diff options
| author | Paul Mackerras <paulus@samba.org> | 2009-06-17 21:50:04 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-18 11:11:44 +0200 |
| commit | 105988c015943e77092a6568bc5fb7e386df6ccd (patch) | |
| tree | bd352fe5e68a66de2e08a8b91c8f8cccf422f346 /arch/powerpc/include/asm | |
| parent | a73c7d84a1975b44c0ebd03c2dec288af1426349 (diff) | |
perf_counter: powerpc: Enable use of software counters on 32-bit powerpc
This enables the perf_counter subsystem on 32-bit powerpc. Since we
don't have any support for hardware counters on 32-bit powerpc yet,
only software counters can be used.
Besides selecting HAVE_PERF_COUNTERS for 32-bit powerpc as well as
64-bit, the main thing this does is add an implementation of
set_perf_counter_pending(). This needs to arrange for
perf_counter_do_pending() to be called when interrupts are enabled.
Rather than add code to local_irq_restore as 64-bit does, the 32-bit
set_perf_counter_pending() generates an interrupt by setting the
decrementer to 1 so that a decrementer interrupt will become pending
in 1 or 2 timebase ticks (if a decrementer interrupt isn't already
pending). When interrupts are enabled, timer_interrupt() will be
called, and some new code in there calls perf_counter_do_pending().
We use a per-cpu array of flags to indicate whether we need to call
perf_counter_do_pending() or not.
This introduces a couple of new Kconfig symbols: PPC_HAVE_PMU_SUPPORT,
which is selected by processor families for which we have hardware PMU
support (currently only PPC64), and PPC_PERF_CTRS, which enables the
powerpc-specific perf_counter back-end.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linuxppc-dev@ozlabs.org
Cc: benh@kernel.crashing.org
LKML-Reference: <19000.55404.103840.393470@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/hw_irq.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/perf_counter.h | 10 |
2 files changed, 12 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index 10a642df014..867ab8ed69b 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -131,6 +131,8 @@ static inline int irqs_disabled_flags(unsigned long flags) struct irq_chip; #ifdef CONFIG_PERF_COUNTERS + +#ifdef CONFIG_PPC64 static inline unsigned long test_perf_counter_pending(void) { unsigned long x; @@ -154,8 +156,9 @@ static inline void clear_perf_counter_pending(void) "r" (0), "i" (offsetof(struct paca_struct, perf_counter_pending))); } +#endif /* CONFIG_PPC64 */ -#else +#else /* CONFIG_PERF_COUNTERS */ static inline unsigned long test_perf_counter_pending(void) { diff --git a/arch/powerpc/include/asm/perf_counter.h b/arch/powerpc/include/asm/perf_counter.h index b398a84edce..2c2d9f643df 100644 --- a/arch/powerpc/include/asm/perf_counter.h +++ b/arch/powerpc/include/asm/perf_counter.h @@ -57,11 +57,17 @@ extern struct power_pmu *ppmu; struct pt_regs; extern unsigned long perf_misc_flags(struct pt_regs *regs); -#define perf_misc_flags(regs) perf_misc_flags(regs) - extern unsigned long perf_instruction_pointer(struct pt_regs *regs); /* + * Only override the default definitions in include/linux/perf_counter.h + * if we have hardware PMU support. + */ +#ifdef CONFIG_PPC_PERF_CTRS +#define perf_misc_flags(regs) perf_misc_flags(regs) +#endif + +/* * The power_pmu.get_constraint function returns a 64-bit value and * a 64-bit mask that express the constraints between this event and * other events. |