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powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG

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New Kconfig is added "CONFIG_PPC_IRQ_SOFT_MASK_DEBUG" to add WARN_ON
to alert the invalid transitions. Also moved the code under the
CONFIG_TRACE_IRQFLAGS in arch_local_irq_restore() to new Kconfig.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
[mpe: Fix name of CONFIG option in change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-12-20 09:25:54 +05:30 committed by Michael Ellerman
parent f442d00480
commit 9aa88188ee
4 changed files with 10 additions and 6 deletions
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4
arch/powerpc/Kconfig.debug
View file

@ -90,6 +90,10 @@ config MSI_BITMAP_SELFTEST
depends on DEBUG_KERNEL
default n
config PPC_IRQ_SOFT_MASK_DEBUG
bool "Include extra checks for powerpc irq soft masking"
default n
config XMON
bool "Include xmon kernel debugger"
depends on DEBUG_KERNEL

4
arch/powerpc/include/asm/hw_irq.h
View file

@ -71,7 +71,7 @@ static inline notrace unsigned long irq_soft_mask_return(void)
*/
static inline notrace void irq_soft_mask_set(unsigned long mask)
{
#ifdef CONFIG_TRACE_IRQFLAGS
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
/*
* The irq mask must always include the STD bit if any are set.
*
@ -101,7 +101,7 @@ static inline notrace unsigned long irq_soft_mask_set_return(unsigned long mask)
{
unsigned long flags;
#ifdef CONFIG_TRACE_IRQFLAGS
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
WARN_ON(mask && !(mask & IRQS_DISABLED));
#endif

4
arch/powerpc/kernel/entry_64.S
View file

@ -128,7 +128,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
* of irq tracing is used, we additionally check that condition
* is correct
*/
#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG)
#if defined(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG) && defined(CONFIG_BUG)
lbz r10,PACAIRQSOFTMASK(r13)
1: tdnei r10,IRQS_ENABLED
EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING
@ -911,7 +911,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
rlwinm r7,r7,0,~PACA_IRQ_HARD_DIS
stb r7,PACAIRQHAPPENED(r13)
1:
#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG)
#if defined(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG) && defined(CONFIG_BUG)
/* The interrupt should not have soft enabled. */
lbz r7,PACAIRQSOFTMASK(r13)
1: tdeqi r7,IRQS_ENABLED

4
arch/powerpc/kernel/irq.c
View file

@ -264,7 +264,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
*/
if (unlikely(irq_happened != PACA_IRQ_HARD_DIS))
__hard_irq_disable();
#ifdef CONFIG_TRACE_IRQFLAGS
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
else {
/*
* We should already be hard disabled here. We had bugs
@ -275,7 +275,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
if (WARN_ON(mfmsr() & MSR_EE))
__hard_irq_disable();
}
#endif /* CONFIG_TRACE_IRQFLAGS */
#endif
irq_soft_mask_set(IRQS_ALL_DISABLED);
trace_hardirqs_off();