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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_PAPR_SYSPARM_H_
#define _UAPI_PAPR_SYSPARM_H_
#include <linux/types.h>
#include <asm/ioctl.h>
#include <asm/papr-miscdev.h>
enum {
PAPR_SYSPARM_MAX_INPUT = 1024,
PAPR_SYSPARM_MAX_OUTPUT = 4000,
};
struct papr_sysparm_io_block {
__u32 parameter;
__u16 length;
char data[PAPR_SYSPARM_MAX_OUTPUT];
};
/**
* PAPR_SYSPARM_IOC_GET - Retrieve the value of a PAPR system parameter.
*
* Uses _IOWR because of one corner case: Retrieving the value of the
* "OS Service Entitlement Status" parameter (60) requires the caller
* to supply input data (a date string) in the buffer passed to
* firmware. So the @length and @data of the incoming
* papr_sysparm_io_block are always used to initialize the work area
* supplied to ibm,get-system-parameter. No other parameters are known
* to parameterize the result this way, and callers are encouraged
* (but not required) to zero-initialize @length and @data in the
* common case.
*
* On error the contents of the ioblock are indeterminate.
*
* Return:
* 0: Success; @length is the length of valid data in @data, not to exceed @PAPR_SYSPARM_MAX_OUTPUT.
* -EIO: Platform error. (-1)
* -EINVAL: Incorrect data length or format. (-9999)
* -EPERM: The calling partition is not allowed to access this parameter. (-9002)
* -EOPNOTSUPP: Parameter not supported on this platform (-3)
*/
#define PAPR_SYSPARM_IOC_GET _IOWR(PAPR_MISCDEV_IOC_ID, 1, struct papr_sysparm_io_block)
/**
* PAPR_SYSPARM_IOC_SET - Update the value of a PAPR system parameter.
*
* The contents of the ioblock are unchanged regardless of success.
*
* Return:
* 0: Success; the parameter has been updated.
* -EIO: Platform error. (-1)
* -EINVAL: Incorrect data length or format. (-9999)
* -EPERM: The calling partition is not allowed to access this parameter. (-9002)
* -EOPNOTSUPP: Parameter not supported on this platform (-3)
*/
#define PAPR_SYSPARM_IOC_SET _IOW(PAPR_MISCDEV_IOC_ID, 2, struct papr_sysparm_io_block)
#endif /* _UAPI_PAPR_SYSPARM_H_ */
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