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| author | Sumit Singh <sumsingh@nvidia.com> | 2014-03-14 14:20:18 +0530 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-10 12:07:08 +0200 |
| commit | c9e9fabea850ae38ba17d7ae8765858abb3f4307 (patch) | |
| tree | 6ad5f7ac2d765218d55a2b9794c00428bd42420c | |
| parent | b2f9f35fbc1fd14f8cf2f9a816497697860b4306 (diff) | |
ARM64: defining macros to optimize power usage
Here we have defined some macros such as
cpu_relaxed_read, cpu_relaxed_read_long,
cpu_read_relax in arch/arm64/include/asm/processor.h
which will be used to enhance power optimization on Denver.
bug 1440421
Here we are trying to improve power optimazation
using some macros such
Change-Id: I313e47b35e9a638fe81b7350887f59eeacc45bc1
Signed-off-by: Sumit Singh <sumsingh@nvidia.com>
Reviewed-on: http://git-master/r/381950
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sri Krishna Chowdary <schowdary@nvidia.com>
Reviewed-by: Alexander Van Brunt <avanbrunt@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
| -rw-r--r-- | arch/arm64/include/asm/processor.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 3b7bb031f..89c84b118 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -3,6 +3,7 @@ * * Copyright (C) 1995-1999 Russell King * Copyright (C) 2012 ARM Ltd. + * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -33,6 +34,7 @@ #include <asm/hw_breakpoint.h> #include <asm/ptrace.h> #include <asm/types.h> +#include <asm/atomic.h> #ifdef __KERNEL__ #define STACK_TOP_MAX TASK_SIZE_64 @@ -124,6 +126,10 @@ unsigned long get_wchan(struct task_struct *p); #define cpu_relax() barrier() +#define cpu_relaxed_read(p) ldax32(p) +#define cpu_relaxed_read_long(p) ldax64((u64 *)p) +#define cpu_read_relax() wfe() + /* Thread switching */ extern struct task_struct *cpu_switch_to(struct task_struct *prev, struct task_struct *next); @@ -159,4 +165,6 @@ static inline void spin_lock_prefetch(const void *x) #endif +#include <asm-generic/processor.h> + #endif /* __ASM_PROCESSOR_H */ |