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5685d7fc |
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13-May-2024 |
Tiezhu Yang <yangtiezhu@loongson.cn> |
LoongArch: Give a chance to build with !CONFIG_SMP In the current code, SMP is selected in Kconfig for LoongArch, the users can not unset it, this is reasonable for a multi-processor machine. But as the help info of config SMP said, if you have a system with only one CPU, say N. On a uni-processor machine, the kernel will run faster if you say N here. Loongson-2K0500 is a single-core CPU for applications like industrial control, printing terminals, and BMC (Baseboard Management Controller), there are many development boards, products and solutions on the market, so it is better and necessary to give a chance to build with !CONFIG_SMP for a uni-processor machine. First of all, do not select SMP for config LOONGARCH in Kconfig to make it possible to unset CONFIG_SMP. Then, do some changes to fix warnings and errors if CONFIG_SMP is not set. (1) Define get_ipi_irq() only if CONFIG_SMP is set to fix the warning: arch/loongarch/kernel/irq.c:90:19: warning: 'get_ipi_irq' defined but not used [-Wunused-function] (2) Add "#ifdef CONFIG_SMP" in asm/smp.h to fix the warning: ./arch/loongarch/include/asm/smp.h:49:9: warning: "raw_smp_processor_id" redefined 49 | #define raw_smp_processor_id raw_smp_processor_id | ^~~~~~~~~~~~~~~~~~~~ ./include/linux/smp.h:198:9: note: this is the location of the previous definition 198 | #define raw_smp_processor_id() 0 (3) Define machine_shutdown() as empty under !CONFIG_SMP to fix the error: arch/loongarch/kernel/machine_kexec.c: In function 'machine_shutdown': arch/loongarch/kernel/machine_kexec.c:233:25: error: implicit declaration of function 'cpu_device_up'; did you mean 'put_device'? [-Wimplicit-function-declaration] (4) Make config SCHED_SMT depends on SMP to fix many errors such as: kernel/sched/core.c: In function 'sched_core_find': kernel/sched/core.c:310:43: error: 'struct rq' has no member named 'cpu' (5) Define cpu_logical_map(cpu) as 0 under !CONFIG_SMP in asm/smp.h, then include asm/smp.h in asm/acpi.h (because acpi.h is included in linux/irq.h indirectly) to fix many build errors under drivers/irqchip such as: drivers/irqchip/irq-loongson-eiointc.c: In function 'cpu_to_eio_node': drivers/irqchip/irq-loongson-eiointc.c:59:16: error: implicit declaration of function 'cpu_logical_map' [-Wimplicit-function-declaration] (6) Do not write per_cpu_offset(0) to PERCPU_BASE_KS when resume because the per_cpu_offset(x) macro is defined as (__per_cpu_offset[x]) only under CONFIG_SMP in include/asm-generic/percpu.h. Just save the value of PERCPU_BASE_KS when suspend and restore it when resume to fix the error: arch/loongarch/power/suspend.c: In function 'loongarch_common_resume': arch/loongarch/power/suspend.c:47:21: error: implicit declaration of function 'per_cpu_offset' [-Wimplicit-function-declaration] (7) Fix huge page handling under !CONFIG_SMP in tlbex.S. When running the UnixBench tests with "-c 1" single-streamed pass, the improvement of performance is about 9 percent with this patch. By the way, it is helpful to debug and analysis the kernel issues of multi-processor system under !CONFIG_SMP. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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4551b305 |
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05-Feb-2024 |
Huacai Chen <chenhuacai@kernel.org> |
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>
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31f1a8b0 |
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29-Jun-2023 |
Yinbo Zhu <zhuyinbo@loongson.cn> |
LoongArch: Export some arch-specific pm interfaces Some PMC (Power Management Controllers) need to support DTS and will use the suspend interfaces thus this patch was to export such interfaces for their use. Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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f6f0c9a7 |
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29-Jun-2023 |
Huacai Chen <chenhuacai@kernel.org> |
LoongArch: Add SMT (Simultaneous Multi-Threading) support Loongson-3A6000 has SMT (Simultaneous Multi-Threading) support, each physical core has two logical cores (threads). This patch add SMT probe and scheduler support via ACPI PPTT. If SCHED_SMT enabled, Loongson-3A6000 is treated as 4 cores, 8 threads; If SCHED_SMT disabled, Loongson-3A6000 is treated as 8 cores, 8 threads. Remove smp_num_siblings to support HMP (Heterogeneous Multi-Processing). Signed-off-by: Liupu Wang <wangliupu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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1cf62488 |
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18-Apr-2023 |
Huacai Chen <chenhuacai@kernel.org> |
LoongArch: Fix build error if CONFIG_SUSPEND is not set We can see the following build error on LoongArch if CONFIG_SUSPEND is not set: ld: drivers/acpi/sleep.o: in function 'acpi_pm_prepare': sleep.c:(.text+0x2b8): undefined reference to 'loongarch_wakeup_start' Here is the call trace: acpi_pm_prepare() __acpi_pm_prepare() acpi_sleep_prepare() acpi_get_wakeup_address() loongarch_wakeup_start() Root cause: loongarch_wakeup_start() is defined in arch/loongarch/power/ suspend_asm.S which is only built under CONFIG_SUSPEND. In order to fix the build error, just let acpi_get_wakeup_address() return 0 if CONFIG_ SUSPEND is not set. Fixes: 366bb35a8e48 ("LoongArch: Add suspend (ACPI S3) support") Reviewed-by: WANG Xuerui <git@xen0n.name> Reported-by: Randy Dunlap <rdunlap@infradead.org> Link: https://lore.kernel.org/all/11215033-fa3c-ecb1-2fc0-e9aeba47be9b@infradead.org/ Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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366bb35a |
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10-Dec-2022 |
Huacai Chen <chenhuacai@kernel.org> |
LoongArch: Add suspend (ACPI S3) support Add suspend (Suspend To RAM, aka ACPI S3) support for LoongArch. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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f6fc0bf2 |
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02-Nov-2022 |
Huacai Chen <chenhuacai@kernel.org> |
Revert "LoongArch: Provisionally add ACPICA data structures" This reverts commit af6a1cfa6859dab4a843 ("LoongArch: Provisionally add ACPICA data structures") to fix build error for linux-next on LoongArch, since acpica is merged to linux-pm.git now. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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e0fba87c |
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02-Sep-2022 |
Huacai Chen <chenhuacai@kernel.org> |
LoongArch: Fix section mismatch due to acpi_os_ioremap() Now acpi_os_ioremap() is marked with __init because it calls memblock_ is_memory() which is also marked with __init in the !ARCH_KEEP_MEMBLOCK case. However, acpi_os_ioremap() is called by ordinary functions such as acpi_os_{read, write}_memory() and causes section mismatch warnings: WARNING: modpost: vmlinux.o: section mismatch in reference: acpi_os_read_memory (section: .text) -> acpi_os_ioremap (section: .init.text) WARNING: modpost: vmlinux.o: section mismatch in reference: acpi_os_write_memory (section: .text) -> acpi_os_ioremap (section: .init.text) Fix these warnings by selecting ARCH_KEEP_MEMBLOCK unconditionally and removing the __init modifier of acpi_os_ioremap(). This can also give a chance to track "memory" and "reserved" memblocks after early boot. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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af6a1cfa |
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20-Jul-2022 |
Marc Zyngier <maz@kernel.org> |
LoongArch: Provisionally add ACPICA data structures The LoongArch architecture is using ACPI, but the spec containing the required updates still is in an unreleased state. Instead of preventing the inclusion of the IRQ support into the kernel, add the missing bits to the arch-specific parts of the ACPICA support. Once the ACPICA bits are updated to the version that supports LoongArch, these bits can eventually be removed. Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn> Link: https://lore.kernel.org/r/1658314292-35346-2-git-send-email-lvjianmin@loongson.cn
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628c3bb4 |
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31-May-2022 |
Huacai Chen <chenhuacai@kernel.org> |
LoongArch: Add boot and setup routines Add basic boot, setup and reset routines for LoongArch. Now, LoongArch machines use UEFI-based firmware. The firmware passes configuration information to the kernel via ACPI and DMI/SMBIOS. Currently an existing interface between the kernel and the bootloader is implemented. Kernel gets 2 values from the bootloader, passed in registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and non-UEFI firmware, while a1 is a pointer to an FDT with systable, memmap, cmdline and initrd information. The standard UEFI boot protocol (EFISTUB) will be added later. Cc: linux-efi@vger.kernel.org Cc: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Co-developed-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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