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barrier.h: add spdk_rmb

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These are needed in some cases on x86 where a compiler
barrier is not sufficient - for example, ensuring an
rdtsc instruction has executed before subsequent
instructions.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I339e2dd6138ccb11b1492e70f7c724976ef3038b

Reviewed-on: https://review.gerrithub.io/413145
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Jim Harris 2018-05-31 06:02:45 -07:00 committed by Daniel Verkamp
parent fafec18e3c
commit 39abf01ee2
1 changed files with 12 additions and 0 deletions
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12
include/spdk/barrier.h
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@ -60,6 +60,18 @@ extern "C" {
#error Unknown architecture
#endif
/** Read memory barrier */
#ifdef __PPC64__
#define spdk_rmb() __asm volatile("lwsync" ::: "memory")
#elif defined(__aarch64__)
#define spdk_rmb() __asm volatile("dsb lt" ::: "memory")
#elif defined(__i386__) || defined(__x86_64__)
#define spdk_rmb() __asm volatile("lfence" ::: "memory")
#else
#define spdk_rmb()
#error Unknown architecture
#endif
/** Full read/write memory barrier */
#ifdef __PPC64__
#define spdk_mb() __asm volatile("sync" ::: "memory")