linux-kernel - [PATCH v2 14/18] fpga: dfl: fme: add capability sysfs interfaces

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Date:   Mon, 29 Apr 2019 16:55:47 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     atull@...nel.org, mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-api@...r.kernel.org, Wu Hao <hao.wu@...el.com>,
        Luwei Kang <luwei.kang@...el.com>,
        Xu Yilun <yilun.xu@...el.com>
Subject: [PATCH v2 14/18] 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: Luwei Kang <luwei.kang@...el.com>
Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Alan Tull <atull@...nel.org>
---
 Documentation/ABI/testing/sysfs-platform-dfl-fme | 23 ++++++++++++
 drivers/fpga/dfl-fme-main.c                      | 48 ++++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-platform-dfl-fme b/Documentation/ABI/testing/sysfs-platform-dfl-fme
index 8fa4feb..d1aa375 100644
--- a/Documentation/ABI/testing/sysfs-platform-dfl-fme
+++ b/Documentation/ABI/testing/sysfs-platform-dfl-fme
@@ -21,3 +21,26 @@ Contact:	Wu Hao <hao.wu@...el.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:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@...el.com>
+Description:	Read-only. It returns cache size of this FPGA device.
+
+What:		/sys/bus/platform/devices/dfl-fme.0/fabric_version
+Date:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@...el.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:		April 2019
+KernelVersion:  5.2
+Contact:	Wu Hao <hao.wu@...el.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.
diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
index 38c6342..8339ee8 100644
--- a/drivers/fpga/dfl-fme-main.c
+++ b/drivers/fpga/dfl-fme-main.c
@@ -75,10 +75,58 @@ 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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%u\n",
+			 (unsigned int)FIELD_GET(FME_CAP_SOCKET_ID, v));
+}
+static DEVICE_ATTR_RO(socket_id);
+
 static const 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,
 };
 
-- 
1.8.3.1