linux/arch/powerpc/include/asm/lppaca.h
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   1/*
   2 * lppaca.h
   3 * Copyright (C) 2001  Mike Corrigan IBM Corporation
   4 *
   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.
   9 *
  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.
  14 *
  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
  18 */
  19#ifndef _ASM_POWERPC_LPPACA_H
  20#define _ASM_POWERPC_LPPACA_H
  21#ifdef __KERNEL__
  22
  23/*
  24 * These definitions relate to hypervisors that only exist when using
  25 * a server type processor
  26 */
  27#ifdef CONFIG_PPC_BOOK3S
  28
  29/*
  30 * This control block contains the data that is shared between the
  31 * hypervisor and the OS.
  32 */
  33#include <linux/cache.h>
  34#include <linux/threads.h>
  35#include <asm/types.h>
  36#include <asm/mmu.h>
  37#include <asm/firmware.h>
  38
  39/*
  40 * The lppaca is the "virtual processor area" registered with the hypervisor,
  41 * H_REGISTER_VPA etc.
  42 *
  43 * According to PAPR, the structure is 640 bytes long, must be L1 cache line
  44 * aligned, and must not cross a 4kB boundary. Its size field must be at
  45 * least 640 bytes (but may be more).
  46 *
  47 * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
  48 * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
  49 * this structure as the canonical 640 byte size.
  50 */
  51struct lppaca {
  52        /* cacheline 1 contains read-only data */
  53
  54        __be32  desc;                   /* Eye catcher 0xD397D781 */
  55        __be16  size;                   /* Size of this struct */
  56        u8      reserved1[3];
  57        u8      __old_status;           /* Old status, including shared proc */
  58        u8      reserved3[14];
  59        volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
  60        volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
  61        u8      reserved4[56];
  62        volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
  63                                          /* associativity change counters */
  64        u8      reserved5[32];
  65
  66        /* cacheline 2 contains local read-write data */
  67
  68        u8      reserved6[48];
  69        u8      cede_latency_hint;
  70        u8      ebb_regs_in_use;
  71        u8      reserved7[6];
  72        u8      dtl_enable_mask;        /* Dispatch Trace Log mask */
  73        u8      donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
  74        u8      fpregs_in_use;
  75        u8      pmcregs_in_use;
  76        u8      reserved8[28];
  77        __be64  wait_state_cycles;      /* Wait cycles for this proc */
  78        u8      reserved9[28];
  79        __be16  slb_count;              /* # of SLBs to maintain */
  80        u8      idle;                   /* Indicate OS is idle */
  81        u8      vmxregs_in_use;
  82
  83        /* cacheline 3 is shared with other processors */
  84
  85        /*
  86         * This is the yield_count.  An "odd" value (low bit on) means that
  87         * the processor is yielded (either because of an OS yield or a
  88         * hypervisor preempt).  An even value implies that the processor is
  89         * currently executing.
  90         * NOTE: Even dedicated processor partitions can yield so this
  91         * field cannot be used to determine if we are shared or dedicated.
  92         */
  93        volatile __be32 yield_count;
  94        volatile __be32 dispersion_count; /* dispatch changed physical cpu */
  95        volatile __be64 cmo_faults;     /* CMO page fault count */
  96        volatile __be64 cmo_fault_time; /* CMO page fault time */
  97        u8      reserved10[104];
  98
  99        /* cacheline 4-5 */
 100
 101        __be32  page_ins;               /* CMO Hint - # page ins by OS */
 102        u8      reserved11[148];
 103        volatile __be64 dtl_idx;        /* Dispatch Trace Log head index */
 104        u8      reserved12[96];
 105} ____cacheline_aligned;
 106
 107#define lppaca_of(cpu)  (*paca_ptrs[cpu]->lppaca_ptr)
 108
 109/*
 110 * We are using a non architected field to determine if a partition is
 111 * shared or dedicated. This currently works on both KVM and PHYP, but
 112 * we will have to transition to something better.
 113 */
 114#define LPPACA_OLD_SHARED_PROC          2
 115
 116static inline bool lppaca_shared_proc(struct lppaca *l)
 117{
 118        if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 119                return false;
 120        return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
 121}
 122
 123/*
 124 * SLB shadow buffer structure as defined in the PAPR.  The save_area
 125 * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
 126 * ESID is stored in the lower 64bits, then the VSID.
 127 */
 128struct slb_shadow {
 129        __be32  persistent;             /* Number of persistent SLBs */
 130        __be32  buffer_length;          /* Total shadow buffer length */
 131        __be64  reserved;
 132        struct  {
 133                __be64     esid;
 134                __be64  vsid;
 135        } save_area[SLB_NUM_BOLTED];
 136} ____cacheline_aligned;
 137
 138/*
 139 * Layout of entries in the hypervisor's dispatch trace log buffer.
 140 */
 141struct dtl_entry {
 142        u8      dispatch_reason;
 143        u8      preempt_reason;
 144        __be16  processor_id;
 145        __be32  enqueue_to_dispatch_time;
 146        __be32  ready_to_enqueue_time;
 147        __be32  waiting_to_ready_time;
 148        __be64  timebase;
 149        __be64  fault_addr;
 150        __be64  srr0;
 151        __be64  srr1;
 152};
 153
 154#define DISPATCH_LOG_BYTES      4096    /* bytes per cpu */
 155#define N_DISPATCH_LOG          (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
 156
 157extern struct kmem_cache *dtl_cache;
 158
 159/*
 160 * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
 161 * reading from the dispatch trace log.  If other code wants to consume
 162 * DTL entries, it can set this pointer to a function that will get
 163 * called once for each DTL entry that gets processed.
 164 */
 165extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
 166
 167#endif /* CONFIG_PPC_BOOK3S */
 168#endif /* __KERNEL__ */
 169#endif /* _ASM_POWERPC_LPPACA_H */
 170