drivers/gpu/drm/nouveau/nouveau_vga.c

   1 // SPDX-License-Identifier: MIT
   2 #include <linux/vgaarb.h>
   3 #include <linux/vga_switcheroo.h>
   4
   5 #include <drm/drm_fb_helper.h>
   6
   7 #include "nouveau_drv.h"
   8 #include "nouveau_acpi.h"
   9 #include "nouveau_vga.h"
  10
  11 static unsigned int
  12 nouveau_vga_set_decode(struct pci_dev *pdev, bool state)
  13 {
  14         struct nouveau_drm *drm = nouveau_drm(pci_get_drvdata(pdev));
  15         struct nvif_object *device = &drm->client.device.object;
  16
  17         if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE &&
  18             drm->client.device.info.chipset >= 0x4c)
  19                 nvif_wr32(device, 0x088060, state);
  20         else
  21         if (drm->client.device.info.chipset >= 0x40)
  22                 nvif_wr32(device, 0x088054, state);
  23         else
  24                 nvif_wr32(device, 0x001854, state);
  25
  26         if (state)
  27                 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
  28                        VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
  29         else
  30                 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
  31 }
  32
  33 static void
  34 nouveau_switcheroo_set_state(struct pci_dev *pdev,
  35                              enum vga_switcheroo_state state)
  36 {
  37         struct drm_device *dev = pci_get_drvdata(pdev);
  38
  39         if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
  40                 return;
  41
  42         if (state == VGA_SWITCHEROO_ON) {
  43                 pr_err("VGA switcheroo: switched nouveau on\n");
  44                 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
  45                 nouveau_pmops_resume(&pdev->dev);
  46                 dev->switch_power_state = DRM_SWITCH_POWER_ON;
  47         } else {
  48                 pr_err("VGA switcheroo: switched nouveau off\n");
  49                 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
  50                 nouveau_switcheroo_optimus_dsm();
  51                 nouveau_pmops_suspend(&pdev->dev);
  52                 dev->switch_power_state = DRM_SWITCH_POWER_OFF;
  53         }
  54 }
  55
  56 static void
  57 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
  58 {
  59         struct drm_device *dev = pci_get_drvdata(pdev);
  60         drm_fb_helper_output_poll_changed(dev);
  61 }
  62
  63 static bool
  64 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
  65 {
  66         struct drm_device *dev = pci_get_drvdata(pdev);
  67
  68         /*
  69          * FIXME: open_count is protected by drm_global_mutex but that would lead to
  70          * locking inversion with the driver load path. And the access here is
  71          * completely racy anyway. So don't bother with locking for now.
  72          */
  73         return atomic_read(&dev->open_count) == 0;
  74 }
  75
  76 static const struct vga_switcheroo_client_ops
  77 nouveau_switcheroo_ops = {
  78         .set_gpu_state = nouveau_switcheroo_set_state,
  79         .reprobe = nouveau_switcheroo_reprobe,
  80         .can_switch = nouveau_switcheroo_can_switch,
  81 };
  82
  83 void
  84 nouveau_vga_init(struct nouveau_drm *drm)
  85 {
  86         struct drm_device *dev = drm->dev;
  87         bool runtime = nouveau_pmops_runtime();
  88         struct pci_dev *pdev;
  89
  90         /* only relevant for PCI devices */
  91         if (!dev_is_pci(dev->dev))
  92                 return;
  93         pdev = to_pci_dev(dev->dev);
  94
  95         vga_client_register(pdev, nouveau_vga_set_decode);
  96
  97         /* don't register Thunderbolt eGPU with vga_switcheroo */
  98         if (pci_is_thunderbolt_attached(pdev))
  99                 return;
 100
 101         vga_switcheroo_register_client(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         struct pci_dev *pdev;
 113
 114         /* only relevant for PCI devices */
 115         if (!dev_is_pci(dev->dev))
 116                 return;
 117         pdev = to_pci_dev(dev->dev);
 118
 119         vga_client_unregister(pdev);
 120
 121         if (pci_is_thunderbolt_attached(pdev))
 122                 return;
 123
 124         vga_switcheroo_unregister_client(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 }