1 // SPDX-License-Identifier: MIT 2 #include <linux/vgaarb.h> 3 #include <linux/vga_switcheroo.h> 4 5 #include <drm/drm_crtc_helper.h> 6 #include <drm/drm_fb_helper.h> 7 8 #include "nouveau_drv.h" 9 #include "nouveau_acpi.h" 10 #include "nouveau_vga.h" 11 12 static unsigned int 13 nouveau_vga_set_decode(struct pci_dev *pdev, bool state) 14 { 15 struct nouveau_drm *drm = nouveau_drm(pci_get_drvdata(pdev)); 16 struct nvif_object *device = &drm->client.device.object; 17 18 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE && 19 drm->client.device.info.chipset >= 0x4c) 20 nvif_wr32(device, 0x088060, state); 21 else 22 if (drm->client.device.info.chipset >= 0x40) 23 nvif_wr32(device, 0x088054, state); 24 else 25 nvif_wr32(device, 0x001854, state); 26 27 if (state) 28 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM | 29 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 30 else 31 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 32 } 33 34 static void 35 nouveau_switcheroo_set_state(struct pci_dev *pdev, 36 enum vga_switcheroo_state state) 37 { 38 struct drm_device *dev = pci_get_drvdata(pdev); 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 drm_device *dev = pci_get_drvdata(pdev); 61 drm_fb_helper_output_poll_changed(dev); 62 } 63 64 static bool 65 nouveau_switcheroo_can_switch(struct pci_dev *pdev) 66 { 67 struct drm_device *dev = pci_get_drvdata(pdev); 68 69 /* 70 * FIXME: open_count is protected by drm_global_mutex but that would lead to 71 * locking inversion with the driver load path. And the access here is 72 * completely racy anyway. So don't bother with locking for now. 73 */ 74 return atomic_read(&dev->open_count) == 0; 75 } 76 77 static const struct vga_switcheroo_client_ops 78 nouveau_switcheroo_ops = { 79 .set_gpu_state = nouveau_switcheroo_set_state, 80 .reprobe = nouveau_switcheroo_reprobe, 81 .can_switch = nouveau_switcheroo_can_switch, 82 }; 83 84 void 85 nouveau_vga_init(struct nouveau_drm *drm) 86 { 87 struct drm_device *dev = drm->dev; 88 bool runtime = nouveau_pmops_runtime(); 89 struct pci_dev *pdev; 90 91 /* only relevant for PCI devices */ 92 if (!dev_is_pci(dev->dev)) 93 return; 94 pdev = to_pci_dev(dev->dev); 95 96 vga_client_register(pdev, nouveau_vga_set_decode); 97 98 /* don't register Thunderbolt eGPU with vga_switcheroo */ 99 if (pci_is_thunderbolt_attached(pdev)) 100 return; 101 102 vga_switcheroo_register_client(pdev, &nouveau_switcheroo_ops, runtime); 103 104 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 105 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain); 106 } 107 108 void 109 nouveau_vga_fini(struct nouveau_drm *drm) 110 { 111 struct drm_device *dev = drm->dev; 112 bool runtime = nouveau_pmops_runtime(); 113 struct pci_dev *pdev; 114 115 /* only relevant for PCI devices */ 116 if (!dev_is_pci(dev->dev)) 117 return; 118 pdev = to_pci_dev(dev->dev); 119 120 vga_client_unregister(pdev); 121 122 if (pci_is_thunderbolt_attached(pdev)) 123 return; 124 125 vga_switcheroo_unregister_client(pdev); 126 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 127 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev); 128 } 129 130 131 void 132 nouveau_vga_lastclose(struct drm_device *dev) 133 { 134 vga_switcheroo_process_delayed_switch(); 135 } 136