1 /* 2 * ARM64 cacheinfo support 3 * 4 * Copyright (C) 2015 ARM Ltd. 5 * All Rights Reserved 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 12 * kind, whether express or implied; without even the implied warranty 13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/cacheinfo.h> 21 #include <linux/of.h> 22 23 #define MAX_CACHE_LEVEL 7 /* Max 7 level supported */ 24 /* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */ 25 #define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1)) 26 #define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level)) 27 #define CLIDR_CTYPE(clidr, level) \ 28 (((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level)) 29 30 static inline enum cache_type get_cache_type(int level) 31 { 32 u64 clidr; 33 34 if (level > MAX_CACHE_LEVEL) 35 return CACHE_TYPE_NOCACHE; 36 clidr = read_sysreg(clidr_el1); 37 return CLIDR_CTYPE(clidr, level); 38 } 39 40 static void ci_leaf_init(struct cacheinfo *this_leaf, 41 enum cache_type type, unsigned int level) 42 { 43 this_leaf->level = level; 44 this_leaf->type = type; 45 } 46 47 static int __init_cache_level(unsigned int cpu) 48 { 49 unsigned int ctype, level, leaves, of_level; 50 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); 51 52 for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) { 53 ctype = get_cache_type(level); 54 if (ctype == CACHE_TYPE_NOCACHE) { 55 level--; 56 break; 57 } 58 /* Separate instruction and data caches */ 59 leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1; 60 } 61 62 of_level = of_find_last_cache_level(cpu); 63 if (level < of_level) { 64 /* 65 * some external caches not specified in CLIDR_EL1 66 * the information may be available in the device tree 67 * only unified external caches are considered here 68 */ 69 leaves += (of_level - level); 70 level = of_level; 71 } 72 73 this_cpu_ci->num_levels = level; 74 this_cpu_ci->num_leaves = leaves; 75 return 0; 76 } 77 78 static int __populate_cache_leaves(unsigned int cpu) 79 { 80 unsigned int level, idx; 81 enum cache_type type; 82 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); 83 struct cacheinfo *this_leaf = this_cpu_ci->info_list; 84 85 for (idx = 0, level = 1; level <= this_cpu_ci->num_levels && 86 idx < this_cpu_ci->num_leaves; idx++, level++) { 87 type = get_cache_type(level); 88 if (type == CACHE_TYPE_SEPARATE) { 89 ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); 90 ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); 91 } else { 92 ci_leaf_init(this_leaf++, type, level); 93 } 94 } 95 return 0; 96 } 97 98 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level) 99 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves) 100