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 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 37 | #include <drm/drmP.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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->context_flag = 0; |
| 79 | dev->interrupt_flag = 0; |
| 80 | dev->dma_flag = 0; |
| 81 | dev->last_context = 0; |
| 82 | dev->last_switch = 0; |
| 83 | dev->last_checked = 0; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 84 | init_waitqueue_head(&dev->context_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | dev->if_version = 0; |
| 86 | |
| 87 | dev->ctx_start = 0; |
| 88 | dev->lck_start = 0; |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | dev->buf_async = NULL; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 91 | init_waitqueue_head(&dev->buf_readers); |
| 92 | init_waitqueue_head(&dev->buf_writers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 94 | DRM_DEBUG("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | /* |
| 97 | * The kernel's context could be created here, but is now created |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 98 | * in drm_dma_enqueue. This is more resource-efficient for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | * hardware that does not do DMA, but may mean that |
| 100 | * drm_select_queue fails between the time the interrupt is |
| 101 | * initialized and the time the queues are initialized. |
| 102 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Open file. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 109 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | * \param inode device inode |
| 111 | * \param filp file pointer. |
| 112 | * \return zero on success or a negative number on failure. |
| 113 | * |
| 114 | * Searches the DRM device with the same minor number, calls open_helper(), and |
| 115 | * increments the device open count. If the open count was previous at zero, |
| 116 | * i.e., it's the first that the device is open, then calls setup(). |
| 117 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 118 | int drm_open(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 120 | struct drm_device *dev = NULL; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 121 | int minor_id = iminor(inode); |
| 122 | struct drm_minor *minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | int retcode = 0; |
Ilija Hadzic | fdb40a0 | 2012-10-29 17:35:01 +0000 | [diff] [blame] | 124 | int need_setup = 0; |
| 125 | struct address_space *old_mapping; |
Ilija Hadzic | a8ec3a6 | 2013-04-02 09:56:10 -0400 | [diff] [blame^] | 126 | struct address_space *old_imapping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 128 | minor = idr_find(&drm_minors_idr, minor_id); |
| 129 | if (!minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | return -ENODEV; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 131 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 132 | if (!(dev = minor->dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | return -ENODEV; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 134 | |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 135 | if (drm_device_is_unplugged(dev)) |
| 136 | return -ENODEV; |
| 137 | |
Ilija Hadzic | fdb40a0 | 2012-10-29 17:35:01 +0000 | [diff] [blame] | 138 | if (!dev->open_count++) |
| 139 | need_setup = 1; |
| 140 | mutex_lock(&dev->struct_mutex); |
Ilija Hadzic | a8ec3a6 | 2013-04-02 09:56:10 -0400 | [diff] [blame^] | 141 | old_imapping = inode->i_mapping; |
Ilija Hadzic | fdb40a0 | 2012-10-29 17:35:01 +0000 | [diff] [blame] | 142 | old_mapping = dev->dev_mapping; |
| 143 | if (old_mapping == NULL) |
| 144 | dev->dev_mapping = &inode->i_data; |
| 145 | /* ihold ensures nobody can remove inode with our i_data */ |
| 146 | ihold(container_of(dev->dev_mapping, struct inode, i_data)); |
| 147 | inode->i_mapping = dev->dev_mapping; |
| 148 | filp->f_mapping = dev->dev_mapping; |
| 149 | mutex_unlock(&dev->struct_mutex); |
Jesse Barnes | a2c0a97 | 2008-11-05 10:31:53 -0800 | [diff] [blame] | 150 | |
Ilija Hadzic | fdb40a0 | 2012-10-29 17:35:01 +0000 | [diff] [blame] | 151 | retcode = drm_open_helper(inode, filp, dev); |
| 152 | if (retcode) |
| 153 | goto err_undo; |
| 154 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); |
| 155 | if (need_setup) { |
| 156 | retcode = drm_setup(dev); |
| 157 | if (retcode) |
| 158 | goto err_undo; |
| 159 | } |
| 160 | return 0; |
| 161 | |
| 162 | err_undo: |
| 163 | mutex_lock(&dev->struct_mutex); |
Ilija Hadzic | a8ec3a6 | 2013-04-02 09:56:10 -0400 | [diff] [blame^] | 164 | filp->f_mapping = old_imapping; |
| 165 | inode->i_mapping = old_imapping; |
Ilija Hadzic | fdb40a0 | 2012-10-29 17:35:01 +0000 | [diff] [blame] | 166 | iput(container_of(dev->dev_mapping, struct inode, i_data)); |
| 167 | dev->dev_mapping = old_mapping; |
| 168 | mutex_unlock(&dev->struct_mutex); |
| 169 | dev->open_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return retcode; |
| 171 | } |
| 172 | EXPORT_SYMBOL(drm_open); |
| 173 | |
| 174 | /** |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 175 | * File \c open operation. |
| 176 | * |
| 177 | * \param inode device inode. |
| 178 | * \param filp file pointer. |
| 179 | * |
| 180 | * Puts the dev->fops corresponding to the device minor number into |
| 181 | * \p filp, call the \c open method, and restore the file operations. |
| 182 | */ |
| 183 | int drm_stub_open(struct inode *inode, struct file *filp) |
| 184 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 185 | struct drm_device *dev = NULL; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 186 | struct drm_minor *minor; |
| 187 | int minor_id = iminor(inode); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 188 | int err = -ENODEV; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 189 | const struct file_operations *old_fops; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 190 | |
| 191 | DRM_DEBUG("\n"); |
| 192 | |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 193 | mutex_lock(&drm_global_mutex); |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 194 | minor = idr_find(&drm_minors_idr, minor_id); |
| 195 | if (!minor) |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 196 | goto out; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 197 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 198 | if (!(dev = minor->dev)) |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 199 | goto out; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 200 | |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 201 | if (drm_device_is_unplugged(dev)) |
| 202 | goto out; |
| 203 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 204 | old_fops = filp->f_op; |
Arjan van de Ven | e08e96d | 2011-10-31 07:28:57 -0700 | [diff] [blame] | 205 | filp->f_op = fops_get(dev->driver->fops); |
Laurent Pinchart | f41ced8 | 2009-01-06 14:40:40 -0800 | [diff] [blame] | 206 | if (filp->f_op == NULL) { |
| 207 | filp->f_op = old_fops; |
| 208 | goto out; |
| 209 | } |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 210 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { |
| 211 | fops_put(filp->f_op); |
| 212 | filp->f_op = fops_get(old_fops); |
| 213 | } |
| 214 | fops_put(old_fops); |
| 215 | |
Jonathan Corbet | 70ffa16 | 2008-05-15 11:34:16 -0600 | [diff] [blame] | 216 | out: |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 217 | mutex_unlock(&drm_global_mutex); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 218 | return err; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Check whether DRI will run on this CPU. |
| 223 | * |
| 224 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. |
| 225 | */ |
| 226 | static int drm_cpu_valid(void) |
| 227 | { |
| 228 | #if defined(__i386__) |
| 229 | if (boot_cpu_data.x86 == 3) |
| 230 | return 0; /* No cmpxchg on a 386 */ |
| 231 | #endif |
| 232 | #if defined(__sparc__) && !defined(__sparc_v9__) |
| 233 | return 0; /* No cmpxchg before v9 sparc. */ |
| 234 | #endif |
| 235 | return 1; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Called whenever a process opens /dev/drm. |
| 240 | * |
| 241 | * \param inode device inode. |
| 242 | * \param filp file pointer. |
| 243 | * \param dev device. |
| 244 | * \return zero on success or a negative number on failure. |
| 245 | * |
| 246 | * Creates and initializes a drm_file structure for the file private data in \p |
| 247 | * filp and add it into the double linked list in \p dev. |
| 248 | */ |
| 249 | static int drm_open_helper(struct inode *inode, struct file *filp, |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 250 | struct drm_device * dev) |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 251 | { |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 252 | int minor_id = iminor(inode); |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 253 | struct drm_file *priv; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 254 | int ret; |
| 255 | |
| 256 | if (filp->f_flags & O_EXCL) |
| 257 | return -EBUSY; /* No exclusive opens */ |
| 258 | if (!drm_cpu_valid()) |
| 259 | return -EINVAL; |
Dave Airlie | 5bcf719 | 2010-12-07 09:20:40 +1000 | [diff] [blame] | 260 | if (dev->switch_power_state != DRM_SWITCH_POWER_ON) |
| 261 | return -EINVAL; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 262 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 263 | 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] | 264 | |
Julia Lawall | 6ebc22e | 2010-05-13 21:58:56 +0200 | [diff] [blame] | 265 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 266 | if (!priv) |
| 267 | return -ENOMEM; |
| 268 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 269 | filp->private_data = priv; |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 270 | priv->filp = filp; |
David Howells | 2df68b4 | 2008-09-02 11:03:14 +1000 | [diff] [blame] | 271 | priv->uid = current_euid(); |
Eric W. Biederman | 5fce5e0 | 2012-02-07 16:47:26 -0800 | [diff] [blame] | 272 | priv->pid = get_pid(task_pid(current)); |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 273 | priv->minor = idr_find(&drm_minors_idr, minor_id); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 274 | priv->ioctl_count = 0; |
| 275 | /* for compatibility root is always authenticated */ |
| 276 | priv->authenticated = capable(CAP_SYS_ADMIN); |
| 277 | priv->lock_count = 0; |
| 278 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 279 | INIT_LIST_HEAD(&priv->lhead); |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 280 | INIT_LIST_HEAD(&priv->fbs); |
Daniel Vetter | 4b096ac | 2012-12-10 21:19:18 +0100 | [diff] [blame] | 281 | mutex_init(&priv->fbs_lock); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 282 | INIT_LIST_HEAD(&priv->event_list); |
| 283 | init_waitqueue_head(&priv->event_wait); |
| 284 | priv->event_space = 4096; /* set aside 4k for event buffer */ |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 285 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 286 | if (dev->driver->driver_features & DRIVER_GEM) |
| 287 | drm_gem_open(dev, priv); |
| 288 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 289 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 290 | drm_prime_init_file_private(&priv->prime); |
| 291 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 292 | if (dev->driver->open) { |
| 293 | ret = dev->driver->open(dev, priv); |
| 294 | if (ret < 0) |
| 295 | goto out_free; |
| 296 | } |
| 297 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 298 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 299 | /* if there is no current master make this fd it */ |
| 300 | mutex_lock(&dev->struct_mutex); |
| 301 | if (!priv->minor->master) { |
| 302 | /* create a new master */ |
| 303 | priv->minor->master = drm_master_create(priv->minor); |
| 304 | if (!priv->minor->master) { |
Dan Carpenter | dba5ed0 | 2009-03-27 13:34:28 +0300 | [diff] [blame] | 305 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 306 | ret = -ENOMEM; |
| 307 | goto out_free; |
| 308 | } |
| 309 | |
| 310 | priv->is_master = 1; |
| 311 | /* take another reference for the copy in the local file priv */ |
| 312 | priv->master = drm_master_get(priv->minor->master); |
| 313 | |
| 314 | priv->authenticated = 1; |
| 315 | |
| 316 | mutex_unlock(&dev->struct_mutex); |
| 317 | if (dev->driver->master_create) { |
| 318 | ret = dev->driver->master_create(dev, priv->master); |
| 319 | if (ret) { |
| 320 | mutex_lock(&dev->struct_mutex); |
| 321 | /* drop both references if this fails */ |
| 322 | drm_master_put(&priv->minor->master); |
| 323 | drm_master_put(&priv->master); |
| 324 | mutex_unlock(&dev->struct_mutex); |
| 325 | goto out_free; |
| 326 | } |
| 327 | } |
Thomas Hellstrom | 862302f | 2009-12-02 18:15:25 +0000 | [diff] [blame] | 328 | mutex_lock(&dev->struct_mutex); |
| 329 | if (dev->driver->master_set) { |
| 330 | ret = dev->driver->master_set(dev, priv, true); |
| 331 | if (ret) { |
| 332 | /* drop both references if this fails */ |
| 333 | drm_master_put(&priv->minor->master); |
| 334 | drm_master_put(&priv->master); |
| 335 | mutex_unlock(&dev->struct_mutex); |
| 336 | goto out_free; |
| 337 | } |
| 338 | } |
| 339 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 340 | } else { |
| 341 | /* get a reference to the master */ |
| 342 | priv->master = drm_master_get(priv->minor->master); |
| 343 | mutex_unlock(&dev->struct_mutex); |
| 344 | } |
| 345 | |
| 346 | mutex_lock(&dev->struct_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 347 | list_add(&priv->lhead, &dev->filelist); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 348 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 349 | |
| 350 | #ifdef __alpha__ |
| 351 | /* |
| 352 | * Default the hose |
| 353 | */ |
| 354 | if (!dev->hose) { |
| 355 | struct pci_dev *pci_dev; |
| 356 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); |
| 357 | if (pci_dev) { |
| 358 | dev->hose = pci_dev->sysdata; |
| 359 | pci_dev_put(pci_dev); |
| 360 | } |
| 361 | if (!dev->hose) { |
| 362 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); |
| 363 | if (b) |
| 364 | dev->hose = b->sysdata; |
| 365 | } |
| 366 | } |
| 367 | #endif |
| 368 | |
| 369 | return 0; |
| 370 | out_free: |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 371 | kfree(priv); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 372 | filp->private_data = NULL; |
| 373 | return ret; |
| 374 | } |
| 375 | |
| 376 | /** No-op. */ |
| 377 | int drm_fasync(int fd, struct file *filp, int on) |
| 378 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 379 | struct drm_file *priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 380 | struct drm_device *dev = priv->minor->dev; |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 381 | |
| 382 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 383 | (long)old_encode_dev(priv->minor->device)); |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 384 | return fasync_helper(fd, filp, on, &dev->buf_async); |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 385 | } |
| 386 | EXPORT_SYMBOL(drm_fasync); |
| 387 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 388 | static void drm_master_release(struct drm_device *dev, struct file *filp) |
| 389 | { |
| 390 | struct drm_file *file_priv = filp->private_data; |
| 391 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 392 | if (drm_i_have_hw_lock(dev, file_priv)) { |
| 393 | DRM_DEBUG("File %p released, freeing lock for context %d\n", |
| 394 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); |
| 395 | drm_lock_free(&file_priv->master->lock, |
| 396 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); |
| 397 | } |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 398 | } |
| 399 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 400 | static void drm_events_release(struct drm_file *file_priv) |
| 401 | { |
| 402 | struct drm_device *dev = file_priv->minor->dev; |
| 403 | struct drm_pending_event *e, *et; |
| 404 | struct drm_pending_vblank_event *v, *vt; |
| 405 | unsigned long flags; |
| 406 | |
| 407 | spin_lock_irqsave(&dev->event_lock, flags); |
| 408 | |
| 409 | /* Remove pending flips */ |
| 410 | list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link) |
| 411 | if (v->base.file_priv == file_priv) { |
| 412 | list_del(&v->base.link); |
| 413 | drm_vblank_put(dev, v->pipe); |
| 414 | v->base.destroy(&v->base); |
| 415 | } |
| 416 | |
| 417 | /* Remove unconsumed events */ |
| 418 | list_for_each_entry_safe(e, et, &file_priv->event_list, link) |
| 419 | e->destroy(e); |
| 420 | |
| 421 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 422 | } |
| 423 | |
Dave Airlie | d985c10 | 2006-01-02 21:32:48 +1100 | [diff] [blame] | 424 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | * Release file. |
| 426 | * |
| 427 | * \param inode device inode |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 428 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | * \return zero on success or a negative number on failure. |
| 430 | * |
| 431 | * If the hardware lock is held then free it, and take it again for the kernel |
| 432 | * context since it's necessary to reclaim buffers. Unlink the file private |
| 433 | * 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] | 434 | * zero calls drm_lastclose(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 436 | int drm_release(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | { |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 438 | struct drm_file *file_priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 439 | struct drm_device *dev = file_priv->minor->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | int retcode = 0; |
| 441 | |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 442 | mutex_lock(&drm_global_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 444 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 446 | if (dev->driver->preclose) |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 447 | dev->driver->preclose(dev, file_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | /* ======================================================== |
| 450 | * Begin inline drm_release |
| 451 | */ |
| 452 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 453 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 454 | task_pid_nr(current), |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 455 | (long)old_encode_dev(file_priv->minor->device), |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 456 | dev->open_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Thomas Hellstrom | 598781d | 2012-01-24 18:54:21 +0100 | [diff] [blame] | 458 | /* Release any auth tokens that might point to this file_priv, |
| 459 | (do that under the drm_global_mutex) */ |
| 460 | if (file_priv->magic) |
| 461 | (void) drm_remove_magic(file_priv->master, file_priv->magic); |
| 462 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 463 | /* if the master has gone away we can't do anything with the lock */ |
| 464 | if (file_priv->minor->master) |
| 465 | drm_master_release(dev, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Daniel Vetter | 67cb4b4 | 2011-10-26 00:31:26 +0200 | [diff] [blame] | 467 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
| 468 | drm_core_reclaim_buffers(dev, file_priv); |
| 469 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 470 | drm_events_release(file_priv); |
| 471 | |
Kristian Høgsberg | ea39f83 | 2009-02-12 14:37:56 -0500 | [diff] [blame] | 472 | if (dev->driver->driver_features & DRIVER_MODESET) |
| 473 | drm_fb_release(file_priv); |
| 474 | |
Prathyush | 4e47e02 | 2012-04-14 17:22:13 +0530 | [diff] [blame] | 475 | if (dev->driver->driver_features & DRIVER_GEM) |
| 476 | drm_gem_release(dev, file_priv); |
| 477 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 478 | mutex_lock(&dev->ctxlist_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 479 | if (!list_empty(&dev->ctxlist)) { |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 480 | struct drm_ctx_list *pos, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 482 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 483 | if (pos->tag == file_priv && |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 484 | pos->handle != DRM_KERNEL_CONTEXT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | if (dev->driver->context_dtor) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 486 | dev->driver->context_dtor(dev, |
| 487 | pos->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 489 | drm_ctxbitmap_free(dev, pos->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 491 | list_del(&pos->head); |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 492 | kfree(pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | --dev->ctx_count; |
| 494 | } |
| 495 | } |
| 496 | } |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 497 | mutex_unlock(&dev->ctxlist_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 499 | mutex_lock(&dev->struct_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 500 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 501 | if (file_priv->is_master) { |
Thomas Hellstrom | fda714c | 2009-03-02 11:10:56 +0100 | [diff] [blame] | 502 | struct drm_master *master = file_priv->master; |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 503 | struct drm_file *temp; |
| 504 | list_for_each_entry(temp, &dev->filelist, lhead) { |
| 505 | if ((temp->master == file_priv->master) && |
| 506 | (temp != file_priv)) |
| 507 | temp->authenticated = 0; |
| 508 | } |
| 509 | |
Thomas Hellstrom | fda714c | 2009-03-02 11:10:56 +0100 | [diff] [blame] | 510 | /** |
| 511 | * Since the master is disappearing, so is the |
| 512 | * possibility to lock. |
| 513 | */ |
| 514 | |
| 515 | if (master->lock.hw_lock) { |
| 516 | if (dev->sigdata.lock == master->lock.hw_lock) |
| 517 | dev->sigdata.lock = NULL; |
| 518 | master->lock.hw_lock = NULL; |
| 519 | master->lock.file_priv = NULL; |
| 520 | wake_up_interruptible_all(&master->lock.lock_queue); |
| 521 | } |
| 522 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 523 | if (file_priv->minor->master == file_priv->master) { |
| 524 | /* drop the reference held my the minor */ |
Thomas Hellstrom | 862302f | 2009-12-02 18:15:25 +0000 | [diff] [blame] | 525 | if (dev->driver->master_drop) |
| 526 | dev->driver->master_drop(dev, file_priv, true); |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 527 | drm_master_put(&file_priv->minor->master); |
| 528 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 530 | |
Ilija Hadzic | 949c4a3 | 2012-05-15 16:40:10 -0400 | [diff] [blame] | 531 | BUG_ON(dev->dev_mapping == NULL); |
| 532 | iput(container_of(dev->dev_mapping, struct inode, i_data)); |
| 533 | |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 534 | /* drop the reference held my the file priv */ |
| 535 | drm_master_put(&file_priv->master); |
| 536 | file_priv->is_master = 0; |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 537 | list_del(&file_priv->lhead); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 538 | mutex_unlock(&dev->struct_mutex); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 539 | |
Dave Airlie | 22eae94 | 2005-11-10 22:16:34 +1100 | [diff] [blame] | 540 | if (dev->driver->postclose) |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 541 | dev->driver->postclose(dev, file_priv); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 542 | |
| 543 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| 544 | drm_prime_destroy_file_private(&file_priv->prime); |
| 545 | |
Eric W. Biederman | 5fce5e0 | 2012-02-07 16:47:26 -0800 | [diff] [blame] | 546 | put_pid(file_priv->pid); |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 547 | kfree(file_priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* ======================================================== |
| 550 | * End inline drm_release |
| 551 | */ |
| 552 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 553 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 554 | if (!--dev->open_count) { |
Dave Airlie | 7c1c287 | 2008-11-28 14:22:24 +1000 | [diff] [blame] | 555 | if (atomic_read(&dev->ioctl_count)) { |
| 556 | DRM_ERROR("Device busy: %d\n", |
| 557 | atomic_read(&dev->ioctl_count)); |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 558 | retcode = -EBUSY; |
Chris Wilson | 1a72d65 | 2010-08-11 14:41:16 +0100 | [diff] [blame] | 559 | } else |
| 560 | retcode = drm_lastclose(dev); |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 561 | if (drm_device_is_unplugged(dev)) |
| 562 | drm_put_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
Arnd Bergmann | 5837471 | 2010-07-10 23:51:39 +0200 | [diff] [blame] | 564 | mutex_unlock(&drm_global_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
| 566 | return retcode; |
| 567 | } |
| 568 | EXPORT_SYMBOL(drm_release); |
| 569 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 570 | static bool |
| 571 | drm_dequeue_event(struct drm_file *file_priv, |
| 572 | size_t total, size_t max, struct drm_pending_event **out) |
| 573 | { |
| 574 | struct drm_device *dev = file_priv->minor->dev; |
| 575 | struct drm_pending_event *e; |
| 576 | unsigned long flags; |
| 577 | bool ret = false; |
| 578 | |
| 579 | spin_lock_irqsave(&dev->event_lock, flags); |
| 580 | |
| 581 | *out = NULL; |
| 582 | if (list_empty(&file_priv->event_list)) |
| 583 | goto out; |
| 584 | e = list_first_entry(&file_priv->event_list, |
| 585 | struct drm_pending_event, link); |
| 586 | if (e->event->length + total > max) |
| 587 | goto out; |
| 588 | |
| 589 | file_priv->event_space += e->event->length; |
| 590 | list_del(&e->link); |
| 591 | *out = e; |
| 592 | ret = true; |
| 593 | |
| 594 | out: |
| 595 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 596 | return ret; |
| 597 | } |
| 598 | |
| 599 | ssize_t drm_read(struct file *filp, char __user *buffer, |
| 600 | size_t count, loff_t *offset) |
| 601 | { |
| 602 | struct drm_file *file_priv = filp->private_data; |
| 603 | struct drm_pending_event *e; |
| 604 | size_t total; |
| 605 | ssize_t ret; |
| 606 | |
| 607 | ret = wait_event_interruptible(file_priv->event_wait, |
| 608 | !list_empty(&file_priv->event_list)); |
| 609 | if (ret < 0) |
| 610 | return ret; |
| 611 | |
| 612 | total = 0; |
| 613 | while (drm_dequeue_event(file_priv, total, count, &e)) { |
| 614 | if (copy_to_user(buffer + total, |
| 615 | e->event, e->event->length)) { |
| 616 | total = -EFAULT; |
| 617 | break; |
| 618 | } |
| 619 | |
| 620 | total += e->event->length; |
| 621 | e->destroy(e); |
| 622 | } |
| 623 | |
| 624 | return total; |
| 625 | } |
| 626 | EXPORT_SYMBOL(drm_read); |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) |
| 629 | { |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 630 | struct drm_file *file_priv = filp->private_data; |
| 631 | unsigned int mask = 0; |
| 632 | |
| 633 | poll_wait(filp, &file_priv->event_wait, wait); |
| 634 | |
| 635 | if (!list_empty(&file_priv->event_list)) |
| 636 | mask |= POLLIN | POLLRDNORM; |
| 637 | |
| 638 | return mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 640 | EXPORT_SYMBOL(drm_poll); |