drm_vm.c revision 1.1.2.4
1 /* $NetBSD: drm_vm.c,v 1.1.2.4 2014/01/22 16:40:44 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: drm_vm.c,v 1.1.2.4 2014/01/22 16:40:44 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/conf.h> 37 38 #include <uvm/uvm_extern.h> 39 #include <uvm/uvm_device.h> 40 41 #include <drm/drmP.h> 42 43 static paddr_t drm_mmap_paddr_locked(struct drm_device *, off_t, int); 44 static paddr_t drm_mmap_dma_paddr(struct drm_device *, off_t, int); 45 static paddr_t drm_mmap_map_paddr(struct drm_device *, struct drm_local_map *, 46 off_t, int); 47 48 extern struct cdevsw drm_cdevsw; /* XXX */ 49 50 int 51 drm_mmap_object(struct drm_device *dev, off_t offset, size_t size, int prot, 52 struct uvm_object **uobjp) 53 { 54 dev_t devno = cdevsw_lookup_major(&drm_cdevsw); 55 struct uvm_object *uobj; 56 57 uobj = udv_attach(&devno, prot, offset, size); 58 if (uobj == NULL) 59 return -EINVAL; 60 61 *uobjp = uobj; 62 return 0; 63 } 64 65 paddr_t 66 drm_mmap_paddr(struct drm_device *dev, off_t byte_offset, int prot) 67 { 68 paddr_t paddr; 69 70 mutex_lock(&dev->struct_mutex); 71 paddr = drm_mmap_paddr_locked(dev, byte_offset, prot); 72 mutex_unlock(&dev->struct_mutex); 73 74 return paddr; 75 } 76 77 static paddr_t 78 drm_mmap_paddr_locked(struct drm_device *dev, off_t byte_offset, int prot) 79 { 80 const off_t page_offset = (byte_offset >> PAGE_SHIFT); 81 struct drm_hash_item *hash; 82 83 KASSERT(mutex_is_locked(&dev->struct_mutex)); 84 85 if (byte_offset != (byte_offset & ~(PAGE_SIZE-1))) 86 return -1; 87 88 if ((dev->dma != NULL) && 89 (0 <= byte_offset) && 90 (byte_offset <= (dev->dma->page_count << PAGE_SHIFT))) 91 return drm_mmap_dma_paddr(dev, byte_offset, prot); 92 93 if (drm_ht_find_item(&dev->map_hash, page_offset, &hash)) 94 return -1; 95 96 struct drm_local_map *const map = drm_hash_entry(hash, 97 struct drm_map_list, hash)->map; 98 if (map == NULL) 99 return -1; 100 101 /* 102 * XXX FreeBSD drops the mutex at this point, which would be 103 * nice, to allow sleeping in bus_dma cruft, but I don't know 104 * what guarantees the map will continue to exist. 105 */ 106 107 if (ISSET(map->flags, _DRM_RESTRICTED) && !DRM_SUSER()) 108 return -1; 109 110 if (byte_offset < map->offset) 111 return -1; 112 113 return drm_mmap_map_paddr(dev, map, (map->offset - byte_offset), 114 prot); 115 } 116 117 static paddr_t 118 drm_mmap_dma_paddr(struct drm_device *dev, off_t byte_offset, int prot) 119 { 120 const off_t page_offset = (byte_offset >> PAGE_SHIFT); 121 122 KASSERT(mutex_is_locked(&dev->struct_mutex)); 123 124 if (dev->dma->pagelist == NULL) 125 return (paddr_t)-1; 126 127 if (page_offset >= dev->dma->page_count) 128 return (paddr_t)-1; 129 130 return dev->dma->pagelist[page_offset]; 131 } 132 133 static paddr_t 134 drm_mmap_map_paddr(struct drm_device *dev, struct drm_local_map *map, 135 off_t byte_offset, int prot) 136 { 137 int flags = 0; 138 139 switch (map->type) { 140 case _DRM_FRAME_BUFFER: 141 case _DRM_AGP: 142 flags |= BUS_SPACE_MAP_PREFETCHABLE; 143 /* Fall through. */ 144 145 case _DRM_REGISTERS: 146 flags |= BUS_SPACE_MAP_LINEAR; /* XXX Why? */ 147 148 return bus_space_mmap(dev->bst, map->offset, byte_offset, prot, 149 flags); 150 151 case _DRM_CONSISTENT: { 152 struct drm_dma_handle *const dmah = map->lm_data.dmah; 153 154 return bus_dmamem_mmap(dev->dmat, &dmah->dmah_seg, 1, 155 byte_offset, prot, 156 /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ 157 /* XXX What else? BUS_DMA_COHERENT? */ 158 (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); 159 } 160 161 case _DRM_SCATTER_GATHER: { 162 struct drm_sg_mem *const sg = dev->sg; 163 164 #if 0 /* XXX */ 165 KASSERT(sg == map->lm_data.sg); 166 #endif 167 168 return bus_dmamem_mmap(dev->dmat, sg->sg_segs, sg->sg_nsegs, 169 byte_offset, prot, 170 /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ 171 /* XXX What else? BUS_DMA_COHERENT? */ 172 (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); 173 } 174 175 case _DRM_SHM: 176 case _DRM_GEM: 177 default: 178 return (paddr_t)-1; 179 } 180 } 181
Indexes created Mon Oct 13 08:09:50 GMT 2025