Linux-2.6.12-rc2v2.6.12-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!

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;
+}
+
+/*@}*/
+