| /* SPDX-License-Identifier: MIT */ |
| /* |
| * Copyright © 2026 Intel Corporation |
| */ |
| |
| #ifndef _XE_SLEEP_H_ |
| #define _XE_SLEEP_H_ |
| |
| #include <linux/delay.h> |
| #include <linux/math64.h> |
| |
| /** |
| * xe_sleep_relaxed_ms() - Sleep for an approximate time. |
| * @delay_ms: time in msec to sleep |
| * |
| * For smaller timeouts, sleep with 0.5ms accuracy. |
| */ |
| static inline void xe_sleep_relaxed_ms(unsigned int delay_ms) |
| { |
| unsigned long min_us, max_us; |
| |
| if (!delay_ms) |
| return; |
| |
| if (delay_ms > 20) { |
| msleep(delay_ms); |
| return; |
| } |
| |
| min_us = mul_u32_u32(delay_ms, 1000); |
| max_us = min_us + 500; |
| |
| usleep_range(min_us, max_us); |
| } |
| |
| /** |
| * xe_sleep_exponential_ms() - Sleep for a exponentially increased time. |
| * @sleep_period_ms: current time in msec to sleep |
| * @max_sleep_ms: maximum time in msec to sleep |
| * |
| * Sleep for the @sleep_period_ms and exponentially increase this time for the |
| * next loop, unless reaching the @max_sleep_ms limit. |
| * |
| * Return: approximate time in msec the task was delayed. |
| */ |
| static inline unsigned int xe_sleep_exponential_ms(unsigned int *sleep_period_ms, |
| unsigned int max_sleep_ms) |
| { |
| unsigned int delay_ms = *sleep_period_ms; |
| unsigned int next_delay_ms = 2 * delay_ms; |
| |
| xe_sleep_relaxed_ms(delay_ms); |
| *sleep_period_ms = min(next_delay_ms, max_sleep_ms); |
| return delay_ms; |
| } |
| |
| #endif |
