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[POWERPC] Cleanup SMT thread handling

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This cleans up the SMT thread handling, removing some hard coded
assumptions and providing a set of helpers to convert between linux
cpu numbers, thread numbers and cores.

This implementation requires the number of threads per core to be a
power of 2 and identical on all cores in the system, but it's an
implementation detail, not an API requirement and so this limitation
can be lifted in the future if anybody ever needs it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2007-10-25 15:27:44 +10:00
committed by Paul Mackerras
parent b80fa3cce7
commit 8d089085a4
4 changed files with 140 additions and 15 deletions
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3
arch/powerpc/platforms/cell/smp.c
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@ -42,6 +42,7 @@
#include <asm/firmware.h>
#include <asm/system.h>
#include <asm/rtas.h>
#include <asm/cputhreads.h>
#include "interrupt.h"
#include <asm/udbg.h>
@ -182,7 +183,7 @@ static int smp_cell_cpu_bootable(unsigned int nr)
*/
if (system_state < SYSTEM_RUNNING &&
cpu_has_feature(CPU_FTR_SMT) &&
!smt_enabled_at_boot && nr % 2 != 0)
!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0)
return 0;
return 1;