File: | dev/pci/drm/drm_irq.c |
Warning: | line 126, column 3 Value stored to 'sh_flags' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
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_irq.h> |
64 | #include <drm/drm_print.h> |
65 | #include <drm/drm_vblank.h> |
66 | |
67 | #include "drm_internal.h" |
68 | |
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 | |
84 | /** |
85 | * drm_irq_install - install IRQ handler |
86 | * @dev: DRM device |
87 | * @irq: IRQ number to install the handler for |
88 | * |
89 | * Initializes the IRQ related data. Installs the handler, calling the driver |
90 | * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before |
91 | * and after the installation. |
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 |
95 | * interrupts must instead set &drm_device.irq_enabled to signal the DRM core |
96 | * that vblank interrupts are available. |
97 | * |
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 | * |
103 | * Returns: |
104 | * Zero on success or a negative error code on failure. |
105 | */ |
106 | int drm_irq_install(struct drm_device *dev, int irq) |
107 | { |
108 | int ret; |
109 | unsigned long sh_flags = 0; |
110 | |
111 | if (irq == 0) |
112 | return -EINVAL22; |
113 | |
114 | if (dev->irq_enabled) |
115 | return -EBUSY16; |
116 | dev->irq_enabled = true1; |
117 | |
118 | DRM_DEBUG("irq=%d\n", irq)__drm_dbg(DRM_UT_CORE, "irq=%d\n", irq); |
119 | |
120 | /* Before installing handler */ |
121 | if (dev->driver->irq_preinstall) |
122 | dev->driver->irq_preinstall(dev); |
123 | |
124 | /* PCI devices require shared interrupts. */ |
125 | if (dev->pdev) |
126 | sh_flags = IRQF_SHARED0; |
Value stored to 'sh_flags' is never read | |
127 | |
128 | ret = request_irq(irq, dev->driver->irq_handler,(0) |
129 | sh_flags, dev->driver->name, dev)(0); |
130 | |
131 | if (ret < 0) { |
132 | dev->irq_enabled = false0; |
133 | return ret; |
134 | } |
135 | |
136 | /* After installing handler */ |
137 | if (dev->driver->irq_postinstall) |
138 | ret = dev->driver->irq_postinstall(dev); |
139 | |
140 | if (ret < 0) { |
141 | dev->irq_enabled = false0; |
142 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
143 | vga_client_register(dev->pdev, NULL((void *)0), NULL((void *)0), NULL((void *)0)); |
144 | free_irq(irq, dev); |
145 | } else { |
146 | dev->irq = irq; |
147 | } |
148 | |
149 | return ret; |
150 | } |
151 | EXPORT_SYMBOL(drm_irq_install); |
152 | |
153 | /** |
154 | * drm_irq_uninstall - uninstall the IRQ handler |
155 | * @dev: DRM device |
156 | * |
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 |
160 | * &drm_device.irq_enabled to false. |
161 | * |
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. |
165 | * |
166 | * Returns: |
167 | * Zero on success or a negative error code on failure. |
168 | */ |
169 | int drm_irq_uninstall(struct drm_device *dev) |
170 | { |
171 | unsigned long irqflags; |
172 | bool_Bool irq_enabled; |
173 | int i; |
174 | |
175 | irq_enabled = dev->irq_enabled; |
176 | dev->irq_enabled = false0; |
177 | |
178 | /* |
179 | * Wake up any waiters so they don't hang. This is just to paper over |
180 | * issues for UMS drivers which aren't in full control of their |
181 | * vblank/irq handling. KMS drivers must ensure that vblanks are all |
182 | * disabled when uninstalling the irq handler. |
183 | */ |
184 | if (drm_dev_has_vblank(dev)) { |
185 | spin_lock_irqsave(&dev->vbl_lock, irqflags)do { irqflags = 0; mtx_enter(&dev->vbl_lock); } while ( 0); |
186 | for (i = 0; i < dev->num_crtcs; i++) { |
187 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
188 | |
189 | if (!vblank->enabled) |
190 | continue; |
191 | |
192 | WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET))({ int __ret = !!(drm_core_check_feature(dev, DRIVER_MODESET) ); if (__ret) printf("WARNING %s failed at %s:%d\n", "drm_core_check_feature(dev, DRIVER_MODESET)" , "/usr/src/sys/dev/pci/drm/drm_irq.c", 192); __builtin_expect (!!(__ret), 0); }); |
193 | |
194 | drm_vblank_disable_and_save(dev, i); |
195 | wake_up(&vblank->queue); |
196 | } |
197 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags)do { (void)(irqflags); mtx_leave(&dev->vbl_lock); } while (0); |
198 | } |
199 | |
200 | if (!irq_enabled) |
201 | return -EINVAL22; |
202 | |
203 | DRM_DEBUG("irq=%d\n", dev->irq)__drm_dbg(DRM_UT_CORE, "irq=%d\n", dev->irq); |
204 | |
205 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
206 | vga_client_register(dev->pdev, NULL((void *)0), NULL((void *)0), NULL((void *)0)); |
207 | |
208 | if (dev->driver->irq_uninstall) |
209 | dev->driver->irq_uninstall(dev); |
210 | |
211 | free_irq(dev->irq, dev); |
212 | |
213 | return 0; |
214 | } |
215 | EXPORT_SYMBOL(drm_irq_uninstall); |
216 | |
217 | #if IS_ENABLED(CONFIG_DRM_LEGACY)0 |
218 | int drm_legacy_irq_control(struct drm_device *dev, void *data, |
219 | struct drm_file *file_priv) |
220 | { |
221 | struct drm_control *ctl = data; |
222 | int ret = 0, irq; |
223 | |
224 | /* if we haven't irq we fallback for compatibility reasons - |
225 | * this used to be a separate function in drm_dma.h |
226 | */ |
227 | |
228 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
229 | return 0; |
230 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
231 | return 0; |
232 | /* UMS was only ever supported on pci devices. */ |
233 | if (WARN_ON(!dev->pdev)({ int __ret = !!(!dev->pdev); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!dev->pdev", "/usr/src/sys/dev/pci/drm/drm_irq.c", 233) ; __builtin_expect(!!(__ret), 0); })) |
234 | return -EINVAL22; |
235 | |
236 | switch (ctl->func) { |
237 | case DRM_INST_HANDLER: |
238 | irq = dev->pdev->irq; |
239 | |
240 | if (dev->if_version < DRM_IF_VERSION(1, 2)(1 << 16 | 2) && |
241 | ctl->irq != irq) |
242 | return -EINVAL22; |
243 | mutex_lock(&dev->struct_mutex)rw_enter_write(&dev->struct_mutex); |
244 | ret = drm_irq_install(dev, irq); |
245 | mutex_unlock(&dev->struct_mutex)rw_exit_write(&dev->struct_mutex); |
246 | |
247 | return ret; |
248 | case DRM_UNINST_HANDLER: |
249 | mutex_lock(&dev->struct_mutex)rw_enter_write(&dev->struct_mutex); |
250 | ret = drm_irq_uninstall(dev); |
251 | mutex_unlock(&dev->struct_mutex)rw_exit_write(&dev->struct_mutex); |
252 | |
253 | return ret; |
254 | default: |
255 | return -EINVAL22; |
256 | } |
257 | } |
258 | #endif |