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, 451 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_fops.c b/drivers/char/drm/drm_fops.c
new file mode 100644
index 000000000000..906794247aeb
--- /dev/null
+++ b/drivers/char/drm/drm_fops.c
@@ -0,0 +1,451 @@
+/**
+ * \file drm_fops.h 
+ * File operations for DRM
+ * 
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Daryll Strauss <daryll@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
+ *
+ * Copyright 1999 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.
+ */
+
+#include "drmP.h"
+#include <linux/poll.h>
+
+static int drm_setup( drm_device_t *dev )
+{
+        int i;
+        int ret;
+
+        if (dev->driver->presetup)
+        {
+                ret=dev->driver->presetup(dev);
+                if (ret!=0) 
+                        return ret;
+        }
+
+        atomic_set( &dev->ioctl_count, 0 );
+        atomic_set( &dev->vma_count, 0 );
+        dev->buf_use = 0;
+        atomic_set( &dev->buf_alloc, 0 );
+
+        if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+        {
+                i = drm_dma_setup( dev );
+                if ( i < 0 )
+                        return i;
+        }
+
+        for ( i = 0 ; i < DRM_ARRAY_SIZE(dev->counts) ; i++ )
+                atomic_set( &dev->counts[i], 0 );
+
+        for ( i = 0 ; i < DRM_HASH_SIZE ; i++ ) {
+                dev->magiclist[i].head = NULL;
+                dev->magiclist[i].tail = NULL;
+        }
+
+        dev->maplist = drm_alloc(sizeof(*dev->maplist),
+                                  DRM_MEM_MAPS);
+        if(dev->maplist == NULL) return -ENOMEM;
+        memset(dev->maplist, 0, sizeof(*dev->maplist));
+        INIT_LIST_HEAD(&dev->maplist->head);
+
+        dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist),
+                                  DRM_MEM_CTXLIST);
+        if(dev->ctxlist == NULL) return -ENOMEM;
+        memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
+        INIT_LIST_HEAD(&dev->ctxlist->head);
+
+        dev->vmalist = NULL;
+        dev->sigdata.lock = dev->lock.hw_lock = NULL;
+        init_waitqueue_head( &dev->lock.lock_queue );
+        dev->queue_count = 0;
+        dev->queue_reserved = 0;
+        dev->queue_slots = 0;
+        dev->queuelist = NULL;
+        dev->irq_enabled = 0;
+        dev->context_flag = 0;
+        dev->interrupt_flag = 0;
+        dev->dma_flag = 0;
+        dev->last_context = 0;
+        dev->last_switch = 0;
+        dev->last_checked = 0;
+        init_waitqueue_head( &dev->context_wait );
+        dev->if_version = 0;
+
+        dev->ctx_start = 0;
+        dev->lck_start = 0;
+
+        dev->buf_rp = dev->buf;
+        dev->buf_wp = dev->buf;
+        dev->buf_end = dev->buf + DRM_BSZ;
+        dev->buf_async = NULL;
+        init_waitqueue_head( &dev->buf_readers );
+        init_waitqueue_head( &dev->buf_writers );
+
+        DRM_DEBUG( "\n" );
+
+        /*
+         * The kernel's context could be created here, but is now created
+         * in drm_dma_enqueue.  This is more resource-efficient for
+         * hardware that does not do DMA, but may mean that
+         * drm_select_queue fails between the time the interrupt is
+         * initialized and the time the queues are initialized.
+         */
+        if (dev->driver->postsetup)
+                dev->driver->postsetup(dev);
+
+        return 0;
+}
+
+/**
+ * Open file.
+ * 
+ * \param inode device inode
+ * \param filp file pointer.
+ * \return zero on success or a negative number on failure.
+ *
+ * Searches the DRM device with the same minor number, calls open_helper(), and
+ * increments the device open count. If the open count was previous at zero,
+ * i.e., it's the first that the device is open, then calls setup().
+ */
+int drm_open( struct inode *inode, struct file *filp )
+{
+        drm_device_t *dev = NULL;
+        int minor = iminor(inode);
+        int retcode = 0;
+
+        if (!((minor >= 0) && (minor < drm_cards_limit)))
+                return -ENODEV;
+                
+        if (!drm_heads[minor])
+                return -ENODEV;
+
+        if (!(dev = drm_heads[minor]->dev))
+                return -ENODEV;
+        
+        retcode = drm_open_helper( inode, filp, dev );
+        if ( !retcode ) {
+                atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
+                spin_lock( &dev->count_lock );
+                if ( !dev->open_count++ ) {
+                        spin_unlock( &dev->count_lock );
+                        return drm_setup( dev );
+                }
+                spin_unlock( &dev->count_lock );
+        }
+
+        return retcode;
+}
+EXPORT_SYMBOL(drm_open);
+
+/**
+ * Release file.
+ *
+ * \param inode device inode
+ * \param filp file pointer.
+ * \return zero on success or a negative number on failure.
+ *
+ * If the hardware lock is held then free it, and take it again for the kernel
+ * context since it's necessary to reclaim buffers. Unlink the file private
+ * data from its list and free it. Decreases the open count and if it reaches
+ * zero calls takedown().
+ */
+int drm_release( struct inode *inode, struct file *filp )
+{
+        drm_file_t *priv = filp->private_data;
+        drm_device_t *dev;
+        int retcode = 0;
+
+        lock_kernel();
+        dev = priv->head->dev;
+
+        DRM_DEBUG( "open_count = %d\n", dev->open_count );
+
+        if (dev->driver->prerelease)
+                dev->driver->prerelease(dev, filp);
+
+        /* ========================================================
+         * Begin inline drm_release
+         */
+
+        DRM_DEBUG( "pid = %d, device = 0x%lx, open_count = %d\n",
+                   current->pid, (long)old_encode_dev(priv->head->device), dev->open_count );
+
+        if ( priv->lock_count && dev->lock.hw_lock &&
+             _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
+             dev->lock.filp == filp ) {
+                DRM_DEBUG( "File %p released, freeing lock for context %d\n",
+                        filp,
+                        _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );
+                
+                if (dev->driver->release)
+                        dev->driver->release(dev, filp);
+
+                drm_lock_free( dev, &dev->lock.hw_lock->lock,
+                                _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );
+
+                                /* FIXME: may require heavy-handed reset of
+                                   hardware at this point, possibly
+                                   processed via a callback to the X
+                                   server. */
+        }
+        else if ( dev->driver->release && priv->lock_count && dev->lock.hw_lock ) {
+                /* The lock is required to reclaim buffers */
+                DECLARE_WAITQUEUE( entry, current );
+
+                add_wait_queue( &dev->lock.lock_queue, &entry );
+                for (;;) {
+                        __set_current_state(TASK_INTERRUPTIBLE);
+                        if ( !dev->lock.hw_lock ) {
+                                /* Device has been unregistered */
+                                retcode = -EINTR;
+                                break;
+                        }
+                        if ( drm_lock_take( &dev->lock.hw_lock->lock,
+                                             DRM_KERNEL_CONTEXT ) ) {
+                                dev->lock.filp      = filp;
+                                dev->lock.lock_time = jiffies;
+                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
+                                break;  /* Got lock */
+                        }
+                                /* Contention */
+                        schedule();
+                        if ( signal_pending( current ) ) {
+                                retcode = -ERESTARTSYS;
+                                break;
+                        }
+                }
+                __set_current_state(TASK_RUNNING);
+                remove_wait_queue( &dev->lock.lock_queue, &entry );
+                if( !retcode ) {
+                        if (dev->driver->release)
+                                dev->driver->release(dev, filp);
+                        drm_lock_free( dev, &dev->lock.hw_lock->lock,
+                                        DRM_KERNEL_CONTEXT );
+                }
+        }
+        
+        if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
+        {
+                dev->driver->reclaim_buffers(dev, filp);
+        }
+
+        drm_fasync( -1, filp, 0 );
+
+        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->tag == priv &&
+                             pos->handle != DRM_KERNEL_CONTEXT ) {
+                                if (dev->driver->context_dtor)
+                                        dev->driver->context_dtor(dev, pos->handle);
+
+                                drm_ctxbitmap_free( dev, pos->handle );
+
+                                list_del( &pos->head );
+                                drm_free( pos, sizeof(*pos), DRM_MEM_CTXLIST );
+                                --dev->ctx_count;
+                        }
+                }
+        }
+        up( &dev->ctxlist_sem );
+
+        down( &dev->struct_sem );
+        if ( priv->remove_auth_on_close == 1 ) {
+                drm_file_t *temp = dev->file_first;
+                while ( temp ) {
+                        temp->authenticated = 0;
+                        temp = temp->next;
+                }
+        }
+        if ( priv->prev ) {
+                priv->prev->next = priv->next;
+        } else {
+                dev->file_first  = priv->next;
+        }
+        if ( priv->next ) {
+                priv->next->prev = priv->prev;
+        } else {
+                dev->file_last   = priv->prev;
+        }
+        up( &dev->struct_sem );
+        
+        if (dev->driver->free_filp_priv)
+                dev->driver->free_filp_priv(dev, priv);
+
+        drm_free( priv, sizeof(*priv), DRM_MEM_FILES );
+
+        /* ========================================================
+         * End inline drm_release
+         */
+
+        atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
+        spin_lock( &dev->count_lock );
+        if ( !--dev->open_count ) {
+                if ( atomic_read( &dev->ioctl_count ) || dev->blocked ) {
+                        DRM_ERROR( "Device busy: %d %d\n",
+                                   atomic_read( &dev->ioctl_count ),
+                                   dev->blocked );
+                        spin_unlock( &dev->count_lock );
+                        unlock_kernel();
+                        return -EBUSY;
+                }
+                spin_unlock( &dev->count_lock );
+                unlock_kernel();
+                return drm_takedown( dev );
+        }
+        spin_unlock( &dev->count_lock );
+
+        unlock_kernel();
+
+        return retcode;
+}
+EXPORT_SYMBOL(drm_release);
+
+/**
+ * Called whenever a process opens /dev/drm. 
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param dev device.
+ * \return zero on success or a negative number on failure.
+ * 
+ * Creates and initializes a drm_file structure for the file private data in \p
+ * filp and add it into the double linked list in \p dev.
+ */
+int drm_open_helper(struct inode *inode, struct file *filp, drm_device_t *dev)
+{
+        int          minor = iminor(inode);
+        drm_file_t   *priv;
+        int ret;
+
+        if (filp->f_flags & O_EXCL)   return -EBUSY; /* No exclusive opens */
+        if (!drm_cpu_valid())        return -EINVAL;
+
+        DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
+
+        priv                = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
+        if(!priv) return -ENOMEM;
+
+        memset(priv, 0, sizeof(*priv));
+        filp->private_data  = priv;
+        priv->uid           = current->euid;
+        priv->pid           = current->pid;
+        priv->minor         = minor;
+        priv->head          = drm_heads[minor];
+        priv->ioctl_count   = 0;
+        priv->authenticated = capable(CAP_SYS_ADMIN);
+        priv->lock_count    = 0;
+
+        if (dev->driver->open_helper) {
+                ret=dev->driver->open_helper(dev, priv);
+                if (ret < 0)
+                        goto out_free;
+        }
+
+        down(&dev->struct_sem);
+        if (!dev->file_last) {
+                priv->next      = NULL;
+                priv->prev      = NULL;
+                dev->file_first = priv;
+                dev->file_last  = priv;
+        } else {
+                priv->next           = NULL;
+                priv->prev           = dev->file_last;
+                dev->file_last->next = priv;
+                dev->file_last       = priv;
+        }
+        up(&dev->struct_sem);
+
+#ifdef __alpha__
+        /*
+         * Default the hose
+         */
+        if (!dev->hose) {
+                struct pci_dev *pci_dev;
+                pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
+                if (pci_dev) {
+                        dev->hose = pci_dev->sysdata;
+                        pci_dev_put(pci_dev);
+                }
+                if (!dev->hose) {
+                        struct pci_bus *b = pci_bus_b(pci_root_buses.next);
+                        if (b) dev->hose = b->sysdata;
+                }
+        }
+#endif
+
+        return 0;
+out_free:
+        drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
+        filp->private_data=NULL;
+        return ret;
+}
+
+/** No-op. */
+int drm_flush(struct file *filp)
+{
+        drm_file_t    *priv   = filp->private_data;
+        drm_device_t  *dev    = priv->head->dev;
+
+        DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
+                  current->pid, (long)old_encode_dev(priv->head->device), dev->open_count);
+        return 0;
+}
+EXPORT_SYMBOL(drm_flush);
+
+/** No-op. */
+int drm_fasync(int fd, struct file *filp, int on)
+{
+        drm_file_t    *priv   = filp->private_data;
+        drm_device_t  *dev    = priv->head->dev;
+        int           retcode;
+
+        DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, (long)old_encode_dev(priv->head->device));
+        retcode = fasync_helper(fd, filp, on, &dev->buf_async);
+        if (retcode < 0) return retcode;
+        return 0;
+}
+EXPORT_SYMBOL(drm_fasync);
+
+/** No-op. */
+unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
+{
+        return 0;
+}
+EXPORT_SYMBOL(drm_poll);
+
+
+/** No-op. */
+ssize_t drm_read(struct file *filp, char __user *buf, size_t count, loff_t *off)
+{
+        return 0;
+}