^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Extract CPU cache information and expose them via sysfs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/cacheinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/facility.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) CACHE_SCOPE_NOTEXISTS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) CACHE_SCOPE_PRIVATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) CACHE_SCOPE_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) CACHE_SCOPE_RESERVED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) CTYPE_SEPARATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) CTYPE_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) CTYPE_INSTRUCTION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) CTYPE_UNIFIED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) EXTRACT_TOPOLOGY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) EXTRACT_LINE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) EXTRACT_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) EXTRACT_ASSOCIATIVITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) CACHE_TI_UNIFIED = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) CACHE_TI_DATA = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) CACHE_TI_INSTRUCTION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct cache_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned char : 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned char scope : 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned char type : 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define CACHE_MAX_LEVEL 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) union cache_topology {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct cache_info ci[CACHE_MAX_LEVEL];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long long raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static const char * const cache_type_string[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) "Instruction",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) "Data",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) "Unified",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static const enum cache_type cache_type_map[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) [CTYPE_SEPARATE] = CACHE_TYPE_SEPARATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) [CTYPE_DATA] = CACHE_TYPE_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) [CTYPE_INSTRUCTION] = CACHE_TYPE_INST,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) void show_cacheinfo(struct seq_file *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct cpu_cacheinfo *this_cpu_ci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct cacheinfo *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!test_facility(34))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) this_cpu_ci = get_cpu_cacheinfo(cpumask_any(cpu_online_mask));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) cache = this_cpu_ci->info_list + idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) seq_printf(m, "cache%-11d: ", idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) seq_printf(m, "level=%d ", cache->level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) seq_printf(m, "type=%s ", cache_type_string[cache->type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) seq_printf(m, "scope=%s ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) cache->disable_sysfs ? "Shared" : "Private");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) seq_printf(m, "size=%dK ", cache->size >> 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) seq_printf(m, "line_size=%u ", cache->coherency_line_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) seq_printf(m, "associativity=%d", cache->ways_of_associativity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) seq_puts(m, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static inline enum cache_type get_cache_type(struct cache_info *ci, int level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (level >= CACHE_MAX_LEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return CACHE_TYPE_NOCACHE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ci += level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (ci->scope != CACHE_SCOPE_SHARED && ci->scope != CACHE_SCOPE_PRIVATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return CACHE_TYPE_NOCACHE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return cache_type_map[ci->type];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static inline unsigned long ecag(int ai, int li, int ti)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return __ecag(ECAG_CACHE_ATTRIBUTE, ai << 4 | li << 1 | ti);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static void ci_leaf_init(struct cacheinfo *this_leaf, int private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) enum cache_type type, unsigned int level, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int ti, num_sets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (type == CACHE_TYPE_INST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ti = CACHE_TI_INSTRUCTION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ti = CACHE_TI_UNIFIED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) this_leaf->level = level + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) this_leaf->type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) this_leaf->coherency_line_size = ecag(EXTRACT_LINE_SIZE, level, ti);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) this_leaf->ways_of_associativity = ecag(EXTRACT_ASSOCIATIVITY, level, ti);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) this_leaf->size = ecag(EXTRACT_SIZE, level, ti);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) num_sets = this_leaf->size / this_leaf->coherency_line_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) num_sets /= this_leaf->ways_of_associativity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) this_leaf->number_of_sets = num_sets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) this_leaf->disable_sysfs = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int init_cache_level(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned int level = 0, leaves = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) union cache_topology ct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) enum cache_type ctype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (!test_facility(34))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!this_cpu_ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ctype = get_cache_type(&ct.ci[0], level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ctype == CACHE_TYPE_NOCACHE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /* Separate instruction and data caches */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) } while (++level < CACHE_MAX_LEVEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) this_cpu_ci->num_levels = level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) this_cpu_ci->num_leaves = leaves;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int populate_cache_leaves(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct cacheinfo *this_leaf = this_cpu_ci->info_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) unsigned int level, idx, pvt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) union cache_topology ct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) enum cache_type ctype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (!test_facility(34))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) for (idx = 0, level = 0; level < this_cpu_ci->num_levels &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) idx < this_cpu_ci->num_leaves; idx++, level++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (!this_leaf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) pvt = (ct.ci[level].scope == CACHE_SCOPE_PRIVATE) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) ctype = get_cache_type(&ct.ci[0], level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (ctype == CACHE_TYPE_SEPARATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_DATA, level, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_INST, level, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ci_leaf_init(this_leaf++, pvt, ctype, level, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags