cregit-Linux how code gets into the kernel

Release 4.14 arch/s390/kernel/cache.c

Directory: arch/s390/kernel
// SPDX-License-Identifier: GPL-2.0
/*
 * Extract CPU cache information and expose them via sysfs.
 *
 *    Copyright IBM Corp. 2012
 *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#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 8

union cache_topology {
	
struct cache_info ci[CACHE_MAX_LEVEL];
	
unsigned long 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; if (!test_facility(34)) return; 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"); } }

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Heiko Carstens11874.68%375.00%
Sudeep Holla4025.32%125.00%
Total158100.00%4100.00%


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]; }

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static inline unsigned long ecag(int ai, int li, int ti) { return __ecag(ECAG_CACHE_ATTRIBUTE, ai << 4 | li << 1 | ti); }

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Heiko Carstens33100.00%2100.00%
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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; }

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Heiko Carstens7452.48%480.00%
Sudeep Holla6747.52%120.00%
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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 (!test_facility(34)) return -EOPNOTSUPP; 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; }

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Sudeep Holla10982.58%125.00%
Heiko Carstens2317.42%375.00%
Total132100.00%4100.00%


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; if (!test_facility(34)) return -EOPNOTSUPP; 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); } } return 0; }

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Heiko Carstens11156.06%583.33%
Sudeep Holla8743.94%116.67%
Total198100.00%6100.00%


Overall Contributors

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Heiko Carstens47454.36%981.82%
Sudeep Holla39745.53%19.09%
Greg Kroah-Hartman10.11%19.09%
Total872100.00%11100.00%
Directory: arch/s390/kernel
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