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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2018-10-11 11:03:01 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-13 22:21:25 +1100 |
| commit | 425752c63b6f3fed7b5a9cba2b8101a92cf36995 (patch) | |
| tree | 9257d91dd485476e4feeeaaa71dba4c54317fde0 /arch/powerpc/include/asm/cputhreads.h | |
| parent | bf6cbd0c87f30d0e4401be91a8161ce11079027a (diff) | |
| download | linux-425752c63b6f3fed7b5a9cba2b8101a92cf36995.tar.bz2 | |
powerpc: Detect the presence of big-cores via "ibm, thread-groups"
On IBM POWER9, the device tree exposes a property array identifed by
"ibm,thread-groups" which will indicate which groups of threads share
a particular set of resources.
As of today we only have one form of grouping identifying the group of
threads in the core that share the L1 cache, translation cache and
instruction data flow.
This patch adds helper functions to parse the contents of
"ibm,thread-groups" and populate a per-cpu variable to cache
information about siblings of each CPU that share the L1, traslation
cache and instruction data-flow.
It also defines a new global variable named "has_big_cores" which
indicates if the cores on this configuration have multiple groups of
threads that share L1 cache.
For each online CPU, it maintains a cpu_smallcore_mask, which
indicates the online siblings which share the L1-cache with it.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/cputhreads.h')
| -rw-r--r-- | arch/powerpc/include/asm/cputhreads.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h index d71a90924f3b..deb99fd6e060 100644 --- a/arch/powerpc/include/asm/cputhreads.h +++ b/arch/powerpc/include/asm/cputhreads.h @@ -23,11 +23,13 @@ extern int threads_per_core; extern int threads_per_subcore; extern int threads_shift; +extern bool has_big_cores; extern cpumask_t threads_core_mask; #else #define threads_per_core 1 #define threads_per_subcore 1 #define threads_shift 0 +#define has_big_cores 0 #define threads_core_mask (*get_cpu_mask(0)) #endif |