Commit 52eb6d31 authored by Wu Hao's avatar Wu Hao Committed by Greg Kroah-Hartman
Browse files

fpga: dfl: fme: add capability sysfs interfaces 



This patch adds 3 read-only sysfs interfaces for FPGA Management Engine
(FME) block for capabilities including cache_size, fabric_version and
socket_id.

Signed-off-by: default avatarLuwei Kang <luwei.kang@intel.com>
Signed-off-by: default avatarXu Yilun <yilun.xu@intel.com>
Signed-off-by: default avatarWu Hao <hao.wu@intel.com>
Acked-by: default avatarAlan Tull <atull@kernel.org>
Signed-off-by: default avatarMoritz Fischer <mdf@kernel.org>
Link: https://lore.kernel.org/r/1564914022-3710-11-git-send-email-hao.wu@intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3c51ff77

Documentation/ABI/testing/sysfs-platform-dfl-fme

+23 −0
Original line number Diff line number Diff line
@@ -21,3 +21,26 @@ Contact: Wu Hao <hao.wu@intel.com> 
Description:	Read-only. It returns Bitstream (static FPGA region) meta

		data, which includes the synthesis date, seed and other

		information of this static FPGA region.



What:		/sys/bus/platform/devices/dfl-fme.0/cache_size

Date:		August 2019

KernelVersion:  5.4

Contact:	Wu Hao <hao.wu@intel.com>

Description:	Read-only. It returns cache size of this FPGA device.



What:		/sys/bus/platform/devices/dfl-fme.0/fabric_version

Date:		August 2019

KernelVersion:  5.4

Contact:	Wu Hao <hao.wu@intel.com>

Description:	Read-only. It returns fabric version of this FPGA device.

		Userspace applications need this information to select

		best data channels per different fabric design.



What:		/sys/bus/platform/devices/dfl-fme.0/socket_id

Date:		August 2019

KernelVersion:  5.4

Contact:	Wu Hao <hao.wu@intel.com>

Description:	Read-only. It returns socket_id to indicate which socket

		this FPGA belongs to, only valid for integrated solution.

		User only needs this information, in case standard numa node

		can't provide correct information.

drivers/fpga/dfl-fme-main.c

+48 −0
Original line number Diff line number Diff line
@@ -73,10 +73,58 @@ static ssize_t bitstream_metadata_show(struct device *dev, 
}

static DEVICE_ATTR_RO(bitstream_metadata);



static ssize_t cache_size_show(struct device *dev,

			       struct device_attribute *attr, char *buf)

{

	void __iomem *base;

	u64 v;



	base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_HEADER);



	v = readq(base + FME_HDR_CAP);



	return sprintf(buf, "%u\n",

		       (unsigned int)FIELD_GET(FME_CAP_CACHE_SIZE, v));

}

static DEVICE_ATTR_RO(cache_size);



static ssize_t fabric_version_show(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	void __iomem *base;

	u64 v;



	base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_HEADER);



	v = readq(base + FME_HDR_CAP);



	return sprintf(buf, "%u\n",

		       (unsigned int)FIELD_GET(FME_CAP_FABRIC_VERID, v));

}

static DEVICE_ATTR_RO(fabric_version);



static ssize_t socket_id_show(struct device *dev,

			      struct device_attribute *attr, char *buf)

{

	void __iomem *base;

	u64 v;



	base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_HEADER);



	v = readq(base + FME_HDR_CAP);



	return sprintf(buf, "%u\n",

		       (unsigned int)FIELD_GET(FME_CAP_SOCKET_ID, v));

}

static DEVICE_ATTR_RO(socket_id);



static struct attribute *fme_hdr_attrs[] = {

	&dev_attr_ports_num.attr,

	&dev_attr_bitstream_id.attr,

	&dev_attr_bitstream_metadata.attr,

	&dev_attr_cache_size.attr,

	&dev_attr_fabric_version.attr,

	&dev_attr_socket_id.attr,

	NULL,

};

ATTRIBUTE_GROUPS(fme_hdr);

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