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 static int drm_legacy_irq_install(struct drm_device *dev, int irq) 70 { 71 int ret; 72 unsigned long sh_flags = 0; 73 74 if (irq == 0) 75 return -EINVAL; 76 77 if (dev->irq_enabled) 78 return -EBUSY; 79 dev->irq_enabled = true; 80 81 DRM_DEBUG("irq=%d\n", irq); 82 83 /* Before installing handler */ 84 if (dev->driver->irq_preinstall) 85 dev->driver->irq_preinstall(dev); 86 87 /* PCI devices require shared interrupts. */ 88 if (dev_is_pci(dev->dev)) 89 sh_flags = IRQF_SHARED; 90 91 ret = request_irq(irq, dev->driver->irq_handler, 92 sh_flags, dev->driver->name, dev); 93 94 if (ret < 0) { 95 dev->irq_enabled = false; 96 return ret; 97 } 98 99 /* After installing handler */ 100 if (dev->driver->irq_postinstall) 101 ret = dev->driver->irq_postinstall(dev); 102 103 if (ret < 0) { 104 dev->irq_enabled = false; 105 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 106 vga_client_unregister(to_pci_dev(dev->dev)); 107 free_irq(irq, dev); 108 } else { 109 dev->irq = irq; 110 } 111 112 return ret; 113 } 114 115 int drm_legacy_irq_uninstall(struct drm_device *dev) 116 { 117 unsigned long irqflags; 118 bool irq_enabled; 119 int i; 120 121 irq_enabled = dev->irq_enabled; 122 dev->irq_enabled = false; 123 124 /* 125 * Wake up any waiters so they don't hang. This is just to paper over 126 * issues for UMS drivers which aren't in full control of their 127 * vblank/irq handling. KMS drivers must ensure that vblanks are all 128 * disabled when uninstalling the irq handler. 129 */ 130 if (drm_dev_has_vblank(dev)) { 131 spin_lock_irqsave(&dev->vbl_lock, irqflags); 132 for (i = 0; i < dev->num_crtcs; i++) { 133 struct drm_vblank_crtc *vblank = &dev->vblank[i]; 134 135 if (!vblank->enabled) 136 continue; 137 138 WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); 139 140 drm_vblank_disable_and_save(dev, i); 141 wake_up(&vblank->queue); 142 } 143 spin_unlock_irqrestore(&dev->vbl_lock, irqflags); 144 } 145 146 if (!irq_enabled) 147 return -EINVAL; 148 149 DRM_DEBUG("irq=%d\n", dev->irq); 150 151 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 152 vga_client_unregister(to_pci_dev(dev->dev)); 153 154 if (dev->driver->irq_uninstall) 155 dev->driver->irq_uninstall(dev); 156 157 free_irq(dev->irq, dev); 158 159 return 0; 160 } 161 EXPORT_SYMBOL(drm_legacy_irq_uninstall); 162 163 int drm_legacy_irq_control(struct drm_device *dev, void *data, 164 struct drm_file *file_priv) 165 { 166 struct drm_control *ctl = data; 167 int ret = 0, irq; 168 struct pci_dev *pdev; 169 170 /* if we haven't irq we fallback for compatibility reasons - 171 * this used to be a separate function in drm_dma.h 172 */ 173 174 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 175 return 0; 176 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 177 return 0; 178 /* UMS was only ever supported on pci devices. */ 179 if (WARN_ON(!dev_is_pci(dev->dev))) 180 return -EINVAL; 181 182 switch (ctl->func) { 183 case DRM_INST_HANDLER: 184 pdev = to_pci_dev(dev->dev); 185 irq = pdev->irq; 186 187 if (dev->if_version < DRM_IF_VERSION(1, 2) && 188 ctl->irq != irq) 189 return -EINVAL; 190 mutex_lock(&dev->struct_mutex); 191 ret = drm_legacy_irq_install(dev, irq); 192 mutex_unlock(&dev->struct_mutex); 193 194 return ret; 195 case DRM_UNINST_HANDLER: 196 mutex_lock(&dev->struct_mutex); 197 ret = drm_legacy_irq_uninstall(dev); 198 mutex_unlock(&dev->struct_mutex); 199 200 return ret; 201 default: 202 return -EINVAL; 203 } 204 } 205