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 /*
10 * The below VPHN macros are outside the __KERNEL__ check since these are
11 * used for compiling the vphn selftest in userspace
12 */
13
14 /* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
15 #define VPHN_REGISTER_COUNT 6
16
17 /*
18 * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
19 * form the complete property we have to add the length in the first cell.
20 */
21 #define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
22
23 /*
24 * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
25 * 1 for retrieving associativity information for a guest cpu
26 * 2 for retrieving associativity information for a host/hypervisor cpu
27 */
28 #define VPHN_FLAG_VCPU 1
29 #define VPHN_FLAG_PCPU 2
30
31 #ifdef __KERNEL__
32
33 /*
34 * These definitions relate to hypervisors that only exist when using
35 * a server type processor
36 */
37 #ifdef CONFIG_PPC_BOOK3S
38
39 /*
40 * This control block contains the data that is shared between the
41 * hypervisor and the OS.
42 */
43 #include <linux/cache.h>
44 #include <linux/threads.h>
45 #include <asm/types.h>
46 #include <asm/mmu.h>
47 #include <asm/firmware.h>
48
49 /*
50 * The lppaca is the "virtual processor area" registered with the hypervisor,
51 * H_REGISTER_VPA etc.
52 *
53 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
54 * aligned, and must not cross a 4kB boundary. Its size field must be at
55 * least 640 bytes (but may be more).
56 *
57 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
58 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
59 * this structure as the canonical 640 byte size.
60 */
61 struct lppaca {
62 /* cacheline 1 contains read-only data */
63
64 __be32 desc; /* Eye catcher 0xD397D781 */
65 __be16 size; /* Size of this struct */
66 u8 reserved1[3];
67 u8 __old_status; /* Old status, including shared proc */
68 u8 reserved3[14];
69 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
70 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
71 u8 reserved4[56];
72 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
73 /* associativity change counters */
74 u8 reserved5[32];
75
76 /* cacheline 2 contains local read-write data */
77
78 u8 reserved6[48];
79 u8 cede_latency_hint;
80 u8 ebb_regs_in_use;
81 u8 reserved7[6];
82 u8 dtl_enable_mask; /* Dispatch Trace Log mask */
83 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
84 u8 fpregs_in_use;
85 u8 pmcregs_in_use;
86 u8 reserved8[28];
87 __be64 wait_state_cycles; /* Wait cycles for this proc */
88 u8 reserved9[28];
89 __be16 slb_count; /* # of SLBs to maintain */
90 u8 idle; /* Indicate OS is idle */
91 u8 vmxregs_in_use;
92
93 /* cacheline 3 is shared with other processors */
94
95 /*
96 * This is the yield_count. An "odd" value (low bit on) means that
97 * the processor is yielded (either because of an OS yield or a
98 * hypervisor preempt). An even value implies that the processor is
99 * currently executing.
100 * NOTE: Even dedicated processor partitions can yield so this
101 * field cannot be used to determine if we are shared or dedicated.
102 */
103 volatile __be32 yield_count;
104 volatile __be32 dispersion_count; /* dispatch changed physical cpu */
105 volatile __be64 cmo_faults; /* CMO page fault count */
106 volatile __be64 cmo_fault_time; /* CMO page fault time */
107 u8 reserved10[104];
108
109 /* cacheline 4-5 */
110
111 __be32 page_ins; /* CMO Hint - # page ins by OS */
112 u8 reserved11[148];
113 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
114 u8 reserved12[96];
115 } ____cacheline_aligned;
116
117 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
118
119 /*
120 * We are using a non architected field to determine if a partition is
121 * shared or dedicated. This currently works on both KVM and PHYP, but
122 * we will have to transition to something better.
123 */
124 #define LPPACA_OLD_SHARED_PROC 2
125
lppaca_shared_proc(struct lppaca * l)126 static inline bool lppaca_shared_proc(struct lppaca *l)
127 {
128 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
129 return false;
130 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
131 }
132
133 /*
134 * SLB shadow buffer structure as defined in the PAPR. The save_area
135 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
136 * ESID is stored in the lower 64bits, then the VSID.
137 */
138 struct slb_shadow {
139 __be32 persistent; /* Number of persistent SLBs */
140 __be32 buffer_length; /* Total shadow buffer length */
141 __be64 reserved;
142 struct {
143 __be64 esid;
144 __be64 vsid;
145 } save_area[SLB_NUM_BOLTED];
146 } ____cacheline_aligned;
147
148 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
149
150 #endif /* CONFIG_PPC_BOOK3S */
151 #endif /* __KERNEL__ */
152 #endif /* _ASM_POWERPC_LPPACA_H */
153
