zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/pstore/Kconfig b/ap/os/linux/linux-3.4.x/fs/pstore/Kconfig
new file mode 100644
index 0000000..8007ae7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/pstore/Kconfig
@@ -0,0 +1,13 @@
+config PSTORE
+ bool "Persistent store support"
+ default n
+ help
+ This option enables generic access to platform level
+ persistent storage via "pstore" filesystem that can
+ be mounted as /dev/pstore. Only useful if you have
+ a platform level driver that registers with pstore to
+ provide the data, so you probably should just go say "Y"
+ (or "M") to a platform specific persistent store driver
+ (e.g. ACPI_APEI on X86) which will select this for you.
+ If you don't have a platform persistent store driver,
+ say N.
diff --git a/ap/os/linux/linux-3.4.x/fs/pstore/Makefile b/ap/os/linux/linux-3.4.x/fs/pstore/Makefile
new file mode 100644
index 0000000..760f4bc
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/pstore/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux pstorefs routines.
+#
+
+obj-y += pstore.o
+
+pstore-objs += inode.o platform.o
diff --git a/ap/os/linux/linux-3.4.x/fs/pstore/inode.c b/ap/os/linux/linux-3.4.x/fs/pstore/inode.c
new file mode 100644
index 0000000..1950788
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/pstore/inode.c
@@ -0,0 +1,319 @@
+/*
+ * Persistent Storage - ramfs parts.
+ *
+ * Copyright (C) 2010 Intel Corporation <tony.luck@intel.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/mount.h>
+#include <linux/ramfs.h>
+#include <linux/parser.h>
+#include <linux/sched.h>
+#include <linux/magic.h>
+#include <linux/pstore.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+#include "internal.h"
+
+#define PSTORE_NAMELEN 64
+
+static DEFINE_SPINLOCK(allpstore_lock);
+static LIST_HEAD(allpstore);
+
+struct pstore_private {
+ struct list_head list;
+ struct pstore_info *psi;
+ enum pstore_type_id type;
+ u64 id;
+ ssize_t size;
+ char data[];
+};
+
+static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct pstore_private *ps = file->private_data;
+
+ return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
+}
+
+static const struct file_operations pstore_file_operations = {
+ .open = simple_open,
+ .read = pstore_file_read,
+ .llseek = default_llseek,
+};
+
+/*
+ * When a file is unlinked from our file system we call the
+ * platform driver to erase the record from persistent store.
+ */
+static int pstore_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct pstore_private *p = dentry->d_inode->i_private;
+
+ if (p->psi->erase)
+ p->psi->erase(p->type, p->id, p->psi);
+
+ return simple_unlink(dir, dentry);
+}
+
+static void pstore_evict_inode(struct inode *inode)
+{
+ struct pstore_private *p = inode->i_private;
+ unsigned long flags;
+
+ end_writeback(inode);
+ if (p) {
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_del(&p->list);
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+ kfree(p);
+ }
+}
+
+static const struct inode_operations pstore_dir_inode_operations = {
+ .lookup = simple_lookup,
+ .unlink = pstore_unlink,
+};
+
+static struct inode *pstore_get_inode(struct super_block *sb)
+{
+ struct inode *inode = new_inode(sb);
+ if (inode) {
+ inode->i_ino = get_next_ino();
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ }
+ return inode;
+}
+
+enum {
+ Opt_kmsg_bytes, Opt_err
+};
+
+static const match_table_t tokens = {
+ {Opt_kmsg_bytes, "kmsg_bytes=%u"},
+ {Opt_err, NULL}
+};
+
+static void parse_options(char *options)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+
+ if (!options)
+ return;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_kmsg_bytes:
+ if (!match_int(&args[0], &option))
+ pstore_set_kmsg_bytes(option);
+ break;
+ }
+ }
+}
+
+static int pstore_remount(struct super_block *sb, int *flags, char *data)
+{
+ parse_options(data);
+
+ return 0;
+}
+
+static const struct super_operations pstore_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .evict_inode = pstore_evict_inode,
+ .remount_fs = pstore_remount,
+ .show_options = generic_show_options,
+};
+
+static struct super_block *pstore_sb;
+
+int pstore_is_mounted(void)
+{
+ return pstore_sb != NULL;
+}
+
+/*
+ * Make a regular file in the root directory of our file system.
+ * Load it up with "size" bytes of data from "buf".
+ * Set the mtime & ctime to the date that this record was originally stored.
+ */
+int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
+ char *data, size_t size, struct timespec time,
+ struct pstore_info *psi)
+{
+ struct dentry *root = pstore_sb->s_root;
+ struct dentry *dentry;
+ struct inode *inode;
+ int rc = 0;
+ char name[PSTORE_NAMELEN];
+ struct pstore_private *private, *pos;
+ unsigned long flags;
+
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_for_each_entry(pos, &allpstore, list) {
+ if (pos->type == type &&
+ pos->id == id &&
+ pos->psi == psi) {
+ rc = -EEXIST;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+ if (rc)
+ return rc;
+
+ rc = -ENOMEM;
+ inode = pstore_get_inode(pstore_sb);
+ if (!inode)
+ goto fail;
+ inode->i_mode = S_IFREG | 0444;
+ inode->i_fop = &pstore_file_operations;
+ private = kmalloc(sizeof *private + size, GFP_KERNEL);
+ if (!private)
+ goto fail_alloc;
+ private->type = type;
+ private->id = id;
+ private->psi = psi;
+
+ switch (type) {
+ case PSTORE_TYPE_DMESG:
+ sprintf(name, "dmesg-%s-%lld", psname, id);
+ break;
+ case PSTORE_TYPE_MCE:
+ sprintf(name, "mce-%s-%lld", psname, id);
+ break;
+ case PSTORE_TYPE_UNKNOWN:
+ sprintf(name, "unknown-%s-%lld", psname, id);
+ break;
+ default:
+ sprintf(name, "type%d-%s-%lld", type, psname, id);
+ break;
+ }
+
+ mutex_lock(&root->d_inode->i_mutex);
+
+ rc = -ENOSPC;
+ dentry = d_alloc_name(root, name);
+ if (IS_ERR(dentry))
+ goto fail_lockedalloc;
+
+ memcpy(private->data, data, size);
+ inode->i_size = private->size = size;
+
+ inode->i_private = private;
+
+ if (time.tv_sec)
+ inode->i_mtime = inode->i_ctime = time;
+
+ d_add(dentry, inode);
+
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_add(&private->list, &allpstore);
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+
+ mutex_unlock(&root->d_inode->i_mutex);
+
+ return 0;
+
+fail_lockedalloc:
+ mutex_unlock(&root->d_inode->i_mutex);
+ kfree(private);
+fail_alloc:
+ iput(inode);
+
+fail:
+ return rc;
+}
+
+int pstore_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *inode;
+
+ save_mount_options(sb, data);
+
+ pstore_sb = sb;
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = PSTOREFS_MAGIC;
+ sb->s_op = &pstore_ops;
+ sb->s_time_gran = 1;
+
+ parse_options(data);
+
+ inode = pstore_get_inode(sb);
+ if (inode) {
+ inode->i_mode = S_IFDIR | 0755;
+ inode->i_op = &pstore_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ inc_nlink(inode);
+ }
+ sb->s_root = d_make_root(inode);
+ if (!sb->s_root)
+ return -ENOMEM;
+
+ pstore_get_records(0);
+
+ return 0;
+}
+
+static struct dentry *pstore_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_single(fs_type, flags, data, pstore_fill_super);
+}
+
+static void pstore_kill_sb(struct super_block *sb)
+{
+ kill_litter_super(sb);
+ pstore_sb = NULL;
+}
+
+static struct file_system_type pstore_fs_type = {
+ .name = "pstore",
+ .mount = pstore_mount,
+ .kill_sb = pstore_kill_sb,
+};
+
+static int __init init_pstore_fs(void)
+{
+ return register_filesystem(&pstore_fs_type);
+}
+module_init(init_pstore_fs)
+
+MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
+MODULE_LICENSE("GPL");
diff --git a/ap/os/linux/linux-3.4.x/fs/pstore/internal.h b/ap/os/linux/linux-3.4.x/fs/pstore/internal.h
new file mode 100644
index 0000000..3bde461
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/pstore/internal.h
@@ -0,0 +1,6 @@
+extern void pstore_set_kmsg_bytes(int);
+extern void pstore_get_records(int);
+extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
+ char *data, size_t size,
+ struct timespec time, struct pstore_info *psi);
+extern int pstore_is_mounted(void);
diff --git a/ap/os/linux/linux-3.4.x/fs/pstore/platform.c b/ap/os/linux/linux-3.4.x/fs/pstore/platform.c
new file mode 100644
index 0000000..4a66a5c
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/pstore/platform.c
@@ -0,0 +1,284 @@
+/*
+ * Persistent Storage - platform driver interface parts.
+ *
+ * Copyright (C) 2010 Intel Corporation <tony.luck@intel.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/atomic.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kmsg_dump.h>
+#include <linux/module.h>
+#include <linux/pstore.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/hardirq.h>
+#include <linux/workqueue.h>
+
+#include "internal.h"
+
+/*
+ * We defer making "oops" entries appear in pstore - see
+ * whether the system is actually still running well enough
+ * to let someone see the entry
+ */
+#define PSTORE_INTERVAL (60 * HZ)
+
+static int pstore_new_entry;
+
+static void pstore_timefunc(unsigned long);
+static DEFINE_TIMER(pstore_timer, pstore_timefunc, 0, 0);
+
+static void pstore_dowork(struct work_struct *);
+static DECLARE_WORK(pstore_work, pstore_dowork);
+
+/*
+ * pstore_lock just protects "psinfo" during
+ * calls to pstore_register()
+ */
+static DEFINE_SPINLOCK(pstore_lock);
+static struct pstore_info *psinfo;
+
+static char *backend;
+
+/* How much of the console log to snapshot */
+static unsigned long kmsg_bytes = 10240;
+
+void pstore_set_kmsg_bytes(int bytes)
+{
+ kmsg_bytes = bytes;
+}
+
+/* Tag each group of saved records with a sequence number */
+static int oopscount;
+
+static const char *get_reason_str(enum kmsg_dump_reason reason)
+{
+ switch (reason) {
+ case KMSG_DUMP_PANIC:
+ return "Panic";
+ case KMSG_DUMP_OOPS:
+ return "Oops";
+ case KMSG_DUMP_EMERG:
+ return "Emergency";
+ case KMSG_DUMP_RESTART:
+ return "Restart";
+ case KMSG_DUMP_HALT:
+ return "Halt";
+ case KMSG_DUMP_POWEROFF:
+ return "Poweroff";
+ default:
+ return "Unknown";
+ }
+}
+
+bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
+{
+ /*
+ * In case of NMI path, pstore shouldn't be blocked
+ * regardless of reason.
+ */
+ if (in_nmi())
+ return true;
+
+ switch (reason) {
+ /* In panic case, other cpus are stopped by smp_send_stop(). */
+ case KMSG_DUMP_PANIC:
+ /* Emergency restart shouldn't be blocked by spin lock. */
+ case KMSG_DUMP_EMERG:
+ return true;
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL_GPL(pstore_cannot_block_path);
+
+/*
+ * callback from kmsg_dump. (s2,l2) has the most recently
+ * written bytes, older bytes are in (s1,l1). Save as much
+ * as we can from the end of the buffer.
+ */
+static void pstore_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;
+ unsigned long size, total = 0;
+ char *dst;
+ const char *why;
+ u64 id;
+ int hsize, ret;
+ unsigned int part = 1;
+ unsigned long flags = 0;
+ int is_locked = 0;
+
+ why = get_reason_str(reason);
+
+ if (pstore_cannot_block_path(reason)) {
+ is_locked = spin_trylock_irqsave(&psinfo->buf_lock, flags);
+ if (!is_locked) {
+ pr_err("pstore dump routine blocked in %s path, may corrupt error record\n"
+ , in_nmi() ? "NMI" : why);
+ }
+ } else
+ spin_lock_irqsave(&psinfo->buf_lock, flags);
+ oopscount++;
+ while (total < kmsg_bytes) {
+ dst = psinfo->buf;
+ hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
+ size = psinfo->bufsize - hsize;
+ dst += hsize;
+
+ l2_cpy = min(l2, size);
+ l1_cpy = min(l1, size - l2_cpy);
+
+ if (l1_cpy + l2_cpy == 0)
+ break;
+
+ s2_start = l2 - l2_cpy;
+ s1_start = l1 - l1_cpy;
+
+ memcpy(dst, s1 + s1_start, l1_cpy);
+ memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
+
+ ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
+ hsize + l1_cpy + l2_cpy, psinfo);
+ if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
+ pstore_new_entry = 1;
+ l1 -= l1_cpy;
+ l2 -= l2_cpy;
+ total += l1_cpy + l2_cpy;
+ part++;
+ }
+ if (pstore_cannot_block_path(reason)) {
+ if (is_locked)
+ spin_unlock_irqrestore(&psinfo->buf_lock, flags);
+ } else
+ spin_unlock_irqrestore(&psinfo->buf_lock, flags);
+}
+
+static struct kmsg_dumper pstore_dumper = {
+ .dump = pstore_dump,
+};
+
+/*
+ * platform specific persistent storage driver registers with
+ * us here. If pstore is already mounted, call the platform
+ * read function right away to populate the file system. If not
+ * then the pstore mount code will call us later to fill out
+ * the file system.
+ *
+ * Register with kmsg_dump to save last part of console log on panic.
+ */
+int pstore_register(struct pstore_info *psi)
+{
+ struct module *owner = psi->owner;
+
+ spin_lock(&pstore_lock);
+ if (psinfo) {
+ spin_unlock(&pstore_lock);
+ return -EBUSY;
+ }
+
+ if (backend && strcmp(backend, psi->name)) {
+ spin_unlock(&pstore_lock);
+ return -EINVAL;
+ }
+
+ psinfo = psi;
+ mutex_init(&psinfo->read_mutex);
+ spin_unlock(&pstore_lock);
+
+ if (owner && !try_module_get(owner)) {
+ psinfo = NULL;
+ return -EINVAL;
+ }
+
+ if (pstore_is_mounted())
+ pstore_get_records(0);
+
+ kmsg_dump_register(&pstore_dumper);
+
+ pstore_timer.expires = jiffies + PSTORE_INTERVAL;
+ add_timer(&pstore_timer);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pstore_register);
+
+/*
+ * Read all the records from the persistent store. Create
+ * files in our filesystem. Don't warn about -EEXIST errors
+ * when we are re-scanning the backing store looking to add new
+ * error records.
+ */
+void pstore_get_records(int quiet)
+{
+ struct pstore_info *psi = psinfo;
+ char *buf = NULL;
+ ssize_t size;
+ u64 id;
+ enum pstore_type_id type;
+ struct timespec time;
+ int failed = 0, rc;
+
+ if (!psi)
+ return;
+
+ mutex_lock(&psi->read_mutex);
+ if (psi->open && psi->open(psi))
+ goto out;
+
+ while ((size = psi->read(&id, &type, &time, &buf, psi)) > 0) {
+ rc = pstore_mkfile(type, psi->name, id, buf, (size_t)size,
+ time, psi);
+ kfree(buf);
+ buf = NULL;
+ if (rc && (rc != -EEXIST || !quiet))
+ failed++;
+ }
+ if (psi->close)
+ psi->close(psi);
+out:
+ mutex_unlock(&psi->read_mutex);
+
+ if (failed)
+ printk(KERN_WARNING "pstore: failed to load %d record(s) from '%s'\n",
+ failed, psi->name);
+}
+
+static void pstore_dowork(struct work_struct *work)
+{
+ pstore_get_records(1);
+}
+
+static void pstore_timefunc(unsigned long dummy)
+{
+ if (pstore_new_entry) {
+ pstore_new_entry = 0;
+ schedule_work(&pstore_work);
+ }
+
+ mod_timer(&pstore_timer, jiffies + PSTORE_INTERVAL);
+}
+
+module_param(backend, charp, 0444);
+MODULE_PARM_DESC(backend, "Pstore backend to use");