1 | /* |
2 | * \file drm_dma.c |
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 | |
36 | #include <linux/export.h> |
37 | #include <linux/pci.h> |
38 | |
39 | #include <drm/drm_drv.h> |
40 | #include <drm/drm_print.h> |
41 | |
42 | #include "drm_legacy.h" |
43 | |
44 | /** |
45 | * drm_legacy_dma_setup() - Initialize the DMA data. |
46 | * |
47 | * @dev: DRM device. |
48 | * Return: zero on success or a negative value on failure. |
49 | * |
50 | * Allocate and initialize a drm_device_dma structure. |
51 | */ |
52 | int drm_legacy_dma_setup(struct drm_device *dev) |
53 | { |
54 | int i; |
55 | |
56 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA) || |
57 | !drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
58 | return 0; |
59 | |
60 | dev->buf_use = 0; |
61 | atomic_set(v: &dev->buf_alloc, i: 0); |
62 | |
63 | dev->dma = kzalloc(size: sizeof(*dev->dma), GFP_KERNEL); |
64 | if (!dev->dma) |
65 | return -ENOMEM; |
66 | |
67 | for (i = 0; i <= DRM_MAX_ORDER; i++) |
68 | memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); |
69 | |
70 | return 0; |
71 | } |
72 | |
73 | /** |
74 | * drm_legacy_dma_takedown() - Cleanup the DMA resources. |
75 | * |
76 | * @dev: DRM device. |
77 | * |
78 | * Free all pages associated with DMA buffers, the buffers and pages lists, and |
79 | * finally the drm_device::dma structure itself. |
80 | */ |
81 | void drm_legacy_dma_takedown(struct drm_device *dev) |
82 | { |
83 | struct drm_device_dma *dma = dev->dma; |
84 | drm_dma_handle_t *dmah; |
85 | int i, j; |
86 | |
87 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA) || |
88 | !drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
89 | return; |
90 | |
91 | if (!dma) |
92 | return; |
93 | |
94 | /* Clear dma buffers */ |
95 | for (i = 0; i <= DRM_MAX_ORDER; i++) { |
96 | if (dma->bufs[i].seg_count) { |
97 | DRM_DEBUG("order %d: buf_count = %d," |
98 | " seg_count = %d\n" , |
99 | i, |
100 | dma->bufs[i].buf_count, |
101 | dma->bufs[i].seg_count); |
102 | for (j = 0; j < dma->bufs[i].seg_count; j++) { |
103 | if (dma->bufs[i].seglist[j]) { |
104 | dmah = dma->bufs[i].seglist[j]; |
105 | dma_free_coherent(dev: dev->dev, |
106 | size: dmah->size, |
107 | cpu_addr: dmah->vaddr, |
108 | dma_handle: dmah->busaddr); |
109 | kfree(objp: dmah); |
110 | } |
111 | } |
112 | kfree(objp: dma->bufs[i].seglist); |
113 | } |
114 | if (dma->bufs[i].buf_count) { |
115 | for (j = 0; j < dma->bufs[i].buf_count; j++) { |
116 | kfree(objp: dma->bufs[i].buflist[j].dev_private); |
117 | } |
118 | kfree(objp: dma->bufs[i].buflist); |
119 | } |
120 | } |
121 | |
122 | kfree(objp: dma->buflist); |
123 | kfree(objp: dma->pagelist); |
124 | kfree(objp: dev->dma); |
125 | dev->dma = NULL; |
126 | } |
127 | |
128 | /** |
129 | * drm_legacy_free_buffer() - Free a buffer. |
130 | * |
131 | * @dev: DRM device. |
132 | * @buf: buffer to free. |
133 | * |
134 | * Resets the fields of \p buf. |
135 | */ |
136 | void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) |
137 | { |
138 | if (!buf) |
139 | return; |
140 | |
141 | buf->waiting = 0; |
142 | buf->pending = 0; |
143 | buf->file_priv = NULL; |
144 | buf->used = 0; |
145 | } |
146 | |
147 | /** |
148 | * drm_legacy_reclaim_buffers() - Reclaim the buffers. |
149 | * |
150 | * @dev: DRM device. |
151 | * @file_priv: DRM file private. |
152 | * |
153 | * Frees each buffer associated with \p file_priv not already on the hardware. |
154 | */ |
155 | void drm_legacy_reclaim_buffers(struct drm_device *dev, |
156 | struct drm_file *file_priv) |
157 | { |
158 | struct drm_device_dma *dma = dev->dma; |
159 | int i; |
160 | |
161 | if (!dma) |
162 | return; |
163 | for (i = 0; i < dma->buf_count; i++) { |
164 | if (dma->buflist[i]->file_priv == file_priv) { |
165 | switch (dma->buflist[i]->list) { |
166 | case DRM_LIST_NONE: |
167 | drm_legacy_free_buffer(dev, buf: dma->buflist[i]); |
168 | break; |
169 | case DRM_LIST_WAIT: |
170 | dma->buflist[i]->list = DRM_LIST_RECLAIM; |
171 | break; |
172 | default: |
173 | /* Buffer already on hardware. */ |
174 | break; |
175 | } |
176 | } |
177 | } |
178 | } |
179 | |