#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);
*
* SN2 PIO writes from separate CPUs are not guaranteed to arrive in order.
* Context switching user threads which have memory-mapped MMIO may cause
- * PIOs to issue from seperate CPUs, thus the PIO writes must be drained
+ * PIOs to issue from separate CPUs, thus the PIO writes must be drained
* from the previous CPU's Shub before execution resumes on the new CPU.
*/
void sn_migrate(struct task_struct *task)
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"