Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 2 | * \file drm_fops.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * File operations for DRM |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 4 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| 6 | * \author Daryll Strauss <daryll@valinux.com> |
| 7 | * \author Gareth Hughes <gareth@valinux.com> |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com |
| 12 | * |
| 13 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
| 14 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| 15 | * All Rights Reserved. |
| 16 | * |
| 17 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 18 | * copy of this software and associated documentation files (the "Software"), |
| 19 | * to deal in the Software without restriction, including without limitation |
| 20 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 21 | * and/or sell copies of the Software, and to permit persons to whom the |
| 22 | * Software is furnished to do so, subject to the following conditions: |
| 23 | * |
| 24 | * The above copyright notice and this permission notice (including the next |
| 25 | * paragraph) shall be included in all copies or substantial portions of the |
| 26 | * Software. |
| 27 | * |
| 28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 31 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 32 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 33 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 34 | * OTHER DEALINGS IN THE SOFTWARE. |
| 35 | */ |
| 36 | |
| 37 | #include "drmP.h" |
| 38 | #include <linux/poll.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
Paul Gortmaker | e0cd360 | 2011-08-30 11:04:30 -0400 | [diff] [blame] | 40 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 42 | /* from BKL pushdown: note that nothing else serializes idr_find() */ |
| 43 | DEFINE_MUTEX(drm_global_mutex); |
Ben Skeggs | e3461a2 | 2010-08-26 14:58:57 +1000 | [diff] [blame] | 44 | EXPORT_SYMBOL(drm_global_mutex); |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 45 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 46 | static int drm_open_helper(struct inode *inode, struct file *filp, |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 47 | struct drm_device * dev); |
Dave Airlie | c94f702 | 2005-07-07 21:03:38 +1000 | [diff] [blame] | 48 | |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 49 | static int drm_setup(struct drm_device * dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
| 51 | int i; |
| 52 | int ret; |
| 53 | |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 54 | if (dev->driver->firstopen) { |
| 55 | ret = dev->driver->firstopen(dev); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 56 | if (ret != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | return ret; |
| 58 | } |
| 59 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 60 | atomic_set(&dev->ioctl_count, 0); |
| 61 | atomic_set(&dev->vma_count, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 63 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
| 64 | !drm_core_check_feature(dev, DRIVER_MODESET)) { |
| 65 | dev->buf_use = 0; |
| 66 | atomic_set(&dev->buf_alloc, 0); |
| 67 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 68 | i = drm_dma_setup(dev); |
| 69 | if (i < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | return i; |
| 71 | } |
| 72 | |
Dave Airlie | 3d77461 | 2006-08-07 20:07:43 +1000 | [diff] [blame] | 73 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 74 | atomic_set(&dev->counts[i], 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Dave Airlie | 11d9c2f | 2007-02-18 17:13:39 +1100 | [diff] [blame] | 76 | dev->sigdata.lock = NULL; |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | dev->queue_count = 0; |
| 79 | dev->queue_reserved = 0; |
| 80 | dev->queue_slots = 0; |
| 81 | dev->queuelist = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | dev->context_flag = 0; |
| 83 | dev->interrupt_flag = 0; |
| 84 | dev->dma_flag = 0; |
| 85 | dev->last_context = 0; |
| 86 | dev->last_switch = 0; |
| 87 | dev->last_checked = 0; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 88 | init_waitqueue_head(&dev->context_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | dev->if_version = 0; |
| 90 | |
| 91 | dev->ctx_start = 0; |
| 92 | dev->lck_start = 0; |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | dev->buf_async = NULL; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 95 | init_waitqueue_head(&dev->buf_readers); |
| 96 | init_waitqueue_head(&dev->buf_writers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 98 | DRM_DEBUG("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | /* |
| 101 | * The kernel's context could be created here, but is now created |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 102 | * in drm_dma_enqueue. This is more resource-efficient for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | * hardware that does not do DMA, but may mean that |
| 104 | * drm_select_queue fails between the time the interrupt is |
| 105 | * initialized and the time the queues are initialized. |
| 106 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Open file. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 113 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | * \param inode device inode |
| 115 | * \param filp file pointer. |
| 116 | * \return zero on success or a negative number on failure. |
| 117 | * |
| 118 | * Searches the DRM device with the same minor number, calls open_helper(), and |
| 119 | * increments the device open count. If the open count was previous at zero, |
| 120 | * i.e., it's the first that the device is open, then calls setup(). |
| 121 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 122 | int drm_open(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 124 | struct drm_device *dev = NULL; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 125 | int minor_id = iminor(inode); |
| 126 | struct drm_minor *minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | int retcode = 0; |
| 128 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 129 | minor = idr_find(&drm_minors_idr, minor_id); |
| 130 | if (!minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | return -ENODEV; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 132 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 133 | if (!(dev = minor->dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | return -ENODEV; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 135 | |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 136 | if (drm_device_is_unplugged(dev)) |
| 137 | return -ENODEV; |
| 138 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 139 | retcode = drm_open_helper(inode, filp, dev); |
| 140 | if (!retcode) { |
| 141 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); |
Chris Wilson | 1a72d65 | 2010-08-11 14:41:16 +0100 | [diff] [blame] | 142 | if (!dev->open_count++) |
Jesse Barnes | a2c0a97 | 2008-11-05 10:31:53 -0800 | [diff] [blame] | 143 | retcode = drm_setup(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
Chris Wilson | da58405 | 2010-03-18 11:56:54 +0000 | [diff] [blame] | 145 | if (!retcode) { |
| 146 | mutex_lock(&dev->struct_mutex); |
| 147 | if (minor->type == DRM_MINOR_LEGACY) { |
| 148 | if (dev->dev_mapping == NULL) |
| 149 | dev->dev_mapping = inode->i_mapping; |
| 150 | else if (dev->dev_mapping != inode->i_mapping) |
| 151 | retcode = -ENODEV; |
| 152 | } |
| 153 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 154 | } |
Jesse Barnes | a2c0a97 | 2008-11-05 10:31:53 -0800 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | return retcode; |
| 157 | } |
| 158 | EXPORT_SYMBOL(drm_open); |
| 159 | |
| 160 | /** |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 161 | * File \c open operation. |
| 162 | * |
| 163 | * \param inode device inode. |
| 164 | * \param filp file pointer. |
| 165 | * |
| 166 | * Puts the dev->fops corresponding to the device minor number into |
| 167 | * \p filp, call the \c open method, and restore the file operations. |
| 168 | */ |
| 169 | int drm_stub_open(struct inode *inode, struct file *filp) |
| 170 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 171 | struct drm_device *dev = NULL; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 172 | struct drm_minor *minor; |
| 173 | int minor_id = iminor(inode); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 174 | int err = -ENODEV; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 175 | const struct file_operations *old_fops; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 176 | |
| 177 | DRM_DEBUG("\n"); |
| 178 | |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 179 | mutex_lock(&drm_global_mutex); |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 180 | minor = idr_find(&drm_minors_idr, minor_id); |
| 181 | if (!minor) |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 182 | goto out; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 183 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 184 | if (!(dev = minor->dev)) |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 185 | goto out; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 186 | |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 187 | if (drm_device_is_unplugged(dev)) |
| 188 | goto out; |
| 189 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 190 | old_fops = filp->f_op; |
Arjan van de Ven | e08e96d | 2011-10-31 07:28:57 -0700 | [diff] [blame] | 191 | filp->f_op = fops_get(dev->driver->fops); |
Laurent Pinchart | f41ced8 | 2009-01-06 14:40:40 -0800 | [diff] [blame] | 192 | if (filp->f_op == NULL) { |
| 193 | filp->f_op = old_fops; |
| 194 | goto out; |
| 195 | } |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 196 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { |
| 197 | fops_put(filp->f_op); |
| 198 | filp->f_op = fops_get(old_fops); |
| 199 | } |
| 200 | fops_put(old_fops); |
| 201 | |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 202 | out: |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 203 | mutex_unlock(&drm_global_mutex); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 204 | return err; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Check whether DRI will run on this CPU. |
| 209 | * |
| 210 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. |
| 211 | */ |
| 212 | static int drm_cpu_valid(void) |
| 213 | { |
| 214 | #if defined(__i386__) |
| 215 | if (boot_cpu_data.x86 == 3) |
| 216 | return 0; /* No cmpxchg on a 386 */ |
| 217 | #endif |
| 218 | #if defined(__sparc__) && !defined(__sparc_v9__) |
| 219 | return 0; /* No cmpxchg before v9 sparc. */ |
| 220 | #endif |
| 221 | return 1; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Called whenever a process opens /dev/drm. |
| 226 | * |
| 227 | * \param inode device inode. |
| 228 | * \param filp file pointer. |
| 229 | * \param dev device. |
| 230 | * \return zero on success or a negative number on failure. |
| 231 | * |
| 232 | * Creates and initializes a drm_file structure for the file private data in \p |
| 233 | * filp and add it into the double linked list in \p dev. |
| 234 | */ |
| 235 | static int drm_open_helper(struct inode *inode, struct file *filp, |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 236 | struct drm_device * dev) |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 237 | { |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 238 | int minor_id = iminor(inode); |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 239 | struct drm_file *priv; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 240 | int ret; |
| 241 | |
| 242 | if (filp->f_flags & O_EXCL) |
| 243 | return -EBUSY; /* No exclusive opens */ |
| 244 | if (!drm_cpu_valid()) |
| 245 | return -EINVAL; |
Dave Airlie | 5bcf719 | 2010-12-07 09:20:40 +1000 | [diff] [blame] | 246 | if (dev->switch_power_state != DRM_SWITCH_POWER_ON) |
| 247 | return -EINVAL; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 248 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 249 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 250 | |
Julia Lawall | 6ebc22e | 2010-05-13 21:58:56 +0200 | [diff] [blame] | 251 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 252 | if (!priv) |
| 253 | return -ENOMEM; |
| 254 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 255 | filp->private_data = priv; |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 256 | priv->filp = filp; |
David Howells | 2df68b4 | 2008-09-02 11:03:14 +1000 | [diff] [blame] | 257 | priv->uid = current_euid(); |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 258 | priv->pid = task_pid_nr(current); |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 259 | priv->minor = idr_find(&drm_minors_idr, minor_id); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 260 | priv->ioctl_count = 0; |
| 261 | /* for compatibility root is always authenticated */ |
| 262 | priv->authenticated = capable(CAP_SYS_ADMIN); |
| 263 | priv->lock_count = 0; |
| 264 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 265 | INIT_LIST_HEAD(&priv->lhead); |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 266 | INIT_LIST_HEAD(&priv->fbs); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 267 | INIT_LIST_HEAD(&priv->event_list); |
| 268 | init_waitqueue_head(&priv->event_wait); |
| 269 | priv->event_space = 4096; /* set aside 4k for event buffer */ |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 270 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 271 | if (dev->driver->driver_features & DRIVER_GEM) |
| 272 | drm_gem_open(dev, priv); |
| 273 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 274 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 275 | drm_prime_init_file_private(&priv->prime); |
| 276 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 277 | if (dev->driver->open) { |
| 278 | ret = dev->driver->open(dev, priv); |
| 279 | if (ret < 0) |
| 280 | goto out_free; |
| 281 | } |
| 282 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 283 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 284 | /* if there is no current master make this fd it */ |
| 285 | mutex_lock(&dev->struct_mutex); |
| 286 | if (!priv->minor->master) { |
| 287 | /* create a new master */ |
| 288 | priv->minor->master = drm_master_create(priv->minor); |
| 289 | if (!priv->minor->master) { |
Dan Carpenter | dba5ed0 | 2009-03-27 13:34:28 +0300 | [diff] [blame] | 290 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 291 | ret = -ENOMEM; |
| 292 | goto out_free; |
| 293 | } |
| 294 | |
| 295 | priv->is_master = 1; |
| 296 | /* take another reference for the copy in the local file priv */ |
| 297 | priv->master = drm_master_get(priv->minor->master); |
| 298 | |
| 299 | priv->authenticated = 1; |
| 300 | |
| 301 | mutex_unlock(&dev->struct_mutex); |
| 302 | if (dev->driver->master_create) { |
| 303 | ret = dev->driver->master_create(dev, priv->master); |
| 304 | if (ret) { |
| 305 | mutex_lock(&dev->struct_mutex); |
| 306 | /* drop both references if this fails */ |
| 307 | drm_master_put(&priv->minor->master); |
| 308 | drm_master_put(&priv->master); |
| 309 | mutex_unlock(&dev->struct_mutex); |
| 310 | goto out_free; |
| 311 | } |
| 312 | } |
Thomas Hellstrom | 862302f | 2009-12-02 18:15:25 +0000 | [diff] [blame] | 313 | mutex_lock(&dev->struct_mutex); |
| 314 | if (dev->driver->master_set) { |
| 315 | ret = dev->driver->master_set(dev, priv, true); |
| 316 | if (ret) { |
| 317 | /* drop both references if this fails */ |
| 318 | drm_master_put(&priv->minor->master); |
| 319 | drm_master_put(&priv->master); |
| 320 | mutex_unlock(&dev->struct_mutex); |
| 321 | goto out_free; |
| 322 | } |
| 323 | } |
| 324 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 325 | } else { |
| 326 | /* get a reference to the master */ |
| 327 | priv->master = drm_master_get(priv->minor->master); |
| 328 | mutex_unlock(&dev->struct_mutex); |
| 329 | } |
| 330 | |
| 331 | mutex_lock(&dev->struct_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 332 | list_add(&priv->lhead, &dev->filelist); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 333 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 334 | |
| 335 | #ifdef __alpha__ |
| 336 | /* |
| 337 | * Default the hose |
| 338 | */ |
| 339 | if (!dev->hose) { |
| 340 | struct pci_dev *pci_dev; |
| 341 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); |
| 342 | if (pci_dev) { |
| 343 | dev->hose = pci_dev->sysdata; |
| 344 | pci_dev_put(pci_dev); |
| 345 | } |
| 346 | if (!dev->hose) { |
| 347 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); |
| 348 | if (b) |
| 349 | dev->hose = b->sysdata; |
| 350 | } |
| 351 | } |
| 352 | #endif |
| 353 | |
| 354 | return 0; |
| 355 | out_free: |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 356 | kfree(priv); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 357 | filp->private_data = NULL; |
| 358 | return ret; |
| 359 | } |
| 360 | |
| 361 | /** No-op. */ |
| 362 | int drm_fasync(int fd, struct file *filp, int on) |
| 363 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 364 | struct drm_file *priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 365 | struct drm_device *dev = priv->minor->dev; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 366 | |
| 367 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 368 | (long)old_encode_dev(priv->minor->device)); |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 369 | return fasync_helper(fd, filp, on, &dev->buf_async); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 370 | } |
| 371 | EXPORT_SYMBOL(drm_fasync); |
| 372 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 373 | /* |
| 374 | * Reclaim locked buffers; note that this may be a bad idea if the current |
| 375 | * context doesn't have the hw lock... |
| 376 | */ |
| 377 | static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f) |
| 378 | { |
| 379 | struct drm_file *file_priv = f->private_data; |
| 380 | |
| 381 | if (drm_i_have_hw_lock(dev, file_priv)) { |
| 382 | dev->driver->reclaim_buffers_locked(dev, file_priv); |
| 383 | } else { |
| 384 | unsigned long _end = jiffies + 3 * DRM_HZ; |
| 385 | int locked = 0; |
| 386 | |
| 387 | drm_idlelock_take(&file_priv->master->lock); |
| 388 | |
| 389 | /* |
| 390 | * Wait for a while. |
| 391 | */ |
| 392 | do { |
| 393 | spin_lock_bh(&file_priv->master->lock.spinlock); |
| 394 | locked = file_priv->master->lock.idle_has_lock; |
| 395 | spin_unlock_bh(&file_priv->master->lock.spinlock); |
| 396 | if (locked) |
| 397 | break; |
| 398 | schedule(); |
| 399 | } while (!time_after_eq(jiffies, _end)); |
| 400 | |
| 401 | if (!locked) { |
| 402 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" |
| 403 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" |
| 404 | "\tI will go on reclaiming the buffers anyway.\n"); |
| 405 | } |
| 406 | |
| 407 | dev->driver->reclaim_buffers_locked(dev, file_priv); |
| 408 | drm_idlelock_release(&file_priv->master->lock); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | static void drm_master_release(struct drm_device *dev, struct file *filp) |
| 413 | { |
| 414 | struct drm_file *file_priv = filp->private_data; |
| 415 | |
| 416 | if (dev->driver->reclaim_buffers_locked && |
| 417 | file_priv->master->lock.hw_lock) |
| 418 | drm_reclaim_locked_buffers(dev, filp); |
| 419 | |
| 420 | if (dev->driver->reclaim_buffers_idlelocked && |
| 421 | file_priv->master->lock.hw_lock) { |
| 422 | drm_idlelock_take(&file_priv->master->lock); |
| 423 | dev->driver->reclaim_buffers_idlelocked(dev, file_priv); |
| 424 | drm_idlelock_release(&file_priv->master->lock); |
| 425 | } |
| 426 | |
| 427 | |
| 428 | if (drm_i_have_hw_lock(dev, file_priv)) { |
| 429 | DRM_DEBUG("File %p released, freeing lock for context %d\n", |
| 430 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); |
| 431 | drm_lock_free(&file_priv->master->lock, |
| 432 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); |
| 433 | } |
| 434 | |
| 435 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
| 436 | !dev->driver->reclaim_buffers_locked) { |
| 437 | dev->driver->reclaim_buffers(dev, file_priv); |
| 438 | } |
| 439 | } |
| 440 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 441 | static void drm_events_release(struct drm_file *file_priv) |
| 442 | { |
| 443 | struct drm_device *dev = file_priv->minor->dev; |
| 444 | struct drm_pending_event *e, *et; |
| 445 | struct drm_pending_vblank_event *v, *vt; |
| 446 | unsigned long flags; |
| 447 | |
| 448 | spin_lock_irqsave(&dev->event_lock, flags); |
| 449 | |
| 450 | /* Remove pending flips */ |
| 451 | list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) |
| 452 | if (v->base.file_priv == file_priv) { |
| 453 | list_del(&v->base.link); |
| 454 | drm_vblank_put(dev, v->pipe); |
| 455 | v->base.destroy(&v->base); |
| 456 | } |
| 457 | |
| 458 | /* Remove unconsumed events */ |
| 459 | list_for_each_entry_safe(e, et, &file_priv->event_list, link) |
| 460 | e->destroy(e); |
| 461 | |
| 462 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 463 | } |
| 464 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 465 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | * Release file. |
| 467 | * |
| 468 | * \param inode device inode |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 469 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | * \return zero on success or a negative number on failure. |
| 471 | * |
| 472 | * If the hardware lock is held then free it, and take it again for the kernel |
| 473 | * context since it's necessary to reclaim buffers. Unlink the file private |
| 474 | * data from its list and free it. Decreases the open count and if it reaches |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 475 | * zero calls drm_lastclose(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 477 | int drm_release(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | { |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 479 | struct drm_file *file_priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 480 | struct drm_device *dev = file_priv->minor->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | int retcode = 0; |
| 482 | |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 483 | mutex_lock(&drm_global_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 485 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 487 | if (dev->driver->preclose) |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 488 | dev->driver->preclose(dev, file_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* ======================================================== |
| 491 | * Begin inline drm_release |
| 492 | */ |
| 493 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 494 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 495 | task_pid_nr(current), |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 496 | (long)old_encode_dev(file_priv->minor->device), |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 497 | dev->open_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Thomas Hellstrom | 598781d | 2012-01-24 18:54:21 +0100 | [diff] [blame] | 499 | /* Release any auth tokens that might point to this file_priv, |
| 500 | (do that under the drm_global_mutex) */ |
| 501 | if (file_priv->magic) |
| 502 | (void) drm_remove_magic(file_priv->master, file_priv->magic); |
| 503 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 504 | /* if the master has gone away we can't do anything with the lock */ |
| 505 | if (file_priv->minor->master) |
| 506 | drm_master_release(dev, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 508 | drm_events_release(file_priv); |
| 509 | |
Kristian Høgsberg | ea39f83 | 2009-02-12 14:37:56 -0500 | [diff] [blame] | 510 | if (dev->driver->driver_features & DRIVER_MODESET) |
| 511 | drm_fb_release(file_priv); |
| 512 | |
Prathyush | 4e47e02 | 2012-04-14 17:22:13 +0530 | [diff] [blame] | 513 | if (dev->driver->driver_features & DRIVER_GEM) |
| 514 | drm_gem_release(dev, file_priv); |
| 515 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 516 | mutex_lock(&dev->ctxlist_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 517 | if (!list_empty(&dev->ctxlist)) { |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 518 | struct drm_ctx_list *pos, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 520 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 521 | if (pos->tag == file_priv && |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 522 | pos->handle != DRM_KERNEL_CONTEXT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | if (dev->driver->context_dtor) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 524 | dev->driver->context_dtor(dev, |
| 525 | pos->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 527 | drm_ctxbitmap_free(dev, pos->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 529 | list_del(&pos->head); |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 530 | kfree(pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | --dev->ctx_count; |
| 532 | } |
| 533 | } |
| 534 | } |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 535 | mutex_unlock(&dev->ctxlist_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 537 | mutex_lock(&dev->struct_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 538 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 539 | if (file_priv->is_master) { |
Thomas Hellstrom | fda714c | 2009-03-02 11:10:56 +0100 | [diff] [blame] | 540 | struct drm_master *master = file_priv->master; |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 541 | struct drm_file *temp; |
| 542 | list_for_each_entry(temp, &dev->filelist, lhead) { |
| 543 | if ((temp->master == file_priv->master) && |
| 544 | (temp != file_priv)) |
| 545 | temp->authenticated = 0; |
| 546 | } |
| 547 | |
Thomas Hellstrom | fda714c | 2009-03-02 11:10:56 +0100 | [diff] [blame] | 548 | /** |
| 549 | * Since the master is disappearing, so is the |
| 550 | * possibility to lock. |
| 551 | */ |
| 552 | |
| 553 | if (master->lock.hw_lock) { |
| 554 | if (dev->sigdata.lock == master->lock.hw_lock) |
| 555 | dev->sigdata.lock = NULL; |
| 556 | master->lock.hw_lock = NULL; |
| 557 | master->lock.file_priv = NULL; |
| 558 | wake_up_interruptible_all(&master->lock.lock_queue); |
| 559 | } |
| 560 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 561 | if (file_priv->minor->master == file_priv->master) { |
| 562 | /* drop the reference held my the minor */ |
Thomas Hellstrom | 862302f | 2009-12-02 18:15:25 +0000 | [diff] [blame] | 563 | if (dev->driver->master_drop) |
| 564 | dev->driver->master_drop(dev, file_priv, true); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 565 | drm_master_put(&file_priv->minor->master); |
| 566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 568 | |
| 569 | /* drop the reference held my the file priv */ |
| 570 | drm_master_put(&file_priv->master); |
| 571 | file_priv->is_master = 0; |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 572 | list_del(&file_priv->lhead); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 573 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 574 | |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 575 | if (dev->driver->postclose) |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 576 | dev->driver->postclose(dev, file_priv); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 577 | |
| 578 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 579 | drm_prime_destroy_file_private(&file_priv->prime); |
| 580 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 581 | kfree(file_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | /* ======================================================== |
| 584 | * End inline drm_release |
| 585 | */ |
| 586 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 587 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 588 | if (!--dev->open_count) { |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 589 | if (atomic_read(&dev->ioctl_count)) { |
| 590 | DRM_ERROR("Device busy: %d\n", |
| 591 | atomic_read(&dev->ioctl_count)); |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 592 | retcode = -EBUSY; |
Chris Wilson | 1a72d65 | 2010-08-11 14:41:16 +0100 | [diff] [blame] | 593 | } else |
| 594 | retcode = drm_lastclose(dev); |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 595 | if (drm_device_is_unplugged(dev)) |
| 596 | drm_put_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 598 | mutex_unlock(&drm_global_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | return retcode; |
| 601 | } |
| 602 | EXPORT_SYMBOL(drm_release); |
| 603 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 604 | static bool |
| 605 | drm_dequeue_event(struct drm_file *file_priv, |
| 606 | size_t total, size_t max, struct drm_pending_event **out) |
| 607 | { |
| 608 | struct drm_device *dev = file_priv->minor->dev; |
| 609 | struct drm_pending_event *e; |
| 610 | unsigned long flags; |
| 611 | bool ret = false; |
| 612 | |
| 613 | spin_lock_irqsave(&dev->event_lock, flags); |
| 614 | |
| 615 | *out = NULL; |
| 616 | if (list_empty(&file_priv->event_list)) |
| 617 | goto out; |
| 618 | e = list_first_entry(&file_priv->event_list, |
| 619 | struct drm_pending_event, link); |
| 620 | if (e->event->length + total > max) |
| 621 | goto out; |
| 622 | |
| 623 | file_priv->event_space += e->event->length; |
| 624 | list_del(&e->link); |
| 625 | *out = e; |
| 626 | ret = true; |
| 627 | |
| 628 | out: |
| 629 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 630 | return ret; |
| 631 | } |
| 632 | |
| 633 | ssize_t drm_read(struct file *filp, char __user *buffer, |
| 634 | size_t count, loff_t *offset) |
| 635 | { |
| 636 | struct drm_file *file_priv = filp->private_data; |
| 637 | struct drm_pending_event *e; |
| 638 | size_t total; |
| 639 | ssize_t ret; |
| 640 | |
| 641 | ret = wait_event_interruptible(file_priv->event_wait, |
| 642 | !list_empty(&file_priv->event_list)); |
| 643 | if (ret < 0) |
| 644 | return ret; |
| 645 | |
| 646 | total = 0; |
| 647 | while (drm_dequeue_event(file_priv, total, count, &e)) { |
| 648 | if (copy_to_user(buffer + total, |
| 649 | e->event, e->event->length)) { |
| 650 | total = -EFAULT; |
| 651 | break; |
| 652 | } |
| 653 | |
| 654 | total += e->event->length; |
| 655 | e->destroy(e); |
| 656 | } |
| 657 | |
| 658 | return total; |
| 659 | } |
| 660 | EXPORT_SYMBOL(drm_read); |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) |
| 663 | { |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 664 | struct drm_file *file_priv = filp->private_data; |
| 665 | unsigned int mask = 0; |
| 666 | |
| 667 | poll_wait(filp, &file_priv->event_wait, wait); |
| 668 | |
| 669 | if (!list_empty(&file_priv->event_list)) |
| 670 | mask |= POLLIN | POLLRDNORM; |
| 671 | |
| 672 | return mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 674 | EXPORT_SYMBOL(drm_poll); |