2005-04-16 16:20:36 -06:00
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/**
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2005-09-24 22:28:13 -06:00
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* \file drm_irq.c
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2005-04-16 16:20:36 -06:00
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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 <linux/interrupt.h> /* For task queue support */
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/**
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* Get interrupt from bus id.
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2005-09-24 22:28:13 -06:00
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*
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2005-04-16 16:20:36 -06:00
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* \param inode device inode.
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2007-08-25 04:23:09 -06:00
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* \param file_priv DRM file private.
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2005-04-16 16:20:36 -06:00
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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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2005-09-24 22:28:13 -06:00
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*
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2005-04-16 16:20:36 -06:00
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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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2007-09-02 20:06:45 -06:00
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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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2005-04-16 16:20:36 -06:00
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{
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2007-09-02 20:06:45 -06:00
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struct drm_irq_busid *p = data;
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2005-04-16 16:20:36 -06:00
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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2007-09-02 20:06:45 -06:00
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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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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2008-07-29 13:10:39 -06:00
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p->irq = dev->pdev->irq;
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2007-09-02 20:06:45 -06:00
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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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2005-04-16 16:20:36 -06:00
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return 0;
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}
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2008-09-30 13:14:26 -06:00
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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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2008-11-18 10:30:25 -07:00
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void drm_vblank_cleanup(struct drm_device *dev)
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2008-09-30 13:14:26 -06:00
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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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drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs,
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DRM_MEM_DRIVER);
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drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs,
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DRM_MEM_DRIVER);
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drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) *
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dev->num_crtcs, DRM_MEM_DRIVER);
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drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) *
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dev->num_crtcs, DRM_MEM_DRIVER);
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drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) *
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dev->num_crtcs, DRM_MEM_DRIVER);
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drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs,
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DRM_MEM_DRIVER);
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drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) *
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dev->num_crtcs, DRM_MEM_DRIVER);
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dev->num_crtcs = 0;
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}
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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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atomic_set(&dev->vbl_signal_pending, 0);
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dev->num_crtcs = num_crtcs;
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dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs,
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DRM_MEM_DRIVER);
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if (!dev->vbl_queue)
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goto err;
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dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs,
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DRM_MEM_DRIVER);
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if (!dev->vbl_sigs)
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goto err;
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dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs,
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DRM_MEM_DRIVER);
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if (!dev->_vblank_count)
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goto err;
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dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs,
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DRM_MEM_DRIVER);
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if (!dev->vblank_refcount)
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goto err;
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dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int),
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DRM_MEM_DRIVER);
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if (!dev->vblank_enabled)
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goto err;
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dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER);
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if (!dev->last_vblank)
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goto err;
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dev->vblank_inmodeset = drm_calloc(num_crtcs, sizeof(int),
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DRM_MEM_DRIVER);
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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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INIT_LIST_HEAD(&dev->vbl_sigs[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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2005-04-16 16:20:36 -06:00
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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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*
|
2008-09-30 13:14:26 -06:00
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* Initializes the IRQ related data. Installs the handler, calling the driver
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2005-04-16 16:20:36 -06:00
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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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2008-09-30 13:14:26 -06:00
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int drm_irq_install(struct drm_device *dev)
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2005-04-16 16:20:36 -06:00
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{
|
2008-09-30 13:14:26 -06:00
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int ret = 0;
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2005-09-24 22:28:13 -06:00
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unsigned long sh_flags = 0;
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2005-04-16 16:20:36 -06:00
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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|
2008-07-29 13:10:39 -06:00
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if (dev->pdev->irq == 0)
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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2006-02-02 01:37:46 -07:00
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mutex_lock(&dev->struct_mutex);
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2005-04-16 16:20:36 -06:00
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/* Driver must have been initialized */
|
2005-09-24 22:28:13 -06:00
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if (!dev->dev_private) {
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2006-02-02 01:37:46 -07:00
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mutex_unlock(&dev->struct_mutex);
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2005-04-16 16:20:36 -06:00
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return -EINVAL;
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}
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2005-09-24 22:28:13 -06:00
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if (dev->irq_enabled) {
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2006-02-02 01:37:46 -07:00
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mutex_unlock(&dev->struct_mutex);
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2005-04-16 16:20:36 -06:00
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return -EBUSY;
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}
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dev->irq_enabled = 1;
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2006-02-02 01:37:46 -07:00
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mutex_unlock(&dev->struct_mutex);
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2005-04-16 16:20:36 -06:00
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2008-07-29 13:10:39 -06:00
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DRM_DEBUG("irq=%d\n", dev->pdev->irq);
|
2005-04-16 16:20:36 -06:00
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2005-09-24 22:28:13 -06:00
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/* Before installing handler */
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2005-04-16 16:20:36 -06:00
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dev->driver->irq_preinstall(dev);
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2005-09-24 22:28:13 -06:00
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/* Install handler */
|
2005-04-16 16:20:36 -06:00
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if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
|
2006-07-01 20:29:34 -06:00
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sh_flags = IRQF_SHARED;
|
2005-09-24 22:28:13 -06:00
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|
2008-09-15 16:00:33 -06:00
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ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
|
2005-09-24 22:28:13 -06:00
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sh_flags, dev->devname, dev);
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2008-09-15 16:00:33 -06:00
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2005-09-24 22:28:13 -06:00
|
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if (ret < 0) {
|
2006-02-02 01:37:46 -07:00
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mutex_lock(&dev->struct_mutex);
|
2005-04-16 16:20:36 -06:00
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dev->irq_enabled = 0;
|
2006-02-02 01:37:46 -07:00
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mutex_unlock(&dev->struct_mutex);
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2005-04-16 16:20:36 -06:00
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return ret;
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}
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2005-09-24 22:28:13 -06:00
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/* After installing handler */
|
2008-09-30 13:14:26 -06:00
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ret = dev->driver->irq_postinstall(dev);
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|
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if (ret < 0) {
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mutex_lock(&dev->struct_mutex);
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|
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dev->irq_enabled = 0;
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|
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mutex_unlock(&dev->struct_mutex);
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}
|
2005-04-16 16:20:36 -06:00
|
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2008-09-30 13:14:26 -06:00
|
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return ret;
|
2005-04-16 16:20:36 -06:00
|
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|
}
|
2008-09-30 13:14:26 -06:00
|
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EXPORT_SYMBOL(drm_irq_install);
|
2005-04-16 16:20:36 -06:00
|
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|
|
|
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/**
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|
|
|
* Uninstall the IRQ handler.
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*
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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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|
|
|
*/
|
2007-07-10 23:53:27 -06:00
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int drm_irq_uninstall(struct drm_device * dev)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
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|
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int irq_enabled;
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|
|
|
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
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|
|
return -EINVAL;
|
|
|
|
|
2006-02-02 01:37:46 -07:00
|
|
|
mutex_lock(&dev->struct_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
irq_enabled = dev->irq_enabled;
|
|
|
|
dev->irq_enabled = 0;
|
2006-02-02 01:37:46 -07:00
|
|
|
mutex_unlock(&dev->struct_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
if (!irq_enabled)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-07-29 13:10:39 -06:00
|
|
|
DRM_DEBUG("irq=%d\n", dev->pdev->irq);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
dev->driver->irq_uninstall(dev);
|
|
|
|
|
2008-07-29 13:10:39 -06:00
|
|
|
free_irq(dev->pdev->irq, dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_irq_uninstall);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* IRQ control ioctl.
|
|
|
|
*
|
|
|
|
* \param inode device inode.
|
2007-08-25 04:23:09 -06:00
|
|
|
* \param file_priv DRM file private.
|
2005-04-16 16:20:36 -06:00
|
|
|
* \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.
|
|
|
|
*/
|
2007-09-02 20:06:45 -06:00
|
|
|
int drm_control(struct drm_device *dev, void *data,
|
|
|
|
struct drm_file *file_priv)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-09-02 20:06:45 -06:00
|
|
|
struct drm_control *ctl = data;
|
2005-09-24 22:28:13 -06:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
|
|
|
|
|
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
switch (ctl->func) {
|
2005-04-16 16:20:36 -06:00
|
|
|
case DRM_INST_HANDLER:
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
|
|
|
return 0;
|
|
|
|
if (dev->if_version < DRM_IF_VERSION(1, 2) &&
|
2008-07-29 13:10:39 -06:00
|
|
|
ctl->irq != dev->pdev->irq)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EINVAL;
|
2005-09-24 22:28:13 -06:00
|
|
|
return drm_irq_install(dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
case DRM_UNINST_HANDLER:
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
|
|
|
|
return 0;
|
2005-09-24 22:28:13 -06:00
|
|
|
return drm_irq_uninstall(dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
/**
|
|
|
|
* 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_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;
|
|
|
|
unsigned long irqflags;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
switch (modeset->cmd) {
|
|
|
|
case _DRM_PRE_MODESET:
|
|
|
|
if (!dev->vblank_inmodeset[crtc]) {
|
|
|
|
dev->vblank_inmodeset[crtc] = 1;
|
|
|
|
drm_vblank_get(dev, crtc);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case _DRM_POST_MODESET:
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/**
|
|
|
|
* Wait for VBLANK.
|
|
|
|
*
|
|
|
|
* \param inode device inode.
|
2007-08-25 04:23:09 -06:00
|
|
|
* \param file_priv DRM file private.
|
2005-04-16 16:20:36 -06:00
|
|
|
* \param cmd command.
|
|
|
|
* \param data user argument, pointing to a drm_wait_vblank structure.
|
|
|
|
* \return zero on success or a negative number on failure.
|
|
|
|
*
|
2005-09-24 22:28:13 -06:00
|
|
|
* Verifies the IRQ is installed.
|
2005-04-16 16:20:36 -06:00
|
|
|
*
|
|
|
|
* 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().
|
|
|
|
*/
|
2008-09-30 13:14:26 -06:00
|
|
|
int drm_wait_vblank(struct drm_device *dev, void *data,
|
|
|
|
struct drm_file *file_priv)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-09-02 20:06:45 -06:00
|
|
|
union drm_wait_vblank *vblwait = data;
|
2005-04-16 16:20:36 -06:00
|
|
|
int ret = 0;
|
2008-09-30 13:14:26 -06:00
|
|
|
unsigned int flags, seq, crtc;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-07-29 13:10:39 -06:00
|
|
|
if ((!dev->pdev->irq) || (!dev->irq_enabled))
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
if (vblwait->request.type &
|
2006-10-24 06:24:38 -06:00
|
|
|
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
|
|
|
|
DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
|
2007-09-02 20:06:45 -06:00
|
|
|
vblwait->request.type,
|
2006-10-24 06:24:38 -06:00
|
|
|
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
|
2008-09-30 13:14:26 -06:00
|
|
|
crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
|
2006-10-24 06:24:38 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
if (crtc >= dev->num_crtcs)
|
2006-10-24 06:24:38 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
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);
|
2006-10-24 06:24:38 -06:00
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
|
2005-04-16 16:20:36 -06:00
|
|
|
case _DRM_VBLANK_RELATIVE:
|
2007-09-02 20:06:45 -06:00
|
|
|
vblwait->request.sequence += seq;
|
|
|
|
vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
|
2005-04-16 16:20:36 -06:00
|
|
|
case _DRM_VBLANK_ABSOLUTE:
|
|
|
|
break;
|
|
|
|
default:
|
2008-09-30 13:14:26 -06:00
|
|
|
ret = -EINVAL;
|
|
|
|
goto done;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2006-10-24 07:34:18 -06:00
|
|
|
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
|
2007-09-02 20:06:45 -06:00
|
|
|
(seq - vblwait->request.sequence) <= (1<<23)) {
|
|
|
|
vblwait->request.sequence = seq + 1;
|
2006-10-24 07:34:18 -06:00
|
|
|
}
|
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
if (flags & _DRM_VBLANK_SIGNAL) {
|
2005-04-16 16:20:36 -06:00
|
|
|
unsigned long irqflags;
|
2008-09-30 13:14:26 -06:00
|
|
|
struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
|
2007-07-11 00:53:40 -06:00
|
|
|
struct drm_vbl_sig *vbl_sig;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Check if this task has already scheduled the same signal
|
|
|
|
* for the same vblank sequence number; nothing to be done in
|
|
|
|
* that case
|
|
|
|
*/
|
2007-05-25 13:01:51 -06:00
|
|
|
list_for_each_entry(vbl_sig, vbl_sigs, head) {
|
2007-09-02 20:06:45 -06:00
|
|
|
if (vbl_sig->sequence == vblwait->request.sequence
|
|
|
|
&& vbl_sig->info.si_signo ==
|
|
|
|
vblwait->request.signal
|
2005-09-24 22:28:13 -06:00
|
|
|
&& vbl_sig->task == current) {
|
|
|
|
spin_unlock_irqrestore(&dev->vbl_lock,
|
|
|
|
irqflags);
|
2007-09-02 20:06:45 -06:00
|
|
|
vblwait->reply.sequence = seq;
|
2005-04-16 16:20:36 -06:00
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
if (atomic_read(&dev->vbl_signal_pending) >= 100) {
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
2008-09-30 13:14:26 -06:00
|
|
|
ret = -EBUSY;
|
|
|
|
goto done;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
|
|
|
|
DRM_MEM_DRIVER);
|
|
|
|
if (!vbl_sig) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
2008-10-17 12:03:53 -06:00
|
|
|
/* Get a refcount on the vblank, which will be released by
|
|
|
|
* drm_vbl_send_signals().
|
|
|
|
*/
|
2008-09-30 13:14:26 -06:00
|
|
|
ret = drm_vblank_get(dev, crtc);
|
|
|
|
if (ret) {
|
|
|
|
drm_free(vbl_sig, sizeof(struct drm_vbl_sig),
|
|
|
|
DRM_MEM_DRIVER);
|
2008-10-17 12:03:53 -06:00
|
|
|
goto done;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
atomic_inc(&dev->vbl_signal_pending);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
vbl_sig->sequence = vblwait->request.sequence;
|
|
|
|
vbl_sig->info.si_signo = vblwait->request.signal;
|
2005-04-16 16:20:36 -06:00
|
|
|
vbl_sig->task = current;
|
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-05-25 13:01:51 -06:00
|
|
|
list_add_tail(&vbl_sig->head, vbl_sigs);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
2006-10-24 07:34:58 -06:00
|
|
|
|
2007-09-02 20:06:45 -06:00
|
|
|
vblwait->reply.sequence = seq;
|
2005-04-16 16:20:36 -06:00
|
|
|
} else {
|
2008-09-30 13:14:26 -06:00
|
|
|
DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
|
|
|
|
vblwait->request.sequence, crtc);
|
|
|
|
DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
|
|
|
|
((drm_vblank_count(dev, crtc)
|
|
|
|
- vblwait->request.sequence) <= (1 << 23)));
|
|
|
|
|
|
|
|
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");
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
done:
|
|
|
|
drm_vblank_put(dev, crtc);
|
2005-04-16 16:20:36 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Send the VBLANK signals.
|
|
|
|
*
|
|
|
|
* \param dev DRM device.
|
2008-09-30 13:14:26 -06:00
|
|
|
* \param crtc CRTC where the vblank event occurred
|
2005-04-16 16:20:36 -06:00
|
|
|
*
|
|
|
|
* 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().
|
|
|
|
*/
|
2008-09-30 13:14:26 -06:00
|
|
|
static void drm_vbl_send_signals(struct drm_device *dev, int crtc)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-09-30 13:14:26 -06:00
|
|
|
struct drm_vbl_sig *vbl_sig, *tmp;
|
|
|
|
struct list_head *vbl_sigs;
|
|
|
|
unsigned int vbl_seq;
|
2005-04-16 16:20:36 -06:00
|
|
|
unsigned long flags;
|
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_lock_irqsave(&dev->vbl_lock, flags);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
vbl_sigs = &dev->vbl_sigs[crtc];
|
|
|
|
vbl_seq = drm_vblank_count(dev, crtc);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
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);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
list_del(&vbl_sig->head);
|
2008-05-06 20:15:39 -06:00
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
drm_free(vbl_sig, sizeof(*vbl_sig),
|
|
|
|
DRM_MEM_DRIVER);
|
|
|
|
atomic_dec(&dev->vbl_signal_pending);
|
|
|
|
drm_vblank_put(dev, crtc);
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2005-09-24 22:28:13 -06:00
|
|
|
spin_unlock_irqrestore(&dev->vbl_lock, flags);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-09-30 13:14:26 -06:00
|
|
|
/**
|
|
|
|
* 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);
|