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 11 static unsigned int 12 nouveau_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 33 static void 34 nouveau_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 56 static void 57 nouveau_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 63 static bool 64 nouveau_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 76 static const struct vga_switcheroo_client_ops 77 nouveau_switcheroo_ops = { 78 .set_gpu_state = nouveau_switcheroo_set_state, 79 .reprobe = nouveau_switcheroo_reprobe, 80 .can_switch = nouveau_switcheroo_can_switch, 81 }; 82 83 void 84 nouveau_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 } 106 107 void 108 nouveau_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 } 128 129 130 void 131 nouveau_vga_lastclose(struct drm_device *dev) 132 { 133 vga_switcheroo_process_delayed_switch(); 134 } 135