95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2019 Linus Walleij <linus.walleij@linaro.org>
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*/
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#ifndef LTP_IOPRIO_H
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#define LTP_IOPRIO_H
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enum {
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IOPRIO_CLASS_NONE = 0,
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IOPRIO_CLASS_RT,
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IOPRIO_CLASS_BE,
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IOPRIO_CLASS_IDLE,
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};
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enum {
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IOPRIO_WHO_PROCESS = 1,
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IOPRIO_WHO_PGRP,
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IOPRIO_WHO_USER,
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};
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/* The I/O scheduler classes have 8 priorities 0..7 except for the IDLE class */
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#define IOPRIO_PRIO_NUM 8
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#define IOPRIO_CLASS_SHIFT (13)
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#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
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#define IOPRIO_PRIO_CLASS(data) ((data) >> IOPRIO_CLASS_SHIFT)
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#define IOPRIO_PRIO_LEVEL(data) ((data) & IOPRIO_PRIO_MASK)
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#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
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static const char * const to_class_str[] = {
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[IOPRIO_CLASS_NONE] = "NONE",
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[IOPRIO_CLASS_RT] = "REALTIME",
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[IOPRIO_CLASS_BE] = "BEST-EFFORT",
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[IOPRIO_CLASS_IDLE] = "IDLE"
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};
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static inline int sys_ioprio_get(int which, int who)
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{
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return tst_syscall(__NR_ioprio_get, which, who);
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}
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static inline int sys_ioprio_set(int which, int who, int ioprio)
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{
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return tst_syscall(__NR_ioprio_set, which, who, ioprio);
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}
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/* Priority range from 0 (highest) to 7 (lowest) */
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static inline int prio_in_range(int prio)
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{
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if ((prio < 0) || (prio > 7))
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return 0;
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return 1;
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}
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/* Priority range from 0 to 3 using the enum */
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static inline int class_in_range(int class)
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{
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if ((class < IOPRIO_CLASS_NONE) || (class > IOPRIO_CLASS_IDLE))
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return 0;
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return 1;
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}
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static inline void ioprio_check_setting(int class, int prio, int report)
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{
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int res;
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int newclass, newprio;
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res = sys_ioprio_get(IOPRIO_WHO_PROCESS, 0);
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if (res == -1) {
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tst_res(TFAIL | TTERRNO,
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"reading back prio failed");
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return;
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}
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newclass = IOPRIO_PRIO_CLASS(res);
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newprio = IOPRIO_PRIO_LEVEL(res);
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if (newclass != class)
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tst_res(TFAIL,
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"wrong class after setting, expected %s got %s",
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to_class_str[class],
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to_class_str[newclass]);
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else if (newprio != prio)
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tst_res(TFAIL,
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"wrong prio after setting, expected %d got %d",
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prio, newprio);
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else if (report)
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tst_res(TPASS, "ioprio_set new class %s, new prio %d",
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to_class_str[newclass],
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newprio);
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}
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#endif
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