Merge tag 'cxl-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[platform/kernel/linux-rpi.git] / drivers / gpu / 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 <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, DRIVER_HAVE_DMA) ||
57             !drm_core_check_feature(dev, DRIVER_LEGACY))
58                 return 0;
59
60         dev->buf_use = 0;
61         atomic_set(&dev->buf_alloc, 0);
62
63         dev->dma = kzalloc(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, DRIVER_HAVE_DMA) ||
88             !drm_core_check_feature(dev, 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,
106                                                           dmah->size,
107                                                           dmah->vaddr,
108                                                           dmah->busaddr);
109                                         kfree(dmah);
110                                 }
111                         }
112                         kfree(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(dma->bufs[i].buflist[j].dev_private);
117                         }
118                         kfree(dma->bufs[i].buflist);
119                 }
120         }
121
122         kfree(dma->buflist);
123         kfree(dma->pagelist);
124         kfree(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, 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 }