linux-kernel - [PATCH v8 08/10] powerpc/powernv: Thread IMC events detection

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Message-Id: <1493907596-11425-9-git-send-email-anju@linux.vnet.ibm.com>
Date:   Thu,  4 May 2017 19:49:54 +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 v8 08/10] powerpc/powernv: Thread IMC events detection

Patch adds support for detection of thread IMC events. It adds a new
domain IMC_DOMAIN_THREAD and it is determined with the help of the
compatibility string "ibm,imc-counters-thread" based on 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        |  2 ++
 arch/powerpc/perf/imc-pmu.c               |  1 +
 arch/powerpc/platforms/powernv/opal-imc.c | 18 +++++++++++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
index bf5fb7c..6260e61 100644
--- a/arch/powerpc/include/asm/imc-pmu.h
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -49,6 +49,7 @@
 #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"
+#define IMC_DTB_THREAD_COMPAT		"ibm,imc-counters-thread"
 
 /*
  * Structure to hold per chip specific memory address
@@ -98,6 +99,7 @@ struct imc_pmu {
  */
 #define IMC_DOMAIN_NEST		1
 #define IMC_DOMAIN_CORE		2
+#define IMC_DOMAIN_THREAD	3
 #define IMC_DOMAIN_UNKNOWN	-1
 
 #define IMC_COUNTER_ENABLE	1
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index fb71825..9767714 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -41,6 +41,7 @@ struct imc_pmu *core_imc_pmu;
 /* Needed for sanity check */
 extern u64 nest_max_offset;
 extern u64 core_max_offset;
+extern u64 thread_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 23507d7..940f6b9 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -35,6 +35,7 @@
 
 u64 nest_max_offset;
 u64 core_max_offset;
+u64 thread_max_offset;
 
 static int imc_event_prop_update(char *name, struct imc_events *events)
 {
@@ -119,6 +120,10 @@ static void update_max_value(u32 value, int pmu_domain)
 		if (core_max_offset < value)
 			core_max_offset = value;
 		break;
+	case IMC_DOMAIN_THREAD:
+		if (thread_max_offset < value)
+			thread_max_offset = value;
+		break;
 	default:
 		/* Unknown domain, return */
 		return;
@@ -362,7 +367,7 @@ static struct imc_events *imc_events_setup(struct device_node *parent,
 /*
  * imc_pmu_create : Takes the parent device which is the pmu unit and a
  *                  pmu_index as the inputs.
- * Allocates memory for the pmu, sets up its domain (NEST/CORE), and
+ * Allocates memory for the pmu, sets up its domain (NEST/CORE/THREAD), and
  * calls imc_events_setup() to allocate memory for the events supported
  * by this pmu. Assigns a name for the pmu. Calls imc_events_node_parser()
  * to setup the individual events.
@@ -483,6 +488,17 @@ static void __init imc_pmu_setup(struct device_node *parent)
 			return;
 		pmu_count++;
 	}
+	/*
+	 * Loop through the imc-counters tree for each compatible
+	 * "ibm,imc-counters-thread", and update "struct imc_pmu".
+	 */
+	for_each_compatible_node(child, NULL, IMC_DTB_THREAD_COMPAT) {
+		domain = IMC_DOMAIN_THREAD;
+		rc = imc_pmu_create(child, pmu_count, domain);
+		if (rc)
+			return;
+		pmu_count++;
+	}
 }
 
 static int opal_imc_counters_probe(struct platform_device *pdev)
-- 
2.7.4