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 #ifdef __KERNEL__
  10
  11 /*
  12  * These definitions relate to hypervisors that only exist when using
  13  * a server type processor
  14  */
  15 #ifdef CONFIG_PPC_BOOK3S
  16
  17 /*
  18  * This control block contains the data that is shared between the
  19  * hypervisor and the OS.
  20  */
  21 #include <linux/cache.h>
  22 #include <linux/threads.h>
  23 #include <asm/types.h>
  24 #include <asm/mmu.h>
  25 #include <asm/firmware.h>
  26 #include <asm/paca.h>
  27
  28 /*
  29  * The lppaca is the "virtual processor area" registered with the hypervisor,
  30  * H_REGISTER_VPA etc.
  31  *
  32  * According to PAPR, the structure is 640 bytes long, must be L1 cache line
  33  * aligned, and must not cross a 4kB boundary. Its size field must be at
  34  * least 640 bytes (but may be more).
  35  *
  36  * Pre-v4.14 KVM hypervisors reject the VPA if its size field is smaller than
  37  * 1kB, so we dynamically allocate 1kB and advertise size as 1kB, but keep
  38  * this structure as the canonical 640 byte size.
  39  */
  40 struct lppaca {
  41         /* cacheline 1 contains read-only data */
  42
  43         __be32  desc;                   /* Eye catcher 0xD397D781 */
  44         __be16  size;                   /* Size of this struct */
  45         u8      reserved1[3];
  46         u8      __old_status;           /* Old status, including shared proc */
  47         u8      reserved3[14];
  48         volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
  49         volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
  50         u8      reserved4[56];
  51         volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
  52                                           /* associativity change counters */
  53         u8      reserved5[32];
  54
  55         /* cacheline 2 contains local read-write data */
  56
  57         u8      reserved6[48];
  58         u8      cede_latency_hint;
  59         u8      ebb_regs_in_use;
  60         u8      reserved7[6];
  61         u8      dtl_enable_mask;        /* Dispatch Trace Log mask */
  62         u8      donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
  63         u8      fpregs_in_use;
  64         u8      pmcregs_in_use;
  65         u8      l2_counters_enable;  /* Enable usage of counters for KVM guest */
  66         u8      reserved8[27];
  67         __be64  wait_state_cycles;      /* Wait cycles for this proc */
  68         u8      reserved9[28];
  69         __be16  slb_count;              /* # of SLBs to maintain */
  70         u8      idle;                   /* Indicate OS is idle */
  71         u8      vmxregs_in_use;
  72
  73         /* cacheline 3 is shared with other processors */
  74
  75         /*
  76          * This is the yield_count.  An "odd" value (low bit on) means that
  77          * the processor is yielded (either because of an OS yield or a
  78          * hypervisor preempt).  An even value implies that the processor is
  79          * currently executing.
  80          * NOTE: Even dedicated processor partitions can yield so this
  81          * field cannot be used to determine if we are shared or dedicated.
  82          */
  83         volatile __be32 yield_count;
  84         volatile __be32 dispersion_count; /* dispatch changed physical cpu */
  85         volatile __be64 cmo_faults;     /* CMO page fault count */
  86         volatile __be64 cmo_fault_time; /* CMO page fault time */
  87         u8      reserved10[64];         /* [S]PURR expropriated/donated */
  88         volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */
  89         volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */
  90         volatile __be64 wait_ready_tb;  /* Total TB wait->ready */
  91         u8      reserved11[16];
  92
  93         /* cacheline 4-5 */
  94
  95         __be32  page_ins;               /* CMO Hint - # page ins by OS */
  96         u8      reserved12[28];
  97         volatile __be64 l1_to_l2_cs_tb;
  98         volatile __be64 l2_to_l1_cs_tb;
  99         volatile __be64 l2_runtime_tb;
 100         u8 reserved13[96];
 101         volatile __be64 dtl_idx;        /* Dispatch Trace Log head index */
 102         u8      reserved14[96];
 103 } ____cacheline_aligned;
 104
 105 #define lppaca_of(cpu)  (*paca_ptrs[cpu]->lppaca_ptr)
 106
 107 /*
 108  * We are using a non architected field to determine if a partition is
 109  * shared or dedicated. This currently works on both KVM and PHYP, but
 110  * we will have to transition to something better.
 111  */
 112 #define LPPACA_OLD_SHARED_PROC          2
 113
 114 #ifdef CONFIG_PPC_PSERIES
 115 /*
 116  * All CPUs should have the same shared proc value, so directly access the PACA
 117  * to avoid false positives from DEBUG_PREEMPT.
 118  */
 119 static inline bool lppaca_shared_proc(void)
 120 {
 121         struct lppaca *l = local_paca->lppaca_ptr;
 122
 123         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 124                 return false;
 125         return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
 126 }
 127
 128 #define get_lppaca()    (get_paca()->lppaca_ptr)
 129 #endif
 130
 131 /*
 132  * SLB shadow buffer structure as defined in the PAPR.  The save_area
 133  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
 134  * ESID is stored in the lower 64bits, then the VSID.
 135  */
 136 struct slb_shadow {
 137         __be32  persistent;             /* Number of persistent SLBs */
 138         __be32  buffer_length;          /* Total shadow buffer length */
 139         __be64  reserved;
 140         struct  {
 141                 __be64     esid;
 142                 __be64  vsid;
 143         } save_area[SLB_NUM_BOLTED];
 144 } ____cacheline_aligned;
 145
 146 #endif /* CONFIG_PPC_BOOK3S */
 147 #endif /* __KERNEL__ */
 148 #endif /* _ASM_POWERPC_LPPACA_H */