eal: add generic I/O device read/write implementation

This patch implements the generic version of rte_read[b/w/l/q]_[relaxed]
and rte_write[b/w/l/q]_[relaxed] using rte_io_wmb() and rte_io_rmb()

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>

diff --git a/lib/librte_eal/common/include/generic/rte_io.h b/lib/librte_eal/common/include/generic/rte_io.h
index edfebf8..d82ee69 100644 (file)
--- a/lib/librte_eal/common/include/generic/rte_io.h
+++ b/lib/librte_eal/common/include/generic/rte_io.h
@@ -34,6 +34,8 @@
 #ifndef _RTE_IO_H_
 #define _RTE_IO_H_
 
+#include <rte_atomic.h>
+
 /**
  * @file
  * I/O device memory operations
@@ -260,4 +262,120 @@ rte_write64(uint64_t value, volatile void *addr);
 
 #endif /* __DOXYGEN__ */
 
+#ifndef RTE_OVERRIDE_IO_H
+
+static inline uint8_t __attribute__((always_inline))
+rte_read8_relaxed(const volatile void *addr)
+{
+       return *(const volatile uint8_t *)addr;
+}
+
+static inline uint16_t __attribute__((always_inline))
+rte_read16_relaxed(const volatile void *addr)
+{
+       return *(const volatile uint16_t *)addr;
+}
+
+static inline uint32_t __attribute__((always_inline))
+rte_read32_relaxed(const volatile void *addr)
+{
+       return *(const volatile uint32_t *)addr;
+}
+
+static inline uint64_t __attribute__((always_inline))
+rte_read64_relaxed(const volatile void *addr)
+{
+       return *(const volatile uint64_t *)addr;
+}
+
+static inline void __attribute__((always_inline))
+rte_write8_relaxed(uint8_t value, volatile void *addr)
+{
+       *(volatile uint8_t *)addr = value;
+}
+
+static inline void __attribute__((always_inline))
+rte_write16_relaxed(uint16_t value, volatile void *addr)
+{
+       *(volatile uint16_t *)addr = value;
+}
+
+static inline void __attribute__((always_inline))
+rte_write32_relaxed(uint32_t value, volatile void *addr)
+{
+       *(volatile uint32_t *)addr = value;
+}
+
+static inline void __attribute__((always_inline))
+rte_write64_relaxed(uint64_t value, volatile void *addr)
+{
+       *(volatile uint64_t *)addr = value;
+}
+
+static inline uint8_t __attribute__((always_inline))
+rte_read8(const volatile void *addr)
+{
+       uint8_t val;
+       val = rte_read8_relaxed(addr);
+       rte_io_rmb();
+       return val;
+}
+
+static inline uint16_t __attribute__((always_inline))
+rte_read16(const volatile void *addr)
+{
+       uint16_t val;
+       val = rte_read16_relaxed(addr);
+       rte_io_rmb();
+       return val;
+}
+
+static inline uint32_t  __attribute__((always_inline))
+rte_read32(const volatile void *addr)
+{
+       uint32_t val;
+       val = rte_read32_relaxed(addr);
+       rte_io_rmb();
+       return val;
+}
+
+static inline uint64_t __attribute__((always_inline))
+rte_read64(const volatile void *addr)
+{
+       uint64_t val;
+       val = rte_read64_relaxed(addr);
+       rte_io_rmb();
+       return val;
+}
+
+static inline void __attribute__((always_inline))
+rte_write8(uint8_t value, volatile void *addr)
+{
+       rte_io_wmb();
+       rte_write8_relaxed(value, addr);
+}
+
+static inline void __attribute__((always_inline))
+rte_write16(uint16_t value, volatile void *addr)
+{
+       rte_io_wmb();
+       rte_write16_relaxed(value, addr);
+}
+
+static inline void __attribute__((always_inline))
+rte_write32(uint32_t value, volatile void *addr)
+{
+       rte_io_wmb();
+       rte_write32_relaxed(value, addr);
+}
+
+static inline void __attribute__((always_inline))
+rte_write64(uint64_t value, volatile void *addr)
+{
+       rte_io_wmb();
+       rte_write64_relaxed(value, addr);
+}
+
+#endif /* RTE_OVERRIDE_IO_H */
+
 #endif /* _RTE_IO_H_ */