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
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ASM_POWERPC_PAPR_SYSPARM_H
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#define _ASM_POWERPC_PAPR_SYSPARM_H
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#include <uapi/asm/papr-sysparm.h>
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typedef struct {
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u32 token;
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} papr_sysparm_t;
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#define mk_papr_sysparm(x_) ((papr_sysparm_t){ .token = x_, })
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/*
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* Derived from the "Defined Parameters" table in PAPR 7.3.16 System
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* Parameters Option. Where the spec says "characteristics", we use
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* "attrs" in the symbolic names to keep them from getting too
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* unwieldy.
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*/
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#define PAPR_SYSPARM_SHARED_PROC_LPAR_ATTRS mk_papr_sysparm(20)
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#define PAPR_SYSPARM_PROC_MODULE_INFO mk_papr_sysparm(43)
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#define PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS mk_papr_sysparm(44)
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#define PAPR_SYSPARM_TLB_BLOCK_INVALIDATE_ATTRS mk_papr_sysparm(50)
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#define PAPR_SYSPARM_LPAR_NAME mk_papr_sysparm(55)
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/**
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* struct papr_sysparm_buf - RTAS work area layout for system parameter functions.
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*
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* This is the memory layout of the buffers passed to/from
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* ibm,get-system-parameter and ibm,set-system-parameter. It is
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* distinct from the papr_sysparm_io_block structure that is passed
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* between user space and the kernel.
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*/
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struct papr_sysparm_buf {
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__be16 len;
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u8 val[PAPR_SYSPARM_MAX_OUTPUT];
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};
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struct papr_sysparm_buf *papr_sysparm_buf_alloc(void);
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void papr_sysparm_buf_free(struct papr_sysparm_buf *buf);
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int papr_sysparm_set(papr_sysparm_t param, const struct papr_sysparm_buf *buf);
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int papr_sysparm_get(papr_sysparm_t param, struct papr_sysparm_buf *buf);
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#endif /* _ASM_POWERPC_PAPR_SYSPARM_H */
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