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Subject[PATCH v3 11/21] fpga: dfl: fme: add header sub feature support
Date
From: Kang Luwei <luwei.kang@intel.com>

The header register set is always present for FPGA Management Engine (FME),
this patch implements init and uinit function for header sub feature and
introduce several read-only sysfs interfaces for the capability and status.

Sysfs interfaces:
* /sys/class/fpga_region/<regionX>/<fpga-dfl-fme.x>/ports_num
Read-only. Number of ports implemented

* /sys/class/fpga_region/<regionX>/<fpga-dfl-fme.x>/bitstream_id
Read-only. Blue Bitstream (static FPGA region) identifier number

* /sys/class/fpga_region/<regionX>/<fpga-dfl-fme.x>/bitstream_metadata
Read-only. Blue Bitstream (static FPGA region) meta data

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Kang Luwei <luwei.kang@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
----
v2: add sysfs documentation
v3: rename driver to fpga-dfl-fme.
improve sysfs doc and commit description.
replace bitfield.
---
.../ABI/testing/sysfs-platform-fpga-dfl-fme | 21 ++++++++
drivers/fpga/dfl-fme-main.c | 60 ++++++++++++++++++++++
2 files changed, 81 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme

diff --git a/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme b/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme
new file mode 100644
index 0000000..6b32799
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme
@@ -0,0 +1,21 @@
+What: /sys/bus/platform/devices/fpga-dfl-fme.0/ports_num
+Date: November 2017
+KernelVersion: 4.15
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read-only. One DFL FPGA device may have more than 1
+ port/Accelerator Function Unit (AFU). It returns the
+ number of ports on the FPGA device when read it.
+
+What: /sys/bus/platform/devices/fpga-dfl-fme.0/bitstream_id
+Date: November 2017
+KernelVersion: 4.15
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read-only. It returns Blue Bitstream (static FPGA region)
+ identifier number.
+
+What: /sys/bus/platform/devices/fpga-dfl-fme.0/bitstream_meta
+Date: November 2017
+KernelVersion: 4.15
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read-only. It returns Blue Bitstream (static FPGA region)
+ meta data.
diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c
index f7b5f7d..d17c66a 100644
--- a/drivers/fpga/dfl-fme-main.c
+++ b/drivers/fpga/dfl-fme-main.c
@@ -21,9 +21,68 @@

#include "fpga-dfl.h"

+static ssize_t ports_num_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ void __iomem *base;
+ u64 v;
+
+ base = get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+
+ v = readq(base + FME_HDR_CAP);
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n",
+ (unsigned int)FIELD_GET(FME_CAP_NUM_PORTS, v));
+}
+static DEVICE_ATTR_RO(ports_num);
+
+static ssize_t bitstream_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ void __iomem *base;
+ u64 v;
+
+ base = get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+
+ v = readq(base + FME_HDR_BITSTREAM_ID);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)v);
+}
+static DEVICE_ATTR_RO(bitstream_id);
+
+static ssize_t bitstream_metadata_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ void __iomem *base;
+ u64 v;
+
+ base = get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+
+ v = readq(base + FME_HDR_BITSTREAM_MD);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%llx\n", (unsigned long long)v);
+}
+static DEVICE_ATTR_RO(bitstream_metadata);
+
+static const struct attribute *fme_hdr_attrs[] = {
+ &dev_attr_ports_num.attr,
+ &dev_attr_bitstream_id.attr,
+ &dev_attr_bitstream_metadata.attr,
+ NULL,
+};
+
static int fme_hdr_init(struct platform_device *pdev, struct feature *feature)
{
+ void __iomem *base = feature->ioaddr;
+ int ret;
+
dev_dbg(&pdev->dev, "FME HDR Init.\n");
+ dev_dbg(&pdev->dev, "FME cap %llx.\n",
+ (unsigned long long)readq(base + FME_HDR_CAP));
+
+ ret = sysfs_create_files(&pdev->dev.kobj, fme_hdr_attrs);
+ if (ret)
+ return ret;

return 0;
}
@@ -31,6 +90,7 @@ static int fme_hdr_init(struct platform_device *pdev, struct feature *feature)
static void fme_hdr_uinit(struct platform_device *pdev, struct feature *feature)
{
dev_dbg(&pdev->dev, "FME HDR UInit.\n");
+ sysfs_remove_files(&pdev->dev.kobj, fme_hdr_attrs);
}

static const struct feature_ops fme_hdr_ops = {
--
1.8.3.1
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