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/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
* Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
*
* Copyright 1999, 2000 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
* VA LINUX SYSTEMS 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 <faith@valinux.com>
* Gareth Hughes <gareth@valinux.com>
*/
/* ================================================================
* Context bitmap support
*/
void DRM(ctxbitmap_free)( drm_device_t *dev, int ctx_handle )
{
if ( ctx_handle < 0 ) goto failed;
if ( ctx_handle < DRM_MAX_CTXBITMAP ) {
clear_bit( ctx_handle, dev->ctx_bitmap );
return;
}
failed:
DRM_ERROR( "Attempt to free invalid context handle: %d\n",
ctx_handle );
return;
}
int DRM(ctxbitmap_next)( drm_device_t *dev )
{
int bit;
bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
if ( bit < DRM_MAX_CTXBITMAP ) {
set_bit( bit, dev->ctx_bitmap );
DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit );
return bit;
}
return -1;
}
int DRM(ctxbitmap_init)( drm_device_t *dev )
{
int i;
int temp;
dev->ctx_bitmap = (unsigned long *) DRM(alloc)( PAGE_SIZE,
DRM_MEM_CTXBITMAP );
if ( dev->ctx_bitmap == NULL ) {
return -ENOMEM;
}
memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
temp = DRM(ctxbitmap_next)( dev );
DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp );
}
return 0;
}
void DRM(ctxbitmap_cleanup)( drm_device_t *dev )
{
DRM(free)( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );
}
/* ================================================================
* The actual DRM context handling routines
*/
int DRM(context_switch)( drm_device_t *dev, int old, int new )
{
char buf[64];
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 ) {
DRM(context_switch_complete)( dev, new );
} else {
sprintf( buf, "C %d %d\n", old, new );
DRM(write_string)( dev, buf );
}
return 0;
}
int DRM(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 DRM(resctx)( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_ctx_res_t res;
drm_ctx_t ctx;
int i;
if ( copy_from_user( &res, (drm_ctx_res_t *)arg, sizeof(res) ) )
return -EFAULT;
if ( res.count >= DRM_RESERVED_CONTEXTS ) {
memset( &ctx, 0, sizeof(ctx) );
for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
ctx.handle = i;
if ( copy_to_user( &res.contexts[i],
&i, sizeof(i) ) )
return -EFAULT;
}
}
res.count = DRM_RESERVED_CONTEXTS;
if ( copy_to_user( (drm_ctx_res_t *)arg, &res, sizeof(res) ) )
return -EFAULT;
return 0;
}
int DRM(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;
if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
return -EFAULT;
ctx.handle = DRM(ctxbitmap_next)( dev );
if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
/* Skip kernel's context and get a new one. */
ctx.handle = DRM(ctxbitmap_next)( 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;
}
if ( copy_to_user( (drm_ctx_t *)arg, &ctx, sizeof(ctx) ) )
return -EFAULT;
return 0;
}
int DRM(modctx)( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
/* This does nothing */
return 0;
}
int DRM(getctx)( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_ctx_t ctx;
if ( copy_from_user( &ctx, (drm_ctx_t*)arg, sizeof(ctx) ) )
return -EFAULT;
/* This is 0, because we don't handle any context flags */
ctx.flags = 0;
if ( copy_to_user( (drm_ctx_t*)arg, &ctx, sizeof(ctx) ) )
return -EFAULT;
return 0;
}
int DRM(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;
if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
return -EFAULT;
DRM_DEBUG( "%d\n", ctx.handle );
return DRM(context_switch)( dev, dev->last_context, ctx.handle );
}
int DRM(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;
if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
return -EFAULT;
DRM_DEBUG( "%d\n", ctx.handle );
DRM(context_switch_complete)( dev, ctx.handle );
return 0;
}
int DRM(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;
if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
return -EFAULT;
DRM_DEBUG( "%d\n", ctx.handle );
if ( ctx.handle == DRM_KERNEL_CONTEXT + 1 ) {
priv->remove_auth_on_close = 1;
}
if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
DRM(ctxbitmap_free)( dev, ctx.handle );
}
return 0;
}
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