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/* mga_context.c -- IOCTLs for mga contexts -*- linux-c -*-
* Created: Mon Dec 13 09:51:35 1999 by faith@precisioninsight.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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.
*
* Author: Rickard E. (Rik) Faith <faith@valinux.com>
* Jeff Hartmann <jhartmann@valinux.com>
*
*/
#define __NO_VERSION__
#include "drmP.h"
#include "mga_drv.h"
#include <linux/sched.h>
static int mga_alloc_queue(drm_device_t *dev)
{
int temp = drm_ctxbitmap_next(dev);
DRM_DEBUG("mga_alloc_queue: %d\n", temp);
return temp;
}
int mga_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) {
mga_context_switch_complete(dev, new);
} else {
sprintf(buf, "C %d %d\n", old, new);
drm_write_string(dev, buf);
}
return 0;
}
int mga_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 mga_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 mga_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 = mga_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
/* Skip kernel's context and get a new one. */
ctx.handle = mga_alloc_queue(dev);
}
if (ctx.handle == -1) {
DRM_DEBUG("Not enough free contexts.\n");
/* Should this return -EBUSY instead? */
return -ENOMEM;
}
DRM_DEBUG("%d\n", ctx.handle);
copy_to_user_ret((drm_ctx_t *)arg, &ctx, sizeof(ctx), -EFAULT);
return 0;
}
int mga_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
/* This does nothing for the mga */
return 0;
}
int mga_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 mga_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 mga_context_switch(dev, dev->last_context, ctx.handle);
}
int mga_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);
mga_context_switch_complete(dev, ctx.handle);
return 0;
}
int mga_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);
if(ctx.handle != DRM_KERNEL_CONTEXT) {
drm_ctxbitmap_free(dev, ctx.handle);
}
return 0;
}
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