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_fbcon.h" 11 #include "nouveau_vga.h" 12 13 static unsigned int 14 nouveau_vga_set_decode(void *priv, bool state) 15 { 16 struct nouveau_drm *drm = nouveau_drm(priv); 17 struct nvif_object *device = &drm->client.device.object; 18 19 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE && 20 drm->client.device.info.chipset >= 0x4c) 21 nvif_wr32(device, 0x088060, state); 22 else 23 if (drm->client.device.info.chipset >= 0x40) 24 nvif_wr32(device, 0x088054, state); 25 else 26 nvif_wr32(device, 0x001854, state); 27 28 if (state) 29 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM | 30 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 31 else 32 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 33 } 34 35 static void 36 nouveau_switcheroo_set_state(struct pci_dev *pdev, 37 enum vga_switcheroo_state state) 38 { 39 struct drm_device *dev = pci_get_drvdata(pdev); 40 41 if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF) 42 return; 43 44 if (state == VGA_SWITCHEROO_ON) { 45 pr_err("VGA switcheroo: switched nouveau on\n"); 46 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING; 47 nouveau_pmops_resume(&pdev->dev); 48 dev->switch_power_state = DRM_SWITCH_POWER_ON; 49 } else { 50 pr_err("VGA switcheroo: switched nouveau off\n"); 51 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING; 52 nouveau_switcheroo_optimus_dsm(); 53 nouveau_pmops_suspend(&pdev->dev); 54 dev->switch_power_state = DRM_SWITCH_POWER_OFF; 55 } 56 } 57 58 static void 59 nouveau_switcheroo_reprobe(struct pci_dev *pdev) 60 { 61 struct drm_device *dev = pci_get_drvdata(pdev); 62 drm_fb_helper_output_poll_changed(dev); 63 } 64 65 static bool 66 nouveau_switcheroo_can_switch(struct pci_dev *pdev) 67 { 68 struct drm_device *dev = pci_get_drvdata(pdev); 69 70 /* 71 * FIXME: open_count is protected by drm_global_mutex but that would lead to 72 * locking inversion with the driver load path. And the access here is 73 * completely racy anyway. So don't bother with locking for now. 74 */ 75 return atomic_read(&dev->open_count) == 0; 76 } 77 78 static const struct vga_switcheroo_client_ops 79 nouveau_switcheroo_ops = { 80 .set_gpu_state = nouveau_switcheroo_set_state, 81 .reprobe = nouveau_switcheroo_reprobe, 82 .can_switch = nouveau_switcheroo_can_switch, 83 }; 84 85 void 86 nouveau_vga_init(struct nouveau_drm *drm) 87 { 88 struct drm_device *dev = drm->dev; 89 bool runtime = nouveau_pmops_runtime(); 90 struct pci_dev *pdev; 91 92 /* only relevant for PCI devices */ 93 if (!dev_is_pci(dev->dev)) 94 return; 95 pdev = to_pci_dev(dev->dev); 96 97 vga_client_register(pdev, dev, NULL, nouveau_vga_set_decode); 98 99 /* don't register Thunderbolt eGPU with vga_switcheroo */ 100 if (pci_is_thunderbolt_attached(pdev)) 101 return; 102 103 vga_switcheroo_register_client(pdev, &nouveau_switcheroo_ops, runtime); 104 105 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 106 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain); 107 } 108 109 void 110 nouveau_vga_fini(struct nouveau_drm *drm) 111 { 112 struct drm_device *dev = drm->dev; 113 bool runtime = nouveau_pmops_runtime(); 114 struct pci_dev *pdev; 115 116 /* only relevant for PCI devices */ 117 if (!dev_is_pci(dev->dev)) 118 return; 119 pdev = to_pci_dev(dev->dev); 120 121 vga_client_register(pdev, NULL, NULL, NULL); 122 123 if (pci_is_thunderbolt_attached(pdev)) 124 return; 125 126 vga_switcheroo_unregister_client(pdev); 127 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 128 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev); 129 } 130 131 132 void 133 nouveau_vga_lastclose(struct drm_device *dev) 134 { 135 vga_switcheroo_process_delayed_switch(); 136 } 137