Remove obsolete #include <linux/config.h>
[linux-3.10.git] / drivers / char / drm / drm_dma.c
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 "drmP.h"
37
38 /**
39  * Initialize the DMA data.
40  *
41  * \param dev DRM device.
42  * \return zero on success or a negative value on failure.
43  *
44  * Allocate and initialize a drm_device_dma structure.
45  */
46 int drm_dma_setup(drm_device_t * dev)
47 {
48         int i;
49
50         dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
51         if (!dev->dma)
52                 return -ENOMEM;
53
54         memset(dev->dma, 0, sizeof(*dev->dma));
55
56         for (i = 0; i <= DRM_MAX_ORDER; i++)
57                 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
58
59         return 0;
60 }
61
62 /**
63  * Cleanup the DMA resources.
64  *
65  * \param dev DRM device.
66  *
67  * Free all pages associated with DMA buffers, the buffers and pages lists, and
68  * finally the the drm_device::dma structure itself.
69  */
70 void drm_dma_takedown(drm_device_t * dev)
71 {
72         drm_device_dma_t *dma = dev->dma;
73         int i, j;
74
75         if (!dma)
76                 return;
77
78         /* Clear dma buffers */
79         for (i = 0; i <= DRM_MAX_ORDER; i++) {
80                 if (dma->bufs[i].seg_count) {
81                         DRM_DEBUG("order %d: buf_count = %d,"
82                                   " seg_count = %d\n",
83                                   i,
84                                   dma->bufs[i].buf_count,
85                                   dma->bufs[i].seg_count);
86                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
87                                 if (dma->bufs[i].seglist[j]) {
88                                         drm_pci_free(dev, dma->bufs[i].seglist[j]);
89                                 }
90                         }
91                         drm_free(dma->bufs[i].seglist,
92                                  dma->bufs[i].seg_count
93                                  * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
94                 }
95                 if (dma->bufs[i].buf_count) {
96                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
97                                 if (dma->bufs[i].buflist[j].dev_private) {
98                                         drm_free(dma->bufs[i].buflist[j].
99                                                  dev_private,
100                                                  dma->bufs[i].buflist[j].
101                                                  dev_priv_size, DRM_MEM_BUFS);
102                                 }
103                         }
104                         drm_free(dma->bufs[i].buflist,
105                                  dma->bufs[i].buf_count *
106                                  sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
107                 }
108         }
109
110         if (dma->buflist) {
111                 drm_free(dma->buflist,
112                          dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
113         }
114
115         if (dma->pagelist) {
116                 drm_free(dma->pagelist,
117                          dma->page_count * sizeof(*dma->pagelist),
118                          DRM_MEM_PAGES);
119         }
120         drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
121         dev->dma = NULL;
122 }
123
124 /**
125  * Free a buffer.
126  *
127  * \param dev DRM device.
128  * \param buf buffer to free.
129  *
130  * Resets the fields of \p buf.
131  */
132 void drm_free_buffer(drm_device_t * dev, drm_buf_t * buf)
133 {
134         if (!buf)
135                 return;
136
137         buf->waiting = 0;
138         buf->pending = 0;
139         buf->filp = NULL;
140         buf->used = 0;
141
142         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
143             && waitqueue_active(&buf->dma_wait)) {
144                 wake_up_interruptible(&buf->dma_wait);
145         }
146 }
147
148 /**
149  * Reclaim the buffers.
150  *
151  * \param filp file pointer.
152  *
153  * Frees each buffer associated with \p filp not already on the hardware.
154  */
155 void drm_core_reclaim_buffers(drm_device_t * dev, struct file *filp)
156 {
157         drm_device_dma_t *dma = dev->dma;
158         int i;
159
160         if (!dma)
161                 return;
162         for (i = 0; i < dma->buf_count; i++) {
163                 if (dma->buflist[i]->filp == filp) {
164                         switch (dma->buflist[i]->list) {
165                         case DRM_LIST_NONE:
166                                 drm_free_buffer(dev, dma->buflist[i]);
167                                 break;
168                         case DRM_LIST_WAIT:
169                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
170                                 break;
171                         default:
172                                 /* Buffer already on hardware. */
173                                 break;
174                         }
175                 }
176         }
177 }
178
179 EXPORT_SYMBOL(drm_core_reclaim_buffers);