netdev - [PATCH v3 03/13] task_isolation: add instruction synchronization memory barrier

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Date:   Thu, 9 Apr 2020 15:17:40 +0000
From:   Alex Belits <abelits@...vell.com>
To:     "frederic@...nel.org" <frederic@...nel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>
CC:     Prasun Kapoor <pkapoor@...vell.com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "will@...nel.org" <will@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH v3 03/13] task_isolation: add instruction synchronization
 memory barrier

Some architectures implement memory synchronization instructions for instruction cache. Make a separate kind of barrier that calls them.

Signed-off-by: Alex Belits <abelits@...vell.com>
---
 arch/arm/include/asm/barrier.h   | 2 ++
 arch/arm64/include/asm/barrier.h | 2 ++
 include/asm-generic/barrier.h    | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h
index 83ae97c049d9..6def62c95937 100644
--- a/arch/arm/include/asm/barrier.h
+++ b/arch/arm/include/asm/barrier.h
@@ -64,12 +64,14 @@ extern void arm_heavy_mb(void);
 #define mb()		__arm_heavy_mb()
 #define rmb()		dsb()
 #define wmb()		__arm_heavy_mb(st)
+#define imb()		isb()
 #define dma_rmb()	dmb(osh)
 #define dma_wmb()	dmb(oshst)
 #else
 #define mb()		barrier()
 #define rmb()		barrier()
 #define wmb()		barrier()
+#define imb()		barrier()
 #define dma_rmb()	barrier()
 #define dma_wmb()	barrier()
 #endif
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 7d9cc5ec4971..12a7dbd68bed 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -45,6 +45,8 @@
 #define rmb()		dsb(ld)
 #define wmb()		dsb(st)
 
+#define imb()		isb()
+
 #define dma_rmb()	dmb(oshld)
 #define dma_wmb()	dmb(oshst)
 
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index 85b28eb80b11..d5a822fb3e92 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -46,6 +46,10 @@
 #define dma_wmb()	wmb()
 #endif
 
+#ifndef imb
+#define imb		barrier()
+#endif
+
 #ifndef read_barrier_depends
 #define read_barrier_depends()		do { } while (0)
 #endif
-- 
2.20.1