3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
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.
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.
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
19 #ifndef _ASM_POWERPC_LPPACA_H
20 #define _ASM_POWERPC_LPPACA_H
23 * The below VPHN macros are outside the __KERNEL__ check since these are
24 * used for compiling the vphn selftest in userspace
27 /* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
28 #define VPHN_REGISTER_COUNT 6
31 * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
32 * form the complete property we have to add the length in the first cell.
34 #define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
37 * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
38 * 1 for retrieving associativity information for a guest cpu
39 * 2 for retrieving associativity information for a host/hypervisor cpu
41 #define VPHN_FLAG_VCPU 1
42 #define VPHN_FLAG_PCPU 2
47 * These definitions relate to hypervisors that only exist when using
48 * a server type processor
50 #ifdef CONFIG_PPC_BOOK3S
53 * This control block contains the data that is shared between the
54 * hypervisor and the OS.
56 #include <linux/cache.h>
57 #include <linux/threads.h>
58 #include <linux/spinlock_types.h>
59 #include <asm/types.h>
61 #include <asm/firmware.h>
64 * The lppaca is the "virtual processor area" registered with the hypervisor,
67 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
68 * aligned, and must not cross a 4kB boundary. Its size field must be at
69 * least 640 bytes (but may be more).
71 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
72 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
73 * this structure as the canonical 640 byte size.
76 /* cacheline 1 contains read-only data */
78 __be32 desc; /* Eye catcher 0xD397D781 */
79 __be16 size; /* Size of this struct */
81 u8 __old_status; /* Old status, including shared proc */
83 volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
84 volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
86 volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
87 /* associativity change counters */
90 /* cacheline 2 contains local read-write data */
96 u8 dtl_enable_mask; /* Dispatch Trace Log mask */
97 u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
101 __be64 wait_state_cycles; /* Wait cycles for this proc */
103 __be16 slb_count; /* # of SLBs to maintain */
104 u8 idle; /* Indicate OS is idle */
107 /* cacheline 3 is shared with other processors */
110 * This is the yield_count. An "odd" value (low bit on) means that
111 * the processor is yielded (either because of an OS yield or a
112 * hypervisor preempt). An even value implies that the processor is
113 * currently executing.
114 * NOTE: Even dedicated processor partitions can yield so this
115 * field cannot be used to determine if we are shared or dedicated.
117 volatile __be32 yield_count;
118 volatile __be32 dispersion_count; /* dispatch changed physical cpu */
119 volatile __be64 cmo_faults; /* CMO page fault count */
120 volatile __be64 cmo_fault_time; /* CMO page fault time */
125 __be32 page_ins; /* CMO Hint - # page ins by OS */
127 volatile __be64 dtl_idx; /* Dispatch Trace Log head index */
129 } ____cacheline_aligned;
131 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
134 * We are using a non architected field to determine if a partition is
135 * shared or dedicated. This currently works on both KVM and PHYP, but
136 * we will have to transition to something better.
138 #define LPPACA_OLD_SHARED_PROC 2
140 static inline bool lppaca_shared_proc(struct lppaca *l)
142 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
144 return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
148 * SLB shadow buffer structure as defined in the PAPR. The save_area
149 * contains adjacent ESID and VSID pairs for each shadowed SLB. The
150 * ESID is stored in the lower 64bits, then the VSID.
153 __be32 persistent; /* Number of persistent SLBs */
154 __be32 buffer_length; /* Total shadow buffer length */
159 } save_area[SLB_NUM_BOLTED];
160 } ____cacheline_aligned;
163 * Layout of entries in the hypervisor's dispatch trace log buffer.
169 __be32 enqueue_to_dispatch_time;
170 __be32 ready_to_enqueue_time;
171 __be32 waiting_to_ready_time;
178 #define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
179 #define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
182 * Dispatch trace log event enable mask:
183 * 0x1: voluntary virtual processor waits
184 * 0x2: time-slice preempts
185 * 0x4: virtual partition memory page faults
187 #define DTL_LOG_CEDE 0x1
188 #define DTL_LOG_PREEMPT 0x2
189 #define DTL_LOG_FAULT 0x4
190 #define DTL_LOG_ALL (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
192 extern struct kmem_cache *dtl_cache;
193 extern rwlock_t dtl_access_lock;
196 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
197 * reading from the dispatch trace log. If other code wants to consume
198 * DTL entries, it can set this pointer to a function that will get
199 * called once for each DTL entry that gets processed.
201 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
203 extern void register_dtl_buffer(int cpu);
204 extern void alloc_dtl_buffers(unsigned long *time_limit);
205 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
207 #endif /* CONFIG_PPC_BOOK3S */
208 #endif /* __KERNEL__ */
209 #endif /* _ASM_POWERPC_LPPACA_H */