/* tdfx_context.c -- IOCTLs for tdfx contexts -*- linux-c -*- * Created: Thu Oct 7 10:50:22 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. * * Authors: Rickard E. (Rik) Faith * Daryll Strauss * * $XFree86$ * */ #include #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) { return drm_ctxbitmap_next(dev); } 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); if (ctx.handle == -1) { DRM_DEBUG("Not enough free contexts.\n"); /* Should this return -EBUSY instead? */ return -ENOMEM; } 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_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); drm_ctxbitmap_free(dev, ctx.handle); return 0; }