// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */

#include <linux/jiffies.h>

#include "i915_timer_util.h"

void cancel_timer(struct timeout *t)
{
        if (!timer_active(t))
                return;

        timer_delete(t);
        WRITE_ONCE(t->to_time, 0);
}

void set_timer_ms(struct timeout *t, unsigned long timeout)
{
        if (!timeout) {
                cancel_timer(t);
                return;
        }

        timeout = msecs_to_jiffies(timeout);

        /*
         * Paranoia to make sure the compiler computes the timeout before
         * loading 'jiffies' as jiffies is volatile and may be updated in
         * the background by a timer tick. All to reduce the complexity
         * of the addition and reduce the risk of losing a jiffy.
         */
        barrier();

        /* Keep t->expires = 0 reserved to indicate a canceled timer. */
        mod_timer(t, jiffies + timeout ?: 1);
}