1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/vgaarb.h>
3 #include <linux/vga_switcheroo.h>
4
5 #include <drm/drmP.h>
6 #include <drm/drm_crtc_helper.h>
7 #include <drm/drm_fb_helper.h>
8
9 #include "nouveau_drv.h"
10 #include "nouveau_acpi.h"
11 #include "nouveau_fbcon.h"
12 #include "nouveau_vga.h"
13
14 static unsigned int
nouveau_vga_set_decode(void * priv,bool state)15 nouveau_vga_set_decode(void *priv, bool state)
16 {
17 struct nouveau_drm *drm = nouveau_drm(priv);
18 struct nvif_object *device = &drm->client.device.object;
19
20 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE &&
21 drm->client.device.info.chipset >= 0x4c)
22 nvif_wr32(device, 0x088060, state);
23 else
24 if (drm->client.device.info.chipset >= 0x40)
25 nvif_wr32(device, 0x088054, state);
26 else
27 nvif_wr32(device, 0x001854, state);
28
29 if (state)
30 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
31 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
32 else
33 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
34 }
35
36 static void
nouveau_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)37 nouveau_switcheroo_set_state(struct pci_dev *pdev,
38 enum vga_switcheroo_state state)
39 {
40 struct drm_device *dev = pci_get_drvdata(pdev);
41
42 if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
43 return;
44
45 if (state == VGA_SWITCHEROO_ON) {
46 pr_err("VGA switcheroo: switched nouveau on\n");
47 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
48 nouveau_pmops_resume(&pdev->dev);
49 dev->switch_power_state = DRM_SWITCH_POWER_ON;
50 } else {
51 pr_err("VGA switcheroo: switched nouveau off\n");
52 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
53 nouveau_switcheroo_optimus_dsm();
54 nouveau_pmops_suspend(&pdev->dev);
55 dev->switch_power_state = DRM_SWITCH_POWER_OFF;
56 }
57 }
58
59 static void
nouveau_switcheroo_reprobe(struct pci_dev * pdev)60 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
61 {
62 struct drm_device *dev = pci_get_drvdata(pdev);
63 drm_fb_helper_output_poll_changed(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 drm_device *dev = 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 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
92 /* only relevant for PCI devices */
93 if (!dev->pdev)
94 return;
95
96 vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
97
98 /* don't register Thunderbolt eGPU with vga_switcheroo */
99 if (pci_is_thunderbolt_attached(dev->pdev))
100 return;
101
102 vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
103
104 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
105 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
106 }
107
108 void
nouveau_vga_fini(struct nouveau_drm * drm)109 nouveau_vga_fini(struct nouveau_drm *drm)
110 {
111 struct drm_device *dev = drm->dev;
112 bool runtime = nouveau_pmops_runtime();
113
114 /* only relevant for PCI devices */
115 if (!dev->pdev)
116 return;
117
118 vga_client_register(dev->pdev, NULL, NULL, NULL);
119
120 if (pci_is_thunderbolt_attached(dev->pdev))
121 return;
122
123 vga_switcheroo_unregister_client(dev->pdev);
124 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
125 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
126 }
127
128
129 void
nouveau_vga_lastclose(struct drm_device * dev)130 nouveau_vga_lastclose(struct drm_device *dev)
131 {
132 vga_switcheroo_process_delayed_switch();
133 }
134