[RFC PATCH 8/9] powerpc: Support to replay PMIs
maddy at linux.vnet.ibm.com
Tue Jul 26 16:40:38 AEST 2016
On Tuesday 26 July 2016 11:20 AM, Nicholas Piggin wrote:
> On Mon, 25 Jul 2016 20:22:21 +0530
> Madhavan Srinivasan <maddy at linux.vnet.ibm.com> wrote:
>> Code to replay the Performance Monitoring Interrupts(PMI).
>> In the masked_interrupt handler, for PMIs we reset the MSR[EE]
>> and return. This is due the fact that PMIs are level triggered.
>> In the __check_irq_replay(), we enabled the MSR[EE] which will
>> fire the interrupt for us.
>> Patch also adds a new arch_local_irq_disable_var() variant. New
>> variant takes an input value to write to the paca->soft_enabled.
>> This will be used in following patch to implement the tri-state
>> value for soft-enabled.
> Same comment also applies about patches being standalone
> transformations that work before and after. Some of these
> can be squashed together I think.
>> Signed-off-by: Madhavan Srinivasan <maddy at linux.vnet.ibm.com>
>> arch/powerpc/include/asm/hw_irq.h | 14 ++++++++++++++
>> arch/powerpc/kernel/irq.c | 9 ++++++++-
>> 2 files changed, 22 insertions(+), 1 deletion(-)
>> diff --git a/arch/powerpc/include/asm/hw_irq.h
>> b/arch/powerpc/include/asm/hw_irq.h index cc69dde6eb84..863179654452
>> 100644 --- a/arch/powerpc/include/asm/hw_irq.h
>> +++ b/arch/powerpc/include/asm/hw_irq.h
>> @@ -81,6 +81,20 @@ static inline unsigned long
>> arch_local_irq_disable(void) return flags;
>> +static inline unsigned long arch_local_irq_disable_var(int value)
>> + unsigned long flags, zero;
>> + asm volatile(
>> + "li %1,%3; lbz %0,%2(13); stb %1,%2(13)"
>> + : "=r" (flags), "=&r" (zero)
>> + : "i" (offsetof(struct paca_struct, soft_enabled)),\
>> + "i" (value)
>> + : "memory");
>> + return flags;
> arch_ function suggests it is arch implementation of a generic
> kernel function or something. I think our soft interrupt levels
> are just used in powerpc specific code.
> The name could also be a little more descriptive.
> I would have our internal function be something like
> soft_irq_set_level(), and then the arch disable just sets to
> the appropriate level as it does today.
> The PMU disable level could be implemented in powerpc specific
> header with local_irq_and_pmu_disable() or something like that.
Yes. will do.
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