8ded03ae48
Some PAPR system parameter values are formatted by firmware as
nul-terminated strings (e.g. LPAR name, shared processor attributes).
But the values returned for other parameters, such as processor module
info and TLB block invalidate characteristics, are binary data with
parameter-specific layouts. So char[] isn't the appropriate type for
the general case. Use u8/__u8.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Fixes: 905b9e4878 ("powerpc/pseries/papr-sysparm: Expose character device to user space")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240202-papr-sysparm-ioblock-data-use-u8-v1-1-f5c6c89f65ec@linux.ibm.com
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_PAPR_SYSPARM_H_
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#define _UAPI_PAPR_SYSPARM_H_
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#include <linux/types.h>
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#include <asm/ioctl.h>
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#include <asm/papr-miscdev.h>
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enum {
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PAPR_SYSPARM_MAX_INPUT = 1024,
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PAPR_SYSPARM_MAX_OUTPUT = 4000,
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};
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struct papr_sysparm_io_block {
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__u32 parameter;
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__u16 length;
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__u8 data[PAPR_SYSPARM_MAX_OUTPUT];
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};
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/**
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* PAPR_SYSPARM_IOC_GET - Retrieve the value of a PAPR system parameter.
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*
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* Uses _IOWR because of one corner case: Retrieving the value of the
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* "OS Service Entitlement Status" parameter (60) requires the caller
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* to supply input data (a date string) in the buffer passed to
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* firmware. So the @length and @data of the incoming
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* papr_sysparm_io_block are always used to initialize the work area
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* supplied to ibm,get-system-parameter. No other parameters are known
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* to parameterize the result this way, and callers are encouraged
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* (but not required) to zero-initialize @length and @data in the
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* common case.
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*
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* On error the contents of the ioblock are indeterminate.
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*
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* Return:
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* 0: Success; @length is the length of valid data in @data, not to exceed @PAPR_SYSPARM_MAX_OUTPUT.
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* -EIO: Platform error. (-1)
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* -EINVAL: Incorrect data length or format. (-9999)
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* -EPERM: The calling partition is not allowed to access this parameter. (-9002)
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* -EOPNOTSUPP: Parameter not supported on this platform (-3)
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*/
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#define PAPR_SYSPARM_IOC_GET _IOWR(PAPR_MISCDEV_IOC_ID, 1, struct papr_sysparm_io_block)
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/**
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* PAPR_SYSPARM_IOC_SET - Update the value of a PAPR system parameter.
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*
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* The contents of the ioblock are unchanged regardless of success.
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*
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* Return:
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* 0: Success; the parameter has been updated.
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* -EIO: Platform error. (-1)
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* -EINVAL: Incorrect data length or format. (-9999)
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* -EPERM: The calling partition is not allowed to access this parameter. (-9002)
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* -EOPNOTSUPP: Parameter not supported on this platform (-3)
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*/
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#define PAPR_SYSPARM_IOC_SET _IOW(PAPR_MISCDEV_IOC_ID, 2, struct papr_sysparm_io_block)
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#endif /* _UAPI_PAPR_SYSPARM_H_ */
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