[PATCH 2/2] examples/l3fwd-power: add PM QoS request configuration

[Huisong Li]

Add PM QoS request configuration to declease the process resume latency.

Signed-off-by: Huisong Li <lihuis...@huawei.com>
---
 examples/l3fwd-power/main.c | 41 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index f4adcf41b5..78f292ed02 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -47,6 +47,7 @@
 #include <rte_telemetry.h>
 #include <rte_power_pmd_mgmt.h>
 #include <rte_power_uncore.h>
+#include <rte_power_qos.h>
 
 #include "perf_core.h"
 #include "main.h"
@@ -2232,12 +2233,48 @@ static int check_ptype(uint16_t portid)
 
 }
 
+static int
+pm_qos_init(void)
+{
+       int cur_cpu_latency;
+       int ret;
+
+       ret = rte_power_qos_get_curr_cpu_latency(&cur_cpu_latency);
+       if (ret < 0) {
+               RTE_LOG(ERR, L3FWD_POWER, "failed to get current cpu 
latency.\n");
+               return ret;
+       }
+       RTE_LOG(INFO, L3FWD_POWER, "current cpu latency is %dus on system.\n",
+                       (cur_cpu_latency / QOS_USEC_PER_SEC));
+
+       ret = rte_power_create_qos_request();
+       if (ret < 0) {
+               RTE_LOG(ERR, L3FWD_POWER, "Failed to create power QoS 
request.\n");
+               return ret;
+       }
+
+       /*
+        * Set strict latency requirement to prevent service thread going into
+        * a deeper sleep state whose resume time is longer.
+        */
+       ret = rte_power_qos_update_request(PM_QOS_STRICT_LATENCY_VALUE);
+       if (ret < 0)
+               RTE_LOG(ERR, L3FWD_POWER, "Failed to change cpu latency to 
0.\n");
+       return ret;
+}
+
 static int
 init_power_library(void)
 {
        enum power_management_env env;
        unsigned int lcore_id;
-       int ret = 0;
+       int ret;
+
+       ret = pm_qos_init();
+       if (ret != 0) {
+               RTE_LOG(ERR, L3FWD_POWER, "init power Qos failed.\n");
+               return ret;
+       }
 
        RTE_LCORE_FOREACH(lcore_id) {
                /* init power management library */
@@ -2268,6 +2305,8 @@ deinit_power_library(void)
        unsigned int lcore_id, max_pkg, max_die, die, pkg;
        int ret = 0;
 
+       rte_power_release_qos_request();
+
        RTE_LCORE_FOREACH(lcore_id) {
                /* deinit power management library */
                ret = rte_power_exit(lcore_id);
-- 
2.22.0