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| author | Huacai Chen <chenhuacai@loongson.cn> | 2024-02-06 12:32:05 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-02-06 12:32:05 +0800 |
| commit | 4551b30525cf3d2f026b92401ffe241eb04dfebe (patch) | |
| tree | 4e1df7e08f16cfc11166973658c77e292b63c980 /arch/loongarch | |
| parent | 6b79ecd084c99b31c8b4d0beda08893716d5558e (diff) | |
| download | linux-4551b30525cf3d2f026b92401ffe241eb04dfebe.tar.gz linux-4551b30525cf3d2f026b92401ffe241eb04dfebe.tar.bz2 linux-4551b30525cf3d2f026b92401ffe241eb04dfebe.zip | |
LoongArch: Change acpi_core_pic[NR_CPUS] to acpi_core_pic[MAX_CORE_PIC]
With default config, the value of NR_CPUS is 64. When HW platform has
more then 64 cpus, system will crash on these platforms. MAX_CORE_PIC
is the maximum cpu number in MADT table (max physical number) which can
exceed the supported maximum cpu number (NR_CPUS, max logical number),
but kernel should not crash. Kernel should boot cpus with NR_CPUS, let
the remainder cpus stay in BIOS.
The potential crash reason is that the array acpi_core_pic[NR_CPUS] can
be overflowed when parsing MADT table, and it is obvious that CORE_PIC
should be corresponding to physical core rather than logical core, so it
is better to define the array as acpi_core_pic[MAX_CORE_PIC].
With the patch, system can boot up 64 vcpus with qemu parameter -smp 128,
otherwise system will crash with the following message.
[ 0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000420000004259, era == 90000000037a5f0c, ra == 90000000037a46ec
[ 0.000000] Oops[#1]:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-rc2+ #192
[ 0.000000] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 2/2/2022
[ 0.000000] pc 90000000037a5f0c ra 90000000037a46ec tp 9000000003c90000 sp 9000000003c93d60
[ 0.000000] a0 0000000000000019 a1 9000000003d93bc0 a2 0000000000000000 a3 9000000003c93bd8
[ 0.000000] a4 9000000003c93a74 a5 9000000083c93a67 a6 9000000003c938f0 a7 0000000000000005
[ 0.000000] t0 0000420000004201 t1 0000000000000000 t2 0000000000000001 t3 0000000000000001
[ 0.000000] t4 0000000000000003 t5 0000000000000000 t6 0000000000000030 t7 0000000000000063
[ 0.000000] t8 0000000000000014 u0 ffffffffffffffff s9 0000000000000000 s0 9000000003caee98
[ 0.000000] s1 90000000041b0480 s2 9000000003c93da0 s3 9000000003c93d98 s4 9000000003c93d90
[ 0.000000] s5 9000000003caa000 s6 000000000a7fd000 s7 000000000f556b60 s8 000000000e0a4330
[ 0.000000] ra: 90000000037a46ec platform_init+0x214/0x250
[ 0.000000] ERA: 90000000037a5f0c efi_runtime_init+0x30/0x94
[ 0.000000] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
[ 0.000000] PRMD: 00000000 (PPLV0 -PIE -PWE)
[ 0.000000] EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
[ 0.000000] ECFG: 00070800 (LIE=11 VS=7)
[ 0.000000] ESTAT: 00010000 [PIL] (IS= ECode=1 EsubCode=0)
[ 0.000000] BADV: 0000420000004259
[ 0.000000] PRID: 0014c010 (Loongson-64bit, Loongson-3A5000)
[ 0.000000] Modules linked in:
[ 0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____))
[ 0.000000] Stack : 9000000003c93a14 9000000003800898 90000000041844f8 90000000037a46ec
[ 0.000000] 000000000a7fd000 0000000008290000 0000000000000000 0000000000000000
[ 0.000000] 0000000000000000 0000000000000000 00000000019d8000 000000000f556b60
[ 0.000000] 000000000a7fd000 000000000f556b08 9000000003ca7700 9000000003800000
[ 0.000000] 9000000003c93e50 9000000003800898 9000000003800108 90000000037a484c
[ 0.000000] 000000000e0a4330 000000000f556b60 000000000a7fd000 000000000f556b08
[ 0.000000] 9000000003ca7700 9000000004184000 0000000000200000 000000000e02b018
[ 0.000000] 000000000a7fd000 90000000037a0790 9000000003800108 0000000000000000
[ 0.000000] 0000000000000000 000000000e0a4330 000000000f556b60 000000000a7fd000
[ 0.000000] 000000000f556b08 000000000eaae298 000000000eaa5040 0000000000200000
[ 0.000000] ...
[ 0.000000] Call Trace:
[ 0.000000] [<90000000037a5f0c>] efi_runtime_init+0x30/0x94
[ 0.000000] [<90000000037a46ec>] platform_init+0x214/0x250
[ 0.000000] [<90000000037a484c>] setup_arch+0x124/0x45c
[ 0.000000] [<90000000037a0790>] start_kernel+0x90/0x670
[ 0.000000] [<900000000378b0d8>] kernel_entry+0xd8/0xdc
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
| -rw-r--r-- | arch/loongarch/include/asm/acpi.h | 4 | ||||
| -rw-r--r-- | arch/loongarch/kernel/acpi.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h index 8de6c4b83a61..49e29b29996f 100644 --- a/arch/loongarch/include/asm/acpi.h +++ b/arch/loongarch/include/asm/acpi.h @@ -32,8 +32,10 @@ static inline bool acpi_has_cpu_in_madt(void) return true; } +#define MAX_CORE_PIC 256 + extern struct list_head acpi_wakeup_device_list; -extern struct acpi_madt_core_pic acpi_core_pic[NR_CPUS]; +extern struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC]; extern int __init parse_acpi_topology(void); diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c index b6b097bbf866..5cf59c617126 100644 --- a/arch/loongarch/kernel/acpi.c +++ b/arch/loongarch/kernel/acpi.c @@ -29,11 +29,9 @@ int disabled_cpus; u64 acpi_saved_sp; -#define MAX_CORE_PIC 256 - #define PREFIX "ACPI: " -struct acpi_madt_core_pic acpi_core_pic[NR_CPUS]; +struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC]; void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size) { |