| /** |
| * \file drm_irq.c |
| * IRQ support |
| * |
| * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| * \author Gareth Hughes <gareth@valinux.com> |
| */ |
| |
| /* |
| * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com |
| * |
| * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
| * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include "drmP.h" |
| |
| #include <linux/interrupt.h> /* For task queue support */ |
| |
| /** |
| * Get interrupt from bus id. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument, pointing to a drm_irq_busid structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Finds the PCI device with the specified bus id and gets its IRQ number. |
| * This IOCTL is deprecated, and will now return EINVAL for any busid not equal |
| * to that of the device that this DRM instance attached to. |
| */ |
| int drm_irq_by_busid(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_irq_busid *p = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return -EINVAL; |
| |
| if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
| (p->busnum & 0xff) != dev->pdev->bus->number || |
| p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) |
| return -EINVAL; |
| |
| p->irq = dev->pdev->irq; |
| |
| DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, |
| p->irq); |
| |
| return 0; |
| } |
| |
| static void vblank_disable_fn(unsigned long arg) |
| { |
| struct drm_device *dev = (struct drm_device *)arg; |
| unsigned long irqflags; |
| int i; |
| |
| if (!dev->vblank_disable_allowed) |
| return; |
| |
| for (i = 0; i < dev->num_crtcs; i++) { |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| if (atomic_read(&dev->vblank_refcount[i]) == 0 && |
| dev->vblank_enabled[i]) { |
| DRM_DEBUG("disabling vblank on crtc %d\n", i); |
| dev->last_vblank[i] = |
| dev->driver->get_vblank_counter(dev, i); |
| dev->driver->disable_vblank(dev, i); |
| dev->vblank_enabled[i] = 0; |
| } |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| } |
| } |
| |
| void drm_vblank_cleanup(struct drm_device *dev) |
| { |
| /* Bail if the driver didn't call drm_vblank_init() */ |
| if (dev->num_crtcs == 0) |
| return; |
| |
| del_timer(&dev->vblank_disable_timer); |
| |
| vblank_disable_fn((unsigned long)dev); |
| |
| drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs, |
| DRM_MEM_DRIVER); |
| drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs, |
| DRM_MEM_DRIVER); |
| drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) * |
| dev->num_crtcs, DRM_MEM_DRIVER); |
| drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) * |
| dev->num_crtcs, DRM_MEM_DRIVER); |
| drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) * |
| dev->num_crtcs, DRM_MEM_DRIVER); |
| drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs, |
| DRM_MEM_DRIVER); |
| drm_free(dev->last_vblank_wait, |
| sizeof(*dev->last_vblank_wait) * dev->num_crtcs, |
| DRM_MEM_DRIVER); |
| drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) * |
| dev->num_crtcs, DRM_MEM_DRIVER); |
| |
| dev->num_crtcs = 0; |
| } |
| |
| int drm_vblank_init(struct drm_device *dev, int num_crtcs) |
| { |
| int i, ret = -ENOMEM; |
| |
| setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, |
| (unsigned long)dev); |
| spin_lock_init(&dev->vbl_lock); |
| atomic_set(&dev->vbl_signal_pending, 0); |
| dev->num_crtcs = num_crtcs; |
| |
| dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs, |
| DRM_MEM_DRIVER); |
| if (!dev->vbl_queue) |
| goto err; |
| |
| dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs, |
| DRM_MEM_DRIVER); |
| if (!dev->vbl_sigs) |
| goto err; |
| |
| dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs, |
| DRM_MEM_DRIVER); |
| if (!dev->_vblank_count) |
| goto err; |
| |
| dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs, |
| DRM_MEM_DRIVER); |
| if (!dev->vblank_refcount) |
| goto err; |
| |
| dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int), |
| DRM_MEM_DRIVER); |
| if (!dev->vblank_enabled) |
| goto err; |
| |
| dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER); |
| if (!dev->last_vblank) |
| goto err; |
| |
| dev->last_vblank_wait = drm_calloc(num_crtcs, sizeof(u32), |
| DRM_MEM_DRIVER); |
| if (!dev->last_vblank_wait) |
| goto err; |
| |
| dev->vblank_inmodeset = drm_calloc(num_crtcs, sizeof(int), |
| DRM_MEM_DRIVER); |
| if (!dev->vblank_inmodeset) |
| goto err; |
| |
| /* Zero per-crtc vblank stuff */ |
| for (i = 0; i < num_crtcs; i++) { |
| init_waitqueue_head(&dev->vbl_queue[i]); |
| INIT_LIST_HEAD(&dev->vbl_sigs[i]); |
| atomic_set(&dev->_vblank_count[i], 0); |
| atomic_set(&dev->vblank_refcount[i], 0); |
| } |
| |
| dev->vblank_disable_allowed = 0; |
| |
| return 0; |
| |
| err: |
| drm_vblank_cleanup(dev); |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_vblank_init); |
| |
| /** |
| * Install IRQ handler. |
| * |
| * \param dev DRM device. |
| * |
| * Initializes the IRQ related data. Installs the handler, calling the driver |
| * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions |
| * before and after the installation. |
| */ |
| int drm_irq_install(struct drm_device *dev) |
| { |
| int ret = 0; |
| unsigned long sh_flags = 0; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return -EINVAL; |
| |
| if (dev->pdev->irq == 0) |
| return -EINVAL; |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| /* Driver must have been initialized */ |
| if (!dev->dev_private) { |
| mutex_unlock(&dev->struct_mutex); |
| return -EINVAL; |
| } |
| |
| if (dev->irq_enabled) { |
| mutex_unlock(&dev->struct_mutex); |
| return -EBUSY; |
| } |
| dev->irq_enabled = 1; |
| mutex_unlock(&dev->struct_mutex); |
| |
| DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
| |
| /* Before installing handler */ |
| dev->driver->irq_preinstall(dev); |
| |
| /* Install handler */ |
| if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
| sh_flags = IRQF_SHARED; |
| |
| ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, |
| sh_flags, dev->devname, dev); |
| |
| if (ret < 0) { |
| mutex_lock(&dev->struct_mutex); |
| dev->irq_enabled = 0; |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |
| |
| /* After installing handler */ |
| ret = dev->driver->irq_postinstall(dev); |
| if (ret < 0) { |
| mutex_lock(&dev->struct_mutex); |
| dev->irq_enabled = 0; |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_irq_install); |
| |
| /** |
| * Uninstall the IRQ handler. |
| * |
| * \param dev DRM device. |
| * |
| * Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq. |
| */ |
| int drm_irq_uninstall(struct drm_device * dev) |
| { |
| unsigned long irqflags; |
| int irq_enabled, i; |
| |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return -EINVAL; |
| |
| mutex_lock(&dev->struct_mutex); |
| irq_enabled = dev->irq_enabled; |
| dev->irq_enabled = 0; |
| mutex_unlock(&dev->struct_mutex); |
| |
| /* |
| * Wake up any waiters so they don't hang. |
| */ |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| for (i = 0; i < dev->num_crtcs; i++) { |
| DRM_WAKEUP(&dev->vbl_queue[i]); |
| dev->vblank_enabled[i] = 0; |
| } |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| |
| if (!irq_enabled) |
| return -EINVAL; |
| |
| DRM_DEBUG("irq=%d\n", dev->pdev->irq); |
| |
| dev->driver->irq_uninstall(dev); |
| |
| free_irq(dev->pdev->irq, dev); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_irq_uninstall); |
| |
| /** |
| * IRQ control ioctl. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument, pointing to a drm_control structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Calls irq_install() or irq_uninstall() according to \p arg. |
| */ |
| int drm_control(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_control *ctl = data; |
| |
| /* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */ |
| |
| |
| switch (ctl->func) { |
| case DRM_INST_HANDLER: |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return 0; |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| return 0; |
| if (dev->if_version < DRM_IF_VERSION(1, 2) && |
| ctl->irq != dev->pdev->irq) |
| return -EINVAL; |
| return drm_irq_install(dev); |
| case DRM_UNINST_HANDLER: |
| if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| return 0; |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| return 0; |
| return drm_irq_uninstall(dev); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /** |
| * drm_vblank_count - retrieve "cooked" vblank counter value |
| * @dev: DRM device |
| * @crtc: which counter to retrieve |
| * |
| * Fetches the "cooked" vblank count value that represents the number of |
| * vblank events since the system was booted, including lost events due to |
| * modesetting activity. |
| */ |
| u32 drm_vblank_count(struct drm_device *dev, int crtc) |
| { |
| return atomic_read(&dev->_vblank_count[crtc]); |
| } |
| EXPORT_SYMBOL(drm_vblank_count); |
| |
| /** |
| * drm_update_vblank_count - update the master vblank counter |
| * @dev: DRM device |
| * @crtc: counter to update |
| * |
| * Call back into the driver to update the appropriate vblank counter |
| * (specified by @crtc). Deal with wraparound, if it occurred, and |
| * update the last read value so we can deal with wraparound on the next |
| * call if necessary. |
| * |
| * Only necessary when going from off->on, to account for frames we |
| * didn't get an interrupt for. |
| * |
| * Note: caller must hold dev->vbl_lock since this reads & writes |
| * device vblank fields. |
| */ |
| static void drm_update_vblank_count(struct drm_device *dev, int crtc) |
| { |
| u32 cur_vblank, diff; |
| |
| /* |
| * Interrupts were disabled prior to this call, so deal with counter |
| * wrap if needed. |
| * NOTE! It's possible we lost a full dev->max_vblank_count events |
| * here if the register is small or we had vblank interrupts off for |
| * a long time. |
| */ |
| cur_vblank = dev->driver->get_vblank_counter(dev, crtc); |
| diff = cur_vblank - dev->last_vblank[crtc]; |
| if (cur_vblank < dev->last_vblank[crtc]) { |
| diff += dev->max_vblank_count; |
| |
| DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", |
| crtc, dev->last_vblank[crtc], cur_vblank, diff); |
| } |
| |
| DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", |
| crtc, diff); |
| |
| atomic_add(diff, &dev->_vblank_count[crtc]); |
| } |
| |
| /** |
| * drm_vblank_get - get a reference count on vblank events |
| * @dev: DRM device |
| * @crtc: which CRTC to own |
| * |
| * Acquire a reference count on vblank events to avoid having them disabled |
| * while in use. |
| * |
| * RETURNS |
| * Zero on success, nonzero on failure. |
| */ |
| int drm_vblank_get(struct drm_device *dev, int crtc) |
| { |
| unsigned long irqflags; |
| int ret = 0; |
| |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| /* Going from 0->1 means we have to enable interrupts again */ |
| if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && |
| !dev->vblank_enabled[crtc]) { |
| ret = dev->driver->enable_vblank(dev, crtc); |
| DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); |
| if (ret) |
| atomic_dec(&dev->vblank_refcount[crtc]); |
| else { |
| dev->vblank_enabled[crtc] = 1; |
| drm_update_vblank_count(dev, crtc); |
| } |
| } |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_vblank_get); |
| |
| /** |
| * drm_vblank_put - give up ownership of vblank events |
| * @dev: DRM device |
| * @crtc: which counter to give up |
| * |
| * Release ownership of a given vblank counter, turning off interrupts |
| * if possible. |
| */ |
| void drm_vblank_put(struct drm_device *dev, int crtc) |
| { |
| /* Last user schedules interrupt disable */ |
| if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) |
| mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); |
| } |
| EXPORT_SYMBOL(drm_vblank_put); |
| |
| /** |
| * drm_vblank_pre_modeset - account for vblanks across mode sets |
| * @dev: DRM device |
| * @crtc: CRTC in question |
| * @post: post or pre mode set? |
| * |
| * Account for vblank events across mode setting events, which will likely |
| * reset the hardware frame counter. |
| */ |
| void drm_vblank_pre_modeset(struct drm_device *dev, int crtc) |
| { |
| /* |
| * To avoid all the problems that might happen if interrupts |
| * were enabled/disabled around or between these calls, we just |
| * have the kernel take a reference on the CRTC (just once though |
| * to avoid corrupting the count if multiple, mismatch calls occur), |
| * so that interrupts remain enabled in the interim. |
| */ |
| if (!dev->vblank_inmodeset[crtc]) { |
| dev->vblank_inmodeset[crtc] = 1; |
| drm_vblank_get(dev, crtc); |
| } |
| } |
| EXPORT_SYMBOL(drm_vblank_pre_modeset); |
| |
| void drm_vblank_post_modeset(struct drm_device *dev, int crtc) |
| { |
| unsigned long irqflags; |
| |
| if (dev->vblank_inmodeset[crtc]) { |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| dev->vblank_disable_allowed = 1; |
| dev->vblank_inmodeset[crtc] = 0; |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| drm_vblank_put(dev, crtc); |
| } |
| } |
| EXPORT_SYMBOL(drm_vblank_post_modeset); |
| |
| /** |
| * drm_modeset_ctl - handle vblank event counter changes across mode switch |
| * @DRM_IOCTL_ARGS: standard ioctl arguments |
| * |
| * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET |
| * ioctls around modesetting so that any lost vblank events are accounted for. |
| * |
| * Generally the counter will reset across mode sets. If interrupts are |
| * enabled around this call, we don't have to do anything since the counter |
| * will have already been incremented. |
| */ |
| int drm_modeset_ctl(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_modeset_ctl *modeset = data; |
| int crtc, ret = 0; |
| |
| /* If drm_vblank_init() hasn't been called yet, just no-op */ |
| if (!dev->num_crtcs) |
| goto out; |
| |
| crtc = modeset->crtc; |
| if (crtc >= dev->num_crtcs) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| switch (modeset->cmd) { |
| case _DRM_PRE_MODESET: |
| drm_vblank_pre_modeset(dev, crtc); |
| break; |
| case _DRM_POST_MODESET: |
| drm_vblank_post_modeset(dev, crtc); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /** |
| * Wait for VBLANK. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param data user argument, pointing to a drm_wait_vblank structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Verifies the IRQ is installed. |
| * |
| * If a signal is requested checks if this task has already scheduled the same signal |
| * for the same vblank sequence number - nothing to be done in |
| * that case. If the number of tasks waiting for the interrupt exceeds 100 the |
| * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this |
| * task. |
| * |
| * If a signal is not requested, then calls vblank_wait(). |
| */ |
| int drm_wait_vblank(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| union drm_wait_vblank *vblwait = data; |
| int ret = 0; |
| unsigned int flags, seq, crtc; |
| |
| if ((!dev->pdev->irq) || (!dev->irq_enabled)) |
| return -EINVAL; |
| |
| if (vblwait->request.type & |
| ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { |
| DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", |
| vblwait->request.type, |
| (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); |
| return -EINVAL; |
| } |
| |
| flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; |
| crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; |
| |
| if (crtc >= dev->num_crtcs) |
| return -EINVAL; |
| |
| ret = drm_vblank_get(dev, crtc); |
| if (ret) { |
| DRM_ERROR("failed to acquire vblank counter, %d\n", ret); |
| return ret; |
| } |
| seq = drm_vblank_count(dev, crtc); |
| |
| switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { |
| case _DRM_VBLANK_RELATIVE: |
| vblwait->request.sequence += seq; |
| vblwait->request.type &= ~_DRM_VBLANK_RELATIVE; |
| case _DRM_VBLANK_ABSOLUTE: |
| break; |
| default: |
| ret = -EINVAL; |
| goto done; |
| } |
| |
| if ((flags & _DRM_VBLANK_NEXTONMISS) && |
| (seq - vblwait->request.sequence) <= (1<<23)) { |
| vblwait->request.sequence = seq + 1; |
| } |
| |
| if (flags & _DRM_VBLANK_SIGNAL) { |
| unsigned long irqflags; |
| struct list_head *vbl_sigs = &dev->vbl_sigs[crtc]; |
| struct drm_vbl_sig *vbl_sig; |
| |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| |
| /* Check if this task has already scheduled the same signal |
| * for the same vblank sequence number; nothing to be done in |
| * that case |
| */ |
| list_for_each_entry(vbl_sig, vbl_sigs, head) { |
| if (vbl_sig->sequence == vblwait->request.sequence |
| && vbl_sig->info.si_signo == |
| vblwait->request.signal |
| && vbl_sig->task == current) { |
| spin_unlock_irqrestore(&dev->vbl_lock, |
| irqflags); |
| vblwait->reply.sequence = seq; |
| goto done; |
| } |
| } |
| |
| if (atomic_read(&dev->vbl_signal_pending) >= 100) { |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| ret = -EBUSY; |
| goto done; |
| } |
| |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| |
| vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig), |
| DRM_MEM_DRIVER); |
| if (!vbl_sig) { |
| ret = -ENOMEM; |
| goto done; |
| } |
| |
| /* Get a refcount on the vblank, which will be released by |
| * drm_vbl_send_signals(). |
| */ |
| ret = drm_vblank_get(dev, crtc); |
| if (ret) { |
| drm_free(vbl_sig, sizeof(struct drm_vbl_sig), |
| DRM_MEM_DRIVER); |
| goto done; |
| } |
| |
| atomic_inc(&dev->vbl_signal_pending); |
| |
| vbl_sig->sequence = vblwait->request.sequence; |
| vbl_sig->info.si_signo = vblwait->request.signal; |
| vbl_sig->task = current; |
| |
| spin_lock_irqsave(&dev->vbl_lock, irqflags); |
| |
| list_add_tail(&vbl_sig->head, vbl_sigs); |
| |
| spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
| |
| vblwait->reply.sequence = seq; |
| } else { |
| DRM_DEBUG("waiting on vblank count %d, crtc %d\n", |
| vblwait->request.sequence, crtc); |
| dev->last_vblank_wait[crtc] = vblwait->request.sequence; |
| DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, |
| (((drm_vblank_count(dev, crtc) - |
| vblwait->request.sequence) <= (1 << 23)) || |
| !dev->irq_enabled)); |
| |
| if (ret != -EINTR) { |
| struct timeval now; |
| |
| do_gettimeofday(&now); |
| |
| vblwait->reply.tval_sec = now.tv_sec; |
| vblwait->reply.tval_usec = now.tv_usec; |
| vblwait->reply.sequence = drm_vblank_count(dev, crtc); |
| DRM_DEBUG("returning %d to client\n", |
| vblwait->reply.sequence); |
| } else { |
| DRM_DEBUG("vblank wait interrupted by signal\n"); |
| } |
| } |
| |
| done: |
| drm_vblank_put(dev, crtc); |
| return ret; |
| } |
| |
| /** |
| * Send the VBLANK signals. |
| * |
| * \param dev DRM device. |
| * \param crtc CRTC where the vblank event occurred |
| * |
| * Sends a signal for each task in drm_device::vbl_sigs and empties the list. |
| * |
| * If a signal is not requested, then calls vblank_wait(). |
| */ |
| static void drm_vbl_send_signals(struct drm_device *dev, int crtc) |
| { |
| struct drm_vbl_sig *vbl_sig, *tmp; |
| struct list_head *vbl_sigs; |
| unsigned int vbl_seq; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev->vbl_lock, flags); |
| |
| vbl_sigs = &dev->vbl_sigs[crtc]; |
| vbl_seq = drm_vblank_count(dev, crtc); |
| |
| list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) { |
| if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { |
| vbl_sig->info.si_code = vbl_seq; |
| send_sig_info(vbl_sig->info.si_signo, |
| &vbl_sig->info, vbl_sig->task); |
| |
| list_del(&vbl_sig->head); |
| |
| drm_free(vbl_sig, sizeof(*vbl_sig), |
| DRM_MEM_DRIVER); |
| atomic_dec(&dev->vbl_signal_pending); |
| drm_vblank_put(dev, crtc); |
| } |
| } |
| |
| spin_unlock_irqrestore(&dev->vbl_lock, flags); |
| } |
| |
| /** |
| * drm_handle_vblank - handle a vblank event |
| * @dev: DRM device |
| * @crtc: where this event occurred |
| * |
| * Drivers should call this routine in their vblank interrupt handlers to |
| * update the vblank counter and send any signals that may be pending. |
| */ |
| void drm_handle_vblank(struct drm_device *dev, int crtc) |
| { |
| atomic_inc(&dev->_vblank_count[crtc]); |
| DRM_WAKEUP(&dev->vbl_queue[crtc]); |
| drm_vbl_send_signals(dev, crtc); |
| } |
| EXPORT_SYMBOL(drm_handle_vblank); |