/* $NetBSD: drm_vm.c,v 1.15 2008/06/29 12:49:08 jmcneill Exp $ */ /*- * 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 __KERNEL_RCSID(0, "$NetBSD: drm_vm.c,v 1.15 2008/06/29 12:49:08 jmcneill Exp $"); /* __FBSDID("$FreeBSD: src/sys/dev/drm/drm_vm.c,v 1.2 2005/11/28 23:13:53 anholt Exp $"); */ #include "drmP.h" #include "drm.h" /* WARNING: pure, unadulterated EVIL ahead! */ paddr_t drm_mmap(dev_t kdev, off_t offset, int prot) { DRM_DEVICE; drm_local_map_t *map; drm_file_t *priv; drm_map_type_t type; paddr_t phys; uintptr_t roffset; DRM_LOCK(); priv = drm_find_file_by_proc(dev, DRM_CURPROC); DRM_UNLOCK(); if (priv == NULL) { DRM_ERROR("can't find authenticator\n"); return -1; } if (!priv->authenticated) return -1; 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 pphys = dma->pagelist[page]; #ifdef macppc return pphys; #else return atop(pphys); #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(); roffset = DRM_NETBSD_HANDLE2ADDR(offset); TAILQ_FOREACH(map, &dev->maplist, link) { if (map->type == _DRM_SHM) { if (roffset >= (uintptr_t)map->handle && roffset < (uintptr_t)map->handle + map->size) break; } else { 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((paddr_t)map->handle + (offset - map->offset)); break; case _DRM_SCATTER_GATHER: phys = vtophys(offset); break; case _DRM_SHM: phys = vtophys(DRM_NETBSD_HANDLE2ADDR(offset)); break; default: DRM_ERROR("bad map type %d\n", type); return -1; /* This should never happen. */ } #ifdef macppc return phys; #else return atop(phys); #endif }