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/*
* zgetdump - Tool for copying and converting System z dumps
*
* /dev/mem and /dev/crash dump input format
*
* Copyright IBM Corp. 2012, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include <fcntl.h>
#include <limits.h>
#include <linux/fs.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <time.h>
#include <unistd.h>
#include "zgetdump.h"
#include "df_s390.h"
#include "dfi.h"
#include "dfi_mem_chunk.h"
/*
* Add live dump magic to buffer
*/
static void add_live_magic(void *buf, u64 off, u64 cnt)
{
if (off >= sizeof(dfi_live_dump_magic))
return;
memcpy(buf, &dfi_live_dump_magic,
MIN(cnt, sizeof(dfi_live_dump_magic)));
}
/*
* "devmem" mem chunk read callback
*
* This functions reads page wise in order to detect unreadable pages
*/
static void dfi_devmem_mem_chunk_read(struct dfi_mem_chunk *mem_chunk, u64 off,
void *buf, u64 cnt)
{
u64 copied = 0, len = PAGE_SIZE;
(void) mem_chunk;
if (off % PAGE_SIZE)
len = MIN(len, PAGE_SIZE - off % PAGE_SIZE);
len = MIN(len, cnt);
do {
zg_seek(g.fh, mem_chunk->start + off + copied, ZG_CHECK);
if (zg_read(g.fh, buf + copied, len, ZG_CHECK_NONE) < 0) {
if (errno == EFAULT) {
/* This can happen when using CMM */
memset(buf + copied, 0, len);
} else {
ERR_EXIT_ERRNO("Could not read %s",
g.opts.device);
}
}
copied += len;
len = MIN(PAGE_SIZE, cnt - copied);
} while (len);
add_live_magic(buf, mem_chunk->start + off, cnt);
}
/*
* Detect memory chunks via /proc/iomem
*
* check = 0: Initialize memory map
* check = 1: Verifiy that current system memory map is same as DFI memory map
*/
static int detect_mem_chunks(int check)
{
char line[4096], type1[4096], type2[4096];
unsigned long start, end, cnt = 0;
struct dfi_mem_chunk *mem_chunk;
struct zg_fh *fh;
ssize_t rc;
fh = zg_open("/proc/iomem", O_RDONLY, ZG_CHECK);
do {
rc = zg_gets(fh, line, sizeof(line), ZG_CHECK);
if (rc == 0)
break;
sscanf(line, "%lx-%lx : %s %s", &start, &end, type1, type2);
if (strcmp(type1, "System") != 0)
continue;
if (strcmp(type2, "RAM") != 0 && strcmp(type2, "ROM") != 0)
continue;
if (check) {
mem_chunk = dfi_mem_chunk_find(start);
if (!mem_chunk)
return -EINVAL;
if (mem_chunk->start != start)
return -EINVAL;
if (mem_chunk->end != end)
return -EINVAL;
cnt++;
} else {
dfi_mem_chunk_add(start, end - start + 1, NULL,
dfi_devmem_mem_chunk_read, NULL);
}
} while (1);
if (check && cnt != dfi_mem_chunk_cnt())
return -EINVAL;
return 0;
}
/*
* Verify architecture of running system
*/
static void check_system_arch(void)
{
struct utsname utsname;
uname(&utsname);
if (memcmp(utsname.machine, "s390x", 5) != 0)
ERR_EXIT("Dump architecture \"%s\" is not supported",
utsname.machine);
}
/*
* Initialize devmem DFI
*/
static int dfi_devmem_init(void)
{
if (strcmp(g.fh->path, "/dev/mem") != 0 &&
strcmp(g.fh->path, "/dev/crash") != 0)
return -ENODEV;
check_system_arch();
dfi_cpu_info_init(DFI_CPU_CONTENT_NONE);
detect_mem_chunks(0);
dfi_attr_dump_method_set(DFI_DUMP_METHOD_LIVE);
zg_seek(g.fh, 0, ZG_CHECK);
return 0;
}
/*
* Cleanup devmem DFI
*/
static void dfi_devmem_exit(void)
{
if (detect_mem_chunks(1))
STDERR("Warning: memory map has changed\n");
}
/*
* devmem DFI operations
*/
struct dfi dfi_devmem = {
.name = "devmem",
.init = dfi_devmem_init,
.exit = dfi_devmem_exit,
.feat_bits = DFI_FEAT_COPY | DFI_FEAT_SEEK,
};
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