Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172// SPDX-License-Identifier: GPL-2.0/* * Extract CPU cache information and expose them via sysfs. * * Copyright IBM Corp. 2012 */
#include <linux/seq_file.h>#include <linux/cpu.h>#include <linux/cacheinfo.h>#include <asm/facility.h>
enum { CACHE_SCOPE_NOTEXISTS, CACHE_SCOPE_PRIVATE, CACHE_SCOPE_SHARED, CACHE_SCOPE_RESERVED,};
enum { CTYPE_SEPARATE, CTYPE_DATA, CTYPE_INSTRUCTION, CTYPE_UNIFIED,};
enum { EXTRACT_TOPOLOGY, EXTRACT_LINE_SIZE, EXTRACT_SIZE, EXTRACT_ASSOCIATIVITY,};
enum { CACHE_TI_UNIFIED = 0, CACHE_TI_DATA = 0, CACHE_TI_INSTRUCTION,};
struct cache_info { unsigned char : 4; unsigned char scope : 2; unsigned char type : 2;};
#define CACHE_MAX_LEVEL 8union cache_topology { struct cache_info ci[CACHE_MAX_LEVEL]; unsigned long raw;};
static const char * const cache_type_string[] = { "", "Instruction", "Data", "", "Unified",};
static const enum cache_type cache_type_map[] = { [CTYPE_SEPARATE] = CACHE_TYPE_SEPARATE, [CTYPE_DATA] = CACHE_TYPE_DATA, [CTYPE_INSTRUCTION] = CACHE_TYPE_INST, [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,};
void show_cacheinfo(struct seq_file *m){ struct cpu_cacheinfo *this_cpu_ci; struct cacheinfo *cache; int idx;
this_cpu_ci = get_cpu_cacheinfo(cpumask_any(cpu_online_mask)); for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) { cache = this_cpu_ci->info_list + idx; seq_printf(m, "cache%-11d: ", idx); seq_printf(m, "level=%d ", cache->level); seq_printf(m, "type=%s ", cache_type_string[cache->type]); seq_printf(m, "scope=%s ", cache->disable_sysfs ? "Shared" : "Private"); seq_printf(m, "size=%dK ", cache->size >> 10); seq_printf(m, "line_size=%u ", cache->coherency_line_size); seq_printf(m, "associativity=%d", cache->ways_of_associativity); seq_puts(m, "\n"); }}
static inline enum cache_type get_cache_type(struct cache_info *ci, int level){ if (level >= CACHE_MAX_LEVEL) return CACHE_TYPE_NOCACHE; ci += level; if (ci->scope != CACHE_SCOPE_SHARED && ci->scope != CACHE_SCOPE_PRIVATE) return CACHE_TYPE_NOCACHE; return cache_type_map[ci->type];}
static inline unsigned long ecag(int ai, int li, int ti){ return __ecag(ECAG_CACHE_ATTRIBUTE, ai << 4 | li << 1 | ti);}
static void ci_leaf_init(struct cacheinfo *this_leaf, int private, enum cache_type type, unsigned int level, int cpu){ int ti, num_sets;
if (type == CACHE_TYPE_INST) ti = CACHE_TI_INSTRUCTION; else ti = CACHE_TI_UNIFIED; this_leaf->level = level + 1; this_leaf->type = type; this_leaf->coherency_line_size = ecag(EXTRACT_LINE_SIZE, level, ti); this_leaf->ways_of_associativity = ecag(EXTRACT_ASSOCIATIVITY, level, ti); this_leaf->size = ecag(EXTRACT_SIZE, level, ti); num_sets = this_leaf->size / this_leaf->coherency_line_size; num_sets /= this_leaf->ways_of_associativity; this_leaf->number_of_sets = num_sets; cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map); if (!private) this_leaf->disable_sysfs = true;}
int init_cache_level(unsigned int cpu){ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); unsigned int level = 0, leaves = 0; union cache_topology ct; enum cache_type ctype;
if (!this_cpu_ci) return -EINVAL; ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0); do { ctype = get_cache_type(&ct.ci[0], level); if (ctype == CACHE_TYPE_NOCACHE) break; /* Separate instruction and data caches */ leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1; } while (++level < CACHE_MAX_LEVEL); this_cpu_ci->num_levels = level; this_cpu_ci->num_leaves = leaves; return 0;}
int populate_cache_leaves(unsigned int cpu){ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); struct cacheinfo *this_leaf = this_cpu_ci->info_list; unsigned int level, idx, pvt; union cache_topology ct; enum cache_type ctype;
ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0); for (idx = 0, level = 0; level < this_cpu_ci->num_levels && idx < this_cpu_ci->num_leaves; idx++, level++) { if (!this_leaf) return -EINVAL; pvt = (ct.ci[level].scope == CACHE_SCOPE_PRIVATE) ? 1 : 0; ctype = get_cache_type(&ct.ci[0], level); if (ctype == CACHE_TYPE_SEPARATE) { ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_DATA, level, cpu); ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_INST, level, cpu); } else { ci_leaf_init(this_leaf++, pvt, ctype, level, cpu); } } this_cpu_ci->cpu_map_populated = true; return 0;}