From f64ca21714f114a78b6c19ceabc7745b29913efc Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 26 Feb 2010 22:37:32 +0100 Subject: [S390] zfcpdump: remove cross arch dump support Remove support to be able to dump 31 bit systems with a 64 bit dumper. This is mostly useless since no distro ships 31 bit kernels together with a 64 bit dumper. We also get rid of a bit of hacky code. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/smp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/s390/include/asm/smp.h') diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 2ab1141..9d2acb0 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -29,7 +29,7 @@ extern int smp_cpu_polarization[]; extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); -extern union save_area *zfcpdump_save_areas[NR_CPUS + 1]; +extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; #endif /* CONFIG_SMP */ -- cgit v1.1 From 2c2df118a6440748e6fd71a510a66ee708c31494 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 26 Feb 2010 22:37:34 +0100 Subject: [S390] smp: always reboot on cpu 0 Always reboot on logical cpu 0. This makes sure that the IPL cpu is always the same and usually avoids strange numbering schemes between physical and logical cpus. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/smp.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'arch/s390/include/asm/smp.h') diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 9d2acb0..c2d0e63 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -31,6 +31,18 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; +extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *); +extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp, + int from, int to); +extern void smp_restart_cpu(void); + +#else /* CONFIG_SMP */ + +static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) +{ + func(data); +} + #endif /* CONFIG_SMP */ #ifdef CONFIG_HOTPLUG_CPU -- cgit v1.1 From 59b697874529f5c3cbcaf5816b3d6c584af521e8 Mon Sep 17 00:00:00 2001 From: Gerald Schaefer Date: Fri, 26 Feb 2010 22:37:40 +0100 Subject: [S390] spinlock: check virtual cpu running status This patch introduces a new function that checks the running status of a cpu in a hypervisor. This status is not virtualized, so the check is only correct if running in an LPAR. On acquiring a spinlock, if the cpu holding the lock is scheduled by the hypervisor, we do a busy wait on the lock. If it is not scheduled, we yield over to that cpu. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/smp.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'arch/s390/include/asm/smp.h') diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index c2d0e63..edc03cb 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -36,6 +36,28 @@ extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp, int from, int to); extern void smp_restart_cpu(void); +/* + * returns 1 if (virtual) cpu is scheduled + * returns 0 otherwise + */ +static inline int smp_vcpu_scheduled(int cpu) +{ + u32 status; + + switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) { + case sigp_status_stored: + /* Check for running status */ + if (status & 0x400) + return 0; + break; + case sigp_not_operational: + return 0; + default: + break; + } + return 1; +} + #else /* CONFIG_SMP */ static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) @@ -43,6 +65,8 @@ static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) func(data); } +#define smp_vcpu_scheduled (1) + #endif /* CONFIG_SMP */ #ifdef CONFIG_HOTPLUG_CPU -- cgit v1.1