LXR linux/arch/powerpc/include/asm/lppaca.h

   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 */
  61struct 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
 126static 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 */
 138struct 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
 148extern 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