1 #include <linux/vgaarb.h>
2 #include <linux/vga_switcheroo.h>
3 
4 #include <drm/drmP.h>
5 #include <drm/drm_crtc_helper.h>
6 
7 #include "nouveau_drm.h"
8 #include "nouveau_acpi.h"
9 #include "nouveau_fbcon.h"
10 #include "nouveau_vga.h"
11 
12 static unsigned int
13 nouveau_vga_set_decode(void *priv, bool state)
14 {
15 	struct nvif_device *device = &nouveau_drm(priv)->device;
16 
17 	if (device->info.family == NV_DEVICE_INFO_V0_CURIE &&
18 	    device->info.chipset >= 0x4c)
19 		nvif_wr32(device, 0x088060, state);
20 	else
21 	if (device->info.chipset >= 0x40)
22 		nvif_wr32(device, 0x088054, state);
23 	else
24 		nvif_wr32(device, 0x001854, state);
25 
26 	if (state)
27 		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
28 		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
29 	else
30 		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
31 }
32 
33 static void
34 nouveau_switcheroo_set_state(struct pci_dev *pdev,
35 			     enum vga_switcheroo_state state)
36 {
37 	struct drm_device *dev = pci_get_drvdata(pdev);
38 
39 	if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
40 		return;
41 
42 	if (state == VGA_SWITCHEROO_ON) {
43 		printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
44 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
45 		nouveau_pmops_resume(&pdev->dev);
46 		drm_kms_helper_poll_enable(dev);
47 		dev->switch_power_state = DRM_SWITCH_POWER_ON;
48 	} else {
49 		printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
50 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
51 		drm_kms_helper_poll_disable(dev);
52 		nouveau_switcheroo_optimus_dsm();
53 		nouveau_pmops_suspend(&pdev->dev);
54 		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
55 	}
56 }
57 
58 static void
59 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
60 {
61 	struct drm_device *dev = pci_get_drvdata(pdev);
62 	nouveau_fbcon_output_poll_changed(dev);
63 }
64 
65 static bool
66 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
67 {
68 	struct drm_device *dev = pci_get_drvdata(pdev);
69 
70 	/*
71 	 * FIXME: open_count is protected by drm_global_mutex but that would lead to
72 	 * locking inversion with the driver load path. And the access here is
73 	 * completely racy anyway. So don't bother with locking for now.
74 	 */
75 	return dev->open_count == 0;
76 }
77 
78 static const struct vga_switcheroo_client_ops
79 nouveau_switcheroo_ops = {
80 	.set_gpu_state = nouveau_switcheroo_set_state,
81 	.reprobe = nouveau_switcheroo_reprobe,
82 	.can_switch = nouveau_switcheroo_can_switch,
83 };
84 
85 void
86 nouveau_vga_init(struct nouveau_drm *drm)
87 {
88 	struct drm_device *dev = drm->dev;
89 	bool runtime = false;
90 
91 	/* only relevant for PCI devices */
92 	if (!dev->pdev)
93 		return;
94 
95 	vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
96 
97 	if (nouveau_runtime_pm == 1)
98 		runtime = true;
99 	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
100 		runtime = true;
101 	vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
102 
103 	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
104 		vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
105 }
106 
107 void
108 nouveau_vga_fini(struct nouveau_drm *drm)
109 {
110 	struct drm_device *dev = drm->dev;
111 	vga_switcheroo_unregister_client(dev->pdev);
112 	vga_client_register(dev->pdev, NULL, NULL, NULL);
113 }
114 
115 
116 void
117 nouveau_vga_lastclose(struct drm_device *dev)
118 {
119 	vga_switcheroo_process_delayed_switch();
120 }
121