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 91 /* only relevant for PCI devices */ 92 if (!dev->pdev) 93 return; 94 95 vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode); 96 97 /* don't register Thunderbolt eGPU with vga_switcheroo */ 98 if (pci_is_thunderbolt_attached(dev->pdev)) 99 return; 100 101 vga_switcheroo_register_client(dev->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(); 112 113 /* only relevant for PCI devices */ 114 if (!dev->pdev) 115 return; 116 117 vga_client_register(dev->pdev, NULL, NULL, NULL); 118 119 if (pci_is_thunderbolt_attached(dev->pdev)) 120 return; 121 122 vga_switcheroo_unregister_client(dev->pdev); 123 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 124 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev); 125 } 126 127 128 void 129 nouveau_vga_lastclose(struct drm_device *dev) 130 { 131 vga_switcheroo_process_delayed_switch(); 132 } 133