| 1 | /* $NetBSD: drm_fops.c,v 1.4 2014/07/16 20:56:25 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2013 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: drm_fops.c,v 1.4 2014/07/16 20:56:25 riastradh Exp $" ); |
| 34 | |
| 35 | #include <sys/param.h> |
| 36 | #include <sys/select.h> |
| 37 | |
| 38 | #include <drm/drmP.h> |
| 39 | |
| 40 | static int drm_open_file_master(struct drm_file *); |
| 41 | |
| 42 | static void drm_master_release(struct drm_file *); |
| 43 | static void drm_events_release(struct drm_file *); |
| 44 | static void drm_close_file_contexts(struct drm_file *); |
| 45 | static void drm_close_file_master(struct drm_file *); |
| 46 | |
| 47 | int |
| 48 | drm_open_file(struct drm_file *file, void *fp, struct drm_minor *minor) |
| 49 | { |
| 50 | struct drm_device *const dev = minor->dev; |
| 51 | int ret; |
| 52 | |
| 53 | file->always_authenticated = DRM_SUSER(); /* XXX */ |
| 54 | file->always_authenticated = file->always_authenticated; |
| 55 | file->is_master = false; |
| 56 | file->stereo_allowed = false; |
| 57 | file->universal_planes = false; |
| 58 | file->magic = 0; |
| 59 | INIT_LIST_HEAD(&file->lhead); |
| 60 | file->minor = minor; |
| 61 | file->lock_count = 0; |
| 62 | /* file->object_idr is initialized by drm_gem_open. */ |
| 63 | /* file->table_lock is initialized by drm_gem_open. */ |
| 64 | file->filp = fp; |
| 65 | file->driver_priv = NULL; |
| 66 | file->master = NULL; |
| 67 | INIT_LIST_HEAD(&file->fbs); |
| 68 | linux_mutex_init(&file->fbs_lock); |
| 69 | DRM_INIT_WAITQUEUE(&file->event_wait, "drmevent" ); |
| 70 | selinit(&file->event_selq); |
| 71 | INIT_LIST_HEAD(&file->event_list); |
| 72 | file->event_space = 0x1000; /* XXX cargo-culted from Linux */ |
| 73 | |
| 74 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
| 75 | drm_gem_open(dev, file); |
| 76 | #ifndef __NetBSD__ /* XXX drm prime */ |
| 77 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 78 | drm_prime_init_file_private(&file->prime); |
| 79 | #endif |
| 80 | |
| 81 | if (dev->driver->open) { |
| 82 | ret = (*dev->driver->open)(dev, file); |
| 83 | if (ret) |
| 84 | goto fail0; |
| 85 | } |
| 86 | |
| 87 | ret = drm_open_file_master(file); |
| 88 | if (ret) |
| 89 | goto fail1; |
| 90 | |
| 91 | mutex_lock(&dev->struct_mutex); |
| 92 | list_add(&file->lhead, &dev->filelist); |
| 93 | mutex_unlock(&dev->struct_mutex); |
| 94 | |
| 95 | /* Success! */ |
| 96 | return 0; |
| 97 | |
| 98 | fail1: /* |
| 99 | * XXX This error branch needs scrutiny, but Linux's error |
| 100 | * branches are incomprehensible and look wronger. |
| 101 | */ |
| 102 | if (dev->driver->preclose) |
| 103 | (*dev->driver->preclose)(dev, file); |
| 104 | if (dev->driver->postclose) |
| 105 | (*dev->driver->postclose)(dev, file); |
| 106 | fail0: |
| 107 | #ifndef __NetBSD__ /* XXX drm prime */ |
| 108 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 109 | drm_prime_destroy_file_private(&file->prime); |
| 110 | #endif |
| 111 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
| 112 | drm_gem_release(dev, file); |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | static int |
| 117 | drm_open_file_master(struct drm_file *file) |
| 118 | { |
| 119 | struct drm_device *const dev = file->minor->dev; |
| 120 | int ret; |
| 121 | |
| 122 | mutex_lock(&dev->master_mutex); |
| 123 | if (file->minor->master != NULL) { |
| 124 | file->master = drm_master_get(file->minor->master); |
| 125 | } else { |
| 126 | file->minor->master = drm_master_create(file->minor); |
| 127 | if (file->minor->master == NULL) { |
| 128 | ret = -ENOMEM; |
| 129 | goto fail0; |
| 130 | } |
| 131 | |
| 132 | file->is_master = 1; |
| 133 | file->master = drm_master_get(file->minor->master); |
| 134 | file->authenticated = 1; |
| 135 | |
| 136 | if (dev->driver->master_create) { |
| 137 | ret = (*dev->driver->master_create)(dev, |
| 138 | file->minor->master); |
| 139 | if (ret) |
| 140 | goto fail1; |
| 141 | } |
| 142 | |
| 143 | if (dev->driver->master_set) { |
| 144 | ret = (*dev->driver->master_set)(dev, file, true); |
| 145 | if (ret) |
| 146 | goto fail1; |
| 147 | } |
| 148 | } |
| 149 | mutex_unlock(&dev->master_mutex); |
| 150 | |
| 151 | /* Success! */ |
| 152 | return 0; |
| 153 | |
| 154 | fail1: mutex_unlock(&dev->master_mutex); |
| 155 | /* drm_master_put handles calling master_destroy for us. */ |
| 156 | drm_master_put(&file->minor->master); |
| 157 | drm_master_put(&file->master); |
| 158 | fail0: KASSERT(ret); |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | void |
| 163 | drm_close_file(struct drm_file *file) |
| 164 | { |
| 165 | struct drm_minor *const minor = file->minor; |
| 166 | struct drm_device *const dev = minor->dev; |
| 167 | |
| 168 | if (dev->driver->preclose) |
| 169 | (*dev->driver->preclose)(dev, file); |
| 170 | |
| 171 | if (file->magic) |
| 172 | (void)drm_remove_magic(file->master, file->magic); |
| 173 | if (minor->master) |
| 174 | drm_master_release(file); |
| 175 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
| 176 | drm_core_reclaim_buffers(dev, file); |
| 177 | drm_events_release(file); |
| 178 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 179 | drm_fb_release(file); |
| 180 | if (drm_core_check_feature(dev, DRIVER_GEM)) |
| 181 | drm_gem_release(dev, file); |
| 182 | drm_close_file_contexts(file); |
| 183 | drm_close_file_master(file); |
| 184 | |
| 185 | mutex_lock(&dev->struct_mutex); |
| 186 | list_del(&file->lhead); |
| 187 | mutex_unlock(&dev->struct_mutex); |
| 188 | |
| 189 | if (dev->driver->postclose) |
| 190 | (*dev->driver->postclose)(dev, file); |
| 191 | #ifndef __NetBSD__ /* XXX drm prime */ |
| 192 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 193 | drm_prime_destroy_file_private(&file->prime); |
| 194 | #endif |
| 195 | |
| 196 | |
| 197 | seldestroy(&file->event_selq); |
| 198 | DRM_DESTROY_WAITQUEUE(&file->event_wait); |
| 199 | linux_mutex_destroy(&file->fbs_lock); |
| 200 | } |
| 201 | |
| 202 | static void |
| 203 | drm_master_release(struct drm_file *file) |
| 204 | { |
| 205 | |
| 206 | /* |
| 207 | * XXX I think this locking concept is wrong -- we need to hold |
| 208 | * file->master->lock.spinlock across the two calls to |
| 209 | * drm_i_have_hw_lock and drm_lock_free. |
| 210 | */ |
| 211 | if (drm_i_have_hw_lock(file->minor->dev, file)) |
| 212 | drm_lock_free(&file->master->lock, |
| 213 | _DRM_LOCKING_CONTEXT(file->master->lock.hw_lock->lock)); |
| 214 | } |
| 215 | |
| 216 | static void |
| 217 | drm_events_release(struct drm_file *file) |
| 218 | { |
| 219 | struct drm_device *const dev = file->minor->dev; |
| 220 | struct drm_pending_vblank_event *vblank, *vblank_next; |
| 221 | struct drm_pending_event *event, *event_next; |
| 222 | unsigned long flags; |
| 223 | |
| 224 | spin_lock_irqsave(&dev->event_lock, flags); |
| 225 | |
| 226 | list_for_each_entry_safe(vblank, vblank_next, &dev->vblank_event_list, |
| 227 | base.link) { |
| 228 | if (vblank->base.file_priv == file) { |
| 229 | list_del(&vblank->base.link); |
| 230 | drm_vblank_put(dev, vblank->pipe); |
| 231 | (*vblank->base.destroy)(&vblank->base); |
| 232 | } |
| 233 | } |
| 234 | list_for_each_entry_safe(event, event_next, &file->event_list, link) { |
| 235 | (*event->destroy)(event); |
| 236 | } |
| 237 | |
| 238 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 239 | } |
| 240 | |
| 241 | static void |
| 242 | drm_close_file_contexts(struct drm_file *file) |
| 243 | { |
| 244 | struct drm_device *const dev = file->minor->dev; |
| 245 | struct drm_ctx_list *node, *next; |
| 246 | |
| 247 | mutex_lock(&dev->ctxlist_mutex); |
| 248 | if (!list_empty(&dev->ctxlist)) { |
| 249 | list_for_each_entry_safe(node, next, &dev->ctxlist, head) { |
| 250 | if (node->tag != file) |
| 251 | continue; |
| 252 | if (node->handle == DRM_KERNEL_CONTEXT) |
| 253 | continue; |
| 254 | if (dev->driver->context_dtor) |
| 255 | (*dev->driver->context_dtor)(dev, |
| 256 | node->handle); |
| 257 | drm_ctxbitmap_free(dev, node->handle); |
| 258 | list_del(&node->head); |
| 259 | kfree(node); |
| 260 | } |
| 261 | } |
| 262 | mutex_unlock(&dev->ctxlist_mutex); |
| 263 | } |
| 264 | |
| 265 | static void |
| 266 | drm_close_file_master(struct drm_file *file) |
| 267 | { |
| 268 | struct drm_device *const dev = file->minor->dev; |
| 269 | |
| 270 | mutex_lock(&dev->master_mutex); |
| 271 | if (file->is_master) { |
| 272 | struct drm_file *other_file; |
| 273 | |
| 274 | list_for_each_entry(other_file, &dev->filelist, lhead) { |
| 275 | if (other_file == file) |
| 276 | continue; |
| 277 | if (other_file->master != file->master) |
| 278 | continue; |
| 279 | other_file->authenticated = 0; |
| 280 | } |
| 281 | if (file->minor->master == file->master) { |
| 282 | if (dev->driver->master_drop) |
| 283 | (*dev->driver->master_drop)(dev, file, true); |
| 284 | drm_master_put(&file->minor->master); |
| 285 | } |
| 286 | } |
| 287 | if (file->master != NULL) |
| 288 | drm_master_put(&file->master); |
| 289 | file->is_master = 0; |
| 290 | mutex_unlock(&dev->master_mutex); |
| 291 | } |
| 292 | |