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
23 typedef u64 __nocast cputime_t;
24 typedef 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 */
32 extern u64 __cputime_usec_factor;
33
cputime_to_usecs(const cputime_t ct)34 static 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)
arch_vtime_task_switch(struct task_struct * tsk)49 static 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 */
arch_vtime_task_switch(struct task_struct * prev)59 static 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 */
account_cpu_user_entry(void)72 static 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
account_cpu_user_exit(void)81 static 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
account_stolen_time(void)90 static 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 */
account_cpu_user_entry(void)104 static inline void account_cpu_user_entry(void)
105 {
106 }
account_cpu_user_exit(void)107 static inline void account_cpu_user_exit(void)
108 {
109 }
account_stolen_time(void)110 static notrace inline void account_stolen_time(void)
111 {
112 }
113 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
114 #endif /* __POWERPC_CPUTIME_H */
115