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/acpi.h> 21 #include <linux/cacheinfo.h> 22 #include <linux/of.h> 23 24 #define MAX_CACHE_LEVEL 7 /* Max 7 level supported */ 25 /* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */ 26 #define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1)) 27 #define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level)) 28 #define CLIDR_CTYPE(clidr, level) \ 29 (((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level)) 30 31 static inline enum cache_type get_cache_type(int level) 32 { 33 u64 clidr; 34 35 if (level > MAX_CACHE_LEVEL) 36 return CACHE_TYPE_NOCACHE; 37 clidr = read_sysreg(clidr_el1); 38 return CLIDR_CTYPE(clidr, level); 39 } 40 41 static void ci_leaf_init(struct cacheinfo *this_leaf, 42 enum cache_type type, unsigned int level) 43 { 44 this_leaf->level = level; 45 this_leaf->type = type; 46 } 47 48 static int __init_cache_level(unsigned int cpu) 49 { 50 unsigned int ctype, level, leaves, fw_level; 51 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); 52 53 for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) { 54 ctype = get_cache_type(level); 55 if (ctype == CACHE_TYPE_NOCACHE) { 56 level--; 57 break; 58 } 59 /* Separate instruction and data caches */ 60 leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1; 61 } 62 63 if (acpi_disabled) 64 fw_level = of_find_last_cache_level(cpu); 65 else 66 fw_level = acpi_find_last_cache_level(cpu); 67 68 if (level < fw_level) { 69 /* 70 * some external caches not specified in CLIDR_EL1 71 * the information may be available in the device tree 72 * only unified external caches are considered here 73 */ 74 leaves += (fw_level - level); 75 level = fw_level; 76 } 77 78 this_cpu_ci->num_levels = level; 79 this_cpu_ci->num_leaves = leaves; 80 return 0; 81 } 82 83 static int __populate_cache_leaves(unsigned int cpu) 84 { 85 unsigned int level, idx; 86 enum cache_type type; 87 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); 88 struct cacheinfo *this_leaf = this_cpu_ci->info_list; 89 90 for (idx = 0, level = 1; level <= this_cpu_ci->num_levels && 91 idx < this_cpu_ci->num_leaves; idx++, level++) { 92 type = get_cache_type(level); 93 if (type == CACHE_TYPE_SEPARATE) { 94 ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); 95 ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); 96 } else { 97 ci_leaf_init(this_leaf++, type, level); 98 } 99 } 100 return 0; 101 } 102 103 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level) 104 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves) 105