Date:	Wed,  9 Mar 2016 17:21:07 +0100
From:	Jan Glauber <jglauber@...ium.com>
To:	Mark Rutland <mark.rutland@....com>,
	Will Deacon <will.deacon@....com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Jan Glauber <jglauber@...ium.com>
Subject: [PATCH v2 5/5] arm64/perf: Cavium ThunderX OCX TLK uncore support

Support for the OCX transmit link counters.

Signed-off-by: Jan Glauber <jglauber@...ium.com>
---
 drivers/perf/uncore/Makefile                |   3 +-
 drivers/perf/uncore/uncore_cavium.c         |   3 +
 drivers/perf/uncore/uncore_cavium.h         |   4 +
 drivers/perf/uncore/uncore_cavium_ocx_tlk.c | 380 ++++++++++++++++++++++++++++
 4 files changed, 389 insertions(+), 1 deletion(-)
 create mode 100644 drivers/perf/uncore/uncore_cavium_ocx_tlk.c

diff --git a/drivers/perf/uncore/Makefile b/drivers/perf/uncore/Makefile
index 81479e8..88d1f57 100644
--- a/drivers/perf/uncore/Makefile
+++ b/drivers/perf/uncore/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_ARCH_THUNDER) += uncore_cavium.o		\
 			      uncore_cavium_l2c_tad.o	\
 			      uncore_cavium_l2c_cbc.o	\
-			      uncore_cavium_lmc.o
+			      uncore_cavium_lmc.o	\
+			      uncore_cavium_ocx_tlk.o
diff --git a/drivers/perf/uncore/uncore_cavium.c b/drivers/perf/uncore/uncore_cavium.c
index 45c81d0..e210457 100644
--- a/drivers/perf/uncore/uncore_cavium.c
+++ b/drivers/perf/uncore/uncore_cavium.c
@@ -21,6 +21,8 @@ struct thunder_uncore *event_to_thunder_uncore(struct perf_event *event)
 		return thunder_uncore_l2c_cbc;
 	else if (event->pmu->type == thunder_lmc_pmu.type)
 		return thunder_uncore_lmc;
+	else if (event->pmu->type == thunder_ocx_tlk_pmu.type)
+		return thunder_uncore_ocx_tlk;
 	else
 		return NULL;
 }
@@ -306,6 +308,7 @@ static int __init thunder_uncore_init(void)
 	thunder_uncore_l2c_tad_setup();
 	thunder_uncore_l2c_cbc_setup();
 	thunder_uncore_lmc_setup();
+	thunder_uncore_ocx_tlk_setup();
 	return 0;
 }
 late_initcall(thunder_uncore_init);
diff --git a/drivers/perf/uncore/uncore_cavium.h b/drivers/perf/uncore/uncore_cavium.h
index f14f6be..78e95c7 100644
--- a/drivers/perf/uncore/uncore_cavium.h
+++ b/drivers/perf/uncore/uncore_cavium.h
@@ -10,6 +10,7 @@ enum uncore_type {
 	L2C_TAD_TYPE,
 	L2C_CBC_TYPE,
 	LMC_TYPE,
+	OCX_TLK_TYPE,
 };
 
 extern int thunder_uncore_version;
@@ -70,9 +71,11 @@ extern struct device_attribute format_attr_node;
 extern struct thunder_uncore *thunder_uncore_l2c_tad;
 extern struct thunder_uncore *thunder_uncore_l2c_cbc;
 extern struct thunder_uncore *thunder_uncore_lmc;
+extern struct thunder_uncore *thunder_uncore_ocx_tlk;
 extern struct pmu thunder_l2c_tad_pmu;
 extern struct pmu thunder_l2c_cbc_pmu;
 extern struct pmu thunder_lmc_pmu;
+extern struct pmu thunder_ocx_tlk_pmu;
 
 /* Prototypes */
 struct thunder_uncore *event_to_thunder_uncore(struct perf_event *event);
@@ -89,3 +92,4 @@ ssize_t thunder_events_sysfs_show(struct device *dev,
 int thunder_uncore_l2c_tad_setup(void);
 int thunder_uncore_l2c_cbc_setup(void);
 int thunder_uncore_lmc_setup(void);
+int thunder_uncore_ocx_tlk_setup(void);
diff --git a/drivers/perf/uncore/uncore_cavium_ocx_tlk.c b/drivers/perf/uncore/uncore_cavium_ocx_tlk.c
new file mode 100644
index 0000000..02f1bc1
--- /dev/null
+++ b/drivers/perf/uncore/uncore_cavium_ocx_tlk.c
@@ -0,0 +1,380 @@
+/*
+ * Cavium Thunder uncore PMU support, OCX TLK counters.
+ *
+ * Copyright 2016 Cavium Inc.
+ * Author: Jan Glauber <jan.glauber@...ium.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/perf_event.h>
+
+#include "uncore_cavium.h"
+
+#ifndef PCI_DEVICE_ID_THUNDER_OCX
+#define PCI_DEVICE_ID_THUNDER_OCX		0xa013
+#endif
+
+#define OCX_TLK_NR_UNITS			3
+#define OCX_TLK_UNIT_OFFSET			0x2000
+#define OCX_TLK_CONTROL_OFFSET			0x10040
+#define OCX_TLK_COUNTER_OFFSET			0x10400
+
+#define OCX_TLK_STAT_DISABLE			0
+#define OCX_TLK_STAT_ENABLE			1
+
+/* OCX TLK event list */
+#define OCX_TLK_EVENT_STAT_IDLE_CNT		0x00
+#define OCX_TLK_EVENT_STAT_DATA_CNT		0x01
+#define OCX_TLK_EVENT_STAT_SYNC_CNT		0x02
+#define OCX_TLK_EVENT_STAT_RETRY_CNT		0x03
+#define OCX_TLK_EVENT_STAT_ERR_CNT		0x04
+
+#define OCX_TLK_EVENT_STAT_MAT0_CNT		0x08
+#define OCX_TLK_EVENT_STAT_MAT1_CNT		0x09
+#define OCX_TLK_EVENT_STAT_MAT2_CNT		0x0a
+#define OCX_TLK_EVENT_STAT_MAT3_CNT		0x0b
+
+#define OCX_TLK_EVENT_STAT_VC0_CMD		0x10
+#define OCX_TLK_EVENT_STAT_VC1_CMD		0x11
+#define OCX_TLK_EVENT_STAT_VC2_CMD		0x12
+#define OCX_TLK_EVENT_STAT_VC3_CMD		0x13
+#define OCX_TLK_EVENT_STAT_VC4_CMD		0x14
+#define OCX_TLK_EVENT_STAT_VC5_CMD		0x15
+
+#define OCX_TLK_EVENT_STAT_VC0_PKT		0x20
+#define OCX_TLK_EVENT_STAT_VC1_PKT		0x21
+#define OCX_TLK_EVENT_STAT_VC2_PKT		0x22
+#define OCX_TLK_EVENT_STAT_VC3_PKT		0x23
+#define OCX_TLK_EVENT_STAT_VC4_PKT		0x24
+#define OCX_TLK_EVENT_STAT_VC5_PKT		0x25
+#define OCX_TLK_EVENT_STAT_VC6_PKT		0x26
+#define OCX_TLK_EVENT_STAT_VC7_PKT		0x27
+#define OCX_TLK_EVENT_STAT_VC8_PKT		0x28
+#define OCX_TLK_EVENT_STAT_VC9_PKT		0x29
+#define OCX_TLK_EVENT_STAT_VC10_PKT		0x2a
+#define OCX_TLK_EVENT_STAT_VC11_PKT		0x2b
+#define OCX_TLK_EVENT_STAT_VC12_PKT		0x2c
+#define OCX_TLK_EVENT_STAT_VC13_PKT		0x2d
+
+#define OCX_TLK_EVENT_STAT_VC0_CON		0x30
+#define OCX_TLK_EVENT_STAT_VC1_CON		0x31
+#define OCX_TLK_EVENT_STAT_VC2_CON		0x32
+#define OCX_TLK_EVENT_STAT_VC3_CON		0x33
+#define OCX_TLK_EVENT_STAT_VC4_CON		0x34
+#define OCX_TLK_EVENT_STAT_VC5_CON		0x35
+#define OCX_TLK_EVENT_STAT_VC6_CON		0x36
+#define OCX_TLK_EVENT_STAT_VC7_CON		0x37
+#define OCX_TLK_EVENT_STAT_VC8_CON		0x38
+#define OCX_TLK_EVENT_STAT_VC9_CON		0x39
+#define OCX_TLK_EVENT_STAT_VC10_CON		0x3a
+#define OCX_TLK_EVENT_STAT_VC11_CON		0x3b
+#define OCX_TLK_EVENT_STAT_VC12_CON		0x3c
+#define OCX_TLK_EVENT_STAT_VC13_CON		0x3d
+
+#define OCX_TLK_MAX_COUNTER			OCX_TLK_EVENT_STAT_VC13_CON
+#define OCX_TLK_NR_COUNTERS			OCX_TLK_MAX_COUNTER
+
+struct thunder_uncore *thunder_uncore_ocx_tlk;
+
+/*
+ * The OCX devices have a single device per node, therefore picking the
+ * first device from the list is correct.
+ */
+static inline void __iomem *map_offset(struct thunder_uncore_node *node,
+				       unsigned long addr, int offset, int nr)
+{
+	struct thunder_uncore_unit *unit;
+
+	unit = list_first_entry(&node->unit_list, struct thunder_uncore_unit,
+				entry);
+	return (void __iomem *) (addr + unit->map + nr * offset);
+}
+
+static void __iomem *map_offset_ocx_tlk(struct thunder_uncore_node *node,
+					unsigned long addr, int nr)
+{
+	return (void __iomem *) map_offset(node, addr, nr,
+					   OCX_TLK_UNIT_OFFSET);
+}
+
+/*
+ * Summarize counters across all TLK's. Different from the other uncore
+ * PMUs because all TLK's are on one PCI device.
+ */
+static void thunder_uncore_read_ocx_tlk(struct perf_event *event)
+{
+	struct thunder_uncore *uncore = event_to_thunder_uncore(event);
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunder_uncore_node *node;
+	u64 prev, new = 0;
+	s64 delta;
+	int i;
+
+	/*
+	 * No counter overflow interrupts so we do not
+	 * have to worry about prev_count changing on us.
+	 */
+
+	prev = local64_read(&hwc->prev_count);
+
+	/* read counter values from all units */
+	node = get_node(hwc->config, uncore);
+	for (i = 0; i < OCX_TLK_NR_UNITS; i++)
+		new += readq(map_offset_ocx_tlk(node, hwc->event_base, i));
+
+	local64_set(&hwc->prev_count, new);
+	delta = new - prev;
+	local64_add(delta, &event->count);
+}
+
+static void thunder_uncore_start(struct perf_event *event, int flags)
+{
+	struct thunder_uncore *uncore = event_to_thunder_uncore(event);
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunder_uncore_node *node;
+	int i;
+
+	hwc->state = 0;
+
+	/* enable counters on all units */
+	node = get_node(hwc->config, uncore);
+	for (i = 0; i < OCX_TLK_NR_UNITS; i++)
+		writeb(OCX_TLK_STAT_ENABLE,
+		       map_offset_ocx_tlk(node, hwc->config_base, i));
+
+	perf_event_update_userpage(event);
+}
+
+static void thunder_uncore_stop(struct perf_event *event, int flags)
+{
+	struct thunder_uncore *uncore = event_to_thunder_uncore(event);
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunder_uncore_node *node;
+	int i;
+
+	/* disable counters on all units */
+	node = get_node(hwc->config, uncore);
+	for (i = 0; i < OCX_TLK_NR_UNITS; i++)
+		writeb(OCX_TLK_STAT_DISABLE,
+		       map_offset_ocx_tlk(node, hwc->config_base, i));
+	hwc->state |= PERF_HES_STOPPED;
+
+	if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
+		thunder_uncore_read_ocx_tlk(event);
+		hwc->state |= PERF_HES_UPTODATE;
+	}
+}
+
+static int thunder_uncore_add(struct perf_event *event, int flags)
+{
+	struct thunder_uncore *uncore = event_to_thunder_uncore(event);
+	struct hw_perf_event *hwc = &event->hw;
+	struct thunder_uncore_node *node;
+	int id, i;
+
+	WARN_ON_ONCE(!uncore);
+	node = get_node(hwc->config, uncore);
+	id = get_id(hwc->config);
+
+	/* are we already assigned? */
+	if (hwc->idx != -1 && node->events[hwc->idx] == event)
+		goto out;
+
+	for (i = 0; i < node->num_counters; i++) {
+		if (node->events[i] == event) {
+			hwc->idx = i;
+			goto out;
+		}
+	}
+
+	/* counters are 1:1 */
+	hwc->idx = -1;
+	if (cmpxchg(&node->events[id], NULL, event) == NULL)
+		hwc->idx = id;
+
+out:
+	if (hwc->idx == -1)
+		return -EBUSY;
+
+	hwc->config_base = 0;
+	hwc->event_base = OCX_TLK_COUNTER_OFFSET - OCX_TLK_CONTROL_OFFSET +
+			hwc->idx * sizeof(unsigned long long);
+	hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
+
+	if (flags & PERF_EF_START)
+		thunder_uncore_start(event, PERF_EF_RELOAD);
+	return 0;
+}
+
+PMU_FORMAT_ATTR(event, "config:0-5");
+
+static struct attribute *thunder_ocx_tlk_format_attr[] = {
+	&format_attr_event.attr,
+	&format_attr_node.attr,
+	NULL,
+};
+
+static struct attribute_group thunder_ocx_tlk_format_group = {
+	.name = "format",
+	.attrs = thunder_ocx_tlk_format_attr,
+};
+
+EVENT_ATTR(idle_cnt,	OCX_TLK_EVENT_STAT_IDLE_CNT);
+EVENT_ATTR(data_cnt,	OCX_TLK_EVENT_STAT_DATA_CNT);
+EVENT_ATTR(sync_cnt,	OCX_TLK_EVENT_STAT_SYNC_CNT);
+EVENT_ATTR(retry_cnt,	OCX_TLK_EVENT_STAT_RETRY_CNT);
+EVENT_ATTR(err_cnt,	OCX_TLK_EVENT_STAT_ERR_CNT);
+EVENT_ATTR(mat0_cnt,	OCX_TLK_EVENT_STAT_MAT0_CNT);
+EVENT_ATTR(mat1_cnt,	OCX_TLK_EVENT_STAT_MAT1_CNT);
+EVENT_ATTR(mat2_cnt,	OCX_TLK_EVENT_STAT_MAT2_CNT);
+EVENT_ATTR(mat3_cnt,	OCX_TLK_EVENT_STAT_MAT3_CNT);
+EVENT_ATTR(vc0_cmd,	OCX_TLK_EVENT_STAT_VC0_CMD);
+EVENT_ATTR(vc1_cmd,	OCX_TLK_EVENT_STAT_VC1_CMD);
+EVENT_ATTR(vc2_cmd,	OCX_TLK_EVENT_STAT_VC2_CMD);
+EVENT_ATTR(vc3_cmd,	OCX_TLK_EVENT_STAT_VC3_CMD);
+EVENT_ATTR(vc4_cmd,	OCX_TLK_EVENT_STAT_VC4_CMD);
+EVENT_ATTR(vc5_cmd,	OCX_TLK_EVENT_STAT_VC5_CMD);
+EVENT_ATTR(vc0_pkt,	OCX_TLK_EVENT_STAT_VC0_PKT);
+EVENT_ATTR(vc1_pkt,	OCX_TLK_EVENT_STAT_VC1_PKT);
+EVENT_ATTR(vc2_pkt,	OCX_TLK_EVENT_STAT_VC2_PKT);
+EVENT_ATTR(vc3_pkt,	OCX_TLK_EVENT_STAT_VC3_PKT);
+EVENT_ATTR(vc4_pkt,	OCX_TLK_EVENT_STAT_VC4_PKT);
+EVENT_ATTR(vc5_pkt,	OCX_TLK_EVENT_STAT_VC5_PKT);
+EVENT_ATTR(vc6_pkt,	OCX_TLK_EVENT_STAT_VC6_PKT);
+EVENT_ATTR(vc7_pkt,	OCX_TLK_EVENT_STAT_VC7_PKT);
+EVENT_ATTR(vc8_pkt,	OCX_TLK_EVENT_STAT_VC8_PKT);
+EVENT_ATTR(vc9_pkt,	OCX_TLK_EVENT_STAT_VC9_PKT);
+EVENT_ATTR(vc10_pkt,	OCX_TLK_EVENT_STAT_VC10_PKT);
+EVENT_ATTR(vc11_pkt,	OCX_TLK_EVENT_STAT_VC11_PKT);
+EVENT_ATTR(vc12_pkt,	OCX_TLK_EVENT_STAT_VC12_PKT);
+EVENT_ATTR(vc13_pkt,	OCX_TLK_EVENT_STAT_VC13_PKT);
+EVENT_ATTR(vc0_con,	OCX_TLK_EVENT_STAT_VC0_CON);
+EVENT_ATTR(vc1_con,	OCX_TLK_EVENT_STAT_VC1_CON);
+EVENT_ATTR(vc2_con,	OCX_TLK_EVENT_STAT_VC2_CON);
+EVENT_ATTR(vc3_con,	OCX_TLK_EVENT_STAT_VC3_CON);
+EVENT_ATTR(vc4_con,	OCX_TLK_EVENT_STAT_VC4_CON);
+EVENT_ATTR(vc5_con,	OCX_TLK_EVENT_STAT_VC5_CON);
+EVENT_ATTR(vc6_con,	OCX_TLK_EVENT_STAT_VC6_CON);
+EVENT_ATTR(vc7_con,	OCX_TLK_EVENT_STAT_VC7_CON);
+EVENT_ATTR(vc8_con,	OCX_TLK_EVENT_STAT_VC8_CON);
+EVENT_ATTR(vc9_con,	OCX_TLK_EVENT_STAT_VC9_CON);
+EVENT_ATTR(vc10_con,	OCX_TLK_EVENT_STAT_VC10_CON);
+EVENT_ATTR(vc11_con,	OCX_TLK_EVENT_STAT_VC11_CON);
+EVENT_ATTR(vc12_con,	OCX_TLK_EVENT_STAT_VC12_CON);
+EVENT_ATTR(vc13_con,	OCX_TLK_EVENT_STAT_VC13_CON);
+
+static struct attribute *thunder_ocx_tlk_events_attr[] = {
+	EVENT_PTR(idle_cnt),
+	EVENT_PTR(data_cnt),
+	EVENT_PTR(sync_cnt),
+	EVENT_PTR(retry_cnt),
+	EVENT_PTR(err_cnt),
+	EVENT_PTR(mat0_cnt),
+	EVENT_PTR(mat1_cnt),
+	EVENT_PTR(mat2_cnt),
+	EVENT_PTR(mat3_cnt),
+	EVENT_PTR(vc0_cmd),
+	EVENT_PTR(vc1_cmd),
+	EVENT_PTR(vc2_cmd),
+	EVENT_PTR(vc3_cmd),
+	EVENT_PTR(vc4_cmd),
+	EVENT_PTR(vc5_cmd),
+	EVENT_PTR(vc0_pkt),
+	EVENT_PTR(vc1_pkt),
+	EVENT_PTR(vc2_pkt),
+	EVENT_PTR(vc3_pkt),
+	EVENT_PTR(vc4_pkt),
+	EVENT_PTR(vc5_pkt),
+	EVENT_PTR(vc6_pkt),
+	EVENT_PTR(vc7_pkt),
+	EVENT_PTR(vc8_pkt),
+	EVENT_PTR(vc9_pkt),
+	EVENT_PTR(vc10_pkt),
+	EVENT_PTR(vc11_pkt),
+	EVENT_PTR(vc12_pkt),
+	EVENT_PTR(vc13_pkt),
+	EVENT_PTR(vc0_con),
+	EVENT_PTR(vc1_con),
+	EVENT_PTR(vc2_con),
+	EVENT_PTR(vc3_con),
+	EVENT_PTR(vc4_con),
+	EVENT_PTR(vc5_con),
+	EVENT_PTR(vc6_con),
+	EVENT_PTR(vc7_con),
+	EVENT_PTR(vc8_con),
+	EVENT_PTR(vc9_con),
+	EVENT_PTR(vc10_con),
+	EVENT_PTR(vc11_con),
+	EVENT_PTR(vc12_con),
+	EVENT_PTR(vc13_con),
+	NULL,
+};
+
+static struct attribute_group thunder_ocx_tlk_events_group = {
+	.name = "events",
+	.attrs = thunder_ocx_tlk_events_attr,
+};
+
+static const struct attribute_group *thunder_ocx_tlk_attr_groups[] = {
+	&thunder_uncore_attr_group,
+	&thunder_ocx_tlk_format_group,
+	&thunder_ocx_tlk_events_group,
+	NULL,
+};
+
+struct pmu thunder_ocx_tlk_pmu = {
+	.attr_groups	= thunder_ocx_tlk_attr_groups,
+	.name		= "thunder_ocx_tlk",
+	.event_init	= thunder_uncore_event_init,
+	.add		= thunder_uncore_add,
+	.del		= thunder_uncore_del,
+	.start		= thunder_uncore_start,
+	.stop		= thunder_uncore_stop,
+	.read		= thunder_uncore_read_ocx_tlk,
+};
+
+static int event_valid(u64 config)
+{
+	if (config <= OCX_TLK_EVENT_STAT_ERR_CNT ||
+	    (config >= OCX_TLK_EVENT_STAT_MAT0_CNT &&
+	     config <= OCX_TLK_EVENT_STAT_MAT3_CNT) ||
+	    (config >= OCX_TLK_EVENT_STAT_VC0_CMD &&
+	     config <= OCX_TLK_EVENT_STAT_VC5_CMD) ||
+	    (config >= OCX_TLK_EVENT_STAT_VC0_PKT &&
+	     config <= OCX_TLK_EVENT_STAT_VC13_PKT) ||
+	    (config >= OCX_TLK_EVENT_STAT_VC0_CON &&
+	     config <= OCX_TLK_EVENT_STAT_VC13_CON))
+		return 1;
+	else
+		return 0;
+}
+
+int __init thunder_uncore_ocx_tlk_setup(void)
+{
+	int ret;
+
+	thunder_uncore_ocx_tlk = kzalloc(sizeof(struct thunder_uncore),
+					 GFP_KERNEL);
+	if (!thunder_uncore_ocx_tlk) {
+		ret = -ENOMEM;
+		goto fail_nomem;
+	}
+
+	ret = thunder_uncore_setup(thunder_uncore_ocx_tlk,
+				   PCI_DEVICE_ID_THUNDER_OCX,
+				   OCX_TLK_CONTROL_OFFSET,
+				   OCX_TLK_UNIT_OFFSET * OCX_TLK_NR_UNITS,
+				   &thunder_ocx_tlk_pmu,
+				   OCX_TLK_NR_COUNTERS);
+	if (ret)
+		goto fail;
+
+	thunder_uncore_ocx_tlk->type = OCX_TLK_TYPE;
+	thunder_uncore_ocx_tlk->event_valid = event_valid;
+	return 0;
+
+fail:
+	kfree(thunder_uncore_ocx_tlk);
+fail_nomem:
+	return ret;
+}
-- 
1.9.1

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