linux-kernel - [PATCH v11 06/10] powerpc/powernv: Core IMC events detection

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Date:   Thu, 29 Jun 2017 00:27:10 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        ego@...ux.vnet.ibm.com, bsingharora@...il.com, anton@...ba.org,
        sukadev@...ux.vnet.ibm.com, mikey@...ling.org,
        stewart@...ux.vnet.ibm.com, dja@...ens.net, eranian@...gle.com,
        hemant@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com,
        anju@...ux.vnet.ibm.com
Subject: [PATCH v11 06/10] powerpc/powernv: Core IMC events detection

From: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>

This patch adds support for detection of core IMC events along with the
Nest IMC events. It adds a new domain IMC_DOMAIN_CORE and its determined
with the help of the "type" property in the IMC device tree.

Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 arch/powerpc/include/asm/imc-pmu.h        |  3 +++
 arch/powerpc/perf/imc-pmu.c               |  2 ++
 arch/powerpc/platforms/powernv/opal-imc.c | 14 +++++++++++---
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
index 650c1e8..e9da151 100644
--- a/arch/powerpc/include/asm/imc-pmu.h
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -97,6 +97,7 @@ struct imc_pmu {
 
 /* In-Memory Collection Counters Type */
 enum {
+	IMC_COUNTER_PER_CORE		= 0x4,
 	IMC_COUNTER_PER_CHIP            = 0x10,
 };
 
@@ -104,7 +105,9 @@ enum {
  * Domains for IMC PMUs
  */
 #define IMC_DOMAIN_NEST		1
+#define IMC_DOMAIN_CORE		2
 
 extern struct imc_pmu *per_nest_pmu_arr[IMC_MAX_PMUS];
+extern struct imc_pmu *core_imc_pmu;
 extern int init_imc_pmu(struct imc_events *events, int idx, struct imc_pmu *pmu_ptr);
 #endif /* PPC_POWERNV_IMC_PMU_DEF_H */
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index b0bcb77..f4856eb 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -31,6 +31,8 @@ static DEFINE_MUTEX(imc_nest_inited_reserve);
 static DEFINE_MUTEX(imc_nest_reserve);
 
 
+struct imc_pmu *core_imc_pmu;
+
 struct imc_pmu *imc_event_to_pmu(struct perf_event *event)
 {
 	return container_of(event->pmu, struct imc_pmu, pmu);
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index a970ed3..98e7b0f5 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -379,7 +379,7 @@ static int imc_get_mem_addr_nest(struct device_node *node,
 /*
  * imc_pmu_create : Takes the parent device which is the pmu unit, pmu_index
  *		    and domain as the inputs.
- * Allocates memory for the pmu, sets up its domain (NEST), and
+ * Allocates memory for the pmu, sets up its domain (NEST/CORE), and
  * calls imc_events_setup() to allocate memory for the events supported
  * by this pmu. Assigns a name for the pmu.
  *
@@ -406,7 +406,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
 	pmu_ptr->domain = domain;
 
 	/* Needed for hotplug/migration */
-	per_nest_pmu_arr[pmu_index] = pmu_ptr;
+	if (pmu_ptr->domain == IMC_DOMAIN_CORE)
+		core_imc_pmu = pmu_ptr;
+	else if (pmu_ptr->domain == IMC_DOMAIN_NEST)
+		per_nest_pmu_arr[pmu_index] = pmu_ptr;
 
 	pp = of_find_property(parent, "name", NULL);
 	if (!pp) {
@@ -427,7 +430,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
 		goto free_pmu;
 	}
 	/* Save the name to register it later */
-	sprintf(buf, "nest_%s", (char *)pp->value);
+	if (pmu_ptr->domain == IMC_DOMAIN_NEST)
+		sprintf(buf, "nest_%s", (char *)pp->value);
+	else
+		sprintf(buf, "%s_imc", (char *)pp->value);
 	pmu_ptr->pmu.name = (char *)buf;
 
 	if (of_property_read_u32(parent, "size", &pmu_ptr->counter_mem_size))
@@ -504,6 +510,8 @@ static int opal_imc_counters_probe(struct platform_device *pdev)
 			continue;
 		if (type == IMC_COUNTER_PER_CHIP)
 			domain = IMC_DOMAIN_NEST;
+		else if (type == IMC_COUNTER_PER_CORE)
+			domain = IMC_DOMAIN_CORE;
 		else
 			continue;
 		if (!imc_pmu_create(imc_dev, pmu_count, domain))
-- 
2.7.4