diff options
| author |   Michael Ellerman <mpe@ellerman.id.au> | 2014-05-23 18:15:27 +1000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-28 13:35:35 +1000 |
| commit | 5853aef1ac5c5d83076203e840ca463857a7515d (patch) | |
| tree | 0446a6c5855dd6cf1e7aec37b9ea6f5651c4f579 /arch/powerpc/include/asm/cputhreads.h | |
| parent | powerpc/powernv: Make it possible to skip the IRQHAPPENED check in power7_nap() (diff) | |
| download | linux-dev-5853aef1ac5c5d83076203e840ca463857a7515d.tar.xz linux-dev-5853aef1ac5c5d83076203e840ca463857a7515d.zip | |
powerpc: Add threads_per_subcore
On POWER8 we have a new concept of a subcore. This is what happens when
you take a regular core and split it. A subcore is a grouping of two or
four SMT threads, as well as a handfull of SPRs which allows the subcore
to appear as if it were a core from the point of view of a guest.
Unlike threads_per_core which is fixed at boot, threads_per_subcore can
change while the system is running. Most code will not want to use
threads_per_subcore.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/cputhreads.h')
| -rw-r--r-- | arch/powerpc/include/asm/cputhreads.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h index ac3eedb9b74a..2bf8e9307be9 100644 --- a/arch/powerpc/include/asm/cputhreads.h +++ b/arch/powerpc/include/asm/cputhreads.h @@ -18,10 +18,12 @@ #ifdef CONFIG_SMP extern int threads_per_core; +extern int threads_per_subcore; extern int threads_shift; extern cpumask_t threads_core_mask; #else #define threads_per_core 1 +#define threads_per_subcore 1 #define threads_shift 0 #define threads_core_mask (CPU_MASK_CPU0) #endif @@ -74,6 +76,11 @@ static inline int cpu_thread_in_core(int cpu) return cpu & (threads_per_core - 1); } +static inline int cpu_thread_in_subcore(int cpu) +{ + return cpu & (threads_per_subcore - 1); +} + static inline int cpu_first_thread_sibling(int cpu) { return cpu & ~(threads_per_core - 1); |