1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 * Copyright (C) 2001 Mike Corrigan IBM Corporation
6 #ifndef _ASM_POWERPC_LPPACA_H
7 #define _ASM_POWERPC_LPPACA_H
11 * These definitions relate to hypervisors that only exist when using
12 * a server type processor
14 #ifdef CONFIG_PPC_BOOK3S
17 * This control block contains the data that is shared between the
18 * hypervisor and the OS.
20 #include <linux/cache.h>
21 #include <linux/threads.h>
22 #include <asm/types.h>
24 #include <asm/firmware.h>
27 * The lppaca is the "virtual processor area" registered with the hypervisor,
30 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
31 * aligned, and must not cross a 4kB boundary. Its size field must be at
32 * least 640 bytes (but may be more).
34 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
35 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
36 * this structure as the canonical 640 byte size.
39 /* cacheline 1 contains read-only data */
41 __be32 desc; /* Eye catcher 0xD397D781 */
42 __be16 size; /* Size of this struct */
44 u8 __old_status; /* Old status, including shared proc */
46 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
47 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
49 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
50 /* associativity change counters */
53 /* cacheline 2 contains local read-write data */
59 u8 dtl_enable_mask; /* Dispatch Trace Log mask */
60 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
64 __be64 wait_state_cycles; /* Wait cycles for this proc */
66 __be16 slb_count; /* # of SLBs to maintain */
67 u8 idle; /* Indicate OS is idle */
70 /* cacheline 3 is shared with other processors */
73 * This is the yield_count. An "odd" value (low bit on) means that
74 * the processor is yielded (either because of an OS yield or a
75 * hypervisor preempt). An even value implies that the processor is
76 * currently executing.
77 * NOTE: Even dedicated processor partitions can yield so this
78 * field cannot be used to determine if we are shared or dedicated.
80 volatile __be32 yield_count;
81 volatile __be32 dispersion_count; /* dispatch changed physical cpu */
82 volatile __be64 cmo_faults; /* CMO page fault count */
83 volatile __be64 cmo_fault_time; /* CMO page fault time */
88 __be32 page_ins; /* CMO Hint - # page ins by OS */
90 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
92 } ____cacheline_aligned;
94 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
97 * We are using a non architected field to determine if a partition is
98 * shared or dedicated. This currently works on both KVM and PHYP, but
99 * we will have to transition to something better.
101 #define LPPACA_OLD_SHARED_PROC 2
103 static inline bool lppaca_shared_proc(struct lppaca *l)
105 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
107 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
111 * SLB shadow buffer structure as defined in the PAPR. The save_area
112 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
113 * ESID is stored in the lower 64bits, then the VSID.
116 __be32 persistent; /* Number of persistent SLBs */
117 __be32 buffer_length; /* Total shadow buffer length */
122 } save_area[SLB_NUM_BOLTED];
123 } ____cacheline_aligned;
126 * Layout of entries in the hypervisor's dispatch trace log buffer.
132 __be32 enqueue_to_dispatch_time;
133 __be32 ready_to_enqueue_time;
134 __be32 waiting_to_ready_time;
141 #define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
142 #define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
144 extern struct kmem_cache *dtl_cache;
147 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
148 * reading from the dispatch trace log. If other code wants to consume
149 * DTL entries, it can set this pointer to a function that will get
150 * called once for each DTL entry that gets processed.
152 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
154 #endif /* CONFIG_PPC_BOOK3S */
155 #endif /* __KERNEL__ */
156 #endif /* _ASM_POWERPC_LPPACA_H */