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                 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 }