1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/vgaarb.h> 3 #include <linux/vga_switcheroo.h> 4 5 #include <drm/drmP.h> 6 #include <drm/drm_crtc_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 drm_kms_helper_poll_enable(dev); 49 dev->switch_power_state = DRM_SWITCH_POWER_ON; 50 } else { 51 pr_err("VGA switcheroo: switched nouveau off\n"); 52 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING; 53 drm_kms_helper_poll_disable(dev); 54 nouveau_switcheroo_optimus_dsm(); 55 nouveau_pmops_suspend(&pdev->dev); 56 dev->switch_power_state = DRM_SWITCH_POWER_OFF; 57 } 58 } 59 60 static void 61 nouveau_switcheroo_reprobe(struct pci_dev *pdev) 62 { 63 struct drm_device *dev = pci_get_drvdata(pdev); 64 nouveau_fbcon_output_poll_changed(dev); 65 } 66 67 static bool 68 nouveau_switcheroo_can_switch(struct pci_dev *pdev) 69 { 70 struct drm_device *dev = pci_get_drvdata(pdev); 71 72 /* 73 * FIXME: open_count is protected by drm_global_mutex but that would lead to 74 * locking inversion with the driver load path. And the access here is 75 * completely racy anyway. So don't bother with locking for now. 76 */ 77 return dev->open_count == 0; 78 } 79 80 static const struct vga_switcheroo_client_ops 81 nouveau_switcheroo_ops = { 82 .set_gpu_state = nouveau_switcheroo_set_state, 83 .reprobe = nouveau_switcheroo_reprobe, 84 .can_switch = nouveau_switcheroo_can_switch, 85 }; 86 87 void 88 nouveau_vga_init(struct nouveau_drm *drm) 89 { 90 struct drm_device *dev = drm->dev; 91 bool runtime = nouveau_pmops_runtime(); 92 93 /* only relevant for PCI devices */ 94 if (!dev->pdev) 95 return; 96 97 vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode); 98 99 /* don't register Thunderbolt eGPU with vga_switcheroo */ 100 if (pci_is_thunderbolt_attached(dev->pdev)) 101 return; 102 103 vga_switcheroo_register_client(dev->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(); 114 115 /* only relevant for PCI devices */ 116 if (!dev->pdev) 117 return; 118 119 vga_client_register(dev->pdev, NULL, NULL, NULL); 120 121 if (pci_is_thunderbolt_attached(dev->pdev)) 122 return; 123 124 vga_switcheroo_unregister_client(dev->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