[PATCH v2 2/2] soc: qcom: add l2 cache perf events driver

Adds perf events support for L2 cache PMU.

The L2 cache PMU driver is named 'l2cache_0' and can be used
with perf events to profile L2 events such as cache hits
and misses.

Signed-off-by: Neil Leeder <redacted>
---
 drivers/soc/qcom/Kconfig               |  10 +
 drivers/soc/qcom/Makefile              |   1 +
 drivers/soc/qcom/perf_event_l2.c       | 839 +++++++++++++++++++++++++++++++++
 include/linux/soc/qcom/perf_event_l2.h |  81 ++++
 4 files changed, 931 insertions(+)
 create mode 100644 drivers/soc/qcom/perf_event_l2.c
 create mode 100644 include/linux/soc/qcom/perf_event_l2.h

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 21ec616..0b5ddb9 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig

@@ -19,6 +19,16 @@ config QCOM_L2_ACCESSORS
          Provides support for accessing registers in the L2 cache
          for Qualcomm Technologies chips.

+config QCOM_PERF_EVENTS_L2
+       bool "Qualcomm Technologies L2-cache perf events"

+       depends on ARCH_QCOM && HW_PERF_EVENTS && ACPI
+       select QCOM_L2_ACCESSORS
+         help
+         Provides support for the L2 cache performance monitor unit (PMU)
+         in Qualcomm Technologies processors.
+         Adds the L2 cache PMU into the perf events subsystem for
+         monitoring L2 cache events.
+
 config QCOM_PM
        bool "Qualcomm Power Management"
        depends on ARCH_QCOM && !ARM64

diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 6ef29b9..c8e89ca9 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile

@@ -1,5 +1,6 @@
 obj-$(CONFIG_QCOM_GSBI)        +=      qcom_gsbi.o
 obj-$(CONFIG_QCOM_L2_ACCESSORS) += l2-accessors.o
+obj-$(CONFIG_QCOM_PERF_EVENTS_L2)      += perf_event_l2.o
 obj-$(CONFIG_QCOM_PM)  +=      spm.o
 obj-$(CONFIG_QCOM_SMD) +=      smd.o
 obj-$(CONFIG_QCOM_SMD_RPM)     += smd-rpm.o

diff --git a/drivers/soc/qcom/perf_event_l2.c b/drivers/soc/qcom/perf_event_l2.c
new file mode 100644
index 0000000..54c6790
--- /dev/null
+++ b/drivers/soc/qcom/perf_event_l2.c

@@ -0,0 +1,839 @@
+/* Copyright (c) 2015,2016 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#define pr_fmt(fmt) "l2 perfevents: " fmt
+
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/list.h>
+#include <linux/acpi.h>
+#include <linux/perf_event.h>
+#include <linux/platform_device.h>
+#include <linux/soc/qcom/perf_event_l2.h>
+#include <linux/soc/qcom/l2-accessors.h>
+#include <linux/topology.h>