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/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
  14static unsigned int
  15nouveau_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
  36static void
  37nouveau_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
  59static void
  60nouveau_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
  66static bool
  67nouveau_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
  79static const struct vga_switcheroo_client_ops
  80nouveau_switcheroo_ops = {
  81        .set_gpu_state = nouveau_switcheroo_set_state,
  82        .reprobe = nouveau_switcheroo_reprobe,
  83        .can_switch = nouveau_switcheroo_can_switch,
  84};
  85
  86void
  87nouveau_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
 108void
 109nouveau_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
 129void
 130nouveau_vga_lastclose(struct drm_device *dev)
 131{
 132        vga_switcheroo_process_delayed_switch();
 133}
 134