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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-01 02:45:27 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-09 00:55:02 +0100 |
| commit | fe1952fc0afb9a2e4c79f103c08aef5d13db1873 (patch) | |
| tree | ea1fc050910844e3c72d8fa576e7bf429c09d788 /arch/powerpc/include/asm/system.h | |
| parent | powerpc: Use the same interrupt prolog for perfmon as other interrupts (diff) | |
| download | linux-fe1952fc0afb9a2e4c79f103c08aef5d13db1873.tar.xz linux-fe1952fc0afb9a2e4c79f103c08aef5d13db1873.zip | |
powerpc: Rework runlatch code
This moves the inlines into system.h and changes the runlatch
code to use the thread local flags (non-atomic) rather than
the TIF flags (atomic) to keep track of the latch state.
The code to turn it back on in an asynchronous interrupt is
now simplified and partially inlined.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/system.h')
| -rw-r--r-- | arch/powerpc/include/asm/system.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/system.h b/arch/powerpc/include/asm/system.h index c377457d1b89..a02883d5af43 100644 --- a/arch/powerpc/include/asm/system.h +++ b/arch/powerpc/include/asm/system.h @@ -550,5 +550,43 @@ extern void reloc_got2(unsigned long); extern struct dentry *powerpc_debugfs_root; +#ifdef CONFIG_PPC64 + +extern void __ppc64_runlatch_on(void); +extern void __ppc64_runlatch_off(void); + +/* + * We manually hard enable-disable, this is called + * in the idle loop and we don't want to mess up + * with soft-disable/enable & interrupt replay. + */ +#define ppc64_runlatch_off() \ + do { \ + if (cpu_has_feature(CPU_FTR_CTRL) && \ + test_thread_local_flags(_TLF_RUNLATCH)) { \ + unsigned long msr = mfmsr(); \ + __hard_irq_disable(); \ + __ppc64_runlatch_off(); \ + if (msr & MSR_EE) \ + __hard_irq_enable(); \ + } \ + } while (0) + +#define ppc64_runlatch_on() \ + do { \ + if (cpu_has_feature(CPU_FTR_CTRL) && \ + !test_thread_local_flags(_TLF_RUNLATCH)) { \ + unsigned long msr = mfmsr(); \ + __hard_irq_disable(); \ + __ppc64_runlatch_on(); \ + if (msr & MSR_EE) \ + __hard_irq_enable(); \ + } \ + } while (0) +#else +#define ppc64_runlatch_on() +#define ppc64_runlatch_off() +#endif /* CONFIG_PPC64 */ + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SYSTEM_H */ |