2 * Copyright 2003 Eric Anholt
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 * $FreeBSD: src/sys/dev/drm2/drm_vm.c,v 1.1 2012/05/22 11:07:44 kib Exp $
27 * Support code for mmaping of DRM maps.
31 #include <dev/drm2/drmP.h>
32 #include <dev/drm2/drm.h>
35 drm_mmap(struct dev_mmap_args *ap)
37 struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
38 int prot, vm_memattr_t *memattr)*/
40 struct cdev *kdev = ap->a_head.a_dev;
41 vm_offset_t offset = ap->a_offset;
42 struct drm_device *dev = drm_get_device_from_kdev(kdev);
43 struct drm_file *file_priv = NULL;
45 enum drm_map_type type;
49 /* d_mmap gets called twice, we can only reference file_priv during
50 * the first call. We need to assume that if error is EBADF the
51 * call was succesful and the client is authenticated.
53 error = devfs_get_cdevpriv((void **)&file_priv);
54 if (error == ENOENT) {
55 DRM_ERROR("Could not find authenticator!\n");
59 if (file_priv && !file_priv->authenticated)
62 DRM_DEBUG("called with offset %016jx\n", offset);
63 if (dev->dma && offset < ptoa(dev->dma->page_count)) {
64 drm_device_dma_t *dma = dev->dma;
66 DRM_SPINLOCK(&dev->dma_lock);
68 if (dma->pagelist != NULL) {
69 unsigned long page = offset >> PAGE_SHIFT;
70 phys = dma->pagelist[page];
72 DRM_SPINUNLOCK(&dev->dma_lock);
75 DRM_SPINUNLOCK(&dev->dma_lock);
80 /* A sequential search of a linked list is
81 fine here because: 1) there will only be
82 about 5-10 entries in the list and, 2) a
83 DRI client only has to do this mapping
84 once, so it doesn't have to be optimized
85 for performance, even if the list was a
89 TAILQ_FOREACH(map, &dev->maplist, link) {
90 if (offset >> DRM_MAP_HANDLE_SHIFT ==
91 (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
96 DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
97 TAILQ_FOREACH(map, &dev->maplist, link) {
98 DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
99 map->offset, (unsigned long)map->handle);
104 if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
106 DRM_DEBUG("restricted map\n");
112 offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
115 case _DRM_FRAME_BUFFER:
119 *memattr = VM_MEMATTR_WRITE_COMBINING;
123 phys = map->offset + offset;
125 case _DRM_SCATTER_GATHER:
128 *memattr = VM_MEMATTR_WRITE_COMBINING;
131 case _DRM_CONSISTENT:
133 phys = vtophys((char *)map->virtual + offset);
136 DRM_ERROR("bad map type %d\n", type);
137 return -1; /* This should never happen. */
140 ap->a_result = atop(phys);