Commit | Line | Data |
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20c04ff7 FT |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
782e40d3 FT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
3f2dd94a FT |
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. | |
782e40d3 FT |
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. | |
7f3c3d6f HT |
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 | |
782e40d3 FT |
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. | |
7f3c3d6f HT |
52 | */ |
53 | ||
3f2dd94a | 54 | #include <drm/drm_irq.h> |
18e26a6d | 55 | #include <drm/drmP.h> |
7f3c3d6f | 56 | |
183e2373 | 57 | #include <linux/interrupt.h> /* For task queue support */ |
ba55f2f5 | 58 | |
183e2373 | 59 | #include <linux/vgaarb.h> |
ba55f2f5 FT |
60 | #include <linux/export.h> |
61 | ||
3f2dd94a | 62 | #include "drm_internal.h" |
5718399f | 63 | |
20c04ff7 | 64 | /** |
3f2dd94a | 65 | * DOC: irq helpers |
20c04ff7 | 66 | * |
3f2dd94a FT |
67 | * The DRM core provides very simple support helpers to enable IRQ handling on a |
68 | * device through the drm_irq_install() and drm_irq_uninstall() functions. This | |
69 | * only supports devices with a single interrupt on the main device stored in | |
70 | * &drm_device.dev and set as the device paramter in drm_dev_alloc(). | |
20c04ff7 | 71 | * |
3f2dd94a FT |
72 | * These IRQ helpers are strictly optional. Drivers which roll their own only |
73 | * need to set &drm_device.irq_enabled to signal the DRM core that vblank | |
74 | * interrupts are working. Since these helpers don't automatically clean up the | |
75 | * requested interrupt like e.g. devm_request_irq() they're not really | |
76 | * recommended. | |
20c04ff7 | 77 | */ |
5718399f | 78 | |
ea2ce9e4 | 79 | /** |
20c04ff7 FT |
80 | * drm_irq_install - install IRQ handler |
81 | * @dev: DRM device | |
82 | * @irq: IRQ number to install the handler for | |
ea2ce9e4 FT |
83 | * |
84 | * Initializes the IRQ related data. Installs the handler, calling the driver | |
3f2dd94a FT |
85 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before |
86 | * and after the installation. | |
20c04ff7 FT |
87 | * |
88 | * This is the simplified helper interface provided for drivers with no special | |
89 | * needs. Drivers which need to install interrupt handlers for multiple | |
a85cb24f | 90 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
20c04ff7 FT |
91 | * that vblank interrupts are available. |
92 | * | |
3f2dd94a FT |
93 | * @irq must match the interrupt number that would be passed to request_irq(), |
94 | * if called directly instead of using this helper function. | |
95 | * | |
96 | * &drm_driver.irq_handler is called to handle the registered interrupt. | |
97 | * | |
20c04ff7 FT |
98 | * Returns: |
99 | * Zero on success or a negative error code on failure. | |
ea2ce9e4 | 100 | */ |
ba55f2f5 | 101 | int drm_irq_install(struct drm_device *dev, int irq) |
03ad0861 | 102 | { |
ea2ce9e4 | 103 | int ret; |
183e2373 | 104 | unsigned long sh_flags = 0; |
03ad0861 | 105 | |
ea2ce9e4 FT |
106 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
107 | return -EINVAL; | |
03ad0861 | 108 | |
ba55f2f5 | 109 | if (irq == 0) |
ea2ce9e4 | 110 | return -EINVAL; |
03ad0861 | 111 | |
ea2ce9e4 | 112 | /* Driver must have been initialized */ |
ba55f2f5 | 113 | if (!dev->dev_private) |
ea2ce9e4 | 114 | return -EINVAL; |
ea2ce9e4 | 115 | |
ba55f2f5 | 116 | if (dev->irq_enabled) |
ea2ce9e4 | 117 | return -EBUSY; |
20c04ff7 | 118 | dev->irq_enabled = true; |
03ad0861 | 119 | |
ba55f2f5 | 120 | DRM_DEBUG("irq=%d\n", irq); |
03ad0861 FT |
121 | |
122 | /* Before installing handler */ | |
123 | if (dev->driver->irq_preinstall) | |
124 | dev->driver->irq_preinstall(dev); | |
03ad0861 FT |
125 | |
126 | /* Install handler */ | |
183e2373 FT |
127 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) |
128 | sh_flags = IRQF_SHARED; | |
ea2ce9e4 | 129 | |
183e2373 FT |
130 | ret = request_irq(irq, dev->driver->irq_handler, |
131 | sh_flags, dev->driver->name, dev); | |
132 | ||
133 | if (ret < 0) { | |
20c04ff7 | 134 | dev->irq_enabled = false; |
ea2ce9e4 FT |
135 | return ret; |
136 | } | |
03ad0861 FT |
137 | |
138 | /* After installing handler */ | |
03ad0861 | 139 | if (dev->driver->irq_postinstall) |
ea2ce9e4 | 140 | ret = dev->driver->irq_postinstall(dev); |
03ad0861 | 141 | |
ea2ce9e4 | 142 | if (ret < 0) { |
20c04ff7 | 143 | dev->irq_enabled = false; |
3f2dd94a FT |
144 | #if 0 |
145 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |
146 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
147 | #endif | |
183e2373 | 148 | free_irq(irq, dev); |
ba55f2f5 FT |
149 | } else { |
150 | dev->irq = irq; | |
ea2ce9e4 | 151 | } |
03ad0861 | 152 | |
ea2ce9e4 | 153 | return ret; |
03ad0861 | 154 | } |
ea2ce9e4 | 155 | EXPORT_SYMBOL(drm_irq_install); |
03ad0861 | 156 | |
ea2ce9e4 | 157 | /** |
20c04ff7 FT |
158 | * drm_irq_uninstall - uninstall the IRQ handler |
159 | * @dev: DRM device | |
160 | * | |
3f2dd94a FT |
161 | * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ |
162 | * handler. This should only be called by drivers which used drm_irq_install() | |
163 | * to set up their interrupt handler. Other drivers must only reset | |
a85cb24f | 164 | * &drm_device.irq_enabled to false. |
ea2ce9e4 | 165 | * |
20c04ff7 FT |
166 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
167 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
168 | * the same function through an ioctl. | |
ea2ce9e4 | 169 | * |
20c04ff7 FT |
170 | * Returns: |
171 | * Zero on success or a negative error code on failure. | |
ea2ce9e4 | 172 | */ |
03ad0861 FT |
173 | int drm_irq_uninstall(struct drm_device *dev) |
174 | { | |
93fbfa9a | 175 | unsigned long irqflags; |
782e40d3 FT |
176 | bool irq_enabled; |
177 | int i; | |
03ad0861 | 178 | |
ea2ce9e4 FT |
179 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
180 | return -EINVAL; | |
03ad0861 | 181 | |
ea2ce9e4 | 182 | irq_enabled = dev->irq_enabled; |
782e40d3 | 183 | dev->irq_enabled = false; |
03ad0861 FT |
184 | |
185 | /* | |
19c468b4 | 186 | * Wake up any waiters so they don't hang. This is just to paper over |
1dedbd3b | 187 | * issues for UMS drivers which aren't in full control of their |
19c468b4 FT |
188 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
189 | * disabled when uninstalling the irq handler. | |
ea2ce9e4 | 190 | */ |
03ad0861 | 191 | if (dev->num_crtcs) { |
93fbfa9a | 192 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
03ad0861 | 193 | for (i = 0; i < dev->num_crtcs; i++) { |
20c04ff7 FT |
194 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
195 | ||
19c468b4 FT |
196 | if (!vblank->enabled) |
197 | continue; | |
198 | ||
199 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
200 | ||
3f2dd94a | 201 | drm_vblank_disable_and_save(dev, i); |
20c04ff7 | 202 | wake_up(&vblank->queue); |
03ad0861 | 203 | } |
93fbfa9a | 204 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
03ad0861 FT |
205 | } |
206 | ||
ea2ce9e4 FT |
207 | if (!irq_enabled) |
208 | return -EINVAL; | |
209 | ||
03ad0861 FT |
210 | DRM_DEBUG("irq=%d\n", dev->irq); |
211 | ||
a85cb24f FT |
212 | #if 0 |
213 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |
214 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
215 | #endif | |
216 | ||
03ad0861 FT |
217 | if (dev->driver->irq_uninstall) |
218 | dev->driver->irq_uninstall(dev); | |
219 | ||
183e2373 | 220 | free_irq(dev->irq, dev); |
03ad0861 FT |
221 | |
222 | return 0; | |
223 | } | |
ea2ce9e4 | 224 | EXPORT_SYMBOL(drm_irq_uninstall); |
03ad0861 | 225 | |
a85cb24f FT |
226 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
227 | struct drm_file *file_priv) | |
03ad0861 FT |
228 | { |
229 | struct drm_control *ctl = data; | |
ba55f2f5 | 230 | int ret = 0, irq; |
ea2ce9e4 FT |
231 | |
232 | /* if we haven't irq we fallback for compatibility reasons - | |
233 | * this used to be a separate function in drm_dma.h | |
234 | */ | |
235 | ||
ba55f2f5 FT |
236 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
237 | return 0; | |
1dedbd3b | 238 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
ba55f2f5 | 239 | return 0; |
1dedbd3b | 240 | /* UMS was only ever supported on pci devices. */ |
ba55f2f5 FT |
241 | if (WARN_ON(!dev->pdev)) |
242 | return -EINVAL; | |
03ad0861 FT |
243 | |
244 | switch (ctl->func) { | |
245 | case DRM_INST_HANDLER: | |
d4d73b30 | 246 | irq = dev->pdev->irq; |
ba55f2f5 | 247 | |
03ad0861 | 248 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
ba55f2f5 | 249 | ctl->irq != irq) |
ea2ce9e4 | 250 | return -EINVAL; |
ba55f2f5 FT |
251 | mutex_lock(&dev->struct_mutex); |
252 | ret = drm_irq_install(dev, irq); | |
253 | mutex_unlock(&dev->struct_mutex); | |
254 | ||
255 | return ret; | |
03ad0861 | 256 | case DRM_UNINST_HANDLER: |
ba55f2f5 FT |
257 | mutex_lock(&dev->struct_mutex); |
258 | ret = drm_irq_uninstall(dev); | |
259 | mutex_unlock(&dev->struct_mutex); | |
260 | ||
261 | return ret; | |
03ad0861 | 262 | default: |
ea2ce9e4 | 263 | return -EINVAL; |
03ad0861 FT |
264 | } |
265 | } |