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_irq.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * IRQ support |
| 4 | * |
| 5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| 6 | * \author Gareth Hughes <gareth@valinux.com> |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com |
| 11 | * |
| 12 | * Copyright 1999, 2000 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 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 36 | #include <drm/drmP.h> |
Jesse Barnes | ac2874b | 2010-07-01 16:47:31 -0700 | [diff] [blame] | 37 | #include "drm_trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #include <linux/interrupt.h> /* For task queue support */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Dave Airlie | 28d5204 | 2009-09-21 14:33:58 +1000 | [diff] [blame] | 42 | #include <linux/vgaarb.h> |
Paul Gortmaker | 2d1a8a4 | 2011-08-30 18:16:33 -0400 | [diff] [blame] | 43 | #include <linux/export.h> |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 44 | |
| 45 | /* Access macro for slots in vblank timestamp ringbuffer. */ |
| 46 | #define vblanktimestamp(dev, crtc, count) ( \ |
| 47 | (dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \ |
| 48 | ((count) % DRM_VBLANKTIME_RBSIZE)]) |
| 49 | |
| 50 | /* Retry timestamp calculation up to 3 times to satisfy |
| 51 | * drm_timestamp_precision before giving up. |
| 52 | */ |
| 53 | #define DRM_TIMESTAMP_MAXRETRIES 3 |
| 54 | |
| 55 | /* Threshold in nanoseconds for detection of redundant |
| 56 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. |
| 57 | */ |
| 58 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | /** |
| 61 | * Get interrupt from bus id. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 62 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | * \param inode device inode. |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 64 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * \param cmd command. |
| 66 | * \param arg user argument, pointing to a drm_irq_busid structure. |
| 67 | * \return zero on success or a negative number on failure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 68 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
| 70 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal |
| 71 | * to that of the device that this DRM instance attached to. |
| 72 | */ |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 73 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
| 74 | struct drm_file *file_priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 76 | struct drm_irq_busid *p = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Dave Airlie | 8410ea3 | 2010-12-15 03:16:38 +1000 | [diff] [blame] | 78 | if (!dev->driver->bus->irq_by_busid) |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 79 | return -EINVAL; |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 82 | return -EINVAL; |
| 83 | |
Dave Airlie | 8410ea3 | 2010-12-15 03:16:38 +1000 | [diff] [blame] | 84 | return dev->driver->bus->irq_by_busid(dev, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 87 | /* |
| 88 | * Clear vblank timestamp buffer for a crtc. |
| 89 | */ |
| 90 | static void clear_vblank_timestamps(struct drm_device *dev, int crtc) |
| 91 | { |
| 92 | memset(&dev->_vblank_time[crtc * DRM_VBLANKTIME_RBSIZE], 0, |
| 93 | DRM_VBLANKTIME_RBSIZE * sizeof(struct timeval)); |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * Disable vblank irq's on crtc, make sure that last vblank count |
| 98 | * of hardware and corresponding consistent software vblank counter |
| 99 | * are preserved, even if there are any spurious vblank irq's after |
| 100 | * disable. |
| 101 | */ |
| 102 | static void vblank_disable_and_save(struct drm_device *dev, int crtc) |
| 103 | { |
| 104 | unsigned long irqflags; |
| 105 | u32 vblcount; |
| 106 | s64 diff_ns; |
| 107 | int vblrc; |
| 108 | struct timeval tvblank; |
| 109 | |
| 110 | /* Prevent vblank irq processing while disabling vblank irqs, |
| 111 | * so no updates of timestamps or count can happen after we've |
| 112 | * disabled. Needed to prevent races in case of delayed irq's. |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 113 | */ |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 114 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
| 115 | |
| 116 | dev->driver->disable_vblank(dev, crtc); |
| 117 | dev->vblank_enabled[crtc] = 0; |
| 118 | |
| 119 | /* No further vblank irq's will be processed after |
| 120 | * this point. Get current hardware vblank count and |
| 121 | * vblank timestamp, repeat until they are consistent. |
| 122 | * |
| 123 | * FIXME: There is still a race condition here and in |
| 124 | * drm_update_vblank_count() which can cause off-by-one |
| 125 | * reinitialization of software vblank counter. If gpu |
| 126 | * vblank counter doesn't increment exactly at the leading |
| 127 | * edge of a vblank interval, then we can lose 1 count if |
| 128 | * we happen to execute between start of vblank and the |
| 129 | * delayed gpu counter increment. |
| 130 | */ |
| 131 | do { |
| 132 | dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); |
| 133 | vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); |
| 134 | } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); |
| 135 | |
| 136 | /* Compute time difference to stored timestamp of last vblank |
| 137 | * as updated by last invocation of drm_handle_vblank() in vblank irq. |
| 138 | */ |
| 139 | vblcount = atomic_read(&dev->_vblank_count[crtc]); |
| 140 | diff_ns = timeval_to_ns(&tvblank) - |
| 141 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); |
| 142 | |
| 143 | /* If there is at least 1 msec difference between the last stored |
| 144 | * timestamp and tvblank, then we are currently executing our |
| 145 | * disable inside a new vblank interval, the tvblank timestamp |
| 146 | * corresponds to this new vblank interval and the irq handler |
| 147 | * for this vblank didn't run yet and won't run due to our disable. |
| 148 | * Therefore we need to do the job of drm_handle_vblank() and |
| 149 | * increment the vblank counter by one to account for this vblank. |
| 150 | * |
| 151 | * Skip this step if there isn't any high precision timestamp |
| 152 | * available. In that case we can't account for this and just |
| 153 | * hope for the best. |
| 154 | */ |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 155 | if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 156 | atomic_inc(&dev->_vblank_count[crtc]); |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 157 | smp_mb__after_atomic_inc(); |
| 158 | } |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 159 | |
| 160 | /* Invalidate all timestamps while vblank irq's are off. */ |
| 161 | clear_vblank_timestamps(dev, crtc); |
| 162 | |
| 163 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 164 | } |
| 165 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 166 | static void vblank_disable_fn(unsigned long arg) |
| 167 | { |
| 168 | struct drm_device *dev = (struct drm_device *)arg; |
| 169 | unsigned long irqflags; |
| 170 | int i; |
| 171 | |
| 172 | if (!dev->vblank_disable_allowed) |
| 173 | return; |
| 174 | |
| 175 | for (i = 0; i < dev->num_crtcs; i++) { |
| 176 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| 177 | if (atomic_read(&dev->vblank_refcount[i]) == 0 && |
| 178 | dev->vblank_enabled[i]) { |
| 179 | DRM_DEBUG("disabling vblank on crtc %d\n", i); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 180 | vblank_disable_and_save(dev, i); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 181 | } |
| 182 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| 183 | } |
| 184 | } |
| 185 | |
Keith Packard | 5244021 | 2008-11-18 09:30:25 -0800 | [diff] [blame] | 186 | void drm_vblank_cleanup(struct drm_device *dev) |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 187 | { |
| 188 | /* Bail if the driver didn't call drm_vblank_init() */ |
| 189 | if (dev->num_crtcs == 0) |
| 190 | return; |
| 191 | |
Laurent Pinchart | 7eb3b2c | 2012-05-17 13:27:19 +0200 | [diff] [blame] | 192 | del_timer_sync(&dev->vblank_disable_timer); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 193 | |
| 194 | vblank_disable_fn((unsigned long)dev); |
| 195 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 196 | kfree(dev->vbl_queue); |
| 197 | kfree(dev->_vblank_count); |
| 198 | kfree(dev->vblank_refcount); |
| 199 | kfree(dev->vblank_enabled); |
| 200 | kfree(dev->last_vblank); |
| 201 | kfree(dev->last_vblank_wait); |
| 202 | kfree(dev->vblank_inmodeset); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 203 | kfree(dev->_vblank_time); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 204 | |
| 205 | dev->num_crtcs = 0; |
| 206 | } |
Jerome Glisse | e77cef9 | 2010-01-07 15:39:13 +0100 | [diff] [blame] | 207 | EXPORT_SYMBOL(drm_vblank_cleanup); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 208 | |
| 209 | int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
| 210 | { |
| 211 | int i, ret = -ENOMEM; |
| 212 | |
| 213 | setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, |
| 214 | (unsigned long)dev); |
| 215 | spin_lock_init(&dev->vbl_lock); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 216 | spin_lock_init(&dev->vblank_time_lock); |
| 217 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 218 | dev->num_crtcs = num_crtcs; |
| 219 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 220 | dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs, |
| 221 | GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 222 | if (!dev->vbl_queue) |
| 223 | goto err; |
| 224 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 225 | dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 226 | if (!dev->_vblank_count) |
| 227 | goto err; |
| 228 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 229 | dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs, |
| 230 | GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 231 | if (!dev->vblank_refcount) |
| 232 | goto err; |
| 233 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 234 | dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 235 | if (!dev->vblank_enabled) |
| 236 | goto err; |
| 237 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 238 | dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 239 | if (!dev->last_vblank) |
| 240 | goto err; |
| 241 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 242 | dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL); |
Eric Anholt | fede5c9 | 2008-12-19 17:23:38 -0800 | [diff] [blame] | 243 | if (!dev->last_vblank_wait) |
| 244 | goto err; |
| 245 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 246 | dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 247 | if (!dev->vblank_inmodeset) |
| 248 | goto err; |
| 249 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 250 | dev->_vblank_time = kcalloc(num_crtcs * DRM_VBLANKTIME_RBSIZE, |
| 251 | sizeof(struct timeval), GFP_KERNEL); |
| 252 | if (!dev->_vblank_time) |
| 253 | goto err; |
| 254 | |
| 255 | DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n"); |
| 256 | |
| 257 | /* Driver specific high-precision vblank timestamping supported? */ |
| 258 | if (dev->driver->get_vblank_timestamp) |
| 259 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); |
| 260 | else |
| 261 | DRM_INFO("No driver support for vblank timestamp query.\n"); |
| 262 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 263 | /* Zero per-crtc vblank stuff */ |
| 264 | for (i = 0; i < num_crtcs; i++) { |
| 265 | init_waitqueue_head(&dev->vbl_queue[i]); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 266 | atomic_set(&dev->_vblank_count[i], 0); |
| 267 | atomic_set(&dev->vblank_refcount[i], 0); |
| 268 | } |
| 269 | |
| 270 | dev->vblank_disable_allowed = 0; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 271 | return 0; |
| 272 | |
| 273 | err: |
| 274 | drm_vblank_cleanup(dev); |
| 275 | return ret; |
| 276 | } |
| 277 | EXPORT_SYMBOL(drm_vblank_init); |
| 278 | |
Dave Airlie | 28d5204 | 2009-09-21 14:33:58 +1000 | [diff] [blame] | 279 | static void drm_irq_vgaarb_nokms(void *cookie, bool state) |
| 280 | { |
| 281 | struct drm_device *dev = cookie; |
| 282 | |
| 283 | if (dev->driver->vgaarb_irq) { |
| 284 | dev->driver->vgaarb_irq(dev, state); |
| 285 | return; |
| 286 | } |
| 287 | |
| 288 | if (!dev->irq_enabled) |
| 289 | return; |
| 290 | |
Joonyoung Shim | 5037f8a | 2011-08-04 05:41:01 +0000 | [diff] [blame] | 291 | if (state) { |
| 292 | if (dev->driver->irq_uninstall) |
| 293 | dev->driver->irq_uninstall(dev); |
| 294 | } else { |
| 295 | if (dev->driver->irq_preinstall) |
| 296 | dev->driver->irq_preinstall(dev); |
| 297 | if (dev->driver->irq_postinstall) |
| 298 | dev->driver->irq_postinstall(dev); |
Dave Airlie | 28d5204 | 2009-09-21 14:33:58 +1000 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | /** |
| 303 | * Install IRQ handler. |
| 304 | * |
| 305 | * \param dev DRM device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | * |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 307 | * Initializes the IRQ related data. Installs the handler, calling the driver |
Sascha Hauer | 884a53e | 2012-02-29 09:06:21 +0100 | [diff] [blame] | 308 | * \c irq_preinstall() and \c irq_postinstall() functions |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | * before and after the installation. |
| 310 | */ |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 311 | int drm_irq_install(struct drm_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 313 | int ret; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 314 | unsigned long sh_flags = 0; |
Dave Airlie | b8da7de | 2009-06-02 16:50:35 +1000 | [diff] [blame] | 315 | char *irqname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 318 | return -EINVAL; |
| 319 | |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 320 | if (drm_dev_to_irq(dev) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | return -EINVAL; |
| 322 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 323 | mutex_lock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | /* Driver must have been initialized */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 326 | if (!dev->dev_private) { |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 327 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | return -EINVAL; |
| 329 | } |
| 330 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 331 | if (dev->irq_enabled) { |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 332 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return -EBUSY; |
| 334 | } |
| 335 | dev->irq_enabled = 1; |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 336 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 338 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 340 | /* Before installing handler */ |
Joonyoung Shim | 5037f8a | 2011-08-04 05:41:01 +0000 | [diff] [blame] | 341 | if (dev->driver->irq_preinstall) |
| 342 | dev->driver->irq_preinstall(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 344 | /* Install handler */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
Thomas Gleixner | 935f6e3 | 2006-07-01 19:29:34 -0700 | [diff] [blame] | 346 | sh_flags = IRQF_SHARED; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 347 | |
Dave Airlie | b8da7de | 2009-06-02 16:50:35 +1000 | [diff] [blame] | 348 | if (dev->devname) |
| 349 | irqname = dev->devname; |
| 350 | else |
| 351 | irqname = dev->driver->name; |
| 352 | |
Jesse Barnes | 9bfbd5c | 2008-09-15 15:00:33 -0700 | [diff] [blame] | 353 | ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
Dave Airlie | b8da7de | 2009-06-02 16:50:35 +1000 | [diff] [blame] | 354 | sh_flags, irqname, dev); |
Jesse Barnes | 9bfbd5c | 2008-09-15 15:00:33 -0700 | [diff] [blame] | 355 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 356 | if (ret < 0) { |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 357 | mutex_lock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | dev->irq_enabled = 0; |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 359 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | return ret; |
| 361 | } |
| 362 | |
Dave Airlie | 28d5204 | 2009-09-21 14:33:58 +1000 | [diff] [blame] | 363 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 364 | vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL); |
| 365 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 366 | /* After installing handler */ |
Joonyoung Shim | 5037f8a | 2011-08-04 05:41:01 +0000 | [diff] [blame] | 367 | if (dev->driver->irq_postinstall) |
| 368 | ret = dev->driver->irq_postinstall(dev); |
| 369 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 370 | if (ret < 0) { |
| 371 | mutex_lock(&dev->struct_mutex); |
| 372 | dev->irq_enabled = 0; |
| 373 | mutex_unlock(&dev->struct_mutex); |
Joonyoung Shim | e1c44ac | 2011-08-04 05:41:00 +0000 | [diff] [blame] | 374 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 375 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
| 376 | free_irq(drm_dev_to_irq(dev), dev); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 379 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 381 | EXPORT_SYMBOL(drm_irq_install); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | /** |
| 384 | * Uninstall the IRQ handler. |
| 385 | * |
| 386 | * \param dev DRM device. |
| 387 | * |
Sascha Hauer | 884a53e | 2012-02-29 09:06:21 +0100 | [diff] [blame] | 388 | * Calls the driver's \c irq_uninstall() function, and stops the irq. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | */ |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 390 | int drm_irq_uninstall(struct drm_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
Jesse Barnes | dc1336f | 2009-01-06 10:21:24 -0800 | [diff] [blame] | 392 | unsigned long irqflags; |
| 393 | int irq_enabled, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 396 | return -EINVAL; |
| 397 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 398 | mutex_lock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | irq_enabled = dev->irq_enabled; |
| 400 | dev->irq_enabled = 0; |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 401 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Jesse Barnes | dc1336f | 2009-01-06 10:21:24 -0800 | [diff] [blame] | 403 | /* |
| 404 | * Wake up any waiters so they don't hang. |
| 405 | */ |
Ben Skeggs | bde4889 | 2011-07-04 12:52:27 +1000 | [diff] [blame] | 406 | if (dev->num_crtcs) { |
| 407 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| 408 | for (i = 0; i < dev->num_crtcs; i++) { |
| 409 | DRM_WAKEUP(&dev->vbl_queue[i]); |
| 410 | dev->vblank_enabled[i] = 0; |
| 411 | dev->last_vblank[i] = |
| 412 | dev->driver->get_vblank_counter(dev, i); |
| 413 | } |
| 414 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
Jesse Barnes | dc1336f | 2009-01-06 10:21:24 -0800 | [diff] [blame] | 415 | } |
Jesse Barnes | dc1336f | 2009-01-06 10:21:24 -0800 | [diff] [blame] | 416 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 417 | if (!irq_enabled) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return -EINVAL; |
| 419 | |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 420 | DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Dave Airlie | 28d5204 | 2009-09-21 14:33:58 +1000 | [diff] [blame] | 422 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 423 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
| 424 | |
Joonyoung Shim | 5037f8a | 2011-08-04 05:41:01 +0000 | [diff] [blame] | 425 | if (dev->driver->irq_uninstall) |
| 426 | dev->driver->irq_uninstall(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 428 | free_irq(drm_dev_to_irq(dev), dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | return 0; |
| 431 | } |
| 432 | EXPORT_SYMBOL(drm_irq_uninstall); |
| 433 | |
| 434 | /** |
| 435 | * IRQ control ioctl. |
| 436 | * |
| 437 | * \param inode device inode. |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 438 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | * \param cmd command. |
| 440 | * \param arg user argument, pointing to a drm_control structure. |
| 441 | * \return zero on success or a negative number on failure. |
| 442 | * |
| 443 | * Calls irq_install() or irq_uninstall() according to \p arg. |
| 444 | */ |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 445 | int drm_control(struct drm_device *dev, void *data, |
| 446 | struct drm_file *file_priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | { |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 448 | struct drm_control *ctl = data; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 449 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 450 | /* if we haven't irq we fallback for compatibility reasons - |
| 451 | * this used to be a separate function in drm_dma.h |
| 452 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 455 | switch (ctl->func) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | case DRM_INST_HANDLER: |
| 457 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 458 | return 0; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 459 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 460 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 462 | ctl->irq != drm_dev_to_irq(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return -EINVAL; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 464 | return drm_irq_install(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | case DRM_UNINST_HANDLER: |
| 466 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 467 | return 0; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 468 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 469 | return 0; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 470 | return drm_irq_uninstall(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | default: |
| 472 | return -EINVAL; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /** |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 477 | * drm_calc_timestamping_constants - Calculate and |
| 478 | * store various constants which are later needed by |
| 479 | * vblank and swap-completion timestamping, e.g, by |
| 480 | * drm_calc_vbltimestamp_from_scanoutpos(). |
| 481 | * They are derived from crtc's true scanout timing, |
| 482 | * so they take things like panel scaling or other |
| 483 | * adjustments into account. |
| 484 | * |
| 485 | * @crtc drm_crtc whose timestamp constants should be updated. |
| 486 | * |
| 487 | */ |
| 488 | void drm_calc_timestamping_constants(struct drm_crtc *crtc) |
| 489 | { |
| 490 | s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0; |
| 491 | u64 dotclock; |
| 492 | |
| 493 | /* Dot clock in Hz: */ |
| 494 | dotclock = (u64) crtc->hwmode.clock * 1000; |
| 495 | |
Mario Kleiner | 9be6f8a | 2011-02-21 05:42:02 +0100 | [diff] [blame] | 496 | /* Fields of interlaced scanout modes are only halve a frame duration. |
| 497 | * Double the dotclock to get halve the frame-/line-/pixelduration. |
| 498 | */ |
| 499 | if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE) |
| 500 | dotclock *= 2; |
| 501 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 502 | /* Valid dotclock? */ |
| 503 | if (dotclock > 0) { |
| 504 | /* Convert scanline length in pixels and video dot clock to |
| 505 | * line duration, frame duration and pixel duration in |
| 506 | * nanoseconds: |
| 507 | */ |
| 508 | pixeldur_ns = (s64) div64_u64(1000000000, dotclock); |
| 509 | linedur_ns = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal * |
| 510 | 1000000000), dotclock); |
| 511 | framedur_ns = (s64) crtc->hwmode.crtc_vtotal * linedur_ns; |
| 512 | } else |
| 513 | DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n", |
| 514 | crtc->base.id); |
| 515 | |
| 516 | crtc->pixeldur_ns = pixeldur_ns; |
| 517 | crtc->linedur_ns = linedur_ns; |
| 518 | crtc->framedur_ns = framedur_ns; |
| 519 | |
| 520 | DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
| 521 | crtc->base.id, crtc->hwmode.crtc_htotal, |
| 522 | crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay); |
| 523 | DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n", |
| 524 | crtc->base.id, (int) dotclock/1000, (int) framedur_ns, |
| 525 | (int) linedur_ns, (int) pixeldur_ns); |
| 526 | } |
| 527 | EXPORT_SYMBOL(drm_calc_timestamping_constants); |
| 528 | |
| 529 | /** |
| 530 | * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms |
| 531 | * drivers. Implements calculation of exact vblank timestamps from |
| 532 | * given drm_display_mode timings and current video scanout position |
| 533 | * of a crtc. This can be called from within get_vblank_timestamp() |
| 534 | * implementation of a kms driver to implement the actual timestamping. |
| 535 | * |
| 536 | * Should return timestamps conforming to the OML_sync_control OpenML |
| 537 | * extension specification. The timestamp corresponds to the end of |
| 538 | * the vblank interval, aka start of scanout of topmost-leftmost display |
| 539 | * pixel in the following video frame. |
| 540 | * |
| 541 | * Requires support for optional dev->driver->get_scanout_position() |
| 542 | * in kms driver, plus a bit of setup code to provide a drm_display_mode |
| 543 | * that corresponds to the true scanout timing. |
| 544 | * |
| 545 | * The current implementation only handles standard video modes. It |
| 546 | * returns as no operation if a doublescan or interlaced video mode is |
| 547 | * active. Higher level code is expected to handle this. |
| 548 | * |
| 549 | * @dev: DRM device. |
| 550 | * @crtc: Which crtc's vblank timestamp to retrieve. |
| 551 | * @max_error: Desired maximum allowable error in timestamps (nanosecs). |
| 552 | * On return contains true maximum error of timestamp. |
| 553 | * @vblank_time: Pointer to struct timeval which should receive the timestamp. |
| 554 | * @flags: Flags to pass to driver: |
| 555 | * 0 = Default. |
| 556 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. |
| 557 | * @refcrtc: drm_crtc* of crtc which defines scanout timing. |
| 558 | * |
| 559 | * Returns negative value on error, failure or if not supported in current |
| 560 | * video mode: |
| 561 | * |
| 562 | * -EINVAL - Invalid crtc. |
| 563 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
| 564 | * -ENOTSUPP - Function not supported in current display mode. |
| 565 | * -EIO - Failed, e.g., due to failed scanout position query. |
| 566 | * |
| 567 | * Returns or'ed positive status flags on success: |
| 568 | * |
| 569 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. |
| 570 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. |
| 571 | * |
| 572 | */ |
| 573 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc, |
| 574 | int *max_error, |
| 575 | struct timeval *vblank_time, |
| 576 | unsigned flags, |
| 577 | struct drm_crtc *refcrtc) |
| 578 | { |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 579 | ktime_t stime, etime, mono_time_offset; |
| 580 | struct timeval tv_etime; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 581 | struct drm_display_mode *mode; |
| 582 | int vbl_status, vtotal, vdisplay; |
| 583 | int vpos, hpos, i; |
| 584 | s64 framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; |
| 585 | bool invbl; |
| 586 | |
| 587 | if (crtc < 0 || crtc >= dev->num_crtcs) { |
| 588 | DRM_ERROR("Invalid crtc %d\n", crtc); |
| 589 | return -EINVAL; |
| 590 | } |
| 591 | |
| 592 | /* Scanout position query not supported? Should not happen. */ |
| 593 | if (!dev->driver->get_scanout_position) { |
| 594 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); |
| 595 | return -EIO; |
| 596 | } |
| 597 | |
| 598 | mode = &refcrtc->hwmode; |
| 599 | vtotal = mode->crtc_vtotal; |
| 600 | vdisplay = mode->crtc_vdisplay; |
| 601 | |
| 602 | /* Durations of frames, lines, pixels in nanoseconds. */ |
| 603 | framedur_ns = refcrtc->framedur_ns; |
| 604 | linedur_ns = refcrtc->linedur_ns; |
| 605 | pixeldur_ns = refcrtc->pixeldur_ns; |
| 606 | |
| 607 | /* If mode timing undefined, just return as no-op: |
| 608 | * Happens during initial modesetting of a crtc. |
| 609 | */ |
| 610 | if (vtotal <= 0 || vdisplay <= 0 || framedur_ns == 0) { |
| 611 | DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc); |
| 612 | return -EAGAIN; |
| 613 | } |
| 614 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 615 | /* Get current scanout position with system timestamp. |
| 616 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times |
| 617 | * if single query takes longer than max_error nanoseconds. |
| 618 | * |
| 619 | * This guarantees a tight bound on maximum error if |
| 620 | * code gets preempted or delayed for some reason. |
| 621 | */ |
| 622 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { |
| 623 | /* Disable preemption to make it very likely to |
| 624 | * succeed in the first iteration even on PREEMPT_RT kernel. |
| 625 | */ |
| 626 | preempt_disable(); |
| 627 | |
| 628 | /* Get system timestamp before query. */ |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 629 | stime = ktime_get(); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 630 | |
| 631 | /* Get vertical and horizontal scanout pos. vpos, hpos. */ |
| 632 | vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos); |
| 633 | |
| 634 | /* Get system timestamp after query. */ |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 635 | etime = ktime_get(); |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 636 | if (!drm_timestamp_monotonic) |
| 637 | mono_time_offset = ktime_get_monotonic_offset(); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 638 | |
| 639 | preempt_enable(); |
| 640 | |
| 641 | /* Return as no-op if scanout query unsupported or failed. */ |
| 642 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { |
| 643 | DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", |
| 644 | crtc, vbl_status); |
| 645 | return -EIO; |
| 646 | } |
| 647 | |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 648 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 649 | |
| 650 | /* Accept result with < max_error nsecs timing uncertainty. */ |
| 651 | if (duration_ns <= (s64) *max_error) |
| 652 | break; |
| 653 | } |
| 654 | |
| 655 | /* Noisy system timing? */ |
| 656 | if (i == DRM_TIMESTAMP_MAXRETRIES) { |
| 657 | DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n", |
| 658 | crtc, (int) duration_ns/1000, *max_error/1000, i); |
| 659 | } |
| 660 | |
| 661 | /* Return upper bound of timestamp precision error. */ |
| 662 | *max_error = (int) duration_ns; |
| 663 | |
| 664 | /* Check if in vblank area: |
| 665 | * vpos is >=0 in video scanout area, but negative |
| 666 | * within vblank area, counting down the number of lines until |
| 667 | * start of scanout. |
| 668 | */ |
| 669 | invbl = vbl_status & DRM_SCANOUTPOS_INVBL; |
| 670 | |
| 671 | /* Convert scanout position into elapsed time at raw_time query |
| 672 | * since start of scanout at first display scanline. delta_ns |
| 673 | * can be negative if start of scanout hasn't happened yet. |
| 674 | */ |
| 675 | delta_ns = (s64) vpos * linedur_ns + (s64) hpos * pixeldur_ns; |
| 676 | |
| 677 | /* Is vpos outside nominal vblank area, but less than |
| 678 | * 1/100 of a frame height away from start of vblank? |
| 679 | * If so, assume this isn't a massively delayed vblank |
| 680 | * interrupt, but a vblank interrupt that fired a few |
| 681 | * microseconds before true start of vblank. Compensate |
| 682 | * by adding a full frame duration to the final timestamp. |
| 683 | * Happens, e.g., on ATI R500, R600. |
| 684 | * |
| 685 | * We only do this if DRM_CALLED_FROM_VBLIRQ. |
| 686 | */ |
| 687 | if ((flags & DRM_CALLED_FROM_VBLIRQ) && !invbl && |
| 688 | ((vdisplay - vpos) < vtotal / 100)) { |
| 689 | delta_ns = delta_ns - framedur_ns; |
| 690 | |
| 691 | /* Signal this correction as "applied". */ |
| 692 | vbl_status |= 0x8; |
| 693 | } |
| 694 | |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 695 | if (!drm_timestamp_monotonic) |
| 696 | etime = ktime_sub(etime, mono_time_offset); |
| 697 | |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 698 | /* save this only for debugging purposes */ |
| 699 | tv_etime = ktime_to_timeval(etime); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 700 | /* Subtract time delta from raw timestamp to get final |
| 701 | * vblank_time timestamp for end of vblank. |
| 702 | */ |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 703 | etime = ktime_sub_ns(etime, delta_ns); |
| 704 | *vblank_time = ktime_to_timeval(etime); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 705 | |
Joe Perches | bbb0aef | 2011-04-17 20:35:52 -0700 | [diff] [blame] | 706 | DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
| 707 | crtc, (int)vbl_status, hpos, vpos, |
Imre Deak | e62f2f5 | 2012-10-23 18:53:25 +0000 | [diff] [blame] | 708 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
Joe Perches | bbb0aef | 2011-04-17 20:35:52 -0700 | [diff] [blame] | 709 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
| 710 | (int)duration_ns/1000, i); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 711 | |
| 712 | vbl_status = DRM_VBLANKTIME_SCANOUTPOS_METHOD; |
| 713 | if (invbl) |
| 714 | vbl_status |= DRM_VBLANKTIME_INVBL; |
| 715 | |
| 716 | return vbl_status; |
| 717 | } |
| 718 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); |
| 719 | |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 720 | static struct timeval get_drm_timestamp(void) |
| 721 | { |
| 722 | ktime_t now; |
| 723 | |
| 724 | now = ktime_get(); |
| 725 | if (!drm_timestamp_monotonic) |
| 726 | now = ktime_sub(now, ktime_get_monotonic_offset()); |
| 727 | |
| 728 | return ktime_to_timeval(now); |
| 729 | } |
| 730 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 731 | /** |
| 732 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent |
| 733 | * vblank interval. |
| 734 | * |
| 735 | * @dev: DRM device |
| 736 | * @crtc: which crtc's vblank timestamp to retrieve |
| 737 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
| 738 | * @flags: Flags to pass to driver: |
| 739 | * 0 = Default. |
| 740 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler. |
| 741 | * |
| 742 | * Fetches the system timestamp corresponding to the time of the most recent |
| 743 | * vblank interval on specified crtc. May call into kms-driver to |
| 744 | * compute the timestamp with a high-precision GPU specific method. |
| 745 | * |
| 746 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() |
| 747 | * call, i.e., it isn't very precisely locked to the true vblank. |
| 748 | * |
| 749 | * Returns non-zero if timestamp is considered to be very precise. |
| 750 | */ |
| 751 | u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc, |
| 752 | struct timeval *tvblank, unsigned flags) |
| 753 | { |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 754 | int ret; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 755 | |
| 756 | /* Define requested maximum error on timestamps (nanoseconds). */ |
| 757 | int max_error = (int) drm_timestamp_precision * 1000; |
| 758 | |
| 759 | /* Query driver if possible and precision timestamping enabled. */ |
| 760 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { |
| 761 | ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error, |
| 762 | tvblank, flags); |
| 763 | if (ret > 0) |
| 764 | return (u32) ret; |
| 765 | } |
| 766 | |
| 767 | /* GPU high precision timestamp query unsupported or failed. |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 768 | * Return current monotonic/gettimeofday timestamp as best estimate. |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 769 | */ |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 770 | *tvblank = get_drm_timestamp(); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 771 | |
| 772 | return 0; |
| 773 | } |
| 774 | EXPORT_SYMBOL(drm_get_last_vbltimestamp); |
| 775 | |
| 776 | /** |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 777 | * drm_vblank_count - retrieve "cooked" vblank counter value |
| 778 | * @dev: DRM device |
| 779 | * @crtc: which counter to retrieve |
| 780 | * |
| 781 | * Fetches the "cooked" vblank count value that represents the number of |
| 782 | * vblank events since the system was booted, including lost events due to |
| 783 | * modesetting activity. |
| 784 | */ |
| 785 | u32 drm_vblank_count(struct drm_device *dev, int crtc) |
| 786 | { |
| 787 | return atomic_read(&dev->_vblank_count[crtc]); |
| 788 | } |
| 789 | EXPORT_SYMBOL(drm_vblank_count); |
| 790 | |
| 791 | /** |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 792 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value |
| 793 | * and the system timestamp corresponding to that vblank counter value. |
| 794 | * |
| 795 | * @dev: DRM device |
| 796 | * @crtc: which counter to retrieve |
| 797 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
| 798 | * |
| 799 | * Fetches the "cooked" vblank count value that represents the number of |
| 800 | * vblank events since the system was booted, including lost events due to |
| 801 | * modesetting activity. Returns corresponding system timestamp of the time |
| 802 | * of the vblank interval that corresponds to the current value vblank counter |
| 803 | * value. |
| 804 | */ |
| 805 | u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc, |
| 806 | struct timeval *vblanktime) |
| 807 | { |
| 808 | u32 cur_vblank; |
| 809 | |
| 810 | /* Read timestamp from slot of _vblank_time ringbuffer |
| 811 | * that corresponds to current vblank count. Retry if |
| 812 | * count has incremented during readout. This works like |
| 813 | * a seqlock. |
| 814 | */ |
| 815 | do { |
| 816 | cur_vblank = atomic_read(&dev->_vblank_count[crtc]); |
| 817 | *vblanktime = vblanktimestamp(dev, crtc, cur_vblank); |
| 818 | smp_rmb(); |
| 819 | } while (cur_vblank != atomic_read(&dev->_vblank_count[crtc])); |
| 820 | |
| 821 | return cur_vblank; |
| 822 | } |
| 823 | EXPORT_SYMBOL(drm_vblank_count_and_time); |
| 824 | |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 825 | static void send_vblank_event(struct drm_device *dev, |
| 826 | struct drm_pending_vblank_event *e, |
| 827 | unsigned long seq, struct timeval *now) |
| 828 | { |
| 829 | WARN_ON_SMP(!spin_is_locked(&dev->event_lock)); |
| 830 | e->event.sequence = seq; |
| 831 | e->event.tv_sec = now->tv_sec; |
| 832 | e->event.tv_usec = now->tv_usec; |
| 833 | |
| 834 | list_add_tail(&e->base.link, |
| 835 | &e->base.file_priv->event_list); |
| 836 | wake_up_interruptible(&e->base.file_priv->event_wait); |
| 837 | trace_drm_vblank_event_delivered(e->base.pid, e->pipe, |
| 838 | e->event.sequence); |
| 839 | } |
| 840 | |
| 841 | /** |
| 842 | * drm_send_vblank_event - helper to send vblank event after pageflip |
| 843 | * @dev: DRM device |
| 844 | * @crtc: CRTC in question |
| 845 | * @e: the event to send |
| 846 | * |
| 847 | * Updates sequence # and timestamp on event, and sends it to userspace. |
| 848 | * Caller must hold event lock. |
| 849 | */ |
| 850 | void drm_send_vblank_event(struct drm_device *dev, int crtc, |
| 851 | struct drm_pending_vblank_event *e) |
| 852 | { |
| 853 | struct timeval now; |
| 854 | unsigned int seq; |
| 855 | if (crtc >= 0) { |
| 856 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
| 857 | } else { |
| 858 | seq = 0; |
Imre Deak | c61eef7 | 2012-10-23 18:53:26 +0000 | [diff] [blame] | 859 | |
| 860 | now = get_drm_timestamp(); |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 861 | } |
| 862 | send_vblank_event(dev, e, seq, &now); |
| 863 | } |
| 864 | EXPORT_SYMBOL(drm_send_vblank_event); |
| 865 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 866 | /** |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 867 | * drm_update_vblank_count - update the master vblank counter |
| 868 | * @dev: DRM device |
| 869 | * @crtc: counter to update |
| 870 | * |
| 871 | * Call back into the driver to update the appropriate vblank counter |
| 872 | * (specified by @crtc). Deal with wraparound, if it occurred, and |
| 873 | * update the last read value so we can deal with wraparound on the next |
| 874 | * call if necessary. |
| 875 | * |
| 876 | * Only necessary when going from off->on, to account for frames we |
| 877 | * didn't get an interrupt for. |
| 878 | * |
| 879 | * Note: caller must hold dev->vbl_lock since this reads & writes |
| 880 | * device vblank fields. |
| 881 | */ |
| 882 | static void drm_update_vblank_count(struct drm_device *dev, int crtc) |
| 883 | { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 884 | u32 cur_vblank, diff, tslot, rc; |
| 885 | struct timeval t_vblank; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 886 | |
| 887 | /* |
| 888 | * Interrupts were disabled prior to this call, so deal with counter |
| 889 | * wrap if needed. |
| 890 | * NOTE! It's possible we lost a full dev->max_vblank_count events |
| 891 | * here if the register is small or we had vblank interrupts off for |
| 892 | * a long time. |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 893 | * |
| 894 | * We repeat the hardware vblank counter & timestamp query until |
| 895 | * we get consistent results. This to prevent races between gpu |
| 896 | * updating its hardware counter while we are retrieving the |
| 897 | * corresponding vblank timestamp. |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 898 | */ |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 899 | do { |
| 900 | cur_vblank = dev->driver->get_vblank_counter(dev, crtc); |
| 901 | rc = drm_get_last_vbltimestamp(dev, crtc, &t_vblank, 0); |
| 902 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, crtc)); |
| 903 | |
| 904 | /* Deal with counter wrap */ |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 905 | diff = cur_vblank - dev->last_vblank[crtc]; |
| 906 | if (cur_vblank < dev->last_vblank[crtc]) { |
| 907 | diff += dev->max_vblank_count; |
| 908 | |
| 909 | DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", |
| 910 | crtc, dev->last_vblank[crtc], cur_vblank, diff); |
| 911 | } |
| 912 | |
| 913 | DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", |
| 914 | crtc, diff); |
| 915 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 916 | /* Reinitialize corresponding vblank timestamp if high-precision query |
| 917 | * available. Skip this step if query unsupported or failed. Will |
| 918 | * reinitialize delayed at next vblank interrupt in that case. |
| 919 | */ |
| 920 | if (rc) { |
| 921 | tslot = atomic_read(&dev->_vblank_count[crtc]) + diff; |
| 922 | vblanktimestamp(dev, crtc, tslot) = t_vblank; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 923 | } |
| 924 | |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 925 | smp_mb__before_atomic_inc(); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 926 | atomic_add(diff, &dev->_vblank_count[crtc]); |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 927 | smp_mb__after_atomic_inc(); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | /** |
| 931 | * drm_vblank_get - get a reference count on vblank events |
| 932 | * @dev: DRM device |
| 933 | * @crtc: which CRTC to own |
| 934 | * |
| 935 | * Acquire a reference count on vblank events to avoid having them disabled |
| 936 | * while in use. |
| 937 | * |
| 938 | * RETURNS |
| 939 | * Zero on success, nonzero on failure. |
| 940 | */ |
| 941 | int drm_vblank_get(struct drm_device *dev, int crtc) |
| 942 | { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 943 | unsigned long irqflags, irqflags2; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 944 | int ret = 0; |
| 945 | |
| 946 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| 947 | /* Going from 0->1 means we have to enable interrupts again */ |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 948 | if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 949 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 950 | if (!dev->vblank_enabled[crtc]) { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 951 | /* Enable vblank irqs under vblank_time_lock protection. |
| 952 | * All vblank count & timestamp updates are held off |
| 953 | * until we are done reinitializing master counter and |
| 954 | * timestamps. Filtercode in drm_handle_vblank() will |
| 955 | * prevent double-accounting of same vblank interval. |
| 956 | */ |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 957 | ret = dev->driver->enable_vblank(dev, crtc); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 958 | DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", |
| 959 | crtc, ret); |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 960 | if (ret) |
| 961 | atomic_dec(&dev->vblank_refcount[crtc]); |
| 962 | else { |
| 963 | dev->vblank_enabled[crtc] = 1; |
| 964 | drm_update_vblank_count(dev, crtc); |
| 965 | } |
| 966 | } |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 967 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 968 | } else { |
| 969 | if (!dev->vblank_enabled[crtc]) { |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 970 | atomic_dec(&dev->vblank_refcount[crtc]); |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 971 | ret = -EINVAL; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 972 | } |
| 973 | } |
| 974 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| 975 | |
| 976 | return ret; |
| 977 | } |
| 978 | EXPORT_SYMBOL(drm_vblank_get); |
| 979 | |
| 980 | /** |
| 981 | * drm_vblank_put - give up ownership of vblank events |
| 982 | * @dev: DRM device |
| 983 | * @crtc: which counter to give up |
| 984 | * |
| 985 | * Release ownership of a given vblank counter, turning off interrupts |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 986 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 987 | */ |
| 988 | void drm_vblank_put(struct drm_device *dev, int crtc) |
| 989 | { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 990 | BUG_ON(atomic_read(&dev->vblank_refcount[crtc]) == 0); |
Chris Wilson | b3f5e73 | 2009-02-19 14:48:22 +0000 | [diff] [blame] | 991 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 992 | /* Last user schedules interrupt disable */ |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 993 | if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) && |
| 994 | (drm_vblank_offdelay > 0)) |
| 995 | mod_timer(&dev->vblank_disable_timer, |
| 996 | jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000)); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 997 | } |
| 998 | EXPORT_SYMBOL(drm_vblank_put); |
| 999 | |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1000 | /** |
| 1001 | * drm_vblank_off - disable vblank events on a CRTC |
| 1002 | * @dev: DRM device |
| 1003 | * @crtc: CRTC in question |
| 1004 | * |
| 1005 | * Caller must hold event lock. |
| 1006 | */ |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 1007 | void drm_vblank_off(struct drm_device *dev, int crtc) |
| 1008 | { |
Christopher James Halse Rogers | 498548e | 2011-04-27 16:10:57 +1000 | [diff] [blame] | 1009 | struct drm_pending_vblank_event *e, *t; |
| 1010 | struct timeval now; |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 1011 | unsigned long irqflags; |
Christopher James Halse Rogers | 498548e | 2011-04-27 16:10:57 +1000 | [diff] [blame] | 1012 | unsigned int seq; |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 1013 | |
| 1014 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1015 | vblank_disable_and_save(dev, crtc); |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 1016 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
Christopher James Halse Rogers | 498548e | 2011-04-27 16:10:57 +1000 | [diff] [blame] | 1017 | |
| 1018 | /* Send any queued vblank events, lest the natives grow disquiet */ |
| 1019 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
| 1020 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
| 1021 | if (e->pipe != crtc) |
| 1022 | continue; |
| 1023 | DRM_DEBUG("Sending premature vblank event on disable: \ |
| 1024 | wanted %d, current %d\n", |
| 1025 | e->event.sequence, seq); |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1026 | list_del(&e->base.link); |
Christopher James Halse Rogers | 498548e | 2011-04-27 16:10:57 +1000 | [diff] [blame] | 1027 | drm_vblank_put(dev, e->pipe); |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1028 | send_vblank_event(dev, e, seq, &now); |
Christopher James Halse Rogers | 498548e | 2011-04-27 16:10:57 +1000 | [diff] [blame] | 1029 | } |
| 1030 | |
Li Peng | 778c902 | 2009-11-09 12:51:22 +0800 | [diff] [blame] | 1031 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| 1032 | } |
| 1033 | EXPORT_SYMBOL(drm_vblank_off); |
| 1034 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1035 | /** |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1036 | * drm_vblank_pre_modeset - account for vblanks across mode sets |
| 1037 | * @dev: DRM device |
| 1038 | * @crtc: CRTC in question |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1039 | * |
| 1040 | * Account for vblank events across mode setting events, which will likely |
| 1041 | * reset the hardware frame counter. |
| 1042 | */ |
| 1043 | void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) |
| 1044 | { |
Jerome Glisse | e77cef9 | 2010-01-07 15:39:13 +0100 | [diff] [blame] | 1045 | /* vblank is not initialized (IRQ not installed ?) */ |
| 1046 | if (!dev->num_crtcs) |
| 1047 | return; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1048 | /* |
| 1049 | * To avoid all the problems that might happen if interrupts |
| 1050 | * were enabled/disabled around or between these calls, we just |
| 1051 | * have the kernel take a reference on the CRTC (just once though |
| 1052 | * to avoid corrupting the count if multiple, mismatch calls occur), |
| 1053 | * so that interrupts remain enabled in the interim. |
| 1054 | */ |
| 1055 | if (!dev->vblank_inmodeset[crtc]) { |
Chris Wilson | b3f5e73 | 2009-02-19 14:48:22 +0000 | [diff] [blame] | 1056 | dev->vblank_inmodeset[crtc] = 0x1; |
| 1057 | if (drm_vblank_get(dev, crtc) == 0) |
| 1058 | dev->vblank_inmodeset[crtc] |= 0x2; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1059 | } |
| 1060 | } |
| 1061 | EXPORT_SYMBOL(drm_vblank_pre_modeset); |
| 1062 | |
| 1063 | void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
| 1064 | { |
| 1065 | unsigned long irqflags; |
| 1066 | |
| 1067 | if (dev->vblank_inmodeset[crtc]) { |
| 1068 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| 1069 | dev->vblank_disable_allowed = 1; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1070 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
Chris Wilson | b3f5e73 | 2009-02-19 14:48:22 +0000 | [diff] [blame] | 1071 | |
| 1072 | if (dev->vblank_inmodeset[crtc] & 0x2) |
| 1073 | drm_vblank_put(dev, crtc); |
| 1074 | |
| 1075 | dev->vblank_inmodeset[crtc] = 0; |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1076 | } |
| 1077 | } |
| 1078 | EXPORT_SYMBOL(drm_vblank_post_modeset); |
| 1079 | |
| 1080 | /** |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1081 | * drm_modeset_ctl - handle vblank event counter changes across mode switch |
| 1082 | * @DRM_IOCTL_ARGS: standard ioctl arguments |
| 1083 | * |
| 1084 | * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET |
| 1085 | * ioctls around modesetting so that any lost vblank events are accounted for. |
| 1086 | * |
| 1087 | * Generally the counter will reset across mode sets. If interrupts are |
| 1088 | * enabled around this call, we don't have to do anything since the counter |
| 1089 | * will have already been incremented. |
| 1090 | */ |
| 1091 | int drm_modeset_ctl(struct drm_device *dev, void *data, |
| 1092 | struct drm_file *file_priv) |
| 1093 | { |
| 1094 | struct drm_modeset_ctl *modeset = data; |
Dave Airlie | 1922756 | 2011-02-24 08:35:06 +1000 | [diff] [blame] | 1095 | unsigned int crtc; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1096 | |
| 1097 | /* If drm_vblank_init() hasn't been called yet, just no-op */ |
| 1098 | if (!dev->num_crtcs) |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 1099 | return 0; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1100 | |
Laurent Pinchart | 2993555 | 2012-05-30 00:58:09 +0200 | [diff] [blame] | 1101 | /* KMS drivers handle this internally */ |
| 1102 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 1103 | return 0; |
| 1104 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1105 | crtc = modeset->crtc; |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 1106 | if (crtc >= dev->num_crtcs) |
| 1107 | return -EINVAL; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1108 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1109 | switch (modeset->cmd) { |
| 1110 | case _DRM_PRE_MODESET: |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1111 | drm_vblank_pre_modeset(dev, crtc); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1112 | break; |
| 1113 | case _DRM_POST_MODESET: |
Dave Airlie | f453ba0 | 2008-11-07 14:05:41 -0800 | [diff] [blame] | 1114 | drm_vblank_post_modeset(dev, crtc); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1115 | break; |
| 1116 | default: |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 1117 | return -EINVAL; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1118 | } |
| 1119 | |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 1120 | return 0; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1121 | } |
| 1122 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1123 | static int drm_queue_vblank_event(struct drm_device *dev, int pipe, |
| 1124 | union drm_wait_vblank *vblwait, |
| 1125 | struct drm_file *file_priv) |
| 1126 | { |
| 1127 | struct drm_pending_vblank_event *e; |
| 1128 | struct timeval now; |
| 1129 | unsigned long flags; |
| 1130 | unsigned int seq; |
Chris Wilson | ea5d552 | 2010-12-01 19:41:31 +0000 | [diff] [blame] | 1131 | int ret; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1132 | |
| 1133 | e = kzalloc(sizeof *e, GFP_KERNEL); |
Chris Wilson | ea5d552 | 2010-12-01 19:41:31 +0000 | [diff] [blame] | 1134 | if (e == NULL) { |
| 1135 | ret = -ENOMEM; |
| 1136 | goto err_put; |
| 1137 | } |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1138 | |
| 1139 | e->pipe = pipe; |
Jesse Barnes | b9c2c9a | 2010-07-01 16:48:09 -0700 | [diff] [blame] | 1140 | e->base.pid = current->pid; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1141 | e->event.base.type = DRM_EVENT_VBLANK; |
| 1142 | e->event.base.length = sizeof e->event; |
| 1143 | e->event.user_data = vblwait->request.signal; |
| 1144 | e->base.event = &e->event.base; |
| 1145 | e->base.file_priv = file_priv; |
| 1146 | e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; |
| 1147 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1148 | spin_lock_irqsave(&dev->event_lock, flags); |
| 1149 | |
| 1150 | if (file_priv->event_space < sizeof e->event) { |
Chris Wilson | ea5d552 | 2010-12-01 19:41:31 +0000 | [diff] [blame] | 1151 | ret = -EBUSY; |
| 1152 | goto err_unlock; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1153 | } |
| 1154 | |
| 1155 | file_priv->event_space -= sizeof e->event; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1156 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
| 1157 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1158 | if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) && |
| 1159 | (seq - vblwait->request.sequence) <= (1 << 23)) { |
| 1160 | vblwait->request.sequence = seq + 1; |
Jesse Barnes | 4a92164 | 2009-11-10 08:21:25 +0000 | [diff] [blame] | 1161 | vblwait->reply.sequence = vblwait->request.sequence; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1162 | } |
| 1163 | |
| 1164 | DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n", |
| 1165 | vblwait->request.sequence, seq, pipe); |
| 1166 | |
Jesse Barnes | b9c2c9a | 2010-07-01 16:48:09 -0700 | [diff] [blame] | 1167 | trace_drm_vblank_event_queued(current->pid, pipe, |
| 1168 | vblwait->request.sequence); |
| 1169 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1170 | e->event.sequence = vblwait->request.sequence; |
| 1171 | if ((seq - vblwait->request.sequence) <= (1 << 23)) { |
Dan Carpenter | 6f33162 | 2010-12-09 08:35:40 +0300 | [diff] [blame] | 1172 | drm_vblank_put(dev, pipe); |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1173 | send_vblank_event(dev, e, seq, &now); |
Mario Kleiner | 000fa7c | 2010-12-10 16:00:19 +0100 | [diff] [blame] | 1174 | vblwait->reply.sequence = seq; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1175 | } else { |
Ilija Hadzic | a6778e9 | 2011-10-31 13:11:57 -0400 | [diff] [blame] | 1176 | /* drm_handle_vblank_events will call drm_vblank_put */ |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1177 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
Mario Kleiner | 000fa7c | 2010-12-10 16:00:19 +0100 | [diff] [blame] | 1178 | vblwait->reply.sequence = vblwait->request.sequence; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 1182 | |
| 1183 | return 0; |
Chris Wilson | ea5d552 | 2010-12-01 19:41:31 +0000 | [diff] [blame] | 1184 | |
| 1185 | err_unlock: |
| 1186 | spin_unlock_irqrestore(&dev->event_lock, flags); |
| 1187 | kfree(e); |
| 1188 | err_put: |
Dan Carpenter | 6f33162 | 2010-12-09 08:35:40 +0300 | [diff] [blame] | 1189 | drm_vblank_put(dev, pipe); |
Chris Wilson | ea5d552 | 2010-12-01 19:41:31 +0000 | [diff] [blame] | 1190 | return ret; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1191 | } |
| 1192 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1193 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | * Wait for VBLANK. |
| 1195 | * |
| 1196 | * \param inode device inode. |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 1197 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | * \param cmd command. |
| 1199 | * \param data user argument, pointing to a drm_wait_vblank structure. |
| 1200 | * \return zero on success or a negative number on failure. |
| 1201 | * |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1202 | * This function enables the vblank interrupt on the pipe requested, then |
| 1203 | * sleeps waiting for the requested sequence number to occur, and drops |
| 1204 | * the vblank interrupt refcount afterwards. (vblank irq disable follows that |
| 1205 | * after a timeout with no further vblank waits scheduled). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | */ |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1207 | int drm_wait_vblank(struct drm_device *dev, void *data, |
| 1208 | struct drm_file *file_priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | { |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1210 | union drm_wait_vblank *vblwait = data; |
Laurent Pinchart | 4a1b071 | 2012-05-17 13:27:21 +0200 | [diff] [blame] | 1211 | int ret; |
Ilija Hadzic | 19b01b5 | 2011-03-18 16:58:04 -0500 | [diff] [blame] | 1212 | unsigned int flags, seq, crtc, high_crtc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
Jordan Crouse | dcdb167 | 2010-05-27 13:40:25 -0600 | [diff] [blame] | 1214 | if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return -EINVAL; |
| 1216 | |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1217 | if (vblwait->request.type & _DRM_VBLANK_SIGNAL) |
| 1218 | return -EINVAL; |
| 1219 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1220 | if (vblwait->request.type & |
Ilija Hadzic | 19b01b5 | 2011-03-18 16:58:04 -0500 | [diff] [blame] | 1221 | ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
| 1222 | _DRM_VBLANK_HIGH_CRTC_MASK)) { |
=?utf-8?q?Michel_D=C3=A4nzer?= | 776c944 | 2006-10-24 22:24:38 +1000 | [diff] [blame] | 1223 | DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1224 | vblwait->request.type, |
Ilija Hadzic | 19b01b5 | 2011-03-18 16:58:04 -0500 | [diff] [blame] | 1225 | (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK | |
| 1226 | _DRM_VBLANK_HIGH_CRTC_MASK)); |
=?utf-8?q?Michel_D=C3=A4nzer?= | 776c944 | 2006-10-24 22:24:38 +1000 | [diff] [blame] | 1227 | return -EINVAL; |
| 1228 | } |
| 1229 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1230 | flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
Ilija Hadzic | 19b01b5 | 2011-03-18 16:58:04 -0500 | [diff] [blame] | 1231 | high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK); |
| 1232 | if (high_crtc) |
| 1233 | crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT; |
| 1234 | else |
| 1235 | crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1236 | if (crtc >= dev->num_crtcs) |
=?utf-8?q?Michel_D=C3=A4nzer?= | 776c944 | 2006-10-24 22:24:38 +1000 | [diff] [blame] | 1237 | return -EINVAL; |
| 1238 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1239 | ret = drm_vblank_get(dev, crtc); |
| 1240 | if (ret) { |
Paul Rolland | 8d3457e | 2009-08-09 12:24:01 +1000 | [diff] [blame] | 1241 | DRM_DEBUG("failed to acquire vblank counter, %d\n", ret); |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1242 | return ret; |
| 1243 | } |
| 1244 | seq = drm_vblank_count(dev, crtc); |
=?utf-8?q?Michel_D=C3=A4nzer?= | 776c944 | 2006-10-24 22:24:38 +1000 | [diff] [blame] | 1245 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1246 | switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | case _DRM_VBLANK_RELATIVE: |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1248 | vblwait->request.sequence += seq; |
| 1249 | vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | case _DRM_VBLANK_ABSOLUTE: |
| 1251 | break; |
| 1252 | default: |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1253 | ret = -EINVAL; |
| 1254 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
| 1256 | |
Ilija Hadzic | a6778e9 | 2011-10-31 13:11:57 -0400 | [diff] [blame] | 1257 | if (flags & _DRM_VBLANK_EVENT) { |
| 1258 | /* must hold on to the vblank ref until the event fires |
| 1259 | * drm_vblank_put will be called asynchronously |
| 1260 | */ |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1261 | return drm_queue_vblank_event(dev, crtc, vblwait, file_priv); |
Ilija Hadzic | a6778e9 | 2011-10-31 13:11:57 -0400 | [diff] [blame] | 1262 | } |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1263 | |
=?utf-8?q?Michel_D=C3=A4nzer?= | ab285d7 | 2006-10-24 23:34:18 +1000 | [diff] [blame] | 1264 | if ((flags & _DRM_VBLANK_NEXTONMISS) && |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame] | 1265 | (seq - vblwait->request.sequence) <= (1<<23)) { |
| 1266 | vblwait->request.sequence = seq + 1; |
=?utf-8?q?Michel_D=C3=A4nzer?= | ab285d7 | 2006-10-24 23:34:18 +1000 | [diff] [blame] | 1267 | } |
| 1268 | |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1269 | DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
| 1270 | vblwait->request.sequence, crtc); |
| 1271 | dev->last_vblank_wait[crtc] = vblwait->request.sequence; |
| 1272 | DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, |
| 1273 | (((drm_vblank_count(dev, crtc) - |
| 1274 | vblwait->request.sequence) <= (1 << 23)) || |
| 1275 | !dev->irq_enabled)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1277 | if (ret != -EINTR) { |
| 1278 | struct timeval now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1280 | vblwait->reply.sequence = drm_vblank_count_and_time(dev, crtc, &now); |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1281 | vblwait->reply.tval_sec = now.tv_sec; |
| 1282 | vblwait->reply.tval_usec = now.tv_usec; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1283 | |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1284 | DRM_DEBUG("returning %d to client\n", |
| 1285 | vblwait->reply.sequence); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | } else { |
Eric Anholt | 30b2363 | 2009-01-27 21:19:41 -0800 | [diff] [blame] | 1287 | DRM_DEBUG("vblank wait interrupted by signal\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | } |
| 1289 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1290 | done: |
| 1291 | drm_vblank_put(dev, crtc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | return ret; |
| 1293 | } |
| 1294 | |
Sachin Kamat | ea7f7ab | 2012-08-01 17:15:31 +0530 | [diff] [blame] | 1295 | static void drm_handle_vblank_events(struct drm_device *dev, int crtc) |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1296 | { |
| 1297 | struct drm_pending_vblank_event *e, *t; |
| 1298 | struct timeval now; |
| 1299 | unsigned long flags; |
| 1300 | unsigned int seq; |
| 1301 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1302 | seq = drm_vblank_count_and_time(dev, crtc, &now); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1303 | |
| 1304 | spin_lock_irqsave(&dev->event_lock, flags); |
| 1305 | |
| 1306 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
| 1307 | if (e->pipe != crtc) |
| 1308 | continue; |
| 1309 | if ((seq - e->event.sequence) > (1<<23)) |
| 1310 | continue; |
| 1311 | |
| 1312 | DRM_DEBUG("vblank event on %d, current %d\n", |
| 1313 | e->event.sequence, seq); |
| 1314 | |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1315 | list_del(&e->base.link); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1316 | drm_vblank_put(dev, e->pipe); |
Rob Clark | c6eefa1 | 2012-10-16 22:48:40 +0000 | [diff] [blame] | 1317 | send_vblank_event(dev, e, seq, &now); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1318 | } |
| 1319 | |
| 1320 | spin_unlock_irqrestore(&dev->event_lock, flags); |
Jesse Barnes | ac2874b | 2010-07-01 16:47:31 -0700 | [diff] [blame] | 1321 | |
| 1322 | trace_drm_vblank_event(crtc, seq); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1323 | } |
| 1324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | /** |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1326 | * drm_handle_vblank - handle a vblank event |
| 1327 | * @dev: DRM device |
| 1328 | * @crtc: where this event occurred |
| 1329 | * |
| 1330 | * Drivers should call this routine in their vblank interrupt handlers to |
| 1331 | * update the vblank counter and send any signals that may be pending. |
| 1332 | */ |
Chris Wilson | 78c6e17 | 2011-01-31 10:48:04 +0000 | [diff] [blame] | 1333 | bool drm_handle_vblank(struct drm_device *dev, int crtc) |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1334 | { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1335 | u32 vblcount; |
| 1336 | s64 diff_ns; |
| 1337 | struct timeval tvblank; |
| 1338 | unsigned long irqflags; |
| 1339 | |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1340 | if (!dev->num_crtcs) |
Chris Wilson | 78c6e17 | 2011-01-31 10:48:04 +0000 | [diff] [blame] | 1341 | return false; |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1342 | |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1343 | /* Need timestamp lock to prevent concurrent execution with |
| 1344 | * vblank enable/disable, as this would cause inconsistent |
| 1345 | * or corrupted timestamps and vblank counts. |
| 1346 | */ |
| 1347 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
| 1348 | |
| 1349 | /* Vblank irq handling disabled. Nothing to do. */ |
| 1350 | if (!dev->vblank_enabled[crtc]) { |
| 1351 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
Chris Wilson | 78c6e17 | 2011-01-31 10:48:04 +0000 | [diff] [blame] | 1352 | return false; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | /* Fetch corresponding timestamp for this vblank interval from |
| 1356 | * driver and store it in proper slot of timestamp ringbuffer. |
| 1357 | */ |
| 1358 | |
| 1359 | /* Get current timestamp and count. */ |
| 1360 | vblcount = atomic_read(&dev->_vblank_count[crtc]); |
| 1361 | drm_get_last_vbltimestamp(dev, crtc, &tvblank, DRM_CALLED_FROM_VBLIRQ); |
| 1362 | |
| 1363 | /* Compute time difference to timestamp of last vblank */ |
| 1364 | diff_ns = timeval_to_ns(&tvblank) - |
| 1365 | timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount)); |
| 1366 | |
| 1367 | /* Update vblank timestamp and count if at least |
| 1368 | * DRM_REDUNDANT_VBLIRQ_THRESH_NS nanoseconds |
| 1369 | * difference between last stored timestamp and current |
| 1370 | * timestamp. A smaller difference means basically |
| 1371 | * identical timestamps. Happens if this vblank has |
| 1372 | * been already processed and this is a redundant call, |
| 1373 | * e.g., due to spurious vblank interrupts. We need to |
| 1374 | * ignore those for accounting. |
| 1375 | */ |
Mario Kleiner | c4cc383 | 2011-02-21 05:42:00 +0100 | [diff] [blame] | 1376 | if (abs64(diff_ns) > DRM_REDUNDANT_VBLIRQ_THRESH_NS) { |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1377 | /* Store new timestamp in ringbuffer. */ |
| 1378 | vblanktimestamp(dev, crtc, vblcount + 1) = tvblank; |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1379 | |
| 1380 | /* Increment cooked vblank count. This also atomically commits |
| 1381 | * the timestamp computed above. |
| 1382 | */ |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 1383 | smp_mb__before_atomic_inc(); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1384 | atomic_inc(&dev->_vblank_count[crtc]); |
Mario Kleiner | bc21512 | 2011-02-21 05:42:01 +0100 | [diff] [blame] | 1385 | smp_mb__after_atomic_inc(); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1386 | } else { |
| 1387 | DRM_DEBUG("crtc %d: Redundant vblirq ignored. diff_ns = %d\n", |
| 1388 | crtc, (int) diff_ns); |
| 1389 | } |
| 1390 | |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1391 | DRM_WAKEUP(&dev->vbl_queue[crtc]); |
Kristian Høgsberg | c9a9c5e | 2009-09-12 04:33:34 +1000 | [diff] [blame] | 1392 | drm_handle_vblank_events(dev, crtc); |
Mario Kleiner | 27641c3 | 2010-10-23 04:20:23 +0200 | [diff] [blame] | 1393 | |
| 1394 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
Chris Wilson | 78c6e17 | 2011-01-31 10:48:04 +0000 | [diff] [blame] | 1395 | return true; |
Jesse Barnes | 0a3e67a | 2008-09-30 12:14:26 -0700 | [diff] [blame] | 1396 | } |
| 1397 | EXPORT_SYMBOL(drm_handle_vblank); |