drm_fops.c revision 60405de4d8688d96dd05157c28db3ade5c9bc234
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Use is subject to license terms.
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/* BEGIN CSTYLED */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/* drm_fops.h -- File operations for DRM -*- linux-c -*-
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*-
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * All Rights Reserved.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Permission is hereby granted, free of charge, to any person obtaining a
60405de4d8688d96dd05157c28db3ade5c9bc234kz * copy of this software and associated documentation files (the "Software"),
60405de4d8688d96dd05157c28db3ade5c9bc234kz * to deal in the Software without restriction, including without limitation
60405de4d8688d96dd05157c28db3ade5c9bc234kz * the rights to use, copy, modify, merge, publish, distribute, sublicense,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * and/or sell copies of the Software, and to permit persons to whom the
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Software is furnished to do so, subject to the following conditions:
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * The above copyright notice and this permission notice (including the next
60405de4d8688d96dd05157c28db3ade5c9bc234kz * paragraph) shall be included in all copies or substantial portions of the
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Software.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
60405de4d8688d96dd05157c28db3ade5c9bc234kz * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * OTHER DEALINGS IN THE SOFTWARE.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Authors:
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Rickard E. (Rik) Faith <faith@valinux.com>
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Daryll Strauss <daryll@valinux.com>
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Gareth Hughes <gareth@valinux.com>
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/* END CSTYLED */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz#pragma ident "%Z%%M% %I% %E% SMI"
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz#include "drmP.h"
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*ARGSUSED*/
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_file_t *
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_find_file_by_proc(drm_device_t *dev, cred_t *p)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz pid_t pid = ddi_get_pid();
60405de4d8688d96dd05157c28db3ade5c9bc234kz drm_file_t *priv;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz TAILQ_FOREACH(priv, &dev->files, link)
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (priv->pid == pid)
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (priv);
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (NULL);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/* drm_open_helper is called whenever a process opens /dev/drm. */
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*ARGSUSED*/
60405de4d8688d96dd05157c28db3ade5c9bc234kzint
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_open_helper(drm_softstate_t *dev, int flags, int otyp, cred_t *credp)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz drm_file_t *priv;
60405de4d8688d96dd05157c28db3ade5c9bc234kz pid_t pid;
60405de4d8688d96dd05157c28db3ade5c9bc234kz int retcode;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (flags & FEXCL)
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (DRM_ERR(EBUSY)); /* No exclusive opens */
60405de4d8688d96dd05157c28db3ade5c9bc234kz dev->flags = flags;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz pid = ddi_get_pid();
60405de4d8688d96dd05157c28db3ade5c9bc234kz DRM_DEBUG("drm_open_helper :pid = %d", pid);
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz DRM_LOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv = drm_find_file_by_proc(dev, credp);
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (priv) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->refs++;
60405de4d8688d96dd05157c28db3ade5c9bc234kz } else {
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv = drm_alloc(sizeof (*priv), DRM_MEM_FILES);
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (priv == NULL) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (DRM_ERR(ENOMEM));
60405de4d8688d96dd05157c28db3ade5c9bc234kz }
60405de4d8688d96dd05157c28db3ade5c9bc234kz bzero(priv, sizeof (*priv));
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->uid = crgetuid(credp);
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->pid = pid;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->refs = 1;
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->minor = 5; /* just for hack */
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->ioctl_count = 0;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz /* for compatibility root is always authenticated */
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->authenticated = DRM_SUSER(credp);
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (dev->open) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz retcode = dev->open(dev, priv);
60405de4d8688d96dd05157c28db3ade5c9bc234kz if (retcode != 0) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz drm_free(priv, sizeof (*priv), DRM_MEM_FILES);
60405de4d8688d96dd05157c28db3ade5c9bc234kz DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (retcode);
60405de4d8688d96dd05157c28db3ade5c9bc234kz }
60405de4d8688d96dd05157c28db3ade5c9bc234kz }
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz /* first opener automatically becomes master */
60405de4d8688d96dd05157c28db3ade5c9bc234kz priv->master = TAILQ_EMPTY(&dev->files);
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz TAILQ_INSERT_TAIL(&dev->files, priv, link);
60405de4d8688d96dd05157c28db3ade5c9bc234kz }
60405de4d8688d96dd05157c28db3ade5c9bc234kz DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz return (0);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}