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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 */