/* TLB flushing routines.... */
-#include <linux/config.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>
+
+/* This is for the serialisation of PxTLB broadcasts. At least on the
+ * N class systems, only one PxTLB inter processor broadcast can be
+ * active at any one time on the Merced bus. This tlb purge
+ * synchronisation is fairly lightweight and harmless so we activate
+ * it on all SMP systems not just the N class. We also need to have
+ * preemption disabled on uniprocessor machines, and spin_lock does that
+ * nicely.
+ */
+extern spinlock_t pa_tlb_lock;
+
+#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
+#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
+
extern void flush_tlb_all(void);
+extern void flush_tlb_all_local(void *);
/*
* flush_tlb_mm()
{
unsigned long npages;
-
npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (npages >= 512) /* XXX arbitrary, should be tuned */
+ if (npages >= 512) /* 2MB of space: arbitrary, should be tuned */
flush_tlb_all();
else {
-
mtsp(vma->vm_mm->context,1);
+ purge_tlb_start();
if (split_tlb) {
- purge_tlb_start();
while (npages--) {
pdtlb(start);
pitlb(start);
start += PAGE_SIZE;
}
- purge_tlb_end();
} else {
- purge_tlb_start();
while (npages--) {
pdtlb(start);
start += PAGE_SIZE;
}
- purge_tlb_end();
}
+ purge_tlb_end();
}
}