[PATCH] makedumpfile: Add initial LoongArch64 support
Youling Tang
tangyouling at loongson.cn
Sun Sep 18 21:47:17 PDT 2022
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>
---
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;
--
2.36.0
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