arch/powerpc/include/asm/lppaca.h

   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
  38 /*
  39  * We only have to have statically allocated lppaca structs on
  40  * legacy iSeries, which supports at most 64 cpus.
  41  */
  42 #define NR_LPPACAS      1
  43
  44 /*
  45  * The Hypervisor barfs if the lppaca crosses a page boundary.  A 1k
  46  * alignment is sufficient to prevent this
  47  */
  48 struct lppaca {
  49         /* cacheline 1 contains read-only data */
  50
  51         __be32  desc;                   /* Eye catcher 0xD397D781 */
  52         __be16  size;                   /* Size of this struct */
  53         u8      reserved1[3];
  54         u8      __old_status;           /* Old status, including shared proc */
  55         u8      reserved3[14];
  56         volatile __be32 dyn_hw_node_id; /* Dynamic hardware node id */
  57         volatile __be32 dyn_hw_proc_id; /* Dynamic hardware proc id */
  58         u8      reserved4[56];
  59         volatile u8 vphn_assoc_counts[8]; /* Virtual processor home node */
  60                                           /* associativity change counters */
  61         u8      reserved5[32];
  62
  63         /* cacheline 2 contains local read-write data */
  64
  65         u8      reserved6[48];
  66         u8      cede_latency_hint;
  67         u8      ebb_regs_in_use;
  68         u8      reserved7[6];
  69         u8      dtl_enable_mask;        /* Dispatch Trace Log mask */
  70         u8      donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
  71         u8      fpregs_in_use;
  72         u8      pmcregs_in_use;
  73         u8      reserved8[28];
  74         __be64  wait_state_cycles;      /* Wait cycles for this proc */
  75         u8      reserved9[28];
  76         __be16  slb_count;              /* # of SLBs to maintain */
  77         u8      idle;                   /* Indicate OS is idle */
  78         u8      vmxregs_in_use;
  79
  80         /* cacheline 3 is shared with other processors */
  81
  82         /*
  83          * This is the yield_count.  An "odd" value (low bit on) means that
  84          * the processor is yielded (either because of an OS yield or a
  85          * hypervisor preempt).  An even value implies that the processor is
  86          * currently executing.
  87          * NOTE: Even dedicated processor partitions can yield so this
  88          * field cannot be used to determine if we are shared or dedicated.
  89          */
  90         volatile __be32 yield_count;
  91         volatile __be32 dispersion_count; /* dispatch changed physical cpu */
  92         volatile __be64 cmo_faults;     /* CMO page fault count */
  93         volatile __be64 cmo_fault_time; /* CMO page fault time */
  94         u8      reserved10[104];
  95
  96         /* cacheline 4-5 */
  97
  98         __be32  page_ins;               /* CMO Hint - # page ins by OS */
  99         u8      reserved11[148];
 100         volatile __be64 dtl_idx;                /* Dispatch Trace Log head index */
 101         u8      reserved12[96];
 102 } __attribute__((__aligned__(0x400)));
 103
 104 extern struct lppaca lppaca[];
 105
 106 #define lppaca_of(cpu)  (*paca[cpu].lppaca_ptr)
 107
 108 /*
 109  * We are using a non architected field to determine if a partition is
 110  * shared or dedicated. This currently works on both KVM and PHYP, but
 111  * we will have to transition to something better.
 112  */
 113 #define LPPACA_OLD_SHARED_PROC          2
 114
 115 static inline bool lppaca_shared_proc(struct lppaca *l)
 116 {
 117         return !!(l->__old_status & LPPACA_OLD_SHARED_PROC);
 118 }
 119
 120 /*
 121  * SLB shadow buffer structure as defined in the PAPR.  The save_area
 122  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
 123  * ESID is stored in the lower 64bits, then the VSID.
 124  */
 125 struct slb_shadow {
 126         __be32  persistent;             /* Number of persistent SLBs */
 127         __be32  buffer_length;          /* Total shadow buffer length */
 128         __be64  reserved;
 129         struct  {
 130                 __be64     esid;
 131                 __be64  vsid;
 132         } save_area[SLB_NUM_BOLTED];
 133 } ____cacheline_aligned;
 134
 135 /*
 136  * Layout of entries in the hypervisor's dispatch trace log buffer.
 137  */
 138 struct dtl_entry {
 139         u8      dispatch_reason;
 140         u8      preempt_reason;
 141         __be16  processor_id;
 142         __be32  enqueue_to_dispatch_time;
 143         __be32  ready_to_enqueue_time;
 144         __be32  waiting_to_ready_time;
 145         __be64  timebase;
 146         __be64  fault_addr;
 147         __be64  srr0;
 148         __be64  srr1;
 149 };
 150
 151 #define DISPATCH_LOG_BYTES      4096    /* bytes per cpu */
 152 #define N_DISPATCH_LOG          (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
 153
 154 extern struct kmem_cache *dtl_cache;
 155
 156 /*
 157  * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
 158  * reading from the dispatch trace log.  If other code wants to consume
 159  * DTL entries, it can set this pointer to a function that will get
 160  * called once for each DTL entry that gets processed.
 161  */
 162 extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
 163
 164 #endif /* CONFIG_PPC_BOOK3S */
 165 #endif /* __KERNEL__ */
 166 #endif /* _ASM_POWERPC_LPPACA_H */