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
25 #include <sys/cdefs.h>
26 /** @file drm_scatter.c
27 * Allocation of memory for scatter-gather mappings by the graphics chip.
28 * The memory allocated here is then made into an aperture in the card
29 * by mapping the pages into the GART.
30 */
31
32 #include <dev/drm2/drmP.h>
33
34 #define DEBUG_SCATTER 0
35
drm_vmalloc_dma(vm_size_t size)36 static inline void *drm_vmalloc_dma(vm_size_t size)
37 {
38 return kmem_alloc_attr(size, M_NOWAIT | M_ZERO, 0,
39 BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
40 }
41
drm_sg_cleanup(struct drm_sg_mem * entry)42 void drm_sg_cleanup(struct drm_sg_mem * entry)
43 {
44 if (entry == NULL)
45 return;
46
47 if (entry->vaddr != NULL)
48 kmem_free(entry->vaddr, IDX_TO_OFF(entry->pages));
49
50 free(entry->busaddr, DRM_MEM_SGLISTS);
51 free(entry, DRM_MEM_DRIVER);
52 }
53
drm_sg_alloc(struct drm_device * dev,struct drm_scatter_gather * request)54 int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
55 {
56 struct drm_sg_mem *entry;
57 vm_size_t size;
58 vm_pindex_t pindex;
59
60 DRM_DEBUG("\n");
61
62 if (!drm_core_check_feature(dev, DRIVER_SG))
63 return -EINVAL;
64
65 if (dev->sg)
66 return -EINVAL;
67
68 entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
69 if (!entry)
70 return -ENOMEM;
71
72 DRM_DEBUG("request size=%ld\n", request->size);
73
74 size = round_page(request->size);
75 entry->pages = atop(size);
76 entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
77 DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO);
78 if (!entry->busaddr) {
79 free(entry, DRM_MEM_DRIVER);
80 return -ENOMEM;
81 }
82
83 entry->vaddr = drm_vmalloc_dma(size);
84 if (entry->vaddr == NULL) {
85 free(entry->busaddr, DRM_MEM_DRIVER);
86 free(entry, DRM_MEM_DRIVER);
87 return -ENOMEM;
88 }
89
90 for (pindex = 0; pindex < entry->pages; pindex++) {
91 entry->busaddr[pindex] =
92 vtophys((uintptr_t)entry->vaddr + IDX_TO_OFF(pindex));
93 }
94
95 request->handle = (uintptr_t)entry->vaddr;
96
97 dev->sg = entry;
98
99 DRM_DEBUG("allocated %ju pages @ %p, contents=%08lx\n",
100 entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
101
102 return 0;
103 }
104
drm_sg_alloc_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)105 int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
106 struct drm_file *file_priv)
107 {
108 struct drm_scatter_gather *request = data;
109
110 return drm_sg_alloc(dev, request);
111
112 }
113
drm_sg_free(struct drm_device * dev,void * data,struct drm_file * file_priv)114 int drm_sg_free(struct drm_device *dev, void *data,
115 struct drm_file *file_priv)
116 {
117 struct drm_scatter_gather *request = data;
118 struct drm_sg_mem *entry;
119
120 if (!drm_core_check_feature(dev, DRIVER_SG))
121 return -EINVAL;
122
123 entry = dev->sg;
124 dev->sg = NULL;
125
126 if (!entry || (uintptr_t)entry->vaddr != request->handle)
127 return -EINVAL;
128
129 DRM_DEBUG("free %p\n", entry->vaddr);
130
131 drm_sg_cleanup(entry);
132
133 return 0;
134 }
135