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fwctl: FWCTL_INFO to return basic information about the device

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Userspace will need to know some details about the fwctl interface being
used to locate the correct userspace code to communicate with the
kernel. Provide a simple device_type enum indicating what the kernel
driver is.

Allow the device to provide a device specific info struct that contains
any additional information that the driver may need to provide to
userspace.

Link: https://patch.msgid.link/r/3-v5-642aa0c94070+4447f-fwctl_jgg@nvidia.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.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>
This commit is contained in:
Jason Gunthorpe
2025-02-27 20:26:31 -04:00
parent 0e79a47fb1
commit fb39e9092b
3 changed files with 98 additions and 0 deletions
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31
include/uapi/fwctl/fwctl.h
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@@ -4,6 +4,9 @@
#ifndef _UAPI_FWCTL_H
#define _UAPI_FWCTL_H
#include <linux/types.h>
#include <linux/ioctl.h>
#define FWCTL_TYPE 0x9A
/**
@@ -33,6 +36,34 @@
*/
enum {
FWCTL_CMD_BASE = 0,
FWCTL_CMD_INFO = 0,
};
enum fwctl_device_type {
FWCTL_DEVICE_TYPE_ERROR = 0,
};
/**
* struct fwctl_info - ioctl(FWCTL_INFO)
* @size: sizeof(struct fwctl_info)
* @flags: Must be 0
* @out_device_type: Returns the type of the device from enum fwctl_device_type
* @device_data_len: On input the length of the out_device_data memory. On
* output the size of the kernel's device_data which may be larger or
* smaller than the input. Maybe 0 on input.
* @out_device_data: Pointer to a memory of device_data_len bytes. Kernel will
* fill the entire memory, zeroing as required.
*
* Returns basic information about this fwctl instance, particularly what driver
* is being used to define the device_data format.
*/
struct fwctl_info {
__u32 size;
__u32 flags;
__u32 out_device_type;
__u32 device_data_len;
__aligned_u64 out_device_data;
};
#define FWCTL_INFO _IO(FWCTL_TYPE, FWCTL_CMD_INFO)
#endif