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242 lines
6.1 KiB
Diff
242 lines
6.1 KiB
Diff
--- /dev/null
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+++ b/include/linux/crashlog.h
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@@ -0,0 +1,12 @@
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+#ifndef __CRASHLOG_H
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+#define __CRASHLOG_H
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+
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+#ifdef CONFIG_CRASHLOG
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+void __init crashlog_init_mem(struct bootmem_data *bdata);
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+#else
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+static inline void crashlog_init_mem(struct bootmem_data *bdata)
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+{
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+}
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+#endif
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+
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+#endif
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -688,6 +688,9 @@ config NET_NS
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Allow user space to create what appear to be multiple instances
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of the network stack.
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+config CRASHLOG
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+ bool "Crash logging"
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+
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config BLK_DEV_INITRD
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bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
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depends on BROKEN || !FRV
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--- a/kernel/Makefile
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+++ b/kernel/Makefile
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@@ -96,6 +96,7 @@ obj-$(CONFIG_SMP) += sched_cpupri.o
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obj-$(CONFIG_SLOW_WORK) += slow-work.o
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obj-$(CONFIG_SLOW_WORK_DEBUG) += slow-work-debugfs.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o
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+obj-$(CONFIG_CRASHLOG) += crashlog.o
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ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
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# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
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--- /dev/null
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+++ b/kernel/crashlog.c
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@@ -0,0 +1,171 @@
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+/*
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+ * Crash information logger
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+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * Based on ramoops.c
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+ * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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+ * 02110-1301 USA
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/bootmem.h>
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+#include <linux/debugfs.h>
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+#include <linux/crashlog.h>
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+#include <linux/kmsg_dump.h>
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+#include <linux/module.h>
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+#include <linux/pfn.h>
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+#include <asm/io.h>
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+
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+#define CRASHLOG_PAGES 4
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+#define CRASHLOG_SIZE (CRASHLOG_PAGES * PAGE_SIZE)
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+#define CRASHLOG_MAGIC 0xa1eedead
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+
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+/*
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+ * Start the log at 1M before the end of RAM, as some boot loaders like
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+ * to use the end of the RAM for stack usage and other things
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+ * If this fails, fall back to using the last part.
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+ */
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+#define CRASHLOG_OFFSET (1024 * 1024)
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+
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+struct crashlog_data {
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+ u32 magic;
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+ u32 len;
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+ u8 data[];
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+};
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+
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+static struct debugfs_blob_wrapper crashlog_blob;
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+static unsigned long crashlog_addr = 0;
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+static struct crashlog_data *crashlog_buf;
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+static struct kmsg_dumper dump;
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+static bool first = true;
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+
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+extern struct list_head *crashlog_modules;
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+
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+void __init crashlog_init_mem(bootmem_data_t *bdata)
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+{
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+ unsigned long addr;
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+
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+ if (crashlog_addr)
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+ return;
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+
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+ addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
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+ if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
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+ printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
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+ bdata->node_low_pfn -= CRASHLOG_PAGES;
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+ addr = PFN_PHYS(bdata->node_low_pfn);
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+ }
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+ crashlog_addr = addr;
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+}
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+
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+static void __init crashlog_copy(void)
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+{
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+ if (crashlog_buf->magic != CRASHLOG_MAGIC)
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+ return;
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+
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+ if (!crashlog_buf->len || crashlog_buf->len >
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+ CRASHLOG_SIZE - sizeof(*crashlog_buf))
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+ return;
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+
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+ crashlog_blob.size = crashlog_buf->len;
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+ crashlog_blob.data = kmemdup(crashlog_buf->data,
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+ crashlog_buf->len, GFP_KERNEL);
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+
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+ debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
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+}
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+
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+static int get_maxlen(void)
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+{
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+ return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
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+}
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+
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+static void crashlog_printf(const char *fmt, ...)
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+{
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+ va_list args;
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+ int len = get_maxlen();
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+
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+ if (!len)
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+ return;
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+
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+ va_start(args, fmt);
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+ crashlog_buf->len += vsnprintf(
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+ &crashlog_buf->data[crashlog_buf->len],
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+ len, fmt, args);
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+ va_end(args);
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+}
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+
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+static void crashlog_do_dump(struct kmsg_dumper *dumper,
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+ enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
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+ const char *s2, unsigned long l2)
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+{
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+ unsigned long s1_start, s2_start;
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+ unsigned long l1_cpy, l2_cpy;
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+ struct timeval tv;
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+ struct module *m;
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+ char *buf;
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+ int len;
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+
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+ if (!first)
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+ crashlog_printf("\n===================================\n");
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+
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+ do_gettimeofday(&tv);
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+ crashlog_printf("Time: %lu.%lu\n",
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+ (long)tv.tv_sec, (long)tv.tv_usec);
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+
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+ if (first) {
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+ crashlog_printf("Modules:");
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+ list_for_each_entry(m, crashlog_modules, list) {
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+ crashlog_printf("\t%s@%p+%x", m->name,
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+ m->module_core, m->core_size,
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+ m->module_init, m->init_size);
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+ }
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+ crashlog_printf("\n");
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+ first = false;
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+ }
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+
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+ buf = (char *)&crashlog_buf->data[crashlog_buf->len];
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+ len = get_maxlen();
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+
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+ l2_cpy = min(l2, (unsigned long)len);
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+ l1_cpy = min(l1, (unsigned long)len - l2_cpy);
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+
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+ s2_start = l2 - l2_cpy;
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+ s1_start = l1 - l1_cpy;
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+
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+ memcpy(buf, s1 + s1_start, l1_cpy);
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+ memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy);
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+ crashlog_buf->len += l1_cpy + l2_cpy;
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+}
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+
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+
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+int __init crashlog_init_fs(void)
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+{
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+ if (!crashlog_addr)
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+ return -ENOMEM;
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+
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+ crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
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+
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+ crashlog_copy();
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+
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+ crashlog_buf->magic = CRASHLOG_MAGIC;
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+ crashlog_buf->len = 0;
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+
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+ dump.dump = crashlog_do_dump;
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+ kmsg_dump_register(&dump);
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+
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+ return 0;
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+}
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+module_init(crashlog_init_fs);
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--- a/mm/bootmem.c
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+++ b/mm/bootmem.c
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@@ -13,6 +13,7 @@
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <linux/kmemleak.h>
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+#include <linux/crashlog.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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@@ -152,6 +153,7 @@ static unsigned long __init free_all_boo
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if (!bdata->node_bootmem_map)
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return 0;
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+ crashlog_init_mem(bdata);
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start = bdata->node_min_pfn;
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end = bdata->node_low_pfn;
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--- a/kernel/module.c
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+++ b/kernel/module.c
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@@ -79,6 +79,9 @@ EXPORT_TRACEPOINT_SYMBOL(module_get);
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DEFINE_MUTEX(module_mutex);
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EXPORT_SYMBOL_GPL(module_mutex);
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static LIST_HEAD(modules);
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+#ifdef CONFIG_CRASHLOG
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+struct list_head *crashlog_modules = &modules;
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+#endif
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/* Block module loading/unloading? */
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int modules_disabled = 0;
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