From: Heiko Carstens <[email protected]>
irqtrace support for s390.
Signed-off-by: Heiko Carstens <[email protected]>
---
arch/s390/Kconfig.debug | 4 +++
arch/s390/kernel/entry.S | 26 ++++++++++++++++++++++
arch/s390/kernel/entry64.S | 19 ++++++++++++++++
arch/s390/kernel/process.c | 1
drivers/s390/char/sclp.c | 8 ++++---
include/asm-s390/irqflags.h | 50 ++++++++++++++++++++++++++++++++++++++++++++
include/asm-s390/system.h | 32 ----------------------------
7 files changed, 106 insertions(+), 34 deletions(-)
diff -purN a/arch/s390/Kconfig.debug b/arch/s390/Kconfig.debug
--- a/arch/s390/Kconfig.debug 2006-06-06 02:57:02.000000000 +0200
+++ b/arch/s390/Kconfig.debug 2006-06-14 15:12:26.000000000 +0200
@@ -1,5 +1,9 @@
menu "Kernel hacking"
+config TRACE_IRQFLAGS_SUPPORT
+ bool
+ default y
+
source "lib/Kconfig.debug"
endmenu
diff -purN a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
--- a/arch/s390/kernel/entry.S 2006-06-14 15:11:20.000000000 +0200
+++ b/arch/s390/kernel/entry.S 2006-06-14 15:26:32.000000000 +0200
@@ -59,6 +59,21 @@ 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
@@ -360,6 +375,7 @@ 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)
@@ -515,6 +531,7 @@ 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)
@@ -538,9 +555,11 @@ 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 ?
@@ -650,10 +669,12 @@ 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:
@@ -1010,6 +1031,11 @@ cleanup_io_leave_insn:
.Ltrace: .long syscall_trace
.Lvfork: .long sys_vfork
.Lschedtail: .long schedule_tail
+#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
diff -purN a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
--- a/arch/s390/kernel/entry64.S 2006-06-14 15:11:20.000000000 +0200
+++ b/arch/s390/kernel/entry64.S 2006-06-14 15:21:29.000000000 +0200
@@ -59,6 +59,19 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_
#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
@@ -355,6 +368,7 @@ 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
@@ -536,6 +550,7 @@ 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
@@ -558,8 +573,10 @@ 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 ?
@@ -666,9 +683,11 @@ 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:
diff -purN a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
--- a/arch/s390/kernel/process.c 2006-06-06 02:57:02.000000000 +0200
+++ b/arch/s390/kernel/process.c 2006-06-14 15:12:26.000000000 +0200
@@ -143,6 +143,7 @@ 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 -purN a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
--- a/drivers/s390/char/sclp.c 2006-06-06 02:57:02.000000000 +0200
+++ b/drivers/s390/char/sclp.c 2006-06-14 15:12:26.000000000 +0200
@@ -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_irq_restore(flags);
}
EXPORT_SYMBOL(sclp_sync_wait);
diff -purN a/include/asm-s390/irqflags.h b/include/asm-s390/irqflags.h
--- a/include/asm-s390/irqflags.h 1970-01-01 01:00:00.000000000 +0100
+++ b/include/asm-s390/irqflags.h 2006-06-14 15:25:44.000000000 +0200
@@ -0,0 +1,50 @@
+/*
+ * include/asm-s390/irqflags.h
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Heiko Carstens <[email protected]>
+ */
+
+#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 -purN a/include/asm-s390/system.h b/include/asm-s390/system.h
--- a/include/asm-s390/system.h 2006-06-14 15:11:29.000000000 +0200
+++ b/include/asm-s390/system.h 2006-06-14 15:12:26.000000000 +0200
@@ -301,34 +301,6 @@ __cmpxchg(volatile void *ptr, unsigned l
#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 l
})
#endif /* __s390x__ */
-/* For spinlocks etc */
-#define local_irq_save(x) ((x) = local_irq_disable())
+#include <linux/trace_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
-
-
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