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LoongArch: Correct the calculation logic of thread_count

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For thread_count, the current calculation method has a maximum of 255,
which may not be sufficient in the future. Therefore, we are correcting
it now.

Reference: SMBIOS Specification, 7.5 Processor Information (Type 4)[1]

[1]: https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.9.0.pdf

Cc: stable@vger.kernel.org
Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Qiang Ma 2025-12-06 10:39:49 +08:00 committed by Huacai Chen
parent a258a3cb18
commit 1de0ae21f1
1 changed files with 7 additions and 1 deletions
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8
arch/loongarch/kernel/setup.c
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@ -56,6 +56,7 @@
#define SMBIOS_FREQLOW_MASK 0xFF
#define SMBIOS_CORE_PACKAGE_OFFSET 0x23
#define SMBIOS_THREAD_PACKAGE_OFFSET 0x25
#define SMBIOS_THREAD_PACKAGE_2_OFFSET 0x2E
#define LOONGSON_EFI_ENABLE (1 << 3)
unsigned long fw_arg0, fw_arg1, fw_arg2;
@ -126,7 +127,12 @@ 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_THREAD_PACKAGE_OFFSET);
loongson_sysconf.cores_per_package = *(u8 *)(dmi_data + SMBIOS_THREAD_PACKAGE_OFFSET);
if (dm->length >= 0x30 && loongson_sysconf.cores_per_package == 0xff) {
/* SMBIOS 3.0+ has ThreadCount2 for more than 255 threads */
loongson_sysconf.cores_per_package =
*(u16 *)(dmi_data + SMBIOS_THREAD_PACKAGE_2_OFFSET);
}
pr_info("CpuClock = %llu\n", cpu_clock_freq);
}