diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_pm.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_pm.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c new file mode 100644 index 000000000000..fb0355530e7b --- /dev/null +++ b/drivers/gpu/drm/xe/xe_pm.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#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_pm.h" +#include "xe_gt.h" +#include "xe_ggtt.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); +} + +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); +} |