linux-kernel - [PATCH v1 7/9]powerpc/powernv: Event attr creation and PMU registration

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Date:	Tue,  2 Jun 2015 21:29:36 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v1 7/9]powerpc/powernv: Event attr creation and PMU registration

Patch adds common event attribute function and Nest pmu registration call.

Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 arch/powerpc/perf/nest-pmu.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c
index 514a0be..dd84fd7 100644
--- a/arch/powerpc/perf/nest-pmu.c
+++ b/arch/powerpc/perf/nest-pmu.c
@@ -244,6 +244,49 @@ static int update_pmu_ops(struct nest_pmu *pmu)
 	return 0;
 }
 
+/*
+ * Populate event name and string in attribute
+ */
+struct attribute *dev_str_attr(char *name, char *str)
+{
+	struct perf_pmu_events_attr *attr;
+
+	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+
+	attr->event_str = (const char *)str;
+	attr->attr.attr.name = name;
+	attr->attr.attr.mode = 0444;
+	attr->attr.show = perf_event_sysfs_show;
+
+	return &attr->attr.attr;
+}
+
+int update_events_in_group(
+	struct ppc64_nest_ima_events *p8_events, int idx,
+		struct nest_pmu *pmu)
+{
+	struct attribute_group *attr_group;
+	struct attribute **attrs;
+	int i;
+
+	attr_group = kzalloc(((sizeof(struct attribute *) * (idx + 1)) +
+				sizeof(*attr_group)), GFP_KERNEL);
+	if (!attr_group)
+		return -ENOMEM;
+
+	attrs = (struct attribute **)(attr_group + 1);
+	attr_group->name = "events";
+	attr_group->attrs = attrs;
+
+	for (i=0; i< idx; i++, p8_events++)
+		attrs[i] = dev_str_attr((char *)p8_events->ev_name,
+						(char *)p8_events->ev_value);
+
+	pmu->attr_groups[0] = attr_group;
+	return 0;
+}
+
+
 static int nest_pmu_create(struct device_node *dev, int pmu_index)
 {
 	struct ppc64_nest_ima_events **p8_events_arr;
@@ -364,6 +407,15 @@ static int nest_pmu_create(struct device_node *dev, int pmu_index)
 		}
 	}
 
+	update_events_in_group(
+		(struct ppc64_nest_ima_events *)p8_events_arr,
+							idx, pmu_ptr);
+	update_pmu_ops(pmu_ptr);
+
+	/* Register the pmu */
+	perf_pmu_register(&pmu_ptr->pmu, pmu_ptr->pmu.name, -1);
+	printk(KERN_INFO "Nest PMU %s Registered\n", pmu_ptr->pmu.name);
+
 	return 0;
 }
 
-- 
1.9.1

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