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fpga: dfl: fme: add capability sysfs interfaces

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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: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Link: https://lore.kernel.org/r/1564914022-3710-11-git-send-email-hao.wu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wu Hao 2019-08-04 18:20:20 +08:00 committed by Greg Kroah-Hartman
parent 3c51ff7722
commit 52eb6d31a1
2 changed files with 71 additions and 0 deletions
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23
Documentation/ABI/testing/sysfs-platform-dfl-fme
View File

@ -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.

48
drivers/fpga/dfl-fme-main.c
View File

@ -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);