| File: | dev/pci/drm/drm_irq.c |
| Warning: | line 126, column 3 Value stored to 'sh_flags' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 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_irq.h> |
| 64 | #include <drm/drm_print.h> |
| 65 | #include <drm/drm_vblank.h> |
| 66 | |
| 67 | #include "drm_internal.h" |
| 68 | |
| 69 | /** |
| 70 | * DOC: irq helpers |
| 71 | * |
| 72 | * The DRM core provides very simple support helpers to enable IRQ handling on a |
| 73 | * device through the drm_irq_install() and drm_irq_uninstall() functions. This |
| 74 | * only supports devices with a single interrupt on the main device stored in |
| 75 | * &drm_device.dev and set as the device paramter in drm_dev_alloc(). |
| 76 | * |
| 77 | * These IRQ helpers are strictly optional. Drivers which roll their own only |
| 78 | * need to set &drm_device.irq_enabled to signal the DRM core that vblank |
| 79 | * interrupts are working. Since these helpers don't automatically clean up the |
| 80 | * requested interrupt like e.g. devm_request_irq() they're not really |
| 81 | * recommended. |
| 82 | */ |
| 83 | |
| 84 | /** |
| 85 | * drm_irq_install - install IRQ handler |
| 86 | * @dev: DRM device |
| 87 | * @irq: IRQ number to install the handler for |
| 88 | * |
| 89 | * Initializes the IRQ related data. Installs the handler, calling the driver |
| 90 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before |
| 91 | * and after the installation. |
| 92 | * |
| 93 | * This is the simplified helper interface provided for drivers with no special |
| 94 | * needs. Drivers which need to install interrupt handlers for multiple |
| 95 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
| 96 | * that vblank interrupts are available. |
| 97 | * |
| 98 | * @irq must match the interrupt number that would be passed to request_irq(), |
| 99 | * if called directly instead of using this helper function. |
| 100 | * |
| 101 | * &drm_driver.irq_handler is called to handle the registered interrupt. |
| 102 | * |
| 103 | * Returns: |
| 104 | * Zero on success or a negative error code on failure. |
| 105 | */ |
| 106 | int drm_irq_install(struct drm_device *dev, int irq) |
| 107 | { |
| 108 | int ret; |
| 109 | unsigned long sh_flags = 0; |
| 110 | |
| 111 | if (irq == 0) |
| 112 | return -EINVAL22; |
| 113 | |
| 114 | if (dev->irq_enabled) |
| 115 | return -EBUSY16; |
| 116 | dev->irq_enabled = true1; |
| 117 | |
| 118 | DRM_DEBUG("irq=%d\n", irq)__drm_dbg(DRM_UT_CORE, "irq=%d\n", irq); |
| 119 | |
| 120 | /* Before installing handler */ |
| 121 | if (dev->driver->irq_preinstall) |
| 122 | dev->driver->irq_preinstall(dev); |
| 123 | |
| 124 | /* PCI devices require shared interrupts. */ |
| 125 | if (dev->pdev) |
| 126 | sh_flags = IRQF_SHARED0; |
Value stored to 'sh_flags' is never read | |
| 127 | |
| 128 | ret = request_irq(irq, dev->driver->irq_handler,(0) |
| 129 | sh_flags, dev->driver->name, dev)(0); |
| 130 | |
| 131 | if (ret < 0) { |
| 132 | dev->irq_enabled = false0; |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | /* After installing handler */ |
| 137 | if (dev->driver->irq_postinstall) |
| 138 | ret = dev->driver->irq_postinstall(dev); |
| 139 | |
| 140 | if (ret < 0) { |
| 141 | dev->irq_enabled = false0; |
| 142 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
| 143 | vga_client_register(dev->pdev, NULL((void *)0), NULL((void *)0), NULL((void *)0)); |
| 144 | free_irq(irq, dev); |
| 145 | } else { |
| 146 | dev->irq = irq; |
| 147 | } |
| 148 | |
| 149 | return ret; |
| 150 | } |
| 151 | EXPORT_SYMBOL(drm_irq_install); |
| 152 | |
| 153 | /** |
| 154 | * drm_irq_uninstall - uninstall the IRQ handler |
| 155 | * @dev: DRM device |
| 156 | * |
| 157 | * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ |
| 158 | * handler. This should only be called by drivers which used drm_irq_install() |
| 159 | * to set up their interrupt handler. Other drivers must only reset |
| 160 | * &drm_device.irq_enabled to false. |
| 161 | * |
| 162 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
| 163 | * The sanity checks are only to catch buggy user modesetting drivers which call |
| 164 | * the same function through an ioctl. |
| 165 | * |
| 166 | * Returns: |
| 167 | * Zero on success or a negative error code on failure. |
| 168 | */ |
| 169 | int drm_irq_uninstall(struct drm_device *dev) |
| 170 | { |
| 171 | unsigned long irqflags; |
| 172 | bool_Bool irq_enabled; |
| 173 | int i; |
| 174 | |
| 175 | irq_enabled = dev->irq_enabled; |
| 176 | dev->irq_enabled = false0; |
| 177 | |
| 178 | /* |
| 179 | * Wake up any waiters so they don't hang. This is just to paper over |
| 180 | * issues for UMS drivers which aren't in full control of their |
| 181 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
| 182 | * disabled when uninstalling the irq handler. |
| 183 | */ |
| 184 | if (drm_dev_has_vblank(dev)) { |
| 185 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
| 186 | for (i = 0; i < dev->num_crtcs; i++) { |
| 187 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
| 188 | |
| 189 | if (!vblank->enabled) |
| 190 | continue; |
| 191 | |
| 192 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET))({ int __ret = !!(drm_core_check_feature(dev, DRIVER_MODESET) ); if (__ret) printf("WARNING %s failed at %s:%d\n", "drm_core_check_feature(dev, DRIVER_MODESET)" , "/usr/src/sys/dev/pci/drm/drm_irq.c", 192); __builtin_expect (!!(__ret), 0); }); |
| 193 | |
| 194 | drm_vblank_disable_and_save(dev, i); |
| 195 | wake_up(&vblank->queue); |
| 196 | } |
| 197 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
| 198 | } |
| 199 | |
| 200 | if (!irq_enabled) |
| 201 | return -EINVAL22; |
| 202 | |
| 203 | DRM_DEBUG("irq=%d\n", dev->irq)__drm_dbg(DRM_UT_CORE, "irq=%d\n", dev->irq); |
| 204 | |
| 205 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
| 206 | vga_client_register(dev->pdev, NULL((void *)0), NULL((void *)0), NULL((void *)0)); |
| 207 | |
| 208 | if (dev->driver->irq_uninstall) |
| 209 | dev->driver->irq_uninstall(dev); |
| 210 | |
| 211 | free_irq(dev->irq, dev); |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | EXPORT_SYMBOL(drm_irq_uninstall); |
| 216 | |
| 217 | #if IS_ENABLED(CONFIG_DRM_LEGACY)0 |
| 218 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
| 219 | struct drm_file *file_priv) |
| 220 | { |
| 221 | struct drm_control *ctl = data; |
| 222 | int ret = 0, irq; |
| 223 | |
| 224 | /* if we haven't irq we fallback for compatibility reasons - |
| 225 | * this used to be a separate function in drm_dma.h |
| 226 | */ |
| 227 | |
| 228 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 229 | return 0; |
| 230 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
| 231 | return 0; |
| 232 | /* UMS was only ever supported on pci devices. */ |
| 233 | if (WARN_ON(!dev->pdev)({ int __ret = !!(!dev->pdev); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!dev->pdev", "/usr/src/sys/dev/pci/drm/drm_irq.c", 233) ; __builtin_expect(!!(__ret), 0); })) |
| 234 | return -EINVAL22; |
| 235 | |
| 236 | switch (ctl->func) { |
| 237 | case DRM_INST_HANDLER: |
| 238 | irq = dev->pdev->irq; |
| 239 | |
| 240 | if (dev->if_version < DRM_IF_VERSION(1, 2)(1 << 16 | 2) && |
| 241 | ctl->irq != irq) |
| 242 | return -EINVAL22; |
| 243 | mutex_lock(&dev->struct_mutex)rw_enter_write(&dev->struct_mutex); |
| 244 | ret = drm_irq_install(dev, irq); |
| 245 | mutex_unlock(&dev->struct_mutex)rw_exit_write(&dev->struct_mutex); |
| 246 | |
| 247 | return ret; |
| 248 | case DRM_UNINST_HANDLER: |
| 249 | mutex_lock(&dev->struct_mutex)rw_enter_write(&dev->struct_mutex); |
| 250 | ret = drm_irq_uninstall(dev); |
| 251 | mutex_unlock(&dev->struct_mutex)rw_exit_write(&dev->struct_mutex); |
| 252 | |
| 253 | return ret; |
| 254 | default: |
| 255 | return -EINVAL22; |
| 256 | } |
| 257 | } |
| 258 | #endif |