linux-kernel - [PATCH v4 07/10] powerpc/powernv: Core IMC events detection

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Date:   Mon, 20 Feb 2017 08:39:24 +0530
From:   Hemant Kumar <hemant@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org,
        Hemant Kumar <hemant@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Anton Blanchard <anton@...ba.org>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Michael Neuling <mikey@...ling.org>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Stephane Eranian <eranian@...gle.com>,
        Balbir Singh <bsingharora@...il.com>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Subject: [PATCH v4 07/10] powerpc/powernv: Core IMC events detection

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 compatibility string "ibm,imc-counters-core" based
on the IMC device tree.

Cc: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Anton Blanchard <anton@...ba.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Michael Neuling <mikey@...ling.org>
Cc: Stewart Smith <stewart@...ux.vnet.ibm.com>
Cc: Daniel Axtens <dja@...ens.net>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Balbir Singh <bsingharora@...il.com>
Cc: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
---
 arch/powerpc/include/asm/imc-pmu.h        |  2 ++
 arch/powerpc/perf/imc-pmu.c               |  3 +++
 arch/powerpc/platforms/powernv/opal-imc.c | 18 ++++++++++++++++--
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
index 7b58721..59de083 100644
--- a/arch/powerpc/include/asm/imc-pmu.h
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -30,6 +30,7 @@
 
 #define IMC_DTB_COMPAT		"ibm,opal-in-memory-counters"
 #define IMC_DTB_NEST_COMPAT	"ibm,imc-counters-nest"
+#define IMC_DTB_CORE_COMPAT	"ibm,imc-counters-core"
 
 /*
  * Structure to hold per chip specific memory address
@@ -67,6 +68,7 @@ struct imc_pmu {
  * Domains for IMC PMUs
  */
 #define IMC_DOMAIN_NEST		1
+#define IMC_DOMAIN_CORE		2
 
 #define UNKNOWN_DOMAIN		-1
 
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index e46ff6d..9a0e3bc 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -18,8 +18,11 @@ struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
 struct imc_pmu *per_nest_pmu_arr[IMC_MAX_PMUS];
 static cpumask_t nest_imc_cpumask;
 
+struct imc_pmu *core_imc_pmu;
+
 /* Needed for sanity check */
 extern u64 nest_max_offset;
+extern u64 core_max_offset;
 
 PMU_FORMAT_ATTR(event, "config:0-20");
 static struct attribute *imc_format_attrs[] = {
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index a65aa2d..67ce873 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -33,10 +33,12 @@
 
 extern struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
 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);
 u64 nest_max_offset;
+u64 core_max_offset;
 
 static int imc_event_info(char *name, struct imc_events *events)
 {
@@ -80,6 +82,10 @@ static void update_max_value(u32 value, int pmu_domain)
 		if (nest_max_offset < value)
 			nest_max_offset = value;
 		break;
+	case IMC_DOMAIN_CORE:
+		if (core_max_offset < value)
+			core_max_offset = value;
+		break;
 	default:
 		/* Unknown domain, return */
 		return;
@@ -231,6 +237,8 @@ int imc_get_domain(struct device_node *pmu_dev)
 {
 	if (of_device_is_compatible(pmu_dev, IMC_DTB_NEST_COMPAT))
 		return IMC_DOMAIN_NEST;
+	if (of_device_is_compatible(pmu_dev, IMC_DTB_CORE_COMPAT))
+		return IMC_DOMAIN_CORE;
 	else
 		return UNKNOWN_DOMAIN;
 }
@@ -298,7 +306,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index)
 		goto free_pmu;
 
 	/* 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;
 
 	/*
 	 * "events" property inside a PMU node contains the phandle value
@@ -354,7 +365,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index)
 	}
 
 	/* 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;
 
 	/*
-- 
2.7.4