Commit | Line | Data |
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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 | ||
3ed4351a | 54 | #include <drm/drm_irq.h> |
760285e7 | 55 | #include <drm/drmP.h> |
1da177e4 LT |
56 | |
57 | #include <linux/interrupt.h> /* For task queue support */ | |
58 | ||
28d52043 | 59 | #include <linux/vgaarb.h> |
2d1a8a48 | 60 | #include <linux/export.h> |
27641c3f | 61 | |
3ed4351a | 62 | #include "drm_internal.h" |
0a3e67a4 | 63 | |
16584b20 DV |
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 | ||
1da177e4 | 79 | /** |
f5752b38 DV |
80 | * drm_irq_install - install IRQ handler |
81 | * @dev: DRM device | |
82 | * @irq: IRQ number to install the handler for | |
1da177e4 | 83 | * |
0a3e67a4 | 84 | * Initializes the IRQ related data. Installs the handler, calling the driver |
16584b20 DV |
85 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before |
86 | * and after the installation. | |
f5752b38 DV |
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 | |
ef40cbf9 | 90 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
f5752b38 DV |
91 | * that vblank interrupts are available. |
92 | * | |
16584b20 DV |
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 | * | |
f5752b38 DV |
98 | * Returns: |
99 | * Zero on success or a negative error code on failure. | |
1da177e4 | 100 | */ |
bb0f1b5c | 101 | int drm_irq_install(struct drm_device *dev, int irq) |
1da177e4 | 102 | { |
4a1b0714 | 103 | int ret; |
b5e89ed5 | 104 | unsigned long sh_flags = 0; |
1da177e4 | 105 | |
7c1a38e3 | 106 | if (irq == 0) |
1da177e4 LT |
107 | return -EINVAL; |
108 | ||
1da177e4 | 109 | /* Driver must have been initialized */ |
e090c53b | 110 | if (!dev->dev_private) |
1da177e4 | 111 | return -EINVAL; |
1da177e4 | 112 | |
e090c53b | 113 | if (dev->irq_enabled) |
1da177e4 | 114 | return -EBUSY; |
4423843c | 115 | dev->irq_enabled = true; |
1da177e4 | 116 | |
7c1a38e3 | 117 | DRM_DEBUG("irq=%d\n", irq); |
1da177e4 | 118 | |
b5e89ed5 | 119 | /* Before installing handler */ |
5037f8ac JS |
120 | if (dev->driver->irq_preinstall) |
121 | dev->driver->irq_preinstall(dev); | |
1da177e4 | 122 | |
1ff49481 DV |
123 | /* PCI devices require shared interrupts. */ |
124 | if (dev->pdev) | |
935f6e3a | 125 | sh_flags = IRQF_SHARED; |
b5e89ed5 | 126 | |
7c1a38e3 | 127 | ret = request_irq(irq, dev->driver->irq_handler, |
5829d183 | 128 | sh_flags, dev->driver->name, dev); |
9bfbd5cb | 129 | |
b5e89ed5 | 130 | if (ret < 0) { |
4423843c | 131 | dev->irq_enabled = false; |
1da177e4 LT |
132 | return ret; |
133 | } | |
134 | ||
b5e89ed5 | 135 | /* After installing handler */ |
5037f8ac JS |
136 | if (dev->driver->irq_postinstall) |
137 | ret = dev->driver->irq_postinstall(dev); | |
138 | ||
0a3e67a4 | 139 | if (ret < 0) { |
4423843c | 140 | dev->irq_enabled = false; |
fa538645 | 141 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
e1c44acc | 142 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
7c1a38e3 DV |
143 | free_irq(irq, dev); |
144 | } else { | |
145 | dev->irq = irq; | |
0a3e67a4 | 146 | } |
1da177e4 | 147 | |
0a3e67a4 | 148 | return ret; |
1da177e4 | 149 | } |
0a3e67a4 | 150 | EXPORT_SYMBOL(drm_irq_install); |
1da177e4 LT |
151 | |
152 | /** | |
f5752b38 DV |
153 | * drm_irq_uninstall - uninstall the IRQ handler |
154 | * @dev: DRM device | |
155 | * | |
16584b20 DV |
156 | * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ |
157 | * handler. This should only be called by drivers which used drm_irq_install() | |
158 | * to set up their interrupt handler. Other drivers must only reset | |
ef40cbf9 | 159 | * &drm_device.irq_enabled to false. |
1da177e4 | 160 | * |
f5752b38 DV |
161 | * Note that for kernel modesetting drivers it is a bug if this function fails. |
162 | * The sanity checks are only to catch buggy user modesetting drivers which call | |
163 | * the same function through an ioctl. | |
1da177e4 | 164 | * |
f5752b38 DV |
165 | * Returns: |
166 | * Zero on success or a negative error code on failure. | |
1da177e4 | 167 | */ |
27641c3f | 168 | int drm_irq_uninstall(struct drm_device *dev) |
1da177e4 | 169 | { |
dc1336ff | 170 | unsigned long irqflags; |
4423843c VS |
171 | bool irq_enabled; |
172 | int i; | |
1da177e4 | 173 | |
1da177e4 | 174 | irq_enabled = dev->irq_enabled; |
4423843c | 175 | dev->irq_enabled = false; |
1da177e4 | 176 | |
dc1336ff | 177 | /* |
3bff93d6 | 178 | * Wake up any waiters so they don't hang. This is just to paper over |
c78d1ca2 | 179 | * issues for UMS drivers which aren't in full control of their |
3bff93d6 DV |
180 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
181 | * disabled when uninstalling the irq handler. | |
dc1336ff | 182 | */ |
bde4889a BS |
183 | if (dev->num_crtcs) { |
184 | spin_lock_irqsave(&dev->vbl_lock, irqflags); | |
185 | for (i = 0; i < dev->num_crtcs; i++) { | |
8a51d5be VS |
186 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
187 | ||
3bff93d6 DV |
188 | if (!vblank->enabled) |
189 | continue; | |
190 | ||
191 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); | |
192 | ||
3ed4351a | 193 | drm_vblank_disable_and_save(dev, i); |
8a51d5be | 194 | wake_up(&vblank->queue); |
bde4889a BS |
195 | } |
196 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); | |
dc1336ff | 197 | } |
dc1336ff | 198 | |
b5e89ed5 | 199 | if (!irq_enabled) |
1da177e4 LT |
200 | return -EINVAL; |
201 | ||
7c1a38e3 | 202 | DRM_DEBUG("irq=%d\n", dev->irq); |
1da177e4 | 203 | |
fa538645 | 204 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
28d52043 DA |
205 | vga_client_register(dev->pdev, NULL, NULL, NULL); |
206 | ||
5037f8ac JS |
207 | if (dev->driver->irq_uninstall) |
208 | dev->driver->irq_uninstall(dev); | |
1da177e4 | 209 | |
7c1a38e3 | 210 | free_irq(dev->irq, dev); |
1da177e4 LT |
211 | |
212 | return 0; | |
213 | } | |
214 | EXPORT_SYMBOL(drm_irq_uninstall); | |
215 | ||
25a9939c DV |
216 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
217 | struct drm_file *file_priv) | |
1da177e4 | 218 | { |
c153f45f | 219 | struct drm_control *ctl = data; |
a319c1a4 | 220 | int ret = 0, irq; |
b5e89ed5 | 221 | |
27641c3f MK |
222 | /* if we haven't irq we fallback for compatibility reasons - |
223 | * this used to be a separate function in drm_dma.h | |
224 | */ | |
1da177e4 | 225 | |
22471cf6 DV |
226 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
227 | return 0; | |
fa538645 | 228 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
22471cf6 | 229 | return 0; |
c78d1ca2 | 230 | /* UMS was only ever supported on pci devices. */ |
22471cf6 DV |
231 | if (WARN_ON(!dev->pdev)) |
232 | return -EINVAL; | |
1da177e4 | 233 | |
c153f45f | 234 | switch (ctl->func) { |
1da177e4 | 235 | case DRM_INST_HANDLER: |
a319c1a4 DV |
236 | irq = dev->pdev->irq; |
237 | ||
1da177e4 | 238 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
a319c1a4 | 239 | ctl->irq != irq) |
1da177e4 | 240 | return -EINVAL; |
e090c53b | 241 | mutex_lock(&dev->struct_mutex); |
bb0f1b5c | 242 | ret = drm_irq_install(dev, irq); |
e090c53b DV |
243 | mutex_unlock(&dev->struct_mutex); |
244 | ||
245 | return ret; | |
1da177e4 | 246 | case DRM_UNINST_HANDLER: |
e090c53b DV |
247 | mutex_lock(&dev->struct_mutex); |
248 | ret = drm_irq_uninstall(dev); | |
249 | mutex_unlock(&dev->struct_mutex); | |
250 | ||
251 | return ret; | |
1da177e4 LT |
252 | default: |
253 | return -EINVAL; | |
254 | } | |
255 | } |