/* * 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_legacy.h> #include <drm/drm_print.h> #include <drm/drm_vblank.h> #include "drm_internal.h" static int drm_legacy_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_is_pci(dev->dev)) 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_unregister(to_pci_dev(dev->dev)); free_irq(irq, dev); } else { dev->irq = irq; } return ret; } int drm_legacy_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_unregister(to_pci_dev(dev->dev)); if (dev->driver->irq_uninstall) dev->driver->irq_uninstall(dev); free_irq(dev->irq, dev); return 0; } EXPORT_SYMBOL(drm_legacy_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; struct pci_dev *pdev; /* 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_is_pci(dev->dev))) return -EINVAL; switch (ctl->func) { case DRM_INST_HANDLER: pdev = to_pci_dev(dev->dev); irq = pdev->irq; if (dev->if_version < DRM_IF_VERSION(1, 2) && ctl->irq != irq) return -EINVAL; mutex_lock(&dev->struct_mutex); ret = drm_legacy_irq_install(dev, irq); mutex_unlock(&dev->struct_mutex); return ret; case DRM_UNINST_HANDLER: mutex_lock(&dev->struct_mutex); ret = drm_legacy_irq_uninstall(dev); mutex_unlock(&dev->struct_mutex); return ret; default: return -EINVAL; } }