diff options
| author | Jack Steiner <steiner@sgi.com> | 2009-12-15 16:48:11 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:15 -0800 |
| commit | 67bf04a5c2574e9495f660f418f6df776821d578 (patch) | |
| tree | ff28ab4983b007136da88786c8966ea1598841a0 /drivers/misc/sgi-gru/grukservices.c | |
| parent | e006043a4d2da52bba9fd9cb7e5a22e2951ff69b (diff) | |
| download | lwn-67bf04a5c2574e9495f660f418f6df776821d578.tar.gz lwn-67bf04a5c2574e9495f660f418f6df776821d578.zip | |
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.c | 10 |
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; } |