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LoongArch: Parsing CPU-related information from DTS

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Generally, we can get cpu-related information, such as model name, from
/proc/cpuinfo. For FDT-based systems, we need to parse the relevant
information from DTS.

BTW, set loongson_sysconf.cores_per_package to num_processors if SMBIOS
doesn't provide a valid number (usually FDT-based systems).

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Hongliang Wang <wanghongliang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Binbin Zhou 2024-01-17 12:43:08 +08:00 • committed by Huacai Chen
parent 2905844f68
commit 44a01f1f72
2 changed files with 36 additions and 1 deletions
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34
arch/loongarch/kernel/env.c
View file

@ -5,13 +5,16 @@
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/efi.h>
#include <linux/export.h>
#include <linux/memblock.h>
#include <linux/of_clk.h>
#include <asm/early_ioremap.h>
#include <asm/bootinfo.h>
#include <asm/loongson.h>
#include <asm/setup.h>
#include <asm/time.h>
u64 efi_system_table;
struct loongson_system_configuration loongson_sysconf;
@ -36,7 +39,16 @@ void __init init_environ(void)
static int __init init_cpu_fullname(void)
{
int cpu;
struct device_node *root;
int cpu, ret;
char *model;
/* Parsing cpuname from DTS model property */
root = of_find_node_by_path("/");
ret = of_property_read_string(root, "model", (const char **)&model);
of_node_put(root);
if (ret == 0)
loongson_sysconf.cpuname = strsep(&model, " ");
if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
for (cpu = 0; cpu < NR_CPUS; cpu++)
@ -46,6 +58,26 @@ static int __init init_cpu_fullname(void)
}
arch_initcall(init_cpu_fullname);
static int __init fdt_cpu_clk_init(void)
{
struct clk *clk;
struct device_node *np;
np = of_get_cpu_node(0, NULL);
if (!np)
return -ENODEV;
clk = of_clk_get(np, 0);
if (IS_ERR(clk))
return -ENODEV;
cpu_clock_freq = clk_get_rate(clk);
clk_put(clk);
return 0;
}
late_initcall(fdt_cpu_clk_init);
static ssize_t boardinfo_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{

3
arch/loongarch/kernel/smp.c
View file

@ -216,6 +216,9 @@ void __init loongson_smp_setup(void)
{
fdt_smp_setup();
if (loongson_sysconf.cores_per_package == 0)
loongson_sysconf.cores_per_package = num_processors;
cpu_data[0].core = cpu_logical_map(0) % loongson_sysconf.cores_per_package;
cpu_data[0].package = cpu_logical_map(0) / loongson_sysconf.cores_per_package;