256 lines
7.9 KiB
C
256 lines
7.9 KiB
C
/*
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* drm_irq.c IRQ and vblank 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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* 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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/*
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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 <drm/drm_irq.h>
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#include <drm/drmP.h>
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/vgaarb.h>
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#include <linux/export.h>
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#include "drm_internal.h"
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/**
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* DOC: irq helpers
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*
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* The DRM core provides very simple support helpers to enable IRQ handling on a
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* device through the drm_irq_install() and drm_irq_uninstall() functions. This
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* only supports devices with a single interrupt on the main device stored in
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* &drm_device.dev and set as the device paramter in drm_dev_alloc().
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*
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* These IRQ helpers are strictly optional. Drivers which roll their own only
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* need to set &drm_device.irq_enabled to signal the DRM core that vblank
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* interrupts are working. Since these helpers don't automatically clean up the
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* requested interrupt like e.g. devm_request_irq() they're not really
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* recommended.
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*/
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/**
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* drm_irq_install - install IRQ handler
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* @dev: DRM device
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* @irq: IRQ number to install the handler for
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
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* and after the installation.
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*
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* This is the simplified helper interface provided for drivers with no special
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* needs. Drivers which need to install interrupt handlers for multiple
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* interrupts must instead set &drm_device.irq_enabled to signal the DRM core
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* that vblank interrupts are available.
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*
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* @irq must match the interrupt number that would be passed to request_irq(),
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* if called directly instead of using this helper function.
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*
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* &drm_driver.irq_handler is called to handle the registered interrupt.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_irq_install(struct drm_device *dev, int irq)
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{
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int ret;
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unsigned long sh_flags = 0;
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if (irq == 0)
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return -EINVAL;
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/* Driver must have been initialized */
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if (!dev->dev_private)
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return -EINVAL;
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if (dev->irq_enabled)
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return -EBUSY;
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dev->irq_enabled = true;
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DRM_DEBUG("irq=%d\n", irq);
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/* Before installing handler */
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if (dev->driver->irq_preinstall)
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dev->driver->irq_preinstall(dev);
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/* PCI devices require shared interrupts. */
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if (dev->pdev)
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sh_flags = IRQF_SHARED;
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ret = request_irq(irq, dev->driver->irq_handler,
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sh_flags, dev->driver->name, dev);
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if (ret < 0) {
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dev->irq_enabled = false;
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return ret;
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}
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/* After installing handler */
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if (dev->driver->irq_postinstall)
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ret = dev->driver->irq_postinstall(dev);
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if (ret < 0) {
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dev->irq_enabled = false;
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if (drm_core_check_feature(dev, DRIVER_LEGACY))
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vga_client_register(dev->pdev, NULL, NULL, NULL);
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free_irq(irq, dev);
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} else {
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dev->irq = irq;
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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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* drm_irq_uninstall - uninstall the IRQ handler
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* @dev: DRM device
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*
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* Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ
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* handler. This should only be called by drivers which used drm_irq_install()
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* to set up their interrupt handler. Other drivers must only reset
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* &drm_device.irq_enabled to false.
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*
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* Note that for kernel modesetting drivers it is a bug if this function fails.
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* The sanity checks are only to catch buggy user modesetting drivers which call
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* the same function through an ioctl.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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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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bool irq_enabled;
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int i;
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irq_enabled = dev->irq_enabled;
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dev->irq_enabled = false;
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/*
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* Wake up any waiters so they don't hang. This is just to paper over
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* issues for UMS drivers which aren't in full control of their
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* vblank/irq handling. KMS drivers must ensure that vblanks are all
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* disabled when uninstalling the irq handler.
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*/
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if (dev->num_crtcs) {
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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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struct drm_vblank_crtc *vblank = &dev->vblank[i];
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if (!vblank->enabled)
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continue;
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WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
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drm_vblank_disable_and_save(dev, i);
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wake_up(&vblank->queue);
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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}
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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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if (drm_core_check_feature(dev, DRIVER_LEGACY))
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vga_client_register(dev->pdev, NULL, NULL, NULL);
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if (dev->driver->irq_uninstall)
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dev->driver->irq_uninstall(dev);
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free_irq(dev->irq, dev);
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return 0;
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}
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EXPORT_SYMBOL(drm_irq_uninstall);
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int drm_legacy_irq_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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int ret = 0, irq;
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/* if we haven't irq we fallback for compatibility reasons -
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* this used to be a separate function in drm_dma.h
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*/
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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_LEGACY))
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return 0;
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/* UMS was only ever supported on pci devices. */
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if (WARN_ON(!dev->pdev))
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return -EINVAL;
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switch (ctl->func) {
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case DRM_INST_HANDLER:
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irq = dev->pdev->irq;
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if (dev->if_version < DRM_IF_VERSION(1, 2) &&
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ctl->irq != irq)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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ret = drm_irq_install(dev, irq);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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case DRM_UNINST_HANDLER:
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mutex_lock(&dev->struct_mutex);
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ret = drm_irq_uninstall(dev);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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default:
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return -EINVAL;
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}
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}
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