[PATCH 3/3] add ARM crashdump support
Masayuki Igawa
igawa at mxs.nes.nec.co.jp
Thu Jun 24 03:33:56 EDT 2010
Hi, Mika.
On Tue, 22 Jun 2010 09:59:12 +0300, Mika Westerberg wrote:
> This patch adds support for processing ARM kernel crashdumps as well.
>
> Signed-off-by: Mika Westerberg <ext-mika.1.westerberg at nokia.com>
> ---
> Makefile | 4 +-
> arm.c | 200 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> makedumpfile.h | 33 +++++++++
> 3 files changed, 235 insertions(+), 2 deletions(-)
> create mode 100644 arm.c
>
> diff --git a/Makefile b/Makefile
> index 4a8a060..3d2ee34 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -23,8 +23,8 @@ CFLAGS_ARCH += -m64
> endif
>
> SRC = makedumpfile.c makedumpfile.h diskdump_mod.h
> -SRC_ARCH = x86.c x86_64.c ia64.c ppc64.c
> -OBJ_ARCH = x86.o x86_64.o ia64.o ppc64.o
> +SRC_ARCH = arm.c x86.c x86_64.c ia64.c ppc64.c
> +OBJ_ARCH = arm.o x86.o x86_64.o ia64.o ppc64.o
>
> all: makedumpfile
>
> diff --git a/arm.c b/arm.c
> new file mode 100644
> index 0000000..5acad78
> --- /dev/null
> +++ b/arm.c
> @@ -0,0 +1,200 @@
> +/*
> + * arm.c
> + *
> + * Created by: Mika Westerberg <ext-mika.1.westerberg at nokia.com>
> + * Copyright (C) 2010 Nokia Corporation
> + *
> + * 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 __arm__
> +
> +#include "makedumpfile.h"
> +
> +#define PMD_TYPE_MASK 3
> +#define PMD_TYPE_SECT 2
> +#define PMD_TYPE_TABLE 1
> +
> +#define pgd_index(vaddr) ((vaddr) >> PGDIR_SHIFT)
> +#define pte_index(vaddr) ((vaddr >> PAGESHIFT()) & (PTRS_PER_PTE - 1))
> +
> +#define pgd_offset(pgdir, vaddr) \
> + ((pgdir) + pgd_index(vaddr) * 2 * sizeof(unsigned long))
> +#define pmd_offset(dir, vaddr) (dir)
> +#define pte_offset(pmd, vaddr) \
> + (pmd_page_vaddr(pmd) + pte_index(vaddr) * sizeof(unsigned long))
> +
> +/*
> + * These only work for kernel directly mapped addresses.
> + */
> +#define __va(paddr) ((paddr) - info->phys_base + info->page_offset)
> +#define __pa(vaddr) ((vaddr) - info->page_offset + info->phys_base)
> +
> +static inline unsigned long
> +pmd_page_vaddr(unsigned long pmd)
> +{
> + unsigned long ptr;
> +
> + ptr = pmd & ~(PTRS_PER_PTE * sizeof(void *) - 1);
> + ptr += PTRS_PER_PTE * sizeof(void *);
> +
> + return __va(ptr);
> +}
> +
> +int
> +get_phys_base_arm(void)
> +{
> + unsigned long phys_base = ULONG_MAX;
> + int i;
> +
> + /*
> + * We resolve phys_base from PT_LOAD segments. LMA contains physical
> + * address of the segment, and we use the first one.
> + */
> + for (i = 0; i < info->num_load_memory; i++) {
> + const struct pt_load_segment *pls = &info->pt_load_segments[i];
> +
> + if (pls->phys_start < phys_base)
> + phys_base = pls->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_arm(void)
> +{
> + unsigned long vmlist, vmalloc_start;
> +
> + info->page_offset = __PAGE_OFFSET;
> + info->max_physmem_bits = _MAX_PHYSMEM_BITS;
> + info->kernel_start = SYMBOL(_stext);
> + info->section_size_bits = _SECTION_SIZE_BITS;
> +
> + /*
> + * For the compatibility, makedumpfile should run without the symbol
> + * vmlist and the offset of vm_struct.addr if they are not necessary.
> + */
> + if ((SYMBOL(vmlist) == NOT_FOUND_SYMBOL) ||
> + OFFSET(vm_struct.addr) == NOT_FOUND_STRUCTURE) {
> + return TRUE;
> + }
> +
> + if (!readmem(VADDR, SYMBOL(vmlist), &vmlist, sizeof(vmlist))) {
> + ERRMSG("Can't get vmlist.\n");
> + return FALSE;
> + }
> + if (!readmem(VADDR, vmlist + OFFSET(vm_struct.addr), &vmalloc_start,
> + sizeof(vmalloc_start))) {
> + ERRMSG("Can't get vmalloc_start.\n");
> + return FALSE;
> + }
> +
> + info->vmalloc_start = vmalloc_start;
> +
> + DEBUG_MSG("page_offset : %lx\n", info->page_offset);
> + DEBUG_MSG("kernel_start : %lx\n", info->kernel_start);
> + DEBUG_MSG("vmalloc_start: %lx\n", vmalloc_start);
> +
> + return TRUE;
> +}
> +
> +static int
> +is_vmalloc_addr_arm(unsigned long vaddr)
> +{
> + return (info->vmalloc_start && vaddr >= info->vmalloc_start);
> +}
> +
> +/*
> + * vtop_arm() - 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_arm(unsigned long vaddr)
> +{
> + unsigned long long paddr = NOT_PADDR;
> + unsigned long ptr, pgd, pte, pmd;
> +
> + if (SYMBOL(swapper_pg_dir) == NOT_FOUND_SYMBOL) {
> + ERRMSG("Can't get the symbol of swapper_pg_dir.\n");
> + return NOT_PADDR;
> + }
> +
> + ptr = pgd_offset(SYMBOL(swapper_pg_dir), vaddr);
> + if (!readmem(VADDR, ptr, &pgd, sizeof(pmd))) {
> + ERRMSG("Can't read pgd\n");
> + return NOT_PADDR;
> + }
> +
> + if (info->vaddr_for_vtop == vaddr)
> + MSG(" PGD : %08lx => %08lx\n", ptr, pgd);
> +
> + pmd = pmd_offset(pgd, vaddr);
> +
> + switch (pmd & PMD_TYPE_MASK) {
> + case PMD_TYPE_TABLE: {
> + /* 4k small page */
> + ptr = pte_offset(pmd, vaddr);
> + if (!readmem(VADDR, ptr, &pte, sizeof(pte))) {
> + ERRMSG("Can't read pte\n");
> + return NOT_PADDR;
> + }
> +
> + if (info->vaddr_for_vtop == vaddr)
> + MSG(" PTE : %08lx => %08lx\n", ptr, pte);
> +
> + if (!(pte & _PAGE_PRESENT)) {
> + ERRMSG("Can't get a valid pte.\n");
> + return NOT_PADDR;
> + }
> +
> + paddr = PAGEBASE(pte) + (vaddr & (PAGESIZE() - 1));
> + break;
> + }
> +
> + case PMD_TYPE_SECT:
> + /* 1MB section */
> + pte = pmd & PMD_MASK;
> + paddr = pte + (vaddr & (PMD_SIZE - 1));
> + break;
> + }
> +
> + return paddr;
> +}
> +
> +unsigned long long
> +vaddr_to_paddr_arm(unsigned long vaddr)
> +{
> + unsigned long long paddr;
> +
> + if ((paddr = vaddr_to_paddr_general(vaddr)) != NOT_PADDR)
> + return paddr;
Here is a checkpatche.pl's error.
====
ERROR: do not use assignment in if condition
#303: FILE: arm.c:189:
+ if ((paddr = vaddr_to_paddr_general(vaddr)) != NOT_PADDR)
total: 1 errors, 0 warnings, 261 lines checked
====
How about is this?
====
+unsigned long long
+vaddr_to_paddr_arm(unsigned long vaddr)
+{
+ unsigned long long paddr = vaddr_to_paddr_general(vaddr);
+
+ if (paddr != NOT_PADDR)
+ return paddr;
====
BTW, I'm testing these patches for x86/x86_64 arch now.
I'll merge these patches after my testing.
But I cannot test for ARM because have no test machines of ARM.
Thanks.
-- Masayuki Igawa
> +
> + if (is_vmalloc_addr_arm(vaddr))
> + paddr = vtop_arm(vaddr);
> + else
> + paddr = __pa(vaddr);
> +
> + return paddr;
> +}
> +
> +#endif /* __arm__ */
> diff --git a/makedumpfile.h b/makedumpfile.h
> index 2717d81..8a74b34 100644
> --- a/makedumpfile.h
> +++ b/makedumpfile.h
> @@ -506,6 +506,24 @@ do { \
> #define VMEMMAP_START (info->vmemmap_start)
> #define VMEMMAP_END (info->vmemmap_end)
>
> +#ifdef __arm__
> +#define __PAGE_OFFSET (0xc0000000)
> +#define KVBASE_MASK (0xffff)
> +#define KVBASE (SYMBOL(_stext) & ~KVBASE_MASK)
> +#define _SECTION_SIZE_BITS (28)
> +#define _MAX_PHYSMEM_BITS (32)
> +#define ARCH_PFN_OFFSET (info->phys_base >> PAGESHIFT())
> +
> +#define PTRS_PER_PTE (512)
> +#define PGDIR_SHIFT (21)
> +#define PMD_SHIFT (21)
> +#define PMD_SIZE (1UL << PMD_SHIFT)
> +#define PMD_MASK (~(PMD_SIZE - 1))
> +
> +#define _PAGE_PRESENT (1 << 0)
> +
> +#endif /* arm */
> +
> #ifdef __x86__
> #define __PAGE_OFFSET (0xc0000000)
> #define __VMALLOC_RESERVE (128 << 20)
> @@ -653,6 +671,16 @@ do { \
> /*
> * The function of dependence on machine
> */
> +#ifdef __arm__
> +int get_phys_base_arm(void);
> +int get_machdep_info_arm(void);
> +unsigned long long vaddr_to_paddr_arm(unsigned long vaddr);
> +#define get_phys_base() get_phys_base_arm()
> +#define get_machdep_info() get_machdep_info_arm()
> +#define get_versiondep_info() TRUE
> +#define vaddr_to_paddr(X) vaddr_to_paddr_arm(X)
> +#endif /* arm */
> +
> #ifdef __x86__
> int get_machdep_info_x86(void);
> int get_versiondep_info_x86(void);
> @@ -1148,6 +1176,11 @@ struct domain_list {
> #define PAGES_PER_MAPWORD (sizeof(unsigned long) * 8)
> #define MFNS_PER_FRAME (info->page_size / sizeof(unsigned long))
>
> +#ifdef __arm__
> +#define kvtop_xen(X) FALSE
> +#define get_xen_info_arch(X) FALSE
> +#endif /* arm */
> +
> #ifdef __x86__
> #define HYPERVISOR_VIRT_START_PAE (0xF5800000UL)
> #define HYPERVISOR_VIRT_START (0xFC000000UL)
> --
> 1.5.6.5
>
>
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