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 #if IS_ENABLED(CONFIG_DRM_LEGACY)
drm_legacy_irq_install(struct drm_device * dev,int irq)70 static int drm_legacy_irq_install(struct drm_device *dev, int irq)
71 {
72 int ret;
73 unsigned long sh_flags = 0;
74
75 if (irq == 0)
76 return -EINVAL;
77
78 if (dev->irq_enabled)
79 return -EBUSY;
80 dev->irq_enabled = true;
81
82 DRM_DEBUG("irq=%d\n", irq);
83
84 /* Before installing handler */
85 if (dev->driver->irq_preinstall)
86 dev->driver->irq_preinstall(dev);
87
88 /* PCI devices require shared interrupts. */
89 if (dev_is_pci(dev->dev))
90 sh_flags = IRQF_SHARED;
91
92 ret = request_irq(irq, dev->driver->irq_handler,
93 sh_flags, dev->driver->name, dev);
94
95 if (ret < 0) {
96 dev->irq_enabled = false;
97 return ret;
98 }
99
100 /* After installing handler */
101 if (dev->driver->irq_postinstall)
102 ret = dev->driver->irq_postinstall(dev);
103
104 if (ret < 0) {
105 dev->irq_enabled = false;
106 if (drm_core_check_feature(dev, DRIVER_LEGACY))
107 vga_client_unregister(to_pci_dev(dev->dev));
108 free_irq(irq, dev);
109 } else {
110 dev->irq = irq;
111 }
112
113 return ret;
114 }
115
drm_legacy_irq_uninstall(struct drm_device * dev)116 int drm_legacy_irq_uninstall(struct drm_device *dev)
117 {
118 unsigned long irqflags;
119 bool irq_enabled;
120 int i;
121
122 irq_enabled = dev->irq_enabled;
123 dev->irq_enabled = false;
124
125 /*
126 * Wake up any waiters so they don't hang. This is just to paper over
127 * issues for UMS drivers which aren't in full control of their
128 * vblank/irq handling. KMS drivers must ensure that vblanks are all
129 * disabled when uninstalling the irq handler.
130 */
131 if (drm_dev_has_vblank(dev)) {
132 spin_lock_irqsave(&dev->vbl_lock, irqflags);
133 for (i = 0; i < dev->num_crtcs; i++) {
134 struct drm_vblank_crtc *vblank = &dev->vblank[i];
135
136 if (!vblank->enabled)
137 continue;
138
139 WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
140
141 drm_vblank_disable_and_save(dev, i);
142 wake_up(&vblank->queue);
143 }
144 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
145 }
146
147 if (!irq_enabled)
148 return -EINVAL;
149
150 DRM_DEBUG("irq=%d\n", dev->irq);
151
152 if (drm_core_check_feature(dev, DRIVER_LEGACY))
153 vga_client_unregister(to_pci_dev(dev->dev));
154
155 if (dev->driver->irq_uninstall)
156 dev->driver->irq_uninstall(dev);
157
158 free_irq(dev->irq, dev);
159
160 return 0;
161 }
162 EXPORT_SYMBOL(drm_legacy_irq_uninstall);
163
drm_legacy_irq_control(struct drm_device * dev,void * data,struct drm_file * file_priv)164 int drm_legacy_irq_control(struct drm_device *dev, void *data,
165 struct drm_file *file_priv)
166 {
167 struct drm_control *ctl = data;
168 int ret = 0, irq;
169 struct pci_dev *pdev;
170
171 /* if we haven't irq we fallback for compatibility reasons -
172 * this used to be a separate function in drm_dma.h
173 */
174
175 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
176 return 0;
177 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
178 return 0;
179 /* UMS was only ever supported on pci devices. */
180 if (WARN_ON(!dev_is_pci(dev->dev)))
181 return -EINVAL;
182
183 switch (ctl->func) {
184 case DRM_INST_HANDLER:
185 pdev = to_pci_dev(dev->dev);
186 irq = pdev->irq;
187
188 if (dev->if_version < DRM_IF_VERSION(1, 2) &&
189 ctl->irq != irq)
190 return -EINVAL;
191 mutex_lock(&dev->struct_mutex);
192 ret = drm_legacy_irq_install(dev, irq);
193 mutex_unlock(&dev->struct_mutex);
194
195 return ret;
196 case DRM_UNINST_HANDLER:
197 mutex_lock(&dev->struct_mutex);
198 ret = drm_legacy_irq_uninstall(dev);
199 mutex_unlock(&dev->struct_mutex);
200
201 return ret;
202 default:
203 return -EINVAL;
204 }
205 }
206 #endif
207