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-rw-r--r--drivers/char/drm/drm_context.c578
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 000000000000..f15c86c57875
--- /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;
+}
+
+/*@}*/
+
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