treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / target / linux / generic / patches-4.1 / 930-crashlog.patch
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--- /dev/null
+++ b/include/linux/crashlog.h
@@ -0,0 +1,17 @@
+#ifndef __CRASHLOG_H
+#define __CRASHLOG_H
+
+#ifdef CONFIG_CRASHLOG
+void crashlog_init_bootmem(struct bootmem_data *bdata);
+void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size);
+#else
+static inline void crashlog_init_bootmem(struct bootmem_data *bdata)
+{
+}
+
+static inline void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
+{
+}
+#endif
+
+#endif
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1275,6 +1275,10 @@ config RELAY
 
          If unsure, say N.
 
+config CRASHLOG
+       bool "Crash logging"
+       depends on (!NO_BOOTMEM || HAVE_MEMBLOCK) && !(ARM || SPARC || PPC)
+
 config BLK_DEV_INITRD
        bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
        depends on BROKEN || !FRV
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -98,6 +98,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
 obj-$(CONFIG_JUMP_LABEL) += jump_label.o
 obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
 obj-$(CONFIG_TORTURE_TEST) += torture.o
+obj-$(CONFIG_CRASHLOG) += crashlog.o
 
 $(obj)/configs.o: $(obj)/config_data.h
 
--- /dev/null
+++ b/kernel/crashlog.c
@@ -0,0 +1,181 @@
+/*
+ * Crash information logger
+ * Copyright (C) 2010 Felix Fietkau <nbd@nbd.name>
+ *
+ * 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/memblock.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;
+
+#ifndef CONFIG_NO_BOOTMEM
+void __init crashlog_init_bootmem(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;
+}
+#endif
+
+#ifdef CONFIG_HAVE_MEMBLOCK
+void __init_memblock crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
+{
+       if (crashlog_addr)
+               return;
+
+       addr += size - CRASHLOG_OFFSET;
+       if (memblock_reserve(addr, CRASHLOG_SIZE)) {
+               printk("Crashlog failed to allocate RAM at address 0x%lx\n", (unsigned long) addr);
+               return;
+       }
+
+       crashlog_addr = addr;
+}
+#endif
+
+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 += vscnprintf(
+               &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)
+{
+       struct timeval tv;
+       struct module *m;
+       char *buf;
+       size_t 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];
+
+       kmsg_dump_get_buffer(dumper, true, buf, get_maxlen(), &len);
+
+       crashlog_buf->len += len;
+}
+
+
+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.max_reason = KMSG_DUMP_OOPS;
+       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/export.h>
 #include <linux/kmemleak.h>
 #include <linux/range.h>
+#include <linux/crashlog.h>
 #include <linux/memblock.h>
 #include <linux/bug.h>
 #include <linux/io.h>
@@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
        if (!bdata->node_bootmem_map)
                return 0;
 
+       crashlog_init_bootmem(bdata);
        map = bdata->node_bootmem_map;
        start = bdata->node_min_pfn;
        end = bdata->node_low_pfn;
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -104,6 +104,9 @@ static LIST_HEAD(modules);
 #ifdef CONFIG_KGDB_KDB
 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
 #endif /* CONFIG_KGDB_KDB */
+#ifdef CONFIG_CRASHLOG
+struct list_head *crashlog_modules = &modules;
+#endif
 
 #ifdef CONFIG_MODULE_SIG
 #ifdef CONFIG_MODULE_SIG_FORCE
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -19,6 +19,7 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/memblock.h>
+#include <linux/crashlog.h>
 
 #include <asm-generic/sections.h>
 #include <linux/io.h>
@@ -477,6 +478,8 @@ static void __init_memblock memblock_ins
        memblock_set_region_node(rgn, nid);
        type->cnt++;
        type->total_size += size;
+       if (type == &memblock.memory && idx == 0)
+               crashlog_init_memblock(base, size);
 }
 
 /**
 
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