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!

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_auth.c b/drivers/char/drm/drm_auth.c
new file mode 100644
index 00000000000..b428761c4e9
--- /dev/null
+++ b/drivers/char/drm/drm_auth.c
@@ -0,0 +1,230 @@
+/**
+ * \file drm_auth.h 
+ * IOCTLs for authentication
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Tue Feb  2 08:37:54 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"
+
+/**
+ * Generate a hash key from a magic.
+ *
+ * \param magic magic.
+ * \return hash key.
+ *
+ * The key is the modulus of the hash table size, #DRM_HASH_SIZE, which must be
+ * a power of 2.
+ */
+static int drm_hash_magic(drm_magic_t magic)
+{
+	return magic & (DRM_HASH_SIZE-1);
+}
+
+/**
+ * Find the file with the given magic number.
+ *
+ * \param dev DRM device.
+ * \param magic magic number.
+ *
+ * Searches in drm_device::magiclist within all files with the same hash key
+ * the one with matching magic number, while holding the drm_device::struct_sem
+ * lock.
+ */
+static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
+{
+	drm_file_t	  *retval = NULL;
+	drm_magic_entry_t *pt;
+	int		  hash	  = drm_hash_magic(magic);
+
+	down(&dev->struct_sem);
+	for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
+		if (pt->magic == magic) {
+			retval = pt->priv;
+			break;
+		}
+	}
+	up(&dev->struct_sem);
+	return retval;
+}
+
+/**
+ * Adds a magic number.
+ * 
+ * \param dev DRM device.
+ * \param priv file private data.
+ * \param magic magic number.
+ *
+ * Creates a drm_magic_entry structure and appends to the linked list
+ * associated the magic number hash key in drm_device::magiclist, while holding
+ * the drm_device::struct_sem lock.
+ */
+int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
+{
+	int		  hash;
+	drm_magic_entry_t *entry;
+
+	DRM_DEBUG("%d\n", magic);
+
+	hash	     = drm_hash_magic(magic);
+	entry	     = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
+	if (!entry) return -ENOMEM;
+	memset(entry, 0, sizeof(*entry));
+	entry->magic = magic;
+	entry->priv  = priv;
+	entry->next  = NULL;
+
+	down(&dev->struct_sem);
+	if (dev->magiclist[hash].tail) {
+		dev->magiclist[hash].tail->next = entry;
+		dev->magiclist[hash].tail	= entry;
+	} else {
+		dev->magiclist[hash].head	= entry;
+		dev->magiclist[hash].tail	= entry;
+	}
+	up(&dev->struct_sem);
+
+	return 0;
+}
+
+/**
+ * Remove a magic number.
+ * 
+ * \param dev DRM device.
+ * \param magic magic number.
+ *
+ * Searches and unlinks the entry in drm_device::magiclist with the magic
+ * number hash key, while holding the drm_device::struct_sem lock.
+ */
+int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
+{
+	drm_magic_entry_t *prev = NULL;
+	drm_magic_entry_t *pt;
+	int		  hash;
+
+
+	DRM_DEBUG("%d\n", magic);
+	hash = drm_hash_magic(magic);
+
+	down(&dev->struct_sem);
+	for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
+		if (pt->magic == magic) {
+			if (dev->magiclist[hash].head == pt) {
+				dev->magiclist[hash].head = pt->next;
+			}
+			if (dev->magiclist[hash].tail == pt) {
+				dev->magiclist[hash].tail = prev;
+			}
+			if (prev) {
+				prev->next = pt->next;
+			}
+			up(&dev->struct_sem);
+			return 0;
+		}
+	}
+	up(&dev->struct_sem);
+
+	drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
+
+	return -EINVAL;
+}
+
+/**
+ * Get a unique magic number (ioctl).
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg pointer to a resulting drm_auth structure.
+ * \return zero on success, or a negative number on failure.
+ *
+ * If there is a magic number in drm_file::magic then use it, otherwise
+ * searches an unique non-zero magic number and add it associating it with \p
+ * filp.
+ */
+int drm_getmagic(struct inode *inode, struct file *filp,
+		  unsigned int cmd, unsigned long arg)
+{
+	static drm_magic_t sequence = 0;
+	static DEFINE_SPINLOCK(lock);
+	drm_file_t	   *priv    = filp->private_data;
+	drm_device_t	   *dev	    = priv->head->dev;
+	drm_auth_t	   auth;
+
+				/* Find unique magic */
+	if (priv->magic) {
+		auth.magic = priv->magic;
+	} else {
+		do {
+			spin_lock(&lock);
+			if (!sequence) ++sequence; /* reserve 0 */
+			auth.magic = sequence++;
+			spin_unlock(&lock);
+		} while (drm_find_file(dev, auth.magic));
+		priv->magic = auth.magic;
+		drm_add_magic(dev, priv, auth.magic);
+	}
+
+	DRM_DEBUG("%u\n", auth.magic);
+	if (copy_to_user((drm_auth_t __user *)arg, &auth, sizeof(auth)))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Authenticate with a magic.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg pointer to a drm_auth structure.
+ * \return zero if authentication successed, or a negative number otherwise.
+ *
+ * Checks if \p filp is associated with the magic number passed in \arg.
+ */
+int drm_authmagic(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_auth_t	   auth;
+	drm_file_t	   *file;
+
+	if (copy_from_user(&auth, (drm_auth_t __user *)arg, sizeof(auth)))
+		return -EFAULT;
+	DRM_DEBUG("%u\n", auth.magic);
+	if ((file = drm_find_file(dev, auth.magic))) {
+		file->authenticated = 1;
+		drm_remove_magic(dev, auth.magic);
+		return 0;
+	}
+	return -EINVAL;
+}