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From:   Wu Hao <hao.wu@intel.com>
To:     atull@kernel.org, mdf@kernel.org, linux-fpga@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     linux-api@vger.kernel.org, Wu Hao <hao.wu@intel.com>,
        Luwei Kang <luwei.kang@intel.com>,
        Xu Yilun <yilun.xu@intel.com>
Subject: [PATCH v2 18/18] fpga: dfl: fme: add performance reporting support
Date:   Mon, 29 Apr 2019 16:55:51 +0800
Message-Id: <1556528151-17221-19-git-send-email-hao.wu@intel.com>
In-Reply-To: <1556528151-17221-1-git-send-email-hao.wu@intel.com>
References: <1556528151-17221-1-git-send-email-hao.wu@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This patch adds support for performance reporting private feature
for FPGA Management Engine (FME). Actually it supports 4 categories
performance counters, 'clock', 'cache', 'iommu' and 'fabric', user
could read the performance counter via exposed sysfs interfaces.
Please refer to sysfs doc for more details.

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
---
v2: improve sysfs doc
---
 Documentation/ABI/testing/sysfs-platform-dfl-fme |  93 +++
 drivers/fpga/Makefile                            |   1 +
 drivers/fpga/dfl-fme-main.c                      |   4 +
 drivers/fpga/dfl-fme-perf.c                      | 950 +++++++++++++++++++++++
 drivers/fpga/dfl-fme.h                           |   2 +
 drivers/fpga/dfl.c                               |   1 +
 drivers/fpga/dfl.h                               |   2 +
 7 files changed, 1053 insertions(+)
 create mode 100644 drivers/fpga/dfl-fme-perf.c

diff --git a/Documentation/ABI/testing/sysfs-platform-dfl-fme b/Documentation/ABI/testing/sysfs-platform-dfl-fme
index 503984b..a7f7eb6 100644
--- a/Documentation/ABI/testing/sysfs-platform-dfl-fme
+++ b/Documentation/ABI/testing/sysfs-platform-dfl-fme
@@ -250,3 +250,96 @@ Description:	Write-only. Write error code to this file to clear all errors
 		logged in errors, first_error and next_error. Write fails with
 		-EINVAL if input parsing fails or input error code doesn't
 		match.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/clock
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read for Accelerator Function Unit (AFU) clock
+		counter.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/cache/freeze
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Write. Read this file for the current status of 'cache'
+		category performance counters, and Write '1' or '0' to freeze
+		or unfreeze 'cache' performance counters.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/cache/<counter>
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read 'cache' category performance counters:
+		read_hit, read_miss, write_hit, write_miss, hold_request,
+		data_write_port_contention, tag_write_port_contention,
+		tx_req_stall, rx_req_stall and rx_eviction.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/iommu/freeze
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Write. Read this file for the current status of 'iommu'
+		category performance counters, and Write '1' or '0' to freeze
+		or unfreeze 'iommu' performance counters.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/iommu/<sip_counter>
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read 'iommu' category 'sip' sub category
+		performance counters: iotlb_4k_hit, iotlb_2m_hit,
+		iotlb_1g_hit, slpwc_l3_hit, slpwc_l4_hit, rcc_hit,
+		rcc_miss, iotlb_4k_miss, iotlb_2m_miss, iotlb_1g_miss,
+		slpwc_l3_miss and slpwc_l4_miss.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/iommu/afu0/<counter>
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read 'iommu' category 'afuX' sub category
+		performance counters: read_transaction, write_transaction,
+		devtlb_read_hit, devtlb_write_hit, devtlb_4k_fill,
+		devtlb_2m_fill and devtlb_1g_fill.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/fabric/freeze
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Write. Read this file for the current status of 'fabric'
+		category performance counters, and Write '1' or '0' to freeze
+		or unfreeze 'fabric' performance counters.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/fabric/<counter>
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read 'fabric' category performance counters:
+		pcie0_read, pcie0_write, pcie1_read, pcie1_write,
+		upi_read, upi_write and mmio_read.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/fabric/enable
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Write. Read this file for current status of device level
+		fabric counters. Write "1" to enable device level fabric
+		counters. Once device level fabric counters are enabled, port
+		level fabric counters will be disabled automatically.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/fabric/port0/<counter>
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Only. Read 'fabric' category "portX" sub category
+		performance counters: pcie0_read, pcie0_write, pcie1_read,
+		pcie1_write, upi_read, upi_write and mmio_read.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/perf/fabric/port0/enable
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@intel.com>
+Description:	Read-Write. Read this file for current status of port level
+		fabric counters. Write "1" to enable port level fabric counters.
+		Once port level fabric counters are enabled, device level fabric
+		counters will be disabled automatically.
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 1a9fa3d..7df3971 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_FPGA_DFL_FME_REGION)	+= dfl-fme-region.o
 obj-$(CONFIG_FPGA_DFL_AFU)		+= dfl-afu.o
 
 dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o dfl-fme-error.o
+dfl-fme-objs += dfl-fme-perf.o
 dfl-afu-objs := dfl-afu-main.o dfl-afu-region.o dfl-afu-dma-region.o
 dfl-afu-objs += dfl-afu-error.o
 
diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
index 1986b32..221f4ec 100644
--- a/drivers/fpga/dfl-fme-main.c
+++ b/drivers/fpga/dfl-fme-main.c
@@ -690,6 +690,10 @@ static void fme_power_mgmt_uinit(struct platform_device *pdev,
 		.ops = &fme_global_err_ops,
 	},
 	{
+		.id_table = fme_perf_id_table,
+		.ops = &fme_perf_ops,
+	},
+	{
 		.ops = NULL,
 	},
 };
diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
new file mode 100644
index 0000000..035bb68
--- /dev/null
+++ b/drivers/fpga/dfl-fme-perf.c
@@ -0,0 +1,950 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for FPGA Management Engine (FME) Global Performance Reporting
+ *
+ * Copyright 2019 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Kang Luwei <luwei.kang@intel.com>
+ *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *   Wu Hao <hao.wu@intel.com>
+ *   Joseph Grecco <joe.grecco@intel.com>
+ *   Enno Luebbers <enno.luebbers@intel.com>
+ *   Tim Whisonant <tim.whisonant@intel.com>
+ *   Ananda Ravuri <ananda.ravuri@intel.com>
+ *   Mitchel, Henry <henry.mitchel@intel.com>
+ */
+
+#include "dfl.h"
+#include "dfl-fme.h"
+
+/*
+ * Performance Counter Registers for Cache.
+ *
+ * Cache Events are listed below as CACHE_EVNT_*.
+ */
+#define CACHE_CTRL			0x8
+#define CACHE_RESET_CNTR		BIT_ULL(0)
+#define CACHE_FREEZE_CNTR		BIT_ULL(8)
+#define CACHE_CTRL_EVNT			GENMASK_ULL(19, 16)
+#define CACHE_EVNT_RD_HIT		0x0
+#define CACHE_EVNT_WR_HIT		0x1
+#define CACHE_EVNT_RD_MISS		0x2
+#define CACHE_EVNT_WR_MISS		0x3
+#define CACHE_EVNT_RSVD			0x4
+#define CACHE_EVNT_HOLD_REQ		0x5
+#define CACHE_EVNT_DATA_WR_PORT_CONTEN	0x6
+#define CACHE_EVNT_TAG_WR_PORT_CONTEN	0x7
+#define CACHE_EVNT_TX_REQ_STALL		0x8
+#define CACHE_EVNT_RX_REQ_STALL		0x9
+#define CACHE_EVNT_EVICTIONS		0xa
+#define CACHE_EVNT_MAX			CACHE_EVNT_EVICTIONS
+#define CACHE_CHANNEL_SEL		BIT_ULL(20)
+#define CACHE_CHANNEL_RD		0
+#define CACHE_CHANNEL_WR		1
+#define CACHE_CHANNEL_MAX		2
+#define CACHE_CNTR0			0x10
+#define CACHE_CNTR1			0x18
+#define CACHE_CNTR_EVNT_CNTR		GENMASK_ULL(47, 0)
+#define CACHE_CNTR_EVNT			GENMASK_ULL(63, 60)
+
+/*
+ * Performance Counter Registers for Fabric.
+ *
+ * Fabric Events are listed below as FAB_EVNT_*
+ */
+#define FAB_CTRL			0x20
+#define FAB_RESET_CNTR			BIT_ULL(0)
+#define FAB_FREEZE_CNTR			BIT_ULL(8)
+#define FAB_CTRL_EVNT			GENMASK_ULL(19, 16)
+#define FAB_EVNT_PCIE0_RD		0x0
+#define FAB_EVNT_PCIE0_WR		0x1
+#define FAB_EVNT_PCIE1_RD		0x2
+#define FAB_EVNT_PCIE1_WR		0x3
+#define FAB_EVNT_UPI_RD			0x4
+#define FAB_EVNT_UPI_WR			0x5
+#define FAB_EVNT_MMIO_RD		0x6
+#define FAB_EVNT_MMIO_WR		0x7
+#define FAB_EVNT_MAX			FAB_EVNT_MMIO_WR
+#define FAB_PORT_ID			GENMASK_ULL(21, 20)
+#define FAB_PORT_FILTER			BIT_ULL(23)
+#define FAB_PORT_FILTER_DISABLE		0
+#define FAB_PORT_FILTER_ENABLE		1
+#define FAB_CNTR			0x28
+#define FAB_CNTR_EVNT_CNTR		GENMASK_ULL(59, 0)
+#define FAB_CNTR_EVNT			GENMASK_ULL(63, 60)
+
+/*
+ * Performance Counter Registers for Clock.
+ *
+ * Clock Counter can't be reset or frozen by SW.
+ */
+#define CLK_CNTR			0x30
+
+/*
+ * Performance Counter Registers for IOMMU / VT-D.
+ *
+ * VT-D Events are listed below as VTD_EVNT_* and VTD_SIP_EVNT_*
+ */
+#define VTD_CTRL			0x38
+#define VTD_RESET_CNTR			BIT_ULL(0)
+#define VTD_FREEZE_CNTR			BIT_ULL(8)
+#define VTD_CTRL_EVNT			GENMASK_ULL(19, 16)
+#define VTD_EVNT_AFU_MEM_RD_TRANS	0x0
+#define VTD_EVNT_AFU_MEM_WR_TRANS	0x1
+#define VTD_EVNT_AFU_DEVTLB_RD_HIT	0x2
+#define VTD_EVNT_AFU_DEVTLB_WR_HIT	0x3
+#define VTD_EVNT_DEVTLB_4K_FILL		0x4
+#define VTD_EVNT_DEVTLB_2M_FILL		0x5
+#define VTD_EVNT_DEVTLB_1G_FILL		0x6
+#define VTD_EVNT_MAX			VTD_EVNT_DEVTLB_1G_FILL
+#define VTD_CNTR			0x40
+#define VTD_CNTR_EVNT			GENMASK_ULL(63, 60)
+#define VTD_CNTR_EVNT_CNTR		GENMASK_ULL(47, 0)
+#define VTD_SIP_CTRL			0x48
+#define VTD_SIP_RESET_CNTR		BIT_ULL(0)
+#define VTD_SIP_FREEZE_CNTR		BIT_ULL(8)
+#define VTD_SIP_CTRL_EVNT		GENMASK_ULL(19, 16)
+#define VTD_SIP_EVNT_IOTLB_4K_HIT	0x0
+#define VTD_SIP_EVNT_IOTLB_2M_HIT	0x1
+#define VTD_SIP_EVNT_IOTLB_1G_HIT	0x2
+#define VTD_SIP_EVNT_SLPWC_L3_HIT	0x3
+#define VTD_SIP_EVNT_SLPWC_L4_HIT	0x4
+#define VTD_SIP_EVNT_RCC_HIT		0x5
+#define VTD_SIP_EVNT_IOTLB_4K_MISS	0x6
+#define VTD_SIP_EVNT_IOTLB_2M_MISS	0x7
+#define VTD_SIP_EVNT_IOTLB_1G_MISS	0x8
+#define VTD_SIP_EVNT_SLPWC_L3_MISS	0x9
+#define VTD_SIP_EVNT_SLPWC_L4_MISS	0xa
+#define VTD_SIP_EVNT_RCC_MISS		0xb
+#define VTD_SIP_EVNT_MAX		VTD_SIP_EVNT_RCC_MISS
+#define VTD_SIP_CNTR			0X50
+#define VTD_SIP_CNTR_EVNT		GENMASK_ULL(63, 60)
+#define VTD_SIP_CNTR_EVNT_CNTR		GENMASK_ULL(47, 0)
+
+#define PERF_OBJ_ROOT_ID		(~0)
+
+#define PERF_TIMEOUT			30
+
+/**
+ * struct perf_object - object of performance counter
+ *
+ * @id: instance id. PERF_OBJ_ROOT_ID indicates it is a parent object which
+ *      counts performance counters for all instances.
+ * @attr_groups: the sysfs files are associated with this object.
+ * @feature: pointer to related private feature.
+ * @node: used to link itself to parent's children list.
+ * @children: used to link its children objects together.
+ * @kobj: generic kobject interface.
+ *
+ * 'node' and 'children' are used to construct parent-children hierarchy.
+ */
+struct perf_object {
+	int id;
+	const struct attribute_group **attr_groups;
+	struct dfl_feature *feature;
+
+	struct list_head node;
+	struct list_head children;
+	struct kobject kobj;
+};
+
+/**
+ * struct perf_obj_attribute - attribute of perf object
+ *
+ * @attr: attribute of this perf object.
+ * @show: show callback for sysfs attribute.
+ * @store: store callback for sysfs attribute.
+ */
+struct perf_obj_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct perf_object *pobj, char *buf);
+	ssize_t (*store)(struct perf_object *pobj,
+			 const char *buf, size_t n);
+};
+
+#define to_perf_obj_attr(_attr)					\
+		container_of(_attr, struct perf_obj_attribute, attr)
+#define to_perf_obj(_kobj)					\
+		container_of(_kobj, struct perf_object, kobj)
+
+#define PERF_OBJ_ATTR(_name, _filename, _mode, _show, _store)	\
+struct perf_obj_attribute perf_obj_attr_##_name =		\
+	__ATTR(_filename, _mode, _show, _store)
+
+#define PERF_OBJ_ATTR_RW(_name)					\
+	struct perf_obj_attribute perf_obj_attr_##_name = __ATTR_RW(_name)
+#define PERF_OBJ_ATTR_RO(_name)					\
+	struct perf_obj_attribute perf_obj_attr_##_name = __ATTR_RO(_name)
+#define PERF_OBJ_ATTR_WO(_name)					\
+	struct perf_obj_attribute perf_obj_attr_##_name = __ATTR_WO(_name)
+
+static ssize_t perf_obj_attr_show(struct kobject *kobj,
+				  struct attribute *__attr, char *buf)
+{
+	struct perf_obj_attribute *attr = to_perf_obj_attr(__attr);
+	struct perf_object *pobj = to_perf_obj(kobj);
+	ssize_t ret = -EIO;
+
+	if (attr->show)
+		ret = attr->show(pobj, buf);
+	return ret;
+}
+
+static ssize_t perf_obj_attr_store(struct kobject *kobj,
+				   struct attribute *__attr,
+				   const char *buf, size_t n)
+{
+	struct perf_obj_attribute *attr = to_perf_obj_attr(__attr);
+	struct perf_object *pobj = to_perf_obj(kobj);
+	ssize_t ret = -EIO;
+
+	if (attr->store)
+		ret = attr->store(pobj, buf, n);
+	return ret;
+}
+
+static const struct sysfs_ops perf_obj_sysfs_ops = {
+	.show = perf_obj_attr_show,
+	.store = perf_obj_attr_store,
+};
+
+static void perf_obj_release(struct kobject *kobj)
+{
+	kfree(to_perf_obj(kobj));
+}
+
+static struct kobj_type perf_obj_ktype = {
+	.sysfs_ops = &perf_obj_sysfs_ops,
+	.release = perf_obj_release,
+};
+
+static struct perf_object *
+create_perf_obj(struct dfl_feature *feature, struct kobject *parent, int id,
+		const struct attribute_group **groups, const char *name)
+{
+	struct perf_object *pobj;
+	int ret;
+
+	pobj = kzalloc(sizeof(*pobj), GFP_KERNEL);
+	if (!pobj)
+		return ERR_PTR(-ENOMEM);
+
+	pobj->id = id;
+	pobj->feature = feature;
+	pobj->attr_groups = groups;
+	INIT_LIST_HEAD(&pobj->node);
+	INIT_LIST_HEAD(&pobj->children);
+
+	if (id != PERF_OBJ_ROOT_ID)
+		ret = kobject_init_and_add(&pobj->kobj, &perf_obj_ktype,
+					   parent, "%s%d", name, id);
+	else
+		ret = kobject_init_and_add(&pobj->kobj, &perf_obj_ktype,
+					   parent, "%s", name);
+	if (ret)
+		goto put_exit;
+
+	if (pobj->attr_groups) {
+		ret = sysfs_create_groups(&pobj->kobj, pobj->attr_groups);
+		if (ret)
+			goto del_exit;
+	}
+
+	return pobj;
+
+del_exit:
+	kobject_del(&pobj->kobj);
+put_exit:
+	kobject_put(&pobj->kobj);
+	return ERR_PTR(ret);
+}
+
+/*
+ * Counter Sysfs Interface for Clock.
+ */
+static ssize_t clock_show(struct perf_object *pobj, char *buf)
+{
+	void __iomem *base = pobj->feature->ioaddr;
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n",
+			 (unsigned long long)readq(base + CLK_CNTR));
+}
+static PERF_OBJ_ATTR_RO(clock);
+
+static struct attribute *clock_attrs[] = {
+	&perf_obj_attr_clock.attr,
+	NULL,
+};
+
+static struct attribute_group clock_attr_group = {
+	.attrs = clock_attrs,
+};
+
+static const struct attribute_group *perf_dev_attr_groups[] = {
+	&clock_attr_group,
+	NULL,
+};
+
+static void destroy_perf_obj(struct perf_object *pobj)
+{
+	struct perf_object *obj, *obj_tmp;
+
+	list_for_each_entry_safe(obj, obj_tmp, &pobj->children, node)
+		destroy_perf_obj(obj);
+
+	list_del(&pobj->node);
+	if (pobj->attr_groups)
+		sysfs_remove_groups(&pobj->kobj, pobj->attr_groups);
+	kobject_put(&pobj->kobj);
+}
+
+static struct perf_object *create_perf_dev(struct dfl_feature *feature)
+{
+	struct platform_device *pdev = feature->pdev;
+
+	return create_perf_obj(feature, &pdev->dev.kobj, PERF_OBJ_ROOT_ID,
+			       perf_dev_attr_groups, "perf");
+}
+
+/*
+ * Counter Sysfs Interfaces for Cache.
+ */
+static ssize_t cache_freeze_show(struct perf_object *pobj, char *buf)
+{
+	void __iomem *base = pobj->feature->ioaddr;
+	u64 v;
+
+	v = readq(base + CACHE_CTRL);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			 (unsigned int)FIELD_GET(CACHE_FREEZE_CNTR, v));
+}
+
+static ssize_t cache_freeze_store(struct perf_object *pobj,
+				  const char *buf, size_t n)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	bool state;
+	u64 v;
+
+	if (strtobool(buf, &state))
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + CACHE_CTRL);
+	v &= ~CACHE_FREEZE_CNTR;
+	v |= FIELD_PREP(CACHE_FREEZE_CNTR, state ? 1 : 0);
+	writeq(v, base + CACHE_CTRL);
+	mutex_unlock(&pdata->lock);
+
+	return n;
+}
+static PERF_OBJ_ATTR(cache_freeze, freeze, 0644,
+		     cache_freeze_show, cache_freeze_store);
+
+static ssize_t read_cache_counter(struct perf_object *pobj, char *buf,
+				  u8 channel, u8 event)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	u64 v, count;
+
+	if (event > CACHE_EVNT_MAX || channel > CACHE_CHANNEL_MAX)
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	/* set channel access type and cache event code. */
+	v = readq(base + CACHE_CTRL);
+	v &= ~(CACHE_CHANNEL_SEL | CACHE_CTRL_EVNT);
+	v |= FIELD_PREP(CACHE_CHANNEL_SEL, channel);
+	v |= FIELD_PREP(CACHE_CTRL_EVNT, event);
+	writeq(v, base + CACHE_CTRL);
+
+	if (readq_poll_timeout(base + CACHE_CNTR0, v,
+			       FIELD_GET(CACHE_CNTR_EVNT, v) == event,
+			       1, PERF_TIMEOUT)) {
+		dev_err(&feature->pdev->dev, "timeout, unmatched cache event type in counter registers.\n");
+		mutex_unlock(&pdata->lock);
+		return -ETIMEDOUT;
+	}
+
+	v = readq(base + CACHE_CNTR0);
+	count = FIELD_GET(CACHE_CNTR_EVNT_CNTR, v);
+	v = readq(base + CACHE_CNTR1);
+	count += FIELD_GET(CACHE_CNTR_EVNT_CNTR, v);
+	mutex_unlock(&pdata->lock);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)count);
+}
+
+#define CACHE_SHOW(name, type, event)					\
+static ssize_t name##_show(struct perf_object *pobj, char *buf)		\
+{									\
+	return read_cache_counter(pobj, buf, type, event);		\
+}									\
+static PERF_OBJ_ATTR_RO(name)
+
+CACHE_SHOW(read_hit, CACHE_CHANNEL_RD, CACHE_EVNT_RD_HIT);
+CACHE_SHOW(read_miss, CACHE_CHANNEL_RD, CACHE_EVNT_RD_MISS);
+CACHE_SHOW(write_hit, CACHE_CHANNEL_WR, CACHE_EVNT_WR_HIT);
+CACHE_SHOW(write_miss, CACHE_CHANNEL_WR, CACHE_EVNT_WR_MISS);
+CACHE_SHOW(hold_request, CACHE_CHANNEL_RD, CACHE_EVNT_HOLD_REQ);
+CACHE_SHOW(tx_req_stall, CACHE_CHANNEL_RD, CACHE_EVNT_TX_REQ_STALL);
+CACHE_SHOW(rx_req_stall, CACHE_CHANNEL_RD, CACHE_EVNT_RX_REQ_STALL);
+CACHE_SHOW(rx_eviction, CACHE_CHANNEL_RD, CACHE_EVNT_EVICTIONS);
+CACHE_SHOW(data_write_port_contention, CACHE_CHANNEL_WR,
+	   CACHE_EVNT_DATA_WR_PORT_CONTEN);
+CACHE_SHOW(tag_write_port_contention, CACHE_CHANNEL_WR,
+	   CACHE_EVNT_TAG_WR_PORT_CONTEN);
+
+static struct attribute *cache_attrs[] = {
+	&perf_obj_attr_read_hit.attr,
+	&perf_obj_attr_read_miss.attr,
+	&perf_obj_attr_write_hit.attr,
+	&perf_obj_attr_write_miss.attr,
+	&perf_obj_attr_hold_request.attr,
+	&perf_obj_attr_data_write_port_contention.attr,
+	&perf_obj_attr_tag_write_port_contention.attr,
+	&perf_obj_attr_tx_req_stall.attr,
+	&perf_obj_attr_rx_req_stall.attr,
+	&perf_obj_attr_rx_eviction.attr,
+	&perf_obj_attr_cache_freeze.attr,
+	NULL,
+};
+
+static struct attribute_group cache_attr_group = {
+	.attrs = cache_attrs,
+};
+
+static const struct attribute_group *cache_attr_groups[] = {
+	&cache_attr_group,
+	NULL,
+};
+
+static int create_perf_cache_obj(struct perf_object *perf_dev)
+{
+	struct perf_object *pobj;
+
+	pobj = create_perf_obj(perf_dev->feature, &perf_dev->kobj,
+			       PERF_OBJ_ROOT_ID, cache_attr_groups, "cache");
+	if (IS_ERR(pobj))
+		return PTR_ERR(pobj);
+
+	list_add(&pobj->node, &perf_dev->children);
+
+	return 0;
+}
+
+/*
+ * Counter Sysfs Interfaces for VT-D / IOMMU.
+ */
+static ssize_t vtd_freeze_show(struct perf_object *pobj, char *buf)
+{
+	void __iomem *base = pobj->feature->ioaddr;
+	u64 v;
+
+	v = readq(base + VTD_CTRL);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			 (unsigned int)FIELD_GET(VTD_FREEZE_CNTR, v));
+}
+
+static ssize_t vtd_freeze_store(struct perf_object *pobj,
+				const char *buf, size_t n)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	bool state;
+	u64 v;
+
+	if (strtobool(buf, &state))
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + VTD_CTRL);
+	v &= ~VTD_FREEZE_CNTR;
+	v |= FIELD_PREP(VTD_FREEZE_CNTR, state ? 1 : 0);
+	writeq(v, base + VTD_CTRL);
+	mutex_unlock(&pdata->lock);
+
+	return n;
+}
+static PERF_OBJ_ATTR(vtd_freeze, freeze, 0644,
+		     vtd_freeze_show, vtd_freeze_store);
+
+static struct attribute *iommu_top_attrs[] = {
+	&perf_obj_attr_vtd_freeze.attr,
+	NULL,
+};
+
+static struct attribute_group iommu_top_attr_group = {
+	.attrs = iommu_top_attrs,
+};
+
+static ssize_t read_iommu_sip_counter(struct perf_object *pobj,
+				      u8 event, char *buf)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	u64 v, count;
+
+	if (event > VTD_SIP_EVNT_MAX)
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + VTD_SIP_CTRL);
+	v &= ~VTD_SIP_CTRL_EVNT;
+	v |= FIELD_PREP(VTD_SIP_CTRL_EVNT, event);
+	writeq(v, base + VTD_SIP_CTRL);
+
+	if (readq_poll_timeout(base + VTD_SIP_CNTR, v,
+			       FIELD_GET(VTD_SIP_CNTR_EVNT, v) == event,
+			       1, PERF_TIMEOUT)) {
+		dev_err(&feature->pdev->dev, "timeout, unmatched VTd SIP event type in counter registers\n");
+		mutex_unlock(&pdata->lock);
+		return -ETIMEDOUT;
+	}
+
+	v = readq(base + VTD_SIP_CNTR);
+	count = FIELD_GET(VTD_SIP_CNTR_EVNT_CNTR, v);
+	mutex_unlock(&pdata->lock);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)count);
+}
+
+#define VTD_SIP_SHOW(name, event)					\
+static ssize_t name##_show(struct perf_object *pobj, char *buf)		\
+{									\
+	return read_iommu_sip_counter(pobj, event, buf);		\
+}									\
+static PERF_OBJ_ATTR_RO(name)
+
+VTD_SIP_SHOW(iotlb_4k_hit, VTD_SIP_EVNT_IOTLB_4K_HIT);
+VTD_SIP_SHOW(iotlb_2m_hit, VTD_SIP_EVNT_IOTLB_2M_HIT);
+VTD_SIP_SHOW(iotlb_1g_hit, VTD_SIP_EVNT_IOTLB_1G_HIT);
+VTD_SIP_SHOW(slpwc_l3_hit, VTD_SIP_EVNT_SLPWC_L3_HIT);
+VTD_SIP_SHOW(slpwc_l4_hit, VTD_SIP_EVNT_SLPWC_L4_HIT);
+VTD_SIP_SHOW(rcc_hit, VTD_SIP_EVNT_RCC_HIT);
+VTD_SIP_SHOW(iotlb_4k_miss, VTD_SIP_EVNT_IOTLB_4K_MISS);
+VTD_SIP_SHOW(iotlb_2m_miss, VTD_SIP_EVNT_IOTLB_2M_MISS);
+VTD_SIP_SHOW(iotlb_1g_miss, VTD_SIP_EVNT_IOTLB_1G_MISS);
+VTD_SIP_SHOW(slpwc_l3_miss, VTD_SIP_EVNT_SLPWC_L3_MISS);
+VTD_SIP_SHOW(slpwc_l4_miss, VTD_SIP_EVNT_SLPWC_L4_MISS);
+VTD_SIP_SHOW(rcc_miss, VTD_SIP_EVNT_RCC_MISS);
+
+static struct attribute *iommu_sip_attrs[] = {
+	&perf_obj_attr_iotlb_4k_hit.attr,
+	&perf_obj_attr_iotlb_2m_hit.attr,
+	&perf_obj_attr_iotlb_1g_hit.attr,
+	&perf_obj_attr_slpwc_l3_hit.attr,
+	&perf_obj_attr_slpwc_l4_hit.attr,
+	&perf_obj_attr_rcc_hit.attr,
+	&perf_obj_attr_iotlb_4k_miss.attr,
+	&perf_obj_attr_iotlb_2m_miss.attr,
+	&perf_obj_attr_iotlb_1g_miss.attr,
+	&perf_obj_attr_slpwc_l3_miss.attr,
+	&perf_obj_attr_slpwc_l4_miss.attr,
+	&perf_obj_attr_rcc_miss.attr,
+	NULL,
+};
+
+static struct attribute_group iommu_sip_attr_group = {
+	.attrs = iommu_sip_attrs,
+};
+
+static const struct attribute_group *iommu_top_attr_groups[] = {
+	&iommu_top_attr_group,
+	&iommu_sip_attr_group,
+	NULL,
+};
+
+static ssize_t read_iommu_counter(struct perf_object *pobj, u8 event, char *buf)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	u64 v, count;
+
+	if (event > VTD_EVNT_MAX)
+		return -EINVAL;
+
+	event += pobj->id;
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + VTD_CTRL);
+	v &= ~VTD_CTRL_EVNT;
+	v |= FIELD_PREP(VTD_CTRL_EVNT, event);
+	writeq(v, base + VTD_CTRL);
+
+	if (readq_poll_timeout(base + VTD_CNTR, v,
+			       FIELD_GET(VTD_CNTR_EVNT, v) == event, 1,
+			       PERF_TIMEOUT)) {
+		dev_err(&feature->pdev->dev, "timeout, unmatched VTd event type in counter registers\n");
+		mutex_unlock(&pdata->lock);
+		return -ETIMEDOUT;
+	}
+
+	v = readq(base + VTD_CNTR);
+	count = FIELD_GET(VTD_CNTR_EVNT_CNTR, v);
+	mutex_unlock(&pdata->lock);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)count);
+}
+
+#define VTD_SHOW(name, base_event)					\
+static ssize_t name##_show(struct perf_object *pobj, char *buf)		\
+{									\
+	return read_iommu_counter(pobj, base_event, buf);		\
+}									\
+static PERF_OBJ_ATTR_RO(name)
+
+VTD_SHOW(read_transaction, VTD_EVNT_AFU_MEM_RD_TRANS);
+VTD_SHOW(write_transaction, VTD_EVNT_AFU_MEM_WR_TRANS);
+VTD_SHOW(devtlb_read_hit, VTD_EVNT_AFU_DEVTLB_RD_HIT);
+VTD_SHOW(devtlb_write_hit, VTD_EVNT_AFU_DEVTLB_WR_HIT);
+VTD_SHOW(devtlb_4k_fill, VTD_EVNT_DEVTLB_4K_FILL);
+VTD_SHOW(devtlb_2m_fill, VTD_EVNT_DEVTLB_2M_FILL);
+VTD_SHOW(devtlb_1g_fill, VTD_EVNT_DEVTLB_1G_FILL);
+
+static struct attribute *iommu_attrs[] = {
+	&perf_obj_attr_read_transaction.attr,
+	&perf_obj_attr_write_transaction.attr,
+	&perf_obj_attr_devtlb_read_hit.attr,
+	&perf_obj_attr_devtlb_write_hit.attr,
+	&perf_obj_attr_devtlb_4k_fill.attr,
+	&perf_obj_attr_devtlb_2m_fill.attr,
+	&perf_obj_attr_devtlb_1g_fill.attr,
+	NULL,
+};
+
+static struct attribute_group iommu_attr_group = {
+	.attrs = iommu_attrs,
+};
+
+static const struct attribute_group *iommu_attr_groups[] = {
+	&iommu_attr_group,
+	NULL,
+};
+
+#define PERF_MAX_PORT_NUM	1
+
+static int create_perf_iommu_obj(struct perf_object *perf_dev)
+{
+	struct dfl_feature *feature = perf_dev->feature;
+	struct device *dev = &feature->pdev->dev;
+	struct perf_object *pobj, *obj;
+	void __iomem *base;
+	u64 v;
+	int i;
+
+	/* check if iommu is not supported on this device. */
+	base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_HEADER);
+	v = readq(base + FME_HDR_CAP);
+	if (!FIELD_GET(FME_CAP_IOMMU_AVL, v))
+		return 0;
+
+	pobj = create_perf_obj(feature, &perf_dev->kobj, PERF_OBJ_ROOT_ID,
+			       iommu_top_attr_groups, "iommu");
+	if (IS_ERR(pobj))
+		return PTR_ERR(pobj);
+
+	list_add(&pobj->node, &perf_dev->children);
+
+	for (i = 0; i < PERF_MAX_PORT_NUM; i++) {
+		obj = create_perf_obj(feature, &pobj->kobj, i,
+				      iommu_attr_groups, "afu");
+		if (IS_ERR(obj))
+			return PTR_ERR(obj);
+
+		list_add(&obj->node, &pobj->children);
+	}
+
+	return 0;
+}
+
+/*
+ * Counter Sysfs Interfaces for Fabric
+ */
+static bool fabric_pobj_is_enabled(struct perf_object *pobj)
+{
+	struct dfl_feature *feature = pobj->feature;
+	void __iomem *base = feature->ioaddr;
+	u64 v;
+
+	v = readq(base + FAB_CTRL);
+
+	if (FIELD_GET(FAB_PORT_FILTER, v) == FAB_PORT_FILTER_DISABLE)
+		return pobj->id == PERF_OBJ_ROOT_ID;
+
+	return pobj->id == FIELD_GET(FAB_PORT_ID, v);
+}
+
+static ssize_t read_fabric_counter(struct perf_object *pobj,
+				   u8 event, char *buf)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	u64 v, count = 0;
+
+	if (event > FAB_EVNT_MAX)
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	/* if it is disabled, force the counter to return zero. */
+	if (!fabric_pobj_is_enabled(pobj))
+		goto exit;
+
+	v = readq(base + FAB_CTRL);
+	v &= ~FAB_CTRL_EVNT;
+	v |= FIELD_PREP(FAB_CTRL_EVNT, event);
+	writeq(v, base + FAB_CTRL);
+
+	if (readq_poll_timeout(base + FAB_CNTR, v,
+			       FIELD_GET(FAB_CNTR_EVNT, v) == event,
+			       1, PERF_TIMEOUT)) {
+		dev_err(&feature->pdev->dev, "timeout, unmatched fab event type in counter registers.\n");
+		mutex_unlock(&pdata->lock);
+		return -ETIMEDOUT;
+	}
+
+	v = readq(base + FAB_CNTR);
+	count = FIELD_GET(FAB_CNTR_EVNT_CNTR, v);
+exit:
+	mutex_unlock(&pdata->lock);
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)count);
+}
+
+#define FAB_SHOW(name, event)						\
+static ssize_t name##_show(struct perf_object *pobj, char *buf)		\
+{									\
+	return read_fabric_counter(pobj, event, buf);			\
+}									\
+static PERF_OBJ_ATTR_RO(name)
+
+FAB_SHOW(pcie0_read, FAB_EVNT_PCIE0_RD);
+FAB_SHOW(pcie0_write, FAB_EVNT_PCIE0_WR);
+FAB_SHOW(pcie1_read, FAB_EVNT_PCIE1_RD);
+FAB_SHOW(pcie1_write, FAB_EVNT_PCIE1_WR);
+FAB_SHOW(upi_read, FAB_EVNT_UPI_RD);
+FAB_SHOW(upi_write, FAB_EVNT_UPI_WR);
+FAB_SHOW(mmio_read, FAB_EVNT_MMIO_RD);
+FAB_SHOW(mmio_write, FAB_EVNT_MMIO_WR);
+
+static ssize_t fab_enable_show(struct perf_object *pobj, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			 (unsigned int)!!fabric_pobj_is_enabled(pobj));
+}
+
+/*
+ * If enable one port or all port event counter in fabric, other
+ * fabric event counter originally enabled will be disable automatically.
+ */
+static ssize_t fab_enable_store(struct perf_object *pobj,
+				const char *buf, size_t n)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	bool state;
+	u64 v;
+
+	if (strtobool(buf, &state) || !state)
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	/* if it is already enabled. */
+	if (fabric_pobj_is_enabled(pobj))
+		return n;
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + FAB_CTRL);
+	v &= ~(FAB_PORT_FILTER | FAB_PORT_ID);
+
+	if (pobj->id == PERF_OBJ_ROOT_ID) {
+		v |= FIELD_PREP(FAB_PORT_FILTER, FAB_PORT_FILTER_DISABLE);
+	} else {
+		v |= FIELD_PREP(FAB_PORT_FILTER, FAB_PORT_FILTER_ENABLE);
+		v |= FIELD_PREP(FAB_PORT_ID, pobj->id);
+	}
+	writeq(v, base + FAB_CTRL);
+	mutex_unlock(&pdata->lock);
+
+	return n;
+}
+static PERF_OBJ_ATTR(fab_enable, enable, 0644,
+		     fab_enable_show, fab_enable_store);
+
+static struct attribute *fabric_attrs[] = {
+	&perf_obj_attr_pcie0_read.attr,
+	&perf_obj_attr_pcie0_write.attr,
+	&perf_obj_attr_pcie1_read.attr,
+	&perf_obj_attr_pcie1_write.attr,
+	&perf_obj_attr_upi_read.attr,
+	&perf_obj_attr_upi_write.attr,
+	&perf_obj_attr_mmio_read.attr,
+	&perf_obj_attr_mmio_write.attr,
+	&perf_obj_attr_fab_enable.attr,
+	NULL,
+};
+
+static struct attribute_group fabric_attr_group = {
+	.attrs = fabric_attrs,
+};
+
+static const struct attribute_group *fabric_attr_groups[] = {
+	&fabric_attr_group,
+	NULL,
+};
+
+static ssize_t fab_freeze_show(struct perf_object *pobj, char *buf)
+{
+	void __iomem *base = pobj->feature->ioaddr;
+	u64 v;
+
+	v = readq(base + FAB_CTRL);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n",
+			 (unsigned int)FIELD_GET(FAB_FREEZE_CNTR, v));
+}
+
+static ssize_t fab_freeze_store(struct perf_object *pobj,
+				const char *buf, size_t n)
+{
+	struct dfl_feature *feature = pobj->feature;
+	struct dfl_feature_platform_data *pdata;
+	void __iomem *base = feature->ioaddr;
+	bool state;
+	u64 v;
+
+	if (strtobool(buf, &state))
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&feature->pdev->dev);
+
+	mutex_lock(&pdata->lock);
+	v = readq(base + FAB_CTRL);
+	v &= ~FAB_FREEZE_CNTR;
+	v |= FIELD_PREP(FAB_FREEZE_CNTR, state ? 1 : 0);
+	writeq(v, base + FAB_CTRL);
+	mutex_unlock(&pdata->lock);
+
+	return n;
+}
+static PERF_OBJ_ATTR(fab_freeze, freeze, 0644,
+		     fab_freeze_show, fab_freeze_store);
+
+static struct attribute *fabric_top_attrs[] = {
+	&perf_obj_attr_fab_freeze.attr,
+	NULL,
+};
+
+static struct attribute_group fabric_top_attr_group = {
+	.attrs = fabric_top_attrs,
+};
+
+static const struct attribute_group *fabric_top_attr_groups[] = {
+	&fabric_attr_group,
+	&fabric_top_attr_group,
+	NULL,
+};
+
+static int create_perf_fabric_obj(struct perf_object *perf_dev)
+{
+	struct perf_object *pobj, *obj;
+	int i;
+
+	pobj = create_perf_obj(perf_dev->feature, &perf_dev->kobj,
+			       PERF_OBJ_ROOT_ID, fabric_top_attr_groups,
+			       "fabric");
+	if (IS_ERR(pobj))
+		return PTR_ERR(pobj);
+
+	list_add(&pobj->node, &perf_dev->children);
+
+	for (i = 0; i < PERF_MAX_PORT_NUM; i++) {
+		obj = create_perf_obj(perf_dev->feature, &pobj->kobj, i,
+				      fabric_attr_groups, "port");
+		if (IS_ERR(obj))
+			return PTR_ERR(obj);
+
+		list_add(&obj->node, &pobj->children);
+	}
+
+	return 0;
+}
+
+static int fme_perf_init(struct platform_device *pdev,
+			 struct dfl_feature *feature)
+{
+	struct perf_object *perf_dev;
+	int ret;
+
+	perf_dev = create_perf_dev(feature);
+	if (IS_ERR(perf_dev))
+		return PTR_ERR(perf_dev);
+
+	ret = create_perf_fabric_obj(perf_dev);
+	if (ret)
+		goto done;
+
+	if (feature->id == FME_FEATURE_ID_GLOBAL_IPERF) {
+		/*
+		 * Cache and IOMMU(VT-D) performance counters are not supported
+		 * on discreted solutions e.g. Intel Programmable Acceleration
+		 * Card based on PCIe.
+		 */
+		ret = create_perf_cache_obj(perf_dev);
+		if (ret)
+			goto done;
+
+		ret = create_perf_iommu_obj(perf_dev);
+		if (ret)
+			goto done;
+	}
+
+	feature->priv = perf_dev;
+	return 0;
+
+done:
+	destroy_perf_obj(perf_dev);
+	return ret;
+}
+
+static void fme_perf_uinit(struct platform_device *pdev,
+			   struct dfl_feature *feature)
+{
+	struct perf_object *perf_dev = feature->priv;
+
+	destroy_perf_obj(perf_dev);
+}
+
+const struct dfl_feature_id fme_perf_id_table[] = {
+	{.id = FME_FEATURE_ID_GLOBAL_IPERF,},
+	{.id = FME_FEATURE_ID_GLOBAL_DPERF,},
+	{0,}
+};
+
+const struct dfl_feature_ops fme_perf_ops = {
+	.init = fme_perf_init,
+	.uinit = fme_perf_uinit,
+};
diff --git a/drivers/fpga/dfl-fme.h b/drivers/fpga/dfl-fme.h
index 5fbe3f5..dc71048 100644
--- a/drivers/fpga/dfl-fme.h
+++ b/drivers/fpga/dfl-fme.h
@@ -39,5 +39,7 @@ struct dfl_fme {
 extern const struct dfl_feature_id fme_pr_mgmt_id_table[];
 extern const struct dfl_feature_ops fme_global_err_ops;
 extern const struct dfl_feature_id fme_global_err_id_table[];
+extern const struct dfl_feature_ops fme_perf_ops;
+extern const struct dfl_feature_id fme_perf_id_table[];
 
 #endif /* __DFL_FME_H */
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 65f91ef..637692a 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -507,6 +507,7 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo)
 		struct dfl_feature *feature = &pdata->features[index];
 
 		/* save resource information for each feature */
+		feature->pdev = fdev;
 		feature->id = finfo->fid;
 		feature->resource_index = index;
 		feature->ioaddr = finfo->ioaddr;
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 6c32080..bf23436 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -191,6 +191,7 @@ struct dfl_feature_driver {
 /**
  * struct dfl_feature - sub feature of the feature devices
  *
+ * @pdev: parent platform device.
  * @id: sub feature id.
  * @resource_index: each sub feature has one mmio resource for its registers.
  *		    this index is used to find its mmio resource from the
@@ -200,6 +201,7 @@ struct dfl_feature_driver {
  * @priv: priv data of this feature.
  */
 struct dfl_feature {
+	struct platform_device *pdev;
 	u64 id;
 	int resource_index;
 	void __iomem *ioaddr;
-- 
1.8.3.1