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authorMichael Ellerman <mpe@ellerman.id.au>2014-05-23 18:15:27 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-05-28 13:35:35 +1000
commit5853aef1ac5c5d83076203e840ca463857a7515d (patch)
tree0446a6c5855dd6cf1e7aec37b9ea6f5651c4f579 /arch/powerpc/kernel/setup-common.c
parent8d6f7c5aa3db6f3e5e43d09f8a0166c7d96f33f3 (diff)
downloadop-kernel-dev-5853aef1ac5c5d83076203e840ca463857a7515d.zip
op-kernel-dev-5853aef1ac5c5d83076203e840ca463857a7515d.tar.gz
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/kernel/setup-common.c')
-rw-r--r--arch/powerpc/kernel/setup-common.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 3cf25c8..aa0f5ed 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -390,9 +390,10 @@ void __init check_for_initrd(void)
#ifdef CONFIG_SMP
-int threads_per_core, threads_shift;
+int threads_per_core, threads_per_subcore, threads_shift;
cpumask_t threads_core_mask;
EXPORT_SYMBOL_GPL(threads_per_core);
+EXPORT_SYMBOL_GPL(threads_per_subcore);
EXPORT_SYMBOL_GPL(threads_shift);
EXPORT_SYMBOL_GPL(threads_core_mask);
@@ -401,6 +402,7 @@ static void __init cpu_init_thread_core_maps(int tpc)
int i;
threads_per_core = tpc;
+ threads_per_subcore = tpc;
cpumask_clear(&threads_core_mask);
/* This implementation only supports power of 2 number of threads
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