nouveau_vga.c

  1// SPDX-License-Identifier: MIT
  2#include <linux/vgaarb.h>
  3#include <linux/vga_switcheroo.h>
  4
  5#include <drm/drm_client_event.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 = 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 nouveau_drm *drm = pci_get_drvdata(pdev);
 38	struct drm_device *dev = drm->dev;
 39
 40	if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
 41		return;
 42
 43	if (state == VGA_SWITCHEROO_ON) {
 44		pr_err("VGA switcheroo: switched nouveau on\n");
 45		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
 46		nouveau_pmops_resume(&pdev->dev);
 47		dev->switch_power_state = DRM_SWITCH_POWER_ON;
 48	} else {
 49		pr_err("VGA switcheroo: switched nouveau off\n");
 50		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
 51		nouveau_switcheroo_optimus_dsm();
 52		nouveau_pmops_suspend(&pdev->dev);
 53		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
 54	}
 55}
 56
 57static void
 58nouveau_switcheroo_reprobe(struct pci_dev *pdev)
 59{
 60	struct nouveau_drm *drm = pci_get_drvdata(pdev);
 61	struct drm_device *dev = drm->dev;
 62
 63	drm_client_dev_hotplug(dev);
 64}
 65
 66static bool
 67nouveau_switcheroo_can_switch(struct pci_dev *pdev)
 68{
 69	struct nouveau_drm *drm = 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 atomic_read(&drm->dev->open_count) == 0;
 77}
 78
 79static const struct vga_switcheroo_client_ops
 80nouveau_switcheroo_ops = {
 81	.set_gpu_state = nouveau_switcheroo_set_state,
 82	.reprobe = nouveau_switcheroo_reprobe,
 83	.can_switch = nouveau_switcheroo_can_switch,
 84};
 85
 86void
 87nouveau_vga_init(struct nouveau_drm *drm)
 88{
 89	struct drm_device *dev = drm->dev;
 90	bool runtime = nouveau_pmops_runtime();
 91	struct pci_dev *pdev;
 92
 93	/* only relevant for PCI devices */
 94	if (!dev_is_pci(dev->dev))
 95		return;
 96	pdev = to_pci_dev(dev->dev);
 97
 98	vga_client_register(pdev, nouveau_vga_set_decode);
 99
100	/* don't register Thunderbolt eGPU with vga_switcheroo */
101	if (pci_is_thunderbolt_attached(pdev))
102		return;
103
104	vga_switcheroo_register_client(pdev, &nouveau_switcheroo_ops, runtime);
105
106	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
107		vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
108}
109
110void
111nouveau_vga_fini(struct nouveau_drm *drm)
112{
113	struct drm_device *dev = drm->dev;
114	bool runtime = nouveau_pmops_runtime();
115	struct pci_dev *pdev;
116
117	/* only relevant for PCI devices */
118	if (!dev_is_pci(dev->dev))
119		return;
120	pdev = to_pci_dev(dev->dev);
121
122	vga_client_unregister(pdev);
123
124	if (pci_is_thunderbolt_attached(pdev))
125		return;
126
127	vga_switcheroo_unregister_client(pdev);
128	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
129		vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
130}