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 11 static unsigned int 12 nouveau_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 33 static void 34 nouveau_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 57 static void 58 nouveau_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 66 static bool 67 nouveau_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 79 static const struct vga_switcheroo_client_ops 80 nouveau_switcheroo_ops = { 81 .set_gpu_state = nouveau_switcheroo_set_state, 82 .reprobe = nouveau_switcheroo_reprobe, 83 .can_switch = nouveau_switcheroo_can_switch, 84 }; 85 86 void 87 nouveau_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 } 109 110 void 111 nouveau_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