1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ARM64 cacheinfo support
4 *
5 * Copyright (C) 2015 ARM Ltd.
6 * All Rights Reserved
7 */
8
9 #include <linux/acpi.h>
10 #include <linux/cacheinfo.h>
11 #include <linux/of.h>
12
13 #define MAX_CACHE_LEVEL 7 /* Max 7 level supported */
14
cache_line_size(void)15 int cache_line_size(void)
16 {
17 if (coherency_max_size != 0)
18 return coherency_max_size;
19
20 return cache_line_size_of_cpu();
21 }
22 EXPORT_SYMBOL_GPL(cache_line_size);
23
get_cache_type(int level)24 static inline enum cache_type get_cache_type(int level)
25 {
26 u64 clidr;
27
28 if (level > MAX_CACHE_LEVEL)
29 return CACHE_TYPE_NOCACHE;
30 clidr = read_sysreg(clidr_el1);
31 return CLIDR_CTYPE(clidr, level);
32 }
33
ci_leaf_init(struct cacheinfo * this_leaf,enum cache_type type,unsigned int level)34 static void ci_leaf_init(struct cacheinfo *this_leaf,
35 enum cache_type type, unsigned int level)
36 {
37 this_leaf->level = level;
38 this_leaf->type = type;
39 }
40
init_cache_level(unsigned int cpu)41 int init_cache_level(unsigned int cpu)
42 {
43 unsigned int ctype, level, leaves;
44 int fw_level, ret;
45 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
46
47 for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) {
48 ctype = get_cache_type(level);
49 if (ctype == CACHE_TYPE_NOCACHE) {
50 level--;
51 break;
52 }
53 /* Separate instruction and data caches */
54 leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
55 }
56
57 if (acpi_disabled) {
58 fw_level = of_find_last_cache_level(cpu);
59 } else {
60 ret = acpi_get_cache_info(cpu, &fw_level, NULL);
61 if (ret < 0)
62 fw_level = 0;
63 }
64
65 if (level < fw_level) {
66 /*
67 * some external caches not specified in CLIDR_EL1
68 * the information may be available in the device tree
69 * only unified external caches are considered here
70 */
71 leaves += (fw_level - level);
72 level = fw_level;
73 }
74
75 this_cpu_ci->num_levels = level;
76 this_cpu_ci->num_leaves = leaves;
77 return 0;
78 }
79
populate_cache_leaves(unsigned int cpu)80 int populate_cache_leaves(unsigned int cpu)
81 {
82 unsigned int level, idx;
83 enum cache_type type;
84 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
85 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
86
87 for (idx = 0, level = 1; level <= this_cpu_ci->num_levels &&
88 idx < this_cpu_ci->num_leaves; idx++, level++) {
89 type = get_cache_type(level);
90 if (type == CACHE_TYPE_SEPARATE) {
91 ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
92 ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
93 } else {
94 ci_leaf_init(this_leaf++, type, level);
95 }
96 }
97 return 0;
98 }
99