sparc64: Handle extremely large kernel TSB range flushes sanely.

[ Upstream commit 849c498766060a16aad5b0e0d03206726e7d2fa4 ]

If the number of pages we are flushing is more than twice the number
of entries in the TSB, just scan the TSB table for matches rather
than probing each and every page in the range.

Based upon a patch and report by James Clarke.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index 6725ed45580e525cf5567b1b9ccbeb2c723738bf..9cdeca0fa9556ed823299ee4d81d89c515f60339 100644 (file)
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -27,6 +27,20 @@ static inline int tag_compare(unsigned long tag, unsigned long vaddr)
        return (tag == (vaddr >> 22));
 }
 
+static void flush_tsb_kernel_range_scan(unsigned long start, unsigned long end)
+{
+       unsigned long idx;
+
+       for (idx = 0; idx < KERNEL_TSB_NENTRIES; idx++) {
+               struct tsb *ent = &swapper_tsb[idx];
+               unsigned long match = idx << 13;
+
+               match |= (ent->tag << 22);
+               if (match >= start && match < end)
+                       ent->tag = (1UL << TSB_TAG_INVALID_BIT);
+       }
+}
+
 /* TSB flushes need only occur on the processor initiating the address
  * space modification, not on each cpu the address space has run on.
  * Only the TLB flush needs that treatment.
@@ -36,6 +50,9 @@ void flush_tsb_kernel_range(unsigned long start, unsigned long end)
 {
        unsigned long v;
 
+       if ((end - start) >> PAGE_SHIFT >= 2 * KERNEL_TSB_NENTRIES)
+               return flush_tsb_kernel_range_scan(start, end);
+
        for (v = start; v < end; v += PAGE_SIZE) {
                unsigned long hash = tsb_hash(v, PAGE_SHIFT,
                                              KERNEL_TSB_NENTRIES);