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LoongArch: Get correct cores_per_package for SMT systems

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BugLink: https://bugs.launchpad.net/bugs/2097575

commit b7296f9d5bf99330063d4bbecc43c9b33fed0137 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Huacai Chen
2024-10-21 22:11:18 +08:00
committed by Stefan Bader
parent 3369116af4
commit d627bf8f79
2 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/loongarch/include/asm/bootinfo.h
+4
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;
arch/loongarch/kernel/setup.c
+2 -1
View File
@@ -54,6 +54,7 @@
#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;
@@ -124,7 +125,7 @@ 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);
}