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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 SiFive
*/
#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <asm/cacheinfo.h>
static struct riscv_cacheinfo_ops *rv_cache_ops;
void riscv_set_cacheinfo_ops(struct riscv_cacheinfo_ops *ops)
{
rv_cache_ops = ops;
}
EXPORT_SYMBOL_GPL(riscv_set_cacheinfo_ops);
const struct attribute_group *
cache_get_priv_group(struct cacheinfo *this_leaf)
{
if (rv_cache_ops && rv_cache_ops->get_priv_group)
return rv_cache_ops->get_priv_group(this_leaf);
return NULL;
}
static struct cacheinfo *get_cacheinfo(u32 level, enum cache_type type)
{
/*
* Using raw_smp_processor_id() elides a preemptability check, but this
* is really indicative of a larger problem: the cacheinfo UABI assumes
* that cores have a homonogenous view of the cache hierarchy. That
* happens to be the case for the current set of RISC-V systems, but
* likely won't be true in general. Since there's no way to provide
* correct information for these systems via the current UABI we're
* just eliding the check for now.
*/
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(raw_smp_processor_id());
struct cacheinfo *this_leaf;
int index;
for (index = 0; index < this_cpu_ci->num_leaves; index++) {
this_leaf = this_cpu_ci->info_list + index;
if (this_leaf->level == level && this_leaf->type == type)
return this_leaf;
}
return NULL;
}
uintptr_t get_cache_size(u32 level, enum cache_type type)
{
struct cacheinfo *this_leaf = get_cacheinfo(level, type);
return this_leaf ? this_leaf->size : 0;
}
uintptr_t get_cache_geometry(u32 level, enum cache_type type)
{
struct cacheinfo *this_leaf = get_cacheinfo(level, type);
return this_leaf ? (this_leaf->ways_of_associativity << 16 |
this_leaf->coherency_line_size) :
0;
}
static void ci_leaf_init(struct cacheinfo *this_leaf,
enum cache_type type, unsigned int level)
{
this_leaf->level = level;
this_leaf->type = type;
}
int init_cache_level(unsigned int cpu)
{
return init_of_cache_level(cpu);
}
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;
struct device_node *np, *prev;
int levels = 1, level = 1;
if (!acpi_disabled) {
int ret, fw_levels, split_levels;
ret = acpi_get_cache_info(cpu, &fw_levels, &split_levels);
if (ret)
return ret;
BUG_ON((split_levels > fw_levels) ||
(split_levels + fw_levels > this_cpu_ci->num_leaves));
for (; level <= this_cpu_ci->num_levels; level++) {
if (level <= split_levels) {
ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
} else {
ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level);
}
}
return 0;
}
np = of_cpu_device_node_get(cpu);
if (!np)
return -ENOENT;
if (of_property_read_bool(np, "cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level);
if (of_property_read_bool(np, "i-cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
if (of_property_read_bool(np, "d-cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
prev = np;
while ((np = of_find_next_cache_node(np))) {
of_node_put(prev);
prev = np;
if (!of_device_is_compatible(np, "cache"))
break;
if (of_property_read_u32(np, "cache-level", &level))
break;
if (level <= levels)
break;
if (of_property_read_bool(np, "cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_UNIFIED, level);
if (of_property_read_bool(np, "i-cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
if (of_property_read_bool(np, "d-cache-size"))
ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
levels = level;
}
of_node_put(np);
return 0;
}
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