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Message-ID: <CAEEQ3wn2U0iwQrGGxt0rZ5r0a+iMKyxFQ2SOf9amY88jt-avcg@mail.gmail.com>
Date: Fri, 16 Feb 2024 16:32:03 +0800
From: yunhui cui <cuiyunhui@...edance.com>
To: Song Shuai <songshuaishuai@...ylab.org>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
lihuafei1@...wei.com, conor.dooley@...rochip.com, liaochang1@...wei.com,
guoren@...nel.org, ajones@...tanamicro.com, alexghiti@...osinc.com,
evan@...osinc.com, sunilvl@...tanamicro.com, xianting.tian@...ux.alibaba.com,
samitolvanen@...gle.com, masahiroy@...nel.org, apatel@...tanamicro.com,
jszhang@...nel.org, duwe@...e.de, eric.devolder@...cle.com,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [External] [PATCH 1/2] riscv: kexec_file: Split the loading of
kernel and others
Hi Shuai,
Why rename elf_kexec.c to kexec_elf.c ？
On Thu, Sep 14, 2023 at 10:08 AM Song Shuai <songshuaishuai@...ylaborg> wrote:
>
> This is the preparative patch for kexec_file_load Image support.
>
> It separates the elf_kexec_load() as two parts:
> - the first part loads the vmlinux (or Image)
> - the second part loads other segments (e.g. initrd,fdt,purgatory)
>
> And the second part is exported as the load_extra_segments() function
> which would be used in both kexec-elf.c and kexec-image.c.
>
> Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
> ---
> arch/riscv/include/asm/kexec.h | 5 +
> arch/riscv/kernel/Makefile | 2 +-
> arch/riscv/kernel/elf_kexec.c | 469 -------------------------
> arch/riscv/kernel/kexec_elf.c | 147 ++++++++
> arch/riscv/kernel/machine_kexec_file.c | 7 +
> 5 files changed, 160 insertions(+), 470 deletions(-)
> delete mode 100644 arch/riscv/kernel/elf_kexec.c
> create mode 100644 arch/riscv/kernel/kexec_elf.c
>
> diff --git a/arch/riscv/include/asm/kexec.h b/arch/riscv/include/asm/kexec.h
> index 2b56769cb530..518825fe4160 100644
> --- a/arch/riscv/include/asm/kexec.h
> +++ b/arch/riscv/include/asm/kexec.h
> @@ -67,6 +67,11 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
> struct kimage;
> int arch_kimage_file_post_load_cleanup(struct kimage *image);
> #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
> +
> +int load_extra_segments(struct kimage *image, unsigned long kernel_start,
> + unsigned long kernel_len, char *initrd,
> + unsigned long initrd_len, char *cmdline,
> + unsigned long cmdline_len);
> #endif
>
> #endif
> diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
> index 95cf25d48405..1c62c639e875 100644
> --- a/arch/riscv/kernel/Makefile
> +++ b/arch/riscv/kernel/Makefile
> @@ -86,7 +86,7 @@ endif
> obj-$(CONFIG_HOTPLUG_CPU) += cpu-hotplug.o
> obj-$(CONFIG_KGDB) += kgdb.o
> obj-$(CONFIG_KEXEC_CORE) += kexec_relocate.o crash_save_regs.o machine_kexec.o
> -obj-$(CONFIG_KEXEC_FILE) += elf_kexec.o machine_kexec_file.o
> +obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o machine_kexec_file.o
> obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
> obj-$(CONFIG_CRASH_CORE) += crash_core.o
>
> diff --git a/arch/riscv/kernel/elf_kexec.c b/arch/riscv/kernel/elf_kexec.c
> deleted file mode 100644
> index e60fbd8660c4..000000000000
> --- a/arch/riscv/kernel/elf_kexec.c
> +++ /dev/null
> @@ -1,469 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * Load ELF vmlinux file for the kexec_file_load syscall.
> - *
> - * Copyright (C) 2021 Huawei Technologies Co, Ltd.
> - *
> - * Author: Liao Chang (liaochang1@...wei.com)
> - *
> - * Based on kexec-tools' kexec-elf-riscv.c, heavily modified
> - * for kernel.
> - */
> -
> -#define pr_fmt(fmt) "kexec_image: " fmt
> -
> -#include <linux/elf.h>
> -#include <linux/kexec.h>
> -#include <linux/slab.h>
> -#include <linux/of.h>
> -#include <linux/libfdt.h>
> -#include <linux/types.h>
> -#include <linux/memblock.h>
> -#include <asm/setup.h>
> -
> -int arch_kimage_file_post_load_cleanup(struct kimage *image)
> -{
> - kvfree(image->arch.fdt);
> - image->arch.fdt = NULL;
> -
> - vfree(image->elf_headers);
> - image->elf_headers = NULL;
> - image->elf_headers_sz = 0;
> -
> - return kexec_image_post_load_cleanup_default(image);
> -}
> -
> -static int riscv_kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
> - struct kexec_elf_info *elf_info, unsigned long old_pbase,
> - unsigned long new_pbase)
> -{
> - int i;
> - int ret = 0;
> - size_t size;
> - struct kexec_buf kbuf;
> - const struct elf_phdr *phdr;
> -
> - kbuf.image = image;
> -
> - for (i = 0; i < ehdr->e_phnum; i++) {
> - phdr = &elf_info->proghdrs[i];
> - if (phdr->p_type != PT_LOAD)
> - continue;
> -
> - size = phdr->p_filesz;
> - if (size > phdr->p_memsz)
> - size = phdr->p_memsz;
> -
> - kbuf.buffer = (void *) elf_info->buffer + phdr->p_offset;
> - kbuf.bufsz = size;
> - kbuf.buf_align = phdr->p_align;
> - kbuf.mem = phdr->p_paddr - old_pbase + new_pbase;
> - kbuf.memsz = phdr->p_memsz;
> - kbuf.top_down = false;
> - ret = kexec_add_buffer(&kbuf);
> - if (ret)
> - break;
> - }
> -
> - return ret;
> -}
> -
> -/*
> - * Go through the available phsyical memory regions and find one that hold
> - * an image of the specified size.
> - */
> -static int elf_find_pbase(struct kimage *image, unsigned long kernel_len,
> - struct elfhdr *ehdr, struct kexec_elf_info *elf_info,
> - unsigned long *old_pbase, unsigned long *new_pbase)
> -{
> - int i;
> - int ret;
> - struct kexec_buf kbuf;
> - const struct elf_phdr *phdr;
> - unsigned long lowest_paddr = ULONG_MAX;
> - unsigned long lowest_vaddr = ULONG_MAX;
> -
> - for (i = 0; i < ehdr->e_phnum; i++) {
> - phdr = &elf_info->proghdrs[i];
> - if (phdr->p_type != PT_LOAD)
> - continue;
> -
> - if (lowest_paddr > phdr->p_paddr)
> - lowest_paddr = phdr->p_paddr;
> -
> - if (lowest_vaddr > phdr->p_vaddr)
> - lowest_vaddr = phdr->p_vaddr;
> - }
> -
> - kbuf.image = image;
> - kbuf.buf_min = lowest_paddr;
> - kbuf.buf_max = ULONG_MAX;
> -
> - /*
> - * Current riscv boot protocol requires 2MB alignment for
> - * RV64 and 4MB alignment for RV32
> - *
> - */
> - kbuf.buf_align = PMD_SIZE;
> - kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> - kbuf.memsz = ALIGN(kernel_len, PAGE_SIZE);
> - kbuf.top_down = false;
> - ret = arch_kexec_locate_mem_hole(&kbuf);
> - if (!ret) {
> - *old_pbase = lowest_paddr;
> - *new_pbase = kbuf.mem;
> - image->start = ehdr->e_entry - lowest_vaddr + kbuf.mem;
> - }
> - return ret;
> -}
> -
> -static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
> -{
> - unsigned int *nr_ranges = arg;
> -
> - (*nr_ranges)++;
> - return 0;
> -}
> -
> -static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg)
> -{
> - struct crash_mem *cmem = arg;
> -
> - cmem->ranges[cmem->nr_ranges].start = res->start;
> - cmem->ranges[cmem->nr_ranges].end = res->end;
> - cmem->nr_ranges++;
> -
> - return 0;
> -}
> -
> -static int prepare_elf_headers(void **addr, unsigned long *sz)
> -{
> - struct crash_mem *cmem;
> - unsigned int nr_ranges;
> - int ret;
> -
> - nr_ranges = 1; /* For exclusion of crashkernel region */
> - walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
> -
> - cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL);
> - if (!cmem)
> - return -ENOMEM;
> -
> - cmem->max_nr_ranges = nr_ranges;
> - cmem->nr_ranges = 0;
> - ret = walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback);
> - if (ret)
> - goto out;
> -
> - /* Exclude crashkernel region */
> - ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
> - if (!ret)
> - ret = crash_prepare_elf64_headers(cmem, true, addr, sz);
> -
> -out:
> - kfree(cmem);
> - return ret;
> -}
> -
> -static char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> - unsigned long cmdline_len)
> -{
> - int elfcorehdr_strlen;
> - char *cmdline_ptr;
> -
> - cmdline_ptr = kzalloc(COMMAND_LINE_SIZE, GFP_KERNEL);
> - if (!cmdline_ptr)
> - return NULL;
> -
> - elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
> - image->elf_load_addr);
> -
> - if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
> - pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
> - kfree(cmdline_ptr);
> - return NULL;
> - }
> -
> - memcpy(cmdline_ptr + elfcorehdr_strlen, cmdline, cmdline_len);
> - /* Ensure it's nul terminated */
> - cmdline_ptr[COMMAND_LINE_SIZE - 1] = '\0';
> - return cmdline_ptr;
> -}
> -
> -static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
> - unsigned long kernel_len, char *initrd,
> - unsigned long initrd_len, char *cmdline,
> - unsigned long cmdline_len)
> -{
> - int ret;
> - unsigned long old_kernel_pbase = ULONG_MAX;
> - unsigned long new_kernel_pbase = 0UL;
> - unsigned long initrd_pbase = 0UL;
> - unsigned long headers_sz;
> - unsigned long kernel_start;
> - void *fdt, *headers;
> - struct elfhdr ehdr;
> - struct kexec_buf kbuf;
> - struct kexec_elf_info elf_info;
> - char *modified_cmdline = NULL;
> -
> - ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
> - if (ret)
> - return ERR_PTR(ret);
> -
> - ret = elf_find_pbase(image, kernel_len, &ehdr, &elf_info,
> - &old_kernel_pbase, &new_kernel_pbase);
> - if (ret)
> - goto out;
> - kernel_start = image->start;
> - pr_notice("The entry point of kernel at 0x%lx\n", image->start);
> -
> - /* Add the kernel binary to the image */
> - ret = riscv_kexec_elf_load(image, &ehdr, &elf_info,
> - old_kernel_pbase, new_kernel_pbase);
> - if (ret)
> - goto out;
> -
> - kbuf.image = image;
> - kbuf.buf_min = new_kernel_pbase + kernel_len;
> - kbuf.buf_max = ULONG_MAX;
> -
> - /* Add elfcorehdr */
> - if (image->type == KEXEC_TYPE_CRASH) {
> - ret = prepare_elf_headers(&headers, &headers_sz);
> - if (ret) {
> - pr_err("Preparing elf core header failed\n");
> - goto out;
> - }
> -
> - kbuf.buffer = headers;
> - kbuf.bufsz = headers_sz;
> - kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> - kbuf.memsz = headers_sz;
> - kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
> - kbuf.top_down = true;
> -
> - ret = kexec_add_buffer(&kbuf);
> - if (ret) {
> - vfree(headers);
> - goto out;
> - }
> - image->elf_headers = headers;
> - image->elf_load_addr = kbuf.mem;
> - image->elf_headers_sz = headers_sz;
> -
> - pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
> - image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
> -
> - /* Setup cmdline for kdump kernel case */
> - modified_cmdline = setup_kdump_cmdline(image, cmdline,
> - cmdline_len);
> - if (!modified_cmdline) {
> - pr_err("Setting up cmdline for kdump kernel failed\n");
> - ret = -EINVAL;
> - goto out;
> - }
> - cmdline = modified_cmdline;
> - }
> -
> -#ifdef CONFIG_ARCH_SUPPORTS_KEXEC_PURGATORY
> - /* Add purgatory to the image */
> - kbuf.top_down = true;
> - kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> - ret = kexec_load_purgatory(image, &kbuf);
> - if (ret) {
> - pr_err("Error loading purgatory ret=%d\n", ret);
> - goto out;
> - }
> - ret = kexec_purgatory_get_set_symbol(image, "riscv_kernel_entry",
> - &kernel_start,
> - sizeof(kernel_start), 0);
> - if (ret)
> - pr_err("Error update purgatory ret=%d\n", ret);
> -#endif /* CONFIG_ARCH_SUPPORTS_KEXEC_PURGATORY */
> -
> - /* Add the initrd to the image */
> - if (initrd != NULL) {
> - kbuf.buffer = initrd;
> - kbuf.bufsz = kbuf.memsz = initrd_len;
> - kbuf.buf_align = PAGE_SIZE;
> - kbuf.top_down = true;
> - kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> - ret = kexec_add_buffer(&kbuf);
> - if (ret)
> - goto out;
> - initrd_pbase = kbuf.mem;
> - pr_notice("Loaded initrd at 0x%lx\n", initrd_pbase);
> - }
> -
> - /* Add the DTB to the image */
> - fdt = of_kexec_alloc_and_setup_fdt(image, initrd_pbase,
> - initrd_len, cmdline, 0);
> - if (!fdt) {
> - pr_err("Error setting up the new device tree.\n");
> - ret = -EINVAL;
> - goto out;
> - }
> -
> - fdt_pack(fdt);
> - kbuf.buffer = fdt;
> - kbuf.bufsz = kbuf.memsz = fdt_totalsize(fdt);
> - kbuf.buf_align = PAGE_SIZE;
> - kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> - kbuf.top_down = true;
> - ret = kexec_add_buffer(&kbuf);
> - if (ret) {
> - pr_err("Error add DTB kbuf ret=%d\n", ret);
> - goto out_free_fdt;
> - }
> - /* Cache the fdt buffer address for memory cleanup */
> - image->arch.fdt = fdt;
> - pr_notice("Loaded device tree at 0x%lx\n", kbuf.mem);
> - goto out;
> -
> -out_free_fdt:
> - kvfree(fdt);
> -out:
> - kfree(modified_cmdline);
> - kexec_free_elf_info(&elf_info);
> - return ret ? ERR_PTR(ret) : NULL;
> -}
> -
> -#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
> -#define RISCV_IMM_BITS 12
> -#define RISCV_IMM_REACH (1LL << RISCV_IMM_BITS)
> -#define RISCV_CONST_HIGH_PART(x) \
> - (((x) + (RISCV_IMM_REACH >> 1)) & ~(RISCV_IMM_REACH - 1))
> -#define RISCV_CONST_LOW_PART(x) ((x) - RISCV_CONST_HIGH_PART(x))
> -
> -#define ENCODE_ITYPE_IMM(x) \
> - (RV_X(x, 0, 12) << 20)
> -#define ENCODE_BTYPE_IMM(x) \
> - ((RV_X(x, 1, 4) << 8) | (RV_X(x, 5, 6) << 25) | \
> - (RV_X(x, 11, 1) << 7) | (RV_X(x, 12, 1) << 31))
> -#define ENCODE_UTYPE_IMM(x) \
> - (RV_X(x, 12, 20) << 12)
> -#define ENCODE_JTYPE_IMM(x) \
> - ((RV_X(x, 1, 10) << 21) | (RV_X(x, 11, 1) << 20) | \
> - (RV_X(x, 12, 8) << 12) | (RV_X(x, 20, 1) << 31))
> -#define ENCODE_CBTYPE_IMM(x) \
> - ((RV_X(x, 1, 2) << 3) | (RV_X(x, 3, 2) << 10) | (RV_X(x, 5, 1) << 2) | \
> - (RV_X(x, 6, 2) << 5) | (RV_X(x, 8, 1) << 12))
> -#define ENCODE_CJTYPE_IMM(x) \
> - ((RV_X(x, 1, 3) << 3) | (RV_X(x, 4, 1) << 11) | (RV_X(x, 5, 1) << 2) | \
> - (RV_X(x, 6, 1) << 7) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 8, 2) << 9) | \
> - (RV_X(x, 10, 1) << 8) | (RV_X(x, 11, 1) << 12))
> -#define ENCODE_UJTYPE_IMM(x) \
> - (ENCODE_UTYPE_IMM(RISCV_CONST_HIGH_PART(x)) | \
> - (ENCODE_ITYPE_IMM(RISCV_CONST_LOW_PART(x)) << 32))
> -#define ENCODE_UITYPE_IMM(x) \
> - (ENCODE_UTYPE_IMM(x) | (ENCODE_ITYPE_IMM(x) << 32))
> -
> -#define CLEAN_IMM(type, x) \
> - ((~ENCODE_##type##_IMM((uint64_t)(-1))) & (x))
> -
> -int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
> - Elf_Shdr *section,
> - const Elf_Shdr *relsec,
> - const Elf_Shdr *symtab)
> -{
> - const char *strtab, *name, *shstrtab;
> - const Elf_Shdr *sechdrs;
> - Elf64_Rela *relas;
> - int i, r_type;
> -
> - /* String & section header string table */
> - sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
> - strtab = (char *)pi->ehdr + sechdrs[symtab->sh_link].sh_offset;
> - shstrtab = (char *)pi->ehdr + sechdrs[pi->ehdr->e_shstrndx].sh_offset;
> -
> - relas = (void *)pi->ehdr + relsec->sh_offset;
> -
> - for (i = 0; i < relsec->sh_size / sizeof(*relas); i++) {
> - const Elf_Sym *sym; /* symbol to relocate */
> - unsigned long addr; /* final location after relocation */
> - unsigned long val; /* relocated symbol value */
> - unsigned long sec_base; /* relocated symbol value */
> - void *loc; /* tmp location to modify */
> -
> - sym = (void *)pi->ehdr + symtab->sh_offset;
> - sym += ELF64_R_SYM(relas[i].r_info);
> -
> - if (sym->st_name)
> - name = strtab + sym->st_name;
> - else
> - name = shstrtab + sechdrs[sym->st_shndx].sh_name;
> -
> - loc = pi->purgatory_buf;
> - loc += section->sh_offset;
> - loc += relas[i].r_offset;
> -
> - if (sym->st_shndx == SHN_ABS)
> - sec_base = 0;
> - else if (sym->st_shndx >= pi->ehdr->e_shnum) {
> - pr_err("Invalid section %d for symbol %s\n",
> - sym->st_shndx, name);
> - return -ENOEXEC;
> - } else
> - sec_base = pi->sechdrs[sym->st_shndx].sh_addr;
> -
> - val = sym->st_value;
> - val += sec_base;
> - val += relas[i].r_addend;
> -
> - addr = section->sh_addr + relas[i].r_offset;
> -
> - r_type = ELF64_R_TYPE(relas[i].r_info);
> -
> - switch (r_type) {
> - case R_RISCV_BRANCH:
> - *(u32 *)loc = CLEAN_IMM(BTYPE, *(u32 *)loc) |
> - ENCODE_BTYPE_IMM(val - addr);
> - break;
> - case R_RISCV_JAL:
> - *(u32 *)loc = CLEAN_IMM(JTYPE, *(u32 *)loc) |
> - ENCODE_JTYPE_IMM(val - addr);
> - break;
> - /*
> - * With no R_RISCV_PCREL_LO12_S, R_RISCV_PCREL_LO12_I
> - * sym is expected to be next to R_RISCV_PCREL_HI20
> - * in purgatory relsec. Handle it like R_RISCV_CALL
> - * sym, instead of searching the whole relsec.
> - */
> - case R_RISCV_PCREL_HI20:
> - case R_RISCV_CALL_PLT:
> - case R_RISCV_CALL:
> - *(u64 *)loc = CLEAN_IMM(UITYPE, *(u64 *)loc) |
> - ENCODE_UJTYPE_IMM(val - addr);
> - break;
> - case R_RISCV_RVC_BRANCH:
> - *(u32 *)loc = CLEAN_IMM(CBTYPE, *(u32 *)loc) |
> - ENCODE_CBTYPE_IMM(val - addr);
> - break;
> - case R_RISCV_RVC_JUMP:
> - *(u32 *)loc = CLEAN_IMM(CJTYPE, *(u32 *)loc) |
> - ENCODE_CJTYPE_IMM(val - addr);
> - break;
> - case R_RISCV_ADD32:
> - *(u32 *)loc += val;
> - break;
> - case R_RISCV_SUB32:
> - *(u32 *)loc -= val;
> - break;
> - /* It has been applied by R_RISCV_PCREL_HI20 sym */
> - case R_RISCV_PCREL_LO12_I:
> - case R_RISCV_ALIGN:
> - case R_RISCV_RELAX:
> - break;
> - default:
> - pr_err("Unknown rela relocation: %d\n", r_type);
> - return -ENOEXEC;
> - }
> - }
> - return 0;
> -}
> -
> -const struct kexec_file_ops elf_kexec_ops = {
> - .probe = kexec_elf_probe,
> - .load = elf_kexec_load,
> -};
> diff --git a/arch/riscv/kernel/kexec_elf.c b/arch/riscv/kernel/kexec_elf.c
> new file mode 100644
> index 000000000000..f41272da6b2f
> --- /dev/null
> +++ b/arch/riscv/kernel/kexec_elf.c
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Load ELF vmlinux file for the kexec_file_load syscall.
> + *
> + * Copyright (C) 2021 Huawei Technologies Co, Ltd.
> + *
> + * Author: Liao Chang (liaochang1@...wei.com)
> + *
> + * Based on kexec-tools' kexec-elf-riscv.c, heavily modified
> + * for kernel.
> + */
> +
> +#define pr_fmt(fmt) "kexec_image: " fmt
> +
> +#include <linux/elf.h>
> +#include <linux/kexec.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/libfdt.h>
> +#include <linux/types.h>
> +#include <linux/memblock.h>
> +#include <asm/setup.h>
> +
> +static int riscv_kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
> + struct kexec_elf_info *elf_info, unsigned long old_pbase,
> + unsigned long new_pbase)
> +{
> + int i;
> + int ret = 0;
> + size_t size;
> + struct kexec_buf kbuf;
> + const struct elf_phdr *phdr;
> +
> + kbuf.image = image;
> +
> + for (i = 0; i < ehdr->e_phnum; i++) {
> + phdr = &elf_info->proghdrs[i];
> + if (phdr->p_type != PT_LOAD)
> + continue;
> +
> + size = phdr->p_filesz;
> + if (size > phdr->p_memsz)
> + size = phdr->p_memsz;
> +
> + kbuf.buffer = (void *) elf_info->buffer + phdr->p_offset;
> + kbuf.bufsz = size;
> + kbuf.buf_align = phdr->p_align;
> + kbuf.mem = phdr->p_paddr - old_pbase + new_pbase;
> + kbuf.memsz = phdr->p_memsz;
> + kbuf.top_down = false;
> + ret = kexec_add_buffer(&kbuf);
> + if (ret)
> + break;
> + }
> +
> + return ret;
> +}
> +
> +/*
> + * Go through the available phsyical memory regions and find one that hold
> + * an image of the specified size.
> + */
> +static int elf_find_pbase(struct kimage *image, unsigned long kernel_len,
> + struct elfhdr *ehdr, struct kexec_elf_info *elf_info,
> + unsigned long *old_pbase, unsigned long *new_pbase)
> +{
> + int i;
> + int ret;
> + struct kexec_buf kbuf;
> + const struct elf_phdr *phdr;
> + unsigned long lowest_paddr = ULONG_MAX;
> + unsigned long lowest_vaddr = ULONG_MAX;
> +
> + for (i = 0; i < ehdr->e_phnum; i++) {
> + phdr = &elf_info->proghdrs[i];
> + if (phdr->p_type != PT_LOAD)
> + continue;
> +
> + if (lowest_paddr > phdr->p_paddr)
> + lowest_paddr = phdr->p_paddr;
> +
> + if (lowest_vaddr > phdr->p_vaddr)
> + lowest_vaddr = phdr->p_vaddr;
> + }
> +
> + kbuf.image = image;
> + kbuf.buf_min = lowest_paddr;
> + kbuf.buf_max = ULONG_MAX;
> +
> + /*
> + * Current riscv boot protocol requires 2MB alignment for
> + * RV64 and 4MB alignment for RV32
> + *
> + */
> + kbuf.buf_align = PMD_SIZE;
> + kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> + kbuf.memsz = ALIGN(kernel_len, PAGE_SIZE);
> + kbuf.top_down = false;
> + ret = arch_kexec_locate_mem_hole(&kbuf);
> + if (!ret) {
> + *old_pbase = lowest_paddr;
> + *new_pbase = kbuf.mem;
> + image->start = ehdr->e_entry - lowest_vaddr + kbuf.mem;
> + }
> + return ret;
> +}
> +
> +static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
> + unsigned long kernel_len, char *initrd,
> + unsigned long initrd_len, char *cmdline,
> + unsigned long cmdline_len)
> +{
> + int ret;
> + unsigned long old_kernel_pbase = ULONG_MAX;
> + unsigned long new_kernel_pbase = 0UL;
> + struct elfhdr ehdr;
> + struct kexec_elf_info elf_info;
> +
> + ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + ret = elf_find_pbase(image, kernel_len, &ehdr, &elf_info,
> + &old_kernel_pbase, &new_kernel_pbase);
> + if (ret)
> + goto out;
> +
> + pr_notice("The entry point of kernel at 0x%lx\n", image->start);
> +
> + /* Add the kernel binary to the image */
> + ret = riscv_kexec_elf_load(image, &ehdr, &elf_info,
> + old_kernel_pbase, new_kernel_pbase);
> + if (ret)
> + goto out;
> +
> + ret = load_extra_segments(image, image->start, kernel_len,
> + initrd, initrd_len, cmdline, cmdline_len);
> +out:
> + kexec_free_elf_info(&elf_info);
> + return ret ? ERR_PTR(ret) : NULL;
> +}
> +
> +
Remove extra blank lines.
> +const struct kexec_file_ops elf_kexec_ops = {
> + .probe = kexec_elf_probe,
> + .load = elf_kexec_load,
> +};
> diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c
> index 6ebd3ab5a9eb..aedb8c16a283 100644
> --- a/arch/riscv/kernel/machine_kexec_file.c
> +++ b/arch/riscv/kernel/machine_kexec_file.c
> @@ -7,6 +7,13 @@
> * Author: Liao Chang (liaochang1@...wei.com)
> */
> #include <linux/kexec.h>
> +#include <linux/elf.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/libfdt.h>
> +#include <linux/types.h>
> +#include <linux/memblock.h>
> +#include <asm/setup.h>
>
> const struct kexec_file_ops * const kexec_file_loaders[] = {
> &elf_kexec_ops,
> --
> 2.20.1
>
Thanks,
Yunhui
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