| From d05c229ff779cce9a05db05c3fa4c74e72f75590 Mon Sep 17 00:00:00 2001 |
| From: Wu Hao <hao.wu@intel.com> |
| Date: Sat, 30 Jun 2018 08:53:12 +0800 |
| Subject: [PATCH 1706/1795] fpga: region: add compat_id support |
| |
| This patch introduces a compat_id pointer member and sysfs interface |
| for each fpga region, similar as compat_id for fpga manager, it allows |
| applications to read the per region compat_id for compatibility |
| checking before other actions on this fpga-region (e.g. PR). |
| |
| Signed-off-by: Wu Hao <hao.wu@intel.com> |
| Acked-by: Alan Tull <atull@kernel.org> |
| Acked-by: Moritz Fischer <mdf@kernel.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| (cherry picked from commit 41a8b2c56470b7e4e3e2db93324d50bbbf60cdc4) |
| Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> |
| --- |
| .../ABI/testing/sysfs-class-fpga-region | 9 ++++++++ |
| drivers/fpga/fpga-region.c | 22 +++++++++++++++++++ |
| include/linux/fpga/fpga-region.h | 2 ++ |
| 3 files changed, 33 insertions(+) |
| create mode 100644 Documentation/ABI/testing/sysfs-class-fpga-region |
| |
| diff --git a/Documentation/ABI/testing/sysfs-class-fpga-region b/Documentation/ABI/testing/sysfs-class-fpga-region |
| new file mode 100644 |
| index 000000000000..bc7ec644acc9 |
| --- /dev/null |
| +++ b/Documentation/ABI/testing/sysfs-class-fpga-region |
| @@ -0,0 +1,9 @@ |
| +What: /sys/class/fpga_region/<region>/compat_id |
| +Date: June 2018 |
| +KernelVersion: 4.19 |
| +Contact: Wu Hao <hao.wu@intel.com> |
| +Description: FPGA region id for compatibility check, e.g. compatibility |
| + of the FPGA reconfiguration hardware and image. This value |
| + is defined or calculated by the layer that is creating the |
| + FPGA region. This interface returns the compat_id value or |
| + just error code -ENOENT in case compat_id is not used. |
| diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c |
| index 6d214d75c7be..0d65220d5ec5 100644 |
| --- a/drivers/fpga/fpga-region.c |
| +++ b/drivers/fpga/fpga-region.c |
| @@ -158,6 +158,27 @@ int fpga_region_program_fpga(struct fpga_region *region) |
| } |
| EXPORT_SYMBOL_GPL(fpga_region_program_fpga); |
| |
| +static ssize_t compat_id_show(struct device *dev, |
| + struct device_attribute *attr, char *buf) |
| +{ |
| + struct fpga_region *region = to_fpga_region(dev); |
| + |
| + if (!region->compat_id) |
| + return -ENOENT; |
| + |
| + return sprintf(buf, "%016llx%016llx\n", |
| + (unsigned long long)region->compat_id->id_h, |
| + (unsigned long long)region->compat_id->id_l); |
| +} |
| + |
| +static DEVICE_ATTR_RO(compat_id); |
| + |
| +static struct attribute *fpga_region_attrs[] = { |
| + &dev_attr_compat_id.attr, |
| + NULL, |
| +}; |
| +ATTRIBUTE_GROUPS(fpga_region); |
| + |
| /** |
| * fpga_region_create - alloc and init a struct fpga_region |
| * @dev: device parent |
| @@ -258,6 +279,7 @@ static int __init fpga_region_init(void) |
| if (IS_ERR(fpga_region_class)) |
| return PTR_ERR(fpga_region_class); |
| |
| + fpga_region_class->dev_groups = fpga_region_groups; |
| fpga_region_class->dev_release = fpga_region_dev_release; |
| |
| return 0; |
| diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h |
| index d7071cddd727..0521b7f577a4 100644 |
| --- a/include/linux/fpga/fpga-region.h |
| +++ b/include/linux/fpga/fpga-region.h |
| @@ -14,6 +14,7 @@ |
| * @bridge_list: list of FPGA bridges specified in region |
| * @mgr: FPGA manager |
| * @info: FPGA image info |
| + * @compat_id: FPGA region id for compatibility check. |
| * @priv: private data |
| * @get_bridges: optional function to get bridges to a list |
| */ |
| @@ -23,6 +24,7 @@ struct fpga_region { |
| struct list_head bridge_list; |
| struct fpga_manager *mgr; |
| struct fpga_image_info *info; |
| + struct fpga_compat_id *compat_id; |
| void *priv; |
| int (*get_bridges)(struct fpga_region *region); |
| }; |
| -- |
| 2.19.0 |
| |