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-rw-r--r--target/linux/generic/patches-2.6.34/930-crashlog.patch241
1 files changed, 241 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.34/930-crashlog.patch b/target/linux/generic/patches-2.6.34/930-crashlog.patch
new file mode 100644
index 0000000000..ab6f542714
--- /dev/null
+++ b/target/linux/generic/patches-2.6.34/930-crashlog.patch
@@ -0,0 +1,241 @@
+--- /dev/null
++++ b/include/linux/crashlog.h
+@@ -0,0 +1,12 @@
++#ifndef __CRASHLOG_H
++#define __CRASHLOG_H
++
++#ifdef CONFIG_CRASHLOG
++void __init crashlog_init_mem(struct bootmem_data *bdata);
++#else
++static inline void crashlog_init_mem(struct bootmem_data *bdata)
++{
++}
++#endif
++
++#endif
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -715,6 +715,9 @@ config NET_NS
+ Allow user space to create what appear to be multiple instances
+ of the network stack.
+
++config CRASHLOG
++ bool "Crash logging"
++
+ config BLK_DEV_INITRD
+ bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
+ depends on BROKEN || !FRV
+--- a/kernel/Makefile
++++ b/kernel/Makefile
+@@ -105,6 +105,7 @@ obj-$(CONFIG_PERF_EVENTS) += perf_event.
+ obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
+ obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
+ obj-$(CONFIG_PADATA) += padata.o
++obj-$(CONFIG_CRASHLOG) += crashlog.o
+
+ ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
+ # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
+--- /dev/null
++++ b/kernel/crashlog.c
+@@ -0,0 +1,171 @@
++/*
++ * Crash information logger
++ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
++ *
++ * Based on ramoops.c
++ * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * version 2 as published by the Free Software Foundation.
++ *
++ * 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.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ *
++ */
++
++#include <linux/module.h>
++#include <linux/bootmem.h>
++#include <linux/debugfs.h>
++#include <linux/crashlog.h>
++#include <linux/kmsg_dump.h>
++#include <linux/module.h>
++#include <linux/pfn.h>
++#include <asm/io.h>
++
++#define CRASHLOG_PAGES 4
++#define CRASHLOG_SIZE (CRASHLOG_PAGES * PAGE_SIZE)
++#define CRASHLOG_MAGIC 0xa1eedead
++
++/*
++ * Start the log at 1M before the end of RAM, as some boot loaders like
++ * to use the end of the RAM for stack usage and other things
++ * If this fails, fall back to using the last part.
++ */
++#define CRASHLOG_OFFSET (1024 * 1024)
++
++struct crashlog_data {
++ u32 magic;
++ u32 len;
++ u8 data[];
++};
++
++static struct debugfs_blob_wrapper crashlog_blob;
++static unsigned long crashlog_addr = 0;
++static struct crashlog_data *crashlog_buf;
++static struct kmsg_dumper dump;
++static bool first = true;
++
++extern struct list_head *crashlog_modules;
++
++void __init crashlog_init_mem(bootmem_data_t *bdata)
++{
++ unsigned long addr;
++
++ if (crashlog_addr)
++ return;
++
++ addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
++ if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
++ printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
++ bdata->node_low_pfn -= CRASHLOG_PAGES;
++ addr = PFN_PHYS(bdata->node_low_pfn);
++ }
++ crashlog_addr = addr;
++}
++
++static void __init crashlog_copy(void)
++{
++ if (crashlog_buf->magic != CRASHLOG_MAGIC)
++ return;
++
++ if (!crashlog_buf->len || crashlog_buf->len >
++ CRASHLOG_SIZE - sizeof(*crashlog_buf))
++ return;
++
++ crashlog_blob.size = crashlog_buf->len;
++ crashlog_blob.data = kmemdup(crashlog_buf->data,
++ crashlog_buf->len, GFP_KERNEL);
++
++ debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
++}
++
++static int get_maxlen(void)
++{
++ return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
++}
++
++static void crashlog_printf(const char *fmt, ...)
++{
++ va_list args;
++ int len = get_maxlen();
++
++ if (!len)
++ return;
++
++ va_start(args, fmt);
++ crashlog_buf->len += vsnprintf(
++ &crashlog_buf->data[crashlog_buf->len],
++ len, fmt, args);
++ va_end(args);
++}
++
++static void crashlog_do_dump(struct kmsg_dumper *dumper,
++ enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
++ const char *s2, unsigned long l2)
++{
++ unsigned long s1_start, s2_start;
++ unsigned long l1_cpy, l2_cpy;
++ struct timeval tv;
++ struct module *m;
++ char *buf;
++ int len;
++
++ if (!first)
++ crashlog_printf("\n===================================\n");
++
++ do_gettimeofday(&tv);
++ crashlog_printf("Time: %lu.%lu\n",
++ (long)tv.tv_sec, (long)tv.tv_usec);
++
++ if (first) {
++ crashlog_printf("Modules:");
++ list_for_each_entry(m, crashlog_modules, list) {
++ crashlog_printf("\t%s@%p+%x", m->name,
++ m->module_core, m->core_size,
++ m->module_init, m->init_size);
++ }
++ crashlog_printf("\n");
++ first = false;
++ }
++
++ buf = (char *)&crashlog_buf->data[crashlog_buf->len];
++ len = get_maxlen();
++
++ l2_cpy = min(l2, (unsigned long)len);
++ l1_cpy = min(l1, (unsigned long)len - l2_cpy);
++
++ s2_start = l2 - l2_cpy;
++ s1_start = l1 - l1_cpy;
++
++ memcpy(buf, s1 + s1_start, l1_cpy);
++ memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy);
++ crashlog_buf->len += l1_cpy + l2_cpy;
++}
++
++
++int __init crashlog_init_fs(void)
++{
++ if (!crashlog_addr)
++ return -ENOMEM;
++
++ crashlog_buf = ioremap(crashlog_addr, CRASHLOG_SIZE);
++
++ crashlog_copy();
++
++ crashlog_buf->magic = CRASHLOG_MAGIC;
++ crashlog_buf->len = 0;
++
++ dump.dump = crashlog_do_dump;
++ kmsg_dump_register(&dump);
++
++ return 0;
++}
++module_init(crashlog_init_fs);
+--- a/mm/bootmem.c
++++ b/mm/bootmem.c
+@@ -15,6 +15,7 @@
+ #include <linux/module.h>
+ #include <linux/kmemleak.h>
+ #include <linux/range.h>
++#include <linux/crashlog.h>
+
+ #include <asm/bug.h>
+ #include <asm/io.h>
+@@ -226,6 +227,7 @@ static unsigned long __init free_all_boo
+ if (!bdata->node_bootmem_map)
+ return 0;
+
++ crashlog_init_mem(bdata);
+ start = bdata->node_min_pfn;
+ end = bdata->node_low_pfn;
+
+--- a/kernel/module.c
++++ b/kernel/module.c
+@@ -79,6 +79,9 @@ EXPORT_TRACEPOINT_SYMBOL(module_get);
+ DEFINE_MUTEX(module_mutex);
+ EXPORT_SYMBOL_GPL(module_mutex);
+ static LIST_HEAD(modules);
++#ifdef CONFIG_CRASHLOG
++struct list_head *crashlog_modules = &modules;
++#endif
+
+ /* Block module loading/unloading? */
+ int modules_disabled = 0;