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_legacy.h> |
64 | #include <drm/drm_print.h> |
65 | #include <drm/drm_vblank.h> |
66 | |
67 | #include "drm_internal.h" |
68 | |
69 | static int drm_legacy_irq_install(struct drm_device *dev, int irq) |
70 | { |
71 | int ret; |
72 | unsigned long sh_flags = 0; |
73 | |
74 | if (irq == 0) |
75 | return -EINVAL; |
76 | |
77 | if (dev->irq_enabled) |
78 | return -EBUSY; |
79 | dev->irq_enabled = true; |
80 | |
81 | DRM_DEBUG("irq=%d\n" , irq); |
82 | |
83 | /* Before installing handler */ |
84 | if (dev->driver->irq_preinstall) |
85 | dev->driver->irq_preinstall(dev); |
86 | |
87 | /* PCI devices require shared interrupts. */ |
88 | if (dev_is_pci(dev->dev)) |
89 | sh_flags = IRQF_SHARED; |
90 | |
91 | ret = request_irq(irq, handler: dev->driver->irq_handler, |
92 | flags: sh_flags, name: dev->driver->name, dev); |
93 | |
94 | if (ret < 0) { |
95 | dev->irq_enabled = false; |
96 | return ret; |
97 | } |
98 | |
99 | /* After installing handler */ |
100 | if (dev->driver->irq_postinstall) |
101 | ret = dev->driver->irq_postinstall(dev); |
102 | |
103 | if (ret < 0) { |
104 | dev->irq_enabled = false; |
105 | if (drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
106 | vga_client_unregister(to_pci_dev(dev->dev)); |
107 | free_irq(irq, dev); |
108 | } else { |
109 | dev->irq = irq; |
110 | } |
111 | |
112 | return ret; |
113 | } |
114 | |
115 | int drm_legacy_irq_uninstall(struct drm_device *dev) |
116 | { |
117 | unsigned long irqflags; |
118 | bool irq_enabled; |
119 | int i; |
120 | |
121 | irq_enabled = dev->irq_enabled; |
122 | dev->irq_enabled = false; |
123 | |
124 | /* |
125 | * Wake up any waiters so they don't hang. This is just to paper over |
126 | * issues for UMS drivers which aren't in full control of their |
127 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
128 | * disabled when uninstalling the irq handler. |
129 | */ |
130 | if (drm_dev_has_vblank(dev)) { |
131 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
132 | for (i = 0; i < dev->num_crtcs; i++) { |
133 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
134 | |
135 | if (!vblank->enabled) |
136 | continue; |
137 | |
138 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); |
139 | |
140 | drm_vblank_disable_and_save(dev, pipe: i); |
141 | wake_up(&vblank->queue); |
142 | } |
143 | spin_unlock_irqrestore(lock: &dev->vbl_lock, flags: irqflags); |
144 | } |
145 | |
146 | if (!irq_enabled) |
147 | return -EINVAL; |
148 | |
149 | DRM_DEBUG("irq=%d\n" , dev->irq); |
150 | |
151 | if (drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
152 | vga_client_unregister(to_pci_dev(dev->dev)); |
153 | |
154 | if (dev->driver->irq_uninstall) |
155 | dev->driver->irq_uninstall(dev); |
156 | |
157 | free_irq(dev->irq, dev); |
158 | |
159 | return 0; |
160 | } |
161 | EXPORT_SYMBOL(drm_legacy_irq_uninstall); |
162 | |
163 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
164 | struct drm_file *file_priv) |
165 | { |
166 | struct drm_control *ctl = data; |
167 | int ret = 0, irq; |
168 | struct pci_dev *pdev; |
169 | |
170 | /* if we haven't irq we fallback for compatibility reasons - |
171 | * this used to be a separate function in drm_dma.h |
172 | */ |
173 | |
174 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_IRQ)) |
175 | return 0; |
176 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
177 | return 0; |
178 | /* UMS was only ever supported on pci devices. */ |
179 | if (WARN_ON(!dev_is_pci(dev->dev))) |
180 | return -EINVAL; |
181 | |
182 | switch (ctl->func) { |
183 | case DRM_INST_HANDLER: |
184 | pdev = to_pci_dev(dev->dev); |
185 | irq = pdev->irq; |
186 | |
187 | if (dev->if_version < DRM_IF_VERSION(1, 2) && |
188 | ctl->irq != irq) |
189 | return -EINVAL; |
190 | mutex_lock(&dev->struct_mutex); |
191 | ret = drm_legacy_irq_install(dev, irq); |
192 | mutex_unlock(lock: &dev->struct_mutex); |
193 | |
194 | return ret; |
195 | case DRM_UNINST_HANDLER: |
196 | mutex_lock(&dev->struct_mutex); |
197 | ret = drm_legacy_irq_uninstall(dev); |
198 | mutex_unlock(lock: &dev->struct_mutex); |
199 | |
200 | return ret; |
201 | default: |
202 | return -EINVAL; |
203 | } |
204 | } |
205 | |