| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Definitions for measuring cputime on powerpc machines. |
| 3 | * |
| 4 | * Copyright (C) 2006 Paul Mackerras, IBM Corp. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in |
| 12 | * the same units as the timebase. Otherwise we measure cpu time |
| 13 | * in jiffies using the generic definitions. |
| 14 | */ |
| 15 | |
| 16 | #ifndef __POWERPC_CPUTIME_H |
| 17 | #define __POWERPC_CPUTIME_H |
| 18 | |
| 19 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE |
| 20 | |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/time.h> |
| 23 | #include <asm/div64.h> |
| 24 | #include <asm/time.h> |
| 25 | #include <asm/param.h> |
| 26 | |
| 27 | typedef u64 __nocast cputime_t; |
| 28 | typedef u64 __nocast cputime64_t; |
| 29 | |
| 30 | #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) |
| 31 | |
| 32 | #ifdef __KERNEL__ |
| 33 | /* |
| 34 | * Convert cputime <-> microseconds |
| 35 | */ |
| 36 | extern u64 __cputime_usec_factor; |
| 37 | |
| 38 | static inline unsigned long cputime_to_usecs(const cputime_t ct) |
| 39 | { |
| 40 | return mulhdu((__force u64) ct, __cputime_usec_factor); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * PPC64 uses PACA which is task independent for storing accounting data while |
| 45 | * PPC32 uses struct thread_info, therefore at task switch the accounting data |
| 46 | * has to be populated in the new task |
| 47 | */ |
| 48 | #ifdef CONFIG_PPC64 |
| 49 | #define get_accounting(tsk) (&get_paca()->accounting) |
| 50 | static inline void arch_vtime_task_switch(struct task_struct *tsk) { } |
| 51 | #else |
| 52 | #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) |
| 53 | /* |
| 54 | * Called from the context switch with interrupts disabled, to charge all |
| 55 | * accumulated times to the current process, and to prepare accounting on |
| 56 | * the next process. |
| 57 | */ |
| 58 | static inline void arch_vtime_task_switch(struct task_struct *prev) |
| 59 | { |
| 60 | struct cpu_accounting_data *acct = get_accounting(current); |
| 61 | struct cpu_accounting_data *acct0 = get_accounting(prev); |
| 62 | |
| 63 | acct->starttime = acct0->starttime; |
| 64 | acct->startspurr = acct0->startspurr; |
| 65 | } |
| 66 | #endif |
| 67 | |
| 68 | #endif /* __KERNEL__ */ |
| 69 | #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ |
| 70 | #endif /* __POWERPC_CPUTIME_H */ |