075Sobrien/*- 290075Sobrien * Copyright 2003 Eric Anholt 390075Sobrien * All Rights Reserved. 490075Sobrien * 590075Sobrien * Permission is hereby granted, free of charge, to any person obtaining a 690075Sobrien * copy of this software and associated documentation files (the "Software"), 790075Sobrien * to deal in the Software without restriction, including without limitation 890075Sobrien * the rights to use, copy, modify, merge, publish, distribute, sublicense, 990075Sobrien * and/or sell copies of the Software, and to permit persons to whom the 1090075Sobrien * Software is furnished to do so, subject to the following conditions: 1190075Sobrien * 1290075Sobrien * The above copyright notice and this permission notice (including the next 1390075Sobrien * paragraph) shall be included in all copies or substantial portions of the 1490075Sobrien * Software. 1590075Sobrien * 1690075Sobrien * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1790075Sobrien * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1890075Sobrien * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 1990075Sobrien * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 2090075Sobrien * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 2190075Sobrien * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 2290075Sobrien * 2390075Sobrien * $FreeBSD: head/sys/dev/drm/drm_vm.c 145132 2005-04-16 03:44:47Z anholt $ 2490075Sobrien */ 2590075Sobrien 2690075Sobrien#include "dev/drm/drmP.h" 2790075Sobrien#include "dev/drm/drm.h" 2890075Sobrien 2990075Sobrien#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 3090075Sobrienint drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 3190075Sobrien int prot) 3290075Sobrien#elif defined(__FreeBSD__) 3390075Sobrienint drm_mmap(dev_t kdev, vm_offset_t offset, int prot) 3490075Sobrien#elif defined(__NetBSD__) || defined(__OpenBSD__) 3590075Sobrienpaddr_t drm_mmap(dev_t kdev, off_t offset, int prot) 3690075Sobrien#endif 3790075Sobrien{ 3890075Sobrien DRM_DEVICE; 3990075Sobrien drm_local_map_t *map; 4090075Sobrien drm_file_t *priv; 4190075Sobrien drm_map_type_t type; 4290075Sobrien 4390075Sobrien DRM_LOCK(); 4490075Sobrien priv = drm_find_file_by_proc(dev, DRM_CURPROC); 4590075Sobrien DRM_UNLOCK(); 4690075Sobrien if (priv == NULL) { 4790075Sobrien DRM_ERROR("can't find authenticator\n"); 4890075Sobrien return EINVAL; 4990075Sobrien } 5090075Sobrien 5190075Sobrien if (!priv->authenticated) 5290075Sobrien return DRM_ERR(EACCES); 5390075Sobrien 5490075Sobrien DRM_SPINLOCK(&dev->dma_lock); 5590075Sobrien if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) { 5690075Sobrien drm_device_dma_t *dma = dev->dma; 5790075Sobrien 5890075Sobrien if (dma->pagelist != NULL) { 5990075Sobrien unsigned long page = offset >> PAGE_SHIFT; 6090075Sobrien unsigned long phys = dma->pagelist[page]; 6190075Sobrien 6290075Sobrien#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 6390075Sobrien *paddr = phys; 6490075Sobrien DRM_SPINUNLOCK(&dev->dma_lock); 6590075Sobrien return 0; 6690075Sobrien#else 6790075Sobrien return atop(phys); 6890075Sobrien#endif 6990075Sobrien } else { 7090075Sobrien DRM_SPINUNLOCK(&dev->dma_lock); 7190075Sobrien return -1; 7290075Sobrien } 7390075Sobrien } 7490075Sobrien DRM_SPINUNLOCK(&dev->dma_lock); 7590075Sobrien 7690075Sobrien /* A sequential search of a linked list is 7790075Sobrien fine here because: 1) there will only be 7890075Sobrien about 5-10 entries in the list and, 2) a 7990075Sobrien DRI client only has to do this mapping 8090075Sobrien once, so it doesn't have to be optimized 8190075Sobrien for performance, even if the list was a 8290075Sobrien bit longer. */ 8390075Sobrien DRM_LOCK(); 8490075Sobrien TAILQ_FOREACH(map, &dev->maplist, link) { 8590075Sobrien if (offset >= map->offset && offset < map->offset + map->size) 8690075Sobrien break; 8790075Sobrien } 8890075Sobrien 8990075Sobrien if (map == NULL) { 9090075Sobrien DRM_UNLOCK(); 9190075Sobrien DRM_DEBUG("can't find map\n"); 9290075Sobrien return -1; 9390075Sobrien } 9490075Sobrien if (((map->flags&_DRM_RESTRICTED) && DRM_SUSER(DRM_CURPROC))) { 9590075Sobrien DRM_UNLOCK(); 9690075Sobrien DRM_DEBUG("restricted map\n"); 9790075Sobrien return -1; 9890075Sobrien } 9990075Sobrien type = map->type; 10090075Sobrien DRM_UNLOCK(); 10190075Sobrien 10290075Sobrien switch (type) { 10390075Sobrien case _DRM_FRAME_BUFFER: 10490075Sobrien case _DRM_REGISTERS: 10590075Sobrien case _DRM_AGP: 10690075Sobrien#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 10790075Sobrien *paddr = offset; 10890075Sobrien return 0; 10990075Sobrien#else 11090075Sobrien return atop(offset); 11190075Sobrien#endif 11290075Sobrien case _DRM_SCATTER_GATHER: 11390075Sobrien case _DRM_SHM: 11490075Sobrien#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 11590075Sobrien *paddr = vtophys(offset); 11690075Sobrien return 0; 11790075Sobrien#else 11890075Sobrien return atop(vtophys(offset)); 11990075Sobrien#endif 12090075Sobrien default: 12190075Sobrien return -1; /* This should never happen. */ 12290075Sobrien } 12390075Sobrien DRM_DEBUG("bailing out\n"); 12490075Sobrien 12590075Sobrien return -1; 12690075Sobrien} 12790075Sobrien 12890075Sobrien