[dpdk-dev] [PATCH v2 2/2] eal: remove RTE CIO barriers

From: Phil Yang <phil.yang@arm.com>
To: dev@dpdk.org
Cc: Honnappa.Nagarahalli@arm.com, Ruifeng.Wang@arm.com,
	joyce.kong@arm.com, nd@arm.com,
	John McNamara <john.mcnamara@intel.com>,
	Marko Kovacevic <marko.kovacevic@intel.com>,
	Jan Viktorin <viktorin@rehivetech.com>,
	Ruifeng Wang <ruifeng.wang@arm.com>,
	Jerin Jacob <jerinj@marvell.com>,
	David Christensen <drc@linux.vnet.ibm.com>,
	Bruce Richardson <bruce.richardson@intel.com>,
	Konstantin Ananyev <konstantin.ananyev@intel.com>
Subject: [dpdk-dev] [PATCH v2 2/2] eal: remove RTE CIO barriers
Date: Fri, 11 Sep 2020 13:26:37 +0800	[thread overview]
Message-ID: <1599801997-19880-3-git-send-email-phil.yang@arm.com> (raw)
In-Reply-To: <1599801997-19880-1-git-send-email-phil.yang@arm.com>

Remove the deprecated rte_cio_[rw]mb APIs.

Signed-off-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 doc/guides/rel_notes/release_20_11.rst      |  3 +++
 lib/librte_eal/arm/include/rte_atomic_32.h  |  4 ---
 lib/librte_eal/arm/include/rte_atomic_64.h  |  4 ---
 lib/librte_eal/include/generic/rte_atomic.h | 39 -----------------------------
 lib/librte_eal/ppc/include/rte_atomic.h     |  4 ---
 lib/librte_eal/x86/include/rte_atomic.h     |  4 ---
 6 files changed, 3 insertions(+), 55 deletions(-)

diff --git a/doc/guides/rel_notes/release_20_11.rst b/doc/guides/rel_notes/release_20_11.rst
index df227a1..7090caf 100644
--- a/doc/guides/rel_notes/release_20_11.rst
+++ b/doc/guides/rel_notes/release_20_11.rst
@@ -84,6 +84,9 @@ API Changes
    Also, make sure to start the actual text at the margin.
    =======================================================
 
+* eal: The ``rte_cio_rmb()`` and ``rte_cio_wmb()`` were deprecated since
+  20.08 and are removed in this release.
+
 
 ABI Changes
 -----------
diff --git a/lib/librte_eal/arm/include/rte_atomic_32.h b/lib/librte_eal/arm/include/rte_atomic_32.h
index 368f10c..9d0568d 100644
--- a/lib/librte_eal/arm/include/rte_atomic_32.h
+++ b/lib/librte_eal/arm/include/rte_atomic_32.h
@@ -33,10 +33,6 @@ extern "C" {
 
 #define rte_io_rmb() rte_rmb()
 
-#define rte_cio_wmb() rte_wmb()
-
-#define rte_cio_rmb() rte_rmb()
-
 static __rte_always_inline void
 rte_atomic_thread_fence(int memory_order)
 {
diff --git a/lib/librte_eal/arm/include/rte_atomic_64.h b/lib/librte_eal/arm/include/rte_atomic_64.h
index 5cae52d..c518559 100644
--- a/lib/librte_eal/arm/include/rte_atomic_64.h
+++ b/lib/librte_eal/arm/include/rte_atomic_64.h
@@ -37,10 +37,6 @@ extern "C" {
 
 #define rte_io_rmb() rte_rmb()
 
-#define rte_cio_wmb() rte_wmb()
-
-#define rte_cio_rmb() rte_rmb()
-
 static __rte_always_inline void
 rte_atomic_thread_fence(int memory_order)
 {
diff --git a/lib/librte_eal/include/generic/rte_atomic.h b/lib/librte_eal/include/generic/rte_atomic.h
index 95270f1..d1255b2 100644
--- a/lib/librte_eal/include/generic/rte_atomic.h
+++ b/lib/librte_eal/include/generic/rte_atomic.h
@@ -107,45 +107,6 @@ static inline void rte_io_wmb(void);
 static inline void rte_io_rmb(void);
 ///@}
 
-/** @name Coherent I/O Memory Barrier
- *
- * Coherent I/O memory barrier is a lightweight version of I/O memory
- * barriers which are system-wide data synchronization barriers. This
- * is for only coherent memory domain between lcore and I/O device but
- * it is same as the I/O memory barriers in most of architectures.
- * However, some architecture provides even lighter barriers which are
- * somewhere in between I/O memory barriers and SMP memory barriers.
- * For example, in case of ARMv8, DMB(data memory barrier) instruction
- * can have different shareability domains - inner-shareable and
- * outer-shareable. And inner-shareable DMB fits for SMP memory
- * barriers and outer-shareable DMB for coherent I/O memory barriers,
- * which acts on coherent memory.
- *
- * In most cases, I/O memory barriers are safer but if operations are
- * on coherent memory instead of incoherent MMIO region of a device,
- * then coherent I/O memory barriers can be used and this could bring
- * performance gain depending on architectures.
- */
-///@{
-/**
- * Write memory barrier for coherent memory between lcore and I/O device
- *
- * Guarantees that the STORE operations on coherent memory that
- * precede the rte_cio_wmb() call are visible to I/O device before the
- * STORE operations that follow it.
- */
-static inline void rte_cio_wmb(void);
-
-/**
- * Read memory barrier for coherent memory between lcore and I/O device
- *
- * Guarantees that the LOAD operations on coherent memory updated by
- * I/O device that precede the rte_cio_rmb() call are visible to CPU
- * before the LOAD operations that follow it.
- */
-static inline void rte_cio_rmb(void);
-///@}
-
 #endif /* __DOXYGEN__ */
 
 /**
diff --git a/lib/librte_eal/ppc/include/rte_atomic.h b/lib/librte_eal/ppc/include/rte_atomic.h
index 527fcaf..a919899 100644
--- a/lib/librte_eal/ppc/include/rte_atomic.h
+++ b/lib/librte_eal/ppc/include/rte_atomic.h
@@ -36,10 +36,6 @@ extern "C" {
 
 #define rte_io_rmb() rte_rmb()
 
-#define rte_cio_wmb() rte_wmb()
-
-#define rte_cio_rmb() rte_rmb()
-
 static __rte_always_inline void
 rte_atomic_thread_fence(int memory_order)
 {
diff --git a/lib/librte_eal/x86/include/rte_atomic.h b/lib/librte_eal/x86/include/rte_atomic.h
index 62ea393..b7d6b06 100644
--- a/lib/librte_eal/x86/include/rte_atomic.h
+++ b/lib/librte_eal/x86/include/rte_atomic.h
@@ -79,10 +79,6 @@ rte_smp_mb(void)
 
 #define rte_io_rmb() rte_compiler_barrier()
 
-#define rte_cio_wmb() rte_compiler_barrier()
-
-#define rte_cio_rmb() rte_compiler_barrier()
-
 /**
  * Synchronization fence between threads based on the specified memory order.
  *
-- 
2.7.4

