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 <linux/spinlock_types.h>
  46 #include <asm/types.h>
  47 #include <asm/mmu.h>
  48 #include <asm/firmware.h>
  49
  50 /*
  51  * The lppaca is the "virtual processor area" registered with the hypervisor,
  52  * H_REGISTER_VPA etc.
  53  *
  54  * According to PAPR, the structure is 640 bytes long, must be L1 cache line
  55  * aligned, and must not cross a 4kB boundary. Its size field must be at
  56  * least 640 bytes (but may be more).
  57  *
  58  * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
  59  * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
  60  * this structure as the canonical 640 byte size.
  61  */
  62 struct lppaca {
  63         /* cacheline 1 contains read-only data */
  64
  65         __be32  desc;                   /* Eye catcher 0xD397D781 */
  66         __be16  size;                   /* Size of this struct */
  67         u8      reserved1[3];
  68         u8      __old_status;           /* Old status, including shared proc */
  69         u8      reserved3[14];
  70         volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
  71         volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
  72         u8      reserved4[56];
  73         volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
  74                                           /* associativity change counters */
  75         u8      reserved5[32];
  76
  77         /* cacheline 2 contains local read-write data */
  78
  79         u8      reserved6[48];
  80         u8      cede_latency_hint;
  81         u8      ebb_regs_in_use;
  82         u8      reserved7[6];
  83         u8      dtl_enable_mask;        /* Dispatch Trace Log mask */
  84         u8      donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
  85         u8      fpregs_in_use;
  86         u8      pmcregs_in_use;
  87         u8      reserved8[28];
  88         __be64  wait_state_cycles;      /* Wait cycles for this proc */
  89         u8      reserved9[28];
  90         __be16  slb_count;              /* # of SLBs to maintain */
  91         u8      idle;                   /* Indicate OS is idle */
  92         u8      vmxregs_in_use;
  93
  94         /* cacheline 3 is shared with other processors */
  95
  96         /*
  97          * This is the yield_count.  An "odd" value (low bit on) means that
  98          * the processor is yielded (either because of an OS yield or a
  99          * hypervisor preempt).  An even value implies that the processor is
 100          * currently executing.
 101          * NOTE: Even dedicated processor partitions can yield so this
 102          * field cannot be used to determine if we are shared or dedicated.
 103          */
 104         volatile __be32 yield_count;
 105         volatile __be32 dispersion_count; /* dispatch changed physical cpu */
 106         volatile __be64 cmo_faults;     /* CMO page fault count */
 107         volatile __be64 cmo_fault_time; /* CMO page fault time */
 108         u8      reserved10[104];
 109
 110         /* cacheline 4-5 */
 111
 112         __be32  page_ins;               /* CMO Hint - # page ins by OS */
 113         u8      reserved11[148];
 114         volatile __be64 dtl_idx;        /* Dispatch Trace Log head index */
 115         u8      reserved12[96];
 116 } ____cacheline_aligned;
 117
 118 #define lppaca_of(cpu)  (*paca_ptrs[cpu]->lppaca_ptr)
 119
 120 /*
 121  * We are using a non architected field to determine if a partition is
 122  * shared or dedicated. This currently works on both KVM and PHYP, but
 123  * we will have to transition to something better.
 124  */
 125 #define LPPACA_OLD_SHARED_PROC          2
 126
 127 static inline bool lppaca_shared_proc(struct lppaca *l)
 128 {
 129         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 130                 return false;
 131         return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
 132 }
 133
 134 /*
 135  * SLB shadow buffer structure as defined in the PAPR.  The save_area
 136  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
 137  * ESID is stored in the lower 64bits, then the VSID.
 138  */
 139 struct slb_shadow {
 140         __be32  persistent;             /* Number of persistent SLBs */
 141         __be32  buffer_length;          /* Total shadow buffer length */
 142         __be64  reserved;
 143         struct  {
 144                 __be64     esid;
 145                 __be64  vsid;
 146         } save_area[SLB_NUM_BOLTED];
 147 } ____cacheline_aligned;
 148
 149 /*
 150  * Layout of entries in the hypervisor's dispatch trace log buffer.
 151  */
 152 struct dtl_entry {
 153         u8      dispatch_reason;
 154         u8      preempt_reason;
 155         __be16  processor_id;
 156         __be32  enqueue_to_dispatch_time;
 157         __be32  ready_to_enqueue_time;
 158         __be32  waiting_to_ready_time;
 159         __be64  timebase;
 160         __be64  fault_addr;
 161         __be64  srr0;
 162         __be64  srr1;
 163 };
 164
 165 #define DISPATCH_LOG_BYTES      4096    /* bytes per cpu */
 166 #define N_DISPATCH_LOG          (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
 167
 168 /*
 169  * Dispatch trace log event enable mask:
 170  *   0x1: voluntary virtual processor waits
 171  *   0x2: time-slice preempts
 172  *   0x4: virtual partition memory page faults
 173  */
 174 #define DTL_LOG_CEDE            0x1
 175 #define DTL_LOG_PREEMPT         0x2
 176 #define DTL_LOG_FAULT           0x4
 177 #define DTL_LOG_ALL             (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
 178
 179 extern struct kmem_cache *dtl_cache;
 180 extern rwlock_t dtl_access_lock;
 181
 182 /*
 183  * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
 184  * reading from the dispatch trace log.  If other code wants to consume
 185  * DTL entries, it can set this pointer to a function that will get
 186  * called once for each DTL entry that gets processed.
 187  */
 188 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
 189
 190 extern void register_dtl_buffer(int cpu);
 191 extern void alloc_dtl_buffers(unsigned long *time_limit);
 192 extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
 193
 194 #endif /* CONFIG_PPC_BOOK3S */
 195 #endif /* __KERNEL__ */
 196 #endif /* _ASM_POWERPC_LPPACA_H */