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| author | jhb <jhb@FreeBSD.org> | 2005-09-15 17:09:42 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2005-09-15 17:09:42 +0000 |
| commit | cde6672474c8f8ad8688f3c6f1d1f35cb3d29539 (patch) | |
| tree | 8fd7e52c45ba14c4bbe18ca99169c6a164bf0b53 /sys/alpha | |
| parent | 32a45dd89e052b5b59f8cdde303861e41a0069d8 (diff) | |
| download | FreeBSD-src-cde6672474c8f8ad8688f3c6f1d1f35cb3d29539.zip FreeBSD-src-cde6672474c8f8ad8688f3c6f1d1f35cb3d29539.tar.gz | |
Add a memory barrier for PREWRITE operations to ensure all writes by the
CPU have drained before further writes to kick off the operation.
MFC after: 1 week
Diffstat (limited to 'sys/alpha')
| -rw-r--r-- | sys/alpha/alpha/busdma_machdep.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/alpha/alpha/busdma_machdep.c b/sys/alpha/alpha/busdma_machdep.c index ee2ee41..a7eb1c5 100644 --- a/sys/alpha/alpha/busdma_machdep.c +++ b/sys/alpha/alpha/busdma_machdep.c @@ -891,6 +891,10 @@ _bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) } } } + + /* Ensure any pending writes have drained. */ + if (op & (BUS_DMASYNC_PREWRITE)) + alpha_mb(); } static void |
