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The partition uses “Hypervisor Pipe OS Enablement Notification” system parameter token (value = 64) to enable / disable hvpipe in the hypervisor. Once hvpipe is enabled, the hypervisor notifies OS if the payload is pending for that partition from any source. This system parameter token takes 1 byte length of data with 1 = Enable and 0 = Disable. Enable hvpipe in the hypervisor with ibm,set-system-parameter RTAS after registering hvpipe event source interrupt. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Tested-by: Shashank MS <shashank.gowda@in.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250909084402.1488456-9-haren@linux.ibm.com
45 lines
1.6 KiB
C
45 lines
1.6 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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#define PAPR_SYSPARM_HVPIPE_ENABLE mk_papr_sysparm(64)
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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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