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