1// SPDX-License-Identifier: MIT
2#include <linux/vgaarb.h>
3#include <linux/vga_switcheroo.h>
4
5#include <drm/drm_fb_helper.h>
6
7#include "nouveau_drv.h"
8#include "nouveau_acpi.h"
9#include "nouveau_vga.h"
10
11static unsigned int
12nouveau_vga_set_decode(struct pci_dev *pdev, bool state)
13{
14	struct nouveau_drm *drm = nouveau_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
33static void
34nouveau_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		pr_err("VGA switcheroo: switched nouveau on\n");
44		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
45		nouveau_pmops_resume(&pdev->dev);
46		dev->switch_power_state = DRM_SWITCH_POWER_ON;
47	} else {
48		pr_err("VGA switcheroo: switched nouveau off\n");
49		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
50		nouveau_switcheroo_optimus_dsm();
51		nouveau_pmops_suspend(&pdev->dev);
52		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
53	}
54}
55
56static void
57nouveau_switcheroo_reprobe(struct pci_dev *pdev)
58{
59	struct drm_device *dev = pci_get_drvdata(pdev);
60	drm_fb_helper_output_poll_changed(dev);
61}
62
63static bool
64nouveau_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 atomic_read(&dev->open_count) == 0;
74}
75
76static const struct vga_switcheroo_client_ops
77nouveau_switcheroo_ops = {
78	.set_gpu_state = nouveau_switcheroo_set_state,
79	.reprobe = nouveau_switcheroo_reprobe,
80	.can_switch = nouveau_switcheroo_can_switch,
81};
82
83void
84nouveau_vga_init(struct nouveau_drm *drm)
85{
86	struct drm_device *dev = drm->dev;
87	bool runtime = nouveau_pmops_runtime();
88	struct pci_dev *pdev;
89
90	/* only relevant for PCI devices */
91	if (!dev_is_pci(dev->dev))
92		return;
93	pdev = to_pci_dev(dev->dev);
94
95	vga_client_register(pdev, nouveau_vga_set_decode);
96
97	/* don't register Thunderbolt eGPU with vga_switcheroo */
98	if (pci_is_thunderbolt_attached(pdev))
99		return;
100
101	vga_switcheroo_register_client(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
107void
108nouveau_vga_fini(struct nouveau_drm *drm)
109{
110	struct drm_device *dev = drm->dev;
111	bool runtime = nouveau_pmops_runtime();
112	struct pci_dev *pdev;
113
114	/* only relevant for PCI devices */
115	if (!dev_is_pci(dev->dev))
116		return;
117	pdev = to_pci_dev(dev->dev);
118
119	vga_client_unregister(pdev);
120
121	if (pci_is_thunderbolt_attached(pdev))
122		return;
123
124	vga_switcheroo_unregister_client(pdev);
125	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
126		vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
127}
128
129
130void
131nouveau_vga_lastclose(struct drm_device *dev)
132{
133	vga_switcheroo_process_delayed_switch();
134}
135