cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nouveau_vga.c (3625B)


      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(struct pci_dev *pdev, bool state)
     15{
     16	struct nouveau_drm *drm = nouveau_drm(pci_get_drvdata(pdev));
     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	struct pci_dev *pdev;
     91
     92	/* only relevant for PCI devices */
     93	if (!dev_is_pci(dev->dev))
     94		return;
     95	pdev = to_pci_dev(dev->dev);
     96
     97	vga_client_register(pdev, nouveau_vga_set_decode);
     98
     99	/* don't register Thunderbolt eGPU with vga_switcheroo */
    100	if (pci_is_thunderbolt_attached(pdev))
    101		return;
    102
    103	vga_switcheroo_register_client(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
    109void
    110nouveau_vga_fini(struct nouveau_drm *drm)
    111{
    112	struct drm_device *dev = drm->dev;
    113	bool runtime = nouveau_pmops_runtime();
    114	struct pci_dev *pdev;
    115
    116	/* only relevant for PCI devices */
    117	if (!dev_is_pci(dev->dev))
    118		return;
    119	pdev = to_pci_dev(dev->dev);
    120
    121	vga_client_unregister(pdev);
    122
    123	if (pci_is_thunderbolt_attached(pdev))
    124		return;
    125
    126	vga_switcheroo_unregister_client(pdev);
    127	if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
    128		vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
    129}
    130
    131
    132void
    133nouveau_vga_lastclose(struct drm_device *dev)
    134{
    135	vga_switcheroo_process_delayed_switch();
    136}