Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261801AbVC1Nc0 (ORCPT ); Mon, 28 Mar 2005 08:32:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261786AbVC1Nao (ORCPT ); Mon, 28 Mar 2005 08:30:44 -0500 Received: from e2.ny.us.ibm.com ([32.97.182.142]:2274 "EHLO e2.ny.us.ibm.com") by vger.kernel.org with ESMTP id S261801AbVC1N1p (ORCPT ); Mon, 28 Mar 2005 08:27:45 -0500 Subject: [RFC/PATCH 16/17][Kdump] Accessing dump file in linear raw format (/dev/oldmem) From: Vivek Goyal To: Andrew Morton , lkml Cc: "Eric W. Biederman" , fastboot Content-Type: multipart/mixed; boundary="=-P/dqQIiJvQ52DvDDlWar" Date: Mon, 28 Mar 2005 18:57:35 +0530 Message-Id: <1112016455.4001.87.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-3) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5051 Lines: 166 --=-P/dqQIiJvQ52DvDDlWar Content-Type: text/plain Content-Transfer-Encoding: 7bit --=-P/dqQIiJvQ52DvDDlWar Content-Disposition: attachment; filename=crashdump-linear-raw-format-dump-file-access.patch Content-Type: text/x-patch; name=crashdump-linear-raw-format-dump-file-access.patch; charset=UTF-8 Content-Transfer-Encoding: 7bit From: Hariprasad Nellitheertha This patch contains the code that enables us to access the previous kernel's memory as /dev/oldmem. Signed-off-by: Eric Biederman Signed-off-by: Andrew Morton --- linux-2.6.12-rc1-mm3-1M-root/Documentation/devices.txt | 1 linux-2.6.12-rc1-mm3-1M-root/drivers/char/mem.c | 74 +++++++++++++++++ 2 files changed, 75 insertions(+) diff -puN Documentation/devices.txt~crashdump-linear-raw-format-dump-file-access Documentation/devices.txt --- linux-2.6.12-rc1-mm3-1M/Documentation/devices.txt~crashdump-linear-raw-format-dump-file-access 2005-03-27 18:36:32.000000000 +0530 +++ linux-2.6.12-rc1-mm3-1M-root/Documentation/devices.txt 2005-03-27 18:36:32.000000000 +0530 @@ -94,6 +94,7 @@ Your cooperation is appreciated. 9 = /dev/urandom Faster, less secure random number gen. 10 = /dev/aio Asyncronous I/O notification interface 11 = /dev/kmsg Writes to this come out as printk's + 12 = /dev/oldmem Access to crash dump from kexec kernel 1 block RAM disk 0 = /dev/ram0 First RAM disk 1 = /dev/ram1 Second RAM disk diff -puN drivers/char/mem.c~crashdump-linear-raw-format-dump-file-access drivers/char/mem.c --- linux-2.6.12-rc1-mm3-1M/drivers/char/mem.c~crashdump-linear-raw-format-dump-file-access 2005-03-27 18:36:32.000000000 +0530 +++ linux-2.6.12-rc1-mm3-1M-root/drivers/char/mem.c 2005-03-27 18:36:32.000000000 +0530 @@ -23,6 +23,8 @@ #include #include #include +#include +#include #include #include @@ -273,6 +275,62 @@ static int mmap_kmem(struct file * file, return mmap_mem(file, vma); } +#ifdef CONFIG_CRASH_DUMP +/* + * Read memory corresponding to the old kernel. + * If we are reading from the reserved section, which is + * actually used by the current kernel, we just return zeroes. + * Or if we are reading from the first 640k, we return from the + * backed up area. + */ +static ssize_t read_oldmem(struct file * file, char * buf, + size_t count, loff_t *ppos) +{ + unsigned long pfn; + unsigned backup_start, backup_end, relocate_start; + size_t read=0, csize; + + backup_start = CRASH_BACKUP_BASE / PAGE_SIZE; + backup_end = backup_start + (CRASH_BACKUP_SIZE / PAGE_SIZE); + relocate_start = (CRASH_BACKUP_BASE + CRASH_BACKUP_SIZE) / PAGE_SIZE; + + while(count) { + pfn = *ppos / PAGE_SIZE; + + csize = (count > PAGE_SIZE) ? PAGE_SIZE : count; + + /* Perform translation (see comment above) */ + if ((pfn >= backup_start) && (pfn < backup_end)) { + if (clear_user(buf, csize)) { + read = -EFAULT; + goto done; + } + + goto copy_done; + } else if (pfn < (CRASH_RELOCATE_SIZE / PAGE_SIZE)) + pfn += relocate_start; + + if (pfn > saved_max_pfn) { + read = 0; + goto done; + } + + if (copy_oldmem_page(pfn, buf, csize, 1)) { + read = -EFAULT; + goto done; + } + +copy_done: + buf += csize; + *ppos += csize; + read += csize; + count -= csize; + } +done: + return read; +} +#endif + extern long vread(char *buf, char *addr, unsigned long count); extern long vwrite(char *buf, char *addr, unsigned long count); @@ -720,6 +778,7 @@ static int open_port(struct inode * inod #define read_full read_zero #define open_mem open_port #define open_kmem open_mem +#define open_oldmem open_mem static struct file_operations mem_fops = { .llseek = memory_lseek, @@ -769,6 +828,13 @@ static struct file_operations full_fops .write = write_full, }; +#ifdef CONFIG_CRASH_DUMP +static struct file_operations oldmem_fops = { + .read = read_oldmem, + .open = open_oldmem, +}; +#endif + static ssize_t kmsg_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { @@ -824,6 +890,11 @@ static int memory_open(struct inode * in case 11: filp->f_op = &kmsg_fops; break; +#ifdef CONFIG_CRASH_DUMP + case 12: + filp->f_op = &oldmem_fops; + break; +#endif default: return -ENXIO; } @@ -853,6 +924,9 @@ static const struct { {8, "random", S_IRUGO | S_IWUSR, &random_fops}, {9, "urandom", S_IRUGO | S_IWUSR, &urandom_fops}, {11,"kmsg", S_IRUGO | S_IWUSR, &kmsg_fops}, +#ifdef CONFIG_CRASH_DUMP + {12,"oldmem", S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops}, +#endif }; static struct class *mem_class; _ --=-P/dqQIiJvQ52DvDDlWar-- - 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/