Add a mthca_write_db_rec() to wrap writing doorbell records. On
64-bit archs, this is just a 64-bit write, while on 32-bit archs it
splits the write into two 32-bit writes with a memory barrier to make
sure the two halves of the record are written in the correct order.
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
--- linux-export.orig/drivers/infiniband/hw/mthca/mthca_doorbell.h
2005-01-25 20:49:05.000000000 -0800
+++ linux-export/drivers/infiniband/hw/mthca/mthca_doorbell.h 2005-03-03
14:12:59.570990692 -0800
@@ -57,6 +57,11 @@
__raw_writeq(*(u64 *) val, dest);
}
+static inline void mthca_write_db_rec(u32 val[2], u32 *db)
+{
+ *(u64 *) db = *(u64 *) val;
+}
+
#else
/*
@@ -80,4 +85,11 @@
spin_unlock_irqrestore(doorbell_lock, flags);
}
+static inline void mthca_write_db_rec(u32 val[2], u32 *db)
+{
+ db[0] = val[0];
+ wmb();
+ db[1] = val[1];
+}
+
#endif
-
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