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589 lines
15 KiB
589 lines
15 KiB
/**
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* \file drm_context.h
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* IOCTLs for generic contexts
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* ChangeLog:
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* 2001-11-16 Torsten Duwe <duwe@caldera.de>
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* added context constructor/destructor hooks,
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* needed by SiS driver's memory management.
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*/
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#include "drmP.h"
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/******************************************************************/
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/** \name Context bitmap support */
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/*@{*/
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/**
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* Free a handle from the context bitmap.
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*
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* \param dev DRM device.
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* \param ctx_handle context handle.
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*
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* Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
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* in drm_device::context_sareas, while holding the drm_device::struct_sem
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* lock.
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*/
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void drm_ctxbitmap_free( drm_device_t *dev, int ctx_handle )
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{
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if ( ctx_handle < 0 ) goto failed;
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if ( !dev->ctx_bitmap ) goto failed;
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if ( ctx_handle < DRM_MAX_CTXBITMAP ) {
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down(&dev->struct_sem);
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clear_bit( ctx_handle, dev->ctx_bitmap );
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dev->context_sareas[ctx_handle] = NULL;
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up(&dev->struct_sem);
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return;
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}
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failed:
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DRM_ERROR( "Attempt to free invalid context handle: %d\n",
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ctx_handle );
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return;
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}
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/**
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* Context bitmap allocation.
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*
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* \param dev DRM device.
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* \return (non-negative) context handle on success or a negative number on failure.
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*
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* Find the first zero bit in drm_device::ctx_bitmap and (re)allocates
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* drm_device::context_sareas to accommodate the new entry while holding the
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* drm_device::struct_sem lock.
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*/
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static int drm_ctxbitmap_next( drm_device_t *dev )
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{
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int bit;
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if(!dev->ctx_bitmap) return -1;
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down(&dev->struct_sem);
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bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
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if ( bit < DRM_MAX_CTXBITMAP ) {
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set_bit( bit, dev->ctx_bitmap );
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DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit );
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if((bit+1) > dev->max_context) {
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dev->max_context = (bit+1);
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if(dev->context_sareas) {
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drm_map_t **ctx_sareas;
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ctx_sareas = drm_realloc(dev->context_sareas,
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(dev->max_context - 1) *
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sizeof(*dev->context_sareas),
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dev->max_context *
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sizeof(*dev->context_sareas),
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DRM_MEM_MAPS);
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if(!ctx_sareas) {
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clear_bit(bit, dev->ctx_bitmap);
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up(&dev->struct_sem);
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return -1;
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}
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dev->context_sareas = ctx_sareas;
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dev->context_sareas[bit] = NULL;
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} else {
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/* max_context == 1 at this point */
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dev->context_sareas = drm_alloc(
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dev->max_context *
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sizeof(*dev->context_sareas),
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DRM_MEM_MAPS);
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if(!dev->context_sareas) {
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clear_bit(bit, dev->ctx_bitmap);
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up(&dev->struct_sem);
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return -1;
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}
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dev->context_sareas[bit] = NULL;
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}
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}
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up(&dev->struct_sem);
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return bit;
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}
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up(&dev->struct_sem);
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return -1;
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}
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/**
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* Context bitmap initialization.
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*
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* \param dev DRM device.
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*
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* Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding
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* the drm_device::struct_sem lock.
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*/
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int drm_ctxbitmap_init( drm_device_t *dev )
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{
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int i;
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int temp;
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down(&dev->struct_sem);
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dev->ctx_bitmap = (unsigned long *) drm_alloc( PAGE_SIZE,
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DRM_MEM_CTXBITMAP );
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if ( dev->ctx_bitmap == NULL ) {
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up(&dev->struct_sem);
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return -ENOMEM;
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}
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memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
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dev->context_sareas = NULL;
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dev->max_context = -1;
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up(&dev->struct_sem);
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for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
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temp = drm_ctxbitmap_next( dev );
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DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp );
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}
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return 0;
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}
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/**
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* Context bitmap cleanup.
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*
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* \param dev DRM device.
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*
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* Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding
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* the drm_device::struct_sem lock.
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*/
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void drm_ctxbitmap_cleanup( drm_device_t *dev )
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{
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down(&dev->struct_sem);
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if( dev->context_sareas ) drm_free( dev->context_sareas,
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sizeof(*dev->context_sareas) *
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dev->max_context,
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DRM_MEM_MAPS );
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drm_free( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );
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up(&dev->struct_sem);
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}
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/*@}*/
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/******************************************************************/
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/** \name Per Context SAREA Support */
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/*@{*/
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/**
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* Get per-context SAREA.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx_priv_map structure.
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* \return zero on success or a negative number on failure.
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*
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* Gets the map from drm_device::context_sareas with the handle specified and
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* returns its handle.
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*/
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int drm_getsareactx(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_ctx_priv_map_t __user *argp = (void __user *)arg;
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drm_ctx_priv_map_t request;
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drm_map_t *map;
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drm_map_list_t *_entry;
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if (copy_from_user(&request, argp, sizeof(request)))
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return -EFAULT;
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down(&dev->struct_sem);
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if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
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up(&dev->struct_sem);
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return -EINVAL;
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}
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map = dev->context_sareas[request.ctx_id];
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up(&dev->struct_sem);
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request.handle = 0;
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list_for_each_entry(_entry, &dev->maplist->head,head) {
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if (_entry->map == map) {
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request.handle = (void *)(unsigned long)_entry->user_token;
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break;
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}
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}
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if (request.handle == 0)
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return -EINVAL;
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if (copy_to_user(argp, &request, sizeof(request)))
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return -EFAULT;
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return 0;
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}
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/**
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* Set per-context SAREA.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx_priv_map structure.
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* \return zero on success or a negative number on failure.
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*
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* Searches the mapping specified in \p arg and update the entry in
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* drm_device::context_sareas with it.
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*/
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int drm_setsareactx(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_ctx_priv_map_t request;
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drm_map_t *map = NULL;
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drm_map_list_t *r_list = NULL;
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struct list_head *list;
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if (copy_from_user(&request,
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(drm_ctx_priv_map_t __user *)arg,
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sizeof(request)))
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return -EFAULT;
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down(&dev->struct_sem);
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list_for_each(list, &dev->maplist->head) {
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r_list = list_entry(list, drm_map_list_t, head);
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if (r_list->map
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&& r_list->user_token == (unsigned long) request.handle)
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goto found;
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}
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bad:
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up(&dev->struct_sem);
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return -EINVAL;
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found:
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map = r_list->map;
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if (!map) goto bad;
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if (dev->max_context < 0)
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goto bad;
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if (request.ctx_id >= (unsigned) dev->max_context)
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goto bad;
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dev->context_sareas[request.ctx_id] = map;
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up(&dev->struct_sem);
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return 0;
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}
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/*@}*/
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/******************************************************************/
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/** \name The actual DRM context handling routines */
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/*@{*/
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/**
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* Switch context.
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*
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* \param dev DRM device.
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* \param old old context handle.
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* \param new new context handle.
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* \return zero on success or a negative number on failure.
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*
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* Attempt to set drm_device::context_flag.
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*/
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int drm_context_switch( drm_device_t *dev, int old, int new )
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{
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if ( test_and_set_bit( 0, &dev->context_flag ) ) {
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DRM_ERROR( "Reentering -- FIXME\n" );
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return -EBUSY;
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}
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DRM_DEBUG( "Context switch from %d to %d\n", old, new );
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if ( new == dev->last_context ) {
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clear_bit( 0, &dev->context_flag );
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return 0;
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}
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return 0;
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}
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/**
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* Complete context switch.
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*
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* \param dev DRM device.
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* \param new new context handle.
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* \return zero on success or a negative number on failure.
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*
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* Updates drm_device::last_context and drm_device::last_switch. Verifies the
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* hardware lock is held, clears the drm_device::context_flag and wakes up
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* drm_device::context_wait.
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*/
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static int drm_context_switch_complete( drm_device_t *dev, int new )
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{
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dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
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dev->last_switch = jiffies;
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if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
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DRM_ERROR( "Lock isn't held after context switch\n" );
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}
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/* If a context switch is ever initiated
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when the kernel holds the lock, release
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that lock here. */
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clear_bit( 0, &dev->context_flag );
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wake_up( &dev->context_wait );
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return 0;
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}
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/**
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* Reserve contexts.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx_res structure.
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* \return zero on success or a negative number on failure.
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*/
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int drm_resctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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drm_ctx_res_t res;
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drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
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int i;
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if ( copy_from_user( &res, argp, sizeof(res) ) )
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return -EFAULT;
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if ( res.count >= DRM_RESERVED_CONTEXTS ) {
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memset( &ctx, 0, sizeof(ctx) );
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for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
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ctx.handle = i;
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if ( copy_to_user( &res.contexts[i],
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&ctx, sizeof(ctx) ) )
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return -EFAULT;
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}
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}
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res.count = DRM_RESERVED_CONTEXTS;
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if ( copy_to_user( argp, &res, sizeof(res) ) )
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return -EFAULT;
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return 0;
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}
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/**
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* Add context.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Get a new handle for the context and copy to userspace.
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*/
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int drm_addctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_ctx_list_t * ctx_entry;
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drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
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if ( copy_from_user( &ctx, argp, sizeof(ctx) ) )
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return -EFAULT;
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ctx.handle = drm_ctxbitmap_next( dev );
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if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
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/* Skip kernel's context and get a new one. */
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ctx.handle = drm_ctxbitmap_next( dev );
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}
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DRM_DEBUG( "%d\n", ctx.handle );
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if ( ctx.handle == -1 ) {
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DRM_DEBUG( "Not enough free contexts.\n" );
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/* Should this return -EBUSY instead? */
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return -ENOMEM;
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}
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if ( ctx.handle != DRM_KERNEL_CONTEXT )
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{
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if (dev->driver->context_ctor)
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dev->driver->context_ctor(dev, ctx.handle);
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}
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ctx_entry = drm_alloc( sizeof(*ctx_entry), DRM_MEM_CTXLIST );
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if ( !ctx_entry ) {
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DRM_DEBUG("out of memory\n");
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return -ENOMEM;
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}
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INIT_LIST_HEAD( &ctx_entry->head );
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ctx_entry->handle = ctx.handle;
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ctx_entry->tag = priv;
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down( &dev->ctxlist_sem );
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list_add( &ctx_entry->head, &dev->ctxlist->head );
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++dev->ctx_count;
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up( &dev->ctxlist_sem );
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if ( copy_to_user( argp, &ctx, sizeof(ctx) ) )
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return -EFAULT;
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return 0;
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}
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int drm_modctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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/* This does nothing */
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return 0;
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}
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|
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/**
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* Get context.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx structure.
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* \return zero on success or a negative number on failure.
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*/
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int drm_getctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
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if ( copy_from_user( &ctx, argp, sizeof(ctx) ) )
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return -EFAULT;
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/* This is 0, because we don't handle any context flags */
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ctx.flags = 0;
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if ( copy_to_user( argp, &ctx, sizeof(ctx) ) )
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return -EFAULT;
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return 0;
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}
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|
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/**
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* Switch context.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument pointing to a drm_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls context_switch().
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*/
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int drm_switchctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_ctx_t ctx;
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if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) )
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return -EFAULT;
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DRM_DEBUG( "%d\n", ctx.handle );
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return drm_context_switch( dev, dev->last_context, ctx.handle );
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}
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|
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/**
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* New context.
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*
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* \param inode device inode.
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* \param filp file pointer.
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|
* \param cmd command.
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|
* \param arg user argument pointing to a drm_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls context_switch_complete().
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|
*/
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|
int drm_newctx( struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg )
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|
{
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|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->head->dev;
|
|
drm_ctx_t ctx;
|
|
|
|
if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) )
|
|
return -EFAULT;
|
|
|
|
DRM_DEBUG( "%d\n", ctx.handle );
|
|
drm_context_switch_complete( dev, ctx.handle );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Remove context.
|
|
*
|
|
* \param inode device inode.
|
|
* \param filp file pointer.
|
|
* \param cmd command.
|
|
* \param arg user argument pointing to a drm_ctx structure.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
|
|
*/
|
|
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->head->dev;
|
|
drm_ctx_t ctx;
|
|
|
|
if ( copy_from_user( &ctx, (drm_ctx_t __user *)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 ) {
|
|
if (dev->driver->context_dtor)
|
|
dev->driver->context_dtor(dev, ctx.handle);
|
|
drm_ctxbitmap_free( dev, ctx.handle );
|
|
}
|
|
|
|
down( &dev->ctxlist_sem );
|
|
if ( !list_empty( &dev->ctxlist->head ) ) {
|
|
drm_ctx_list_t *pos, *n;
|
|
|
|
list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) {
|
|
if ( pos->handle == ctx.handle ) {
|
|
list_del( &pos->head );
|
|
drm_free( pos, sizeof(*pos), DRM_MEM_CTXLIST );
|
|
--dev->ctx_count;
|
|
}
|
|
}
|
|
}
|
|
up( &dev->ctxlist_sem );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*@}*/
|
|
|
|
|