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 #include <drm/drm_fb_helper.h> 8 9 #include "nouveau_drv.h" 10 #include "nouveau_acpi.h" 11 #include "nouveau_fbcon.h" 12 #include "nouveau_vga.h" 13 14 static unsigned int 15 nouveau_vga_set_decode(void *priv, bool state) 16 { 17 struct nouveau_drm *drm = nouveau_drm(priv); 18 struct nvif_object *device = &drm->client.device.object; 19 20 if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE && 21 drm->client.device.info.chipset >= 0x4c) 22 nvif_wr32(device, 0x088060, state); 23 else 24 if (drm->client.device.info.chipset >= 0x40) 25 nvif_wr32(device, 0x088054, state); 26 else 27 nvif_wr32(device, 0x001854, state); 28 29 if (state) 30 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM | 31 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 32 else 33 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 34 } 35 36 static void 37 nouveau_switcheroo_set_state(struct pci_dev *pdev, 38 enum vga_switcheroo_state state) 39 { 40 struct drm_device *dev = pci_get_drvdata(pdev); 41 42 if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF) 43 return; 44 45 if (state == VGA_SWITCHEROO_ON) { 46 pr_err("VGA switcheroo: switched nouveau on\n"); 47 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING; 48 nouveau_pmops_resume(&pdev->dev); 49 drm_kms_helper_poll_enable(dev); 50 dev->switch_power_state = DRM_SWITCH_POWER_ON; 51 } else { 52 pr_err("VGA switcheroo: switched nouveau off\n"); 53 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING; 54 drm_kms_helper_poll_disable(dev); 55 nouveau_switcheroo_optimus_dsm(); 56 nouveau_pmops_suspend(&pdev->dev); 57 dev->switch_power_state = DRM_SWITCH_POWER_OFF; 58 } 59 } 60 61 static void 62 nouveau_switcheroo_reprobe(struct pci_dev *pdev) 63 { 64 struct drm_device *dev = pci_get_drvdata(pdev); 65 drm_fb_helper_output_poll_changed(dev); 66 } 67 68 static bool 69 nouveau_switcheroo_can_switch(struct pci_dev *pdev) 70 { 71 struct drm_device *dev = pci_get_drvdata(pdev); 72 73 /* 74 * FIXME: open_count is protected by drm_global_mutex but that would lead to 75 * locking inversion with the driver load path. And the access here is 76 * completely racy anyway. So don't bother with locking for now. 77 */ 78 return dev->open_count == 0; 79 } 80 81 static const struct vga_switcheroo_client_ops 82 nouveau_switcheroo_ops = { 83 .set_gpu_state = nouveau_switcheroo_set_state, 84 .reprobe = nouveau_switcheroo_reprobe, 85 .can_switch = nouveau_switcheroo_can_switch, 86 }; 87 88 void 89 nouveau_vga_init(struct nouveau_drm *drm) 90 { 91 struct drm_device *dev = drm->dev; 92 bool runtime = nouveau_pmops_runtime(); 93 94 /* only relevant for PCI devices */ 95 if (!dev->pdev) 96 return; 97 98 vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode); 99 100 /* don't register Thunderbolt eGPU with vga_switcheroo */ 101 if (pci_is_thunderbolt_attached(dev->pdev)) 102 return; 103 104 vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime); 105 106 if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus()) 107 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain); 108 } 109 110 void 111 nouveau_vga_fini(struct nouveau_drm *drm) 112 { 113 struct drm_device *dev = drm->dev; 114 bool runtime = nouveau_pmops_runtime(); 115 116 /* only relevant for PCI devices */ 117 if (!dev->pdev) 118 return; 119 120 vga_client_register(dev->pdev, NULL, NULL, NULL); 121 122 if (pci_is_thunderbolt_attached(dev->pdev)) 123 return; 124 125 vga_switcheroo_unregister_client(dev->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