[PATCH] makedumpfile: Add initial LoongArch64 support
HAGIO KAZUHITO(萩尾 一仁)
k-hagio-ab at nec.com
Tue Sep 20 19:57:17 PDT 2022
On 2022/09/19 13:47, Youling Tang wrote:
> Patch adds support for LoongArch64 in makedumpfile. It takes care of
> vmalloc, module and directly map kernel memory region's translation.
> Currently we only support 3 leverl 16K pages and VA_BITS as 48.
>
> The changes were tested on a LoongArch64 Loongson-3A5000 processor.
> The dump compression and filtering (for all dump levels 1,2,4,8,16
> and 31) tests are succussfull.
>
> Signed-off-by: Youling Tang <tangyouling at loongson.cn>
Looks good, applied with adjusting a few indents:
https://github.com/makedumpfile/makedumpfile/commit/787a23ebc9d948f036aefb044f94e54facccc5af
Thanks,
Kazu
> ---
> Note: kexec/kdump support patch see link [1]:
> [1] Link: https://lore.kernel.org/loongarch/1663210426-15446-1-git-send-email-tangyouling@loongson.cn/T/#t
>
> Makefile | 2 +-
> arch/loongarch64.c | 113 +++++++++++++++++++++++++++++++++++++++++++++
> makedumpfile.h | 58 +++++++++++++++++++++++
> 3 files changed, 172 insertions(+), 1 deletion(-)
> create mode 100644 arch/loongarch64.c
>
> diff --git a/Makefile b/Makefile
> index 370a97c..e07f466 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -47,7 +47,7 @@ endif
> SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info.h
> SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c tools.c printk.c detect_cycle.c
> OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART))
> -SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c arch/mips64.c
> +SRC_ARCH = arch/arm.c arch/arm64.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.c arch/sparc64.c arch/mips64.c arch/loongarch64.c
> OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH))
>
> LIBS = -ldw -lbz2 -ldl -lelf -lz
> diff --git a/arch/loongarch64.c b/arch/loongarch64.c
> new file mode 100644
> index 0000000..42a02ab
> --- /dev/null
> +++ b/arch/loongarch64.c
> @@ -0,0 +1,113 @@
> +/*
> + * loongarch64.c
> + *
> + * Copyright (C) 2022 Loongson Technology Corporation Limited
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +#ifdef __loongarch64__
> +
> +#include "../print_info.h"
> +#include "../elf_info.h"
> +#include "../makedumpfile.h"
> +
> +int
> +get_phys_base_loongarch64(void)
> +{
> + info->phys_base = 0ULL;
> +
> + DEBUG_MSG("phys_base : %lx\n", info->phys_base);
> +
> + return TRUE;
> +}
> +
> +int
> +get_machdep_info_loongarch64(void)
> +{
> + info->section_size_bits = _SECTION_SIZE_BITS;
> +
> + /* Check if we can get MAX_PHYSMEM_BITS from vmcoreinfo */
> + if (NUMBER(MAX_PHYSMEM_BITS) != NOT_FOUND_NUMBER)
> + info->max_physmem_bits = NUMBER(MAX_PHYSMEM_BITS);
> + else
> + info->max_physmem_bits = _MAX_PHYSMEM_BITS;
> +
> + /* Check if we can get SECTION_SIZE_BITS from vmcoreinfo */
> + if (NUMBER(SECTION_SIZE_BITS) != NOT_FOUND_NUMBER)
> + info->section_size_bits = NUMBER(SECTION_SIZE_BITS);
> + else
> + info->section_size_bits = _SECTION_SIZE_BITS;
> +
> + DEBUG_MSG("max_physmem_bits : %ld\n", info->max_physmem_bits);
> + DEBUG_MSG("section_size_bits: %ld\n", info->section_size_bits);
> +
> + return TRUE;
> +}
> +
> +int
> +get_versiondep_info_loongarch64(void)
> +{
> + info->page_offset = _PAGE_OFFSET;
> +
> + DEBUG_MSG("page_offset : %lx\n", info->page_offset);
> +
> + return TRUE;
> +}
> +
> +unsigned long long
> +vaddr_to_paddr_loongarch64(unsigned long vaddr)
> +{
> + unsigned long long paddr = NOT_PADDR;
> + pgd_t *pgda, pgdv;
> + pmd_t *pmda, pmdv;
> + pte_t *ptea, ptev;
> +
> + if (vaddr >= _XKPRANGE && vaddr < _XKVRANGE)
> + return vaddr & ((1ULL << MAX_PHYSMEM_BITS()) - 1);
> +
> + if (SYMBOL(swapper_pg_dir) == NOT_FOUND_SYMBOL) {
> + ERRMSG("Can't get the symbol of swapper_pg_dir.\n");
> + return NOT_PADDR;
> + }
> +
> + pgda = pgd_offset(SYMBOL(swapper_pg_dir), vaddr);
> + if (!readmem(VADDR, (unsigned long long)pgda, &pgdv, sizeof(pgdv))) {
> + ERRMSG("Can't read pgd\n");
> + return NOT_PADDR;
> + }
> +
> + pmda = pmd_offset(&pgdv, vaddr);
> + if (!readmem(VADDR, (unsigned long long)pmda, &pmdv, sizeof(pmdv))) {
> + ERRMSG("Can't read pmd\n");
> + return NOT_PADDR;
> + }
> +
> + if (pmdv & _PAGE_HUGE) {
> + paddr = (pmdv & PMD_MASK) + (vaddr & (PMD_SIZE - 1));
> + return paddr;
> + }
> +
> + ptea = pte_offset(&pmdv, vaddr);
> + if (!readmem(VADDR, (unsigned long long)ptea, &ptev, sizeof(ptev))) {
> + ERRMSG("Can't read pte\n");
> + return NOT_PADDR;
> + }
> +
> + if (!(ptev & _PAGE_PRESENT)) {
> + ERRMSG("Can't get a valid pte.\n");
> + return NOT_PADDR;
> + }
> +
> + paddr = PAGEBASE(ptev) + (vaddr & (PAGESIZE() - 1));
> + return paddr;
> +}
> +
> +#endif /* loongarch64 */
> diff --git a/makedumpfile.h b/makedumpfile.h
> index 49b9242..a70b1de 100644
> --- a/makedumpfile.h
> +++ b/makedumpfile.h
> @@ -1013,6 +1013,42 @@ typedef unsigned long pgd_t;
>
> #endif /* mips64 */
>
> +#ifdef __loongarch64__
> +#define KVBASE (0x8000000000000000ULL)
> +#define _PAGE_OFFSET (0x9000000000000000ULL)
> +#define _XKPRANGE (0x8000000000000000ULL)
> +#define _XKVRANGE (0xc000000000000000ULL)
> +#define _SECTION_SIZE_BITS (29)
> +#define _MAX_PHYSMEM_BITS (48)
> +#define _PAGE_HUGE (1 << 6) /* HUGE is a PMD bit */
> +#define _PAGE_PRESENT (1 << 7)
> +
> +typedef unsigned long pte_t;
> +typedef unsigned long pmd_t;
> +typedef unsigned long pgd_t;
> +
> +#define PAGE_MASK (~(PAGESIZE() - 1))
> +#define PMD_MASK (~(PMD_SIZE - 1))
> +#define PMD_SHIFT ((PAGESHIFT() - 3) * 2 + 3)
> +#define PMD_SIZE (1UL << PMD_SHIFT)
> +#define PGDIR_SHIFT ((PAGESHIFT() - 3) * 3 + 3)
> +#define PTRS_PER_PTE (1 << (PAGESHIFT() - 3))
> +#define PTRS_PER_PMD PTRS_PER_PTE
> +#define PTRS_PER_PGD PTRS_PER_PTE
> +
> +#define pte_index(vaddr) (((vaddr) >> PAGESHIFT()) & (PTRS_PER_PTE - 1))
> +#define pmd_page_paddr(pmd) (pmd & (int32_t)PAGE_MASK)
> +#define pte_offset(dir, vaddr) ((pte_t *)pmd_page_paddr((*dir)) + pte_index(vaddr))
> +
> +#define pmd_index(vaddr) (((vaddr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
> +#define pgd_page_paddr(pgd) (pgd & (int32_t)PAGE_MASK)
> +#define pmd_offset(pgd, vaddr) ((pmd_t *)pgd_page_paddr((*pgd)) + pmd_index(vaddr))
> +
> +#define pgd_index(vaddr) (((vaddr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
> +#define pgd_offset(pgdir, vaddr) ((pgd_t *)(pgdir) + pgd_index(vaddr))
> +
> +#endif /* loongarch64 */
> +
> /*
> * The function of dependence on machine
> */
> @@ -1184,6 +1220,22 @@ unsigned long long vaddr_to_paddr_mips64(unsigned long vaddr);
> #define arch_crashkernel_mem_size() stub_false()
> #endif /* mips64 */
>
> +#ifdef __loongarch64__ /* loongarch64 */
> +int get_phys_base_loongarch64(void);
> +int get_machdep_info_loongarch64(void);
> +int get_versiondep_info_loongarch64(void);
> +unsigned long long vaddr_to_paddr_loongarch64(unsigned long vaddr);
> +#define find_vmemmap() stub_false()
> +#define get_phys_base() get_phys_base_loongarch64()
> +#define get_machdep_info() get_machdep_info_loongarch64()
> +#define get_versiondep_info() get_versiondep_info_loongarch64()
> +#define get_kaslr_offset(X) stub_false()
> +#define vaddr_to_paddr(X) vaddr_to_paddr_loongarch64(X)
> +#define paddr_to_vaddr(X) paddr_to_vaddr_general(X)
> +#define is_phys_addr(X) stub_true_ul(X)
> +#define arch_crashkernel_mem_size() stub_false()
> +#endif /* loongarch64 */
> +
> typedef unsigned long long mdf_pfn_t;
>
> #ifndef ARCH_PFN_OFFSET
> @@ -2318,6 +2370,12 @@ int get_xen_info_ia64(void);
> #define get_xen_info_arch(X) FALSE
> #endif /* mips64 */
>
> +#ifdef __loongarch64__ /* loongarch64 */
> +#define kvtop_xen(X) FALSE
> +#define get_xen_basic_info_arch(X) FALSE
> +#define get_xen_info_arch(X) FALSE
> +#endif /* loongarch64 */
> +
> struct cycle {
> mdf_pfn_t start_pfn;
> mdf_pfn_t end_pfn;
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