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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
23typedef u64 __nocast cputime_t;
24typedef u64 __nocast cputime64_t;
25
26#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
27
28#ifdef __KERNEL__
29/*
30 * Convert cputime <-> microseconds
31 */
32extern u64 __cputime_usec_factor;
33
34static inline unsigned long cputime_to_usecs(const cputime_t ct)
35{
36 return mulhdu((__force u64) ct, __cputime_usec_factor);
37}
38
39#define cputime_to_nsecs(cputime) tb_to_ns((__force u64)cputime)
40
41/*
42 * PPC64 uses PACA which is task independent for storing accounting data while
43 * PPC32 uses struct thread_info, therefore at task switch the accounting data
44 * has to be populated in the new task
45 */
46#ifdef CONFIG_PPC64
47#define get_accounting(tsk) (&get_paca()->accounting)
48#define raw_get_accounting(tsk) (&local_paca->accounting)
49static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
50
51#else
52#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
53#define raw_get_accounting(tsk) get_accounting(tsk)
54/*
55 * Called from the context switch with interrupts disabled, to charge all
56 * accumulated times to the current process, and to prepare accounting on
57 * the next process.
58 */
59static inline void arch_vtime_task_switch(struct task_struct *prev)
60{
61 struct cpu_accounting_data *acct = get_accounting(current);
62 struct cpu_accounting_data *acct0 = get_accounting(prev);
63
64 acct->starttime = acct0->starttime;
65}
66#endif
67
68/*
69 * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
70 * can't use get_paca()
71 */
72static notrace inline void account_cpu_user_entry(void)
73{
74 unsigned long tb = mftb();
75 struct cpu_accounting_data *acct = raw_get_accounting(current);
76
77 acct->utime += (tb - acct->starttime_user);
78 acct->starttime = tb;
79}
80
81static notrace inline void account_cpu_user_exit(void)
82{
83 unsigned long tb = mftb();
84 struct cpu_accounting_data *acct = raw_get_accounting(current);
85
86 acct->stime += (tb - acct->starttime);
87 acct->starttime_user = tb;
88}
89
90static notrace inline void account_stolen_time(void)
91{
92#ifdef CONFIG_PPC_SPLPAR
93 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
94 struct lppaca *lp = local_paca->lppaca_ptr;
95
96 if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
97 accumulate_stolen_time();
98 }
99#endif
100}
101
102#endif /* __KERNEL__ */
103#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
104static inline void account_cpu_user_entry(void)
105{
106}
107static inline void account_cpu_user_exit(void)
108{
109}
110static notrace inline void account_stolen_time(void)
111{
112}
113#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
114#endif /* __POWERPC_CPUTIME_H */