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| author | John Keller <jpk@sgi.com> | 2007-08-22 19:32:06 -0500 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2007-09-01 02:49:57 -0700 |
| commit | 6e9de18120988388cdae5097c09e774416d58745 (patch) | |
| tree | 04f7de7bee8d38a4e871970afda136bb5ac853be /arch/ia64/sn/kernel/sn2/sn2_smp.c | |
| parent | 1aac0b5739ae192ee812eee09625ebfc08c2d760 (diff) | |
| download | op-kernel-dev-6e9de18120988388cdae5097c09e774416d58745.zip op-kernel-dev-6e9de18120988388cdae5097c09e774416d58745.tar.gz | |
[IA64] SN: Add support for CPU disable
Add additional support for CPU disable on SN platforms.
Correctly setup the smp_affinity mask for I/O error IRQs.
Restrict the use of the feature to Altix 4000 and 450 systems
running with a CPU disable capable PROM, and do not allow disabling
of CPU 0.
Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn/kernel/sn2/sn2_smp.c')
| -rw-r--r-- | arch/ia64/sn/kernel/sn2/sn2_smp.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c index 033c8a9..f3c6932 100644 --- a/arch/ia64/sn/kernel/sn2/sn2_smp.c +++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c @@ -40,6 +40,7 @@ #include <asm/sn/shub_mmr.h> #include <asm/sn/nodepda.h> #include <asm/sn/rw_mmr.h> +#include <asm/sn/sn_feature_sets.h> DEFINE_PER_CPU(struct ptc_stats, ptcstats); DECLARE_PER_CPU(struct ptc_stats, ptcstats); @@ -429,6 +430,31 @@ void sn2_send_IPI(int cpuid, int vector, int delivery_mode, int redirect) sn_send_IPI_phys(nasid, physid, vector, delivery_mode); } +#ifdef CONFIG_HOTPLUG_CPU +/** + * sn_cpu_disable_allowed - Determine if a CPU can be disabled. + * @cpu - CPU that is requested to be disabled. + * + * CPU disable is only allowed on SHub2 systems running with a PROM + * that supports CPU disable. It is not permitted to disable the boot processor. + */ +bool sn_cpu_disable_allowed(int cpu) +{ + if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) { + if (cpu != 0) + return true; + else + printk(KERN_WARNING + "Disabling the boot processor is not allowed.\n"); + + } else + printk(KERN_WARNING + "CPU disable is not supported on this system.\n"); + + return false; +} +#endif /* CONFIG_HOTPLUG_CPU */ + #ifdef CONFIG_PROC_FS #define PTC_BASENAME "sgi_sn/ptc_statistics" |
