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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>
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Documentation/ABI/testing/sysfs-class-fpga-region
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9
Documentation/ABI/testing/sysfs-class-fpga-region
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@ -0,0 +1,9 @@
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What: /sys/class/fpga_region/<region>/compat_id
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Date: June 2018
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KernelVersion: 4.19
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Contact: Wu Hao <hao.wu@intel.com>
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Description: FPGA region id for compatibility check, e.g. compatibility
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of the FPGA reconfiguration hardware and image. This value
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is defined or calculated by the layer that is creating the
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FPGA region. This interface returns the compat_id value or
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just error code -ENOENT in case compat_id is not used.
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@ -158,6 +158,27 @@ int fpga_region_program_fpga(struct fpga_region *region)
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}
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EXPORT_SYMBOL_GPL(fpga_region_program_fpga);
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static ssize_t compat_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fpga_region *region = to_fpga_region(dev);
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if (!region->compat_id)
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return -ENOENT;
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return sprintf(buf, "%016llx%016llx\n",
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(unsigned long long)region->compat_id->id_h,
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(unsigned long long)region->compat_id->id_l);
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}
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static DEVICE_ATTR_RO(compat_id);
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static struct attribute *fpga_region_attrs[] = {
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&dev_attr_compat_id.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(fpga_region);
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/**
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* fpga_region_create - alloc and init a struct fpga_region
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* @dev: device parent
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@ -258,6 +279,7 @@ static int __init fpga_region_init(void)
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if (IS_ERR(fpga_region_class))
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return PTR_ERR(fpga_region_class);
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fpga_region_class->dev_groups = fpga_region_groups;
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fpga_region_class->dev_release = fpga_region_dev_release;
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return 0;
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@ -14,6 +14,7 @@
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* @bridge_list: list of FPGA bridges specified in region
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* @mgr: FPGA manager
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* @info: FPGA image info
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* @compat_id: FPGA region id for compatibility check.
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* @priv: private data
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* @get_bridges: optional function to get bridges to a list
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*/
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@ -23,6 +24,7 @@ struct fpga_region {
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struct list_head bridge_list;
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struct fpga_manager *mgr;
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struct fpga_image_info *info;
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struct fpga_compat_id *compat_id;
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void *priv;
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int (*get_bridges)(struct fpga_region *region);
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};
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