Commit | Line | Data |
---|---|---|
f5752b38 DV |
1 | /* |
2 | * drm_irq.c IRQ and vblank support | |
1da177e4 LT |
3 | * |
4 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
5 | * \author Gareth Hughes <gareth@valinux.com> | |
3ed4351a DV |
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. | |
1da177e4 LT |
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 | ||
1da177e4 | 54 | |
0500c04e | 55 | #include <linux/export.h> |
1da177e4 | 56 | #include <linux/interrupt.h> /* For task queue support */ |
0500c04e | 57 | #include <linux/pci.h> |
28d52043 | 58 | #include <linux/vgaarb.h> |
0500c04e SR |
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> | |
27641c3f | 66 | |
3ed4351a | 67 | #include "drm_internal.h" |
0a3e67a4 | 68 | |
16584b20 DV |
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 | ||
1da177e4 | 84 | /** |
f5752b38 DV |
85 | * drm_irq_install - install IRQ handler |
86 | * @dev: DRM device | |
87 | * @irq: IRQ number to install the handler for | |
1da177e4 | 88 | * |
0a3e67a4 | 89 | * Initializes the IRQ related data. Installs the handler, calling the driver |
16584b20 DV |
90 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before |
91 | * and after the installation. | |
f5752b38 DV |
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 | |
ef40cbf9 | 95 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
f5752b38 DV |
96 | * that vblank interrupts are available. |
97 | * | |
16584b20 DV |
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 | * | |
f5752b38 DV |
103 | * Returns: |
104 | * Zero on success or a negative error code on failure. | |
1da177e4 | 105 | */ |
bb0f1b5c | 106 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 107 | { |
4a1b0714 | 108 | int ret; |
b5e89ed5 | 109 | unsigned long sh_flags = 0; |
1da177e4 | 110 | |
7c1a38e3 | 111 | if (irq == 0) |
1da177e4 LT |
112 | return -EINVAL; |
113 | ||
e090c53b | 114 | if (dev->irq_enabled) |
1da177e4 | 115 | return -EBUSY; |
4423843c | 116 | dev->irq_enabled = true; |
1da177e4 | 117 | |
7c1a38e3 | 118 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 119 | |
b5e89ed5 | 120 | /* Before installing handler */ |
5037f8ac JS |
121 | if (dev->driver->irq_preinstall) |
122 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 123 | |
1ff49481 DV |
124 | /* PCI devices require shared interrupts. */ |
125 | if (dev->pdev) | |
935f6e3a | 126 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 127 | |
7c1a38e3 | 128 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 129 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 130 | |
b5e89ed5 | 131 | if (ret < 0) { |
4423843c | 132 | dev->irq_enabled = false; |
1da177e4 LT |
133 | return ret; |
134 | } | |
135 | ||
b5e89ed5 | 136 | /* After installing handler */ |
5037f8ac JS |
137 | if (dev->driver->irq_postinstall) |
138 | ret = dev->driver->irq_postinstall(dev); | |
139 | ||
0a3e67a4 | 140 | if (ret < 0) { |
4423843c | 141 | dev->irq_enabled = false; |
fa538645 | 142 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
e1c44acc | 143 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
7c1a38e3 DV |
144 | free_irq(irq, dev); |
145 | } else { | |
146 | dev->irq = irq; | |
0a3e67a4 | 147 | } |
1da177e4 | 148 | |
0a3e67a4 | 149 | return ret; |
1da177e4 | 150 | } |
0a3e67a4 | 151 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
152 | |
153 | /** | |
f5752b38 DV |
154 | * drm_irq_uninstall - uninstall the IRQ handler |
155 | * @dev: DRM device | |
156 | * | |
16584b20 DV |
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 | |
ef40cbf9 | 160 | * &drm_device.irq_enabled to false. |
1da177e4 | 161 | * |
f5752b38 DV |
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. | |
1da177e4 | 165 | * |
f5752b38 DV |
166 | * Returns: |
167 | * Zero on success or a negative error code on failure. | |
1da177e4 | 168 | */ |
27641c3f | 169 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 170 | { |
dc1336ff | 171 | unsigned long irqflags; |
4423843c VS |
172 | bool irq_enabled; |
173 | int i; | |
1da177e4 | 174 | |
1da177e4 | 175 | irq_enabled = dev->irq_enabled; |
4423843c | 176 | dev->irq_enabled = false; |
1da177e4 | 177 | |
dc1336ff | 178 | /* |
3bff93d6 | 179 | * Wake up any waiters so they don't hang. This is just to paper over |
c78d1ca2 | 180 | * issues for UMS drivers which aren't in full control of their |
3bff93d6 DV |
181 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
182 | * disabled when uninstalling the irq handler. | |
dc1336ff | 183 | */ |
6015002e | 184 | if (drm_dev_has_vblank(dev)) { |
bde4889a BS |
185 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
186 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
187 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
188 | ||
3bff93d6 DV |
189 | if (!vblank->enabled) |
190 | continue; | |
191 | ||
192 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
193 | ||
3ed4351a | 194 | drm_vblank_disable_and_save(dev, i); |
8a51d5be | 195 | wake_up(&vblank->queue); |
bde4889a BS |
196 | } |
197 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 198 | } |
dc1336ff | 199 | |
b5e89ed5 | 200 | if (!irq_enabled) |
1da177e4 LT |
201 | return -EINVAL; |
202 | ||
7c1a38e3 | 203 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 204 | |
fa538645 | 205 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
206 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
207 | ||
5037f8ac JS |
208 | if (dev->driver->irq_uninstall) |
209 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 210 | |
7c1a38e3 | 211 | free_irq(dev->irq, dev); |
1da177e4 LT |
212 | |
213 | return 0; | |
214 | } | |
215 | EXPORT_SYMBOL(drm_irq_uninstall); | |
216 | ||
61ae2270 | 217 | #if IS_ENABLED(CONFIG_DRM_LEGACY) |
25a9939c DV |
218 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
219 | struct drm_file *file_priv) | |
1da177e4 | 220 | { |
c153f45f | 221 | struct drm_control *ctl = data; |
a319c1a4 | 222 | int ret = 0, irq; |
b5e89ed5 | 223 | |
27641c3f MK |
224 | /* if we haven't irq we fallback for compatibility reasons - |
225 | * this used to be a separate function in drm_dma.h | |
226 | */ | |
1da177e4 | 227 | |
22471cf6 DV |
228 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
229 | return 0; | |
fa538645 | 230 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
22471cf6 | 231 | return 0; |
c78d1ca2 | 232 | /* UMS was only ever supported on pci devices. */ |
22471cf6 DV |
233 | if (WARN_ON(!dev->pdev)) |
234 | return -EINVAL; | |
1da177e4 | 235 | |
c153f45f | 236 | switch (ctl->func) { |
1da177e4 | 237 | case DRM_INST_HANDLER: |
a319c1a4 DV |
238 | irq = dev->pdev->irq; |
239 | ||
1da177e4 | 240 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 241 | ctl->irq != irq) |
1da177e4 | 242 | return -EINVAL; |
e090c53b | 243 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 244 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
245 | mutex_unlock(&dev->struct_mutex); |
246 | ||
247 | return ret; | |
1da177e4 | 248 | case DRM_UNINST_HANDLER: |
e090c53b DV |
249 | mutex_lock(&dev->struct_mutex); |
250 | ret = drm_irq_uninstall(dev); | |
251 | mutex_unlock(&dev->struct_mutex); | |
252 | ||
253 | return ret; | |
1da177e4 LT |
254 | default: |
255 | return -EINVAL; | |
256 | } | |
257 | } | |
61ae2270 | 258 | #endif |