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[64];		/* [S]PURR expropriated/donated */
108 	volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */
109 	volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */
110 	volatile __be64 wait_ready_tb;	/* Total TB wait->ready */
111 	u8	reserved11[16];
112 
113 	/* cacheline 4-5 */
114 
115 	__be32	page_ins;		/* CMO Hint - # page ins by OS */
116 	u8	reserved12[148];
117 	volatile __be64 dtl_idx;	/* Dispatch Trace Log head index */
118 	u8	reserved13[96];
119 } ____cacheline_aligned;
120 
121 #define lppaca_of(cpu)	(*paca_ptrs[cpu]->lppaca_ptr)
122 
123 /*
124  * We are using a non architected field to determine if a partition is
125  * shared or dedicated. This currently works on both KVM and PHYP, but
126  * we will have to transition to something better.
127  */
128 #define LPPACA_OLD_SHARED_PROC		2
129 
lppaca_shared_proc(struct lppaca * l)130 static inline bool lppaca_shared_proc(struct lppaca *l)
131 {
132 	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
133 		return false;
134 	return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
135 }
136 
137 /*
138  * SLB shadow buffer structure as defined in the PAPR.  The save_area
139  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
140  * ESID is stored in the lower 64bits, then the VSID.
141  */
142 struct slb_shadow {
143 	__be32	persistent;		/* Number of persistent SLBs */
144 	__be32	buffer_length;		/* Total shadow buffer length */
145 	__be64	reserved;
146 	struct	{
147 		__be64     esid;
148 		__be64	vsid;
149 	} save_area[SLB_NUM_BOLTED];
150 } ____cacheline_aligned;
151 
152 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
153 
154 #endif /* CONFIG_PPC_BOOK3S */
155 #endif /* __KERNEL__ */
156 #endif /* _ASM_POWERPC_LPPACA_H */
157