From 6377981faf1a4425b0531e577736ef03df97c8f6 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 17 May 2010 10:00:03 +0200 Subject: [S390] idle time accounting vs. machine checks A machine check can interrupt the i/o and external interrupt handler anytime. If the machine check occurs while the interrupt handler is waking up from idle vtime_start_cpu can get executed a second time and the int_clock / async_enter_timer values in the lowcore get clobbered. This can confuse the cpu time accounting. To fix this problem two changes are needed. First the machine check handler has to use its own copies of int_clock and async_enter_timer, named mcck_clock and mcck_enter_timer. Second the nested execution of vtime_start_cpu has to be prevented. This is done in s390_idle_check by checking the wait bit in the program status word. Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/asm-offsets.c | 2 ++ arch/s390/kernel/entry.S | 54 ++++++++++++++++++++---------------------- arch/s390/kernel/entry64.S | 54 ++++++++++++++++++++---------------------- arch/s390/kernel/nmi.c | 3 ++- arch/s390/kernel/s390_ext.c | 3 ++- arch/s390/kernel/vtime.c | 15 +++++++----- 6 files changed, 67 insertions(+), 64 deletions(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 32b1ede..816d81f 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -112,6 +112,7 @@ int main(void) DEFINE(__LC_RETURN_MCCK_PSW, offsetof(struct _lowcore, return_mcck_psw)); DEFINE(__LC_SYNC_ENTER_TIMER, offsetof(struct _lowcore, sync_enter_timer)); DEFINE(__LC_ASYNC_ENTER_TIMER, offsetof(struct _lowcore, async_enter_timer)); + DEFINE(__LC_MCCK_ENTER_TIMER, offsetof(struct _lowcore, mcck_enter_timer)); DEFINE(__LC_EXIT_TIMER, offsetof(struct _lowcore, exit_timer)); DEFINE(__LC_USER_TIMER, offsetof(struct _lowcore, user_timer)); DEFINE(__LC_SYSTEM_TIMER, offsetof(struct _lowcore, system_timer)); @@ -127,6 +128,7 @@ int main(void) DEFINE(__LC_USER_ASCE, offsetof(struct _lowcore, user_asce)); DEFINE(__LC_USER_EXEC_ASCE, offsetof(struct _lowcore, user_exec_asce)); DEFINE(__LC_INT_CLOCK, offsetof(struct _lowcore, int_clock)); + DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock)); DEFINE(__LC_MACHINE_FLAGS, offsetof(struct _lowcore, machine_flags)); DEFINE(__LC_FTRACE_FUNC, offsetof(struct _lowcore, ftrace_func)); DEFINE(__LC_IRB, offsetof(struct _lowcore, irb)); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 07d8499..0e2b162 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -742,15 +742,14 @@ __critical_end: .globl mcck_int_handler mcck_int_handler: - stck __LC_INT_CLOCK + stck __LC_MCCK_CLOCK spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs SAVE_ALL_BASE __LC_SAVE_AREA+32 la %r12,__LC_MCK_OLD_PSW tm __LC_MCCK_CODE,0x80 # system damage? bo BASED(mcck_int_main) # yes -> rest of mcck code invalid - mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER - mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA + mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? bo BASED(1f) la %r14,__LC_SYNC_ENTER_TIMER @@ -764,7 +763,7 @@ mcck_int_handler: bl BASED(0f) la %r14,__LC_LAST_UPDATE_TIMER 0: spt 0(%r14) - mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) + mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? bno BASED(mcck_int_main) # no -> skip cleanup critical tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit @@ -786,9 +785,9 @@ mcck_int_main: bno BASED(mcck_no_vtime) # no -> skip cleanup critical tm SP_PSW+1(%r15),0x01 # interrupting from user ? bz BASED(mcck_no_vtime) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER mcck_no_vtime: l %r9,__LC_THREAD_INFO # load pointer to thread_info struct la %r2,SP_PTREGS(%r15) # load pt_regs @@ -811,7 +810,6 @@ mcck_no_vtime: 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 - mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? bno BASED(0f) lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 @@ -934,15 +932,16 @@ cleanup_critical: cleanup_system_call: mvc __LC_RETURN_PSW(8),0(%r12) - c %r12,BASED(.Lmck_old_psw) - be BASED(0f) - la %r12,__LC_SAVE_AREA+16 - b BASED(1f) -0: la %r12,__LC_SAVE_AREA+32 -1: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) bh BASED(0f) + mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER + c %r12,BASED(.Lmck_old_psw) + be BASED(0f) mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: c %r12,BASED(.Lmck_old_psw) + la %r12,__LC_SAVE_AREA+32 + be BASED(0f) + la %r12,__LC_SAVE_AREA+16 0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) bhe BASED(cleanup_vtime) clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) @@ -984,16 +983,19 @@ cleanup_sysc_tif: cleanup_sysc_restore: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) be BASED(2f) + mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER + c %r12,BASED(.Lmck_old_psw) + be BASED(0f) mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER - clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) +0: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) be BASED(2f) mvc __LC_RETURN_PSW(8),SP_PSW(%r15) c %r12,BASED(.Lmck_old_psw) - bne BASED(0f) - mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) - b BASED(1f) -0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) -1: lm %r0,%r11,SP_R0(%r15) + la %r12,__LC_SAVE_AREA+32 + be BASED(1f) + la %r12,__LC_SAVE_AREA+16 +1: mvc 0(16,%r12),SP_R12(%r15) + lm %r0,%r11,SP_R0(%r15) l %r15,SP_R15(%r15) 2: la %r12,__LC_RETURN_PSW br %r14 @@ -1009,19 +1011,15 @@ cleanup_io_tif: cleanup_io_restore: clc 4(4,%r12),BASED(cleanup_io_restore_insn) - be BASED(2f) - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + be BASED(1f) + mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) - be BASED(2f) + be BASED(1f) mvc __LC_RETURN_PSW(8),SP_PSW(%r15) - c %r12,BASED(.Lmck_old_psw) - bne BASED(0f) mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) - b BASED(1f) -0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15) -1: lm %r0,%r11,SP_R0(%r15) + lm %r0,%r11,SP_R0(%r15) l %r15,SP_R15(%r15) -2: la %r12,__LC_RETURN_PSW +1: la %r12,__LC_RETURN_PSW br %r14 cleanup_io_restore_insn: .long io_done - 4 + 0x80000000 diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 860cea1..6536f5c 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -725,7 +725,7 @@ __critical_end: */ .globl mcck_int_handler mcck_int_handler: - stck __LC_INT_CLOCK + stck __LC_MCCK_CLOCK la %r1,4095 # revalidate r1 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs @@ -734,8 +734,7 @@ mcck_int_handler: tm __LC_MCCK_CODE,0x80 # system damage? jo mcck_int_main # yes -> rest of mcck code invalid la %r14,4095 - mvc __LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER - mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14) + mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14) tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? jo 1f la %r14,__LC_SYNC_ENTER_TIMER @@ -749,7 +748,7 @@ mcck_int_handler: jl 0f la %r14,__LC_LAST_UPDATE_TIMER 0: spt 0(%r14) - mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14) + mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? jno mcck_int_main # no -> skip cleanup critical tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit @@ -770,9 +769,9 @@ mcck_int_main: jno mcck_no_vtime # no -> no timer update tm SP_PSW+1(%r15),0x01 # interrupting from user ? jz mcck_no_vtime - UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER mcck_no_vtime: lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct la %r2,SP_PTREGS(%r15) # load pt_regs @@ -794,7 +793,6 @@ 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 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 - mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? jno 0f stpt __LC_EXIT_TIMER @@ -909,15 +907,16 @@ cleanup_critical: cleanup_system_call: mvc __LC_RETURN_PSW(16),0(%r12) - cghi %r12,__LC_MCK_OLD_PSW - je 0f - la %r12,__LC_SAVE_AREA+32 - j 1f -0: la %r12,__LC_SAVE_AREA+64 -1: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8) jh 0f + mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER + cghi %r12,__LC_MCK_OLD_PSW + je 0f mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: cghi %r12,__LC_MCK_OLD_PSW + la %r12,__LC_SAVE_AREA+64 + je 0f + la %r12,__LC_SAVE_AREA+32 0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16) jhe cleanup_vtime clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn) @@ -958,19 +957,22 @@ cleanup_sysc_tif: cleanup_sysc_restore: clc 8(8,%r12),BASED(cleanup_sysc_restore_insn) - je 3f + je 2f clc 8(8,%r12),BASED(cleanup_sysc_restore_insn+8) jhe 0f + mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER + cghi %r12,__LC_MCK_OLD_PSW + je 0f mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER 0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) cghi %r12,__LC_MCK_OLD_PSW - jne 1f - mvc __LC_SAVE_AREA+64(32),SP_R12(%r15) - j 2f -1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) -2: lmg %r0,%r11,SP_R0(%r15) + la %r12,__LC_SAVE_AREA+64 + je 1f + la %r12,__LC_SAVE_AREA+32 +1: mvc 0(32,%r12),SP_R12(%r15) + lmg %r0,%r11,SP_R0(%r15) lg %r15,SP_R15(%r15) -3: la %r12,__LC_RETURN_PSW +2: la %r12,__LC_RETURN_PSW br %r14 cleanup_sysc_restore_insn: .quad sysc_done - 4 @@ -984,19 +986,15 @@ cleanup_io_tif: cleanup_io_restore: clc 8(8,%r12),BASED(cleanup_io_restore_insn) - je 3f + je 1f clc 8(8,%r12),BASED(cleanup_io_restore_insn+8) jhe 0f - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER 0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) - cghi %r12,__LC_MCK_OLD_PSW - jne 1f mvc __LC_SAVE_AREA+64(32),SP_R12(%r15) - j 2f -1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) -2: lmg %r0,%r11,SP_R0(%r15) + lmg %r0,%r11,SP_R0(%r15) lg %r15,SP_R15(%r15) -3: la %r12,__LC_RETURN_PSW +1: la %r12,__LC_RETURN_PSW br %r14 cleanup_io_restore_insn: .quad io_done - 4 diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c index 015e27d..ac15139 100644 --- a/arch/s390/kernel/nmi.c +++ b/arch/s390/kernel/nmi.c @@ -255,7 +255,8 @@ void notrace s390_do_machine_check(struct pt_regs *regs) int umode; nmi_enter(); - s390_idle_check(); + s390_idle_check(regs, S390_lowcore.mcck_clock, + S390_lowcore.mcck_enter_timer); mci = (struct mci *) &S390_lowcore.mcck_interruption_code; mcck = &__get_cpu_var(cpu_mcck); diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c index 59618bc..9ce641b 100644 --- a/arch/s390/kernel/s390_ext.c +++ b/arch/s390/kernel/s390_ext.c @@ -120,7 +120,8 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned short code) struct pt_regs *old_regs; old_regs = set_irq_regs(regs); - s390_idle_check(); + s390_idle_check(regs, S390_lowcore.int_clock, + S390_lowcore.async_enter_timer); irq_enter(); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index b59a812..3479f1b 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -121,32 +121,35 @@ void account_system_vtime(struct task_struct *tsk) } EXPORT_SYMBOL_GPL(account_system_vtime); -void vtime_start_cpu(void) +void vtime_start_cpu(__u64 int_clock, __u64 enter_timer) { struct s390_idle_data *idle = &__get_cpu_var(s390_idle); struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer); __u64 idle_time, expires; + if (idle->idle_enter == 0ULL) + return; + /* Account time spent with enabled wait psw loaded as idle time. */ - idle_time = S390_lowcore.int_clock - idle->idle_enter; + idle_time = int_clock - idle->idle_enter; account_idle_time(idle_time); S390_lowcore.steal_timer += idle->idle_enter - S390_lowcore.last_update_clock; - S390_lowcore.last_update_clock = S390_lowcore.int_clock; + S390_lowcore.last_update_clock = int_clock; /* Account system time spent going idle. */ S390_lowcore.system_timer += S390_lowcore.last_update_timer - vq->idle; - S390_lowcore.last_update_timer = S390_lowcore.async_enter_timer; + S390_lowcore.last_update_timer = enter_timer; /* Restart vtime CPU timer */ if (vq->do_spt) { /* Program old expire value but first save progress. */ - expires = vq->idle - S390_lowcore.async_enter_timer; + expires = vq->idle - enter_timer; expires += get_vtimer(); set_vtimer(expires); } else { /* Don't account the CPU timer delta while the cpu was idle. */ - vq->elapsed -= vq->idle - S390_lowcore.async_enter_timer; + vq->elapsed -= vq->idle - enter_timer; } idle->sequence++; -- cgit v1.1