1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * lppaca.h
4 * Copyright (C) 2001  Mike Corrigan IBM Corporation
5 */
6#ifndef _ASM_POWERPC_LPPACA_H
7#define _ASM_POWERPC_LPPACA_H
8
9#ifdef __KERNEL__
10
11/*
12 * These definitions relate to hypervisors that only exist when using
13 * a server type processor
14 */
15#ifdef CONFIG_PPC_BOOK3S
16
17/*
18 * This control block contains the data that is shared between the
19 * hypervisor and the OS.
20 */
21#include <linux/cache.h>
22#include <linux/threads.h>
23#include <asm/types.h>
24#include <asm/mmu.h>
25#include <asm/firmware.h>
26#include <asm/paca.h>
27
28/*
29 * The lppaca is the "virtual processor area" registered with the hypervisor,
30 * H_REGISTER_VPA etc.
31 *
32 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
33 * aligned, and must not cross a 4kB boundary. Its size field must be at
34 * least 640 bytes (but may be more).
35 *
36 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
37 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
38 * this structure as the canonical 640 byte size.
39 */
40struct lppaca {
41	/* cacheline 1 contains read-only data */
42
43	__be32	desc;			/* Eye catcher 0xD397D781 */
44	__be16	size;			/* Size of this struct */
45	u8	reserved1[3];
46	u8	__old_status;		/* Old status, including shared proc */
47	u8	reserved3[14];
48	volatile __be32 dyn_hw_node_id;	/* Dynamic hardware node id */
49	volatile __be32 dyn_hw_proc_id;	/* Dynamic hardware proc id */
50	u8	reserved4[56];
51	volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
52					  /* associativity change counters */
53	u8	reserved5[32];
54
55	/* cacheline 2 contains local read-write data */
56
57	u8	reserved6[48];
58	u8	cede_latency_hint;
59	u8	ebb_regs_in_use;
60	u8	reserved7[6];
61	u8	dtl_enable_mask;	/* Dispatch Trace Log mask */
62	u8	donate_dedicated_cpu;	/* Donate dedicated CPU cycles */
63	u8	fpregs_in_use;
64	u8	pmcregs_in_use;
65	u8	reserved8[28];
66	__be64	wait_state_cycles;	/* Wait cycles for this proc */
67	u8	reserved9[28];
68	__be16	slb_count;		/* # of SLBs to maintain */
69	u8	idle;			/* Indicate OS is idle */
70	u8	vmxregs_in_use;
71
72	/* cacheline 3 is shared with other processors */
73
74	/*
75	 * This is the yield_count.  An "odd" value (low bit on) means that
76	 * the processor is yielded (either because of an OS yield or a
77	 * hypervisor preempt).  An even value implies that the processor is
78	 * currently executing.
79	 * NOTE: Even dedicated processor partitions can yield so this
80	 * field cannot be used to determine if we are shared or dedicated.
81	 */
82	volatile __be32 yield_count;
83	volatile __be32 dispersion_count; /* dispatch changed physical cpu */
84	volatile __be64 cmo_faults;	/* CMO page fault count */
85	volatile __be64 cmo_fault_time;	/* CMO page fault time */
86	u8	reserved10[64];		/* [S]PURR expropriated/donated */
87	volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */
88	volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */
89	volatile __be64 wait_ready_tb;	/* Total TB wait->ready */
90	u8	reserved11[16];
91
92	/* cacheline 4-5 */
93
94	__be32	page_ins;		/* CMO Hint - # page ins by OS */
95	u8	reserved12[148];
96	volatile __be64 dtl_idx;	/* Dispatch Trace Log head index */
97	u8	reserved13[96];
98} ____cacheline_aligned;
99
100#define lppaca_of(cpu)	(*paca_ptrs[cpu]->lppaca_ptr)
101
102/*
103 * We are using a non architected field to determine if a partition is
104 * shared or dedicated. This currently works on both KVM and PHYP, but
105 * we will have to transition to something better.
106 */
107#define LPPACA_OLD_SHARED_PROC		2
108
109#ifdef CONFIG_PPC_PSERIES
110/*
111 * All CPUs should have the same shared proc value, so directly access the PACA
112 * to avoid false positives from DEBUG_PREEMPT.
113 */
114static inline bool lppaca_shared_proc(void)
115{
116	struct lppaca *l = local_paca->lppaca_ptr;
117
118	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
119		return false;
120	return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
121}
122
123#define get_lppaca()	(get_paca()->lppaca_ptr)
124#endif
125
126/*
127 * SLB shadow buffer structure as defined in the PAPR.  The save_area
128 * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
129 * ESID is stored in the lower 64bits, then the VSID.
130 */
131struct slb_shadow {
132	__be32	persistent;		/* Number of persistent SLBs */
133	__be32	buffer_length;		/* Total shadow buffer length */
134	__be64	reserved;
135	struct	{
136		__be64     esid;
137		__be64	vsid;
138	} save_area[SLB_NUM_BOLTED];
139} ____cacheline_aligned;
140
141#endif /* CONFIG_PPC_BOOK3S */
142#endif /* __KERNEL__ */
143#endif /* _ASM_POWERPC_LPPACA_H */
144