Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759921AbXHVMOB (ORCPT ); Wed, 22 Aug 2007 08:14:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758111AbXHVMNy (ORCPT ); Wed, 22 Aug 2007 08:13:54 -0400 Received: from TYO202.gate.nec.co.jp ([202.32.8.206]:42481 "EHLO tyo202.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758102AbXHVMNx (ORCPT ); Wed, 22 Aug 2007 08:13:53 -0400 To: Andrew Morton Cc: lkml , kexec-ml , Neil Horman , Vivek Goyal , Bernhard Walle , Don Zickus , Dan Aloni Subject: [PATCH 2/3] [kexec-tools] Pass vmcoreinfo's address and size In-reply-to: <20070822210838oomichi@mail.jp.nec.com> Message-Id: <20070822211339oomichi@mail.jp.nec.com> References: <20070822210838oomichi@mail.jp.nec.com> Mime-Version: 1.0 X-Mailer: WeMail32[2.51] ID:5W0000 From: "Ken'ichi Ohmichi" Date: Wed, 22 Aug 2007 21:13:39 +0900 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4118 Lines: 122 [2/3] [kexec-tools] Pass vmcoreinfo's address and size The patch is for kexec-tools-testing-20070330. (http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/) kexec command gets the address and size of the vmcoreinfo data from /sys/kernel/vmcoreinfo, and passes them to the second kernel through ELF header of /proc/vmcore. When the second kernel is booting, the kernel gets them from the ELF header and creates vmcoreinfo's PT_NOTE segment into /proc/vmcore. Thanks Ken'ichi Ohmichi --- Signed-off-by: Dan Aloni Signed-off-by: Ken'ichi Ohmichi --- diff -rpuN backup/kexec-tools-testing-20070330/kexec/crashdump-elf.c kexec-tools/kexec/crashdump-elf.c --- backup/kexec-tools-testing-20070330/kexec/crashdump-elf.c 2007-03-30 13:34:36.000000000 +0900 +++ kexec-tools/kexec/crashdump-elf.c 2007-08-03 14:45:47.000000000 +0900 @@ -36,6 +36,8 @@ int FUNC(struct kexec_info *info, char *bufp; long int nr_cpus = 0; uint64_t notes_addr, notes_len; + uint64_t vmcoreinfo_addr, vmcoreinfo_len; + int has_vmcoreinfo = 0; int (*get_note_info)(int cpu, uint64_t *addr, uint64_t *len); if (xen_present()) @@ -47,7 +49,11 @@ int FUNC(struct kexec_info *info, return -1; } - sz = sizeof(EHDR) + nr_cpus * sizeof(PHDR) + ranges * sizeof(PHDR); + if (get_kernel_vmcoreinfo(&vmcoreinfo_addr, &vmcoreinfo_len) == 0) { + has_vmcoreinfo = 1; + } + + sz = sizeof(EHDR) + (nr_cpus + has_vmcoreinfo) * sizeof(PHDR) + ranges * sizeof(PHDR); /* * Certain architectures such as x86_64 and ia64 require a separate @@ -148,6 +154,21 @@ int FUNC(struct kexec_info *info, dfprintf_phdr(stdout, "Elf header", phdr); } + if (has_vmcoreinfo) { + phdr = (PHDR *) bufp; + bufp += sizeof(PHDR); + phdr->p_type = PT_NOTE; + phdr->p_flags = 0; + phdr->p_offset = phdr->p_paddr = vmcoreinfo_addr; + phdr->p_vaddr = 0; + phdr->p_filesz = phdr->p_memsz = vmcoreinfo_len; + /* Do we need any alignment of segments? */ + phdr->p_align = 0; + + (elf->e_phnum)++; + dfprintf_phdr(stdout, "vmcoreinfo header", phdr); + } + /* Setup an PT_LOAD type program header for the region where * Kernel is mapped if info->kern_size is non-zero. */ diff -rpuN backup/kexec-tools-testing-20070330/kexec/crashdump.c kexec-tools/kexec/crashdump.c --- backup/kexec-tools-testing-20070330/kexec/crashdump.c 2007-03-30 13:34:36.000000000 +0900 +++ kexec-tools/kexec/crashdump.c 2007-08-03 14:45:05.000000000 +0900 @@ -108,3 +108,35 @@ int get_crash_notes_per_cpu(int cpu, uin return 0; } + +/* Returns the physical address of start of crash notes buffer for a kernel. */ +int get_kernel_vmcoreinfo(uint64_t *addr, uint64_t *len) +{ + char kdump_info[PATH_MAX]; + char line[MAX_LINE]; + int count; + FILE *fp; + unsigned long long temp, temp2; + + *addr = 0; + *len = 0; + + sprintf(kdump_info, "/sys/kernel/vmcoreinfo"); + fp = fopen(kdump_info, "r"); + if (!fp) { + die("Could not open \"%s\": %s\n", kdump_info, + strerror(errno)); + return -1; + } + + if (!fgets(line, sizeof(line), fp)) + die("Cannot parse %s: %s\n", kdump_info, strerror(errno)); + count = sscanf(line, "%Lx %Lx", &temp, &temp2); + if (count != 2) + die("Cannot parse %s: %s\n", kdump_info, strerror(errno)); + + *addr = (uint64_t) temp; + *len = (uint64_t) temp2; + + return 0; +} diff -rpuN backup/kexec-tools-testing-20070330/kexec/crashdump.h kexec-tools/kexec/crashdump.h --- backup/kexec-tools-testing-20070330/kexec/crashdump.h 2007-03-30 13:34:36.000000000 +0900 +++ kexec-tools/kexec/crashdump.h 2007-08-03 14:45:05.000000000 +0900 @@ -2,6 +2,7 @@ #define CRASHDUMP_H extern int get_crash_notes_per_cpu(int cpu, uint64_t *addr, uint64_t *len); +extern int get_kernel_vmcoreinfo(uint64_t *addr, uint64_t *len); /* Need to find a better way to determine per cpu notes section size. */ #define MAX_NOTE_BYTES 1024 _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/