1 /* mga_context.c -- IOCTLs for mga contexts -*- linux-c -*-
2 * Created: Mon Dec 13 09:51:35 1999 by faith@precisioninsight.com
3 *
4 * Copyright 1999 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 * Jeff Hartmann <jhartmann@valinux.com>
29 *
30 */
31
32 #define __NO_VERSION__
33 #include "drmP.h"
34 #include "mga_drv.h"
35
mga_alloc_queue(drm_device_t * dev)36 static int mga_alloc_queue(drm_device_t *dev)
37 {
38 return drm_ctxbitmap_next(dev);
39 }
40
mga_context_switch(drm_device_t * dev,int old,int new)41 int mga_context_switch(drm_device_t *dev, int old, int new)
42 {
43 char buf[64];
44
45 atomic_inc(&dev->total_ctx);
46
47 if (test_and_set_bit(0, &dev->context_flag)) {
48 DRM_ERROR("Reentering -- FIXME\n");
49 return -EBUSY;
50 }
51
52 #if DRM_DMA_HISTOGRAM
53 dev->ctx_start = get_cycles();
54 #endif
55
56 DRM_DEBUG("Context switch from %d to %d\n", old, new);
57
58 if (new == dev->last_context) {
59 clear_bit(0, &dev->context_flag);
60 return 0;
61 }
62
63 if (drm_flags & DRM_FLAG_NOCTX) {
64 mga_context_switch_complete(dev, new);
65 } else {
66 sprintf(buf, "C %d %d\n", old, new);
67 drm_write_string(dev, buf);
68 }
69
70 return 0;
71 }
72
mga_context_switch_complete(drm_device_t * dev,int new)73 int mga_context_switch_complete(drm_device_t *dev, int new)
74 {
75 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
76 dev->last_switch = jiffies;
77
78 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
79 DRM_ERROR("Lock isn't held after context switch\n");
80 }
81
82 /* If a context switch is ever initiated
83 when the kernel holds the lock, release
84 that lock here. */
85 #if DRM_DMA_HISTOGRAM
86 atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
87 - dev->ctx_start)]);
88
89 #endif
90 clear_bit(0, &dev->context_flag);
91 wake_up(&dev->context_wait);
92
93 return 0;
94 }
95
mga_resctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)96 int mga_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
97 unsigned long arg)
98 {
99 drm_ctx_res_t res;
100 drm_ctx_t ctx;
101 int i;
102
103 if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))
104 return -EFAULT;
105 if (res.count >= DRM_RESERVED_CONTEXTS) {
106 memset(&ctx, 0, sizeof(ctx));
107 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
108 ctx.handle = i;
109 if (copy_to_user(&res.contexts[i],
110 &i,
111 sizeof(i)))
112 return -EFAULT;
113 }
114 }
115 res.count = DRM_RESERVED_CONTEXTS;
116 if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
117 return -EFAULT;
118 return 0;
119 }
120
mga_addctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)121 int mga_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
122 unsigned long arg)
123 {
124 drm_file_t *priv = filp->private_data;
125 drm_device_t *dev = priv->dev;
126 drm_ctx_t ctx;
127
128 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
129 return -EFAULT;
130 if ((ctx.handle = mga_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
131 /* Skip kernel's context and get a new one. */
132 ctx.handle = mga_alloc_queue(dev);
133 }
134 if (ctx.handle == -1) {
135 return -ENOMEM;
136 }
137 DRM_DEBUG("%d\n", ctx.handle);
138 if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
139 return -EFAULT;
140 return 0;
141 }
142
mga_modctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)143 int mga_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
144 unsigned long arg)
145 {
146 /* This does nothing for the mga */
147 return 0;
148 }
149
mga_getctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)150 int mga_getctx(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 /* This is 0, because we don't hanlde any context flags */
158 ctx.flags = 0;
159 if (copy_to_user((drm_ctx_t*)arg, &ctx, sizeof(ctx)))
160 return -EFAULT;
161 return 0;
162 }
163
mga_switchctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)164 int mga_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
165 unsigned long arg)
166 {
167 drm_file_t *priv = filp->private_data;
168 drm_device_t *dev = priv->dev;
169 drm_ctx_t ctx;
170
171 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
172 return -EFAULT;
173 DRM_DEBUG("%d\n", ctx.handle);
174 return mga_context_switch(dev, dev->last_context, ctx.handle);
175 }
176
mga_newctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)177 int mga_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
178 unsigned long arg)
179 {
180 drm_file_t *priv = filp->private_data;
181 drm_device_t *dev = priv->dev;
182 drm_ctx_t ctx;
183
184 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
185 return -EFAULT;
186 DRM_DEBUG("%d\n", ctx.handle);
187 mga_context_switch_complete(dev, ctx.handle);
188
189 return 0;
190 }
191
mga_rmctx(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long arg)192 int mga_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
193 unsigned long arg)
194 {
195 drm_file_t *priv = filp->private_data;
196 drm_device_t *dev = priv->dev;
197 drm_ctx_t ctx;
198
199 if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
200 return -EFAULT;
201 DRM_DEBUG("%d\n", ctx.handle);
202 if(ctx.handle == DRM_KERNEL_CONTEXT+1) priv->remove_auth_on_close = 1;
203
204 if(ctx.handle != DRM_KERNEL_CONTEXT) {
205 drm_ctxbitmap_free(dev, ctx.handle);
206 }
207
208 return 0;
209 }
210