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author | Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> | 2010-10-06 08:36:59 (GMT) |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-11-29 04:48:19 (GMT) |
commit | 99d86705253dcf728dbbec4d694a6764b6edb70c (patch) | |
tree | e4c68adab6448463a77141c1797671417f58242c /arch/powerpc/include | |
parent | 787d44caa5bca249d8781d21b626c417f1e3cfc4 (diff) | |
download | linux-fsl-qoriq-99d86705253dcf728dbbec4d694a6764b6edb70c.tar.xz |
powerpc: Cleanup APIs for cpu/thread/core mappings
These APIs take logical cpu number as input
Change cpu_first_thread_in_core() to cpu_first_thread_sibling()
Change cpu_last_thread_in_core() to cpu_last_thread_sibling()
These APIs convert core number (index) to logical cpu/thread numbers
Add cpu_first_thread_of_core(int core)
Changed cpu_thread_to_core() to cpu_core_index_of_thread(int cpu)
The goal is to make 'threads_per_core' accessible to the
pseries_energy module. Instead of making an API to read
threads_per_core, this is a higher level wrapper function to
convert from logical cpu number to core number.
The current APIs cpu_first_thread_in_core() and
cpu_last_thread_in_core() returns logical CPU number while
cpu_thread_to_core() returns core number or index which is
not a logical CPU number. The new APIs are now clearly named to
distinguish 'core number' versus first and last 'logical cpu
number' in that core.
The new APIs cpu_{first,last}_thread_sibling() work on
logical cpu numbers. While cpu_first_thread_of_core() and
cpu_core_index_of_thread() work on core index.
Example usage: (4 threads per core system)
cpu_first_thread_sibling(5) = 4
cpu_last_thread_sibling(5) = 7
cpu_core_index_of_thread(5) = 1
cpu_first_thread_of_core(1) = 4
cpu_core_index_of_thread() is used in cpu_to_drc_index() in the
module and cpu_first_thread_of_core() is used in
drc_index_to_cpu() in the module.
Make API changes to few callers. Export symbols for use in modules.
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r-- | arch/powerpc/include/asm/cputhreads.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h index a8e1844..f71bb4c 100644 --- a/arch/powerpc/include/asm/cputhreads.h +++ b/arch/powerpc/include/asm/cputhreads.h @@ -61,22 +61,25 @@ static inline cpumask_t cpu_online_cores_map(void) return cpu_thread_mask_to_cores(cpu_online_map); } -static inline int cpu_thread_to_core(int cpu) -{ - return cpu >> threads_shift; -} +#ifdef CONFIG_SMP +int cpu_core_index_of_thread(int cpu); +int cpu_first_thread_of_core(int core); +#else +static inline int cpu_core_index_of_thread(int cpu) { return cpu; } +static inline int cpu_first_thread_of_core(int core) { return core; } +#endif static inline int cpu_thread_in_core(int cpu) { return cpu & (threads_per_core - 1); } -static inline int cpu_first_thread_in_core(int cpu) +static inline int cpu_first_thread_sibling(int cpu) { return cpu & ~(threads_per_core - 1); } -static inline int cpu_last_thread_in_core(int cpu) +static inline int cpu_last_thread_sibling(int cpu) { return cpu | (threads_per_core - 1); } |