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powerpc: Add helper functions for transactional memory context switching

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Here we add the helper functions to be used when context switching.  These
allow us to fully reclaim and recheckpoint a transaction.

We introduce a new paca field called tm_scratch to help us store away register
values when doing the low level tm reclaim register save.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling
2013-02-13 16:21:35 +00:00
committed by Benjamin Herrenschmidt
parent afc07701ce
commit 98ae22e15b
4 changed files with 411 additions and 1 deletions
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2
arch/powerpc/include/asm/reg.h
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@@ -797,7 +797,7 @@
* HV mode in which case it is HSPRG0
*
* 64-bit server:
* - SPRG0 unused (reserved for HV on Power4)
* - SPRG0 scratch for TM recheckpoint/reclaim (reserved for HV on Power4)
* - SPRG2 scratch for exception vectors
* - SPRG3 CPU and NUMA node for VDSO getcpu (user visible)
* - HSPRG0 stores PACA in HV mode

20
arch/powerpc/include/asm/tm.h Normal file
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@@ -0,0 +1,20 @@
/*
* Transactional memory support routines to reclaim and recheckpoint
* transactional process state.
*
* Copyright 2012 Matt Evans & Michael Neuling, IBM Corporation.
*/
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
extern void do_load_up_transact_fpu(struct thread_struct *thread);
extern void do_load_up_transact_altivec(struct thread_struct *thread);
#endif
extern void tm_enable(void);
extern void tm_reclaim(struct thread_struct *thread,
unsigned long orig_msr, uint8_t cause);
extern void tm_recheckpoint(struct thread_struct *thread,
unsigned long orig_msr);
extern void tm_abort(uint8_t cause);
extern void tm_save_sprs(struct thread_struct *thread);
extern void tm_restore_sprs(struct thread_struct *thread);