diff options
Diffstat (limited to 'linux/tdfx_context.c')
| -rw-r--r-- | linux/tdfx_context.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/linux/tdfx_context.c b/linux/tdfx_context.c new file mode 100644 index 00000000..0c3c541d --- /dev/null +++ b/linux/tdfx_context.c @@ -0,0 +1,206 @@ +/* tdfx_context.c -- IOCTLs for tdfx contexts -*- linux-c -*- + * Created: Thu Oct 7 10:50:22 1999 by faith@precisioninsight.com + * Revised: Sat Oct 9 23:39:56 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * $PI$ + * $XFree86$ + * + */ + +#include <linux/sched.h> + +#define __NO_VERSION__ +#include "drmP.h" +#include "tdfx_drv.h" + +extern drm_ctx_t tdfx_res_ctx; + +static int tdfx_alloc_queue(drm_device_t *dev) +{ + static int context = 0; + + return ++context; /* Should this reuse contexts in the future? */ +} + +int tdfx_context_switch(drm_device_t *dev, int old, int new) +{ + char buf[64]; + + atomic_inc(&dev->total_ctx); + + if (test_and_set_bit(0, &dev->context_flag)) { + DRM_ERROR("Reentering -- FIXME\n"); + return -EBUSY; + } + +#if DRM_DMA_HISTOGRAM + dev->ctx_start = get_cycles(); +#endif + + DRM_DEBUG("Context switch from %d to %d\n", old, new); + + if (new == dev->last_context) { + clear_bit(0, &dev->context_flag); + return 0; + } + + if (drm_flags & DRM_FLAG_NOCTX) { + tdfx_context_switch_complete(dev, new); + } else { + sprintf(buf, "C %d %d\n", old, new); + drm_write_string(dev, buf); + } + + return 0; +} + +int tdfx_context_switch_complete(drm_device_t *dev, int new) +{ + dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ + dev->last_switch = jiffies; + + if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { + DRM_ERROR("Lock isn't held after context switch\n"); + } + + /* If a context switch is ever initiated + when the kernel holds the lock, release + that lock here. */ +#if DRM_DMA_HISTOGRAM + atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles() + - dev->ctx_start)]); + +#endif + clear_bit(0, &dev->context_flag); + wake_up(&dev->context_wait); + + return 0; +} + + +int tdfx_resctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_ctx_res_t res; + drm_ctx_t ctx; + int i; + + DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS); + copy_from_user_ret(&res, (drm_ctx_res_t *)arg, sizeof(res), -EFAULT); + if (res.count >= DRM_RESERVED_CONTEXTS) { + memset(&ctx, 0, sizeof(ctx)); + for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { + ctx.handle = i; + copy_to_user_ret(&res.contexts[i], + &i, + sizeof(i), + -EFAULT); + } + } + res.count = DRM_RESERVED_CONTEXTS; + copy_to_user_ret((drm_ctx_res_t *)arg, &res, sizeof(res), -EFAULT); + return 0; +} + + +int tdfx_addctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->dev; + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT); + if ((ctx.handle = tdfx_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) { + /* Skip kernel's context and get a new one. */ + ctx.handle = tdfx_alloc_queue(dev); + } + DRM_DEBUG("%d\n", ctx.handle); + copy_to_user_ret((drm_ctx_t *)arg, &ctx, sizeof(ctx), -EFAULT); + return 0; +} + +int tdfx_modctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT); + if (ctx.flags==_DRM_CONTEXT_PRESERVED) + tdfx_res_ctx.handle=ctx.handle; + return 0; +} + +int tdfx_getctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT); + /* This is 0, because we don't hanlde any context flags */ + ctx.flags = 0; + copy_to_user_ret((drm_ctx_t*)arg, &ctx, sizeof(ctx), -EFAULT); + return 0; +} + +int tdfx_switchctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->dev; + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT); + DRM_DEBUG("%d\n", ctx.handle); + return tdfx_context_switch(dev, dev->last_context, ctx.handle); +} + +int tdfx_newctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->dev; + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT); + DRM_DEBUG("%d\n", ctx.handle); + tdfx_context_switch_complete(dev, ctx.handle); + + return 0; +} + +int tdfx_rmctx(struct inode *inode, struct file *filp, unsigned int cmd, + unsigned long arg) +{ + drm_ctx_t ctx; + + copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT); + DRM_DEBUG("%d\n", ctx.handle); + /* This is currently a noop because we + don't reuse context values. Perhaps we + should? */ + + return 0; +} |