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1// SPDX-License-Identifier: MIT2#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 int12nouveau_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 else21 if (drm->client.device.info.chipset >= 0x40)22 nvif_wr32(device, 0x088054, state);23 else24 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 else30 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;31}32 33static void34nouveau_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 void58nouveau_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 bool67nouveau_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 to73 * locking inversion with the driver load path. And the access here is74 * 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_ops80nouveau_switcheroo_ops = {81 .set_gpu_state = nouveau_switcheroo_set_state,82 .reprobe = nouveau_switcheroo_reprobe,83 .can_switch = nouveau_switcheroo_can_switch,84};85 86void87nouveau_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 110void111nouveau_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}131