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Date:	Thu, 11 Jun 2015 10:47:53 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	rusty@...tcorp.com.au,
	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>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v2 6/7]powerpc/powernv: generic nest pmu event functions

Add generic format attribute and set of generic nest pmu related
event functions to be used by each nest pmu. Add code to register nest pmus.

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: 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 | 109 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c
index 8fad2d9..a662c14 100644
--- a/arch/powerpc/perf/nest-pmu.c
+++ b/arch/powerpc/perf/nest-pmu.c
@@ -13,6 +13,108 @@
 static struct perchip_nest_info p8_perchip_nest_info[P8_MAX_CHIP];
 static struct nest_pmu *per_nest_pmu_arr[P8_MAX_NEST_PMUS];
 
+PMU_FORMAT_ATTR(event, "config:0-20");
+struct attribute *p8_nest_format_attrs[] = {
+	&format_attr_event.attr,
+	NULL,
+};
+
+struct attribute_group p8_nest_format_group = {
+	.name = "format",
+	.attrs = p8_nest_format_attrs,
+};
+
+static int p8_nest_event_init(struct perf_event *event)
+{
+	int chip_id;
+
+	if (event->attr.type != event->pmu->type)
+		return -ENOENT;
+
+	/* Sampling not supported yet */
+	if (event->hw.sample_period)
+		return -EINVAL;
+
+	/* unsupported modes and filters */
+	if (event->attr.exclude_user   ||
+	    event->attr.exclude_kernel ||
+	    event->attr.exclude_hv     ||
+	    event->attr.exclude_idle   ||
+	    event->attr.exclude_host   ||
+	    event->attr.exclude_guest)
+		return -EINVAL;
+
+	if (event->cpu < 0)
+		return -EINVAL;
+
+	chip_id = topology_physical_package_id(event->cpu);
+	event->hw.event_base = event->attr.config +
+				p8_perchip_nest_info[chip_id].vbase;
+
+	return 0;
+}
+
+static void p8_nest_read_counter(struct perf_event *event)
+{
+	u64 *addr;
+	u64 data = 0;
+
+	addr = (u64 *)event->hw.event_base;
+	data = __be64_to_cpu((uint64_t)*addr);
+	local64_set(&event->hw.prev_count, data);
+}
+
+static void p8_nest_perf_event_update(struct perf_event *event)
+{
+	u64 counter_prev, counter_new, final_count;
+	uint64_t *addr;
+
+	addr = (u64 *)event->hw.event_base;
+	counter_prev = local64_read(&event->hw.prev_count);
+	counter_new = __be64_to_cpu((uint64_t)*addr);
+	final_count = counter_new - counter_prev;
+
+	local64_set(&event->hw.prev_count, counter_new);
+	local64_add(final_count, &event->count);
+}
+
+static void p8_nest_event_start(struct perf_event *event, int flags)
+{
+	event->hw.state = 0;
+	p8_nest_read_counter(event);
+}
+
+static void p8_nest_event_stop(struct perf_event *event, int flags)
+{
+	p8_nest_perf_event_update(event);
+}
+
+static int p8_nest_event_add(struct perf_event *event, int flags)
+{
+	p8_nest_event_start(event, flags);
+	return 0;
+}
+
+/*
+ * Populate pmu ops in the structure
+ */
+static int update_pmu_ops(struct nest_pmu *pmu)
+{
+	if (!pmu)
+		return -EINVAL;
+
+	pmu->pmu.task_ctx_nr = perf_invalid_context;
+	pmu->pmu.event_init = p8_nest_event_init;
+	pmu->pmu.add = p8_nest_event_add;
+	pmu->pmu.del = p8_nest_event_stop;
+	pmu->pmu.start = p8_nest_event_start;
+	pmu->pmu.stop = p8_nest_event_stop;
+	pmu->pmu.read = p8_nest_perf_event_update;
+	pmu->pmu.attr_groups = pmu->attr_groups;
+
+	return 0;
+}
+
 /*
  * Populate event name and string in attribute
  */
@@ -106,6 +208,7 @@ static int nest_pmu_create(struct device_node *dev, int pmu_index)
 			/* Save the name to register the PMU with it */
 			sprintf(buf, "Nest_%s", (char *)pp->value);
 			pmu_ptr->pmu.name = (char *)buf;
+			pmu_ptr->attr_groups[1] = &p8_nest_format_group;
 		}
 
 		/* Skip these, we dont need it */
@@ -179,6 +282,12 @@ static int nest_pmu_create(struct device_node *dev, int pmu_index)
 		(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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