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 nouveau_device *device = nouveau_dev(priv);
16 
17 	if (device->card_type == NV_40 && device->chipset >= 0x4c)
18 		nv_wr32(device, 0x088060, state);
19 	else if (device->chipset >= 0x40)
20 		nv_wr32(device, 0x088054, state);
21 	else
22 		nv_wr32(device, 0x001854, state);
23 
24 	if (state)
25 		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
26 		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
27 	else
28 		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
29 }
30 
31 static void
32 nouveau_switcheroo_set_state(struct pci_dev *pdev,
33 			     enum vga_switcheroo_state state)
34 {
35 	struct drm_device *dev = pci_get_drvdata(pdev);
36 
37 	if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
38 		return;
39 
40 	if (state == VGA_SWITCHEROO_ON) {
41 		printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
42 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
43 		nouveau_pmops_resume(&pdev->dev);
44 		drm_kms_helper_poll_enable(dev);
45 		dev->switch_power_state = DRM_SWITCH_POWER_ON;
46 	} else {
47 		printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
48 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
49 		drm_kms_helper_poll_disable(dev);
50 		nouveau_switcheroo_optimus_dsm();
51 		nouveau_pmops_suspend(&pdev->dev);
52 		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
53 	}
54 }
55 
56 static void
57 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
58 {
59 	struct drm_device *dev = pci_get_drvdata(pdev);
60 	nouveau_fbcon_output_poll_changed(dev);
61 }
62 
63 static bool
64 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
65 {
66 	struct drm_device *dev = pci_get_drvdata(pdev);
67 
68 	/*
69 	 * FIXME: open_count is protected by drm_global_mutex but that would lead to
70 	 * locking inversion with the driver load path. And the access here is
71 	 * completely racy anyway. So don't bother with locking for now.
72 	 */
73 	return dev->open_count == 0;
74 }
75 
76 static const struct vga_switcheroo_client_ops
77 nouveau_switcheroo_ops = {
78 	.set_gpu_state = nouveau_switcheroo_set_state,
79 	.reprobe = nouveau_switcheroo_reprobe,
80 	.can_switch = nouveau_switcheroo_can_switch,
81 };
82 
83 void
84 nouveau_vga_init(struct nouveau_drm *drm)
85 {
86 	struct drm_device *dev = drm->dev;
87 	bool runtime = false;
88 
89 	/* only relevant for PCI devices */
90 	if (!dev->pdev)
91 		return;
92 
93 	vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
94 
95 	if (nouveau_runtime_pm == 1)
96 		runtime = true;
97 	if ((nouveau_runtime_pm == -1) && (nouveau_is_optimus() || nouveau_is_v1_dsm()))
98 		runtime = true;
99 	vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
100 
101 	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
102 		vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
103 }
104 
105 void
106 nouveau_vga_fini(struct nouveau_drm *drm)
107 {
108 	struct drm_device *dev = drm->dev;
109 	vga_switcheroo_unregister_client(dev->pdev);
110 	vga_client_register(dev->pdev, NULL, NULL, NULL);
111 }
112 
113 
114 void
115 nouveau_vga_lastclose(struct drm_device *dev)
116 {
117 	vga_switcheroo_process_delayed_switch();
118 }
119