1 /*-
2 * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
3 * All Rights Reserved.
4 *
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:
11 *
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
14 * Software.
15 *
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 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * $FreeBSD: src/sys/dev/drm2/drm_scatter.c,v 1.1 2012/05/22 11:07:44 kib Exp $
25 */
26
27 /** @file drm_scatter.c
28 * Allocation of memory for scatter-gather mappings by the graphics chip.
29 * The memory allocated here is then made into an aperture in the card
30 * by mapping the pages into the GART.
31 */
32
33 #include <drm/drmP.h>
34 #include "drm_legacy.h"
35
36 #include <vm/vm_kern.h>
37
drm_sg_cleanup(struct drm_sg_mem * entry)38 static void drm_sg_cleanup(struct drm_sg_mem * entry)
39 {
40 if (entry == NULL)
41 return;
42
43 if (entry->vaddr != 0)
44 kmem_free(kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages));
45
46 kfree(entry->busaddr);
47 kfree(entry);
48 }
49
drm_legacy_sg_cleanup(struct drm_device * dev)50 void drm_legacy_sg_cleanup(struct drm_device *dev)
51 {
52 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
53 drm_core_check_feature(dev, DRIVER_LEGACY)) {
54 drm_sg_cleanup(dev->sg);
55 dev->sg = NULL;
56 }
57 }
58
drm_legacy_sg_alloc(struct drm_device * dev,void * data,struct drm_file * file_priv)59 int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
60 struct drm_file *file_priv)
61 {
62 struct drm_scatter_gather *request = data;
63 struct drm_sg_mem *entry;
64 vm_size_t size;
65 vm_pindex_t pindex;
66
67 DRM_DEBUG("\n");
68
69 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
70 return -EINVAL;
71
72 if (dev->sg)
73 return -EINVAL;
74
75 DRM_DEBUG("request size=%ld\n", request->size);
76
77 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
78
79 size = round_page(request->size);
80 entry->pages = OFF_TO_IDX(size);
81 entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr),
82 M_DRM, M_WAITOK | M_ZERO);
83
84 entry->vaddr = kmem_alloc_attr(kernel_map, size,
85 VM_SUBSYS_DRM_SCAT, M_WAITOK | M_ZERO,
86 0, BUS_SPACE_MAXADDR_32BIT,
87 VM_MEMATTR_WRITE_COMBINING);
88 if (entry->vaddr == 0) {
89 drm_sg_cleanup(entry);
90 return (-ENOMEM);
91 }
92
93 for(pindex = 0; pindex < entry->pages; pindex++) {
94 entry->busaddr[pindex] =
95 vtophys(entry->vaddr + IDX_TO_OFF(pindex));
96 }
97
98 DRM_LOCK(dev);
99 if (dev->sg) {
100 DRM_UNLOCK(dev);
101 drm_sg_cleanup(entry);
102 return (-EINVAL);
103 }
104 dev->sg = entry;
105 DRM_UNLOCK(dev);
106
107 request->handle = entry->vaddr;
108
109 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n",
110 entry->pages, (uintmax_t)entry->vaddr,
111 *(unsigned long *)entry->vaddr);
112
113 return (0);
114 }
115
drm_legacy_sg_free(struct drm_device * dev,void * data,struct drm_file * file_priv)116 int drm_legacy_sg_free(struct drm_device *dev, void *data,
117 struct drm_file *file_priv)
118 {
119 struct drm_scatter_gather *request = data;
120 struct drm_sg_mem *entry;
121
122 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
123 return -EINVAL;
124
125 if (!drm_core_check_feature(dev, DRIVER_SG))
126 return -EINVAL;
127
128 entry = dev->sg;
129 dev->sg = NULL;
130
131 if (!entry || entry->vaddr != request->handle)
132 return -EINVAL;
133
134 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr);
135
136 drm_sg_cleanup(entry);
137
138 return 0;
139 }
140