Commit | Line | Data |
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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_dma.c |
1da177e4 LT |
3 | * DMA IOCTL and function support |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
2d1a8a48 | 36 | #include <linux/export.h> |
760285e7 | 37 | #include <drm/drmP.h> |
ba8286fa | 38 | #include "drm_legacy.h" |
1da177e4 LT |
39 | |
40 | /** | |
41 | * Initialize the DMA data. | |
b5e89ed5 | 42 | * |
1da177e4 LT |
43 | * \param dev DRM device. |
44 | * \return zero on success or a negative value on failure. | |
45 | * | |
46 | * Allocate and initialize a drm_device_dma structure. | |
47 | */ | |
e2e99a82 | 48 | int drm_legacy_dma_setup(struct drm_device *dev) |
1da177e4 LT |
49 | { |
50 | int i; | |
51 | ||
e2e99a82 | 52 | if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || |
fa538645 | 53 | !drm_core_check_feature(dev, DRIVER_LEGACY)) |
e2e99a82 | 54 | return 0; |
e2e99a82 DV |
55 | |
56 | dev->buf_use = 0; | |
57 | atomic_set(&dev->buf_alloc, 0); | |
58 | ||
6ebc22e6 | 59 | dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL); |
b5e89ed5 | 60 | if (!dev->dma) |
1da177e4 LT |
61 | return -ENOMEM; |
62 | ||
b5e89ed5 | 63 | for (i = 0; i <= DRM_MAX_ORDER; i++) |
1da177e4 LT |
64 | memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | /** | |
70 | * Cleanup the DMA resources. | |
71 | * | |
72 | * \param dev DRM device. | |
73 | * | |
74 | * Free all pages associated with DMA buffers, the buffers and pages lists, and | |
59c51591 | 75 | * finally the drm_device::dma structure itself. |
1da177e4 | 76 | */ |
e2e99a82 | 77 | void drm_legacy_dma_takedown(struct drm_device *dev) |
1da177e4 | 78 | { |
cdd55a29 | 79 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 | 80 | int i, j; |
1da177e4 | 81 | |
e2e99a82 | 82 | if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || |
fa538645 | 83 | !drm_core_check_feature(dev, DRIVER_LEGACY)) |
e2e99a82 | 84 | return; |
e2e99a82 | 85 | |
b5e89ed5 DA |
86 | if (!dma) |
87 | return; | |
1da177e4 | 88 | |
b5e89ed5 | 89 | /* Clear dma buffers */ |
1da177e4 LT |
90 | for (i = 0; i <= DRM_MAX_ORDER; i++) { |
91 | if (dma->bufs[i].seg_count) { | |
92 | DRM_DEBUG("order %d: buf_count = %d," | |
93 | " seg_count = %d\n", | |
94 | i, | |
95 | dma->bufs[i].buf_count, | |
96 | dma->bufs[i].seg_count); | |
97 | for (j = 0; j < dma->bufs[i].seg_count; j++) { | |
98 | if (dma->bufs[i].seglist[j]) { | |
ddf19b97 | 99 | drm_pci_free(dev, dma->bufs[i].seglist[j]); |
1da177e4 LT |
100 | } |
101 | } | |
9a298b2a | 102 | kfree(dma->bufs[i].seglist); |
1da177e4 | 103 | } |
b5e89ed5 DA |
104 | if (dma->bufs[i].buf_count) { |
105 | for (j = 0; j < dma->bufs[i].buf_count; j++) { | |
9a298b2a | 106 | kfree(dma->bufs[i].buflist[j].dev_private); |
1da177e4 | 107 | } |
9a298b2a | 108 | kfree(dma->bufs[i].buflist); |
1da177e4 LT |
109 | } |
110 | } | |
111 | ||
9a298b2a EA |
112 | kfree(dma->buflist); |
113 | kfree(dma->pagelist); | |
114 | kfree(dev->dma); | |
1da177e4 LT |
115 | dev->dma = NULL; |
116 | } | |
117 | ||
1da177e4 LT |
118 | /** |
119 | * Free a buffer. | |
120 | * | |
121 | * \param dev DRM device. | |
122 | * \param buf buffer to free. | |
b5e89ed5 | 123 | * |
1da177e4 LT |
124 | * Resets the fields of \p buf. |
125 | */ | |
a266162a | 126 | void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) |
1da177e4 | 127 | { |
b5e89ed5 DA |
128 | if (!buf) |
129 | return; | |
1da177e4 | 130 | |
b5e89ed5 DA |
131 | buf->waiting = 0; |
132 | buf->pending = 0; | |
6c340eac | 133 | buf->file_priv = NULL; |
b5e89ed5 | 134 | buf->used = 0; |
1da177e4 LT |
135 | } |
136 | ||
137 | /** | |
138 | * Reclaim the buffers. | |
139 | * | |
6c340eac | 140 | * \param file_priv DRM file private. |
1da177e4 | 141 | * |
6c340eac | 142 | * Frees each buffer associated with \p file_priv not already on the hardware. |
1da177e4 | 143 | */ |
a266162a DV |
144 | void drm_legacy_reclaim_buffers(struct drm_device *dev, |
145 | struct drm_file *file_priv) | |
1da177e4 | 146 | { |
cdd55a29 | 147 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 | 148 | int i; |
1da177e4 | 149 | |
b5e89ed5 DA |
150 | if (!dma) |
151 | return; | |
1da177e4 | 152 | for (i = 0; i < dma->buf_count; i++) { |
6c340eac | 153 | if (dma->buflist[i]->file_priv == file_priv) { |
1da177e4 LT |
154 | switch (dma->buflist[i]->list) { |
155 | case DRM_LIST_NONE: | |
a266162a | 156 | drm_legacy_free_buffer(dev, dma->buflist[i]); |
1da177e4 LT |
157 | break; |
158 | case DRM_LIST_WAIT: | |
159 | dma->buflist[i]->list = DRM_LIST_RECLAIM; | |
160 | break; | |
161 | default: | |
162 | /* Buffer already on hardware. */ | |
163 | break; | |
164 | } | |
165 | } | |
166 | } | |
167 | } |