1d0d7f3ee4
locking, and the apparently unnecessary locking for -stable has been removed. This may fix issues with missed interrupts since April, which manifested themselves as slowdowns or hangs in radeon, in particular. Many cleanups also took place. In the shared code, there are improvements to r128 driver stability.
166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
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* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
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*
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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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* $FreeBSD$
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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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static drm_file_t *DRM(find_file)(drm_device_t *dev, drm_magic_t magic)
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{
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drm_file_t *retval = NULL;
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drm_magic_entry_t *pt;
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int hash = DRM(hash_magic)(magic);
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DRM_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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retval = pt->priv;
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break;
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}
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}
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DRM_UNLOCK();
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return retval;
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}
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static int DRM(add_magic)(drm_device_t *dev, drm_file_t *priv, 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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hash = DRM(hash_magic)(magic);
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entry = (drm_magic_entry_t*) DRM(alloc)(sizeof(*entry), DRM_MEM_MAGIC);
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if (!entry) return DRM_ERR(ENOMEM);
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memset(entry, 0, sizeof(*entry));
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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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DRM_LOCK();
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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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DRM_UNLOCK();
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return 0;
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}
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static int DRM(remove_magic)(drm_device_t *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_DEBUG("%d\n", magic);
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hash = DRM(hash_magic)(magic);
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DRM_LOCK();
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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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DRM_UNLOCK();
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return 0;
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}
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}
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DRM_UNLOCK();
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DRM(free)(pt, sizeof(*pt), DRM_MEM_MAGIC);
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return DRM_ERR(EINVAL);
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}
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int DRM(getmagic)(DRM_IOCTL_ARGS)
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{
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static drm_magic_t sequence = 0;
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drm_auth_t auth;
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drm_file_t *priv;
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DRM_DEVICE;
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DRM_GET_PRIV_WITH_RETURN(priv, filp);
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/* Find unique magic */
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if (priv->magic) {
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auth.magic = priv->magic;
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} else {
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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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priv->magic = auth.magic;
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DRM(add_magic)(dev, priv, auth.magic);
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}
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DRM_DEBUG("%u\n", auth.magic);
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DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof(auth));
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return 0;
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}
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int DRM(authmagic)(DRM_IOCTL_ARGS)
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{
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drm_auth_t auth;
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drm_file_t *file;
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DRM_DEVICE;
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DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof(auth));
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DRM_DEBUG("%u\n", auth.magic);
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if ((file = DRM(find_file)(dev, auth.magic))) {
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file->authenticated = 1;
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DRM(remove_magic)(dev, auth.magic);
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return 0;
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}
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return DRM_ERR(EINVAL);
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}
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