From b2d5bfd0d192cca1e7db67a1b7e85e7202db3c8e Mon Sep 17 00:00:00 2001
From: Vitaliy Mysak <vitaliy.mysak@intel.com>
Date: Fri, 7 Dec 2018 19:04:03 +0000
Subject: [PATCH] OCF: use rte_pause in wait loop

Add rte_pause to waiting while loop
This commit also adds spdk_pause as interface for rte_pause

Change-Id: I56e1023731e2e78febaa4f45808d6f07656d290f
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/436494
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
---
 include/spdk/env.h         | 5 +++++
 lib/bdev/ocf/env/ocf_env.c | 4 +++-
 lib/env_dpdk/env.c         | 5 +++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/spdk/env.h b/include/spdk/env.h
index 5af2182cb..2d2c7faa5 100644
--- a/include/spdk/env.h
+++ b/include/spdk/env.h
@@ -510,6 +510,11 @@ uint64_t spdk_get_ticks_hz(void);
  */
 void spdk_delay_us(unsigned int us);
 
+/**
+ * Pause CPU execution for a short while
+ */
+void spdk_pause(void);
+
 struct spdk_ring;
 
 enum spdk_ring_type {
diff --git a/lib/bdev/ocf/env/ocf_env.c b/lib/bdev/ocf/env/ocf_env.c
index c7b56c0d1..6fa9589d0 100644
--- a/lib/bdev/ocf/env/ocf_env.c
+++ b/lib/bdev/ocf/env/ocf_env.c
@@ -101,7 +101,9 @@ env_completion_init(env_completion *completion)
 void
 env_completion_wait(env_completion *completion)
 {
-	while (atomic_read(&completion->atom));
+	while (atomic_read(&completion->atom)) {
+		spdk_pause();
+	}
 }
 
 void
diff --git a/lib/env_dpdk/env.c b/lib/env_dpdk/env.c
index 2b6b03d49..13337f52a 100644
--- a/lib/env_dpdk/env.c
+++ b/lib/env_dpdk/env.c
@@ -307,6 +307,11 @@ void spdk_delay_us(unsigned int us)
 	rte_delay_us(us);
 }
 
+void spdk_pause(void)
+{
+	rte_pause();
+}
+
 void
 spdk_unaffinitize_thread(void)
 {