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authorJack Steiner <steiner@sgi.com>2009-12-15 16:48:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:15 -0800
commit67bf04a5c2574e9495f660f418f6df776821d578 (patch)
treeff28ab4983b007136da88786c8966ea1598841a0 /drivers/misc/sgi-gru/grukservices.c
parente006043a4d2da52bba9fd9cb7e5a22e2951ff69b (diff)
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gru: fix prefetch and speculation bugs
Fix several bugs related to prefetch, ordering & speculation: - GRU cch_allocate() instruction causes cacheable memory to be created. Add a barriers to prevent speculation from prefetching data before it exists. - Add memory barriers before cache-flush instructions to ensure that previously stored data is included in the line flushed to memory. 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>
Diffstat (limited to 'drivers/misc/sgi-gru/grukservices.c')
-rw-r--r--drivers/misc/sgi-gru/grukservices.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index 24ec109e61cc..8c81aca0463a 100644
--- a/drivers/misc/sgi-gru/grukservices.c
+++ b/drivers/misc/sgi-gru/grukservices.c
@@ -395,6 +395,7 @@ int gru_get_cb_exception_detail(void *cb,
cbrnum = thread_cbr_number(bs->bs_kgts, get_cb_number(cb));
cbe = get_cbe(GRUBASE(cb), cbrnum);
gru_flush_cache(cbe); /* CBE not coherent */
+ sync_core();
excdet->opc = cbe->opccpy;
excdet->exopc = cbe->exopccpy;
excdet->ecause = cbe->ecause;
@@ -461,9 +462,10 @@ int gru_check_status_proc(void *cb)
int ret;
ret = gen->istatus;
- if (ret != CBS_EXCEPTION)
- return ret;
- return gru_retry_exception(cb);
+ if (ret == CBS_EXCEPTION)
+ ret = gru_retry_exception(cb);
+ rmb();
+ return ret;
}
@@ -475,7 +477,7 @@ int gru_wait_proc(void *cb)
ret = gru_wait_idle_or_exception(gen);
if (ret == CBS_EXCEPTION)
ret = gru_retry_exception(cb);
-
+ rmb();
return ret;
}