1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2019 Intel Corporation
4 */
5
6 #include <linux/vga_switcheroo.h>
7
8 #include "i915_driver.h"
9 #include "i915_drv.h"
10 #include "i915_switcheroo.h"
11
i915_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)12 static void i915_switcheroo_set_state(struct pci_dev *pdev,
13 enum vga_switcheroo_state state)
14 {
15 struct drm_i915_private *i915 = pdev_to_i915(pdev);
16 pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
17
18 if (!i915) {
19 dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n");
20 return;
21 }
22
23 if (state == VGA_SWITCHEROO_ON) {
24 drm_info(&i915->drm, "switched on\n");
25 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
26 /* i915 resume handler doesn't set to D0 */
27 pci_set_power_state(pdev, PCI_D0);
28 i915_driver_resume_switcheroo(i915);
29 i915->drm.switch_power_state = DRM_SWITCH_POWER_ON;
30 } else {
31 drm_info(&i915->drm, "switched off\n");
32 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
33 i915_driver_suspend_switcheroo(i915, pmm);
34 i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF;
35 }
36 }
37
i915_switcheroo_can_switch(struct pci_dev * pdev)38 static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
39 {
40 struct drm_i915_private *i915 = pdev_to_i915(pdev);
41
42 /*
43 * FIXME: open_count is protected by drm_global_mutex but that would lead to
44 * locking inversion with the driver load path. And the access here is
45 * completely racy anyway. So don't bother with locking for now.
46 */
47 return i915 && atomic_read(&i915->drm.open_count) == 0;
48 }
49
50 static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
51 .set_gpu_state = i915_switcheroo_set_state,
52 .reprobe = NULL,
53 .can_switch = i915_switcheroo_can_switch,
54 };
55
i915_switcheroo_register(struct drm_i915_private * i915)56 int i915_switcheroo_register(struct drm_i915_private *i915)
57 {
58 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
59
60 return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);
61 }
62
i915_switcheroo_unregister(struct drm_i915_private * i915)63 void i915_switcheroo_unregister(struct drm_i915_private *i915)
64 {
65 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
66
67 vga_switcheroo_unregister_client(pdev);
68 }
69