diff options
| -rw-r--r-- | arch/s390/Kconfig.debug | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/entry.S | 29 | ||||
| -rw-r--r-- | arch/s390/kernel/entry64.S | 21 | ||||
| -rw-r--r-- | arch/s390/kernel/irq.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/process.c | 1 | ||||
| -rw-r--r-- | drivers/s390/char/sclp.c | 10 | ||||
| -rw-r--r-- | drivers/s390/cio/cio.c | 2 | ||||
| -rw-r--r-- | include/asm-s390/irqflags.h | 50 | ||||
| -rw-r--r-- | include/asm-s390/system.h | 32 |
9 files changed, 113 insertions, 38 deletions
diff --git a/arch/s390/Kconfig.debug b/arch/s390/Kconfig.debug index f53b6d5300e5..2283933a9a93 100644 --- a/arch/s390/Kconfig.debug +++ b/arch/s390/Kconfig.debug @@ -1,5 +1,9 @@ menu "Kernel hacking" +config TRACE_IRQFLAGS_SUPPORT + bool + default y + source "lib/Kconfig.debug" endmenu diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index d8948c342caf..5b5799ac8f83 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -58,6 +58,21 @@ STACK_SIZE = 1 << STACK_SHIFT #define BASED(name) name-system_call(%r13) +#ifdef CONFIG_TRACE_IRQFLAGS + .macro TRACE_IRQS_ON + l %r1,BASED(.Ltrace_irq_on) + basr %r14,%r1 + .endm + + .macro TRACE_IRQS_OFF + l %r1,BASED(.Ltrace_irq_off) + basr %r14,%r1 + .endm +#else +#define TRACE_IRQS_ON +#define TRACE_IRQS_OFF +#endif + /* * Register usage in interrupt handlers: * R9 - pointer to current task structure @@ -361,6 +376,7 @@ ret_from_fork: st %r15,SP_R15(%r15) # store stack pointer for new kthread 0: l %r1,BASED(.Lschedtail) basr %r14,%r1 + TRACE_IRQS_ON stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_return) @@ -516,6 +532,7 @@ pgm_no_vtime3: mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP + TRACE_IRQS_ON stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_do_svc) @@ -539,9 +556,11 @@ io_int_handler: io_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct + TRACE_IRQS_OFF l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ la %r2,SP_PTREGS(%r15) # address of register-save area basr %r14,%r1 # branch to standard irq handler + TRACE_IRQS_ON io_return: tm SP_PSW+1(%r15),0x01 # returning to user ? @@ -651,10 +670,12 @@ ext_int_handler: ext_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct + TRACE_IRQS_OFF la %r2,SP_PTREGS(%r15) # address of register-save area lh %r3,__LC_EXT_INT_CODE # get interruption code l %r1,BASED(.Ldo_extint) basr %r14,%r1 + TRACE_IRQS_ON b BASED(io_return) __critical_end: @@ -731,8 +752,10 @@ mcck_no_vtime: stosm __SF_EMPTY(%r15),0x04 # turn dat on tm __TI_flags+3(%r9),_TIF_MCCK_PENDING bno BASED(mcck_return) + TRACE_IRQS_OFF l %r1,BASED(.Ls390_handle_mcck) basr %r14,%r1 # call machine check handler + TRACE_IRQS_ON mcck_return: mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit @@ -1012,7 +1035,11 @@ cleanup_io_leave_insn: .Lvfork: .long sys_vfork .Lschedtail: .long schedule_tail .Lsysc_table: .long sys_call_table - +#ifdef CONFIG_TRACE_IRQFLAGS +.Ltrace_irq_on:.long trace_hardirqs_on +.Ltrace_irq_off: + .long trace_hardirqs_off +#endif .Lcritical_start: .long __critical_start + 0x80000000 .Lcritical_end: diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 1ca499fa54b4..56f5f613b868 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -58,6 +58,19 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \ #define BASED(name) name-system_call(%r13) +#ifdef CONFIG_TRACE_IRQFLAGS + .macro TRACE_IRQS_ON + brasl %r14,trace_hardirqs_on + .endm + + .macro TRACE_IRQS_OFF + brasl %r14,trace_hardirqs_off + .endm +#else +#define TRACE_IRQS_ON +#define TRACE_IRQS_OFF +#endif + .macro STORE_TIMER lc_offset #ifdef CONFIG_VIRT_CPU_ACCOUNTING stpt \lc_offset @@ -354,6 +367,7 @@ ret_from_fork: jo 0f stg %r15,SP_R15(%r15) # store stack pointer for new kthread 0: brasl %r14,schedule_tail + TRACE_IRQS_ON stosm 24(%r15),0x03 # reenable interrupts j sysc_return @@ -535,6 +549,7 @@ pgm_no_vtime3: mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP + TRACE_IRQS_ON stosm __SF_EMPTY(%r15),0x03 # reenable interrupts j sysc_do_svc @@ -557,8 +572,10 @@ io_int_handler: io_no_vtime: #endif lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + TRACE_IRQS_OFF la %r2,SP_PTREGS(%r15) # address of register-save area brasl %r14,do_IRQ # call standard irq handler + TRACE_IRQS_ON io_return: tm SP_PSW+1(%r15),0x01 # returning to user ? @@ -665,9 +682,11 @@ ext_int_handler: ext_no_vtime: #endif lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + TRACE_IRQS_OFF la %r2,SP_PTREGS(%r15) # address of register-save area llgh %r3,__LC_EXT_INT_CODE # get interruption code brasl %r14,do_extint + TRACE_IRQS_ON j io_return __critical_end: @@ -743,7 +762,9 @@ mcck_no_vtime: stosm __SF_EMPTY(%r15),0x04 # turn dat on tm __TI_flags+7(%r9),_TIF_MCCK_PENDING jno mcck_return + TRACE_IRQS_OFF brasl %r14,s390_handle_mcck + TRACE_IRQS_ON mcck_return: mvc __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 480b6a5fef3a..e347190d9aea 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -97,7 +97,7 @@ asmlinkage void do_softirq(void) account_system_vtime(current); - __local_bh_enable(); + _local_bh_enable(); local_irq_restore(flags); } diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 1f9399191794..78c8e5548caf 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -142,6 +142,7 @@ static void default_idle(void) return; } + trace_hardirqs_on(); /* Wait for external, I/O or machine check interrupt. */ __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_IO | PSW_MASK_EXT); diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index 4138564402b8..985d1613baaa 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -383,6 +383,7 @@ void sclp_sync_wait(void) { unsigned long psw_mask; + unsigned long flags; unsigned long cr0, cr0_sync; u64 timeout; @@ -395,9 +396,11 @@ sclp_sync_wait(void) sclp_tod_from_jiffies(sclp_request_timer.expires - jiffies); } + local_irq_save(flags); /* Prevent bottom half from executing once we force interrupts open */ local_bh_disable(); /* Enable service-signal interruption, disable timer interrupts */ + trace_hardirqs_on(); __ctl_store(cr0, 0, 0); cr0_sync = cr0; cr0_sync |= 0x00000200; @@ -415,11 +418,10 @@ sclp_sync_wait(void) barrier(); cpu_relax(); } - /* Restore interrupt settings */ - asm volatile ("SSM 0(%0)" - : : "a" (&psw_mask) : "memory"); + local_irq_disable(); __ctl_load(cr0, 0, 0); - __local_bh_enable(); + _local_bh_enable(); + local_irq_restore(flags); } EXPORT_SYMBOL(sclp_sync_wait); diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index a3423267467f..6fec90eab00e 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -147,7 +147,7 @@ cio_tpi(void) sch->driver->irq(&sch->dev); spin_unlock(&sch->lock); irq_exit (); - __local_bh_enable(); + _local_bh_enable(); return 1; } diff --git a/include/asm-s390/irqflags.h b/include/asm-s390/irqflags.h new file mode 100644 index 000000000000..65f4db627e7a --- /dev/null +++ b/include/asm-s390/irqflags.h @@ -0,0 +1,50 @@ +/* + * include/asm-s390/irqflags.h + * + * Copyright (C) IBM Corp. 2006 + * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> + */ + +#ifndef __ASM_IRQFLAGS_H +#define __ASM_IRQFLAGS_H + +#ifdef __KERNEL__ + +/* interrupt control.. */ +#define raw_local_irq_enable() ({ \ + unsigned long __dummy; \ + __asm__ __volatile__ ( \ + "stosm 0(%1),0x03" \ + : "=m" (__dummy) : "a" (&__dummy) : "memory" ); \ + }) + +#define raw_local_irq_disable() ({ \ + unsigned long __flags; \ + __asm__ __volatile__ ( \ + "stnsm 0(%1),0xfc" : "=m" (__flags) : "a" (&__flags) ); \ + __flags; \ + }) + +#define raw_local_save_flags(x) \ + __asm__ __volatile__("stosm 0(%1),0" : "=m" (x) : "a" (&x), "m" (x) ) + +#define raw_local_irq_restore(x) \ + __asm__ __volatile__("ssm 0(%0)" : : "a" (&x), "m" (x) : "memory") + +#define raw_irqs_disabled() \ +({ \ + unsigned long flags; \ + local_save_flags(flags); \ + !((flags >> __FLAG_SHIFT) & 3); \ +}) + +static inline int raw_irqs_disabled_flags(unsigned long flags) +{ + return !((flags >> __FLAG_SHIFT) & 3); +} + +/* For spinlocks etc */ +#define raw_local_irq_save(x) ((x) = raw_local_irq_disable()) + +#endif /* __KERNEL__ */ +#endif /* __ASM_IRQFLAGS_H */ diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h index 71a0732cd518..9ab186ffde23 100644 --- a/include/asm-s390/system.h +++ b/include/asm-s390/system.h @@ -301,34 +301,6 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) #define set_mb(var, value) do { var = value; mb(); } while (0) #define set_wmb(var, value) do { var = value; wmb(); } while (0) -/* interrupt control.. */ -#define local_irq_enable() ({ \ - unsigned long __dummy; \ - __asm__ __volatile__ ( \ - "stosm 0(%1),0x03" \ - : "=m" (__dummy) : "a" (&__dummy) : "memory" ); \ - }) - -#define local_irq_disable() ({ \ - unsigned long __flags; \ - __asm__ __volatile__ ( \ - "stnsm 0(%1),0xfc" : "=m" (__flags) : "a" (&__flags) ); \ - __flags; \ - }) - -#define local_save_flags(x) \ - __asm__ __volatile__("stosm 0(%1),0" : "=m" (x) : "a" (&x), "m" (x) ) - -#define local_irq_restore(x) \ - __asm__ __volatile__("ssm 0(%0)" : : "a" (&x), "m" (x) : "memory") - -#define irqs_disabled() \ -({ \ - unsigned long flags; \ - local_save_flags(flags); \ - !((flags >> __FLAG_SHIFT) & 3); \ -}) - #ifdef __s390x__ #define __ctl_load(array, low, high) ({ \ @@ -442,8 +414,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) }) #endif /* __s390x__ */ -/* For spinlocks etc */ -#define local_irq_save(x) ((x) = local_irq_disable()) +#include <linux/irqflags.h> /* * Use to set psw mask except for the first byte which @@ -482,4 +453,3 @@ extern void (*_machine_power_off)(void); #endif /* __KERNEL__ */ #endif - |
