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