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 #include <asm/firmware.h>
38
39 /*
40 * The lppaca is the "virtual processor area" registered with the hypervisor,
41 * H_REGISTER_VPA etc.
42 *
43 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
44 * aligned, and must not cross a 4kB boundary. Its size field must be at
45 * least 640 bytes (but may be more).
46 *
47 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
48 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
49 * this structure as the canonical 640 byte size.
50 */
51 struct lppaca {
52 /* cacheline 1 contains read-only data */
53
54 __be32 desc; /* Eye catcher 0xD397D781 */
55 __be16 size; /* Size of this struct */
56 u8 reserved1[3];
57 u8 __old_status; /* Old status, including shared proc */
58 u8 reserved3[14];
59 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
60 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
61 u8 reserved4[56];
62 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
63 /* associativity change counters */
64 u8 reserved5[32];
65
66 /* cacheline 2 contains local read-write data */
67
68 u8 reserved6[48];
69 u8 cede_latency_hint;
70 u8 ebb_regs_in_use;
71 u8 reserved7[6];
72 u8 dtl_enable_mask; /* Dispatch Trace Log mask */
73 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
74 u8 fpregs_in_use;
75 u8 pmcregs_in_use;
76 u8 reserved8[28];
77 __be64 wait_state_cycles; /* Wait cycles for this proc */
78 u8 reserved9[28];
79 __be16 slb_count; /* # of SLBs to maintain */
80 u8 idle; /* Indicate OS is idle */
81 u8 vmxregs_in_use;
82
83 /* cacheline 3 is shared with other processors */
84
85 /*
86 * This is the yield_count. An "odd" value (low bit on) means that
87 * the processor is yielded (either because of an OS yield or a
88 * hypervisor preempt). An even value implies that the processor is
89 * currently executing.
90 * NOTE: Even dedicated processor partitions can yield so this
91 * field cannot be used to determine if we are shared or dedicated.
92 */
93 volatile __be32 yield_count;
94 volatile __be32 dispersion_count; /* dispatch changed physical cpu */
95 volatile __be64 cmo_faults; /* CMO page fault count */
96 volatile __be64 cmo_fault_time; /* CMO page fault time */
97 u8 reserved10[104];
98
99 /* cacheline 4-5 */
100
101 __be32 page_ins; /* CMO Hint - # page ins by OS */
102 u8 reserved11[148];
103 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
104 u8 reserved12[96];
105 } ____cacheline_aligned;
106
107 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
108
109 /*
110 * We are using a non architected field to determine if a partition is
111 * shared or dedicated. This currently works on both KVM and PHYP, but
112 * we will have to transition to something better.
113 */
114 #define LPPACA_OLD_SHARED_PROC 2
115
lppaca_shared_proc(struct lppaca * l)116 static inline bool lppaca_shared_proc(struct lppaca *l)
117 {
118 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
119 return false;
120 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
121 }
122
123 /*
124 * SLB shadow buffer structure as defined in the PAPR. The save_area
125 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
126 * ESID is stored in the lower 64bits, then the VSID.
127 */
128 struct slb_shadow {
129 __be32 persistent; /* Number of persistent SLBs */
130 __be32 buffer_length; /* Total shadow buffer length */
131 __be64 reserved;
132 struct {
133 __be64 esid;
134 __be64 vsid;
135 } save_area[SLB_NUM_BOLTED];
136 } ____cacheline_aligned;
137
138 /*
139 * Layout of entries in the hypervisor's dispatch trace log buffer.
140 */
141 struct dtl_entry {
142 u8 dispatch_reason;
143 u8 preempt_reason;
144 __be16 processor_id;
145 __be32 enqueue_to_dispatch_time;
146 __be32 ready_to_enqueue_time;
147 __be32 waiting_to_ready_time;
148 __be64 timebase;
149 __be64 fault_addr;
150 __be64 srr0;
151 __be64 srr1;
152 };
153
154 #define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
155 #define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
156
157 extern struct kmem_cache *dtl_cache;
158
159 /*
160 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
161 * reading from the dispatch trace log. If other code wants to consume
162 * DTL entries, it can set this pointer to a function that will get
163 * called once for each DTL entry that gets processed.
164 */
165 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
166
167 #endif /* CONFIG_PPC_BOOK3S */
168 #endif /* __KERNEL__ */
169 #endif /* _ASM_POWERPC_LPPACA_H */
170
