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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  */
   5 #ifndef __ASM_CPU_INFO_H
   6 #define __ASM_CPU_INFO_H
   7
   8 #include <linux/cache.h>
   9 #include <linux/types.h>
  10
  11 #include <asm/loongarch.h>
  12
  13 /* cache_desc->flags */
  14 enum {
  15         CACHE_PRESENT   = (1 << 0),
  16         CACHE_PRIVATE   = (1 << 1),     /* core private cache */
  17         CACHE_INCLUSIVE = (1 << 2),     /* include the inner level caches */
  18 };
  19
  20 /*
  21  * Descriptor for a cache
  22  */
  23 struct cache_desc {
  24         unsigned char type;
  25         unsigned char level;
  26         unsigned short sets;    /* Number of lines per set */
  27         unsigned char ways;     /* Number of ways */
  28         unsigned char linesz;   /* Size of line in bytes */
  29         unsigned char flags;    /* Flags describing cache properties */
  30 };
  31
  32 #define CACHE_LEVEL_MAX         3
  33 #define CACHE_LEAVES_MAX        6
  34
  35 struct cpuinfo_loongarch {
  36         u64                     asid_cache;
  37         unsigned long           asid_mask;
  38
  39         /*
  40          * Capability and feature descriptor structure for LoongArch CPU
  41          */
  42         unsigned long long      options;
  43         unsigned int            processor_id;
  44         unsigned int            fpu_vers;
  45         unsigned int            fpu_csr0;
  46         unsigned int            fpu_mask;
  47         unsigned int            cputype;
  48         int                     isa_level;
  49         int                     tlbsize;
  50         int                     tlbsizemtlb;
  51         int                     tlbsizestlbsets;
  52         int                     tlbsizestlbways;
  53         int                     cache_leaves_present; /* number of cache_leaves[] elements */
  54         struct cache_desc       cache_leaves[CACHE_LEAVES_MAX];
  55         int                     core;   /* physical core number in package */
  56         int                     package;/* physical package number */
  57         int                     global_id; /* physical global thread number */
  58         int                     vabits; /* Virtual Address size in bits */
  59         int                     pabits; /* Physical Address size in bits */
  60         unsigned int            ksave_mask; /* Usable KSave mask. */
  61         unsigned int            watch_dreg_count;   /* Number data breakpoints */
  62         unsigned int            watch_ireg_count;   /* Number instruction breakpoints */
  63         unsigned int            watch_reg_use_cnt; /* min(NUM_WATCH_REGS, watch_dreg_count + watch_ireg_count), Usable by ptrace */
  64 } __aligned(SMP_CACHE_BYTES);
  65
  66 extern struct cpuinfo_loongarch cpu_data[];
  67 #define boot_cpu_data cpu_data[0]
  68 #define current_cpu_data cpu_data[smp_processor_id()]
  69 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
  70
  71 extern void cpu_probe(void);
  72
  73 extern const char *__cpu_family[];
  74 extern const char *__cpu_full_name[];
  75 #define cpu_family_string()     __cpu_family[raw_smp_processor_id()]
  76 #define cpu_full_name_string()  __cpu_full_name[raw_smp_processor_id()]
  77
  78 struct seq_file;
  79 struct notifier_block;
  80
  81 extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
  82 extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
  83
  84 #define proc_cpuinfo_notifier(fn, pri)                                  \
  85 ({                                                                      \
  86         static struct notifier_block fn##_nb = {                        \
  87                 .notifier_call = fn,                                    \
  88                 .priority = pri                                         \
  89         };                                                              \
  90                                                                         \
  91         register_proc_cpuinfo_notifier(&fn##_nb);                       \
  92 })
  93
  94 struct proc_cpuinfo_notifier_args {
  95         struct seq_file *m;
  96         unsigned long n;
  97 };
  98
  99 static inline bool cpus_are_siblings(int cpua, int cpub)
 100 {
 101         struct cpuinfo_loongarch *infoa = &cpu_data[cpua];
 102         struct cpuinfo_loongarch *infob = &cpu_data[cpub];
 103
 104         if (infoa->package != infob->package)
 105                 return false;
 106
 107         if (infoa->core != infob->core)
 108                 return false;
 109
 110         return true;
 111 }
 112
 113 static inline unsigned long cpu_asid_mask(struct cpuinfo_loongarch *cpuinfo)
 114 {
 115         return cpuinfo->asid_mask;
 116 }
 117
 118 static inline void set_cpu_asid_mask(struct cpuinfo_loongarch *cpuinfo,
 119                                      unsigned long asid_mask)
 120 {
 121         cpuinfo->asid_mask = asid_mask;
 122 }
 123
 124 #endif /* __ASM_CPU_INFO_H */