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 */
125
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