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 return drm_ctxbitmap_next(dev);
44 int tdfx_context_switch(drm_device_t *dev, int old, int new)
48 atomic_inc(&dev->total_ctx);
50 if (test_and_set_bit(0, &dev->context_flag)) {
51 DRM_ERROR("Reentering -- FIXME\n");
56 dev->ctx_start = get_cycles();
59 DRM_DEBUG("Context switch from %d to %d\n", old, new);
61 if (new == dev->last_context) {
62 clear_bit(0, &dev->context_flag);
66 if (drm_flags & DRM_FLAG_NOCTX) {
67 tdfx_context_switch_complete(dev, new);
69 sprintf(buf, "C %d %d\n", old, new);
70 drm_write_string(dev, buf);
76 int tdfx_context_switch_complete(drm_device_t *dev, int new)
78 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
79 dev->last_switch = jiffies;
81 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
82 DRM_ERROR("Lock isn't held after context switch\n");
85 /* If a context switch is ever initiated
86 when the kernel holds the lock, release
89 atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
93 clear_bit(0, &dev->context_flag);
94 wake_up(&dev->context_wait);
100 int tdfx_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
107 DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
108 copy_from_user_ret(&res, (drm_ctx_res_t *)arg, sizeof(res), -EFAULT);
109 if (res.count >= DRM_RESERVED_CONTEXTS) {
110 memset(&ctx, 0, sizeof(ctx));
111 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
113 copy_to_user_ret(&res.contexts[i],
119 res.count = DRM_RESERVED_CONTEXTS;
120 copy_to_user_ret((drm_ctx_res_t *)arg, &res, sizeof(res), -EFAULT);
125 int tdfx_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
128 drm_file_t *priv = filp->private_data;
129 drm_device_t *dev = priv->dev;
132 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
133 if ((ctx.handle = tdfx_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
134 /* Skip kernel's context and get a new one. */
135 ctx.handle = tdfx_alloc_queue(dev);
137 DRM_DEBUG("%d\n", ctx.handle);
138 if (ctx.handle == -1) {
139 DRM_DEBUG("Not enough free contexts.\n");
140 /* Should this return -EBUSY instead? */
144 copy_to_user_ret((drm_ctx_t *)arg, &ctx, sizeof(ctx), -EFAULT);
148 int tdfx_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
153 copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
154 if (ctx.flags==_DRM_CONTEXT_PRESERVED)
155 tdfx_res_ctx.handle=ctx.handle;
159 int tdfx_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
164 copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
165 /* This is 0, because we don't hanlde any context flags */
167 copy_to_user_ret((drm_ctx_t*)arg, &ctx, sizeof(ctx), -EFAULT);
171 int tdfx_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
174 drm_file_t *priv = filp->private_data;
175 drm_device_t *dev = priv->dev;
178 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
179 DRM_DEBUG("%d\n", ctx.handle);
180 return tdfx_context_switch(dev, dev->last_context, ctx.handle);
183 int tdfx_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
186 drm_file_t *priv = filp->private_data;
187 drm_device_t *dev = priv->dev;
190 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
191 DRM_DEBUG("%d\n", ctx.handle);
192 tdfx_context_switch_complete(dev, ctx.handle);
197 int tdfx_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
200 drm_file_t *priv = filp->private_data;
201 drm_device_t *dev = priv->dev;
204 copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
205 DRM_DEBUG("%d\n", ctx.handle);
206 drm_ctxbitmap_free(dev, ctx.handle);