1 | /* $NetBSD: drm_vm.c,v 1.7 2014/12/31 08:55:18 mrg 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 1.7 2014/12/31 08:55:18 mrg 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 | int |
49 | drm_mmap_object(struct drm_device *dev, off_t offset, size_t size, int prot, |
50 | struct uvm_object **uobjp, voff_t *uoffsetp, struct file *file __unused) |
51 | { |
52 | devmajor_t maj = cdevsw_lookup_major(&drm_cdevsw); |
53 | dev_t devno = makedev(maj, dev->primary->index); |
54 | struct uvm_object *uobj; |
55 | |
56 | KASSERT(offset == (offset & ~(PAGE_SIZE-1))); |
57 | |
58 | /* |
59 | * Attach the device. The size and offset are used only for |
60 | * access checks; offset does not become a base address for the |
61 | * subsequent uvm_map, hence we set *uoffsetp to offset, not 0. |
62 | */ |
63 | uobj = udv_attach(devno, prot, offset, size); |
64 | if (uobj == NULL) |
65 | return -EINVAL; |
66 | |
67 | *uobjp = uobj; |
68 | *uoffsetp = offset; |
69 | return 0; |
70 | } |
71 | |
72 | paddr_t |
73 | drm_mmap_paddr(struct drm_device *dev, off_t byte_offset, int prot) |
74 | { |
75 | paddr_t paddr; |
76 | |
77 | if (byte_offset != (byte_offset & ~(PAGE_SIZE-1))) |
78 | return -1; |
79 | |
80 | mutex_lock(&dev->struct_mutex); |
81 | paddr = drm_mmap_paddr_locked(dev, byte_offset, prot); |
82 | mutex_unlock(&dev->struct_mutex); |
83 | |
84 | return paddr; |
85 | } |
86 | |
87 | static paddr_t |
88 | drm_mmap_paddr_locked(struct drm_device *dev, off_t byte_offset, int prot) |
89 | { |
90 | const off_t page_offset = (byte_offset >> PAGE_SHIFT); |
91 | struct drm_hash_item *hash; |
92 | |
93 | KASSERT(mutex_is_locked(&dev->struct_mutex)); |
94 | KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); |
95 | |
96 | if ((dev->dma != NULL) && |
97 | (0 <= byte_offset) && |
98 | (page_offset <= dev->dma->page_count)) |
99 | return drm_mmap_dma_paddr(dev, byte_offset, prot); |
100 | |
101 | if (drm_ht_find_item(&dev->map_hash, page_offset, &hash)) |
102 | return -1; |
103 | |
104 | struct drm_local_map *const map = drm_hash_entry(hash, |
105 | struct drm_map_list, hash)->map; |
106 | if (map == NULL) |
107 | return -1; |
108 | |
109 | /* |
110 | * XXX FreeBSD drops the mutex at this point, which would be |
111 | * nice, to allow sleeping in bus_dma cruft, but I don't know |
112 | * what guarantees the map will continue to exist. |
113 | */ |
114 | |
115 | if (ISSET(map->flags, _DRM_RESTRICTED) && !DRM_SUSER()) |
116 | return -1; |
117 | |
118 | if (!(map->offset <= byte_offset)) |
119 | return -1; |
120 | if (map->size < (map->offset - byte_offset)) |
121 | return -1; |
122 | |
123 | return drm_mmap_map_paddr(dev, map, (byte_offset - map->offset), prot); |
124 | } |
125 | |
126 | static paddr_t |
127 | drm_mmap_dma_paddr(struct drm_device *dev, off_t byte_offset, int prot) |
128 | { |
129 | const off_t page_offset = (byte_offset >> PAGE_SHIFT); |
130 | |
131 | KASSERT(mutex_is_locked(&dev->struct_mutex)); |
132 | KASSERT(byte_offset == (byte_offset & ~(PAGE_SIZE-1))); |
133 | KASSERT(page_offset <= dev->dma->page_count); |
134 | |
135 | if (dev->dma->pagelist == NULL) |
136 | return (paddr_t)-1; |
137 | |
138 | return dev->dma->pagelist[page_offset]; |
139 | } |
140 | |
141 | static paddr_t |
142 | drm_mmap_map_paddr(struct drm_device *dev, struct drm_local_map *map, |
143 | off_t byte_offset, int prot) |
144 | { |
145 | int flags = 0; |
146 | |
147 | KASSERT(byte_offset <= map->size); |
148 | |
149 | switch (map->type) { |
150 | case _DRM_FRAME_BUFFER: |
151 | case _DRM_AGP: |
152 | flags |= BUS_SPACE_MAP_PREFETCHABLE; |
153 | /* Fall through. */ |
154 | |
155 | case _DRM_REGISTERS: |
156 | flags |= BUS_SPACE_MAP_LINEAR; /* XXX Why? */ |
157 | |
158 | return bus_space_mmap(map->lm_data.bus_space.bst, map->offset, |
159 | byte_offset, prot, flags); |
160 | |
161 | case _DRM_CONSISTENT: { |
162 | struct drm_dma_handle *const dmah = map->lm_data.dmah; |
163 | |
164 | return bus_dmamem_mmap(dev->dmat, &dmah->dmah_seg, 1, |
165 | byte_offset, prot, |
166 | /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ |
167 | /* XXX What else? BUS_DMA_COHERENT? */ |
168 | (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); |
169 | } |
170 | |
171 | case _DRM_SCATTER_GATHER: { |
172 | struct drm_sg_mem *const sg = dev->sg; |
173 | |
174 | #if 0 /* XXX */ |
175 | KASSERT(sg == map->lm_data.sg); |
176 | #endif |
177 | |
178 | return bus_dmamem_mmap(dev->dmat, sg->sg_segs, sg->sg_nsegs, |
179 | byte_offset, prot, |
180 | /* XXX BUS_DMA_WAITOK? We're holding a mutex... */ |
181 | /* XXX What else? BUS_DMA_COHERENT? */ |
182 | (BUS_DMA_WAITOK | BUS_DMA_NOCACHE)); |
183 | } |
184 | |
185 | case _DRM_SHM: |
186 | default: |
187 | return (paddr_t)-1; |
188 | } |
189 | } |
190 | |