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)
arch_vtime_task_switch(struct task_struct * tsk)35 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
36 
37 #else
38 #define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
39 #define raw_get_accounting(tsk)	get_accounting(tsk)
40 /*
41  * Called from the context switch with interrupts disabled, to charge all
42  * accumulated times to the current process, and to prepare accounting on
43  * the next process.
44  */
arch_vtime_task_switch(struct task_struct * prev)45 static inline void arch_vtime_task_switch(struct task_struct *prev)
46 {
47 	struct cpu_accounting_data *acct = get_accounting(current);
48 	struct cpu_accounting_data *acct0 = get_accounting(prev);
49 
50 	acct->starttime = acct0->starttime;
51 }
52 #endif
53 
54 /*
55  * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
56  * can't use get_paca()
57  */
account_cpu_user_entry(void)58 static notrace inline void account_cpu_user_entry(void)
59 {
60 	unsigned long tb = mftb();
61 	struct cpu_accounting_data *acct = raw_get_accounting(current);
62 
63 	acct->utime += (tb - acct->starttime_user);
64 	acct->starttime = tb;
65 }
66 
account_cpu_user_exit(void)67 static notrace inline void account_cpu_user_exit(void)
68 {
69 	unsigned long tb = mftb();
70 	struct cpu_accounting_data *acct = raw_get_accounting(current);
71 
72 	acct->stime += (tb - acct->starttime);
73 	acct->starttime_user = tb;
74 }
75 
account_stolen_time(void)76 static notrace inline void account_stolen_time(void)
77 {
78 #ifdef CONFIG_PPC_SPLPAR
79 	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
80 		struct lppaca *lp = local_paca->lppaca_ptr;
81 
82 		if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
83 			pseries_accumulate_stolen_time();
84 	}
85 #endif
86 }
87 
88 #endif /* __KERNEL__ */
89 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
account_cpu_user_entry(void)90 static inline void account_cpu_user_entry(void)
91 {
92 }
account_cpu_user_exit(void)93 static inline void account_cpu_user_exit(void)
94 {
95 }
account_stolen_time(void)96 static notrace inline void account_stolen_time(void)
97 {
98 }
99 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
100 #endif /* __POWERPC_CPUTIME_H */
101