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 */
40 struct 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 */
lppaca_shared_proc(void)114 static 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 */
131 struct 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
