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55#include <linux/export.h>
56#include <linux/interrupt.h>
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)
70static 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
85 if (dev->driver->irq_preinstall)
86 dev->driver->irq_preinstall(dev);
87
88
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
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
116int 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
127
128
129
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}
162EXPORT_SYMBOL(drm_legacy_irq_uninstall);
163
164int 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
172
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
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