1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /* BEGIN CSTYLED */
7
8 /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com */
10 /*-
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 *
33 * Authors:
34 * Gareth Hughes <gareth@valinux.com>
35 * Eric Anholt <anholt@FreeBSD.org>
36 *
37 */
38 /* END CSTYLED */
39
40 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 #include "drmP.h"
43 #include <gfx_private.h>
44 #include "drm_io32.h"
45
46 #define DEBUG_SCATTER 0
47
48 #ifdef _LP64
49 #define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
50 #else
51 #define ScatterHandle(x) (unsigned int)(x)
52 #endif
53
54 void
drm_sg_cleanup(drm_device_t * dev,drm_sg_mem_t * entry)55 drm_sg_cleanup(drm_device_t *dev, drm_sg_mem_t *entry)
56 {
57 int pages = entry->pages;
58
59 if (entry->busaddr) {
60 kmem_free(entry->busaddr, sizeof (*entry->busaddr) * pages);
61 entry->busaddr = NULL;
62 }
63
64 ASSERT(entry->umem_cookie == NULL);
65
66 if (entry->dmah_sg) {
67 drm_pci_free(dev, entry->dmah_sg);
68 entry->dmah_sg = NULL;
69 }
70
71 if (entry->dmah_gart) {
72 drm_pci_free(dev, entry->dmah_gart);
73 entry->dmah_gart = NULL;
74 }
75
76 if (entry) {
77 drm_free(entry, sizeof (drm_sg_mem_t), DRM_MEM_SGLISTS);
78 entry = NULL;
79 }
80 }
81
82 /*ARGSUSED*/
83 int
drm_sg_alloc(DRM_IOCTL_ARGS)84 drm_sg_alloc(DRM_IOCTL_ARGS)
85 {
86 DRM_DEVICE;
87 unsigned long pages;
88 drm_sg_mem_t *entry;
89 drm_dma_handle_t *dmah;
90 drm_scatter_gather_t request;
91
92 DRM_DEBUG("%s\n", "drm_sg_alloc");
93
94 if (dev->sg)
95 return (EINVAL);
96
97 #ifdef _MULTI_DATAMODEL
98 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
99 drm_scatter_gather_32_t request32;
100
101 DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
102 sizeof (request32));
103 request.size = request32.size;
104 request.handle = request32.handle;
105 } else
106 #endif
107 DRM_COPYFROM_WITH_RETURN(&request, (void *)data,
108 sizeof (request));
109
110 pages = btopr(request.size);
111 DRM_DEBUG("sg size=%ld pages=%ld\n", request.size, pages);
112 entry = kmem_zalloc(sizeof (*entry), KM_SLEEP);
113 entry->pages = (int)pages;
114 dmah = drm_pci_alloc(dev, ptob(pages), 4096, 0xfffffffful, pages);
115 if (dmah == NULL)
116 goto err_exit;
117 entry->busaddr = (void *)kmem_zalloc(sizeof (*entry->busaddr) *
118 pages, KM_SLEEP);
119
120 entry->handle = ScatterHandle((unsigned long)dmah->vaddr);
121 entry->virtual = (void *)dmah->vaddr;
122 request.handle = entry->handle;
123 entry->dmah_sg = dmah;
124 #ifdef _MULTI_DATAMODEL
125 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
126 drm_scatter_gather_32_t data32;
127
128 data32.size = (uint32_t)request.size;
129 data32.handle = (uint32_t)request.handle;
130
131 DRM_COPYTO_WITH_RETURN((void *)data, &data32,
132 sizeof (data32));
133 } else
134 #endif
135 DRM_COPYTO_WITH_RETURN((void *)data, &request,
136 sizeof (request));
137
138 DRM_LOCK();
139 if (dev->sg) {
140 DRM_UNLOCK();
141 drm_sg_cleanup(dev, entry);
142 return (EINVAL);
143 }
144 dev->sg = entry;
145 DRM_UNLOCK();
146
147 return (0);
148
149 err_exit:
150 drm_sg_cleanup(dev, entry);
151 return (ENOMEM);
152 }
153
154 /*ARGSUSED*/
155 int
drm_sg_free(DRM_IOCTL_ARGS)156 drm_sg_free(DRM_IOCTL_ARGS)
157 {
158 DRM_DEVICE;
159 drm_scatter_gather_t request;
160 drm_sg_mem_t *entry;
161
162 #ifdef _MULTI_DATAMODEL
163 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
164 drm_scatter_gather_32_t request32;
165
166 DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
167 sizeof (request32));
168 request.size = request32.size;
169 request.handle = request32.handle;
170 } else
171 #endif
172 DRM_COPYFROM_WITH_RETURN(&request, (void *)data,
173 sizeof (request));
174
175 DRM_LOCK();
176 entry = dev->sg;
177 dev->sg = NULL;
178 DRM_UNLOCK();
179
180 if (!entry || entry->handle != request.handle)
181 return (EINVAL);
182
183 drm_sg_cleanup(dev, entry);
184
185 return (0);
186 }
187