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2c09d1443b
The info->read() function returns ssize_t. That means that info->read() either returns either negative error codes or a positive number representing the bytes read. The "rcnt" variable should be declared as ssize_t as well. Most places do this correctly but psz_kmsg_recover_meta() needed to be fixed. This code casts the "rcnt" to int. That is unnecessary when "rcnt" is already signed. It's also slightly wrong because if info->read() returned a very high (more than INT_MAX) number of bytes then this might treat that as an error. This bug cannot happen in real life, so it doesn't affect run time, but static checkers correctly complain that it is wrong. fs/pstore/zone.c:366 psz_kmsg_recover_data() warn: casting 'rcnt' truncates high bits Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/YrRtPSFHDVJzV6d+@kili
1469 lines
35 KiB
C
1469 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Provide a pstore intermediate backend, organized into kernel memory
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* allocated zones that are then mapped and flushed into a single
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* contiguous region on a storage backend of some kind (block, mtd, etc).
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include <linux/printk.h>
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#include <linux/fs.h>
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#include <linux/pstore_zone.h>
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#include <linux/kdev_t.h>
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#include <linux/device.h>
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#include <linux/namei.h>
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#include <linux/fcntl.h>
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#include <linux/uio.h>
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#include <linux/writeback.h>
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#include "internal.h"
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/**
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* struct psz_buffer - header of zone to flush to storage
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*
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* @sig: signature to indicate header (PSZ_SIG xor PSZONE-type value)
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* @datalen: length of data in @data
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* @start: offset into @data where the beginning of the stored bytes begin
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* @data: zone data.
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*/
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struct psz_buffer {
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#define PSZ_SIG (0x43474244) /* DBGC */
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uint32_t sig;
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atomic_t datalen;
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atomic_t start;
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uint8_t data[];
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};
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/**
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* struct psz_kmsg_header - kmsg dump-specific header to flush to storage
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*
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* @magic: magic num for kmsg dump header
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* @time: kmsg dump trigger time
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* @compressed: whether conpressed
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* @counter: kmsg dump counter
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* @reason: the kmsg dump reason (e.g. oops, panic, etc)
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* @data: pointer to log data
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*
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* This is a sub-header for a kmsg dump, trailing after &psz_buffer.
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*/
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struct psz_kmsg_header {
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#define PSTORE_KMSG_HEADER_MAGIC 0x4dfc3ae5 /* Just a random number */
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uint32_t magic;
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struct timespec64 time;
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bool compressed;
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uint32_t counter;
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enum kmsg_dump_reason reason;
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uint8_t data[];
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};
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/**
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* struct pstore_zone - single stored buffer
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*
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* @off: zone offset of storage
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* @type: front-end type for this zone
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* @name: front-end name for this zone
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* @buffer: pointer to data buffer managed by this zone
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* @oldbuf: pointer to old data buffer
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* @buffer_size: bytes in @buffer->data
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* @should_recover: whether this zone should recover from storage
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* @dirty: whether the data in @buffer dirty
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*
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* zone structure in memory.
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*/
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struct pstore_zone {
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loff_t off;
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const char *name;
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enum pstore_type_id type;
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struct psz_buffer *buffer;
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struct psz_buffer *oldbuf;
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size_t buffer_size;
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bool should_recover;
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atomic_t dirty;
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};
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/**
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* struct psz_context - all about running state of pstore/zone
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*
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* @kpszs: kmsg dump storage zones
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* @ppsz: pmsg storage zone
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* @cpsz: console storage zone
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* @fpszs: ftrace storage zones
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* @kmsg_max_cnt: max count of @kpszs
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* @kmsg_read_cnt: counter of total read kmsg dumps
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* @kmsg_write_cnt: counter of total kmsg dump writes
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* @pmsg_read_cnt: counter of total read pmsg zone
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* @console_read_cnt: counter of total read console zone
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* @ftrace_max_cnt: max count of @fpszs
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* @ftrace_read_cnt: counter of max read ftrace zone
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* @oops_counter: counter of oops dumps
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* @panic_counter: counter of panic dumps
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* @recovered: whether finished recovering data from storage
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* @on_panic: whether panic is happening
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* @pstore_zone_info_lock: lock to @pstore_zone_info
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* @pstore_zone_info: information from backend
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* @pstore: structure for pstore
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*/
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struct psz_context {
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struct pstore_zone **kpszs;
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struct pstore_zone *ppsz;
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struct pstore_zone *cpsz;
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struct pstore_zone **fpszs;
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unsigned int kmsg_max_cnt;
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unsigned int kmsg_read_cnt;
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unsigned int kmsg_write_cnt;
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unsigned int pmsg_read_cnt;
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unsigned int console_read_cnt;
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unsigned int ftrace_max_cnt;
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unsigned int ftrace_read_cnt;
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/*
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* These counters should be calculated during recovery.
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* It records the oops/panic times after crashes rather than boots.
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*/
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unsigned int oops_counter;
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unsigned int panic_counter;
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atomic_t recovered;
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atomic_t on_panic;
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/*
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* pstore_zone_info_lock protects this entire structure during calls
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* to register_pstore_zone()/unregister_pstore_zone().
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*/
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struct mutex pstore_zone_info_lock;
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struct pstore_zone_info *pstore_zone_info;
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struct pstore_info pstore;
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};
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static struct psz_context pstore_zone_cxt;
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static void psz_flush_all_dirty_zones(struct work_struct *);
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static DECLARE_DELAYED_WORK(psz_cleaner, psz_flush_all_dirty_zones);
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/**
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* enum psz_flush_mode - flush mode for psz_zone_write()
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*
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* @FLUSH_NONE: do not flush to storage but update data on memory
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* @FLUSH_PART: just flush part of data including meta data to storage
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* @FLUSH_META: just flush meta data of zone to storage
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* @FLUSH_ALL: flush all of zone
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*/
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enum psz_flush_mode {
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FLUSH_NONE = 0,
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FLUSH_PART,
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FLUSH_META,
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FLUSH_ALL,
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};
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static inline int buffer_datalen(struct pstore_zone *zone)
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{
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return atomic_read(&zone->buffer->datalen);
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}
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static inline int buffer_start(struct pstore_zone *zone)
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{
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return atomic_read(&zone->buffer->start);
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}
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static inline bool is_on_panic(void)
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{
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return atomic_read(&pstore_zone_cxt.on_panic);
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}
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static ssize_t psz_zone_read_buffer(struct pstore_zone *zone, char *buf,
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size_t len, unsigned long off)
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{
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if (!buf || !zone || !zone->buffer)
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return -EINVAL;
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if (off > zone->buffer_size)
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return -EINVAL;
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len = min_t(size_t, len, zone->buffer_size - off);
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memcpy(buf, zone->buffer->data + off, len);
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return len;
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}
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static int psz_zone_read_oldbuf(struct pstore_zone *zone, char *buf,
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size_t len, unsigned long off)
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{
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if (!buf || !zone || !zone->oldbuf)
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return -EINVAL;
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if (off > zone->buffer_size)
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return -EINVAL;
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len = min_t(size_t, len, zone->buffer_size - off);
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memcpy(buf, zone->oldbuf->data + off, len);
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return 0;
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}
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static int psz_zone_write(struct pstore_zone *zone,
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enum psz_flush_mode flush_mode, const char *buf,
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size_t len, unsigned long off)
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{
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struct pstore_zone_info *info = pstore_zone_cxt.pstore_zone_info;
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ssize_t wcnt = 0;
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ssize_t (*writeop)(const char *buf, size_t bytes, loff_t pos);
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size_t wlen;
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if (off > zone->buffer_size)
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return -EINVAL;
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wlen = min_t(size_t, len, zone->buffer_size - off);
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if (buf && wlen) {
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memcpy(zone->buffer->data + off, buf, wlen);
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atomic_set(&zone->buffer->datalen, wlen + off);
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}
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/* avoid to damage old records */
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if (!is_on_panic() && !atomic_read(&pstore_zone_cxt.recovered))
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goto dirty;
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writeop = is_on_panic() ? info->panic_write : info->write;
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if (!writeop)
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goto dirty;
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switch (flush_mode) {
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case FLUSH_NONE:
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if (unlikely(buf && wlen))
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goto dirty;
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return 0;
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case FLUSH_PART:
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wcnt = writeop((const char *)zone->buffer->data + off, wlen,
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zone->off + sizeof(*zone->buffer) + off);
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if (wcnt != wlen)
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goto dirty;
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fallthrough;
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case FLUSH_META:
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wlen = sizeof(struct psz_buffer);
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wcnt = writeop((const char *)zone->buffer, wlen, zone->off);
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if (wcnt != wlen)
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goto dirty;
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break;
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case FLUSH_ALL:
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wlen = zone->buffer_size + sizeof(*zone->buffer);
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wcnt = writeop((const char *)zone->buffer, wlen, zone->off);
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if (wcnt != wlen)
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goto dirty;
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break;
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}
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return 0;
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dirty:
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/* no need to mark dirty if going to try next zone */
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if (wcnt == -ENOMSG)
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return -ENOMSG;
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atomic_set(&zone->dirty, true);
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/* flush dirty zones nicely */
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if (wcnt == -EBUSY && !is_on_panic())
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schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(500));
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return -EBUSY;
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}
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static int psz_flush_dirty_zone(struct pstore_zone *zone)
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{
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int ret;
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if (unlikely(!zone))
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return -EINVAL;
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if (unlikely(!atomic_read(&pstore_zone_cxt.recovered)))
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return -EBUSY;
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if (!atomic_xchg(&zone->dirty, false))
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return 0;
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ret = psz_zone_write(zone, FLUSH_ALL, NULL, 0, 0);
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if (ret)
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atomic_set(&zone->dirty, true);
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return ret;
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}
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static int psz_flush_dirty_zones(struct pstore_zone **zones, unsigned int cnt)
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{
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int i, ret;
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struct pstore_zone *zone;
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if (!zones)
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return -EINVAL;
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for (i = 0; i < cnt; i++) {
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zone = zones[i];
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if (!zone)
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return -EINVAL;
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ret = psz_flush_dirty_zone(zone);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int psz_move_zone(struct pstore_zone *old, struct pstore_zone *new)
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{
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const char *data = (const char *)old->buffer->data;
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int ret;
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ret = psz_zone_write(new, FLUSH_ALL, data, buffer_datalen(old), 0);
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if (ret) {
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atomic_set(&new->buffer->datalen, 0);
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atomic_set(&new->dirty, false);
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return ret;
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}
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atomic_set(&old->buffer->datalen, 0);
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return 0;
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}
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static void psz_flush_all_dirty_zones(struct work_struct *work)
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{
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struct psz_context *cxt = &pstore_zone_cxt;
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int ret = 0;
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if (cxt->ppsz)
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ret |= psz_flush_dirty_zone(cxt->ppsz);
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if (cxt->cpsz)
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ret |= psz_flush_dirty_zone(cxt->cpsz);
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if (cxt->kpszs)
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ret |= psz_flush_dirty_zones(cxt->kpszs, cxt->kmsg_max_cnt);
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if (cxt->fpszs)
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ret |= psz_flush_dirty_zones(cxt->fpszs, cxt->ftrace_max_cnt);
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if (ret && cxt->pstore_zone_info)
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schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(1000));
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}
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static int psz_kmsg_recover_data(struct psz_context *cxt)
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{
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struct pstore_zone_info *info = cxt->pstore_zone_info;
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struct pstore_zone *zone = NULL;
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struct psz_buffer *buf;
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unsigned long i;
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ssize_t rcnt;
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if (!info->read)
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return -EINVAL;
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for (i = 0; i < cxt->kmsg_max_cnt; i++) {
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zone = cxt->kpszs[i];
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if (unlikely(!zone))
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return -EINVAL;
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if (atomic_read(&zone->dirty)) {
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unsigned int wcnt = cxt->kmsg_write_cnt;
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struct pstore_zone *new = cxt->kpszs[wcnt];
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int ret;
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ret = psz_move_zone(zone, new);
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if (ret) {
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pr_err("move zone from %lu to %d failed\n",
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i, wcnt);
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return ret;
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}
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cxt->kmsg_write_cnt = (wcnt + 1) % cxt->kmsg_max_cnt;
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}
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if (!zone->should_recover)
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continue;
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buf = zone->buffer;
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rcnt = info->read((char *)buf, zone->buffer_size + sizeof(*buf),
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zone->off);
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if (rcnt != zone->buffer_size + sizeof(*buf))
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return rcnt < 0 ? rcnt : -EIO;
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}
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return 0;
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}
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static int psz_kmsg_recover_meta(struct psz_context *cxt)
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{
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struct pstore_zone_info *info = cxt->pstore_zone_info;
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struct pstore_zone *zone;
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ssize_t rcnt, len;
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struct psz_buffer *buf;
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struct psz_kmsg_header *hdr;
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struct timespec64 time = { };
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unsigned long i;
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/*
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* Recover may on panic, we can't allocate any memory by kmalloc.
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* So, we use local array instead.
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*/
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char buffer_header[sizeof(*buf) + sizeof(*hdr)] = {0};
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if (!info->read)
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return -EINVAL;
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len = sizeof(*buf) + sizeof(*hdr);
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buf = (struct psz_buffer *)buffer_header;
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for (i = 0; i < cxt->kmsg_max_cnt; i++) {
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zone = cxt->kpszs[i];
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if (unlikely(!zone))
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return -EINVAL;
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rcnt = info->read((char *)buf, len, zone->off);
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if (rcnt == -ENOMSG) {
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pr_debug("%s with id %lu may be broken, skip\n",
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zone->name, i);
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continue;
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} else if (rcnt != len) {
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pr_err("read %s with id %lu failed\n", zone->name, i);
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return rcnt < 0 ? rcnt : -EIO;
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}
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if (buf->sig != zone->buffer->sig) {
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pr_debug("no valid data in kmsg dump zone %lu\n", i);
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continue;
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}
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if (zone->buffer_size < atomic_read(&buf->datalen)) {
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pr_info("found overtop zone: %s: id %lu, off %lld, size %zu\n",
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zone->name, i, zone->off,
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zone->buffer_size);
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continue;
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}
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hdr = (struct psz_kmsg_header *)buf->data;
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if (hdr->magic != PSTORE_KMSG_HEADER_MAGIC) {
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pr_info("found invalid zone: %s: id %lu, off %lld, size %zu\n",
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zone->name, i, zone->off,
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zone->buffer_size);
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continue;
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}
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|
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/*
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* we get the newest zone, and the next one must be the oldest
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* or unused zone, because we do write one by one like a circle.
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*/
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if (hdr->time.tv_sec >= time.tv_sec) {
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time.tv_sec = hdr->time.tv_sec;
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cxt->kmsg_write_cnt = (i + 1) % cxt->kmsg_max_cnt;
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}
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|
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if (hdr->reason == KMSG_DUMP_OOPS)
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cxt->oops_counter =
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max(cxt->oops_counter, hdr->counter);
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else if (hdr->reason == KMSG_DUMP_PANIC)
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cxt->panic_counter =
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max(cxt->panic_counter, hdr->counter);
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|
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if (!atomic_read(&buf->datalen)) {
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pr_debug("found erased zone: %s: id %lu, off %lld, size %zu, datalen %d\n",
|
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zone->name, i, zone->off,
|
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zone->buffer_size,
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atomic_read(&buf->datalen));
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continue;
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}
|
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|
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if (!is_on_panic())
|
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zone->should_recover = true;
|
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pr_debug("found nice zone: %s: id %lu, off %lld, size %zu, datalen %d\n",
|
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zone->name, i, zone->off,
|
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zone->buffer_size, atomic_read(&buf->datalen));
|
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}
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|
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return 0;
|
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}
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|
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static int psz_kmsg_recover(struct psz_context *cxt)
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{
|
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int ret;
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|
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if (!cxt->kpszs)
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return 0;
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|
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ret = psz_kmsg_recover_meta(cxt);
|
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if (ret)
|
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goto recover_fail;
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|
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ret = psz_kmsg_recover_data(cxt);
|
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if (ret)
|
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goto recover_fail;
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|
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return 0;
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recover_fail:
|
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pr_debug("psz_recover_kmsg failed\n");
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return ret;
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}
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|
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static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
|
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{
|
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struct pstore_zone_info *info = cxt->pstore_zone_info;
|
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struct psz_buffer *oldbuf, tmpbuf;
|
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int ret = 0;
|
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char *buf;
|
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ssize_t rcnt, len, start, off;
|
|
|
|
if (!zone || zone->oldbuf)
|
|
return 0;
|
|
|
|
if (is_on_panic()) {
|
|
/* save data as much as possible */
|
|
psz_flush_dirty_zone(zone);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(!info->read))
|
|
return -EINVAL;
|
|
|
|
len = sizeof(struct psz_buffer);
|
|
rcnt = info->read((char *)&tmpbuf, len, zone->off);
|
|
if (rcnt != len) {
|
|
pr_debug("read zone %s failed\n", zone->name);
|
|
return rcnt < 0 ? rcnt : -EIO;
|
|
}
|
|
|
|
if (tmpbuf.sig != zone->buffer->sig) {
|
|
pr_debug("no valid data in zone %s\n", zone->name);
|
|
return 0;
|
|
}
|
|
|
|
if (zone->buffer_size < atomic_read(&tmpbuf.datalen) ||
|
|
zone->buffer_size < atomic_read(&tmpbuf.start)) {
|
|
pr_info("found overtop zone: %s: off %lld, size %zu\n",
|
|
zone->name, zone->off, zone->buffer_size);
|
|
/* just keep going */
|
|
return 0;
|
|
}
|
|
|
|
if (!atomic_read(&tmpbuf.datalen)) {
|
|
pr_debug("found erased zone: %s: off %lld, size %zu, datalen %d\n",
|
|
zone->name, zone->off, zone->buffer_size,
|
|
atomic_read(&tmpbuf.datalen));
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("found nice zone: %s: off %lld, size %zu, datalen %d\n",
|
|
zone->name, zone->off, zone->buffer_size,
|
|
atomic_read(&tmpbuf.datalen));
|
|
|
|
len = atomic_read(&tmpbuf.datalen) + sizeof(*oldbuf);
|
|
oldbuf = kzalloc(len, GFP_KERNEL);
|
|
if (!oldbuf)
|
|
return -ENOMEM;
|
|
|
|
memcpy(oldbuf, &tmpbuf, sizeof(*oldbuf));
|
|
buf = (char *)oldbuf + sizeof(*oldbuf);
|
|
len = atomic_read(&oldbuf->datalen);
|
|
start = atomic_read(&oldbuf->start);
|
|
off = zone->off + sizeof(*oldbuf);
|
|
|
|
/* get part of data */
|
|
rcnt = info->read(buf, len - start, off + start);
|
|
if (rcnt != len - start) {
|
|
pr_err("read zone %s failed\n", zone->name);
|
|
ret = rcnt < 0 ? rcnt : -EIO;
|
|
goto free_oldbuf;
|
|
}
|
|
|
|
/* get the rest of data */
|
|
rcnt = info->read(buf + len - start, start, off);
|
|
if (rcnt != start) {
|
|
pr_err("read zone %s failed\n", zone->name);
|
|
ret = rcnt < 0 ? rcnt : -EIO;
|
|
goto free_oldbuf;
|
|
}
|
|
|
|
zone->oldbuf = oldbuf;
|
|
psz_flush_dirty_zone(zone);
|
|
return 0;
|
|
|
|
free_oldbuf:
|
|
kfree(oldbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int psz_recover_zones(struct psz_context *cxt,
|
|
struct pstore_zone **zones, unsigned int cnt)
|
|
{
|
|
int ret;
|
|
unsigned int i;
|
|
struct pstore_zone *zone;
|
|
|
|
if (!zones)
|
|
return 0;
|
|
|
|
for (i = 0; i < cnt; i++) {
|
|
zone = zones[i];
|
|
if (unlikely(!zone))
|
|
continue;
|
|
ret = psz_recover_zone(cxt, zone);
|
|
if (ret)
|
|
goto recover_fail;
|
|
}
|
|
|
|
return 0;
|
|
recover_fail:
|
|
pr_debug("recover %s[%u] failed\n", zone->name, i);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* psz_recovery() - recover data from storage
|
|
* @cxt: the context of pstore/zone
|
|
*
|
|
* recovery means reading data back from storage after rebooting
|
|
*
|
|
* Return: 0 on success, others on failure.
|
|
*/
|
|
static inline int psz_recovery(struct psz_context *cxt)
|
|
{
|
|
int ret;
|
|
|
|
if (atomic_read(&cxt->recovered))
|
|
return 0;
|
|
|
|
ret = psz_kmsg_recover(cxt);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = psz_recover_zone(cxt, cxt->ppsz);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = psz_recover_zone(cxt, cxt->cpsz);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = psz_recover_zones(cxt, cxt->fpszs, cxt->ftrace_max_cnt);
|
|
|
|
out:
|
|
if (unlikely(ret))
|
|
pr_err("recover failed\n");
|
|
else {
|
|
pr_debug("recover end!\n");
|
|
atomic_set(&cxt->recovered, 1);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int psz_pstore_open(struct pstore_info *psi)
|
|
{
|
|
struct psz_context *cxt = psi->data;
|
|
|
|
cxt->kmsg_read_cnt = 0;
|
|
cxt->pmsg_read_cnt = 0;
|
|
cxt->console_read_cnt = 0;
|
|
cxt->ftrace_read_cnt = 0;
|
|
return 0;
|
|
}
|
|
|
|
static inline bool psz_old_ok(struct pstore_zone *zone)
|
|
{
|
|
if (zone && zone->oldbuf && atomic_read(&zone->oldbuf->datalen))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static inline bool psz_ok(struct pstore_zone *zone)
|
|
{
|
|
if (zone && zone->buffer && buffer_datalen(zone))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static inline int psz_kmsg_erase(struct psz_context *cxt,
|
|
struct pstore_zone *zone, struct pstore_record *record)
|
|
{
|
|
struct psz_buffer *buffer = zone->buffer;
|
|
struct psz_kmsg_header *hdr =
|
|
(struct psz_kmsg_header *)buffer->data;
|
|
size_t size;
|
|
|
|
if (unlikely(!psz_ok(zone)))
|
|
return 0;
|
|
|
|
/* this zone is already updated, no need to erase */
|
|
if (record->count != hdr->counter)
|
|
return 0;
|
|
|
|
size = buffer_datalen(zone) + sizeof(*zone->buffer);
|
|
atomic_set(&zone->buffer->datalen, 0);
|
|
if (cxt->pstore_zone_info->erase)
|
|
return cxt->pstore_zone_info->erase(size, zone->off);
|
|
else
|
|
return psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
|
|
}
|
|
|
|
static inline int psz_record_erase(struct psz_context *cxt,
|
|
struct pstore_zone *zone)
|
|
{
|
|
if (unlikely(!psz_old_ok(zone)))
|
|
return 0;
|
|
|
|
kfree(zone->oldbuf);
|
|
zone->oldbuf = NULL;
|
|
/*
|
|
* if there are new data in zone buffer, that means the old data
|
|
* are already invalid. It is no need to flush 0 (erase) to
|
|
* block device.
|
|
*/
|
|
if (!buffer_datalen(zone))
|
|
return psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
|
|
psz_flush_dirty_zone(zone);
|
|
return 0;
|
|
}
|
|
|
|
static int psz_pstore_erase(struct pstore_record *record)
|
|
{
|
|
struct psz_context *cxt = record->psi->data;
|
|
|
|
switch (record->type) {
|
|
case PSTORE_TYPE_DMESG:
|
|
if (record->id >= cxt->kmsg_max_cnt)
|
|
return -EINVAL;
|
|
return psz_kmsg_erase(cxt, cxt->kpszs[record->id], record);
|
|
case PSTORE_TYPE_PMSG:
|
|
return psz_record_erase(cxt, cxt->ppsz);
|
|
case PSTORE_TYPE_CONSOLE:
|
|
return psz_record_erase(cxt, cxt->cpsz);
|
|
case PSTORE_TYPE_FTRACE:
|
|
if (record->id >= cxt->ftrace_max_cnt)
|
|
return -EINVAL;
|
|
return psz_record_erase(cxt, cxt->fpszs[record->id]);
|
|
default: return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static void psz_write_kmsg_hdr(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
struct psz_context *cxt = record->psi->data;
|
|
struct psz_buffer *buffer = zone->buffer;
|
|
struct psz_kmsg_header *hdr =
|
|
(struct psz_kmsg_header *)buffer->data;
|
|
|
|
hdr->magic = PSTORE_KMSG_HEADER_MAGIC;
|
|
hdr->compressed = record->compressed;
|
|
hdr->time.tv_sec = record->time.tv_sec;
|
|
hdr->time.tv_nsec = record->time.tv_nsec;
|
|
hdr->reason = record->reason;
|
|
if (hdr->reason == KMSG_DUMP_OOPS)
|
|
hdr->counter = ++cxt->oops_counter;
|
|
else if (hdr->reason == KMSG_DUMP_PANIC)
|
|
hdr->counter = ++cxt->panic_counter;
|
|
else
|
|
hdr->counter = 0;
|
|
}
|
|
|
|
/*
|
|
* In case zone is broken, which may occur to MTD device, we try each zones,
|
|
* start at cxt->kmsg_write_cnt.
|
|
*/
|
|
static inline int notrace psz_kmsg_write_record(struct psz_context *cxt,
|
|
struct pstore_record *record)
|
|
{
|
|
size_t size, hlen;
|
|
struct pstore_zone *zone;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < cxt->kmsg_max_cnt; i++) {
|
|
unsigned int zonenum, len;
|
|
int ret;
|
|
|
|
zonenum = (cxt->kmsg_write_cnt + i) % cxt->kmsg_max_cnt;
|
|
zone = cxt->kpszs[zonenum];
|
|
if (unlikely(!zone))
|
|
return -ENOSPC;
|
|
|
|
/* avoid destroying old data, allocate a new one */
|
|
len = zone->buffer_size + sizeof(*zone->buffer);
|
|
zone->oldbuf = zone->buffer;
|
|
zone->buffer = kzalloc(len, GFP_KERNEL);
|
|
if (!zone->buffer) {
|
|
zone->buffer = zone->oldbuf;
|
|
return -ENOMEM;
|
|
}
|
|
zone->buffer->sig = zone->oldbuf->sig;
|
|
|
|
pr_debug("write %s to zone id %d\n", zone->name, zonenum);
|
|
psz_write_kmsg_hdr(zone, record);
|
|
hlen = sizeof(struct psz_kmsg_header);
|
|
size = min_t(size_t, record->size, zone->buffer_size - hlen);
|
|
ret = psz_zone_write(zone, FLUSH_ALL, record->buf, size, hlen);
|
|
if (likely(!ret || ret != -ENOMSG)) {
|
|
cxt->kmsg_write_cnt = zonenum + 1;
|
|
cxt->kmsg_write_cnt %= cxt->kmsg_max_cnt;
|
|
/* no need to try next zone, free last zone buffer */
|
|
kfree(zone->oldbuf);
|
|
zone->oldbuf = NULL;
|
|
return ret;
|
|
}
|
|
|
|
pr_debug("zone %u may be broken, try next dmesg zone\n",
|
|
zonenum);
|
|
kfree(zone->buffer);
|
|
zone->buffer = zone->oldbuf;
|
|
zone->oldbuf = NULL;
|
|
}
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int notrace psz_kmsg_write(struct psz_context *cxt,
|
|
struct pstore_record *record)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Explicitly only take the first part of any new crash.
|
|
* If our buffer is larger than kmsg_bytes, this can never happen,
|
|
* and if our buffer is smaller than kmsg_bytes, we don't want the
|
|
* report split across multiple records.
|
|
*/
|
|
if (record->part != 1)
|
|
return -ENOSPC;
|
|
|
|
if (!cxt->kpszs)
|
|
return -ENOSPC;
|
|
|
|
ret = psz_kmsg_write_record(cxt, record);
|
|
if (!ret && is_on_panic()) {
|
|
/* ensure all data are flushed to storage when panic */
|
|
pr_debug("try to flush other dirty zones\n");
|
|
psz_flush_all_dirty_zones(NULL);
|
|
}
|
|
|
|
/* always return 0 as we had handled it on buffer */
|
|
return 0;
|
|
}
|
|
|
|
static int notrace psz_record_write(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
size_t start, rem;
|
|
bool is_full_data = false;
|
|
char *buf;
|
|
int cnt;
|
|
|
|
if (!zone || !record)
|
|
return -ENOSPC;
|
|
|
|
if (atomic_read(&zone->buffer->datalen) >= zone->buffer_size)
|
|
is_full_data = true;
|
|
|
|
cnt = record->size;
|
|
buf = record->buf;
|
|
if (unlikely(cnt > zone->buffer_size)) {
|
|
buf += cnt - zone->buffer_size;
|
|
cnt = zone->buffer_size;
|
|
}
|
|
|
|
start = buffer_start(zone);
|
|
rem = zone->buffer_size - start;
|
|
if (unlikely(rem < cnt)) {
|
|
psz_zone_write(zone, FLUSH_PART, buf, rem, start);
|
|
buf += rem;
|
|
cnt -= rem;
|
|
start = 0;
|
|
is_full_data = true;
|
|
}
|
|
|
|
atomic_set(&zone->buffer->start, cnt + start);
|
|
psz_zone_write(zone, FLUSH_PART, buf, cnt, start);
|
|
|
|
/**
|
|
* psz_zone_write will set datalen as start + cnt.
|
|
* It work if actual data length lesser than buffer size.
|
|
* If data length greater than buffer size, pmsg will rewrite to
|
|
* beginning of zone, which make buffer->datalen wrongly.
|
|
* So we should reset datalen as buffer size once actual data length
|
|
* greater than buffer size.
|
|
*/
|
|
if (is_full_data) {
|
|
atomic_set(&zone->buffer->datalen, zone->buffer_size);
|
|
psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int notrace psz_pstore_write(struct pstore_record *record)
|
|
{
|
|
struct psz_context *cxt = record->psi->data;
|
|
|
|
if (record->type == PSTORE_TYPE_DMESG &&
|
|
record->reason == KMSG_DUMP_PANIC)
|
|
atomic_set(&cxt->on_panic, 1);
|
|
|
|
/*
|
|
* if on panic, do not write except panic records
|
|
* Fix case that panic_write prints log which wakes up console backend.
|
|
*/
|
|
if (is_on_panic() && record->type != PSTORE_TYPE_DMESG)
|
|
return -EBUSY;
|
|
|
|
switch (record->type) {
|
|
case PSTORE_TYPE_DMESG:
|
|
return psz_kmsg_write(cxt, record);
|
|
case PSTORE_TYPE_CONSOLE:
|
|
return psz_record_write(cxt->cpsz, record);
|
|
case PSTORE_TYPE_PMSG:
|
|
return psz_record_write(cxt->ppsz, record);
|
|
case PSTORE_TYPE_FTRACE: {
|
|
int zonenum = smp_processor_id();
|
|
|
|
if (!cxt->fpszs)
|
|
return -ENOSPC;
|
|
return psz_record_write(cxt->fpszs[zonenum], record);
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static struct pstore_zone *psz_read_next_zone(struct psz_context *cxt)
|
|
{
|
|
struct pstore_zone *zone = NULL;
|
|
|
|
while (cxt->kmsg_read_cnt < cxt->kmsg_max_cnt) {
|
|
zone = cxt->kpszs[cxt->kmsg_read_cnt++];
|
|
if (psz_ok(zone))
|
|
return zone;
|
|
}
|
|
|
|
if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
|
|
/*
|
|
* No need psz_old_ok(). Let psz_ftrace_read() do so for
|
|
* combination. psz_ftrace_read() should traverse over
|
|
* all zones in case of some zone without data.
|
|
*/
|
|
return cxt->fpszs[cxt->ftrace_read_cnt++];
|
|
|
|
if (cxt->pmsg_read_cnt == 0) {
|
|
cxt->pmsg_read_cnt++;
|
|
zone = cxt->ppsz;
|
|
if (psz_old_ok(zone))
|
|
return zone;
|
|
}
|
|
|
|
if (cxt->console_read_cnt == 0) {
|
|
cxt->console_read_cnt++;
|
|
zone = cxt->cpsz;
|
|
if (psz_old_ok(zone))
|
|
return zone;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int psz_kmsg_read_hdr(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
struct psz_buffer *buffer = zone->buffer;
|
|
struct psz_kmsg_header *hdr =
|
|
(struct psz_kmsg_header *)buffer->data;
|
|
|
|
if (hdr->magic != PSTORE_KMSG_HEADER_MAGIC)
|
|
return -EINVAL;
|
|
record->compressed = hdr->compressed;
|
|
record->time.tv_sec = hdr->time.tv_sec;
|
|
record->time.tv_nsec = hdr->time.tv_nsec;
|
|
record->reason = hdr->reason;
|
|
record->count = hdr->counter;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t psz_kmsg_read(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
ssize_t size, hlen = 0;
|
|
|
|
size = buffer_datalen(zone);
|
|
/* Clear and skip this kmsg dump record if it has no valid header */
|
|
if (psz_kmsg_read_hdr(zone, record)) {
|
|
atomic_set(&zone->buffer->datalen, 0);
|
|
atomic_set(&zone->dirty, 0);
|
|
return -ENOMSG;
|
|
}
|
|
size -= sizeof(struct psz_kmsg_header);
|
|
|
|
if (!record->compressed) {
|
|
char *buf = kasprintf(GFP_KERNEL, "%s: Total %d times\n",
|
|
kmsg_dump_reason_str(record->reason),
|
|
record->count);
|
|
hlen = strlen(buf);
|
|
record->buf = krealloc(buf, hlen + size, GFP_KERNEL);
|
|
if (!record->buf) {
|
|
kfree(buf);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
record->buf = kmalloc(size, GFP_KERNEL);
|
|
if (!record->buf)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
size = psz_zone_read_buffer(zone, record->buf + hlen, size,
|
|
sizeof(struct psz_kmsg_header));
|
|
if (unlikely(size < 0)) {
|
|
kfree(record->buf);
|
|
return -ENOMSG;
|
|
}
|
|
|
|
return size + hlen;
|
|
}
|
|
|
|
/* try to combine all ftrace zones */
|
|
static ssize_t psz_ftrace_read(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
struct psz_context *cxt;
|
|
struct psz_buffer *buf;
|
|
int ret;
|
|
|
|
if (!zone || !record)
|
|
return -ENOSPC;
|
|
|
|
if (!psz_old_ok(zone))
|
|
goto out;
|
|
|
|
buf = (struct psz_buffer *)zone->oldbuf;
|
|
if (!buf)
|
|
return -ENOMSG;
|
|
|
|
ret = pstore_ftrace_combine_log(&record->buf, &record->size,
|
|
(char *)buf->data, atomic_read(&buf->datalen));
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
out:
|
|
cxt = record->psi->data;
|
|
if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
|
|
/* then, read next ftrace zone */
|
|
return -ENOMSG;
|
|
record->id = 0;
|
|
return record->size ? record->size : -ENOMSG;
|
|
}
|
|
|
|
static ssize_t psz_record_read(struct pstore_zone *zone,
|
|
struct pstore_record *record)
|
|
{
|
|
size_t len;
|
|
struct psz_buffer *buf;
|
|
|
|
if (!zone || !record)
|
|
return -ENOSPC;
|
|
|
|
buf = (struct psz_buffer *)zone->oldbuf;
|
|
if (!buf)
|
|
return -ENOMSG;
|
|
|
|
len = atomic_read(&buf->datalen);
|
|
record->buf = kmalloc(len, GFP_KERNEL);
|
|
if (!record->buf)
|
|
return -ENOMEM;
|
|
|
|
if (unlikely(psz_zone_read_oldbuf(zone, record->buf, len, 0))) {
|
|
kfree(record->buf);
|
|
return -ENOMSG;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t psz_pstore_read(struct pstore_record *record)
|
|
{
|
|
struct psz_context *cxt = record->psi->data;
|
|
ssize_t (*readop)(struct pstore_zone *zone,
|
|
struct pstore_record *record);
|
|
struct pstore_zone *zone;
|
|
ssize_t ret;
|
|
|
|
/* before read, we must recover from storage */
|
|
ret = psz_recovery(cxt);
|
|
if (ret)
|
|
return ret;
|
|
|
|
next_zone:
|
|
zone = psz_read_next_zone(cxt);
|
|
if (!zone)
|
|
return 0;
|
|
|
|
record->type = zone->type;
|
|
switch (record->type) {
|
|
case PSTORE_TYPE_DMESG:
|
|
readop = psz_kmsg_read;
|
|
record->id = cxt->kmsg_read_cnt - 1;
|
|
break;
|
|
case PSTORE_TYPE_FTRACE:
|
|
readop = psz_ftrace_read;
|
|
break;
|
|
case PSTORE_TYPE_CONSOLE:
|
|
case PSTORE_TYPE_PMSG:
|
|
readop = psz_record_read;
|
|
break;
|
|
default:
|
|
goto next_zone;
|
|
}
|
|
|
|
ret = readop(zone, record);
|
|
if (ret == -ENOMSG)
|
|
goto next_zone;
|
|
return ret;
|
|
}
|
|
|
|
static struct psz_context pstore_zone_cxt = {
|
|
.pstore_zone_info_lock =
|
|
__MUTEX_INITIALIZER(pstore_zone_cxt.pstore_zone_info_lock),
|
|
.recovered = ATOMIC_INIT(0),
|
|
.on_panic = ATOMIC_INIT(0),
|
|
.pstore = {
|
|
.owner = THIS_MODULE,
|
|
.open = psz_pstore_open,
|
|
.read = psz_pstore_read,
|
|
.write = psz_pstore_write,
|
|
.erase = psz_pstore_erase,
|
|
},
|
|
};
|
|
|
|
static void psz_free_zone(struct pstore_zone **pszone)
|
|
{
|
|
struct pstore_zone *zone = *pszone;
|
|
|
|
if (!zone)
|
|
return;
|
|
|
|
kfree(zone->buffer);
|
|
kfree(zone);
|
|
*pszone = NULL;
|
|
}
|
|
|
|
static void psz_free_zones(struct pstore_zone ***pszones, unsigned int *cnt)
|
|
{
|
|
struct pstore_zone **zones = *pszones;
|
|
|
|
if (!zones)
|
|
return;
|
|
|
|
while (*cnt > 0) {
|
|
(*cnt)--;
|
|
psz_free_zone(&(zones[*cnt]));
|
|
}
|
|
kfree(zones);
|
|
*pszones = NULL;
|
|
}
|
|
|
|
static void psz_free_all_zones(struct psz_context *cxt)
|
|
{
|
|
if (cxt->kpszs)
|
|
psz_free_zones(&cxt->kpszs, &cxt->kmsg_max_cnt);
|
|
if (cxt->ppsz)
|
|
psz_free_zone(&cxt->ppsz);
|
|
if (cxt->cpsz)
|
|
psz_free_zone(&cxt->cpsz);
|
|
if (cxt->fpszs)
|
|
psz_free_zones(&cxt->fpszs, &cxt->ftrace_max_cnt);
|
|
}
|
|
|
|
static struct pstore_zone *psz_init_zone(enum pstore_type_id type,
|
|
loff_t *off, size_t size)
|
|
{
|
|
struct pstore_zone_info *info = pstore_zone_cxt.pstore_zone_info;
|
|
struct pstore_zone *zone;
|
|
const char *name = pstore_type_to_name(type);
|
|
|
|
if (!size)
|
|
return NULL;
|
|
|
|
if (*off + size > info->total_size) {
|
|
pr_err("no room for %s (0x%zx@0x%llx over 0x%lx)\n",
|
|
name, size, *off, info->total_size);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
zone = kzalloc(sizeof(struct pstore_zone), GFP_KERNEL);
|
|
if (!zone)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
zone->buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!zone->buffer) {
|
|
kfree(zone);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
memset(zone->buffer, 0xFF, size);
|
|
zone->off = *off;
|
|
zone->name = name;
|
|
zone->type = type;
|
|
zone->buffer_size = size - sizeof(struct psz_buffer);
|
|
zone->buffer->sig = type ^ PSZ_SIG;
|
|
zone->oldbuf = NULL;
|
|
atomic_set(&zone->dirty, 0);
|
|
atomic_set(&zone->buffer->datalen, 0);
|
|
atomic_set(&zone->buffer->start, 0);
|
|
|
|
*off += size;
|
|
|
|
pr_debug("pszone %s: off 0x%llx, %zu header, %zu data\n", zone->name,
|
|
zone->off, sizeof(*zone->buffer), zone->buffer_size);
|
|
return zone;
|
|
}
|
|
|
|
static struct pstore_zone **psz_init_zones(enum pstore_type_id type,
|
|
loff_t *off, size_t total_size, ssize_t record_size,
|
|
unsigned int *cnt)
|
|
{
|
|
struct pstore_zone_info *info = pstore_zone_cxt.pstore_zone_info;
|
|
struct pstore_zone **zones, *zone;
|
|
const char *name = pstore_type_to_name(type);
|
|
int c, i;
|
|
|
|
*cnt = 0;
|
|
if (!total_size || !record_size)
|
|
return NULL;
|
|
|
|
if (*off + total_size > info->total_size) {
|
|
pr_err("no room for zones %s (0x%zx@0x%llx over 0x%lx)\n",
|
|
name, total_size, *off, info->total_size);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
c = total_size / record_size;
|
|
zones = kcalloc(c, sizeof(*zones), GFP_KERNEL);
|
|
if (!zones) {
|
|
pr_err("allocate for zones %s failed\n", name);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
memset(zones, 0, c * sizeof(*zones));
|
|
|
|
for (i = 0; i < c; i++) {
|
|
zone = psz_init_zone(type, off, record_size);
|
|
if (!zone || IS_ERR(zone)) {
|
|
pr_err("initialize zones %s failed\n", name);
|
|
psz_free_zones(&zones, &i);
|
|
return (void *)zone;
|
|
}
|
|
zones[i] = zone;
|
|
}
|
|
|
|
*cnt = c;
|
|
return zones;
|
|
}
|
|
|
|
static int psz_alloc_zones(struct psz_context *cxt)
|
|
{
|
|
struct pstore_zone_info *info = cxt->pstore_zone_info;
|
|
loff_t off = 0;
|
|
int err;
|
|
size_t off_size = 0;
|
|
|
|
off_size += info->pmsg_size;
|
|
cxt->ppsz = psz_init_zone(PSTORE_TYPE_PMSG, &off, info->pmsg_size);
|
|
if (IS_ERR(cxt->ppsz)) {
|
|
err = PTR_ERR(cxt->ppsz);
|
|
cxt->ppsz = NULL;
|
|
goto free_out;
|
|
}
|
|
|
|
off_size += info->console_size;
|
|
cxt->cpsz = psz_init_zone(PSTORE_TYPE_CONSOLE, &off,
|
|
info->console_size);
|
|
if (IS_ERR(cxt->cpsz)) {
|
|
err = PTR_ERR(cxt->cpsz);
|
|
cxt->cpsz = NULL;
|
|
goto free_out;
|
|
}
|
|
|
|
off_size += info->ftrace_size;
|
|
cxt->fpszs = psz_init_zones(PSTORE_TYPE_FTRACE, &off,
|
|
info->ftrace_size,
|
|
info->ftrace_size / nr_cpu_ids,
|
|
&cxt->ftrace_max_cnt);
|
|
if (IS_ERR(cxt->fpszs)) {
|
|
err = PTR_ERR(cxt->fpszs);
|
|
cxt->fpszs = NULL;
|
|
goto free_out;
|
|
}
|
|
|
|
cxt->kpszs = psz_init_zones(PSTORE_TYPE_DMESG, &off,
|
|
info->total_size - off_size,
|
|
info->kmsg_size, &cxt->kmsg_max_cnt);
|
|
if (IS_ERR(cxt->kpszs)) {
|
|
err = PTR_ERR(cxt->kpszs);
|
|
cxt->kpszs = NULL;
|
|
goto free_out;
|
|
}
|
|
|
|
return 0;
|
|
free_out:
|
|
psz_free_all_zones(cxt);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* register_pstore_zone() - register to pstore/zone
|
|
*
|
|
* @info: back-end driver information. See &struct pstore_zone_info.
|
|
*
|
|
* Only one back-end at one time.
|
|
*
|
|
* Return: 0 on success, others on failure.
|
|
*/
|
|
int register_pstore_zone(struct pstore_zone_info *info)
|
|
{
|
|
int err = -EINVAL;
|
|
struct psz_context *cxt = &pstore_zone_cxt;
|
|
|
|
if (info->total_size < 4096) {
|
|
pr_warn("total_size must be >= 4096\n");
|
|
return -EINVAL;
|
|
}
|
|
if (info->total_size > SZ_128M) {
|
|
pr_warn("capping size to 128MiB\n");
|
|
info->total_size = SZ_128M;
|
|
}
|
|
|
|
if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
|
|
!info->ftrace_size) {
|
|
pr_warn("at least one record size must be non-zero\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!info->name || !info->name[0])
|
|
return -EINVAL;
|
|
|
|
#define check_size(name, size) { \
|
|
if (info->name > 0 && info->name < (size)) { \
|
|
pr_err(#name " must be over %d\n", (size)); \
|
|
return -EINVAL; \
|
|
} \
|
|
if (info->name & (size - 1)) { \
|
|
pr_err(#name " must be a multiple of %d\n", \
|
|
(size)); \
|
|
return -EINVAL; \
|
|
} \
|
|
}
|
|
|
|
check_size(total_size, 4096);
|
|
check_size(kmsg_size, SECTOR_SIZE);
|
|
check_size(pmsg_size, SECTOR_SIZE);
|
|
check_size(console_size, SECTOR_SIZE);
|
|
check_size(ftrace_size, SECTOR_SIZE);
|
|
|
|
#undef check_size
|
|
|
|
/*
|
|
* the @read and @write must be applied.
|
|
* if no @read, pstore may mount failed.
|
|
* if no @write, pstore do not support to remove record file.
|
|
*/
|
|
if (!info->read || !info->write) {
|
|
pr_err("no valid general read/write interface\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&cxt->pstore_zone_info_lock);
|
|
if (cxt->pstore_zone_info) {
|
|
pr_warn("'%s' already loaded: ignoring '%s'\n",
|
|
cxt->pstore_zone_info->name, info->name);
|
|
mutex_unlock(&cxt->pstore_zone_info_lock);
|
|
return -EBUSY;
|
|
}
|
|
cxt->pstore_zone_info = info;
|
|
|
|
pr_debug("register %s with properties:\n", info->name);
|
|
pr_debug("\ttotal size : %ld Bytes\n", info->total_size);
|
|
pr_debug("\tkmsg size : %ld Bytes\n", info->kmsg_size);
|
|
pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size);
|
|
pr_debug("\tconsole size : %ld Bytes\n", info->console_size);
|
|
pr_debug("\tftrace size : %ld Bytes\n", info->ftrace_size);
|
|
|
|
err = psz_alloc_zones(cxt);
|
|
if (err) {
|
|
pr_err("alloc zones failed\n");
|
|
goto fail_out;
|
|
}
|
|
|
|
if (info->kmsg_size) {
|
|
cxt->pstore.bufsize = cxt->kpszs[0]->buffer_size -
|
|
sizeof(struct psz_kmsg_header);
|
|
cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
|
|
if (!cxt->pstore.buf) {
|
|
err = -ENOMEM;
|
|
goto fail_free;
|
|
}
|
|
}
|
|
cxt->pstore.data = cxt;
|
|
|
|
pr_info("registered %s as backend for", info->name);
|
|
cxt->pstore.max_reason = info->max_reason;
|
|
cxt->pstore.name = info->name;
|
|
if (info->kmsg_size) {
|
|
cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
|
|
pr_cont(" kmsg(%s",
|
|
kmsg_dump_reason_str(cxt->pstore.max_reason));
|
|
if (cxt->pstore_zone_info->panic_write)
|
|
pr_cont(",panic_write");
|
|
pr_cont(")");
|
|
}
|
|
if (info->pmsg_size) {
|
|
cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
|
|
pr_cont(" pmsg");
|
|
}
|
|
if (info->console_size) {
|
|
cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
|
|
pr_cont(" console");
|
|
}
|
|
if (info->ftrace_size) {
|
|
cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
|
|
pr_cont(" ftrace");
|
|
}
|
|
pr_cont("\n");
|
|
|
|
err = pstore_register(&cxt->pstore);
|
|
if (err) {
|
|
pr_err("registering with pstore failed\n");
|
|
goto fail_free;
|
|
}
|
|
mutex_unlock(&pstore_zone_cxt.pstore_zone_info_lock);
|
|
|
|
return 0;
|
|
|
|
fail_free:
|
|
kfree(cxt->pstore.buf);
|
|
cxt->pstore.buf = NULL;
|
|
cxt->pstore.bufsize = 0;
|
|
psz_free_all_zones(cxt);
|
|
fail_out:
|
|
pstore_zone_cxt.pstore_zone_info = NULL;
|
|
mutex_unlock(&pstore_zone_cxt.pstore_zone_info_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_pstore_zone);
|
|
|
|
/**
|
|
* unregister_pstore_zone() - unregister to pstore/zone
|
|
*
|
|
* @info: back-end driver information. See struct pstore_zone_info.
|
|
*/
|
|
void unregister_pstore_zone(struct pstore_zone_info *info)
|
|
{
|
|
struct psz_context *cxt = &pstore_zone_cxt;
|
|
|
|
mutex_lock(&cxt->pstore_zone_info_lock);
|
|
if (!cxt->pstore_zone_info) {
|
|
mutex_unlock(&cxt->pstore_zone_info_lock);
|
|
return;
|
|
}
|
|
|
|
/* Stop incoming writes from pstore. */
|
|
pstore_unregister(&cxt->pstore);
|
|
|
|
/* Flush any pending writes. */
|
|
psz_flush_all_dirty_zones(NULL);
|
|
flush_delayed_work(&psz_cleaner);
|
|
|
|
/* Clean up allocations. */
|
|
kfree(cxt->pstore.buf);
|
|
cxt->pstore.buf = NULL;
|
|
cxt->pstore.bufsize = 0;
|
|
cxt->pstore_zone_info = NULL;
|
|
|
|
psz_free_all_zones(cxt);
|
|
|
|
/* Clear counters and zone state. */
|
|
cxt->oops_counter = 0;
|
|
cxt->panic_counter = 0;
|
|
atomic_set(&cxt->recovered, 0);
|
|
atomic_set(&cxt->on_panic, 0);
|
|
|
|
mutex_unlock(&cxt->pstore_zone_info_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_pstore_zone);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("WeiXiong Liao <liaoweixiong@allwinnertech.com>");
|
|
MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
|
|
MODULE_DESCRIPTION("Storage Manager for pstore/blk");
|