[PATCH] examples/l3fwd-power: fix to configure the uncore env

[Sivaprasad Tummala <sivaprasad.tummala@amd.com>]

Updated the l3fwd-power app to configure the uncore env before invoking
any uncore APIs. With auto-detection in 'rte_power_uncore_init()' it is
too late because other APIs already called.

Bugzilla ID: 1304
Fixes: ac1edcb6621a ("power: refactor uncore power management API")
Cc: karen.kelly@intel.com

Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala@amd.com>
---
 examples/l3fwd-power/main.c  | 6 ++++++
 lib/power/rte_power_uncore.c | 7 +++++++
 lib/power/rte_power_uncore.h | 9 +++++----
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index 5fbc16bb2a..9c0dcd343b 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -1561,6 +1561,12 @@ parse_uncore_options(enum uncore_choice choice, const char *argument)
 {
 	unsigned int die, pkg, max_pkg, max_die;
 	int ret = 0;
+	ret = rte_power_set_uncore_env(RTE_UNCORE_PM_ENV_AUTO_DETECT);
+	if (ret < 0) {
+		RTE_LOG(INFO, L3FWD_POWER, "Failed to set uncore env\n");
+		return ret;
+	}
+
 	max_pkg = rte_power_uncore_get_num_pkgs();
 	if (max_pkg == 0)
 		return -1;
diff --git a/lib/power/rte_power_uncore.c b/lib/power/rte_power_uncore.c
index 78a823d34c..d87328bedf 100644
--- a/lib/power/rte_power_uncore.c
+++ b/lib/power/rte_power_uncore.c
@@ -105,6 +105,13 @@ rte_power_set_uncore_env(enum rte_uncore_power_mgmt_env env)
 		return -1;
 	}
 
+	if (env == RTE_UNCORE_PM_ENV_AUTO_DETECT)
+		/* Currently only intel_uncore is supported. This will be
+		 * extended with auto-detection support for multiple uncore
+		 * implementations.
+		 */
+		env = RTE_UNCORE_PM_ENV_INTEL_UNCORE;
+
 	ret = 0;
 	if (env == RTE_UNCORE_PM_ENV_INTEL_UNCORE) {
 		rte_power_get_uncore_freq = power_get_intel_uncore_freq;
diff --git a/lib/power/rte_power_uncore.h b/lib/power/rte_power_uncore.h
index 295017b7f4..ede50a5f87 100644
--- a/lib/power/rte_power_uncore.h
+++ b/lib/power/rte_power_uncore.h
@@ -21,15 +21,16 @@ extern "C" {
 /* Uncore Power Management Environment */
 enum rte_uncore_power_mgmt_env {
 	RTE_UNCORE_PM_ENV_NOT_SET,
+	RTE_UNCORE_PM_ENV_AUTO_DETECT,
 	RTE_UNCORE_PM_ENV_INTEL_UNCORE,
 	RTE_UNCORE_PM_ENV_AMD_HSMP
 };
 
 /**
- * Set the default uncore power management implementation. If this is not called prior
- * to rte_power_uncore_init(), then auto-detect of the environment will take place.
- * It is thread safe. New env can be set only in uninitialized state
- * (thus rte_power_unset_uncore_env must be called if different env was already set).
+ * Set the default uncore power management implementation. This has to be called
+ * prior to calling any other rte_power_uncore_*() API.
+ * It is thread safe. New env can be set only in uninitialized state.
+ * rte_power_unset_uncore_env must be called if different env was already set).
  *
  * @param env
  *  env. The environment in which to initialise Uncore Power Management for.
-- 
2.34.1