Re: [PATCH v2 18/18] fpga: dfl: fme: add performance reporting support

From: Wu Hao
Date: Fri May 17 2019 - 00:07:40 EST

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In reply to: Alan Tull: "Re: [PATCH v2 18/18] fpga: dfl: fme: add performance reporting support"
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On Thu, May 16, 2019 at 12:28:08PM -0500, Alan Tull wrote:
> On Mon, Apr 29, 2019 at 4:13 AM Wu Hao <hao.wu@xxxxxxxxx> wrote:
>
> Hi Hao,
>
> >
> > 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@xxxxxxxxx>
> > Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx>
> > Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
> > ---
> > 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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +Description: Read-Only. Read 'fabric' category performance counters:
> > + pcie0_read, pcie0_write, pcie1_read, pcie1_write,
> > + upi_read, upi_write and mmio_read.
>
> Also mmio_write

Thanks for the comments, will fix it.

>
> > +
> > +What: /sys/bus/platform/devices/dfl-fme.0/perf/fabric/enable
> > +Date: April 2019
> > +KernelVersion: 5.2
> > +Contact: Wu Hao <hao.wu@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > +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@xxxxxxxxx>
> > + * Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
> > + * Wu Hao <hao.wu@xxxxxxxxx>
> > + * Joseph Grecco <joe.grecco@xxxxxxxxx>
> > + * Enno Luebbers <enno.luebbers@xxxxxxxxx>
> > + * Tim Whisonant <tim.whisonant@xxxxxxxxx>
> > + * Ananda Ravuri <ananda.ravuri@xxxxxxxxx>
> > + * Mitchel, Henry <henry.mitchel@xxxxxxxxx>
> > + */
> > +
> > +#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)
>
> This #define and the ones below set up an interdependency with sysfs.h
> that I'm scratching my head about. You're defining your own type of
> attribute struct which is fine, but counting on __ATTR to continue to
> work with it in the future. It wouldn't be much of a change here to
> define your own macro here (which is the same as __ATTR) and then use
> it for your PERF_OBJ_ATTR_RW, etc. Maybe I'm being overcautious, but
> it's a small change.

Sure, I can change it in the next version.

>
> > +
> > +#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;
>
> Would this be -EPERM?

Actually i use the same error code as other code in drivers/base/core.c.

>
> > +
> > + if (attr->show)
> > + ret = attr->show(pobj, buf);
>
> Actually is it even possible for !attr->show if this were a WO attribute?

It's possible, but i think if this is a WO attribute, you may get -EPERM
directly when trying to open it for Read, and this show function should
not be invoked at all.

>
> > + 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;
>
> Same here
>
> > +
> > + 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);
>
> kobject_put will delete and clean up, you won't need kobject_del.

Will fix this, kobject_put should be enough.

>
> > +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));
>
> It's fine to use sprintf, as mentioned recently on one of the other patches.

Sure, will fix this.

>
> > +}
> > +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);
>
> The attributes should be removed before anything else goes away.

Sure.

>
> > + 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;
>
> This would only happen if there was a coding error using one of the
> macros below, right?

Yes. So WARN should be better instead -EINVAL. Let me fix this.

>
> > +
> > + 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);
>
> PERF_OBJ_ATTR_RW ? Also in a few other places, wherever '0644' shows up.

PERF_OBJ_ATTR is used as it can define its own file name.
Let me see if we can improve this in the next version.

Thanks for the review!

Hao

>
>
> > +
> > +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
> >

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