![Chris Wilson](/assets/img/avatar_default.png)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Kristian Høgsberg <krh@bitplanet.net> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
800 lines
21 KiB
C
800 lines
21 KiB
C
/**
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* \file drm_irq.c
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* IRQ support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#include "drm_trace.h"
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/slab.h>
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#include <linux/vgaarb.h>
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/**
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* Get interrupt from bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_irq_busid structure.
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* \return zero on success or a negative number on failure.
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*
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* Finds the PCI device with the specified bus id and gets its IRQ number.
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* This IOCTL is deprecated, and will now return EINVAL for any busid not equal
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* to that of the device that this DRM instance attached to.
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*/
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int drm_irq_by_busid(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_irq_busid *p = data;
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if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
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return -EINVAL;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
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(p->busnum & 0xff) != dev->pdev->bus->number ||
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p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
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return -EINVAL;
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p->irq = dev->pdev->irq;
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DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
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p->irq);
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return 0;
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}
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static void vblank_disable_fn(unsigned long arg)
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{
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struct drm_device *dev = (struct drm_device *)arg;
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unsigned long irqflags;
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int i;
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if (!dev->vblank_disable_allowed)
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return;
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for (i = 0; i < dev->num_crtcs; i++) {
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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if (atomic_read(&dev->vblank_refcount[i]) == 0 &&
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dev->vblank_enabled[i]) {
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DRM_DEBUG("disabling vblank on crtc %d\n", i);
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dev->last_vblank[i] =
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dev->driver->get_vblank_counter(dev, i);
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dev->driver->disable_vblank(dev, i);
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dev->vblank_enabled[i] = 0;
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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}
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}
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void drm_vblank_cleanup(struct drm_device *dev)
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{
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/* Bail if the driver didn't call drm_vblank_init() */
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if (dev->num_crtcs == 0)
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return;
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del_timer(&dev->vblank_disable_timer);
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vblank_disable_fn((unsigned long)dev);
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kfree(dev->vbl_queue);
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kfree(dev->_vblank_count);
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kfree(dev->vblank_refcount);
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kfree(dev->vblank_enabled);
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kfree(dev->last_vblank);
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kfree(dev->last_vblank_wait);
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kfree(dev->vblank_inmodeset);
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dev->num_crtcs = 0;
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}
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EXPORT_SYMBOL(drm_vblank_cleanup);
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int drm_vblank_init(struct drm_device *dev, int num_crtcs)
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{
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int i, ret = -ENOMEM;
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setup_timer(&dev->vblank_disable_timer, vblank_disable_fn,
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(unsigned long)dev);
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spin_lock_init(&dev->vbl_lock);
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dev->num_crtcs = num_crtcs;
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dev->vbl_queue = kmalloc(sizeof(wait_queue_head_t) * num_crtcs,
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GFP_KERNEL);
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if (!dev->vbl_queue)
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goto err;
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dev->_vblank_count = kmalloc(sizeof(atomic_t) * num_crtcs, GFP_KERNEL);
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if (!dev->_vblank_count)
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goto err;
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dev->vblank_refcount = kmalloc(sizeof(atomic_t) * num_crtcs,
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GFP_KERNEL);
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if (!dev->vblank_refcount)
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goto err;
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dev->vblank_enabled = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
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if (!dev->vblank_enabled)
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goto err;
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dev->last_vblank = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
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if (!dev->last_vblank)
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goto err;
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dev->last_vblank_wait = kcalloc(num_crtcs, sizeof(u32), GFP_KERNEL);
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if (!dev->last_vblank_wait)
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goto err;
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dev->vblank_inmodeset = kcalloc(num_crtcs, sizeof(int), GFP_KERNEL);
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if (!dev->vblank_inmodeset)
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goto err;
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/* Zero per-crtc vblank stuff */
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for (i = 0; i < num_crtcs; i++) {
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init_waitqueue_head(&dev->vbl_queue[i]);
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atomic_set(&dev->_vblank_count[i], 0);
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atomic_set(&dev->vblank_refcount[i], 0);
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}
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dev->vblank_disable_allowed = 0;
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return 0;
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err:
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drm_vblank_cleanup(dev);
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return ret;
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}
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EXPORT_SYMBOL(drm_vblank_init);
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static void drm_irq_vgaarb_nokms(void *cookie, bool state)
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{
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struct drm_device *dev = cookie;
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if (dev->driver->vgaarb_irq) {
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dev->driver->vgaarb_irq(dev, state);
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return;
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}
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if (!dev->irq_enabled)
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return;
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if (state)
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dev->driver->irq_uninstall(dev);
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else {
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dev->driver->irq_preinstall(dev);
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dev->driver->irq_postinstall(dev);
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}
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}
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/**
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* Install IRQ handler.
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*
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* \param dev DRM device.
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions
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* before and after the installation.
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*/
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int drm_irq_install(struct drm_device *dev)
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{
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int ret = 0;
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unsigned long sh_flags = 0;
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char *irqname;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if (drm_dev_to_irq(dev) == 0)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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/* Driver must have been initialized */
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if (!dev->dev_private) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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if (dev->irq_enabled) {
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mutex_unlock(&dev->struct_mutex);
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return -EBUSY;
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}
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dev->irq_enabled = 1;
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mutex_unlock(&dev->struct_mutex);
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DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
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/* Before installing handler */
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dev->driver->irq_preinstall(dev);
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/* Install handler */
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if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
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sh_flags = IRQF_SHARED;
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if (dev->devname)
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irqname = dev->devname;
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else
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irqname = dev->driver->name;
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ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
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sh_flags, irqname, dev);
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if (ret < 0) {
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mutex_lock(&dev->struct_mutex);
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dev->irq_enabled = 0;
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
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/* After installing handler */
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ret = dev->driver->irq_postinstall(dev);
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if (ret < 0) {
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mutex_lock(&dev->struct_mutex);
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dev->irq_enabled = 0;
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mutex_unlock(&dev->struct_mutex);
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}
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return ret;
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}
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EXPORT_SYMBOL(drm_irq_install);
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/**
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* Uninstall the IRQ handler.
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*
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* \param dev DRM device.
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*
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* Calls the driver's \c drm_driver_irq_uninstall() function, and stops the irq.
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*/
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int drm_irq_uninstall(struct drm_device * dev)
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{
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unsigned long irqflags;
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int irq_enabled, i;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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irq_enabled = dev->irq_enabled;
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dev->irq_enabled = 0;
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mutex_unlock(&dev->struct_mutex);
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/*
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* Wake up any waiters so they don't hang.
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*/
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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for (i = 0; i < dev->num_crtcs; i++) {
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DRM_WAKEUP(&dev->vbl_queue[i]);
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dev->vblank_enabled[i] = 0;
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dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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if (!irq_enabled)
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return -EINVAL;
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DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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vga_client_register(dev->pdev, NULL, NULL, NULL);
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dev->driver->irq_uninstall(dev);
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free_irq(drm_dev_to_irq(dev), dev);
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return 0;
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}
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EXPORT_SYMBOL(drm_irq_uninstall);
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/**
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* IRQ control ioctl.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_control structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls irq_install() or irq_uninstall() according to \p arg.
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*/
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int drm_control(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_control *ctl = data;
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/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
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switch (ctl->func) {
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case DRM_INST_HANDLER:
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return 0;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return 0;
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if (dev->if_version < DRM_IF_VERSION(1, 2) &&
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ctl->irq != drm_dev_to_irq(dev))
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return -EINVAL;
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return drm_irq_install(dev);
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case DRM_UNINST_HANDLER:
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return 0;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return 0;
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return drm_irq_uninstall(dev);
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default:
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return -EINVAL;
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}
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}
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/**
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* drm_vblank_count - retrieve "cooked" vblank counter value
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* @dev: DRM device
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* @crtc: which counter to retrieve
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*
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* Fetches the "cooked" vblank count value that represents the number of
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* vblank events since the system was booted, including lost events due to
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* modesetting activity.
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*/
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u32 drm_vblank_count(struct drm_device *dev, int crtc)
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{
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return atomic_read(&dev->_vblank_count[crtc]);
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}
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EXPORT_SYMBOL(drm_vblank_count);
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/**
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* drm_update_vblank_count - update the master vblank counter
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* @dev: DRM device
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* @crtc: counter to update
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*
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* Call back into the driver to update the appropriate vblank counter
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* (specified by @crtc). Deal with wraparound, if it occurred, and
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* update the last read value so we can deal with wraparound on the next
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* call if necessary.
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*
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* Only necessary when going from off->on, to account for frames we
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* didn't get an interrupt for.
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*
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* Note: caller must hold dev->vbl_lock since this reads & writes
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* device vblank fields.
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*/
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static void drm_update_vblank_count(struct drm_device *dev, int crtc)
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{
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u32 cur_vblank, diff;
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/*
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* Interrupts were disabled prior to this call, so deal with counter
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* wrap if needed.
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* NOTE! It's possible we lost a full dev->max_vblank_count events
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* here if the register is small or we had vblank interrupts off for
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* a long time.
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*/
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cur_vblank = dev->driver->get_vblank_counter(dev, crtc);
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diff = cur_vblank - dev->last_vblank[crtc];
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if (cur_vblank < dev->last_vblank[crtc]) {
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diff += dev->max_vblank_count;
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DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
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crtc, dev->last_vblank[crtc], cur_vblank, diff);
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}
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DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n",
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crtc, diff);
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atomic_add(diff, &dev->_vblank_count[crtc]);
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}
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/**
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* drm_vblank_get - get a reference count on vblank events
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* @dev: DRM device
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* @crtc: which CRTC to own
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*
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* Acquire a reference count on vblank events to avoid having them disabled
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* while in use.
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*
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* RETURNS
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* Zero on success, nonzero on failure.
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*/
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int drm_vblank_get(struct drm_device *dev, int crtc)
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{
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unsigned long irqflags;
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int ret = 0;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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/* Going from 0->1 means we have to enable interrupts again */
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if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
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if (!dev->vblank_enabled[crtc]) {
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ret = dev->driver->enable_vblank(dev, crtc);
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DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret);
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if (ret)
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atomic_dec(&dev->vblank_refcount[crtc]);
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else {
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dev->vblank_enabled[crtc] = 1;
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drm_update_vblank_count(dev, crtc);
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}
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}
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} else {
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if (!dev->vblank_enabled[crtc]) {
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atomic_dec(&dev->vblank_refcount[crtc]);
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ret = -EINVAL;
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}
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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return ret;
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}
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EXPORT_SYMBOL(drm_vblank_get);
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/**
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* drm_vblank_put - give up ownership of vblank events
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* @dev: DRM device
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* @crtc: which counter to give up
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*
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* Release ownership of a given vblank counter, turning off interrupts
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* if possible.
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*/
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void drm_vblank_put(struct drm_device *dev, int crtc)
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{
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BUG_ON (atomic_read (&dev->vblank_refcount[crtc]) == 0);
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/* Last user schedules interrupt disable */
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if (atomic_dec_and_test(&dev->vblank_refcount[crtc]))
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mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ);
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}
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EXPORT_SYMBOL(drm_vblank_put);
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void drm_vblank_off(struct drm_device *dev, int crtc)
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{
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unsigned long irqflags;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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dev->driver->disable_vblank(dev, crtc);
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DRM_WAKEUP(&dev->vbl_queue[crtc]);
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dev->vblank_enabled[crtc] = 0;
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dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc);
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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}
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EXPORT_SYMBOL(drm_vblank_off);
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/**
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* drm_vblank_pre_modeset - account for vblanks across mode sets
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* @dev: DRM device
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* @crtc: CRTC in question
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* @post: post or pre mode set?
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*
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* Account for vblank events across mode setting events, which will likely
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* reset the hardware frame counter.
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*/
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void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
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{
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/* vblank is not initialized (IRQ not installed ?) */
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if (!dev->num_crtcs)
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return;
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/*
|
|
* 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] = 0x1;
|
|
if (drm_vblank_get(dev, crtc) == 0)
|
|
dev->vblank_inmodeset[crtc] |= 0x2;
|
|
}
|
|
}
|
|
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;
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
if (dev->vblank_inmodeset[crtc] & 0x2)
|
|
drm_vblank_put(dev, crtc);
|
|
|
|
dev->vblank_inmodeset[crtc] = 0;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
static int drm_queue_vblank_event(struct drm_device *dev, int pipe,
|
|
union drm_wait_vblank *vblwait,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_pending_vblank_event *e;
|
|
struct timeval now;
|
|
unsigned long flags;
|
|
unsigned int seq;
|
|
int ret;
|
|
|
|
e = kzalloc(sizeof *e, GFP_KERNEL);
|
|
if (e == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_put;
|
|
}
|
|
|
|
e->pipe = pipe;
|
|
e->base.pid = current->pid;
|
|
e->event.base.type = DRM_EVENT_VBLANK;
|
|
e->event.base.length = sizeof e->event;
|
|
e->event.user_data = vblwait->request.signal;
|
|
e->base.event = &e->event.base;
|
|
e->base.file_priv = file_priv;
|
|
e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
|
|
|
|
do_gettimeofday(&now);
|
|
spin_lock_irqsave(&dev->event_lock, flags);
|
|
|
|
if (file_priv->event_space < sizeof e->event) {
|
|
ret = -EBUSY;
|
|
goto err_unlock;
|
|
}
|
|
|
|
file_priv->event_space -= sizeof e->event;
|
|
seq = drm_vblank_count(dev, pipe);
|
|
if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
|
|
(seq - vblwait->request.sequence) <= (1 << 23)) {
|
|
vblwait->request.sequence = seq + 1;
|
|
vblwait->reply.sequence = vblwait->request.sequence;
|
|
}
|
|
|
|
DRM_DEBUG("event on vblank count %d, current %d, crtc %d\n",
|
|
vblwait->request.sequence, seq, pipe);
|
|
|
|
trace_drm_vblank_event_queued(current->pid, pipe,
|
|
vblwait->request.sequence);
|
|
|
|
e->event.sequence = vblwait->request.sequence;
|
|
if ((seq - vblwait->request.sequence) <= (1 << 23)) {
|
|
e->event.tv_sec = now.tv_sec;
|
|
e->event.tv_usec = now.tv_usec;
|
|
drm_vblank_put(dev, e->pipe);
|
|
list_add_tail(&e->base.link, &e->base.file_priv->event_list);
|
|
wake_up_interruptible(&e->base.file_priv->event_wait);
|
|
trace_drm_vblank_event_delivered(current->pid, pipe,
|
|
vblwait->request.sequence);
|
|
} else {
|
|
list_add_tail(&e->base.link, &dev->vblank_event_list);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
|
|
return 0;
|
|
|
|
err_unlock:
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
kfree(e);
|
|
err_put:
|
|
drm_vblank_put(dev, e->pipe);
|
|
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.
|
|
*
|
|
* This function enables the vblank interrupt on the pipe requested, then
|
|
* sleeps waiting for the requested sequence number to occur, and drops
|
|
* the vblank interrupt refcount afterwards. (vblank irq disable follows that
|
|
* after a timeout with no further vblank waits scheduled).
|
|
*/
|
|
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 ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
|
|
return -EINVAL;
|
|
|
|
if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
|
|
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_DEBUG("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_EVENT)
|
|
return drm_queue_vblank_event(dev, crtc, vblwait, file_priv);
|
|
|
|
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
|
|
(seq - vblwait->request.sequence) <= (1<<23)) {
|
|
vblwait->request.sequence = seq + 1;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void drm_handle_vblank_events(struct drm_device *dev, int crtc)
|
|
{
|
|
struct drm_pending_vblank_event *e, *t;
|
|
struct timeval now;
|
|
unsigned long flags;
|
|
unsigned int seq;
|
|
|
|
do_gettimeofday(&now);
|
|
seq = drm_vblank_count(dev, crtc);
|
|
|
|
spin_lock_irqsave(&dev->event_lock, flags);
|
|
|
|
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
|
|
if (e->pipe != crtc)
|
|
continue;
|
|
if ((seq - e->event.sequence) > (1<<23))
|
|
continue;
|
|
|
|
DRM_DEBUG("vblank event on %d, current %d\n",
|
|
e->event.sequence, seq);
|
|
|
|
e->event.sequence = seq;
|
|
e->event.tv_sec = now.tv_sec;
|
|
e->event.tv_usec = now.tv_usec;
|
|
drm_vblank_put(dev, e->pipe);
|
|
list_move_tail(&e->base.link, &e->base.file_priv->event_list);
|
|
wake_up_interruptible(&e->base.file_priv->event_wait);
|
|
trace_drm_vblank_event_delivered(e->base.pid, e->pipe,
|
|
e->event.sequence);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
|
|
trace_drm_vblank_event(crtc, seq);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
atomic_inc(&dev->_vblank_count[crtc]);
|
|
DRM_WAKEUP(&dev->vbl_queue[crtc]);
|
|
drm_handle_vblank_events(dev, crtc);
|
|
}
|
|
EXPORT_SYMBOL(drm_handle_vblank);
|