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2e4986cf2d
Create the class, character device and functions for a fwctl driver to un/register to the subsystem. A typical fwctl driver has a sysfs presence like: $ ls -l /dev/fwctl/fwctl0 crw------- 1 root root 250, 0 Apr 25 19:16 /dev/fwctl/fwctl0 $ ls /sys/class/fwctl/fwctl0 dev device power subsystem uevent $ ls /sys/class/fwctl/fwctl0/device/infiniband/ ibp0s10f0 $ ls /sys/class/infiniband/ibp0s10f0/device/fwctl/ fwctl0/ $ ls /sys/devices/pci0000:00/0000:00:0a.0/fwctl/fwctl0 dev device power subsystem uevent Which allows userspace to link all the multi-subsystem driver components together and learn the subsystem specific names for the device's components. Link: https://patch.msgid.link/r/1-v5-642aa0c94070+4447f-fwctl_jgg@nvidia.com Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Shannon Nelson <shannon.nelson@amd.com> Tested-by: Dave Jiang <dave.jiang@intel.com> Tested-by: Shannon Nelson <shannon.nelson@amd.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
10 lines
443 B
Plaintext
10 lines
443 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menuconfig FWCTL
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tristate "fwctl device firmware access framework"
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help
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fwctl provides a userspace API for restricted access to communicate
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with on-device firmware. The communication channel is intended to
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support a wide range of lockdown compatible device behaviors including
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manipulating device FLASH, debugging, and other activities that don't
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fit neatly into an existing subsystem.
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