cputime.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * Definitions for measuring cputime on powerpc machines.
 4 *
 5 * Copyright (C) 2006 Paul Mackerras, IBM Corp.
 6 *
 7 * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
 8 * the same units as the timebase.  Otherwise we measure cpu time
 9 * in jiffies using the generic definitions.
10 */
11
12#ifndef __POWERPC_CPUTIME_H
13#define __POWERPC_CPUTIME_H
14
15#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
16
17#include <linux/types.h>
18#include <linux/time.h>
19#include <asm/div64.h>
20#include <asm/time.h>
21#include <asm/param.h>
22#include <asm/firmware.h>
23
24#ifdef __KERNEL__
25#define cputime_to_nsecs(cputime) tb_to_ns(cputime)
26
27/*
28 * PPC64 uses PACA which is task independent for storing accounting data while
29 * PPC32 uses struct thread_info, therefore at task switch the accounting data
30 * has to be populated in the new task
31 */
32#ifdef CONFIG_PPC64
33#define get_accounting(tsk)	(&get_paca()->accounting)
34#define raw_get_accounting(tsk)	(&local_paca->accounting)
35
36#else
37#define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
38#define raw_get_accounting(tsk)	get_accounting(tsk)
39#endif
40
41/*
42 * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
43 * can't use get_paca()
44 */
45static notrace inline void account_cpu_user_entry(void)
46{
47	unsigned long tb = mftb();
48	struct cpu_accounting_data *acct = raw_get_accounting(current);
49
50	acct->utime += (tb - acct->starttime_user);
51	acct->starttime = tb;
52}
53
54static notrace inline void account_cpu_user_exit(void)
55{
56	unsigned long tb = mftb();
57	struct cpu_accounting_data *acct = raw_get_accounting(current);
58
59	acct->stime += (tb - acct->starttime);
60	acct->starttime_user = tb;
61}
62
63static notrace inline void account_stolen_time(void)
64{
65#ifdef CONFIG_PPC_SPLPAR
66	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
67		struct lppaca *lp = local_paca->lppaca_ptr;
68
69		if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
70			pseries_accumulate_stolen_time();
71	}
72#endif
73}
74
75#endif /* __KERNEL__ */
76#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
77static inline void account_cpu_user_entry(void)
78{
79}
80static inline void account_cpu_user_exit(void)
81{
82}
83static notrace inline void account_stolen_time(void)
84{
85}
86#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
87#endif /* __POWERPC_CPUTIME_H */