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f00755f06b
will ease the identification of memory leaks as the OS will be able to track allocations for us by malloc type. vmstat -m will show all of the allocations. Convert the calls to drm_alloc() and friends, which are used in shared code to static __inline__ while we are here. Approved by: jhb (mentor)
191 lines
4.7 KiB
C
191 lines
4.7 KiB
C
/*-
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/** @file drm_auth.c
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* Implementation of the get/authmagic ioctls implementing the authentication
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* scheme between the master and clients.
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*/
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#include "dev/drm/drmP.h"
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static int drm_hash_magic(drm_magic_t magic)
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{
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return magic & (DRM_HASH_SIZE-1);
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}
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/**
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* Returns the file private associated with the given magic number.
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*/
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static struct drm_file *drm_find_file(struct drm_device *dev, drm_magic_t magic)
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{
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drm_magic_entry_t *pt;
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int hash = drm_hash_magic(magic);
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DRM_SPINLOCK_ASSERT(&dev->dev_lock);
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for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
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if (pt->magic == magic) {
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return pt->priv;
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}
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}
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return NULL;
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}
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/**
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* Inserts the given magic number into the hash table of used magic number
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* lists.
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*/
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static int drm_add_magic(struct drm_device *dev, struct drm_file *priv,
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drm_magic_t magic)
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{
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int hash;
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drm_magic_entry_t *entry;
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DRM_DEBUG("%d\n", magic);
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DRM_SPINLOCK_ASSERT(&dev->dev_lock);
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hash = drm_hash_magic(magic);
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entry = malloc(sizeof(*entry), DRM_MEM_MAGIC, M_ZERO | M_NOWAIT);
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if (!entry)
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return ENOMEM;
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entry->magic = magic;
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entry->priv = priv;
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entry->next = NULL;
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if (dev->magiclist[hash].tail) {
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dev->magiclist[hash].tail->next = entry;
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dev->magiclist[hash].tail = entry;
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} else {
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dev->magiclist[hash].head = entry;
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dev->magiclist[hash].tail = entry;
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}
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return 0;
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}
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/**
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* Removes the given magic number from the hash table of used magic number
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* lists.
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*/
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static int drm_remove_magic(struct drm_device *dev, drm_magic_t magic)
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{
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drm_magic_entry_t *prev = NULL;
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drm_magic_entry_t *pt;
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int hash;
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DRM_SPINLOCK_ASSERT(&dev->dev_lock);
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DRM_DEBUG("%d\n", magic);
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hash = drm_hash_magic(magic);
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for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
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if (pt->magic == magic) {
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if (dev->magiclist[hash].head == pt) {
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dev->magiclist[hash].head = pt->next;
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}
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if (dev->magiclist[hash].tail == pt) {
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dev->magiclist[hash].tail = prev;
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}
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if (prev) {
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prev->next = pt->next;
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}
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free(pt, DRM_MEM_MAGIC);
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return 0;
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}
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}
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return EINVAL;
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}
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/**
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* Called by the client, this returns a unique magic number to be authorized
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* by the master.
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*
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* The master may use its own knowledge of the client (such as the X
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* connection that the magic is passed over) to determine if the magic number
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* should be authenticated.
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*/
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int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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static drm_magic_t sequence = 0;
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struct drm_auth *auth = data;
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/* Find unique magic */
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if (file_priv->magic) {
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auth->magic = file_priv->magic;
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} else {
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DRM_LOCK();
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do {
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int old = sequence;
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auth->magic = old+1;
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if (!atomic_cmpset_int(&sequence, old, auth->magic))
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continue;
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} while (drm_find_file(dev, auth->magic));
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file_priv->magic = auth->magic;
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drm_add_magic(dev, file_priv, auth->magic);
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DRM_UNLOCK();
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}
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DRM_DEBUG("%u\n", auth->magic);
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return 0;
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}
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/**
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* Marks the client associated with the given magic number as authenticated.
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*/
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int drm_authmagic(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_auth *auth = data;
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struct drm_file *priv;
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DRM_DEBUG("%u\n", auth->magic);
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DRM_LOCK();
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priv = drm_find_file(dev, auth->magic);
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if (priv != NULL) {
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priv->authenticated = 1;
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drm_remove_magic(dev, auth->magic);
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DRM_UNLOCK();
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return 0;
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} else {
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DRM_UNLOCK();
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return EINVAL;
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}
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}
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