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From: Kajol Jain <kjain@linux.ibm.com>
To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
	nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org,
	peterz@infradead.org
Cc: maddy@linux.vnet.ibm.com, santosh@fossix.org,
	aneesh.kumar@linux.ibm.com, vaibhav@linux.ibm.com,
	dan.j.williams@intel.com, ira.weiny@intel.com,
	atrajeev@linux.vnet.ibm.com, tglx@linutronix.de,
	kjain@linux.ibm.com, rnsastry@linux.ibm.com
Subject: [PATCH v2 1/4] drivers/nvdimm: Add nvdimm pmu structure
Date: Mon, 14 Jun 2021 10:53:23 +0530	[thread overview]
Message-ID: <20210614052326.285710-2-kjain@linux.ibm.com> (raw)
In-Reply-To: <20210614052326.285710-1-kjain@linux.ibm.com>

A structure is added, called nvdimm_pmu, for performance
stats reporting support of nvdimm devices. It can be used to add
nvdimm pmu data such as supported events and pmu event functions
like event_init/add/read/del with cpu hotplug support.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 include/linux/nd.h | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/include/linux/nd.h b/include/linux/nd.h
index ee9ad76afbba..712499cf7335 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -8,6 +8,8 @@
 #include <linux/ndctl.h>
 #include <linux/device.h>
 #include <linux/badblocks.h>
+#include <linux/platform_device.h>
+#include <linux/perf_event.h>
 
 enum nvdimm_event {
 	NVDIMM_REVALIDATE_POISON,
@@ -23,6 +25,47 @@ enum nvdimm_claim_class {
 	NVDIMM_CCLASS_UNKNOWN,
 };
 
+/* Event attribute array index */
+#define NVDIMM_PMU_FORMAT_ATTR		0
+#define NVDIMM_PMU_EVENT_ATTR		1
+#define NVDIMM_PMU_CPUMASK_ATTR		2
+#define NVDIMM_PMU_NULL_ATTR		3
+
+/**
+ * struct nvdimm_pmu - data structure for nvdimm perf driver
+ *
+ * @name: name of the nvdimm pmu device.
+ * @pmu: pmu data structure for nvdimm performance stats.
+ * @dev: nvdimm device pointer.
+ * @functions(event_init/add/del/read): platform specific pmu functions.
+ * @attr_groups: data structure for events, formats and cpumask
+ * @cpu: designated cpu for counter access.
+ * @node: node for cpu hotplug notifier link.
+ * @cpuhp_state: state for cpu hotplug notification.
+ * @arch_cpumask: cpumask to get designated cpu for counter access.
+ */
+struct nvdimm_pmu {
+	const char *name;
+	struct pmu pmu;
+	struct device *dev;
+	int (*event_init)(struct perf_event *event);
+	int  (*add)(struct perf_event *event, int flags);
+	void (*del)(struct perf_event *event, int flags);
+	void (*read)(struct perf_event *event);
+	/*
+	 * Attribute groups for the nvdimm pmu. Index 0 used for
+	 * format attribute, index 1 used for event attribute,
+	 * index 2 used for cpusmask attribute and index 3 kept as NULL.
+	 */
+	const struct attribute_group *attr_groups[4];
+	int cpu;
+	struct hlist_node node;
+	enum cpuhp_state cpuhp_state;
+
+	/* cpumask provided by arch/platform specific code */
+	struct cpumask arch_cpumask;
+};
+
 struct nd_device_driver {
 	struct device_driver drv;
 	unsigned long type;
-- 
2.27.0


  reply	other threads:[~2021-06-14  5:24 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14  5:23 [PATCH v2 0/4] Add perf interface to expose nvdimm Kajol Jain
2021-06-14  5:23 ` Kajol Jain [this message]
2021-06-14  5:23 ` [PATCH v2 2/4] drivers/nvdimm: Add perf interface to expose nvdimm performance stats Kajol Jain
2021-06-14  5:23 ` [PATCH v2 3/4] powerpc/papr_scm: Add perf interface support Kajol Jain
2021-06-14  5:23 ` [PATCH v2 4/4] powerpc/papr_scm: Document papr_scm sysfs event format entries Kajol Jain
2021-06-16 10:55 ` [PATCH v2 0/4] Add perf interface to expose nvdimm Nageswara Sastry
2021-06-17  6:32   ` kajoljain

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