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
13static unsigned int
14nouveau_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
35static void
36nouveau_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
58static void
59nouveau_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
65static bool
66nouveau_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
78static const struct vga_switcheroo_client_ops
79nouveau_switcheroo_ops = {
80	.set_gpu_state = nouveau_switcheroo_set_state,
81	.reprobe = nouveau_switcheroo_reprobe,
82	.can_switch = nouveau_switcheroo_can_switch,
83};
84
85void
86nouveau_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
107void
108nouveau_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
128void
129nouveau_vga_lastclose(struct drm_device *dev)
130{
131	vga_switcheroo_process_delayed_switch();
132}
133