1 /* r128_context.c -- IOCTLs for r128 contexts -*- linux-c -*-
2 * Created: Mon Dec 13 09:51:35 1999 by faith@precisioninsight.com
3 *
4 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
28 *
29 */
30
31 #define __NO_VERSION__
32 #include "drmP.h"
33 #include "r128_drv.h"
34
35 extern drm_ctx_t r128_res_ctx;
36
r128_alloc_queue(drm_device_t * dev)37 static int r128_alloc_queue(drm_device_t *dev)
38 {
39 return drm_ctxbitmap_next(dev);
40 }
41
r128_context_switch(drm_device_t * dev,int old,int new)42 int r128_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 r128_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
r128_context_switch_complete(drm_device_t * dev,int new)74 int r128_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
r128_resctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)98 int r128_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],
113 &i,
114 sizeof(i)))
115 return -EFAULT;
116 }
117 }
118 res.count = DRM_RESERVED_CONTEXTS;
119 if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
120 return -EFAULT;
121 return 0;
122 }
123
124
r128_addctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)125 int r128_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
126 unsigned long arg)
127 {
128 drm_file_t *priv = filp->private_data;
129 drm_device_t *dev = priv->dev;
130 drm_ctx_t ctx;
131
132 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
133 return -EFAULT;
134 if ((ctx.handle = r128_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
135 /* Skip kernel's context and get a new one. */
136 ctx.handle = r128_alloc_queue(dev);
137 }
138 DRM_DEBUG("%d\n", ctx.handle);
139 if (ctx.handle == -1) {
140 DRM_DEBUG("Not enough free contexts.\n");
141 /* Should this return -EBUSY instead? */
142 return -ENOMEM;
143 }
144
145 if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
146 return -EFAULT;
147 return 0;
148 }
149
r128_modctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)150 int r128_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
151 unsigned long arg)
152 {
153 drm_ctx_t ctx;
154
155 if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))
156 return -EFAULT;
157 if (ctx.flags==_DRM_CONTEXT_PRESERVED)
158 r128_res_ctx.handle=ctx.handle;
159 return 0;
160 }
161
r128_getctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)162 int r128_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
163 unsigned long arg)
164 {
165 drm_ctx_t ctx;
166
167 if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))
168 return -EFAULT;
169 /* This is 0, because we don't hanlde any context flags */
170 ctx.flags = 0;
171 if (copy_to_user((drm_ctx_t*)arg, &ctx, sizeof(ctx)))
172 return -EFAULT;
173 return 0;
174 }
175
r128_switchctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)176 int r128_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
177 unsigned long arg)
178 {
179 drm_file_t *priv = filp->private_data;
180 drm_device_t *dev = priv->dev;
181 drm_ctx_t ctx;
182
183 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
184 return -EFAULT;
185 DRM_DEBUG("%d\n", ctx.handle);
186 return r128_context_switch(dev, dev->last_context, ctx.handle);
187 }
188
r128_newctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)189 int r128_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
190 unsigned long arg)
191 {
192 drm_file_t *priv = filp->private_data;
193 drm_device_t *dev = priv->dev;
194 drm_ctx_t ctx;
195
196 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
197 return -EFAULT;
198 DRM_DEBUG("%d\n", ctx.handle);
199 r128_context_switch_complete(dev, ctx.handle);
200
201 return 0;
202 }
203
r128_rmctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)204 int r128_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
205 unsigned long arg)
206 {
207 drm_file_t *priv = filp->private_data;
208 drm_device_t *dev = priv->dev;
209 drm_ctx_t ctx;
210
211 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
212 return -EFAULT;
213 DRM_DEBUG("%d\n", ctx.handle);
214 drm_ctxbitmap_free(dev, ctx.handle);
215
216 return 0;
217 }
218