The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_irq.c

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    1 /*-
    2  * Copyright 2003 Eric Anholt
    3  * All Rights Reserved.
    4  *
    5  * Permission is hereby granted, free of charge, to any person obtaining a
    6  * copy of this software and associated documentation files (the "Software"),
    7  * to deal in the Software without restriction, including without limitation
    8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    9  * and/or sell copies of the Software, and to permit persons to whom the
   10  * Software is furnished to do so, subject to the following conditions:
   11  *
   12  * The above copyright notice and this permission notice (including the next
   13  * paragraph) shall be included in all copies or substantial portions of the
   14  * Software.
   15  *
   16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   19  * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   20  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   22  *
   23  * Authors:
   24  *    Eric Anholt <anholt@FreeBSD.org>
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 /** @file drm_irq.c
   32  * Support code for handling setup/teardown of interrupt handlers and
   33  * handing interrupt handlers off to the drivers.
   34  */
   35 
   36 #include "dev/drm/drmP.h"
   37 #include "dev/drm/drm.h"
   38 
   39 int drm_irq_by_busid(struct drm_device *dev, void *data,
   40                      struct drm_file *file_priv)
   41 {
   42         struct drm_irq_busid *irq = data;
   43 
   44         if ((irq->busnum >> 8) != dev->pci_domain ||
   45             (irq->busnum & 0xff) != dev->pci_bus ||
   46             irq->devnum != dev->pci_slot ||
   47             irq->funcnum != dev->pci_func)
   48                 return EINVAL;
   49 
   50         irq->irq = dev->irq;
   51 
   52         DRM_DEBUG("%d:%d:%d => IRQ %d\n",
   53             irq->busnum, irq->devnum, irq->funcnum, irq->irq);
   54 
   55         return 0;
   56 }
   57 
   58 static irqreturn_t
   59 drm_irq_handler_wrap(DRM_IRQ_ARGS)
   60 {
   61         struct drm_device *dev = arg;
   62 
   63         DRM_SPINLOCK(&dev->irq_lock);
   64         dev->driver->irq_handler(arg);
   65         DRM_SPINUNLOCK(&dev->irq_lock);
   66 }
   67 
   68 static void vblank_disable_fn(void *arg)
   69 {
   70         struct drm_device *dev = (struct drm_device *)arg;
   71         int i;
   72 
   73         /* Make sure that we are called with the lock held */
   74         mtx_assert(&dev->vbl_lock, MA_OWNED);
   75 
   76         if (callout_pending(&dev->vblank_disable_timer)) {
   77                 /* callout was reset */
   78                 return;
   79         }
   80         if (!callout_active(&dev->vblank_disable_timer)) {
   81                 /* callout was stopped */
   82                 return;
   83         }
   84         callout_deactivate(&dev->vblank_disable_timer);
   85 
   86         DRM_DEBUG("vblank_disable: %s\n", dev->vblank_disable_allowed ?
   87                 "allowed" : "denied");
   88         if (!dev->vblank_disable_allowed)
   89                 return;
   90 
   91         for (i = 0; i < dev->num_crtcs; i++) {
   92                 if (dev->vblank[i].refcount == 0 &&
   93                     dev->vblank[i].enabled && !dev->vblank[i].inmodeset) {
   94                         DRM_DEBUG("disabling vblank on crtc %d\n", i);
   95                         dev->vblank[i].last =
   96                             dev->driver->get_vblank_counter(dev, i);
   97                         dev->driver->disable_vblank(dev, i);
   98                         dev->vblank[i].enabled = 0;
   99                 }
  100         }
  101 }
  102 
  103 void drm_vblank_cleanup(struct drm_device *dev)
  104 {
  105         /* Bail if the driver didn't call drm_vblank_init() */
  106         if (dev->num_crtcs == 0)
  107                 return;
  108 
  109         DRM_SPINLOCK(&dev->vbl_lock);
  110         callout_stop(&dev->vblank_disable_timer);
  111         DRM_SPINUNLOCK(&dev->vbl_lock);
  112 
  113         callout_drain(&dev->vblank_disable_timer);
  114 
  115         DRM_SPINLOCK(&dev->vbl_lock);
  116         vblank_disable_fn((void *)dev);
  117         DRM_SPINUNLOCK(&dev->vbl_lock);
  118 
  119         free(dev->vblank, DRM_MEM_DRIVER);
  120 
  121         dev->num_crtcs = 0;
  122 }
  123 
  124 int drm_vblank_init(struct drm_device *dev, int num_crtcs)
  125 {
  126         int i, ret = ENOMEM;
  127 
  128         callout_init_mtx(&dev->vblank_disable_timer, &dev->vbl_lock, 0);
  129         dev->num_crtcs = num_crtcs;
  130 
  131         dev->vblank = malloc(sizeof(struct drm_vblank_info) * num_crtcs,
  132             DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
  133         if (!dev->vblank)
  134             goto err;
  135 
  136         DRM_DEBUG("\n");
  137 
  138         /* Zero per-crtc vblank stuff */
  139         DRM_SPINLOCK(&dev->vbl_lock);
  140         for (i = 0; i < num_crtcs; i++) {
  141                 DRM_INIT_WAITQUEUE(&dev->vblank[i].queue);
  142                 dev->vblank[i].refcount = 0;
  143                 atomic_store_rel_32(&dev->vblank[i].count, 0);
  144         }
  145         dev->vblank_disable_allowed = 0;
  146         DRM_SPINUNLOCK(&dev->vbl_lock);
  147 
  148         return 0;
  149 
  150 err:
  151         drm_vblank_cleanup(dev);
  152         return ret;
  153 }
  154 
  155 int drm_irq_install(struct drm_device *dev)
  156 {
  157         int crtc, retcode;
  158 
  159         if (dev->irq == 0 || dev->dev_private == NULL)
  160                 return EINVAL;
  161 
  162         DRM_DEBUG("irq=%d\n", dev->irq);
  163 
  164         DRM_LOCK();
  165         if (dev->irq_enabled) {
  166                 DRM_UNLOCK();
  167                 return EBUSY;
  168         }
  169         dev->irq_enabled = 1;
  170 
  171         dev->context_flag = 0;
  172 
  173         /* Before installing handler */
  174         dev->driver->irq_preinstall(dev);
  175         DRM_UNLOCK();
  176 
  177         /* Install handler */
  178 #if __FreeBSD_version >= 700031
  179         retcode = bus_setup_intr(dev->device, dev->irqr,
  180                                  INTR_TYPE_TTY | INTR_MPSAFE,
  181                                  NULL, drm_irq_handler_wrap, dev, &dev->irqh);
  182 #else
  183         retcode = bus_setup_intr(dev->device, dev->irqr,
  184                                  INTR_TYPE_TTY | INTR_MPSAFE,
  185                                  drm_irq_handler_wrap, dev, &dev->irqh);
  186 #endif
  187         if (retcode != 0)
  188                 goto err;
  189 
  190         /* After installing handler */
  191         DRM_LOCK();
  192         dev->driver->irq_postinstall(dev);
  193         DRM_UNLOCK();
  194         if (dev->driver->enable_vblank) {
  195                 DRM_SPINLOCK(&dev->vbl_lock);
  196                 for( crtc = 0 ; crtc < dev->num_crtcs ; crtc++) {
  197                         if (dev->driver->enable_vblank(dev, crtc) == 0) {
  198                                 dev->vblank[crtc].enabled = 1;
  199                         }
  200                 }
  201                 callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
  202                     (timeout_t *)vblank_disable_fn, (void *)dev);
  203                 DRM_SPINUNLOCK(&dev->vbl_lock);
  204         }
  205 
  206         return 0;
  207 err:
  208         DRM_LOCK();
  209         dev->irq_enabled = 0;
  210         DRM_UNLOCK();
  211 
  212         return retcode;
  213 }
  214 
  215 int drm_irq_uninstall(struct drm_device *dev)
  216 {
  217         int crtc;
  218 
  219         if (!dev->irq_enabled)
  220                 return EINVAL;
  221 
  222         dev->irq_enabled = 0;
  223 
  224         /*
  225         * Wake up any waiters so they don't hang.
  226         */
  227         DRM_SPINLOCK(&dev->vbl_lock);
  228         for (crtc = 0; crtc < dev->num_crtcs; crtc++) {
  229                 if (dev->vblank[crtc].enabled) {
  230                         DRM_WAKEUP(&dev->vblank[crtc].queue);
  231                         dev->vblank[crtc].last =
  232                             dev->driver->get_vblank_counter(dev, crtc);
  233                         dev->vblank[crtc].enabled = 0;
  234                 }
  235         }
  236         DRM_SPINUNLOCK(&dev->vbl_lock);
  237 
  238         DRM_DEBUG("irq=%d\n", dev->irq);
  239 
  240         dev->driver->irq_uninstall(dev);
  241 
  242         DRM_UNLOCK();
  243         bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
  244         DRM_LOCK();
  245 
  246         return 0;
  247 }
  248 
  249 int drm_control(struct drm_device *dev, void *data, struct drm_file *file_priv)
  250 {
  251         struct drm_control *ctl = data;
  252         int err;
  253 
  254         switch (ctl->func) {
  255         case DRM_INST_HANDLER:
  256                 /* Handle drivers whose DRM used to require IRQ setup but the
  257                  * no longer does.
  258                  */
  259                 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
  260                         return 0;
  261                 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
  262                     ctl->irq != dev->irq)
  263                         return EINVAL;
  264                 return drm_irq_install(dev);
  265         case DRM_UNINST_HANDLER:
  266                 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
  267                         return 0;
  268                 DRM_LOCK();
  269                 err = drm_irq_uninstall(dev);
  270                 DRM_UNLOCK();
  271                 return err;
  272         default:
  273                 return EINVAL;
  274         }
  275 }
  276 
  277 u32 drm_vblank_count(struct drm_device *dev, int crtc)
  278 {
  279         return atomic_load_acq_32(&dev->vblank[crtc].count);
  280 }
  281 
  282 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
  283 {
  284         u32 cur_vblank, diff;
  285 
  286         /*
  287          * Interrupts were disabled prior to this call, so deal with counter
  288          * wrap if needed.
  289          * NOTE!  It's possible we lost a full dev->max_vblank_count events
  290          * here if the register is small or we had vblank interrupts off for
  291          * a long time.
  292          */
  293         cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
  294         diff = cur_vblank - dev->vblank[crtc].last;
  295         if (cur_vblank < dev->vblank[crtc].last) {
  296                 diff += dev->max_vblank_count;
  297 
  298                 DRM_DEBUG("vblank[%d].last=0x%x, cur_vblank=0x%x => diff=0x%x\n",
  299                     crtc, dev->vblank[crtc].last, cur_vblank, diff);
  300         }
  301 
  302         DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
  303             crtc, diff);
  304 
  305         atomic_add_rel_32(&dev->vblank[crtc].count, diff);
  306 }
  307 
  308 int drm_vblank_get(struct drm_device *dev, int crtc)
  309 {
  310         int ret = 0;
  311 
  312         /* Make sure that we are called with the lock held */
  313         mtx_assert(&dev->vbl_lock, MA_OWNED);
  314 
  315         /* Going from 0->1 means we have to enable interrupts again */
  316         if (++dev->vblank[crtc].refcount == 1 &&
  317             !dev->vblank[crtc].enabled) {
  318                 ret = dev->driver->enable_vblank(dev, crtc);
  319                 DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
  320                 if (ret)
  321                         --dev->vblank[crtc].refcount;
  322                 else {
  323                         dev->vblank[crtc].enabled = 1;
  324                         drm_update_vblank_count(dev, crtc);
  325                 }
  326         }
  327 
  328         if (dev->vblank[crtc].enabled)
  329                 dev->vblank[crtc].last =
  330                     dev->driver->get_vblank_counter(dev, crtc);
  331 
  332         return ret;
  333 }
  334 
  335 void drm_vblank_put(struct drm_device *dev, int crtc)
  336 {
  337         /* Make sure that we are called with the lock held */
  338         mtx_assert(&dev->vbl_lock, MA_OWNED);
  339 
  340         KASSERT(dev->vblank[crtc].refcount > 0,
  341             ("invalid refcount"));
  342 
  343         /* Last user schedules interrupt disable */
  344         if (--dev->vblank[crtc].refcount == 0)
  345             callout_reset(&dev->vblank_disable_timer, 5 * DRM_HZ,
  346                 (timeout_t *)vblank_disable_fn, (void *)dev);
  347 }
  348 
  349 int drm_modeset_ctl(struct drm_device *dev, void *data,
  350                     struct drm_file *file_priv)
  351 {
  352         struct drm_modeset_ctl *modeset = data;
  353         int crtc, ret = 0;
  354 
  355         /* If drm_vblank_init() hasn't been called yet, just no-op */
  356         if (!dev->num_crtcs)
  357                 goto out;
  358 
  359         crtc = modeset->crtc;
  360         if (crtc >= dev->num_crtcs) {
  361                 ret = EINVAL;
  362                 goto out;
  363         }
  364 
  365         /*
  366          * To avoid all the problems that might happen if interrupts
  367          * were enabled/disabled around or between these calls, we just
  368          * have the kernel take a reference on the CRTC (just once though
  369          * to avoid corrupting the count if multiple, mismatch calls occur),
  370          * so that interrupts remain enabled in the interim.
  371          */
  372         switch (modeset->cmd) {
  373         case _DRM_PRE_MODESET:
  374                 DRM_DEBUG("pre-modeset, crtc %d\n", crtc);
  375                 DRM_SPINLOCK(&dev->vbl_lock);
  376                 if (!dev->vblank[crtc].inmodeset) {
  377                         dev->vblank[crtc].inmodeset = 0x1;
  378                         if (drm_vblank_get(dev, crtc) == 0)
  379                                 dev->vblank[crtc].inmodeset |= 0x2;
  380                 }
  381                 DRM_SPINUNLOCK(&dev->vbl_lock);
  382                 break;
  383         case _DRM_POST_MODESET:
  384                 DRM_DEBUG("post-modeset, crtc %d\n", crtc);
  385                 DRM_SPINLOCK(&dev->vbl_lock);
  386                 if (dev->vblank[crtc].inmodeset) {
  387                         if (dev->vblank[crtc].inmodeset & 0x2)
  388                                 drm_vblank_put(dev, crtc);
  389                         dev->vblank[crtc].inmodeset = 0;
  390                 }
  391                 dev->vblank_disable_allowed = 1;
  392                 DRM_SPINUNLOCK(&dev->vbl_lock);
  393                 break;
  394         default:
  395                 ret = EINVAL;
  396                 break;
  397         }
  398 
  399 out:
  400         return ret;
  401 }
  402 
  403 int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
  404 {
  405         union drm_wait_vblank *vblwait = data;
  406         unsigned int flags, seq, crtc;
  407         int ret = 0;
  408 
  409         if (!dev->irq_enabled)
  410                 return EINVAL;
  411 
  412         if (vblwait->request.type &
  413             ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
  414                 DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
  415                     vblwait->request.type,
  416                     (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
  417                 return EINVAL;
  418         }
  419 
  420         flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
  421         crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
  422 
  423         if (crtc >= dev->num_crtcs)
  424                 return EINVAL;
  425 
  426         DRM_SPINLOCK(&dev->vbl_lock);
  427         ret = drm_vblank_get(dev, crtc);
  428         DRM_SPINUNLOCK(&dev->vbl_lock);
  429         if (ret) {
  430                 DRM_ERROR("failed to acquire vblank counter, %d\n", ret);
  431                 return ret;
  432         }
  433         seq = drm_vblank_count(dev, crtc);
  434 
  435         switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
  436         case _DRM_VBLANK_RELATIVE:
  437                 vblwait->request.sequence += seq;
  438                 vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
  439         case _DRM_VBLANK_ABSOLUTE:
  440                 break;
  441         default:
  442                 ret = EINVAL;
  443                 goto done;
  444         }
  445 
  446         if ((flags & _DRM_VBLANK_NEXTONMISS) &&
  447             (seq - vblwait->request.sequence) <= (1<<23)) {
  448                 vblwait->request.sequence = seq + 1;
  449         }
  450 
  451         if (flags & _DRM_VBLANK_SIGNAL) {
  452                 /* There have never been any consumers */
  453                 ret = EINVAL;
  454         } else {
  455                 DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
  456                     vblwait->request.sequence, crtc);
  457                 for ( ret = 0 ; !ret && !(((drm_vblank_count(dev, crtc) -
  458                     vblwait->request.sequence) <= (1 << 23)) ||
  459                     !dev->irq_enabled) ; ) {
  460                         mtx_lock(&dev->irq_lock);
  461                         if (!(((drm_vblank_count(dev, crtc) -
  462                             vblwait->request.sequence) <= (1 << 23)) ||
  463                             !dev->irq_enabled))
  464                                 ret = mtx_sleep(&dev->vblank[crtc].queue,
  465                                     &dev->irq_lock, PCATCH, "vblwtq",
  466                                     DRM_HZ);
  467                         mtx_unlock(&dev->irq_lock);
  468                 }
  469 
  470                 if (ret != EINTR && ret != ERESTART) {
  471                         struct timeval now;
  472 
  473                         microtime(&now);
  474                         vblwait->reply.tval_sec = now.tv_sec;
  475                         vblwait->reply.tval_usec = now.tv_usec;
  476                         vblwait->reply.sequence = drm_vblank_count(dev, crtc);
  477                         DRM_DEBUG("returning %d to client, irq_enabled %d\n",
  478                             vblwait->reply.sequence, dev->irq_enabled);
  479                 } else {
  480                         DRM_DEBUG("vblank wait interrupted by signal\n");
  481                 }
  482         }
  483 
  484 done:
  485         DRM_SPINLOCK(&dev->vbl_lock);
  486         drm_vblank_put(dev, crtc);
  487         DRM_SPINUNLOCK(&dev->vbl_lock);
  488 
  489         return ret;
  490 }
  491 
  492 void drm_handle_vblank(struct drm_device *dev, int crtc)
  493 {
  494         atomic_add_rel_32(&dev->vblank[crtc].count, 1);
  495         DRM_WAKEUP(&dev->vblank[crtc].queue);
  496 }
  497 

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