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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 | #include <drm/drm_irq.h> | |
55 | #include <drm/drmP.h> | |
56 | ||
57 | #include <linux/interrupt.h> /* For task queue support */ | |
58 | ||
59 | #include <linux/vgaarb.h> | |
60 | #include <linux/export.h> | |
61 | ||
62 | #include "drm_internal.h" | |
63 | ||
64 | /** | |
65 | * DOC: irq helpers | |
66 | * | |
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(). | |
71 | * | |
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. | |
77 | */ | |
78 | ||
79 | /** | |
80 | * drm_irq_install - install IRQ handler | |
81 | * @dev: DRM device | |
82 | * @irq: IRQ number to install the handler for | |
83 | * | |
84 | * Initializes the IRQ related data. Installs the handler, calling the driver | |
85 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before | |
86 | * and after the installation. | |
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 | |
90 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core | |
91 | * that vblank interrupts are available. | |
92 | * | |
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 | * | |
98 | * Returns: | |
99 | * Zero on success or a negative error code on failure. | |
100 | */ | |
101 | int drm_irq_install(struct drm_device *dev, int irq) | |
102 | { | |
103 | int ret; | |
104 | unsigned long sh_flags = 0; | |
105 | ||
106 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
107 | return -EINVAL; | |
108 | ||
109 | if (irq == 0) | |
110 | return -EINVAL; | |
111 | ||
112 | /* Driver must have been initialized */ | |
113 | if (!dev->dev_private) | |
114 | return -EINVAL; | |
115 | ||
116 | if (dev->irq_enabled) | |
117 | return -EBUSY; | |
118 | dev->irq_enabled = true; | |
119 | ||
120 | DRM_DEBUG("irq=%d\n", irq); | |
121 | ||
122 | /* Before installing handler */ | |
123 | if (dev->driver->irq_preinstall) | |
124 | dev->driver->irq_preinstall(dev); | |
125 | ||
126 | /* Install handler */ | |
127 | if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) | |
128 | sh_flags = IRQF_SHARED; | |
129 | ||
130 | ret = request_irq(irq, dev->driver->irq_handler, | |
131 | sh_flags, dev->driver->name, dev); | |
132 | ||
133 | if (ret < 0) { | |
134 | dev->irq_enabled = false; | |
135 | return ret; | |
136 | } | |
137 | ||
138 | /* After installing handler */ | |
139 | if (dev->driver->irq_postinstall) | |
140 | ret = dev->driver->irq_postinstall(dev); | |
141 | ||
142 | if (ret < 0) { | |
143 | dev->irq_enabled = false; | |
144 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |
145 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
146 | free_irq(irq, dev); | |
147 | } else { | |
148 | dev->irq = irq; | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | EXPORT_SYMBOL(drm_irq_install); | |
154 | ||
155 | /** | |
156 | * drm_irq_uninstall - uninstall the IRQ handler | |
157 | * @dev: DRM device | |
158 | * | |
159 | * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ | |
160 | * handler. This should only be called by drivers which used drm_irq_install() | |
161 | * to set up their interrupt handler. Other drivers must only reset | |
162 | * &drm_device.irq_enabled to false. | |
163 | * | |
164 | * Note that for kernel modesetting drivers it is a bug if this function fails. | |
165 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
166 | * the same function through an ioctl. | |
167 | * | |
168 | * Returns: | |
169 | * Zero on success or a negative error code on failure. | |
170 | */ | |
171 | int drm_irq_uninstall(struct drm_device *dev) | |
172 | { | |
173 | unsigned long irqflags; | |
174 | bool irq_enabled; | |
175 | int i; | |
176 | ||
177 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
178 | return -EINVAL; | |
179 | ||
180 | irq_enabled = dev->irq_enabled; | |
181 | dev->irq_enabled = false; | |
182 | ||
183 | /* | |
184 | * Wake up any waiters so they don't hang. This is just to paper over | |
185 | * issues for UMS drivers which aren't in full control of their | |
186 | * vblank/irq handling. KMS drivers must ensure that vblanks are all | |
187 | * disabled when uninstalling the irq handler. | |
188 | */ | |
189 | if (dev->num_crtcs) { | |
190 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
191 | for (i = 0; i < dev->num_crtcs; i++) { | |
192 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; | |
193 | ||
194 | if (!vblank->enabled) | |
195 | continue; | |
196 | ||
197 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
198 | ||
199 | drm_vblank_disable_and_save(dev, i); | |
200 | wake_up(&vblank->queue); | |
201 | } | |
202 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
203 | } | |
204 | ||
205 | if (!irq_enabled) | |
206 | return -EINVAL; | |
207 | ||
208 | DRM_DEBUG("irq=%d\n", dev->irq); | |
209 | ||
210 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) | |
211 | vga_client_register(dev->pdev, NULL, NULL, NULL); | |
212 | ||
213 | if (dev->driver->irq_uninstall) | |
214 | dev->driver->irq_uninstall(dev); | |
215 | ||
216 | free_irq(dev->irq, dev); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | EXPORT_SYMBOL(drm_irq_uninstall); | |
221 | ||
222 | int drm_legacy_irq_control(struct drm_device *dev, void *data, | |
223 | struct drm_file *file_priv) | |
224 | { | |
225 | struct drm_control *ctl = data; | |
226 | int ret = 0, irq; | |
227 | ||
228 | /* if we haven't irq we fallback for compatibility reasons - | |
229 | * this used to be a separate function in drm_dma.h | |
230 | */ | |
231 | ||
232 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) | |
233 | return 0; | |
234 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) | |
235 | return 0; | |
236 | /* UMS was only ever supported on pci devices. */ | |
237 | if (WARN_ON(!dev->pdev)) | |
238 | return -EINVAL; | |
239 | ||
240 | switch (ctl->func) { | |
241 | case DRM_INST_HANDLER: | |
242 | irq = dev->pdev->irq; | |
243 | ||
244 | if (dev->if_version < DRM_IF_VERSION(1, 2) && | |
245 | ctl->irq != irq) | |
246 | return -EINVAL; | |
247 | mutex_lock(&dev->struct_mutex); | |
248 | ret = drm_irq_install(dev, irq); | |
249 | mutex_unlock(&dev->struct_mutex); | |
250 | ||
251 | return ret; | |
252 | case DRM_UNINST_HANDLER: | |
253 | mutex_lock(&dev->struct_mutex); | |
254 | ret = drm_irq_uninstall(dev); | |
255 | mutex_unlock(&dev->struct_mutex); | |
256 | ||
257 | return ret; | |
258 | default: | |
259 | return -EINVAL; | |
260 | } | |
261 | } |