diff options
| author | Jack Steiner <steiner@sgi.com> | 2009-06-17 16:28:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-18 13:04:02 -0700 |
| commit | 1a2c09e3b41e334b6651d53b39cfe8ceefbc45f8 (patch) | |
| tree | f005fcb5c5251256767b15f4a23ee220e6de5c88 /drivers/misc/sgi-gru/grufault.c | |
| parent | 270952a907220c0331fdaecbb55df892921c5e2d (diff) | |
gru: fix cache coherency issues with instruction retry
Fix two problems related to GRU instruction failures. Cache coherency is
not maintained for CBEs except when loading or unloading contexts. When
reading a CBE to extract error information, the CBE must first be flushed
from the cache.
The function that reads kerrnel CBEs was reading the wrong CBE.
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 | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index a489807613f8..6d0681236db5 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -614,7 +614,7 @@ int gru_get_exception_detail(unsigned long arg) } else if (gts->ts_gru) { cbrnum = thread_cbr_number(gts, ucbnum); cbe = get_cbe_by_index(gts->ts_gru, cbrnum); - prefetchw(cbe);/* Harmless on hardware, required for emulator */ + gru_flush_cache(cbe); /* CBE not coherent */ excdet.opc = cbe->opccpy; excdet.exopc = cbe->exopccpy; excdet.ecause = cbe->ecause; @@ -622,6 +622,7 @@ int gru_get_exception_detail(unsigned long arg) excdet.exceptdet1 = cbe->idef3upd; excdet.cbrstate = cbe->cbrstate; excdet.cbrexecstatus = cbe->cbrexecstatus; + gru_flush_cache(cbe); ret = 0; } else { ret = -EAGAIN; |