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LoongArch: Get correct cores_per_package for SMT systems

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In loongson_sysconf, The "core" of cores_per_node and cores_per_package
stands for a logical core, which means in a SMT system it stands for a
thread indeed. This information is gotten from SMBIOS Type4 Structure,
so in order to get a correct cores_per_package for both SMT and non-SMT
systems in parse_cpu_table() we should use SMBIOS_THREAD_PACKAGE_OFFSET
instead of SMBIOS_CORE_PACKAGE_OFFSET.

Cc: stable@vger.kernel.org
Reported-by: Chao Li <lichao@loongson.cn>
Tested-by: Chao Li <lichao@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen
2024-10-21 22:11:18 +08:00
parent b69269c870
commit b7296f9d5b
2 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/loongarch/include/asm/bootinfo.h
View File

@@ -26,6 +26,10 @@ struct loongson_board_info {
#define NR_WORDS DIV_ROUND_UP(NR_CPUS, BITS_PER_LONG)
/*
* The "core" of cores_per_node and cores_per_package stands for a
* logical core, which means in a SMT system it stands for a thread.
*/
struct loongson_system_configuration {
int nr_cpus;
int nr_nodes;

3
arch/loongarch/kernel/setup.c
View File

@@ -55,6 +55,7 @@
#define SMBIOS_FREQHIGH_OFFSET 0x17
#define SMBIOS_FREQLOW_MASK 0xFF
#define SMBIOS_CORE_PACKAGE_OFFSET 0x23
#define SMBIOS_THREAD_PACKAGE_OFFSET 0x25
#define LOONGSON_EFI_ENABLE (1 << 3)
unsigned long fw_arg0, fw_arg1, fw_arg2;
@@ -125,7 +126,7 @@ static void __init parse_cpu_table(const struct dmi_header *dm)
cpu_clock_freq = freq_temp * 1000000;
loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_THREAD_PACKAGE_OFFSET);
pr_info("CpuClock = %llu\n", cpu_clock_freq);
}