1 // SPDX-License-Identifier: MIT
2 #include <linux/vgaarb.h>
3 #include <linux/vga_switcheroo.h>
4
5 #include <drm/drm_crtc_helper.h>
6 #include <drm/drm_fb_helper.h>
7
8 #include "nouveau_drv.h"
9 #include "nouveau_acpi.h"
10 #include "nouveau_fbcon.h"
11 #include "nouveau_vga.h"
12
13 static unsigned int
nouveau_vga_set_decode(void * priv,bool state)14 nouveau_vga_set_decode(void *priv, bool state)
15 {
16 struct nouveau_drm *drm = nouveau_drm(priv);
17 struct nvif_object *device = &drm->client.device.object;
18
19 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE &&
20 drm->client.device.info.chipset >= 0x4c)
21 nvif_wr32(device, 0x088060, state);
22 else
23 if (drm->client.device.info.chipset >= 0x40)
24 nvif_wr32(device, 0x088054, state);
25 else
26 nvif_wr32(device, 0x001854, state);
27
28 if (state)
29 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
30 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
31 else
32 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
33 }
34
35 static void
nouveau_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)36 nouveau_switcheroo_set_state(struct pci_dev *pdev,
37 enum vga_switcheroo_state state)
38 {
39 struct drm_device *dev = pci_get_drvdata(pdev);
40
41 if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
42 return;
43
44 if (state == VGA_SWITCHEROO_ON) {
45 pr_err("VGA switcheroo: switched nouveau on\n");
46 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
47 nouveau_pmops_resume(&pdev->dev);
48 dev->switch_power_state = DRM_SWITCH_POWER_ON;
49 } else {
50 pr_err("VGA switcheroo: switched nouveau off\n");
51 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
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
nouveau_switcheroo_reprobe(struct pci_dev * pdev)59 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
60 {
61 struct drm_device *dev = pci_get_drvdata(pdev);
62 drm_fb_helper_output_poll_changed(dev);
63 }
64
65 static bool
nouveau_switcheroo_can_switch(struct pci_dev * pdev)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 atomic_read(&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
nouveau_vga_init(struct nouveau_drm * drm)86 nouveau_vga_init(struct nouveau_drm *drm)
87 {
88 struct drm_device *dev = drm->dev;
89 bool runtime = nouveau_pmops_runtime();
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 /* don't register Thunderbolt eGPU with vga_switcheroo */
98 if (pci_is_thunderbolt_attached(dev->pdev))
99 return;
100
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
nouveau_vga_fini(struct nouveau_drm * drm)108 nouveau_vga_fini(struct nouveau_drm *drm)
109 {
110 struct drm_device *dev = drm->dev;
111 bool runtime = nouveau_pmops_runtime();
112
113 /* only relevant for PCI devices */
114 if (!dev->pdev)
115 return;
116
117 vga_client_register(dev->pdev, NULL, NULL, NULL);
118
119 if (pci_is_thunderbolt_attached(dev->pdev))
120 return;
121
122 vga_switcheroo_unregister_client(dev->pdev);
123 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
124 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
125 }
126
127
128 void
nouveau_vga_lastclose(struct drm_device * dev)129 nouveau_vga_lastclose(struct drm_device *dev)
130 {
131 vga_switcheroo_process_delayed_switch();
132 }
133
