af6061af0d
This reverts commit ac741ab71b
.
Okay this looks like wasn't as fully baked as I'd led myself to believe.
Revert for now for further baking.
Signed-off-by: Dave Airlie <airlied@redhat.com>
463 lines
12 KiB
C
463 lines
12 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 <linux/interrupt.h> /* For task queue support */
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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_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->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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/**
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* Install IRQ handler.
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*
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* \param dev DRM device.
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* \param irq IRQ number.
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*
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* Initializes the IRQ related data, and setups drm_device::vbl_queue. 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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static int drm_irq_install(struct drm_device * dev)
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{
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int ret;
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unsigned long sh_flags = 0;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if (dev->irq == 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", dev->irq);
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if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
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init_waitqueue_head(&dev->vbl_queue);
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spin_lock_init(&dev->vbl_lock);
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INIT_LIST_HEAD(&dev->vbl_sigs);
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INIT_LIST_HEAD(&dev->vbl_sigs2);
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dev->vbl_pending = 0;
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}
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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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ret = request_irq(dev->irq, dev->driver->irq_handler,
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sh_flags, dev->devname, 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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/* After installing handler */
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dev->driver->irq_postinstall(dev);
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return 0;
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}
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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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int irq_enabled;
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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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if (!irq_enabled)
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return -EINVAL;
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DRM_DEBUG("irq=%d\n", dev->irq);
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dev->driver->irq_uninstall(dev);
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free_irq(dev->irq, dev);
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dev->locked_tasklet_func = NULL;
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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 (dev->if_version < DRM_IF_VERSION(1, 2) &&
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ctl->irq != dev->irq)
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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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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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* Wait for VBLANK.
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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 data user argument, pointing to a drm_wait_vblank structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the IRQ is installed.
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*
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* If a signal is requested checks if this task has already scheduled the same signal
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* for the same vblank sequence number - nothing to be done in
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* that case. If the number of tasks waiting for the interrupt exceeds 100 the
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* function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
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* task.
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*
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* If a signal is not requested, then calls vblank_wait().
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*/
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int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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union drm_wait_vblank *vblwait = data;
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struct timeval now;
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int ret = 0;
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unsigned int flags, seq;
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if ((!dev->irq) || (!dev->irq_enabled))
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return -EINVAL;
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if (vblwait->request.type &
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~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) {
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DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
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vblwait->request.type,
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(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK));
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return -EINVAL;
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}
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flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
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if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ?
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DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL))
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return -EINVAL;
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seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2
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: &dev->vbl_received);
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switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
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case _DRM_VBLANK_RELATIVE:
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vblwait->request.sequence += seq;
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vblwait->request.type &= ~_DRM_VBLANK_RELATIVE;
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case _DRM_VBLANK_ABSOLUTE:
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break;
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default:
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return -EINVAL;
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}
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if ((flags & _DRM_VBLANK_NEXTONMISS) &&
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(seq - vblwait->request.sequence) <= (1<<23)) {
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vblwait->request.sequence = seq + 1;
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}
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if (flags & _DRM_VBLANK_SIGNAL) {
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unsigned long irqflags;
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struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY)
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? &dev->vbl_sigs2 : &dev->vbl_sigs;
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struct drm_vbl_sig *vbl_sig;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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/* Check if this task has already scheduled the same signal
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* for the same vblank sequence number; nothing to be done in
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* that case
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*/
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list_for_each_entry(vbl_sig, vbl_sigs, head) {
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if (vbl_sig->sequence == vblwait->request.sequence
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&& vbl_sig->info.si_signo ==
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vblwait->request.signal
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&& vbl_sig->task == current) {
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spin_unlock_irqrestore(&dev->vbl_lock,
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irqflags);
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vblwait->reply.sequence = seq;
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goto done;
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}
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}
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if (dev->vbl_pending >= 100) {
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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return -EBUSY;
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}
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dev->vbl_pending++;
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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if (!
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(vbl_sig =
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drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) {
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return -ENOMEM;
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}
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memset((void *)vbl_sig, 0, sizeof(*vbl_sig));
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vbl_sig->sequence = vblwait->request.sequence;
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vbl_sig->info.si_signo = vblwait->request.signal;
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vbl_sig->task = current;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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list_add_tail(&vbl_sig->head, vbl_sigs);
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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vblwait->reply.sequence = seq;
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} else {
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if (flags & _DRM_VBLANK_SECONDARY) {
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if (dev->driver->vblank_wait2)
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ret = dev->driver->vblank_wait2(dev, &vblwait->request.sequence);
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} else if (dev->driver->vblank_wait)
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ret =
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dev->driver->vblank_wait(dev,
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&vblwait->request.sequence);
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do_gettimeofday(&now);
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vblwait->reply.tval_sec = now.tv_sec;
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vblwait->reply.tval_usec = now.tv_usec;
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}
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done:
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return ret;
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}
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/**
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* Send the VBLANK signals.
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*
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* \param dev DRM device.
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*
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* Sends a signal for each task in drm_device::vbl_sigs and empties the list.
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*
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* If a signal is not requested, then calls vblank_wait().
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*/
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void drm_vbl_send_signals(struct drm_device * dev)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&dev->vbl_lock, flags);
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for (i = 0; i < 2; i++) {
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struct drm_vbl_sig *vbl_sig, *tmp;
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struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs;
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unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 :
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&dev->vbl_received);
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list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) {
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if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) {
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vbl_sig->info.si_code = vbl_seq;
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send_sig_info(vbl_sig->info.si_signo,
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&vbl_sig->info, vbl_sig->task);
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list_del(&vbl_sig->head);
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drm_free(vbl_sig, sizeof(*vbl_sig),
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DRM_MEM_DRIVER);
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dev->vbl_pending--;
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}
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}
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}
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spin_unlock_irqrestore(&dev->vbl_lock, flags);
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}
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EXPORT_SYMBOL(drm_vbl_send_signals);
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/**
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* Tasklet wrapper function.
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*
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* \param data DRM device in disguise.
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*
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* Attempts to grab the HW lock and calls the driver callback on success. On
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* failure, leave the lock marked as contended so the callback can be called
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* from drm_unlock().
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*/
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static void drm_locked_tasklet_func(unsigned long data)
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{
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struct drm_device *dev = (struct drm_device *)data;
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unsigned long irqflags;
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spin_lock_irqsave(&dev->tasklet_lock, irqflags);
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if (!dev->locked_tasklet_func ||
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!drm_lock_take(&dev->lock,
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DRM_KERNEL_CONTEXT)) {
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spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
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return;
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}
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dev->lock.lock_time = jiffies;
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atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
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dev->locked_tasklet_func(dev);
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drm_lock_free(&dev->lock,
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DRM_KERNEL_CONTEXT);
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dev->locked_tasklet_func = NULL;
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spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
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}
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/**
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* Schedule a tasklet to call back a driver hook with the HW lock held.
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*
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* \param dev DRM device.
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* \param func Driver callback.
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*
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* This is intended for triggering actions that require the HW lock from an
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* interrupt handler. The lock will be grabbed ASAP after the interrupt handler
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* completes. Note that the callback may be called from interrupt or process
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* context, it must not make any assumptions about this. Also, the HW lock will
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* be held with the kernel context or any client context.
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*/
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void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
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{
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unsigned long irqflags;
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static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
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test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
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return;
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spin_lock_irqsave(&dev->tasklet_lock, irqflags);
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if (dev->locked_tasklet_func) {
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spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
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return;
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}
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dev->locked_tasklet_func = func;
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spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
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drm_tasklet.data = (unsigned long)dev;
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tasklet_hi_schedule(&drm_tasklet);
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}
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EXPORT_SYMBOL(drm_locked_tasklet);
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