[PATCH 01/28] eal: introduce I/O device memory barriers
From: Jerin Jacob <hidden>
Date: 2016-12-14 01:57:19
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
This commit introduce rte_io_mb(), rte_io_wmb() and rte_io_rmb(), in order to enable memory barriers between I/O device and CPU. Signed-off-by: Jerin Jacob <redacted> --- lib/librte_eal/common/include/generic/rte_atomic.h | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/lib/librte_eal/common/include/generic/rte_atomic.h b/lib/librte_eal/common/include/generic/rte_atomic.h
index 43a704e..7b81705 100644
--- a/lib/librte_eal/common/include/generic/rte_atomic.h
+++ b/lib/librte_eal/common/include/generic/rte_atomic.h@@ -100,6 +100,33 @@ static inline void rte_smp_wmb(void); */ static inline void rte_smp_rmb(void); +/** + * General memory barrier for I/O device + * + * Guarantees that the LOAD and STORE operations that precede the + * rte_io_mb() call are visible to I/O device or CPU before the + * LOAD and STORE operations that follow it. + */ +static inline void rte_io_mb(void); + +/** + * Write memory barrier for I/O device + * + * Guarantees that the STORE operations that precede the + * rte_io_wmb() call are visible to I/O device before the STORE + * operations that follow it. + */ +static inline void rte_io_wmb(void); + +/** + * Read memory barrier for IO device + * + * Guarantees that the LOAD operations on I/O device that precede the + * rte_io_rmb() call are visible to CPU before the LOAD + * operations that follow it. + */ +static inline void rte_io_rmb(void); + #endif /* __DOXYGEN__ */ /**
--
2.5.5