drivers/gpu/drm/nouveau/nouveau_vga.c

   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                 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                 nouveau_switcheroo_optimus_dsm();
  54                 nouveau_pmops_suspend(&pdev->dev);
  55                 dev->switch_power_state = DRM_SWITCH_POWER_OFF;
  56         }
  57 }
  58
  59 static void
  60 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
  61 {
  62         struct drm_device *dev = pci_get_drvdata(pdev);
  63         drm_fb_helper_output_poll_changed(dev);
  64 }
  65
  66 static bool
  67 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
  68 {
  69         struct drm_device *dev = pci_get_drvdata(pdev);
  70
  71         /*
  72          * FIXME: open_count is protected by drm_global_mutex but that would lead to
  73          * locking inversion with the driver load path. And the access here is
  74          * completely racy anyway. So don't bother with locking for now.
  75          */
  76         return dev->open_count == 0;
  77 }
  78
  79 static const struct vga_switcheroo_client_ops
  80 nouveau_switcheroo_ops = {
  81         .set_gpu_state = nouveau_switcheroo_set_state,
  82         .reprobe = nouveau_switcheroo_reprobe,
  83         .can_switch = nouveau_switcheroo_can_switch,
  84 };
  85
  86 void
  87 nouveau_vga_init(struct nouveau_drm *drm)
  88 {
  89         struct drm_device *dev = drm->dev;
  90         bool runtime = nouveau_pmops_runtime();
  91
  92         /* only relevant for PCI devices */
  93         if (!dev->pdev)
  94                 return;
  95
  96         vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
  97
  98         /* don't register Thunderbolt eGPU with vga_switcheroo */
  99         if (pci_is_thunderbolt_attached(dev->pdev))
 100                 return;
 101
 102         vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
 103
 104         if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
 105                 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
 106 }
 107
 108 void
 109 nouveau_vga_fini(struct nouveau_drm *drm)
 110 {
 111         struct drm_device *dev = drm->dev;
 112         bool runtime = nouveau_pmops_runtime();
 113
 114         /* only relevant for PCI devices */
 115         if (!dev->pdev)
 116                 return;
 117
 118         vga_client_register(dev->pdev, NULL, NULL, NULL);
 119
 120         if (pci_is_thunderbolt_attached(dev->pdev))
 121                 return;
 122
 123         vga_switcheroo_unregister_client(dev->pdev);
 124         if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
 125                 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
 126 }
 127
 128
 129 void
 130 nouveau_vga_lastclose(struct drm_device *dev)
 131 {
 132         vga_switcheroo_process_delayed_switch();
 133 }