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fpga: region: add compat_id support

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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>
This commit is contained in:
Wu Hao 2018-06-30 08:53:12 +08:00 committed by Greg Kroah-Hartman
parent 99a560bde3
commit 41a8b2c564
3 changed files with 33 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-class-fpga-region Normal file
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@ -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.

22
drivers/fpga/fpga-region.c
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@ -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;

2
include/linux/fpga/fpga-region.h
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@ -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);
};