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: head/sys/dev/drm2/drm_vm.c 235783 2012-05-22 11:07:44Z kib $"
27 * Support code for mmaping of DRM maps.
31 #include <sys/devfs.h>
32 #include <sys/mutex2.h>
33 #include <vm/vm_page.h>
34 #include <vm/vm_pager.h>
37 #include <asm/pgtable.h>
38 #include "drm_legacy.h"
40 int drm_mmap(struct dev_mmap_args *ap)
42 struct cdev *kdev = ap->a_head.a_dev;
43 vm_offset_t offset = ap->a_offset;
44 struct drm_device *dev = drm_get_device_from_kdev(kdev);
45 struct drm_file *file_priv = NULL;
46 struct drm_local_map *map = NULL;
48 struct drm_hash_item *hash;
50 enum drm_map_type type;
53 /* d_mmap gets called twice, we can only reference file_priv during
54 * the first call. We need to assume that if error is EBADF the
55 * call was succesful and the client is authenticated.
57 error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
58 if (error == ENOENT) {
59 DRM_ERROR("Could not find authenticator!\n");
63 if (file_priv && !file_priv->authenticated)
66 DRM_DEBUG("called with offset %016jx\n", (uintmax_t)offset);
67 if (dev->dma && offset < ptoa(dev->dma->page_count)) {
68 drm_device_dma_t *dma = dev->dma;
70 spin_lock(&dev->dma_lock);
72 if (dma->pagelist != NULL) {
73 unsigned long page = offset >> PAGE_SHIFT;
74 unsigned long phys = dma->pagelist[page];
76 spin_unlock(&dev->dma_lock);
81 spin_unlock(&dev->dma_lock);
86 /* A sequential search of a linked list is
87 fine here because: 1) there will only be
88 about 5-10 entries in the list and, 2) a
89 DRI client only has to do this mapping
90 once, so it doesn't have to be optimized
91 for performance, even if the list was a
96 if (drm_ht_find_item(&dev->map_hash, offset, &hash)) {
97 DRM_ERROR("Could not find map\n");
101 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
103 DRM_DEBUG("Can't find map, request offset = %016jx\n",
108 if (((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) {
110 DRM_DEBUG("restricted map\n");
118 case _DRM_FRAME_BUFFER:
121 *memattr = VM_MEMATTR_WRITE_COMBINING;
125 phys = map->offset + offset;
127 case _DRM_SCATTER_GATHER:
129 *memattr = VM_MEMATTR_WRITE_COMBINING;
132 case _DRM_CONSISTENT:
134 phys = vtophys((char *)map->handle + offset);
137 DRM_ERROR("bad map type %d\n", type);
138 return -1; /* This should never happen. */
141 ap->a_result = atop(phys);
145 /* XXX The following is just temporary hack to replace the
146 * vm_phys_fictitious functions available on FreeBSD
148 #define VM_PHYS_FICTITIOUS_NSEGS 8
149 static struct vm_phys_fictitious_seg {
152 vm_page_t first_page;
153 } vm_phys_fictitious_segs[VM_PHYS_FICTITIOUS_NSEGS];
154 static struct mtx vm_phys_fictitious_reg_mtx = MTX_INITIALIZER("vmphy");
157 vm_phys_fictitious_to_vm_page(vm_paddr_t pa)
159 struct vm_phys_fictitious_seg *seg;
164 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
165 seg = &vm_phys_fictitious_segs[segind];
166 if (pa >= seg->start && pa < seg->end) {
167 m = &seg->first_page[atop(pa - seg->start)];
168 KASSERT((m->flags & PG_FICTITIOUS) != 0,
169 ("%p not fictitious", m));
177 vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
178 vm_memattr_t memattr)
180 struct vm_phys_fictitious_seg *seg;
185 page_count = (end - start) / PAGE_SIZE;
187 fp = kmalloc(page_count * sizeof(struct vm_page), M_DRM,
190 for (i = 0; i < page_count; i++) {
191 vm_page_initfake(&fp[i], start + PAGE_SIZE * i, memattr);
192 fp[i].flags &= ~(PG_BUSY | PG_UNMANAGED);
194 mtx_lock(&vm_phys_fictitious_reg_mtx);
195 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
196 seg = &vm_phys_fictitious_segs[segind];
197 if (seg->start == 0 && seg->end == 0) {
200 seg->first_page = fp;
201 mtx_unlock(&vm_phys_fictitious_reg_mtx);
205 mtx_unlock(&vm_phys_fictitious_reg_mtx);
211 vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
213 struct vm_phys_fictitious_seg *seg;
217 mtx_lock(&vm_phys_fictitious_reg_mtx);
218 for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
219 seg = &vm_phys_fictitious_segs[segind];
220 if (seg->start == start && seg->end == end) {
221 seg->start = seg->end = 0;
222 fp = seg->first_page;
223 seg->first_page = NULL;
224 mtx_unlock(&vm_phys_fictitious_reg_mtx);
229 mtx_unlock(&vm_phys_fictitious_reg_mtx);
230 KASSERT(0, ("Unregistering not registered fictitious range"));