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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / arch / powerpc / include / asm / lppaca.h
blob: d0a2a2f9956471362e13093272955f42c0e4121b [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]1/*
2 * lppaca.h
3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#ifndef _ASM_POWERPC_LPPACA_H
20#define _ASM_POWERPC_LPPACA_H
21#ifdef __KERNEL__
22
23/*
24 * These definitions relate to hypervisors that only exist when using
25 * a server type processor
26 */
27#ifdef CONFIG_PPC_BOOK3S
28
29/*
30 * This control block contains the data that is shared between the
31 * hypervisor and the OS.
32 */
33#include <linux/cache.h>
34#include <linux/threads.h>
35#include <asm/types.h>
36#include <asm/mmu.h>
37
38/*
39 * We only have to have statically allocated lppaca structs on
40 * legacy iSeries, which supports at most 64 cpus.
41 */
42#define NR_LPPACAS 1
43
44/*
45 * The Hypervisor barfs if the lppaca crosses a page boundary. A 1k
46 * alignment is sufficient to prevent this
47 */
48struct lppaca {
49 /* cacheline 1 contains read-only data */
50
51 __be32 desc; /* Eye catcher 0xD397D781 */
52 __be16 size; /* Size of this struct */
53 u8 reserved1[3];
54 u8 __old_status; /* Old status, including shared proc */
55 u8 reserved3[14];
56 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
57 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
58 u8 reserved4[56];
59 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
60 /* associativity change counters */
61 u8 reserved5[32];
62
63 /* cacheline 2 contains local read-write data */
64
65 u8 reserved6[48];
66 u8 cede_latency_hint;
67 u8 ebb_regs_in_use;
68 u8 reserved7[6];
69 u8 dtl_enable_mask; /* Dispatch Trace Log mask */
70 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
71 u8 fpregs_in_use;
72 u8 pmcregs_in_use;
73 u8 reserved8[28];
74 __be64 wait_state_cycles; /* Wait cycles for this proc */
75 u8 reserved9[28];
76 __be16 slb_count; /* # of SLBs to maintain */
77 u8 idle; /* Indicate OS is idle */
78 u8 vmxregs_in_use;
79
80 /* cacheline 3 is shared with other processors */
81
82 /*
83 * This is the yield_count. An "odd" value (low bit on) means that
84 * the processor is yielded (either because of an OS yield or a
85 * hypervisor preempt). An even value implies that the processor is
86 * currently executing.
87 * NOTE: Even dedicated processor partitions can yield so this
88 * field cannot be used to determine if we are shared or dedicated.
89 */
90 volatile __be32 yield_count;
91 volatile __be32 dispersion_count; /* dispatch changed physical cpu */
92 volatile __be64 cmo_faults; /* CMO page fault count */
93 volatile __be64 cmo_fault_time; /* CMO page fault time */
94 u8 reserved10[104];
95
96 /* cacheline 4-5 */
97
98 __be32 page_ins; /* CMO Hint - # page ins by OS */
99 u8 reserved11[148];
100 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
101 u8 reserved12[96];
102} __attribute__((__aligned__(0x400)));
103
104extern struct lppaca lppaca[];
105
106#define lppaca_of(cpu) (*paca[cpu].lppaca_ptr)
107
108/*
109 * We are using a non architected field to determine if a partition is
110 * shared or dedicated. This currently works on both KVM and PHYP, but
111 * we will have to transition to something better.
112 */
113#define LPPACA_OLD_SHARED_PROC 2
114
115static inline bool lppaca_shared_proc(struct lppaca *l)
116{
117 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
118}
119
120/*
121 * SLB shadow buffer structure as defined in the PAPR. The save_area
122 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
123 * ESID is stored in the lower 64bits, then the VSID.
124 */
125struct slb_shadow {
126 __be32 persistent; /* Number of persistent SLBs */
127 __be32 buffer_length; /* Total shadow buffer length */
128 __be64 reserved;
129 struct {
130 __be64 esid;
131 __be64 vsid;
132 } save_area[SLB_NUM_BOLTED];
133} ____cacheline_aligned;
134
135/*
136 * Layout of entries in the hypervisor's dispatch trace log buffer.
137 */
138struct dtl_entry {
139 u8 dispatch_reason;
140 u8 preempt_reason;
141 __be16 processor_id;
142 __be32 enqueue_to_dispatch_time;
143 __be32 ready_to_enqueue_time;
144 __be32 waiting_to_ready_time;
145 __be64 timebase;
146 __be64 fault_addr;
147 __be64 srr0;
148 __be64 srr1;
149};
150
151#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
152#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
153
154extern struct kmem_cache *dtl_cache;
155
156/*
157 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
158 * reading from the dispatch trace log. If other code wants to consume
159 * DTL entries, it can set this pointer to a function that will get
160 * called once for each DTL entry that gets processed.
161 */
162extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
163
164#endif /* CONFIG_PPC_BOOK3S */
165#endif /* __KERNEL__ */
166#endif /* _ASM_POWERPC_LPPACA_H */