diff options
Diffstat (limited to 'include/asm-parisc/tlbflush.h')
| -rw-r--r-- | include/asm-parisc/tlbflush.h | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/include/asm-parisc/tlbflush.h b/include/asm-parisc/tlbflush.h index eb27b78930e..84af4ab1fe5 100644 --- a/include/asm-parisc/tlbflush.h +++ b/include/asm-parisc/tlbflush.h @@ -7,6 +7,26 @@ #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. */ +#ifdef CONFIG_SMP +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) + +#else + +#define purge_tlb_start(x) do { } while(0) +#define purge_tlb_end(x) do { } while (0) + +#endif + + extern void flush_tlb_all(void); /* @@ -64,29 +84,26 @@ static inline void flush_tlb_range(struct vm_area_struct *vma, { 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(); } } |