[PATCH v3 11/21] fpga: dfl: fme: add header sub feature support
From: Wu Hao <hidden>
Date: 2017-11-27 06:55:42
Also in:
linux-fpga, lkml
Subsystem:
fpga dfl drivers, fpga manager framework, the rest · Maintainers:
Xu Yilun, Moritz Fischer, Linus Torvalds
From: Kang Luwei <redacted>
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 <redacted>
Signed-off-by: Enno Luebbers <redacted>
Signed-off-by: Shiva Rao <redacted>
Signed-off-by: Christopher Rauer <redacted>
Signed-off-by: Kang Luwei <redacted>
Signed-off-by: Xiao Guangrong <redacted>
Signed-off-by: Wu Hao <redacted>
----
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