diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/drm/drm_context.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/char/drm/drm_context.c')
-rw-r--r-- | drivers/char/drm/drm_context.c | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_context.c b/drivers/char/drm/drm_context.c new file mode 100644 index 0000000..f15c86c --- /dev/null +++ b/drivers/char/drm/drm_context.c @@ -0,0 +1,578 @@ +/** + * \file drm_context.h + * IOCTLs for generic contexts + * + * \author Rickard E. (Rik) Faith <faith@valinux.com> + * \author Gareth Hughes <gareth@valinux.com> + */ + +/* + * 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. + */ + +/* + * ChangeLog: + * 2001-11-16 Torsten Duwe <duwe@caldera.de> + * added context constructor/destructor hooks, + * needed by SiS driver's memory management. + */ + +#include "drmP.h" + +/******************************************************************/ +/** \name Context bitmap support */ +/*@{*/ + +/** + * Free a handle from the context bitmap. + * + * \param dev DRM device. + * \param ctx_handle context handle. + * + * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry + * in drm_device::context_sareas, while holding the drm_device::struct_sem + * lock. + */ +void drm_ctxbitmap_free( drm_device_t *dev, int ctx_handle ) +{ + if ( ctx_handle < 0 ) goto failed; + if ( !dev->ctx_bitmap ) goto failed; + + if ( ctx_handle < DRM_MAX_CTXBITMAP ) { + down(&dev->struct_sem); + clear_bit( ctx_handle, dev->ctx_bitmap ); + dev->context_sareas[ctx_handle] = NULL; + up(&dev->struct_sem); + return; + } +failed: + DRM_ERROR( "Attempt to free invalid context handle: %d\n", + ctx_handle ); + return; +} + +/** + * Context bitmap allocation. + * + * \param dev DRM device. + * \return (non-negative) context handle on success or a negative number on failure. + * + * Find the first zero bit in drm_device::ctx_bitmap and (re)allocates + * drm_device::context_sareas to accommodate the new entry while holding the + * drm_device::struct_sem lock. + */ +int drm_ctxbitmap_next( drm_device_t *dev ) +{ + int bit; + + if(!dev->ctx_bitmap) return -1; + + down(&dev->struct_sem); + 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 ); + if((bit+1) > dev->max_context) { + dev->max_context = (bit+1); + if(dev->context_sareas) { + drm_map_t **ctx_sareas; + + ctx_sareas = drm_realloc(dev->context_sareas, + (dev->max_context - 1) * + sizeof(*dev->context_sareas), + dev->max_context * + sizeof(*dev->context_sareas), + DRM_MEM_MAPS); + if(!ctx_sareas) { + clear_bit(bit, dev->ctx_bitmap); + up(&dev->struct_sem); + return -1; + } + dev->context_sareas = ctx_sareas; + dev->context_sareas[bit] = NULL; + } else { + /* max_context == 1 at this point */ + dev->context_sareas = drm_alloc( + dev->max_context * + sizeof(*dev->context_sareas), + DRM_MEM_MAPS); + if(!dev->context_sareas) { + clear_bit(bit, dev->ctx_bitmap); + up(&dev->struct_sem); + return -1; + } + dev->context_sareas[bit] = NULL; + } + } + up(&dev->struct_sem); + return bit; + } + up(&dev->struct_sem); + return -1; +} + +/** + * Context bitmap initialization. + * + * \param dev DRM device. + * + * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding + * the drm_device::struct_sem lock. + */ +int drm_ctxbitmap_init( drm_device_t *dev ) +{ + int i; + int temp; + + down(&dev->struct_sem); + dev->ctx_bitmap = (unsigned long *) drm_alloc( PAGE_SIZE, + DRM_MEM_CTXBITMAP ); + if ( dev->ctx_bitmap == NULL ) { + up(&dev->struct_sem); + return -ENOMEM; + } + memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE ); + dev->context_sareas = NULL; + dev->max_context = -1; + up(&dev->struct_sem); + + for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { + temp = drm_ctxbitmap_next( dev ); + DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp ); + } + + return 0; +} + +/** + * Context bitmap cleanup. + * + * \param dev DRM device. + * + * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding + * the drm_device::struct_sem lock. + */ +void drm_ctxbitmap_cleanup( drm_device_t *dev ) +{ + down(&dev->struct_sem); + if( dev->context_sareas ) drm_free( dev->context_sareas, + sizeof(*dev->context_sareas) * + dev->max_context, + DRM_MEM_MAPS ); + drm_free( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP ); + up(&dev->struct_sem); +} + +/*@}*/ + +/******************************************************************/ +/** \name Per Context SAREA Support */ +/*@{*/ + +/** + * Get per-context SAREA. + * + * \param inode device inode. + * \param filp file pointer. + * \param cmd command. + * \param arg user argument pointing to a drm_ctx_priv_map structure. + * \return zero on success or a negative number on failure. + * + * Gets the map from drm_device::context_sareas with the handle specified and + * returns its handle. + */ +int drm_getsareactx(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_priv_map_t __user *argp = (void __user *)arg; + drm_ctx_priv_map_t request; + drm_map_t *map; + + if (copy_from_user(&request, argp, sizeof(request))) + return -EFAULT; + + down(&dev->struct_sem); + if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) { + up(&dev->struct_sem); + return -EINVAL; + } + + map = dev->context_sareas[request.ctx_id]; + up(&dev->struct_sem); + + request.handle = map->handle; + if (copy_to_user(argp, &request, sizeof(request))) + return -EFAULT; + return 0; +} + +/** + * Set per-context SAREA. + * + * \param inode device inode. + * \param filp file pointer. + * \param cmd command. + * \param arg user argument pointing to a drm_ctx_priv_map structure. + * \return zero on success or a negative number on failure. + * + * Searches the mapping specified in \p arg and update the entry in + * drm_device::context_sareas with it. + */ +int drm_setsareactx(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_priv_map_t request; + drm_map_t *map = NULL; + drm_map_list_t *r_list = NULL; + struct list_head *list; + + if (copy_from_user(&request, + (drm_ctx_priv_map_t __user *)arg, + sizeof(request))) + return -EFAULT; + + down(&dev->struct_sem); + list_for_each(list, &dev->maplist->head) { + r_list = list_entry(list, drm_map_list_t, head); + if(r_list->map && + r_list->map->handle == request.handle) + goto found; + } +bad: + up(&dev->struct_sem); + return -EINVAL; + +found: + map = r_list->map; + if (!map) goto bad; + if (dev->max_context < 0) + goto bad; + if (request.ctx_id >= (unsigned) dev->max_context) + goto bad; + dev->context_sareas[request.ctx_id] = map; + up(&dev->struct_sem); + return 0; +} + +/*@}*/ + +/******************************************************************/ +/** \name The actual DRM context handling routines */ +/*@{*/ + +/** + * Switch context. + * + * \param dev DRM device. + * \param old old context handle. + * \param new new context handle. + * \return zero on success or a negative number on failure. + * + * Attempt to set drm_device::context_flag. + */ +int drm_context_switch( drm_device_t *dev, int old, int new ) +{ + if ( test_and_set_bit( 0, &dev->context_flag ) ) { + DRM_ERROR( "Reentering -- FIXME\n" ); + return -EBUSY; + } + + + DRM_DEBUG( "Context switch from %d to %d\n", old, new ); + + if ( new == dev->last_context ) { + clear_bit( 0, &dev->context_flag ); + return 0; + } + + return 0; +} + +/** + * Complete context switch. + * + * \param dev DRM device. + * \param new new context handle. + * \return zero on success or a negative number on failure. + * + * Updates drm_device::last_context and drm_device::last_switch. Verifies the + * hardware lock is held, clears the drm_device::context_flag and wakes up + * drm_device::context_wait. + */ +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. */ + clear_bit( 0, &dev->context_flag ); + wake_up( &dev->context_wait ); + + return 0; +} + +/** + * Reserve contexts. + * + * \param inode device inode. + * \param filp file pointer. + * \param cmd command. + * \param arg user argument pointing to a drm_ctx_res structure. + * \return zero on success or a negative number on failure. + */ +int drm_resctx( struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg ) +{ + drm_ctx_res_t res; + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + int i; + + if ( copy_from_user( &res, argp, 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( argp, &res, sizeof(res) ) ) + return -EFAULT; + return 0; +} + +/** + * Add 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. + * + * Get a new handle for the context and copy to userspace. + */ +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->head->dev; + drm_ctx_list_t * ctx_entry; + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + + if ( copy_from_user( &ctx, argp, 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 ( ctx.handle != DRM_KERNEL_CONTEXT ) + { + if (dev->driver->context_ctor) + dev->driver->context_ctor(dev, ctx.handle); + } + + ctx_entry = drm_alloc( sizeof(*ctx_entry), DRM_MEM_CTXLIST ); + if ( !ctx_entry ) { + DRM_DEBUG("out of memory\n"); + return -ENOMEM; + } + + INIT_LIST_HEAD( &ctx_entry->head ); + ctx_entry->handle = ctx.handle; + ctx_entry->tag = priv; + + down( &dev->ctxlist_sem ); + list_add( &ctx_entry->head, &dev->ctxlist->head ); + ++dev->ctx_count; + up( &dev->ctxlist_sem ); + + if ( copy_to_user( argp, &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; +} + +/** + * Get 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. + */ +int drm_getctx( struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg ) +{ + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + + if ( copy_from_user( &ctx, argp, sizeof(ctx) ) ) + return -EFAULT; + + /* This is 0, because we don't handle any context flags */ + ctx.flags = 0; + + if ( copy_to_user( argp, &ctx, sizeof(ctx) ) ) + return -EFAULT; + return 0; +} + +/** + * Switch 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. + * + * Calls context_switch(). + */ +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->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 ); + return drm_context_switch( dev, dev->last_context, ctx.handle ); +} + +/** + * New 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. + * + * Calls context_switch_complete(). + */ +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->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; +} + +/*@}*/ + |