1 /* 2 * drm_irq.c IRQ and vblank support 3 * 4 * \author Rickard E. (Rik) Faith <faith@valinux.com> 5 * \author Gareth Hughes <gareth@valinux.com> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the next 15 * paragraph) shall be included in all copies or substantial portions of the 16 * Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 */ 26 27 /* 28 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com 29 * 30 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 31 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 32 * All Rights Reserved. 33 * 34 * Permission is hereby granted, free of charge, to any person obtaining a 35 * copy of this software and associated documentation files (the "Software"), 36 * to deal in the Software without restriction, including without limitation 37 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 38 * and/or sell copies of the Software, and to permit persons to whom the 39 * Software is furnished to do so, subject to the following conditions: 40 * 41 * The above copyright notice and this permission notice (including the next 42 * paragraph) shall be included in all copies or substantial portions of the 43 * Software. 44 * 45 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 46 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 47 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 48 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 49 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 50 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 51 * OTHER DEALINGS IN THE SOFTWARE. 52 */ 53 54 55 #include <linux/export.h> 56 #include <linux/interrupt.h> /* For task queue support */ 57 #include <linux/pci.h> 58 #include <linux/vgaarb.h> 59 60 #include <drm/drm.h> 61 #include <drm/drm_device.h> 62 #include <drm/drm_drv.h> 63 #include <drm/drm_legacy.h> 64 #include <drm/drm_print.h> 65 #include <drm/drm_vblank.h> 66 67 #include "drm_internal.h" 68 69 #if IS_ENABLED(CONFIG_DRM_LEGACY) 70 static int drm_legacy_irq_install(struct drm_device *dev, int irq) 71 { 72 int ret; 73 unsigned long sh_flags = 0; 74 75 if (irq == 0) 76 return -EINVAL; 77 78 if (dev->irq_enabled) 79 return -EBUSY; 80 dev->irq_enabled = true; 81 82 DRM_DEBUG("irq=%d\n", irq); 83 84 /* Before installing handler */ 85 if (dev->driver->irq_preinstall) 86 dev->driver->irq_preinstall(dev); 87 88 /* PCI devices require shared interrupts. */ 89 if (dev_is_pci(dev->dev)) 90 sh_flags = IRQF_SHARED; 91 92 ret = request_irq(irq, dev->driver->irq_handler, 93 sh_flags, dev->driver->name, dev); 94 95 if (ret < 0) { 96 dev->irq_enabled = false; 97 return ret; 98 } 99 100 /* After installing handler */ 101 if (dev->driver->irq_postinstall) 102 ret = dev->driver->irq_postinstall(dev); 103 104 if (ret < 0) { 105 dev->irq_enabled = false; 106 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 107 vga_client_unregister(to_pci_dev(dev->dev)); 108 free_irq(irq, dev); 109 } else { 110 dev->irq = irq; 111 } 112 113 return ret; 114 } 115 116 int drm_legacy_irq_uninstall(struct drm_device *dev) 117 { 118 unsigned long irqflags; 119 bool irq_enabled; 120 int i; 121 122 irq_enabled = dev->irq_enabled; 123 dev->irq_enabled = false; 124 125 /* 126 * Wake up any waiters so they don't hang. This is just to paper over 127 * issues for UMS drivers which aren't in full control of their 128 * vblank/irq handling. KMS drivers must ensure that vblanks are all 129 * disabled when uninstalling the irq handler. 130 */ 131 if (drm_dev_has_vblank(dev)) { 132 spin_lock_irqsave(&dev->vbl_lock, irqflags); 133 for (i = 0; i < dev->num_crtcs; i++) { 134 struct drm_vblank_crtc *vblank = &dev->vblank[i]; 135 136 if (!vblank->enabled) 137 continue; 138 139 WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); 140 141 drm_vblank_disable_and_save(dev, i); 142 wake_up(&vblank->queue); 143 } 144 spin_unlock_irqrestore(&dev->vbl_lock, irqflags); 145 } 146 147 if (!irq_enabled) 148 return -EINVAL; 149 150 DRM_DEBUG("irq=%d\n", dev->irq); 151 152 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 153 vga_client_unregister(to_pci_dev(dev->dev)); 154 155 if (dev->driver->irq_uninstall) 156 dev->driver->irq_uninstall(dev); 157 158 free_irq(dev->irq, dev); 159 160 return 0; 161 } 162 EXPORT_SYMBOL(drm_legacy_irq_uninstall); 163 164 int drm_legacy_irq_control(struct drm_device *dev, void *data, 165 struct drm_file *file_priv) 166 { 167 struct drm_control *ctl = data; 168 int ret = 0, irq; 169 struct pci_dev *pdev; 170 171 /* if we haven't irq we fallback for compatibility reasons - 172 * this used to be a separate function in drm_dma.h 173 */ 174 175 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 176 return 0; 177 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 178 return 0; 179 /* UMS was only ever supported on pci devices. */ 180 if (WARN_ON(!dev_is_pci(dev->dev))) 181 return -EINVAL; 182 183 switch (ctl->func) { 184 case DRM_INST_HANDLER: 185 pdev = to_pci_dev(dev->dev); 186 irq = pdev->irq; 187 188 if (dev->if_version < DRM_IF_VERSION(1, 2) && 189 ctl->irq != irq) 190 return -EINVAL; 191 mutex_lock(&dev->struct_mutex); 192 ret = drm_legacy_irq_install(dev, irq); 193 mutex_unlock(&dev->struct_mutex); 194 195 return ret; 196 case DRM_UNINST_HANDLER: 197 mutex_lock(&dev->struct_mutex); 198 ret = drm_legacy_irq_uninstall(dev); 199 mutex_unlock(&dev->struct_mutex); 200 201 return ret; 202 default: 203 return -EINVAL; 204 } 205 } 206 #endif 207