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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include "xe_pm.h"
#include <linux/pm_runtime.h>
#include <drm/ttm/ttm_placement.h>
#include "xe_bo.h"
#include "xe_bo_evict.h"
#include "xe_device.h"
#include "xe_ggtt.h"
#include "xe_gt.h"
#include "xe_irq.h"
#include "xe_pcode.h"
/**
* DOC: Xe Power Management
*
* Xe PM shall be guided by the simplicity.
* Use the simplest hook options whenever possible.
* Let's not reinvent the runtime_pm references and hooks.
* Shall have a clear separation of display and gt underneath this component.
*
* What's next:
*
* For now s2idle and s3 are only working in integrated devices. The next step
* is to iterate through all VRAM's BO backing them up into the system memory
* before allowing the system suspend.
*
* Also runtime_pm needs to be here from the beginning.
*
* RC6/RPS are also critical PM features. Let's start with GuCRC and GuC SLPC
* and no wait boost. Frequency optimizations should come on a next stage.
*/
/**
* xe_pm_suspend - Helper for System suspend, i.e. S0->S3 / S0->S2idle
* @xe: xe device instance
*
* Return: 0 on success
*/
int xe_pm_suspend(struct xe_device *xe)
{
struct xe_gt *gt;
u8 id;
int err;
for_each_gt(gt, xe, id)
xe_gt_suspend_prepare(gt);
/* FIXME: Super racey... */
err = xe_bo_evict_all(xe);
if (err)
return err;
for_each_gt(gt, xe, id) {
err = xe_gt_suspend(gt);
if (err)
return err;
}
xe_irq_suspend(xe);
return 0;
}
/**
* xe_pm_resume - Helper for System resume S3->S0 / S2idle->S0
* @xe: xe device instance
*
* Return: 0 on success
*/
int xe_pm_resume(struct xe_device *xe)
{
struct xe_gt *gt;
u8 id;
int err;
for_each_gt(gt, xe, id) {
err = xe_pcode_init(gt);
if (err)
return err;
}
/*
* This only restores pinned memory which is the memory required for the
* GT(s) to resume.
*/
err = xe_bo_restore_kernel(xe);
if (err)
return err;
xe_irq_resume(xe);
for_each_gt(gt, xe, id)
xe_gt_resume(gt);
err = xe_bo_restore_user(xe);
if (err)
return err;
return 0;
}
void xe_pm_runtime_init(struct xe_device *xe)
{
struct device *dev = xe->drm.dev;
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, 1000);
pm_runtime_set_active(dev);
pm_runtime_allow(dev);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
void xe_pm_runtime_fini(struct xe_device *xe)
{
struct device *dev = xe->drm.dev;
pm_runtime_get_sync(dev);
pm_runtime_forbid(dev);
}
int xe_pm_runtime_suspend(struct xe_device *xe)
{
struct xe_gt *gt;
u8 id;
int err;
if (xe->d3cold_allowed) {
if (xe_device_mem_access_ongoing(xe))
return -EBUSY;
err = xe_bo_evict_all(xe);
if (err)
return err;
}
for_each_gt(gt, xe, id) {
err = xe_gt_suspend(gt);
if (err)
return err;
}
xe_irq_suspend(xe);
return 0;
}
int xe_pm_runtime_resume(struct xe_device *xe)
{
struct xe_gt *gt;
u8 id;
int err;
if (xe->d3cold_allowed) {
for_each_gt(gt, xe, id) {
err = xe_pcode_init(gt);
if (err)
return err;
}
/*
* This only restores pinned memory which is the memory
* required for the GT(s) to resume.
*/
err = xe_bo_restore_kernel(xe);
if (err)
return err;
}
xe_irq_resume(xe);
for_each_gt(gt, xe, id)
xe_gt_resume(gt);
if (xe->d3cold_allowed) {
err = xe_bo_restore_user(xe);
if (err)
return err;
}
return 0;
}
int xe_pm_runtime_get(struct xe_device *xe)
{
return pm_runtime_get_sync(xe->drm.dev);
}
int xe_pm_runtime_put(struct xe_device *xe)
{
pm_runtime_mark_last_busy(xe->drm.dev);
return pm_runtime_put_autosuspend(xe->drm.dev);
}
/* Return true if resume operation happened and usage count was increased */
bool xe_pm_runtime_resume_if_suspended(struct xe_device *xe)
{
/* In case we are suspended we need to immediately wake up */
if (pm_runtime_suspended(xe->drm.dev))
return !pm_runtime_resume_and_get(xe->drm.dev);
return false;
}
int xe_pm_runtime_get_if_active(struct xe_device *xe)
{
WARN_ON(pm_runtime_suspended(xe->drm.dev));
return pm_runtime_get_if_active(xe->drm.dev, true);
}
void xe_pm_assert_unbounded_bridge(struct xe_device *xe)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
struct pci_dev *bridge = pci_upstream_bridge(pdev);
if (!bridge)
return;
if (!bridge->driver) {
drm_warn(&xe->drm, "unbounded parent pci bridge, device won't support any PM support.\n");
device_set_pm_not_required(&pdev->dev);
}
}
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