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}