arch/powerpc/include/asm/cputime.h

   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
  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)
  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  */
  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  */
  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
  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
  90
  91 #endif /* __KERNEL__ */
  92 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  93 static inline void account_cpu_user_entry(void)
  94 {
  95 }
  96 static inline void account_cpu_user_exit(void)
  97 {
  98 }
  99 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 100 #endif /* __POWERPC_CPUTIME_H */