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Release 4.14 drivers/gpu/drm/drm_irq.c

Directory: drivers/gpu/drm
/*
 * drm_irq.c IRQ and vblank support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <drm/drm_irq.h>
#include <drm/drmP.h>

#include <linux/interrupt.h>	/* For task queue support */

#include <linux/vgaarb.h>
#include <linux/export.h>

#include "drm_internal.h"

/**
 * DOC: irq helpers
 *
 * The DRM core provides very simple support helpers to enable IRQ handling on a
 * device through the drm_irq_install() and drm_irq_uninstall() functions. This
 * only supports devices with a single interrupt on the main device stored in
 * &drm_device.dev and set as the device paramter in drm_dev_alloc().
 *
 * These IRQ helpers are strictly optional. Drivers which roll their own only
 * need to set &drm_device.irq_enabled to signal the DRM core that vblank
 * interrupts are working. Since these helpers don't automatically clean up the
 * requested interrupt like e.g. devm_request_irq() they're not really
 * recommended.
 */

/**
 * drm_irq_install - install IRQ handler
 * @dev: DRM device
 * @irq: IRQ number to install the handler for
 *
 * Initializes the IRQ related data. Installs the handler, calling the driver
 * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
 * and after the installation.
 *
 * This is the simplified helper interface provided for drivers with no special
 * needs. Drivers which need to install interrupt handlers for multiple
 * interrupts must instead set &drm_device.irq_enabled to signal the DRM core
 * that vblank interrupts are available.
 *
 * @irq must match the interrupt number that would be passed to request_irq(),
 * if called directly instead of using this helper function.
 *
 * &drm_driver.irq_handler is called to handle the registered interrupt.
 *
 * Returns:
 * Zero on success or a negative error code on failure.
 */

int drm_irq_install(struct drm_device *dev, int irq) { int ret; unsigned long sh_flags = 0; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; if (irq == 0) return -EINVAL; /* Driver must have been initialized */ if (!dev->dev_private) return -EINVAL; if (dev->irq_enabled) return -EBUSY; dev->irq_enabled = true; DRM_DEBUG("irq=%d\n", irq); /* Before installing handler */ if (dev->driver->irq_preinstall) dev->driver->irq_preinstall(dev); /* Install handler */ if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) sh_flags = IRQF_SHARED; ret = request_irq(irq, dev->driver->irq_handler, sh_flags, dev->driver->name, dev); if (ret < 0) { dev->irq_enabled = false; return ret; } /* After installing handler */ if (dev->driver->irq_postinstall) ret = dev->driver->irq_postinstall(dev); if (ret < 0) { dev->irq_enabled = false; if (drm_core_check_feature(dev, DRIVER_LEGACY)) vga_client_register(dev->pdev, NULL, NULL, NULL); free_irq(irq, dev); } else { dev->irq = irq; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Vetter10646.49%15.88%
Jesse Barnes3113.60%15.88%
Dave Airlie3013.16%529.41%
Michel Dänzer208.77%317.65%
Eric Anholt187.89%211.76%
Chris Wilson156.58%317.65%
Ville Syrjälä41.75%15.88%
Mario Kleiner41.75%15.88%
Total228100.00%17100.00%

EXPORT_SYMBOL(drm_irq_install); /** * drm_irq_uninstall - uninstall the IRQ handler * @dev: DRM device * * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ * handler. This should only be called by drivers which used drm_irq_install() * to set up their interrupt handler. Other drivers must only reset * &drm_device.irq_enabled to false. * * Note that for kernel modesetting drivers it is a bug if this function fails. * The sanity checks are only to catch buggy user modesetting drivers which call * the same function through an ioctl. * * Returns: * Zero on success or a negative error code on failure. */
int drm_irq_uninstall(struct drm_device *dev) { unsigned long irqflags; bool irq_enabled; int i; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; irq_enabled = dev->irq_enabled; dev->irq_enabled = false; /* * Wake up any waiters so they don't hang. This is just to paper over * issues for UMS drivers which aren't in full control of their * vblank/irq handling. KMS drivers must ensure that vblanks are all * disabled when uninstalling the irq handler. */ if (dev->num_crtcs) { spin_lock_irqsave(&dev->vbl_lock, irqflags); for (i = 0; i < dev->num_crtcs; i++) { struct drm_vblank_crtc *vblank = &dev->vblank[i]; if (!vblank->enabled) continue; WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); drm_vblank_disable_and_save(dev, i); wake_up(&vblank->queue); } spin_unlock_irqrestore(&dev->vbl_lock, irqflags); } if (!irq_enabled) return -EINVAL; DRM_DEBUG("irq=%d\n", dev->irq); if (drm_core_check_feature(dev, DRIVER_LEGACY)) vga_client_register(dev->pdev, NULL, NULL, NULL); if (dev->driver->irq_uninstall) dev->driver->irq_uninstall(dev); free_irq(dev->irq, dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Vetter15474.40%114.29%
Kristian Högsberg3617.39%114.29%
Ville Syrjälä62.90%114.29%
Jesse Barnes41.93%114.29%
Chris Wilson31.45%114.29%
Rob Clark20.97%114.29%
Mario Kleiner20.97%114.29%
Total207100.00%7100.00%

EXPORT_SYMBOL(drm_irq_uninstall);
int drm_legacy_irq_control(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_control *ctl = data; int ret = 0, irq; /* if we haven't irq we fallback for compatibility reasons - * this used to be a separate function in drm_dma.h */ if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return 0; if (!drm_core_check_feature(dev, DRIVER_LEGACY)) return 0; /* UMS was only ever supported on pci devices. */ if (WARN_ON(!dev->pdev)) return -EINVAL; switch (ctl->func) { case DRM_INST_HANDLER: irq = dev->pdev->irq; if (dev->if_version < DRM_IF_VERSION(1, 2) && ctl->irq != irq) return -EINVAL; mutex_lock(&dev->struct_mutex); ret = drm_irq_install(dev, irq); mutex_unlock(&dev->struct_mutex); return ret; case DRM_UNINST_HANDLER: mutex_lock(&dev->struct_mutex); ret = drm_irq_uninstall(dev); mutex_unlock(&dev->struct_mutex); return ret; default: return -EINVAL; } }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Vetter10156.42%216.67%
Chris Wilson1810.06%325.00%
Mario Kleiner168.94%18.33%
Ville Syrjälä168.94%216.67%
Jesse Barnes126.70%18.33%
Rob Clark84.47%18.33%
Kristian Högsberg52.79%18.33%
Thierry Reding31.68%18.33%
Total179100.00%12100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Daniel Vetter38759.72%310.00%
Jesse Barnes507.72%310.00%
Kristian Högsberg416.33%13.33%
Chris Wilson365.56%620.00%
Dave Airlie335.09%516.67%
Ville Syrjälä264.01%26.67%
Mario Kleiner223.40%13.33%
Michel Dänzer203.09%310.00%
Eric Anholt182.78%26.67%
Rob Clark101.54%26.67%
Thierry Reding30.46%13.33%
Paul Gortmaker20.31%13.33%
Total648100.00%30100.00%
Directory: drivers/gpu/drm
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