gru: update to rev 0.9 of gru spec

Update GRU driver to the latest version of the GRU spec. This consists
of minor updates:
	- changes & additions to error status bits
	- new restriction on handling of TLB misses while in FMM mode
	- new field (not used by software) in TFH

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 8443e90f9f6c..a489807613f8 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -339,8 +339,12 @@ static int gru_try_dropin(struct gru_thread_state *gts,
          * Might be a hardware race OR a stupid user. Ignore FMM because FMM
          * is a transient state.
          */
-        if (tfh->status != TFHSTATUS_EXCEPTION)
-                goto failnoexception;
+        if (tfh->status != TFHSTATUS_EXCEPTION) {
+                gru_flush_cache(tfh);
+                if (tfh->status != TFHSTATUS_EXCEPTION)
+                        goto failnoexception;
+                STAT(tfh_stale_on_fault);
+        }
         if (tfh->state == TFHSTATE_IDLE)
                 goto failidle;
         if (tfh->state == TFHSTATE_MISS_FMM && cb)