arch/mips/include/asm/cpu-info.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 Waldorf GMBH
   7  * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
   8  * Copyright (C) 1996 Paul M. Antoine
   9  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  10  * Copyright (C) 2004  Maciej W. Rozycki
  11  */
  12 #ifndef __ASM_CPU_INFO_H
  13 #define __ASM_CPU_INFO_H
  14
  15 #include <linux/cache.h>
  16 #include <linux/types.h>
  17
  18 #include <asm/mipsregs.h>
  19
  20 /*
  21  * Descriptor for a cache
  22  */
  23 struct cache_desc {
  24         unsigned int waysize;   /* Bytes per way */
  25         unsigned short sets;    /* Number of lines per set */
  26         unsigned char ways;     /* Number of ways */
  27         unsigned char linesz;   /* Size of line in bytes */
  28         unsigned char waybit;   /* Bits to select in a cache set */
  29         unsigned char flags;    /* Flags describing cache properties */
  30 };
  31
  32 struct guest_info {
  33         unsigned long           ases;
  34         unsigned long           ases_dyn;
  35         unsigned long long      options;
  36         unsigned long long      options_dyn;
  37         int                     tlbsize;
  38         u8                      conf;
  39         u8                      kscratch_mask;
  40 };
  41
  42 /*
  43  * Flag definitions
  44  */
  45 #define MIPS_CACHE_NOT_PRESENT  0x00000001
  46 #define MIPS_CACHE_VTAG         0x00000002      /* Virtually tagged cache */
  47 #define MIPS_CACHE_ALIASES      0x00000004      /* Cache could have aliases */
  48 #define MIPS_CACHE_IC_F_DC      0x00000008      /* Ic can refill from D-cache */
  49 #define MIPS_IC_SNOOPS_REMOTE   0x00000010      /* Ic snoops remote stores */
  50 #define MIPS_CACHE_PINDEX       0x00000020      /* Physically indexed cache */
  51
  52 struct cpuinfo_mips {
  53         unsigned long           asid_cache;
  54 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
  55         unsigned long           asid_mask;
  56 #endif
  57
  58         /*
  59          * Capability and feature descriptor structure for MIPS CPU
  60          */
  61         unsigned long           ases;
  62         unsigned long long      options;
  63         unsigned int            udelay_val;
  64         unsigned int            processor_id;
  65         unsigned int            fpu_id;
  66         unsigned int            fpu_csr31;
  67         unsigned int            fpu_msk31;
  68         unsigned int            msa_id;
  69         unsigned int            cputype;
  70         int                     isa_level;
  71         int                     tlbsize;
  72         int                     tlbsizevtlb;
  73         int                     tlbsizeftlbsets;
  74         int                     tlbsizeftlbways;
  75         struct cache_desc       icache; /* Primary I-cache */
  76         struct cache_desc       dcache; /* Primary D or combined I/D cache */
  77         struct cache_desc       vcache; /* Victim cache, between pcache and scache */
  78         struct cache_desc       scache; /* Secondary cache */
  79         struct cache_desc       tcache; /* Tertiary/split secondary cache */
  80         int                     srsets; /* Shadow register sets */
  81         int                     package;/* physical package number */
  82         unsigned int            globalnumber;
  83 #ifdef CONFIG_64BIT
  84         int                     vmbits; /* Virtual memory size in bits */
  85 #endif
  86         void                    *data;  /* Additional data */
  87         unsigned int            watch_reg_count;   /* Number that exist */
  88         unsigned int            watch_reg_use_cnt; /* Usable by ptrace */
  89 #define NUM_WATCH_REGS 4
  90         u16                     watch_reg_masks[NUM_WATCH_REGS];
  91         unsigned int            kscratch_mask; /* Usable KScratch mask. */
  92         /*
  93          * Cache Coherency attribute for write-combine memory writes.
  94          * (shifted by _CACHE_SHIFT)
  95          */
  96         unsigned int            writecombine;
  97         /*
  98          * Simple counter to prevent enabling HTW in nested
  99          * htw_start/htw_stop calls
 100          */
 101         unsigned int            htw_seq;
 102
 103         /* VZ & Guest features */
 104         struct guest_info       guest;
 105         unsigned int            gtoffset_mask;
 106         unsigned int            guestid_mask;
 107         unsigned int            guestid_cache;
 108 } __attribute__((aligned(SMP_CACHE_BYTES)));
 109
 110 extern struct cpuinfo_mips cpu_data[];
 111 #define current_cpu_data cpu_data[smp_processor_id()]
 112 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
 113 #define boot_cpu_data cpu_data[0]
 114
 115 extern void cpu_probe(void);
 116 extern void cpu_report(void);
 117
 118 extern const char *__cpu_name[];
 119 #define cpu_name_string()       __cpu_name[raw_smp_processor_id()]
 120
 121 struct seq_file;
 122 struct notifier_block;
 123
 124 extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
 125 extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
 126
 127 #define proc_cpuinfo_notifier(fn, pri)                                  \
 128 ({                                                                      \
 129         static struct notifier_block fn##_nb = {                        \
 130                 .notifier_call = fn,                                    \
 131                 .priority = pri                                         \
 132         };                                                              \
 133                                                                         \
 134         register_proc_cpuinfo_notifier(&fn##_nb);                       \
 135 })
 136
 137 struct proc_cpuinfo_notifier_args {
 138         struct seq_file *m;
 139         unsigned long n;
 140 };
 141
 142 static inline unsigned int cpu_cluster(struct cpuinfo_mips *cpuinfo)
 143 {
 144         /* Optimisation for systems where multiple clusters aren't used */
 145         if (!IS_ENABLED(CONFIG_CPU_MIPSR6))
 146                 return 0;
 147
 148         return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CLUSTER) >>
 149                 MIPS_GLOBALNUMBER_CLUSTER_SHF;
 150 }
 151
 152 static inline unsigned int cpu_core(struct cpuinfo_mips *cpuinfo)
 153 {
 154         return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_CORE) >>
 155                 MIPS_GLOBALNUMBER_CORE_SHF;
 156 }
 157
 158 static inline unsigned int cpu_vpe_id(struct cpuinfo_mips *cpuinfo)
 159 {
 160         /* Optimisation for systems where VP(E)s aren't used */
 161         if (!IS_ENABLED(CONFIG_MIPS_MT_SMP) && !IS_ENABLED(CONFIG_CPU_MIPSR6))
 162                 return 0;
 163
 164         return (cpuinfo->globalnumber & MIPS_GLOBALNUMBER_VP) >>
 165                 MIPS_GLOBALNUMBER_VP_SHF;
 166 }
 167
 168 extern void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster);
 169 extern void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core);
 170 extern void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe);
 171
 172 static inline bool cpus_are_siblings(int cpua, int cpub)
 173 {
 174         struct cpuinfo_mips *infoa = &cpu_data[cpua];
 175         struct cpuinfo_mips *infob = &cpu_data[cpub];
 176         unsigned int gnuma, gnumb;
 177
 178         if (infoa->package != infob->package)
 179                 return false;
 180
 181         gnuma = infoa->globalnumber & ~MIPS_GLOBALNUMBER_VP;
 182         gnumb = infob->globalnumber & ~MIPS_GLOBALNUMBER_VP;
 183         if (gnuma != gnumb)
 184                 return false;
 185
 186         return true;
 187 }
 188
 189 static inline unsigned long cpu_asid_inc(void)
 190 {
 191         return 1 << CONFIG_MIPS_ASID_SHIFT;
 192 }
 193
 194 static inline unsigned long cpu_asid_mask(struct cpuinfo_mips *cpuinfo)
 195 {
 196 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
 197         return cpuinfo->asid_mask;
 198 #endif
 199         return ((1 << CONFIG_MIPS_ASID_BITS) - 1) << CONFIG_MIPS_ASID_SHIFT;
 200 }
 201
 202 static inline void set_cpu_asid_mask(struct cpuinfo_mips *cpuinfo,
 203                                      unsigned long asid_mask)
 204 {
 205 #ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
 206         cpuinfo->asid_mask = asid_mask;
 207 #endif
 208 }
 209
 210 #endif /* __ASM_CPU_INFO_H */