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/grufault.c | |
| parent | gru: check for valid vma (diff) | |
| download | linux-dev-67bf04a5c2574e9495f660f418f6df776821d578.tar.xz linux-dev-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/grufault.c')
| -rw-r--r-- | drivers/misc/sgi-gru/grufault.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index 7466234450f3..d3cacd696b38 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -333,6 +333,7 @@ static int gru_try_dropin(struct gru_thread_state *gts, */ if (tfh->status != TFHSTATUS_EXCEPTION) { gru_flush_cache(tfh); + sync_core(); if (tfh->status != TFHSTATUS_EXCEPTION) goto failnoexception; STAT(tfh_stale_on_fault); @@ -599,6 +600,7 @@ int gru_get_exception_detail(unsigned long arg) cbrnum = thread_cbr_number(gts, ucbnum); cbe = get_cbe_by_index(gts->ts_gru, cbrnum); gru_flush_cache(cbe); /* CBE not coherent */ + sync_core(); /* make sure we are have current data */ excdet.opc = cbe->opccpy; excdet.exopc = cbe->exopccpy; excdet.ecause = cbe->ecause; |