linux-kernel - [PATCH v13 1/5] powerpc/platform/powernv: Update IMC OPAL APIs

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Date:   Wed, 19 Jul 2017 03:06:32 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Hemant Kumar <hemant@...ux.vnet.ibm.com>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Subject: [PATCH v13 1/5] powerpc/platform/powernv: Update IMC OPAL APIs

In-Memory Collection (IMC) counters are performance monitoring infrastrcuture.
These counters need special sequence of scoms to init/start/stop which is handled
by OPAL. And OPAL provides three APIs to init and control these IMC engines.

OPAL API documentation:
  https://github.com/open-power/skiboot/blob/master/doc/opal-api/opal-imc-counters.rst

Patch updates the kernel side powernv platform code to support the new OPAL APIs

Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 arch/powerpc/include/asm/opal-api.h            | 11 ++++++++++-
 arch/powerpc/include/asm/opal.h                |  5 +++++
 arch/powerpc/platforms/powernv/opal-wrappers.S |  3 +++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 3130a73652c7..d568612ff188 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -190,7 +190,10 @@
 #define OPAL_NPU_INIT_CONTEXT			146
 #define OPAL_NPU_DESTROY_CONTEXT		147
 #define OPAL_NPU_MAP_LPAR			148
-#define OPAL_LAST				148
+#define OPAL_IMC_COUNTERS_INIT			149
+#define OPAL_IMC_COUNTERS_START			150
+#define OPAL_IMC_COUNTERS_STOP			151
+#define OPAL_LAST				151
 
 /* Device tree flags */
 
@@ -1084,6 +1087,12 @@ enum {
 	XIVE_DUMP_EMU_STATE	= 5,
 };
 
+/* "type" argument to OPAL_IMC_COUNTERS_* calls */
+enum {
+	OPAL_IMC_COUNTERS_NEST = 1,
+	OPAL_IMC_COUNTERS_CORE = 2,
+};
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __OPAL_API_H */
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 588fb1c23af9..6b8513c3ad40 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -268,6 +268,11 @@ int64_t opal_xive_free_irq(uint32_t girq);
 int64_t opal_xive_sync(uint32_t type, uint32_t id);
 int64_t opal_xive_dump(uint32_t type, uint32_t id);
 
+int64_t opal_imc_counters_init(uint32_t type, uint64_t address,
+							uint64_t cpu_pir);
+int64_t opal_imc_counters_start(uint32_t type, uint64_t cpu_pir);
+int64_t opal_imc_counters_stop(uint32_t type, uint64_t cpu_pir);
+
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
 				   int depth, void *data);
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index 4ca6c26a56d5..b77f52ee8263 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -310,3 +310,6 @@ OPAL_CALL(opal_xive_dump,			OPAL_XIVE_DUMP);
 OPAL_CALL(opal_npu_init_context,		OPAL_NPU_INIT_CONTEXT);
 OPAL_CALL(opal_npu_destroy_context,		OPAL_NPU_DESTROY_CONTEXT);
 OPAL_CALL(opal_npu_map_lpar,			OPAL_NPU_MAP_LPAR);
+OPAL_CALL(opal_imc_counters_init,		OPAL_IMC_COUNTERS_INIT);
+OPAL_CALL(opal_imc_counters_start,		OPAL_IMC_COUNTERS_START);
+OPAL_CALL(opal_imc_counters_stop,		OPAL_IMC_COUNTERS_STOP);
-- 
2.7.4