drm_vm.c revision 1.5.4.3
1 1.5.4.2 tls /* $NetBSD: drm_vm.c,v 1.5.4.3 2017/12/03 11:37:58 jdolecek Exp $ */ 2 1.5.4.2 tls 3 1.5.4.2 tls /*- 4 1.5.4.2 tls * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.5.4.2 tls * All rights reserved. 6 1.5.4.2 tls * 7 1.5.4.2 tls * This code is derived from software contributed to The NetBSD Foundation 8 1.5.4.2 tls * by Taylor R. Campbell. 9 1.5.4.2 tls * 10 1.5.4.2 tls * Redistribution and use in source and binary forms, with or without 11 1.5.4.2 tls * modification, are permitted provided that the following conditions 12 1.5.4.2 tls * are met: 13 1.5.4.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.5.4.2 tls * notice, this list of conditions and the following disclaimer. 15 1.5.4.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.5.4.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.5.4.2 tls * documentation and/or other materials provided with the distribution. 18 1.5.4.2 tls * 19 1.5.4.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.5.4.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.5.4.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.5.4.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.5.4.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.5.4.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.5.4.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.5.4.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.5.4.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.5.4.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.5.4.2 tls * POSSIBILITY OF SUCH DAMAGE. 30 1.5.4.2 tls */ 31 1.5.4.2 tls 32 1.5.4.2 tls #include <sys/cdefs.h> 33 1.5.4.2 tls __KERNEL_RCSID(0, "$NetBSD: drm_vm.c,v 1.5.4.3 2017/12/03 11:37:58 jdolecek Exp $"); 34 1.5.4.2 tls 35 1.5.4.2 tls #include <sys/types.h> 36 1.5.4.2 tls #include <sys/conf.h> 37 1.5.4.2 tls 38 1.5.4.2 tls #include <uvm/uvm_extern.h> 39 1.5.4.2 tls #include <uvm/uvm_device.h> 40 1.5.4.2 tls 41 1.5.4.2 tls #include <drm/drmP.h> 42 1.5.4.2 tls 43 1.5.4.2 tls static paddr_t drm_mmap_paddr_locked(struct drm_device *, off_t, int); 44 1.5.4.2 tls static paddr_t drm_mmap_dma_paddr(struct drm_device *, off_t, int); 45 1.5.4.2 tls static paddr_t drm_mmap_map_paddr(struct drm_device *, struct drm_local_map *, 46 1.5.4.2 tls off_t, int); 47 1.5.4.2 tls 48 1.5.4.2 tls int 49 1.5.4.2 tls drm_mmap_object(struct drm_device *dev, off_t offset, size_t size, int prot, 50 1.5.4.2 tls struct uvm_object **uobjp, voff_t *uoffsetp, struct file *file __unused) 51 1.5.4.2 tls { 52 1.5.4.3 jdolecek devmajor_t maj = cdevsw_lookup_major(&drm_cdevsw); 53 1.5.4.3 jdolecek dev_t devno = makedev(maj, dev->primary->index); 54 1.5.4.2 tls struct uvm_object *uobj; 55 1.5.4.2 tls 56 1.5.4.2 tls KASSERT(offset == (offset & ~(PAGE_SIZE-1))); 57 1.5.4.2 tls 58 1.5.4.2 tls /* 59 1.5.4.2 tls * Attach the device. The size and offset are used only for 60 1.5.4.2 tls * access checks; offset does not become a base address for the 61 1.5.4.2 tls * subsequent uvm_map, hence we set *uoffsetp to offset, not 0. 62 1.5.4.2 tls */ 63 1.5.4.3 jdolecek uobj = udv_attach(devno, prot, offset, size); 64 1.5.4.2 tls if (uobj == NULL) 65 1.5.4.2 tls return -EINVAL; 66 1.5.4.2 tls 67 1.5.4.2 tls *uobjp = uobj; 68 1.5.4.2 tls *uoffsetp = offset; 69 1.5.4.2 tls return 0; 70 1.5.4.2 tls } 71 1.5.4.2 tls 72 1.5.4.2 tls paddr_t 73 1.5.4.2 tls drm_mmap_paddr(struct drm_device *dev, off_t byte_offset, int prot) 74 1.5.4.2 tls { 75 1.5.4.2 tls paddr_t paddr; 76 1.5.4.2 tls 77 1.5.4.2 tls if (byte_offset != (byte_offset & ~(PAGE_SIZE-1))) 78 1.5.4.2 tls return -1; 79 1.5.4.2 tls 80 1.5.4.2 tls mutex_lock(&dev->struct_mutex); 81 1.5.4.2 tls paddr = drm_mmap_paddr_locked(dev, byte_offset, prot); 82 1.5.4.2 tls mutex_unlock(&dev->struct_mutex); 83 1.5.4.2 tls 84 1.5.4.2 tls return paddr; 85 1.5.4.2 tls } 86 1.5.4.2 tls 87 1.5.4.2 tls static paddr_t 88 1.5.4.2 tls drm_mmap_paddr_locked(struct drm_device *dev, off_t byte_offset, int prot) 89 1.5.4.2 tls { 90 1.5.4.2 tls const off_t page_offset = (byte_offset >> PAGE_SHIFT); 91 1.5.4.2 tls struct drm_hash_item *hash; 92 1.5.4.2 tls 93 1.5.4.2 tls KASSERT(mutex_is_locked(&dev->struct_mutex)); 94 1.5.4.2 tls KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); 95 1.5.4.2 tls 96 1.5.4.2 tls if ((dev->dma != NULL) && 97 1.5.4.2 tls (0 <= byte_offset) && 98 1.5.4.2 tls (page_offset <= dev->dma->page_count)) 99 1.5.4.2 tls return drm_mmap_dma_paddr(dev, byte_offset, prot); 100 1.5.4.2 tls 101 1.5.4.2 tls if (drm_ht_find_item(&dev->map_hash, page_offset, &hash)) 102 1.5.4.2 tls return -1; 103 1.5.4.2 tls 104 1.5.4.2 tls struct drm_local_map *const map = drm_hash_entry(hash, 105 1.5.4.2 tls struct drm_map_list, hash)->map; 106 1.5.4.2 tls if (map == NULL) 107 1.5.4.2 tls return -1; 108 1.5.4.2 tls 109 1.5.4.2 tls /* 110 1.5.4.2 tls * XXX FreeBSD drops the mutex at this point, which would be 111 1.5.4.2 tls * nice, to allow sleeping in bus_dma cruft, but I don't know 112 1.5.4.2 tls * what guarantees the map will continue to exist. 113 1.5.4.2 tls */ 114 1.5.4.2 tls 115 1.5.4.2 tls if (ISSET(map->flags, _DRM_RESTRICTED) && !DRM_SUSER()) 116 1.5.4.2 tls return -1; 117 1.5.4.2 tls 118 1.5.4.2 tls if (!(map->offset <= byte_offset)) 119 1.5.4.2 tls return -1; 120 1.5.4.2 tls if (map->size < (map->offset - byte_offset)) 121 1.5.4.2 tls return -1; 122 1.5.4.2 tls 123 1.5.4.2 tls return drm_mmap_map_paddr(dev, map, (byte_offset - map->offset), prot); 124 1.5.4.2 tls } 125 1.5.4.2 tls 126 1.5.4.2 tls static paddr_t 127 1.5.4.2 tls drm_mmap_dma_paddr(struct drm_device *dev, off_t byte_offset, int prot) 128 1.5.4.2 tls { 129 1.5.4.2 tls const off_t page_offset = (byte_offset >> PAGE_SHIFT); 130 1.5.4.2 tls 131 1.5.4.2 tls KASSERT(mutex_is_locked(&dev->struct_mutex)); 132 1.5.4.2 tls KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); 133 1.5.4.2 tls KASSERT(page_offset <= dev->dma->page_count); 134 1.5.4.2 tls 135 1.5.4.2 tls if (dev->dma->pagelist == NULL) 136 1.5.4.2 tls return (paddr_t)-1; 137 1.5.4.2 tls 138 1.5.4.2 tls return dev->dma->pagelist[page_offset]; 139 1.5.4.2 tls } 140 1.5.4.2 tls 141 1.5.4.2 tls static paddr_t 142 1.5.4.2 tls drm_mmap_map_paddr(struct drm_device *dev, struct drm_local_map *map, 143 1.5.4.2 tls off_t byte_offset, int prot) 144 1.5.4.2 tls { 145 1.5.4.2 tls int flags = 0; 146 1.5.4.2 tls 147 1.5.4.2 tls KASSERT(byte_offset <= map->size); 148 1.5.4.2 tls 149 1.5.4.2 tls switch (map->type) { 150 1.5.4.2 tls case _DRM_FRAME_BUFFER: 151 1.5.4.2 tls case _DRM_AGP: 152 1.5.4.2 tls flags |= BUS_SPACE_MAP_PREFETCHABLE; 153 1.5.4.2 tls /* Fall through. */ 154 1.5.4.2 tls 155 1.5.4.2 tls case _DRM_REGISTERS: 156 1.5.4.2 tls flags |= BUS_SPACE_MAP_LINEAR; /* XXX Why? */ 157 1.5.4.2 tls 158 1.5.4.2 tls return bus_space_mmap(map->lm_data.bus_space.bst, map->offset, 159 1.5.4.2 tls byte_offset, prot, flags); 160 1.5.4.2 tls 161 1.5.4.2 tls case _DRM_CONSISTENT: { 162 1.5.4.2 tls struct drm_dma_handle *const dmah = map->lm_data.dmah; 163 1.5.4.2 tls 164 1.5.4.2 tls return bus_dmamem_mmap(dev->dmat, &dmah->dmah_seg, 1, 165 1.5.4.2 tls byte_offset, prot, 166 1.5.4.2 tls /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ 167 1.5.4.2 tls /* XXX What else? BUS_DMA_COHERENT? */ 168 1.5.4.2 tls (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); 169 1.5.4.2 tls } 170 1.5.4.2 tls 171 1.5.4.2 tls case _DRM_SCATTER_GATHER: { 172 1.5.4.2 tls struct drm_sg_mem *const sg = dev->sg; 173 1.5.4.2 tls 174 1.5.4.2 tls #if 0 /* XXX */ 175 1.5.4.2 tls KASSERT(sg == map->lm_data.sg); 176 1.5.4.2 tls #endif 177 1.5.4.2 tls 178 1.5.4.2 tls return bus_dmamem_mmap(dev->dmat, sg->sg_segs, sg->sg_nsegs, 179 1.5.4.2 tls byte_offset, prot, 180 1.5.4.2 tls /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ 181 1.5.4.2 tls /* XXX What else? BUS_DMA_COHERENT? */ 182 1.5.4.2 tls (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); 183 1.5.4.2 tls } 184 1.5.4.2 tls 185 1.5.4.2 tls case _DRM_SHM: 186 1.5.4.2 tls default: 187 1.5.4.2 tls return (paddr_t)-1; 188 1.5.4.2 tls } 189 1.5.4.2 tls } 190
Indexes created Thu Oct 16 14:10:15 GMT 2025