1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017 SiFive 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/cpu.h> 8 #include <linux/of.h> 9 #include <asm/cacheinfo.h> 10 11 static struct riscv_cacheinfo_ops *rv_cache_ops; 12 13 void riscv_set_cacheinfo_ops(struct riscv_cacheinfo_ops *ops) 14 { 15 rv_cache_ops = ops; 16 } 17 EXPORT_SYMBOL_GPL(riscv_set_cacheinfo_ops); 18 19 const struct attribute_group * 20 cache_get_priv_group(struct cacheinfo *this_leaf) 21 { 22 if (rv_cache_ops && rv_cache_ops->get_priv_group) 23 return rv_cache_ops->get_priv_group(this_leaf); 24 return NULL; 25 } 26 27 static struct cacheinfo *get_cacheinfo(u32 level, enum cache_type type) 28 { 29 /* 30 * Using raw_smp_processor_id() elides a preemptability check, but this 31 * is really indicative of a larger problem: the cacheinfo UABI assumes 32 * that cores have a homonogenous view of the cache hierarchy. That 33 * happens to be the case for the current set of RISC-V systems, but 34 * likely won't be true in general. Since there's no way to provide 35 * correct information for these systems via the current UABI we're 36 * just eliding the check for now. 37 */ 38 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(raw_smp_processor_id()); 39 struct cacheinfo *this_leaf; 40 int index; 41 42 for (index = 0; index < this_cpu_ci->num_leaves; index++) { 43 this_leaf = this_cpu_ci->info_list + index; 44 if (this_leaf->level == level && this_leaf->type == type) 45 return this_leaf; 46 } 47 48 return NULL; 49 } 50 51 uintptr_t get_cache_size(u32 level, enum cache_type type) 52 { 53 struct cacheinfo *this_leaf = get_cacheinfo(level, type); 54 55 return this_leaf ? this_leaf->size : 0; 56 } 57 58 uintptr_t get_cache_geometry(u32 level, enum cache_type type) 59 { 60 struct cacheinfo *this_leaf = get_cacheinfo(level, type); 61 62 return this_leaf ? (this_leaf->ways_of_associativity << 16 | 63 this_leaf->coherency_line_size) : 64 0; 65 } 66 67 static void ci_leaf_init(struct cacheinfo *this_leaf, 68 enum cache_type type, unsigned int level) 69 { 70 this_leaf->level = level; 71 this_leaf->type = type; 72 } 73 74 int populate_cache_leaves(unsigned int cpu) 75 { 76 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); 77 struct cacheinfo *this_leaf = this_cpu_ci->info_list; 78 struct device_node *np = of_cpu_device_node_get(cpu); 79 struct device_node *prev = NULL; 80 int levels = 1, level = 1; 81 82 if (!acpi_disabled) { 83 int ret, fw_levels, split_levels; 84 85 ret = acpi_get_cache_info(cpu, &fw_levels, &split_levels); 86 if (ret) 87 return ret; 88 89 BUG_ON((split_levels > fw_levels) || 90 (split_levels + fw_levels > this_cpu_ci->num_leaves)); 91 92 for (; level <= this_cpu_ci->num_levels; level++) { 93 if (level <= split_levels) { 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++, CACHE_TYPE_UNIFIED, level); 98 } 99 } 100 return 0; 101 } 102 103 if (of_property_read_bool(np, "cache-size")) 104 ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); 105 if (of_property_read_bool(np, "i-cache-size")) 106 ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); 107 if (of_property_read_bool(np, "d-cache-size")) 108 ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); 109 110 prev = np; 111 while ((np = of_find_next_cache_node(np))) { 112 of_node_put(prev); 113 prev = np; 114 if (!of_device_is_compatible(np, "cache")) 115 break; 116 if (of_property_read_u32(np, "cache-level", &level)) 117 break; 118 if (level <= levels) 119 break; 120 if (of_property_read_bool(np, "cache-size")) 121 ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level); 122 if (of_property_read_bool(np, "i-cache-size")) 123 ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level); 124 if (of_property_read_bool(np, "d-cache-size")) 125 ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level); 126 levels = level; 127 } 128 of_node_put(np); 129 130 return 0; 131 } 132