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powerpc: Add support for setting SPRN_TIDR

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We need the SPRN_TIDR to be set for use with fast thread-wakeup (core-
to-core wakeup) and also with CAPI.

Each thread in a process needs to have a unique id within the process.
But for now, we assign globally unique thread ids to all threads in
the system.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
[mpe: Simplify tidr clearing on fork() and ctx switch code]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu
2017-11-07 18:23:53 -08:00
committed by Michael Ellerman
parent ece4e51291
commit ec233ede4c
3 changed files with 120 additions and 0 deletions
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3
arch/powerpc/include/asm/switch_to.h
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@@ -91,4 +91,7 @@ static inline void clear_task_ebb(struct task_struct *t)
#endif
}
extern int set_thread_tidr(struct task_struct *t);
extern void clear_thread_tidr(struct task_struct *t);
#endif /* _ASM_POWERPC_SWITCH_TO_H */