1 /* tdfx_context.c -- IOCTLs for tdfx contexts -*- linux-c -*-
2 * Created: Thu Oct 7 10:50:22 1999 by faith@precisioninsight.com
3 * Revised: Sat Oct 9 23:39:56 1999 by faith@precisioninsight.com
5 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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:
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
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.
27 * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/tdfx_context.c,v 1.2 2000/02/23 04:47:30 martin Exp $
31 #include <linux/sched.h>
33 #define __NO_VERSION__
37 extern drm_ctx_t tdfx_res_ctx;
39 static int tdfx_alloc_queue(drm_device_t *dev)
41 static int context = 0;
43 return ++context; /* Should this reuse contexts in the future? */
46 int tdfx_context_switch(drm_device_t *dev, int old, int new)
50 atomic_inc(&dev->total_ctx);
52 if (test_and_set_bit(0, &dev->context_flag)) {
53 DRM_ERROR("Reentering -- FIXME\n");
58 dev->ctx_start = get_cycles();
61 DRM_DEBUG("Context switch from %d to %d\n", old, new);
63 if (new == dev->last_context) {
64 clear_bit(0, &dev->context_flag);
68 if (drm_flags & DRM_FLAG_NOCTX) {
69 tdfx_context_switch_complete(dev, new);
71 sprintf(buf, "C %d %d\n", old, new);
72 drm_write_string(dev, buf);
78 int tdfx_context_switch_complete(drm_device_t *dev, int new)
80 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
81 dev->last_switch = jiffies;
83 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
84 DRM_ERROR("Lock isn't held after context switch\n");
87 /* If a context switch is ever initiated
88 when the kernel holds the lock, release
91 atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
95 clear_bit(0, &dev->context_flag);
96 wake_up(&dev->context_wait);
102 int tdfx_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
109 DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
110 copy_from_user_ret(&res, (drm_ctx_res_t *)arg, sizeof(res), -EFAULT);
111 if (res.count >= DRM_RESERVED_CONTEXTS) {
112 memset(&ctx, 0, sizeof(ctx));
113 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
115 copy_to_user_ret(&res.contexts[i],
121 res.count = DRM_RESERVED_CONTEXTS;
122 copy_to_user_ret((drm_ctx_res_t *)arg, &res, sizeof(res), -EFAULT);
127 int tdfx_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
130 drm_file_t *priv = filp->private_data;
131 drm_device_t *dev = priv->dev;
134 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
135 if ((ctx.handle = tdfx_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
136 /* Skip kernel's context and get a new one. */
137 ctx.handle = tdfx_alloc_queue(dev);
139 DRM_DEBUG("%d\n", ctx.handle);
140 copy_to_user_ret((drm_ctx_t *)arg, &ctx, sizeof(ctx), -EFAULT);
144 int tdfx_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
149 copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
150 if (ctx.flags==_DRM_CONTEXT_PRESERVED)
151 tdfx_res_ctx.handle=ctx.handle;
155 int tdfx_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
160 copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
161 /* This is 0, because we don't hanlde any context flags */
163 copy_to_user_ret((drm_ctx_t*)arg, &ctx, sizeof(ctx), -EFAULT);
167 int tdfx_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
170 drm_file_t *priv = filp->private_data;
171 drm_device_t *dev = priv->dev;
174 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
175 DRM_DEBUG("%d\n", ctx.handle);
176 return tdfx_context_switch(dev, dev->last_context, ctx.handle);
179 int tdfx_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
182 drm_file_t *priv = filp->private_data;
183 drm_device_t *dev = priv->dev;
186 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
187 DRM_DEBUG("%d\n", ctx.handle);
188 tdfx_context_switch_complete(dev, ctx.handle);
193 int tdfx_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
198 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
199 DRM_DEBUG("%d\n", ctx.handle);
200 /* This is currently a noop because we
201 don't reuse context values. Perhaps we