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baa36046d0
The archs that implement virtual cputime accounting all flush the cputime of a task when it gets descheduled and sometimes set up some ground initialization for the next task to account its cputime. These archs all put their own hooks in their context switch callbacks and handle the off-case themselves. Consolidate this by creating a new account_switch_vtime() callback called in generic code right after a context switch and that these archs must implement to flush the prev task cputime and initialize the next task cputime related state. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Copyright IBM Corp. 1999, 2009
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __ASM_SWITCH_TO_H
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#define __ASM_SWITCH_TO_H
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#include <linux/thread_info.h>
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extern struct task_struct *__switch_to(void *, void *);
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extern void update_per_regs(struct task_struct *task);
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static inline void save_fp_regs(s390_fp_regs *fpregs)
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{
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asm volatile(
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" std 0,%O0+8(%R0)\n"
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" std 2,%O0+24(%R0)\n"
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" std 4,%O0+40(%R0)\n"
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" std 6,%O0+56(%R0)"
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: "=Q" (*fpregs) : "Q" (*fpregs));
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if (!MACHINE_HAS_IEEE)
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return;
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asm volatile(
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" stfpc %0\n"
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" std 1,%O0+16(%R0)\n"
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" std 3,%O0+32(%R0)\n"
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" std 5,%O0+48(%R0)\n"
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" std 7,%O0+64(%R0)\n"
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" std 8,%O0+72(%R0)\n"
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" std 9,%O0+80(%R0)\n"
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" std 10,%O0+88(%R0)\n"
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" std 11,%O0+96(%R0)\n"
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" std 12,%O0+104(%R0)\n"
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" std 13,%O0+112(%R0)\n"
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" std 14,%O0+120(%R0)\n"
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" std 15,%O0+128(%R0)\n"
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: "=Q" (*fpregs) : "Q" (*fpregs));
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}
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static inline void restore_fp_regs(s390_fp_regs *fpregs)
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{
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asm volatile(
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" ld 0,%O0+8(%R0)\n"
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" ld 2,%O0+24(%R0)\n"
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" ld 4,%O0+40(%R0)\n"
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" ld 6,%O0+56(%R0)"
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: : "Q" (*fpregs));
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if (!MACHINE_HAS_IEEE)
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return;
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asm volatile(
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" lfpc %0\n"
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" ld 1,%O0+16(%R0)\n"
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" ld 3,%O0+32(%R0)\n"
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" ld 5,%O0+48(%R0)\n"
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" ld 7,%O0+64(%R0)\n"
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" ld 8,%O0+72(%R0)\n"
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" ld 9,%O0+80(%R0)\n"
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" ld 10,%O0+88(%R0)\n"
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" ld 11,%O0+96(%R0)\n"
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" ld 12,%O0+104(%R0)\n"
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" ld 13,%O0+112(%R0)\n"
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" ld 14,%O0+120(%R0)\n"
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" ld 15,%O0+128(%R0)\n"
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: : "Q" (*fpregs));
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}
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static inline void save_access_regs(unsigned int *acrs)
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{
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asm volatile("stam 0,15,%0" : "=Q" (*acrs));
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}
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static inline void restore_access_regs(unsigned int *acrs)
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{
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asm volatile("lam 0,15,%0" : : "Q" (*acrs));
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}
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#define switch_to(prev,next,last) do { \
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if (prev->mm) { \
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save_fp_regs(&prev->thread.fp_regs); \
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save_access_regs(&prev->thread.acrs[0]); \
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} \
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if (next->mm) { \
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restore_fp_regs(&next->thread.fp_regs); \
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restore_access_regs(&next->thread.acrs[0]); \
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update_per_regs(next); \
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} \
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prev = __switch_to(prev,next); \
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} while (0)
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extern void account_tick_vtime(struct task_struct *);
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#define finish_arch_switch(prev) do { \
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set_fs(current->thread.mm_segment); \
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} while (0)
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#endif /* __ASM_SWITCH_TO_H */
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