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_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 }