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References: <1661747823-23745-1-git-send-email-tangyouling@loongson.cn> <1661747823-23745-2-git-send-email-tangyouling@loongson.cn> <19b78960-8c5e-fc5f-c102-12db7aedb548@loongson.cn> Cc: Baoquan He , Eric Biederman , WANG Xuerui , Vivek Goyal , Dave Young , Guo Ren , Jiaxun Yang , kexec@lists.infradead.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org From: Youling Tang Message-ID: <11193a49-c1eb-892b-48cb-1c928e179dbb@loongson.cn> Date: Wed, 31 Aug 2022 11:38:23 +0800 User-Agent: Mozilla/5.0 (X11; Linux mips64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <19b78960-8c5e-fc5f-c102-12db7aedb548@loongson.cn> X-CM-TRANSID: AQAAf8Bxnmuv1w5jT08NAA--.45230S3 X-Coremail-Antispam: 1UD129KBjvAXoW3uF48CF4UJrW3JF4xZr4rAFb_yoW8WFy5Jo W5JF4xJw48KryUJw15G3srXFWDX3s0gry5ZrWUAwsxWr12ya4jvr45Wry5tay3Kw18Ww4r Ga47Xwsa9ayxXrn5n29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UjIYCTnIWjp_UUUYG7AC8VAFwI0_Gr0_Xr1l1xkIjI8I6I8E6xAIw20EY4v20xva 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aXN0CmtleGVjQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9rZXhlYwo= From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 16618635 for ; Wed, 31 Aug 2022 03:38:34 +0000 (UTC) Received: from [10.130.0.193] (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxnmuv1w5jT08NAA--.45230S3; Wed, 31 Aug 2022 11:38:25 +0800 (CST) Subject: Re: [PATCH 1/3] LoongArch: Add kexec support To: Jinyang He , Huacai Chen References: <1661747823-23745-1-git-send-email-tangyouling@loongson.cn> <1661747823-23745-2-git-send-email-tangyouling@loongson.cn> <19b78960-8c5e-fc5f-c102-12db7aedb548@loongson.cn> Cc: Baoquan He , Eric Biederman , WANG Xuerui , Vivek Goyal , Dave Young , Guo Ren , Jiaxun Yang , kexec@lists.infradead.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org From: Youling Tang Message-ID: <11193a49-c1eb-892b-48cb-1c928e179dbb@loongson.cn> Date: Wed, 31 Aug 2022 11:38:23 +0800 User-Agent: Mozilla/5.0 (X11; Linux mips64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <19b78960-8c5e-fc5f-c102-12db7aedb548@loongson.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CM-TRANSID:AQAAf8Bxnmuv1w5jT08NAA--.45230S3 X-Coremail-Antispam: 1UD129KBjvAXoW3uF48CF4UJrW3JF4xZr4rAFb_yoW8WFy5Jo W5JF4xJw48KryUJw15G3srXFWDX3s0gry5ZrWUAwsxWr12ya4jvr45Wry5tay3Kw18Ww4r Ga47Xwsa9ayxXrn5n29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UjIYCTnIWjp_UUUYG7AC8VAFwI0_Gr0_Xr1l1xkIjI8I6I8E6xAIw20EY4v20xva j40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2 x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8 Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI 0_Cr1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xf McIj6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7 v_Jr0_Gr1lF7xvr2IY64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E 8cxan2IY04v7Mxk0xIA0c2IEe2xFo4CEbIxvr21lc2xSY4AK67AK6r48MxAIw28IcxkI7V AKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x 0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7VUj5l1PUUUUU== X-CM-SenderInfo: 5wdqw5prxox03j6o00pqjv00gofq/ On 08/30/2022 11:25 AM, Youling Tang wrote: > Hi, Jinyang > > On 08/30/2022 09:53 AM, Jinyang He wrote: >> Hi, Youling, >> >> >> On 08/29/2022 12:37 PM, Youling Tang wrote: >>> Add three new files, kexec.h, machine_kexec.c and relocate_kernel.S to >>> the >>> LoongArch architecture that add support for the kexec re-boot mechanis >>> (CONFIG_KEXEC) on LoongArch platforms. >>> >>> Supports loading vmlinux (vmlinux.elf) in ELF format and vmlinux.efi in >>> PE format. >>> >>> I tested this on LoongArch 3A5000 machine and works as expected, >>> >>> $ sudo kexec -l /boot/vmlinux.efi --reuse-cmdline >>> $ sudo kexec -e >>> >>> Signed-off-by: Youling Tang >>> --- >>> arch/loongarch/Kconfig | 11 ++ >>> arch/loongarch/include/asm/kexec.h | 58 ++++++++ >>> arch/loongarch/kernel/Makefile | 2 + >>> arch/loongarch/kernel/head.S | 7 +- >>> arch/loongarch/kernel/machine_kexec.c | 178 ++++++++++++++++++++++++ >>> arch/loongarch/kernel/relocate_kernel.S | 125 +++++++++++++++++ >>> 6 files changed, 380 insertions(+), 1 deletion(-) >>> create mode 100644 arch/loongarch/include/asm/kexec.h >>> create mode 100644 arch/loongarch/kernel/machine_kexec.c >>> create mode 100644 arch/loongarch/kernel/relocate_kernel.S >>> >>> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig >>> index 45364cffc793..903c82fa958d 100644 >>> --- a/arch/loongarch/Kconfig >>> +++ b/arch/loongarch/Kconfig >>> @@ -409,6 +409,17 @@ config FORCE_MAX_ZONEORDER >>> The page size is not necessarily 4KB. Keep this in mind >>> when choosing a value for this option. >>> +config KEXEC >>> + bool "Kexec system call" >>> + select KEXEC_CORE >>> + help >>> + kexec is a system call that implements the ability to shutdown >>> your >>> + current kernel, and to start another kernel. It is like a reboot >>> + but it is independent of the system firmware. And like a reboot >>> + you can start any kernel with it, not just Linux. >>> + >>> + The name comes from the similarity to the exec system call. >>> + >>> config SECCOMP >>> bool "Enable seccomp to safely compute untrusted bytecode" >>> depends on PROC_FS >>> diff --git a/arch/loongarch/include/asm/kexec.h >>> b/arch/loongarch/include/asm/kexec.h >>> new file mode 100644 >>> index 000000000000..5c9e7b5eccb8 >>> --- /dev/null >>> +++ b/arch/loongarch/include/asm/kexec.h >>> @@ -0,0 +1,58 @@ >>> +/* SPDX-License-Identifier: GPL-2.0 */ >>> +/* >>> + * kexec.h for kexec >>> + * >>> + * Copyright (C) 2022 Loongson Technology Corporation Limited >>> + */ >>> + >>> +#ifndef _ASM_KEXEC_H >>> +#define _ASM_KEXEC_H >>> + >>> +#include >>> +#include >>> + >>> +/* Maximum physical address we can use pages from */ >>> +#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) >>> +/* Maximum address we can reach in physical address mode */ >>> +#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) >>> + /* Maximum address we can use for the control code buffer */ >>> +#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL) >>> + >>> +/* Reserve a page for the control code buffer */ >>> +#define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE >>> + >>> +/* The native architecture */ >>> +#define KEXEC_ARCH KEXEC_ARCH_LOONGARCH >>> + >>> +static inline void crash_setup_regs(struct pt_regs *newregs, >>> + struct pt_regs *oldregs) >>> +{ >>> + if (oldregs) >>> + memcpy(newregs, oldregs, sizeof(*newregs)); >>> + else >>> + prepare_frametrace(newregs); >>> +} >>> + >>> +#define ARCH_HAS_KIMAGE_ARCH >>> + >>> +struct kimage_arch { >>> + unsigned long boot_flag; >>> + unsigned long fdt_addr; >>> +}; >>> + >>> +typedef void (*do_kexec_t)(unsigned long boot_flag, >>> + unsigned long fdt_addr, >>> + unsigned long first_ind_entry, >>> + unsigned long jump_addr); >>> + >>> +struct kimage; >>> +extern const unsigned char relocate_new_kernel[]; >>> +extern const size_t relocate_new_kernel_size; >>> + >>> +#ifdef CONFIG_SMP >>> +extern atomic_t kexec_ready_to_reboot; >>> +extern const unsigned char kexec_smp_wait[]; >>> +extern void kexec_reboot(void); >>> +#endif >>> + >>> +#endif /* !_ASM_KEXEC_H */ >>> diff --git a/arch/loongarch/kernel/Makefile >>> b/arch/loongarch/kernel/Makefile >>> index a213e994db68..20b64ac3f128 100644 >>> --- a/arch/loongarch/kernel/Makefile >>> +++ b/arch/loongarch/kernel/Makefile >>> @@ -17,6 +17,8 @@ obj-$(CONFIG_CPU_HAS_FPU) += fpu.o >>> obj-$(CONFIG_MODULES) += module.o module-sections.o >>> obj-$(CONFIG_STACKTRACE) += stacktrace.o >>> +obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o >>> + >>> obj-$(CONFIG_PROC_FS) += proc.o >>> obj-$(CONFIG_SMP) += smp.o >>> diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S >>> index 01bac62a6442..22bdf4928325 100644 >>> --- a/arch/loongarch/kernel/head.S >>> +++ b/arch/loongarch/kernel/head.S >>> @@ -20,7 +20,12 @@ >>> _head: >>> .word MZ_MAGIC /* "MZ", MS-DOS header */ >>> - .org 0x3c /* 0x04 ~ 0x3b reserved */ >>> + .org 0x8 >>> + .quad 0 /* Image load offset from start of RAM */ >>> + .dword _end - _text /* Effective size of kernel image */ >>> + .quad 0 >>> + .dword kernel_entry /* Kernel entry point */ >>> + .org 0x3c /* 0x28 ~ 0x3b reserved */ >>> .long pe_header - _head /* Offset to the PE header */ >>> pe_header: >>> diff --git a/arch/loongarch/kernel/machine_kexec.c >>> b/arch/loongarch/kernel/machine_kexec.c >>> new file mode 100644 >>> index 000000000000..4ffcd4cd9c8c >>> --- /dev/null >>> +++ b/arch/loongarch/kernel/machine_kexec.c >>> @@ -0,0 +1,178 @@ >>> +// SPDX-License-Identifier: GPL-2.0-only >>> +/* >>> + * machine_kexec.c for kexec >>> + * >>> + * Copyright (C) 2022 Loongson Technology Corporation Limited >>> + */ >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#include >>> +#include >>> +#include >>> + >>> +/* 0x100000 ~ 0x200000 is safe */ >>> +#define KEXEC_CTRL_CODE TO_CACHE(0x100000UL) >>> +#define KEXEC_BLOB_ADDR TO_CACHE(0x108000UL) >>> + >>> +static unsigned long reboot_code_buffer; >>> +#ifdef CONFIG_SMP >>> +void (*relocated_kexec_smp_wait)(void *); >>> +atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0); >>> +#endif >>> + >>> +static unsigned long jump_addr; >>> +static unsigned long first_ind_entry; >>> +static unsigned long boot_flag; >>> +static unsigned long fdt_addr; >>> + >>> +static void kexec_image_info(const struct kimage *kimage) >>> +{ >>> + unsigned long i; >>> + >>> + pr_debug("kexec kimage info:\n"); >>> + pr_debug("\ttype: %d\n", kimage->type); >>> + pr_debug("\tstart: %lx\n", kimage->start); >>> + pr_debug("\thead: %lx\n", kimage->head); >>> + pr_debug("\tnr_segments: %lu\n", kimage->nr_segments); >>> + >>> + for (i = 0; i < kimage->nr_segments; i++) { >>> + pr_debug("\t segment[%lu]: %016lx - %016lx", i, >>> + kimage->segment[i].mem, >>> + kimage->segment[i].mem + kimage->segment[i].memsz); >>> + pr_debug("\t\t0x%lx bytes, %lu pages\n", >>> + (unsigned long)kimage->segment[i].memsz, >>> + (unsigned long)kimage->segment[i].memsz / PAGE_SIZE); >>> + } >>> +} >>> + >>> +int machine_kexec_prepare(struct kimage *kimage) >>> +{ >>> + int i; >>> + void *dtb = (void *)KEXEC_BLOB_ADDR; >>> + >>> + kexec_image_info(kimage); >>> + >>> + /* Find the Flattened Device Tree */ >>> + for (i = 0; i < kimage->nr_segments; i++) { >>> + if (!fdt_check_header(kimage->segment[i].buf)) { >>> + memcpy(dtb, kimage->segment[i].buf, SZ_64K); >>> + kimage->arch.boot_flag = fw_arg0; >>> + kimage->arch.fdt_addr = (unsigned long) dtb; >>> + break; >>> + } >>> + continue; >>> + } >>> + >>> + /* kexec need a safe page to save reboot_code_buffer */ >>> + kimage->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE); >>> + >>> + reboot_code_buffer = >>> + (unsigned long)page_address(kimage->control_code_page); >>> + memcpy((void *)reboot_code_buffer, relocate_new_kernel, >>> + relocate_new_kernel_size); >> It copys same content to KEXEC_CTRL_CODE each time, could we do this at >> boot time? > I think it's possible to have the copy action happen at boot-time or > during the prepare phase. (RISCV in prepare, MIPS in boot-time) > >> >> BTW, our system always keep the low-2MB no used, on mips-loongson or >> LoongArch. Is that necessary on LoongArch? We cannot use parameter >> 'mem=YYM' normally but 'mem=YYM@2M' is ok. And the low-2MB is not >> in virtual memory management, although we can get it in kernel. > For existing kernels, the low 2M has been reserved by > memblock_reserve(PHYS_OFFSET, 0x200000), maybe it is acceptable to keep > the low 2M behavior. > > Yes, we need to use "mem=YM@2M" if the low 2M is reserved. > >> >> In kexec/kdump process, we can follows kimage_alloc_control_pages(). >> When the boot cpu copy complete the second-kernels, all cpus can jump >> to a kernel-entry-trampoline which is in kernel image. Then we don't >> worry about the code can be destroyed. The kernel-entry-trampoline >> get its cpuid, keep non-boot cpus do as kexec_smp_wait and let boot >> cpu go kernel-entry. In this way we can drop the low-2MB IMO. > > It is also feasible to dynamically allocate control pages, but it is > easier to use a low 2M approach. What do you think, Huacai? > >> >>> + >>> + /* All secondary cpus now may jump to kexec_smp_wait cycle */ >>> + relocated_kexec_smp_wait = reboot_code_buffer + >>> + (void *)(kexec_smp_wait - relocate_new_kernel); >>> + >>> + return 0; >>> +} >>> + >>> +void machine_kexec_cleanup(struct kimage *kimage) >>> +{ >>> +} >>> + >>> +#ifdef CONFIG_SMP >>> +void kexec_reboot(void) >>> +{ >>> + do_kexec_t do_kexec = NULL; >>> + >>> + /* All secondary cpus go to kexec_smp_wait */ >>> + if (smp_processor_id() > 0) { >>> + relocated_kexec_smp_wait(NULL); >>> + unreachable(); >>> + } >>> + >>> + do_kexec = (void *)reboot_code_buffer; >>> + do_kexec(boot_flag, fdt_addr, first_ind_entry, jump_addr); >>> + >>> + unreachable(); >>> +} >>> + >>> +static void kexec_shutdown_secondary(void *) >>> +{ >>> + local_irq_disable(); >>> + while (!atomic_read(&kexec_ready_to_reboot)) >>> + cpu_relax(); >>> + >>> + kexec_reboot(); >>> +} >>> + >>> +void machine_crash_shutdown(struct pt_regs *regs) >>> +{ >>> +} >>> +#endif >>> + >>> +void machine_shutdown(void) >>> +{ >>> + smp_call_function(kexec_shutdown_secondary, NULL, 0); >>> +} >>> + >>> +void machine_kexec(struct kimage *image) >>> +{ >>> + unsigned long entry; >>> + unsigned long *ptr; >>> + struct kimage_arch *internal = &image->arch; >>> + >>> + boot_flag = internal->boot_flag; >>> + fdt_addr = internal->fdt_addr; >>> + >>> + jump_addr = (unsigned long)phys_to_virt(image->start); >>> + >>> + first_ind_entry = (unsigned long)phys_to_virt(image->head & >>> PAGE_MASK); >>> + >>> + /* >>> + * The generic kexec code builds a page list with physical >>> + * addresses. they are directly accessible through XKPRANGE >>> + * hence the phys_to_virt() call. >>> + */ >>> + for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); >>> + ptr = (entry & IND_INDIRECTION) ? >>> + phys_to_virt(entry & PAGE_MASK) : ptr + 1) { >>> + if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || >>> + *ptr & IND_DESTINATION) >>> + *ptr = (unsigned long) phys_to_virt(*ptr); >>> + } >>> + >>> + /* Mark offline before disabling local irq. */ >>> + set_cpu_online(smp_processor_id(), false); >>> + >>> + /* we do not want to be bothered. */ >>> + local_irq_disable(); >>> + >>> + pr_notice("Will call new kernel at %lx\n", jump_addr); >>> + pr_notice("FDT image at %lx\n", fdt_addr); >>> + pr_notice("Bye ...\n"); >>> + >>> + /* Make reboot code buffer available to the boot CPU. */ >>> + flush_cache_all(); >>> + >>> + atomic_set(&kexec_ready_to_reboot, 1); >>> + >>> + /* >>> + * We know we were online, and there will be no incoming IPIs at >>> + * this point. >>> + */ >>> + set_cpu_online(smp_processor_id(), true); >>> + >>> + /* Ensure remote CPUs observe that we're online before >>> rebooting. */ >>> + smp_mb__after_atomic(); >>> + >>> + kexec_reboot(); >>> +} >>> diff --git a/arch/loongarch/kernel/relocate_kernel.S >>> b/arch/loongarch/kernel/relocate_kernel.S >>> new file mode 100644 >>> index 000000000000..d1f242f74ea8 >>> --- /dev/null >>> +++ b/arch/loongarch/kernel/relocate_kernel.S >>> @@ -0,0 +1,125 @@ >>> +/* SPDX-License-Identifier: GPL-2.0 */ >>> +/* >>> + * relocate_kernel.S for kexec >>> + * >>> + * Copyright (C) 2022 Loongson Technology Corporation Limited >>> + */ >>> + >>> +#include >>> + >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#define IPI_REG_BASE 0x1fe01000 >>> + >>> +SYM_CODE_START(relocate_new_kernel) >>> + /* >>> + * s0: Boot flag passed to the new kernel >>> + * s1: Virt address of the FDT image >>> + * s2: Pointer to the current entry >>> + * s3: Virt address to jump to after relocation >>> + */ >>> + move s0, a0 >>> + move s1, a1 >>> + move s2, a2 >>> + move s3, a3 >>> + >>> +process_entry: >>> + PTR_L s4, s2, 0 >>> + PTR_ADDI s2, s2, SZREG >>> + >>> + /* destination page */ >>> + andi s5, s4, IND_DESTINATION >>> + beqz s5, 1f >>> + li.w t0, ~0x1 >>> + and s6, s4, t0 /* store destination addr in s6 */ >>> + b process_entry >>> + >>> +1: >>> + /* indirection page, update s2 */ >>> + andi s5, s4, IND_INDIRECTION >>> + beqz s5, 1f >>> + li.w t0, ~0x2 >>> + and s2, s4, t0 >>> + b process_entry >>> + >>> +1: >>> + /* done page */ >>> + andi s5, s4, IND_DONE >>> + beqz s5, 1f >>> + b done >>> +1: >>> + /* source page */ >>> + andi s5, s4, IND_SOURCE >>> + beqz s5, process_entry >>> + li.w t0, ~0x8 >>> + and s4, s4, t0 >>> + li.w s8, (1 << _PAGE_SHIFT) / SZREG >>> + >>> +copy_word: >>> + /* copy page word by word */ >>> + REG_L s7, s4, 0 >>> + REG_S s7, s6, 0 >>> + PTR_ADDI s6, s6, SZREG >>> + PTR_ADDI s4, s4, SZREG >>> + LONG_ADDI s8, s8, -1 >>> + beqz s8, process_entry >>> + b copy_word >>> + b process_entry >>> + >>> +done: >>> + dbar 0 >> ibar, too? > > Will add ibar 0. > >>> + >>> + move a0, s0 >>> + move a1, s1 >>> + /* jump to the new kernel */ >>> + jr s3 >>> +SYM_CODE_END(relocate_new_kernel) >>> + >>> +#ifdef CONFIG_SMP >>> +/* >>> + * Other CPUs should wait until code is relocated and >>> + * then start at entry (?) point. >>> + */ >>> +SYM_CODE_START(kexec_smp_wait) >>> + li.d t0, IPI_REG_BASE >>> + li.d t1, UNCACHE_BASE >>> + or t0, t0, t1 >>> + >>> + /* >>> + * s1:initfn >>> + * t0:base t1:cpuid t2:node t3:core t4:count >>> + */ >>> + csrrd t1, LOONGARCH_CSR_CPUID >>> + andi t1, t1, CSR_CPUID_COREID >>> + andi t3, t1, 0x3 >>> + slli.w t3, t3, 8 /* get core id */ >>> + or t0, t0, t3 >>> + andi t2, t1, 0x3c >>> + slli.d t2, t2, 42 /* get node id */ >>> + or t0, t0, t2 >>> + >>> +1: li.w t4, 0x100 /* wait for init loop */ >>> +2: addi.w t4, t4, -1 /* limit mailbox access */ >>> + bnez t4, 2b >>> + ld.w s1, t0, 0x20 /* check PC as an indicator */ >> Can we do this with iocsr*? > > OK, I will consider the implementation in the iocsr way. > The kexec_smp_wait implementation will be modified in the next release as follows： SYM_CODE_START(kexec_smp_wait) 1: li.w t0, 0x100 /* wait for init loop */ 2: addi.w t0, t0, -1 /* limit mailbox access */ bnez t0, 2b li.w t1, LOONGARCH_IOCSR_MBUF0 iocsrrd.w s1, t1 /* check PC as an indicator */ beqz s1, 1b iocsrrd.d s1, t1 /* get PC via mailbox */ li.d t0, CACHE_BASE or s1, s1, t0 jr s1 /* jump to initial PC */ SYM_CODE_END(kexec_smp_wait) 1) Using the iocsr method 2) Remove sp, tp settings. sp, tp will be obtained from cpuboot_data in smpboot_entry. Thanks again Jinyang for the suggestion. Youling. > Thanks, > Youling >> >> Thanks, >> Jinyang >>> + beqz s1, 1b >>> + ld.d s1, t0, 0x20 /* get PC via mailbox */ >>> + ld.d sp, t0, 0x28 /* get SP via mailbox */ >>> + ld.d tp, t0, 0x30 /* get TP via mailbox */ >>> + >>> + li.d t0, CACHE_BASE >>> + or s1, s1, t0 >>> + jr s1 /* jump to initial PC */ >>> +SYM_CODE_END(kexec_smp_wait) >>> +#endif >>> + >>> +relocate_new_kernel_end: >>> + >>> +SYM_DATA_START(relocate_new_kernel_size) >>> + PTR relocate_new_kernel_end - relocate_new_kernel >>> +SYM_DATA_END(relocate_new_kernel_size) >> >