diff options
Diffstat (limited to 'arch/s390/kernel/smp.c')
| -rw-r--r-- | arch/s390/kernel/smp.c | 73 |
1 files changed, 64 insertions, 9 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 6ab16ac64d2..3ea872890da 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -38,6 +38,7 @@ #include <linux/timex.h> #include <linux/bootmem.h> #include <linux/slab.h> +#include <linux/crash_dump.h> #include <asm/asm-offsets.h> #include <asm/ipl.h> #include <asm/setup.h> @@ -97,6 +98,29 @@ static inline int cpu_stopped(int cpu) return raw_cpu_stopped(cpu_logical_map(cpu)); } +/* + * Ensure that PSW restart is done on an online CPU + */ +void smp_restart_with_online_cpu(void) +{ + int cpu; + + for_each_online_cpu(cpu) { + if (stap() == __cpu_logical_map[cpu]) { + /* We are online: Enable DAT again and return */ + __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); + return; + } + } + /* We are not online: Do PSW restart on an online CPU */ + while (sigp(cpu, sigp_restart) == sigp_busy) + cpu_relax(); + /* And stop ourself */ + while (raw_sigp(stap(), sigp_stop) == sigp_busy) + cpu_relax(); + for (;;); +} + void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) { struct _lowcore *lc, *current_lc; @@ -106,14 +130,16 @@ void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) if (smp_processor_id() == 0) func(data); - __load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY); + __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | + PSW_MASK_EA | PSW_MASK_BA); /* Disable lowcore protection */ __ctl_clear_bit(0, 28); current_lc = lowcore_ptr[smp_processor_id()]; lc = lowcore_ptr[0]; if (!lc) lc = current_lc; - lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; + lc->restart_psw.mask = + PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu; if (!cpu_online(0)) smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]); @@ -135,7 +161,7 @@ void smp_send_stop(void) int cpu, rc; /* Disable all interrupts/machine checks */ - __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); + __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); trace_hardirqs_off(); /* stop all processors */ @@ -161,7 +187,10 @@ static void do_ext_call_interrupt(unsigned int ext_int_code, { unsigned long bits; - kstat_cpu(smp_processor_id()).irqs[EXTINT_IPI]++; + if (ext_int_code == 0x1202) + kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++; + else + kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++; /* * handle bit signal external calls */ @@ -183,12 +212,19 @@ static void do_ext_call_interrupt(unsigned int ext_int_code, */ static void smp_ext_bitcall(int cpu, int sig) { + int order; + /* * Set signaling bit in lowcore of target cpu and kick it */ set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); - while (sigp(cpu, sigp_emergency_signal) == sigp_busy) + while (1) { + order = smp_vcpu_scheduled(cpu) ? + sigp_external_call : sigp_emergency_signal; + if (sigp(cpu, order) != sigp_busy) + break; udelay(10); + } } void arch_send_call_function_ipi_mask(const struct cpumask *mask) @@ -281,11 +317,13 @@ void smp_ctl_clear_bit(int cr, int bit) } EXPORT_SYMBOL(smp_ctl_clear_bit); -#ifdef CONFIG_ZFCPDUMP +#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP) static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { - if (ipl_info.type != IPL_TYPE_FCP_DUMP) + if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) + return; + if (is_kdump_kernel()) return; if (cpu >= NR_CPUS) { pr_warning("CPU %i exceeds the maximum %i and is excluded from " @@ -403,6 +441,18 @@ static void __init smp_detect_cpus(void) info = kmalloc(sizeof(*info), GFP_KERNEL); if (!info) panic("smp_detect_cpus failed to allocate memory\n"); +#ifdef CONFIG_CRASH_DUMP + if (OLDMEM_BASE && !is_kdump_kernel()) { + struct save_area *save_area; + + save_area = kmalloc(sizeof(*save_area), GFP_KERNEL); + if (!save_area) + panic("could not allocate memory for save area\n"); + copy_oldmem_page(1, (void *) save_area, sizeof(*save_area), + 0x200, 0); + zfcpdump_save_areas[0] = save_area; + } +#endif /* Use sigp detection algorithm if sclp doesn't work. */ if (sclp_get_cpu_info(info)) { smp_use_sigp_detection = 1; @@ -463,7 +513,8 @@ int __cpuinit start_secondary(void *cpuvoid) set_cpu_online(smp_processor_id(), true); ipi_call_unlock(); __ctl_clear_bit(0, 28); /* Disable lowcore protection */ - S390_lowcore.restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; + S390_lowcore.restart_psw.mask = + PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; S390_lowcore.restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; __ctl_set_bit(0, 28); /* Enable lowcore protection */ @@ -511,7 +562,8 @@ static int __cpuinit smp_alloc_lowcore(int cpu) memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); lowcore->async_stack = async_stack + ASYNC_SIZE; lowcore->panic_stack = panic_stack + PAGE_SIZE; - lowcore->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; + lowcore->restart_psw.mask = + PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; lowcore->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) restart_int_handler; if (user_mode != HOME_SPACE_MODE) @@ -712,6 +764,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus) /* request the 0x1201 emergency signal external interrupt */ if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) panic("Couldn't request external interrupt 0x1201"); + /* request the 0x1202 external call external interrupt */ + if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) + panic("Couldn't request external interrupt 0x1202"); /* Reallocate current lowcore, but keep its contents. */ lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |