1 /* radeon_context.c -- IOCTLs for Radeon contexts -*- linux-c -*-
2 *
3 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
4 * Copyright 2000 VA Linux Systems, Inc., Fremont, California.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
16 * Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 * DEALINGS IN THE SOFTWARE.
25 *
26 * Author: Kevin E. Martin <martin@valinux.com>
27 * Rickard E. (Rik) Faith <faith@valinux.com>
28 *
29 */
30
31 #define __NO_VERSION__
32 #include "drmP.h"
33 #include "radeon_drv.h"
34
35 extern drm_ctx_t radeon_res_ctx;
36
radeon_alloc_queue(drm_device_t * dev)37 static int radeon_alloc_queue(drm_device_t *dev)
38 {
39 return drm_ctxbitmap_next(dev);
40 }
41
radeon_context_switch(drm_device_t * dev,int old,int new)42 int radeon_context_switch(drm_device_t *dev, int old, int new)
43 {
44 char buf[64];
45
46 atomic_inc(&dev->total_ctx);
47
48 if (test_and_set_bit(0, &dev->context_flag)) {
49 DRM_ERROR("Reentering -- FIXME\n");
50 return -EBUSY;
51 }
52
53 #if DRM_DMA_HISTOGRAM
54 dev->ctx_start = get_cycles();
55 #endif
56
57 DRM_DEBUG("Context switch from %d to %d\n", old, new);
58
59 if (new == dev->last_context) {
60 clear_bit(0, &dev->context_flag);
61 return 0;
62 }
63
64 if (drm_flags & DRM_FLAG_NOCTX) {
65 radeon_context_switch_complete(dev, new);
66 } else {
67 sprintf(buf, "C %d %d\n", old, new);
68 drm_write_string(dev, buf);
69 }
70
71 return 0;
72 }
73
radeon_context_switch_complete(drm_device_t * dev,int new)74 int radeon_context_switch_complete(drm_device_t *dev, int new)
75 {
76 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
77 dev->last_switch = jiffies;
78
79 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
80 DRM_ERROR("Lock isn't held after context switch\n");
81 }
82
83 /* If a context switch is ever initiated
84 when the kernel holds the lock, release
85 that lock here. */
86 #if DRM_DMA_HISTOGRAM
87 atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
88 - dev->ctx_start)]);
89
90 #endif
91 clear_bit(0, &dev->context_flag);
92 wake_up(&dev->context_wait);
93
94 return 0;
95 }
96
97
radeon_resctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)98 int radeon_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
99 unsigned long arg)
100 {
101 drm_ctx_res_t res;
102 drm_ctx_t ctx;
103 int i;
104
105 DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
106 if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))
107 return -EFAULT;
108 if (res.count >= DRM_RESERVED_CONTEXTS) {
109 memset(&ctx, 0, sizeof(ctx));
110 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
111 ctx.handle = i;
112 if (copy_to_user(&res.contexts[i], &i, sizeof(i)))
113 return -EFAULT;
114 }
115 }
116 res.count = DRM_RESERVED_CONTEXTS;
117 if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
118 return -EFAULT;
119 return 0;
120 }
121
122
radeon_addctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)123 int radeon_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
124 unsigned long arg)
125 {
126 drm_file_t *priv = filp->private_data;
127 drm_device_t *dev = priv->dev;
128 drm_ctx_t ctx;
129
130 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
131 return -EFAULT;
132 if ((ctx.handle = radeon_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
133 /* Skip kernel's context and get a new one. */
134 ctx.handle = radeon_alloc_queue(dev);
135 }
136 DRM_DEBUG("%d\n", ctx.handle);
137 if (ctx.handle == -1) {
138 DRM_DEBUG("Not enough free contexts.\n");
139 /* Should this return -EBUSY instead? */
140 return -ENOMEM;
141 }
142
143 if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
144 return -EFAULT;
145 return 0;
146 }
147
radeon_modctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)148 int radeon_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
149 unsigned long arg)
150 {
151 drm_ctx_t ctx;
152
153 if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))
154 return -EFAULT;
155 if (ctx.flags==_DRM_CONTEXT_PRESERVED)
156 radeon_res_ctx.handle=ctx.handle;
157 return 0;
158 }
159
radeon_getctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)160 int radeon_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
161 unsigned long arg)
162 {
163 drm_ctx_t ctx;
164
165 if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))
166 return -EFAULT;
167 /* This is 0, because we don't hanlde any context flags */
168 ctx.flags = 0;
169 if (copy_to_user((drm_ctx_t*)arg, &ctx, sizeof(ctx)))
170 return -EFAULT;
171 return 0;
172 }
173
radeon_switchctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)174 int radeon_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
175 unsigned long arg)
176 {
177 drm_file_t *priv = filp->private_data;
178 drm_device_t *dev = priv->dev;
179 drm_ctx_t ctx;
180
181 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
182 return -EFAULT;
183 DRM_DEBUG("%d\n", ctx.handle);
184 return radeon_context_switch(dev, dev->last_context, ctx.handle);
185 }
186
radeon_newctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)187 int radeon_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
188 unsigned long arg)
189 {
190 drm_file_t *priv = filp->private_data;
191 drm_device_t *dev = priv->dev;
192 drm_ctx_t ctx;
193
194 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
195 return -EFAULT;
196 DRM_DEBUG("%d\n", ctx.handle);
197 radeon_context_switch_complete(dev, ctx.handle);
198
199 return 0;
200 }
201
radeon_rmctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)202 int radeon_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
203 unsigned long arg)
204 {
205 drm_file_t *priv = filp->private_data;
206 drm_device_t *dev = priv->dev;
207 drm_ctx_t ctx;
208
209 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
210 return -EFAULT;
211 DRM_DEBUG("%d\n", ctx.handle);
212 drm_ctxbitmap_free(dev, ctx.handle);
213
214 return 0;
215 }
216