1 /* 2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* BEGIN CSTYLED */ 7 8 /* drm_fops.h -- File operations for DRM -*- linux-c -*- 9 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com 10 */ 11 /*- 12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 * 35 * Authors: 36 * Rickard E. (Rik) Faith <faith@valinux.com> 37 * Daryll Strauss <daryll@valinux.com> 38 * Gareth Hughes <gareth@valinux.com> 39 * 40 */ 41 42 /* END CSTYLED */ 43 44 #pragma ident "%Z%%M% %I% %E% SMI" 45 46 #include "drmP.h" 47 48 /*ARGSUSED*/ 49 drm_file_t * 50 drm_find_file_by_proc(drm_device_t *dev, cred_t *p) 51 { 52 pid_t pid = ddi_get_pid(); 53 drm_file_t *priv; 54 55 TAILQ_FOREACH(priv, &dev->files, link) 56 if (priv->pid == pid) 57 return (priv); 58 return (NULL); 59 } 60 61 /* drm_open_helper is called whenever a process opens /dev/drm. */ 62 /*ARGSUSED*/ 63 int 64 drm_open_helper(drm_softstate_t *dev, int flags, int otyp, cred_t *credp) 65 { 66 drm_file_t *priv; 67 pid_t pid; 68 int retcode; 69 70 if (flags & FEXCL) 71 return (DRM_ERR(EBUSY)); /* No exclusive opens */ 72 dev->flags = flags; 73 74 pid = ddi_get_pid(); 75 DRM_DEBUG("drm_open_helper :pid = %d", pid); 76 77 DRM_LOCK(); 78 priv = drm_find_file_by_proc(dev, credp); 79 if (priv) { 80 priv->refs++; 81 } else { 82 priv = drm_alloc(sizeof (*priv), DRM_MEM_FILES); 83 if (priv == NULL) { 84 DRM_UNLOCK(); 85 return (DRM_ERR(ENOMEM)); 86 } 87 bzero(priv, sizeof (*priv)); 88 89 priv->uid = crgetuid(credp); 90 priv->pid = pid; 91 92 priv->refs = 1; 93 priv->minor = 5; /* just for hack */ 94 priv->ioctl_count = 0; 95 96 /* for compatibility root is always authenticated */ 97 priv->authenticated = DRM_SUSER(credp); 98 99 if (dev->open) { 100 retcode = dev->open(dev, priv); 101 if (retcode != 0) { 102 drm_free(priv, sizeof (*priv), DRM_MEM_FILES); 103 DRM_UNLOCK(); 104 return (retcode); 105 } 106 } 107 108 /* first opener automatically becomes master */ 109 priv->master = TAILQ_EMPTY(&dev->files); 110 111 TAILQ_INSERT_TAIL(&dev->files, priv, link); 112 } 113 DRM_UNLOCK(); 114 return (0); 115 } 116