diff options
Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c new file mode 100644 index 000000000..09d6e9e2e --- /dev/null +++ b/drivers/gpu/drm/drm_irq.c @@ -0,0 +1,258 @@ +/* + * 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 <linux/export.h> +#include <linux/interrupt.h> /* For task queue support */ +#include <linux/pci.h> +#include <linux/vgaarb.h> + +#include <drm/drm.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_irq.h> +#include <drm/drm_print.h> +#include <drm/drm_vblank.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 (irq == 0) + 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); + + /* PCI devices require shared interrupts. */ + if (dev->pdev) + 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; +} +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; + + 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 (drm_dev_has_vblank(dev)) { + 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; +} +EXPORT_SYMBOL(drm_irq_uninstall); + +#if IS_ENABLED(CONFIG_DRM_LEGACY) +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; + } +} +#endif |