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}