Patch adds support for ARM64 in makedumpfile. It takes care of vmalloc, vmemmap, module and directly map kernel memory region's translation.
Currently we only support 2 leverl 64K pages and VA_BITS as 42. Support to find these machine specific parameters dynamically and then to act accordingly can be added latter. Signed-off-by: Pratyush Anand <[email protected]> --- Makefile | 1 + arch/arm64.c | 255 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ makedumpfile.h | 48 +++++++++++ 3 files changed, 304 insertions(+) create mode 100644 arch/arm64.c diff --git a/Makefile b/Makefile index 2d2b1b72929a..fc21a3f0e50a 100644 --- a/Makefile +++ b/Makefile @@ -49,6 +49,7 @@ SRC_BASE = makedumpfile.c makedumpfile.h diskdump_mod.h sadump_mod.h sadump_info SRC_PART = print_info.c dwarf_info.c elf_info.c erase_info.c sadump_info.c cache.c OBJ_PART=$(patsubst %.c,%.o,$(SRC_PART)) SRC_ARCH = arch/arm.c arch/x86.c arch/x86_64.c arch/ia64.c arch/ppc64.c arch/s390x.c arch/ppc.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 OBJ_ARCH=$(patsubst %.c,%.o,$(SRC_ARCH)) LIBS = -ldw -lbz2 -lebl -ldl -lelf -lz diff --git a/arch/arm64.c b/arch/arm64.c new file mode 100644 index 000000000000..23aabf09b332 --- /dev/null +++ b/arch/arm64.c @@ -0,0 +1,255 @@ +/* + * arch/arm64.c : Based on arch/arm.c + * + * Copyright (C) 2015 Red Hat, Pratyush Anand <[email protected]> + * + * 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 (version 2 of the License). + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifdef __aarch64__ + +#include "../elf_info.h" +#include "../makedumpfile.h" +#include "../print_info.h" + +#if CONFIG_ARM64_PGTABLE_LEVELS == 2 +typedef struct { + unsigned long pgd; +} pgd_t; + +typedef struct { + pgd_t pgd; +} pud_t; + +typedef struct { + pud_t pud; +} pmd_t; + +#define pud_offset(pgd, vaddr) ((pud_t *)pgd) +#define pmd_offset(pud, vaddr) ((pmd_t *)pud) +#define pgd_val(x) ((x).pgd) +#define pud_val(x) (pgd_val((x).pgd)) +#define pmd_val(x) (pud_val((x).pud)) + +#define PUD_SHIFT PGDIR_SHIFT +#define PUD_SIZE (1UL << PUD_SHIFT) + +#endif + +typedef struct { + unsigned long pte; +} pte_t; +#define pte_val(x) ((x).pte) + +#define PAGE_SIZE (1UL << PAGE_SHIFT) +#define PAGE_MASK (~(PAGE_SIZE - 1)) +#define PGDIR_SHIFT ((PAGE_SHIFT - 3) * ARM64_PGTABLE_LEVELS + 3) +#define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT)) +#define PMD_SHIFT ((PAGE_SHIFT - 3) * 2 + 3) +#define PTRS_PER_PTE (1 << (PAGE_SHIFT - 3)) +#define PMD_SHIFT ((PAGE_SHIFT - 3) * 2 + 3) +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE - 1)) +#define PTRS_PER_PMD PTRS_PER_PTE + +#define PAGE_PRESENT (1 << 0) +#define SECTIONS_SIZE_BITS 30 +/* + +* Highest possible physical address supported. +*/ +#define PHYS_MASK_SHIFT 48 +#define PHYS_MASK ((1UL << PHYS_MASK_SHIFT) - 1) + +#define PMD_TYPE_MASK 3 +#define PMD_TYPE_SECT 1 +#define PMD_TYPE_TABLE 3 + +#define __va(paddr) ((paddr) - info->phys_base + PAGE_OFFSET) +#define __pa(vaddr) ((vaddr) - PAGE_OFFSET + info->phys_base) + +#define pgd_index(vaddr) (((vaddr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) +#define pgd_offset(pgdir, vaddr) ((pgd_t *)(pgdir) + pgd_index(vaddr)) + +#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pmd_page_vaddr(pmd) (__va(pmd_val(pmd) & PHYS_MASK & (int32_t)PAGE_MASK)) +#define pte_offset(dir, vaddr) ((pte_t*)pmd_page_vaddr((*dir)) + pte_index(vaddr)) + +/* kernel struct page size can be kernel version dependent, currently + * keep it constant. + */ +#define KERN_STRUCT_PAGE_SIZE 64 +#define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1)) +#define PFN_DOWN(x) ((x) >> PAGE_SHIFT) +#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * KERN_STRUCT_PAGE_SIZE, PUD_SIZE) +#define MODULES_END PAGE_OFFSET +#define MODULES_VADDR (MODULES_END - 0x4000000) + + +static int is_vtop_from_page_table_arm64(unsigned long vaddr) +{ + /* If virtual address lies in vmalloc, vmemmap or module space + * region then, get the physical address from page table. + */ + return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END) + || (vaddr >= VMEMMAP_START && vaddr <= VMEMMAP_END) + || (vaddr >= MODULES_VADDR && vaddr <= MODULES_END)); +} + +int get_phys_base_arm64(void) +{ + unsigned long phys_base = ULONG_MAX; + unsigned long long phys_start; + int i; + /* + * We resolve phys_base from PT_LOAD segments. LMA contains physical + * address of the segment, and we use the lowest start as + * phys_base. + */ + for (i = 0; get_pt_load(i, &phys_start, NULL, NULL, NULL); i++) { + if (phys_start < phys_base) + phys_base = phys_start; + } + + if (phys_base == ULONG_MAX) { + ERRMSG("Can't determine phys_base\n"); + return FALSE; + } + + info->phys_base = phys_base; + + DEBUG_MSG("phys_base : %lx\n", phys_base); + + return TRUE; +} + +int get_machdep_info_arm64(void) +{ + info->max_physmem_bits = PHYS_MASK_SHIFT; + info->section_size_bits = SECTIONS_SIZE_BITS; + info->page_offset = KVBASE; + info->vmalloc_start = 0xffffffffffffffffUL << VA_BITS; + info->vmalloc_end = PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - 0x10000; + info->vmemmap_start = VMALLOC_END + 0x10000; + info->vmemmap_end = VMEMMAP_START + VMEMMAP_SIZE; + + DEBUG_MSG("max_physmem_bits : %lx\n", info->max_physmem_bits); + DEBUG_MSG("section_size_bits: %lx\n", info->section_size_bits); + DEBUG_MSG("page_offset : %lx\n", info->page_offset); + DEBUG_MSG("vmalloc_start : %lx\n", info->vmalloc_start); + DEBUG_MSG("vmalloc_end : %lx\n", info->vmalloc_end); + DEBUG_MSG("vmemmap_start : %lx\n", info->vmemmap_start); + DEBUG_MSG("vmemmap_end : %lx\n", info->vmemmap_end); + DEBUG_MSG("modules_start : %lx\n", MODULES_VADDR); + DEBUG_MSG("modules_end : %lx\n", MODULES_END); + + return TRUE; +} + +unsigned long long kvtop_xen_arm64(unsigned long kvaddr) +{ + return ERROR; +} + +int get_xen_basic_info_arm64(void) +{ + return ERROR; +} + +int get_xen_info_arm64(void) +{ + return ERROR; +} + +int get_versiondep_info_arm64(void) +{ + return TRUE; +} + +/* + * vtop_arm64() - translate arbitrary virtual address to physical + * @vaddr: virtual address to translate + * + * Function translates @vaddr into physical address using page tables. This + * address can be any virtual address. Returns physical address of the + * corresponding virtual address or %NOT_PADDR when there is no translation. + */ +static unsigned long long vtop_arm64(unsigned long vaddr) +{ + unsigned long long paddr = NOT_PADDR; + pgd_t *pgda, pgdv; + pud_t *puda; + pmd_t *pmda, pmdv; + pte_t *ptea, ptev; + + 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; + } + + puda = pud_offset(pgda, vaddr); + pmda = pmd_offset(puda, vaddr); + if (!readmem(VADDR, (unsigned long long)pmda, &pmdv, sizeof(pmdv))) { + ERRMSG("Can't read pmd\n"); + return NOT_PADDR; + } + + switch (pmd_val(pmdv) & PMD_TYPE_MASK) { + case PMD_TYPE_TABLE: + ptea = pte_offset(&pmdv, vaddr); + /* 64k page */ + if (!readmem(VADDR, (unsigned long long)ptea, &ptev, sizeof(ptev))) { + ERRMSG("Can't read pte\n"); + return NOT_PADDR; + } + + if (!(pte_val(ptev) & PAGE_PRESENT)) { + ERRMSG("Can't get a valid pte.\n"); + return NOT_PADDR; + } else { + + paddr = (PAGEBASE(pte_val(ptev)) & PHYS_MASK) + + (vaddr & (PAGESIZE() - 1)); + } + break; + case PMD_TYPE_SECT: + /* 1GB section */ + paddr = (pmd_val(pmdv) & PMD_MASK) + (vaddr & (PMD_SIZE - 1)); + break; + } + + return paddr; +} + +unsigned long long vaddr_to_paddr_arm64(unsigned long vaddr) +{ + /* + * use translation tables when a) user has explicitly requested us to + * perform translation for a given address. b) virtual address lies in + * vmalloc, vmemmap or modules memory region. Otherwise we assume that + * the translation is done within the kernel direct mapped region. + */ + if ((info->vaddr_for_vtop == vaddr) || + is_vtop_from_page_table_arm64(vaddr)) + return vtop_arm64(vaddr); + + return __pa(vaddr); +} +#endif diff --git a/makedumpfile.h b/makedumpfile.h index d2fadbd1f985..92a2bb629bcb 100644 --- a/makedumpfile.h +++ b/makedumpfile.h @@ -483,6 +483,33 @@ do { \ #define VMEMMAP_START (info->vmemmap_start) #define VMEMMAP_END (info->vmemmap_end) +#ifdef __aarch64__ +#define CONFIG_ARM64_PGTABLE_LEVELS 2 +#define CONFIG_ARM64_VA_BITS 42 +#define CONFIG_ARM64_64K_PAGES 1 + +/* Currently we only suport following defines based on above + * config definitions. + * TODOs: We need to find a way to get above defines dynamically and + * then to support following definitions based on that + */ + +#if CONFIG_ARM64_PGTABLE_LEVELS == 2 +#define ARM64_PGTABLE_LEVELS 2 +#endif + +#if CONFIG_ARM64_VA_BITS == 42 +#define VA_BITS 42 +#endif + +#ifdef CONFIG_ARM64_64K_PAGES +#define PAGE_SHIFT 16 +#endif + +#define KVBASE_MASK (0xffffffffffffffffUL << (VA_BITS - 1)) +#define KVBASE (SYMBOL(_stext) & KVBASE_MASK) +#endif /* aarch64 */ + #ifdef __arm__ #define KVBASE_MASK (0xffff) #define KVBASE (SYMBOL(_stext) & ~KVBASE_MASK) @@ -761,6 +788,22 @@ do { \ */ static inline int stub_true() { return TRUE; } static inline int stub_true_ul(unsigned long x) { return TRUE; } +#ifdef __aarch64__ +int get_phys_base_arm64(void); +int get_machdep_info_arm64(void); +unsigned long long vaddr_to_paddr_arm64(unsigned long vaddr); +int get_versiondep_info_arm64(void); +int get_xen_basic_info_arm64(void); +int get_xen_info_arm64(void); +#define vaddr_to_paddr(X) vaddr_to_paddr_arm64(X) +#define get_phys_base() get_phys_base_arm64() +#define get_machdep_info() get_machdep_info_arm64() +#define get_versiondep_info() get_versiondep_info_arm64() +#define get_xen_basic_info_arch(X) get_xen_basic_info_arm64(X) +#define get_xen_info_arch(X) get_xen_info_arm64(X) +#define is_phys_addr(X) stub_true_ul(X) +#endif /* aarch64 */ + #ifdef __arm__ int get_phys_base_arm(void); int get_machdep_info_arm(void); @@ -1608,6 +1651,11 @@ struct domain_list { #define PAGES_PER_MAPWORD (sizeof(unsigned long) * 8) #define MFNS_PER_FRAME (info->page_size / sizeof(unsigned long)) +#ifdef __aarch64__ +unsigned long long kvtop_xen_arm64(unsigned long kvaddr); +#define kvtop_xen(X) kvtop_xen_arm64(X) +#endif /* aarch64 */ + #ifdef __arm__ #define kvtop_xen(X) FALSE #define get_xen_basic_info_arch(X) FALSE -- 2.1.0 _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
