1 // SPDX-License-Identifier: MIT
2 #include <linux/vgaarb.h>
3 #include <linux/vga_switcheroo.h>
4
5 #include <drm/drm_client_event.h>
6
7 #include "nouveau_drv.h"
8 #include "nouveau_acpi.h"
9 #include "nouveau_vga.h"
10
11 static unsigned int
nouveau_vga_set_decode(struct pci_dev * pdev,bool state)12 nouveau_vga_set_decode(struct pci_dev *pdev, bool state)
13 {
14 struct nouveau_drm *drm = pci_get_drvdata(pdev);
15 struct nvif_object *device = &drm->client.device.object;
16
17 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE &&
18 drm->client.device.info.chipset >= 0x4c)
19 nvif_wr32(device, 0x088060, state);
20 else
21 if (drm->client.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
nouveau_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)34 nouveau_switcheroo_set_state(struct pci_dev *pdev,
35 enum vga_switcheroo_state state)
36 {
37 struct nouveau_drm *drm = pci_get_drvdata(pdev);
38 struct drm_device *dev = drm->dev;
39
40 if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
41 return;
42
43 if (state == VGA_SWITCHEROO_ON) {
44 pr_err("VGA switcheroo: switched nouveau on\n");
45 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
46 nouveau_pmops_resume(&pdev->dev);
47 dev->switch_power_state = DRM_SWITCH_POWER_ON;
48 } else {
49 pr_err("VGA switcheroo: switched nouveau off\n");
50 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
51 nouveau_switcheroo_optimus_dsm();
52 nouveau_pmops_suspend(&pdev->dev);
53 dev->switch_power_state = DRM_SWITCH_POWER_OFF;
54 }
55 }
56
57 static void
nouveau_switcheroo_reprobe(struct pci_dev * pdev)58 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
59 {
60 struct nouveau_drm *drm = pci_get_drvdata(pdev);
61 struct drm_device *dev = drm->dev;
62
63 drm_client_dev_hotplug(dev);
64 }
65
66 static bool
nouveau_switcheroo_can_switch(struct pci_dev * pdev)67 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
68 {
69 struct nouveau_drm *drm = pci_get_drvdata(pdev);
70
71 /*
72 * FIXME: open_count is protected by drm_global_mutex but that would lead to
73 * locking inversion with the driver load path. And the access here is
74 * completely racy anyway. So don't bother with locking for now.
75 */
76 return atomic_read(&drm->dev->open_count) == 0;
77 }
78
79 static const struct vga_switcheroo_client_ops
80 nouveau_switcheroo_ops = {
81 .set_gpu_state = nouveau_switcheroo_set_state,
82 .reprobe = nouveau_switcheroo_reprobe,
83 .can_switch = nouveau_switcheroo_can_switch,
84 };
85
86 void
nouveau_vga_init(struct nouveau_drm * drm)87 nouveau_vga_init(struct nouveau_drm *drm)
88 {
89 struct drm_device *dev = drm->dev;
90 bool runtime = nouveau_pmops_runtime();
91 struct pci_dev *pdev;
92
93 /* only relevant for PCI devices */
94 if (!dev_is_pci(dev->dev))
95 return;
96 pdev = to_pci_dev(dev->dev);
97
98 vga_client_register(pdev, nouveau_vga_set_decode);
99
100 /* don't register Thunderbolt eGPU with vga_switcheroo */
101 if (pci_is_thunderbolt_attached(pdev))
102 return;
103
104 vga_switcheroo_register_client(pdev, &nouveau_switcheroo_ops, runtime);
105
106 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
107 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
108 }
109
110 void
nouveau_vga_fini(struct nouveau_drm * drm)111 nouveau_vga_fini(struct nouveau_drm *drm)
112 {
113 struct drm_device *dev = drm->dev;
114 bool runtime = nouveau_pmops_runtime();
115 struct pci_dev *pdev;
116
117 /* only relevant for PCI devices */
118 if (!dev_is_pci(dev->dev))
119 return;
120 pdev = to_pci_dev(dev->dev);
121
122 vga_client_unregister(pdev);
123
124 if (pci_is_thunderbolt_attached(pdev))
125 return;
126
127 vga_switcheroo_unregister_client(pdev);
128 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
129 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
130 }
131