LXR linux/drivers/gpu/drm/nouveau/nouveau

   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
  13static unsigned int
  14nouveau_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
  35static void
  36nouveau_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
  58static void
  59nouveau_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
  65static bool
  66nouveau_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
  78static const struct vga_switcheroo_client_ops
  79nouveau_switcheroo_ops = {
  80        .set_gpu_state = nouveau_switcheroo_set_state,
  81        .reprobe = nouveau_switcheroo_reprobe,
  82        .can_switch = nouveau_switcheroo_can_switch,
  83};
  84
  85void
  86nouveau_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
 107void
 108nouveau_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
 128void
 129nouveau_vga_lastclose(struct drm_device *dev)
 130{
 131        vga_switcheroo_process_delayed_switch();
 132}
 133