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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1056 lines
28 KiB
C
1056 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* /dev/nvram driver for PPC64
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/fcntl.h>
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#include <linux/nvram.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/kmsg_dump.h>
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#include <linux/pagemap.h>
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#include <linux/pstore.h>
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#include <linux/zlib.h>
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#include <linux/uaccess.h>
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#include <asm/nvram.h>
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#include <asm/rtas.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#undef DEBUG_NVRAM
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#define NVRAM_HEADER_LEN sizeof(struct nvram_header)
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#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN
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/* If change this size, then change the size of NVNAME_LEN */
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struct nvram_header {
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unsigned char signature;
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unsigned char checksum;
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unsigned short length;
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/* Terminating null required only for names < 12 chars. */
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char name[12];
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};
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struct nvram_partition {
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struct list_head partition;
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struct nvram_header header;
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unsigned int index;
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};
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static LIST_HEAD(nvram_partitions);
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#ifdef CONFIG_PPC_PSERIES
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struct nvram_os_partition rtas_log_partition = {
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.name = "ibm,rtas-log",
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.req_size = 2079,
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.min_size = 1055,
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.index = -1,
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.os_partition = true
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};
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#endif
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struct nvram_os_partition oops_log_partition = {
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.name = "lnx,oops-log",
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.req_size = 4000,
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.min_size = 2000,
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.index = -1,
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.os_partition = true
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};
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static const char *nvram_os_partitions[] = {
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#ifdef CONFIG_PPC_PSERIES
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"ibm,rtas-log",
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#endif
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"lnx,oops-log",
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NULL
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};
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static void oops_to_nvram(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason);
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static struct kmsg_dumper nvram_kmsg_dumper = {
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.dump = oops_to_nvram
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};
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/*
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* For capturing and compressing an oops or panic report...
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* big_oops_buf[] holds the uncompressed text we're capturing.
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*
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* oops_buf[] holds the compressed text, preceded by a oops header.
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* oops header has u16 holding the version of oops header (to differentiate
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* between old and new format header) followed by u16 holding the length of
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* the compressed* text (*Or uncompressed, if compression fails.) and u64
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* holding the timestamp. oops_buf[] gets written to NVRAM.
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*
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* oops_log_info points to the header. oops_data points to the compressed text.
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*
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* +- oops_buf
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* | +- oops_data
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* v v
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* +-----------+-----------+-----------+------------------------+
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* | version | length | timestamp | text |
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* | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
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* +-----------+-----------+-----------+------------------------+
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* ^
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* +- oops_log_info
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*
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* We preallocate these buffers during init to avoid kmalloc during oops/panic.
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*/
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static size_t big_oops_buf_sz;
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static char *big_oops_buf, *oops_buf;
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static char *oops_data;
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static size_t oops_data_sz;
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/* Compression parameters */
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#define COMPR_LEVEL 6
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#define WINDOW_BITS 12
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#define MEM_LEVEL 4
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static struct z_stream_s stream;
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#ifdef CONFIG_PSTORE
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#ifdef CONFIG_PPC_POWERNV
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static struct nvram_os_partition skiboot_partition = {
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.name = "ibm,skiboot",
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.index = -1,
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.os_partition = false
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};
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#endif
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#ifdef CONFIG_PPC_PSERIES
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static struct nvram_os_partition of_config_partition = {
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.name = "of-config",
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.index = -1,
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.os_partition = false
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};
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#endif
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static struct nvram_os_partition common_partition = {
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.name = "common",
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.index = -1,
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.os_partition = false
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};
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static enum pstore_type_id nvram_type_ids[] = {
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PSTORE_TYPE_DMESG,
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PSTORE_TYPE_PPC_COMMON,
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-1,
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-1,
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-1
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};
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static int read_type;
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#endif
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/* nvram_write_os_partition
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*
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* We need to buffer the error logs into nvram to ensure that we have
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* the failure information to decode. If we have a severe error there
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* is no way to guarantee that the OS or the machine is in a state to
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* get back to user land and write the error to disk. For example if
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* the SCSI device driver causes a Machine Check by writing to a bad
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* IO address, there is no way of guaranteeing that the device driver
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* is in any state that is would also be able to write the error data
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* captured to disk, thus we buffer it in NVRAM for analysis on the
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* next boot.
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*
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* In NVRAM the partition containing the error log buffer will looks like:
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* Header (in bytes):
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* +-----------+----------+--------+------------+------------------+
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* | signature | checksum | length | name | data |
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* |0 |1 |2 3|4 15|16 length-1|
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* +-----------+----------+--------+------------+------------------+
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*
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* The 'data' section would look like (in bytes):
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* +--------------+------------+-----------------------------------+
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* | event_logged | sequence # | error log |
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* |0 3|4 7|8 error_log_size-1|
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* +--------------+------------+-----------------------------------+
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*
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* event_logged: 0 if event has not been logged to syslog, 1 if it has
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* sequence #: The unique sequence # for each event. (until it wraps)
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* error log: The error log from event_scan
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*/
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int nvram_write_os_partition(struct nvram_os_partition *part,
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char *buff, int length,
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unsigned int err_type,
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unsigned int error_log_cnt)
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{
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int rc;
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loff_t tmp_index;
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struct err_log_info info;
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if (part->index == -1)
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return -ESPIPE;
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if (length > part->size)
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length = part->size;
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info.error_type = cpu_to_be32(err_type);
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info.seq_num = cpu_to_be32(error_log_cnt);
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tmp_index = part->index;
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rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index);
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if (rc <= 0) {
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pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
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return rc;
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}
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rc = ppc_md.nvram_write(buff, length, &tmp_index);
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if (rc <= 0) {
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pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
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return rc;
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}
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return 0;
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}
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/* nvram_read_partition
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*
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* Reads nvram partition for at most 'length'
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*/
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int nvram_read_partition(struct nvram_os_partition *part, char *buff,
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int length, unsigned int *err_type,
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unsigned int *error_log_cnt)
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{
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int rc;
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loff_t tmp_index;
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struct err_log_info info;
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if (part->index == -1)
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return -1;
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if (length > part->size)
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length = part->size;
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tmp_index = part->index;
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if (part->os_partition) {
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rc = ppc_md.nvram_read((char *)&info, sizeof(info), &tmp_index);
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if (rc <= 0) {
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pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
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return rc;
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}
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}
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rc = ppc_md.nvram_read(buff, length, &tmp_index);
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if (rc <= 0) {
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pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
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return rc;
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}
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if (part->os_partition) {
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*error_log_cnt = be32_to_cpu(info.seq_num);
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*err_type = be32_to_cpu(info.error_type);
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}
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return 0;
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}
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/* nvram_init_os_partition
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*
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* This sets up a partition with an "OS" signature.
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*
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* The general strategy is the following:
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* 1.) If a partition with the indicated name already exists...
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* - If it's large enough, use it.
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* - Otherwise, recycle it and keep going.
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* 2.) Search for a free partition that is large enough.
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* 3.) If there's not a free partition large enough, recycle any obsolete
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* OS partitions and try again.
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* 4.) Will first try getting a chunk that will satisfy the requested size.
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* 5.) If a chunk of the requested size cannot be allocated, then try finding
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* a chunk that will satisfy the minum needed.
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*
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* Returns 0 on success, else -1.
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*/
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int __init nvram_init_os_partition(struct nvram_os_partition *part)
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{
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loff_t p;
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int size;
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/* Look for ours */
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p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
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/* Found one but too small, remove it */
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if (p && size < part->min_size) {
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pr_info("nvram: Found too small %s partition,"
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" removing it...\n", part->name);
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nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
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p = 0;
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}
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/* Create one if we didn't find */
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if (!p) {
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p = nvram_create_partition(part->name, NVRAM_SIG_OS,
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part->req_size, part->min_size);
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if (p == -ENOSPC) {
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pr_info("nvram: No room to create %s partition, "
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"deleting any obsolete OS partitions...\n",
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part->name);
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nvram_remove_partition(NULL, NVRAM_SIG_OS,
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nvram_os_partitions);
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p = nvram_create_partition(part->name, NVRAM_SIG_OS,
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part->req_size, part->min_size);
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}
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}
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if (p <= 0) {
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pr_err("nvram: Failed to find or create %s"
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" partition, err %d\n", part->name, (int)p);
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return -1;
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}
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part->index = p;
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part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
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return 0;
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}
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/* Derived from logfs_compress() */
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static int nvram_compress(const void *in, void *out, size_t inlen,
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size_t outlen)
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{
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int err, ret;
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ret = -EIO;
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err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
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MEM_LEVEL, Z_DEFAULT_STRATEGY);
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if (err != Z_OK)
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goto error;
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stream.next_in = in;
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stream.avail_in = inlen;
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stream.total_in = 0;
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stream.next_out = out;
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stream.avail_out = outlen;
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stream.total_out = 0;
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err = zlib_deflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END)
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goto error;
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err = zlib_deflateEnd(&stream);
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if (err != Z_OK)
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goto error;
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if (stream.total_out >= stream.total_in)
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goto error;
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ret = stream.total_out;
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error:
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return ret;
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}
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/* Compress the text from big_oops_buf into oops_buf. */
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static int zip_oops(size_t text_len)
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{
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struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
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int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
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oops_data_sz);
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if (zipped_len < 0) {
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pr_err("nvram: compression failed; returned %d\n", zipped_len);
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pr_err("nvram: logging uncompressed oops/panic report\n");
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return -1;
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}
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oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
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oops_hdr->report_length = cpu_to_be16(zipped_len);
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oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
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return 0;
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}
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#ifdef CONFIG_PSTORE
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static int nvram_pstore_open(struct pstore_info *psi)
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{
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/* Reset the iterator to start reading partitions again */
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read_type = -1;
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return 0;
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}
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/**
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* nvram_pstore_write - pstore write callback for nvram
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* @record: pstore record to write, with @id to be set
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*
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* Called by pstore_dump() when an oops or panic report is logged in the
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* printk buffer.
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* Returns 0 on successful write.
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*/
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static int nvram_pstore_write(struct pstore_record *record)
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{
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int rc;
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unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
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struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
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/* part 1 has the recent messages from printk buffer */
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if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG))
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return -1;
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if (clobbering_unread_rtas_event())
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return -1;
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oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
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oops_hdr->report_length = cpu_to_be16(record->size);
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oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
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if (record->compressed)
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err_type = ERR_TYPE_KERNEL_PANIC_GZ;
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rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
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(int) (sizeof(*oops_hdr) + record->size), err_type,
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record->count);
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if (rc != 0)
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return rc;
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record->id = record->part;
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return 0;
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}
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|
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/*
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* Reads the oops/panic report, rtas, of-config and common partition.
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* Returns the length of the data we read from each partition.
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* Returns 0 if we've been called before.
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*/
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static ssize_t nvram_pstore_read(struct pstore_record *record)
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{
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struct oops_log_info *oops_hdr;
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unsigned int err_type, id_no, size = 0;
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struct nvram_os_partition *part = NULL;
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char *buff = NULL;
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int sig = 0;
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loff_t p;
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read_type++;
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switch (nvram_type_ids[read_type]) {
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case PSTORE_TYPE_DMESG:
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part = &oops_log_partition;
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record->type = PSTORE_TYPE_DMESG;
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break;
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case PSTORE_TYPE_PPC_COMMON:
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sig = NVRAM_SIG_SYS;
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part = &common_partition;
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record->type = PSTORE_TYPE_PPC_COMMON;
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record->id = PSTORE_TYPE_PPC_COMMON;
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record->time.tv_sec = 0;
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record->time.tv_nsec = 0;
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break;
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#ifdef CONFIG_PPC_PSERIES
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case PSTORE_TYPE_PPC_RTAS:
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part = &rtas_log_partition;
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record->type = PSTORE_TYPE_PPC_RTAS;
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record->time.tv_sec = last_rtas_event;
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record->time.tv_nsec = 0;
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break;
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case PSTORE_TYPE_PPC_OF:
|
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sig = NVRAM_SIG_OF;
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part = &of_config_partition;
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record->type = PSTORE_TYPE_PPC_OF;
|
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record->id = PSTORE_TYPE_PPC_OF;
|
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record->time.tv_sec = 0;
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record->time.tv_nsec = 0;
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break;
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#endif
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#ifdef CONFIG_PPC_POWERNV
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case PSTORE_TYPE_PPC_OPAL:
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sig = NVRAM_SIG_FW;
|
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part = &skiboot_partition;
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record->type = PSTORE_TYPE_PPC_OPAL;
|
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record->id = PSTORE_TYPE_PPC_OPAL;
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record->time.tv_sec = 0;
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record->time.tv_nsec = 0;
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break;
|
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#endif
|
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default:
|
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return 0;
|
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}
|
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|
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if (!part->os_partition) {
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p = nvram_find_partition(part->name, sig, &size);
|
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if (p <= 0) {
|
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pr_err("nvram: Failed to find partition %s, "
|
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"err %d\n", part->name, (int)p);
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return 0;
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}
|
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part->index = p;
|
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part->size = size;
|
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}
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|
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buff = kmalloc(part->size, GFP_KERNEL);
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|
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if (!buff)
|
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return -ENOMEM;
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|
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if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
|
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kfree(buff);
|
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return 0;
|
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}
|
|
|
|
record->count = 0;
|
|
|
|
if (part->os_partition)
|
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record->id = id_no;
|
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|
|
if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
|
|
size_t length, hdr_size;
|
|
|
|
oops_hdr = (struct oops_log_info *)buff;
|
|
if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
|
|
/* Old format oops header had 2-byte record size */
|
|
hdr_size = sizeof(u16);
|
|
length = be16_to_cpu(oops_hdr->version);
|
|
record->time.tv_sec = 0;
|
|
record->time.tv_nsec = 0;
|
|
} else {
|
|
hdr_size = sizeof(*oops_hdr);
|
|
length = be16_to_cpu(oops_hdr->report_length);
|
|
record->time.tv_sec = be64_to_cpu(oops_hdr->timestamp);
|
|
record->time.tv_nsec = 0;
|
|
}
|
|
record->buf = kmemdup(buff + hdr_size, length, GFP_KERNEL);
|
|
kfree(buff);
|
|
if (record->buf == NULL)
|
|
return -ENOMEM;
|
|
|
|
record->ecc_notice_size = 0;
|
|
if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
|
|
record->compressed = true;
|
|
else
|
|
record->compressed = false;
|
|
return length;
|
|
}
|
|
|
|
record->buf = buff;
|
|
return part->size;
|
|
}
|
|
|
|
static struct pstore_info nvram_pstore_info = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nvram",
|
|
.flags = PSTORE_FLAGS_DMESG,
|
|
.open = nvram_pstore_open,
|
|
.read = nvram_pstore_read,
|
|
.write = nvram_pstore_write,
|
|
};
|
|
|
|
static int nvram_pstore_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (machine_is(pseries)) {
|
|
nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
|
|
nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
|
|
} else
|
|
nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL;
|
|
|
|
nvram_pstore_info.buf = oops_data;
|
|
nvram_pstore_info.bufsize = oops_data_sz;
|
|
|
|
rc = pstore_register(&nvram_pstore_info);
|
|
if (rc && (rc != -EPERM))
|
|
/* Print error only when pstore.backend == nvram */
|
|
pr_err("nvram: pstore_register() failed, returned %d. "
|
|
"Defaults to kmsg_dump\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
#else
|
|
static int nvram_pstore_init(void)
|
|
{
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
void __init nvram_init_oops_partition(int rtas_partition_exists)
|
|
{
|
|
int rc;
|
|
|
|
rc = nvram_init_os_partition(&oops_log_partition);
|
|
if (rc != 0) {
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
if (!rtas_partition_exists) {
|
|
pr_err("nvram: Failed to initialize oops partition!");
|
|
return;
|
|
}
|
|
pr_notice("nvram: Using %s partition to log both"
|
|
" RTAS errors and oops/panic reports\n",
|
|
rtas_log_partition.name);
|
|
memcpy(&oops_log_partition, &rtas_log_partition,
|
|
sizeof(rtas_log_partition));
|
|
#else
|
|
pr_err("nvram: Failed to initialize oops partition!");
|
|
return;
|
|
#endif
|
|
}
|
|
oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
|
|
if (!oops_buf) {
|
|
pr_err("nvram: No memory for %s partition\n",
|
|
oops_log_partition.name);
|
|
return;
|
|
}
|
|
oops_data = oops_buf + sizeof(struct oops_log_info);
|
|
oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
|
|
|
|
rc = nvram_pstore_init();
|
|
|
|
if (!rc)
|
|
return;
|
|
|
|
/*
|
|
* Figure compression (preceded by elimination of each line's <n>
|
|
* severity prefix) will reduce the oops/panic report to at most
|
|
* 45% of its original size.
|
|
*/
|
|
big_oops_buf_sz = (oops_data_sz * 100) / 45;
|
|
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
|
|
if (big_oops_buf) {
|
|
stream.workspace = kmalloc(zlib_deflate_workspacesize(
|
|
WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
|
|
if (!stream.workspace) {
|
|
pr_err("nvram: No memory for compression workspace; "
|
|
"skipping compression of %s partition data\n",
|
|
oops_log_partition.name);
|
|
kfree(big_oops_buf);
|
|
big_oops_buf = NULL;
|
|
}
|
|
} else {
|
|
pr_err("No memory for uncompressed %s data; "
|
|
"skipping compression\n", oops_log_partition.name);
|
|
stream.workspace = NULL;
|
|
}
|
|
|
|
rc = kmsg_dump_register(&nvram_kmsg_dumper);
|
|
if (rc != 0) {
|
|
pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
|
|
kfree(oops_buf);
|
|
kfree(big_oops_buf);
|
|
kfree(stream.workspace);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is our kmsg_dump callback, called after an oops or panic report
|
|
* has been written to the printk buffer. We want to capture as much
|
|
* of the printk buffer as possible. First, capture as much as we can
|
|
* that we think will compress sufficiently to fit in the lnx,oops-log
|
|
* partition. If that's too much, go back and capture uncompressed text.
|
|
*/
|
|
static void oops_to_nvram(struct kmsg_dumper *dumper,
|
|
enum kmsg_dump_reason reason)
|
|
{
|
|
struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
|
|
static unsigned int oops_count = 0;
|
|
static bool panicking = false;
|
|
static DEFINE_SPINLOCK(lock);
|
|
unsigned long flags;
|
|
size_t text_len;
|
|
unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
|
|
int rc = -1;
|
|
|
|
switch (reason) {
|
|
case KMSG_DUMP_RESTART:
|
|
case KMSG_DUMP_HALT:
|
|
case KMSG_DUMP_POWEROFF:
|
|
/* These are almost always orderly shutdowns. */
|
|
return;
|
|
case KMSG_DUMP_OOPS:
|
|
break;
|
|
case KMSG_DUMP_PANIC:
|
|
panicking = true;
|
|
break;
|
|
case KMSG_DUMP_EMERG:
|
|
if (panicking)
|
|
/* Panic report already captured. */
|
|
return;
|
|
break;
|
|
default:
|
|
pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
|
|
__func__, (int) reason);
|
|
return;
|
|
}
|
|
|
|
if (clobbering_unread_rtas_event())
|
|
return;
|
|
|
|
if (!spin_trylock_irqsave(&lock, flags))
|
|
return;
|
|
|
|
if (big_oops_buf) {
|
|
kmsg_dump_get_buffer(dumper, false,
|
|
big_oops_buf, big_oops_buf_sz, &text_len);
|
|
rc = zip_oops(text_len);
|
|
}
|
|
if (rc != 0) {
|
|
kmsg_dump_rewind(dumper);
|
|
kmsg_dump_get_buffer(dumper, false,
|
|
oops_data, oops_data_sz, &text_len);
|
|
err_type = ERR_TYPE_KERNEL_PANIC;
|
|
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
|
|
oops_hdr->report_length = cpu_to_be16(text_len);
|
|
oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
|
|
}
|
|
|
|
(void) nvram_write_os_partition(&oops_log_partition, oops_buf,
|
|
(int) (sizeof(*oops_hdr) + text_len), err_type,
|
|
++oops_count);
|
|
|
|
spin_unlock_irqrestore(&lock, flags);
|
|
}
|
|
|
|
#ifdef DEBUG_NVRAM
|
|
static void __init nvram_print_partitions(char * label)
|
|
{
|
|
struct nvram_partition * tmp_part;
|
|
|
|
printk(KERN_WARNING "--------%s---------\n", label);
|
|
printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
|
|
list_for_each_entry(tmp_part, &nvram_partitions, partition) {
|
|
printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n",
|
|
tmp_part->index, tmp_part->header.signature,
|
|
tmp_part->header.checksum, tmp_part->header.length,
|
|
tmp_part->header.name);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static int __init nvram_write_header(struct nvram_partition * part)
|
|
{
|
|
loff_t tmp_index;
|
|
int rc;
|
|
struct nvram_header phead;
|
|
|
|
memcpy(&phead, &part->header, NVRAM_HEADER_LEN);
|
|
phead.length = cpu_to_be16(phead.length);
|
|
|
|
tmp_index = part->index;
|
|
rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static unsigned char __init nvram_checksum(struct nvram_header *p)
|
|
{
|
|
unsigned int c_sum, c_sum2;
|
|
unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
|
|
c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
|
|
|
|
/* The sum may have spilled into the 3rd byte. Fold it back. */
|
|
c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
|
|
/* The sum cannot exceed 2 bytes. Fold it into a checksum */
|
|
c_sum2 = (c_sum >> 8) + (c_sum << 8);
|
|
c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
|
|
return c_sum;
|
|
}
|
|
|
|
/*
|
|
* Per the criteria passed via nvram_remove_partition(), should this
|
|
* partition be removed? 1=remove, 0=keep
|
|
*/
|
|
static int nvram_can_remove_partition(struct nvram_partition *part,
|
|
const char *name, int sig, const char *exceptions[])
|
|
{
|
|
if (part->header.signature != sig)
|
|
return 0;
|
|
if (name) {
|
|
if (strncmp(name, part->header.name, 12))
|
|
return 0;
|
|
} else if (exceptions) {
|
|
const char **except;
|
|
for (except = exceptions; *except; except++) {
|
|
if (!strncmp(*except, part->header.name, 12))
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* nvram_remove_partition - Remove one or more partitions in nvram
|
|
* @name: name of the partition to remove, or NULL for a
|
|
* signature only match
|
|
* @sig: signature of the partition(s) to remove
|
|
* @exceptions: When removing all partitions with a matching signature,
|
|
* leave these alone.
|
|
*/
|
|
|
|
int __init nvram_remove_partition(const char *name, int sig,
|
|
const char *exceptions[])
|
|
{
|
|
struct nvram_partition *part, *prev, *tmp;
|
|
int rc;
|
|
|
|
list_for_each_entry(part, &nvram_partitions, partition) {
|
|
if (!nvram_can_remove_partition(part, name, sig, exceptions))
|
|
continue;
|
|
|
|
/* Make partition a free partition */
|
|
part->header.signature = NVRAM_SIG_FREE;
|
|
memset(part->header.name, 'w', 12);
|
|
part->header.checksum = nvram_checksum(&part->header);
|
|
rc = nvram_write_header(part);
|
|
if (rc <= 0) {
|
|
printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* Merge contiguous ones */
|
|
prev = NULL;
|
|
list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) {
|
|
if (part->header.signature != NVRAM_SIG_FREE) {
|
|
prev = NULL;
|
|
continue;
|
|
}
|
|
if (prev) {
|
|
prev->header.length += part->header.length;
|
|
prev->header.checksum = nvram_checksum(&prev->header);
|
|
rc = nvram_write_header(prev);
|
|
if (rc <= 0) {
|
|
printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
|
|
return rc;
|
|
}
|
|
list_del(&part->partition);
|
|
kfree(part);
|
|
} else
|
|
prev = part;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nvram_create_partition - Create a partition in nvram
|
|
* @name: name of the partition to create
|
|
* @sig: signature of the partition to create
|
|
* @req_size: size of data to allocate in bytes
|
|
* @min_size: minimum acceptable size (0 means req_size)
|
|
*
|
|
* Returns a negative error code or a positive nvram index
|
|
* of the beginning of the data area of the newly created
|
|
* partition. If you provided a min_size smaller than req_size
|
|
* you need to query for the actual size yourself after the
|
|
* call using nvram_partition_get_size().
|
|
*/
|
|
loff_t __init nvram_create_partition(const char *name, int sig,
|
|
int req_size, int min_size)
|
|
{
|
|
struct nvram_partition *part;
|
|
struct nvram_partition *new_part;
|
|
struct nvram_partition *free_part = NULL;
|
|
static char nv_init_vals[16];
|
|
loff_t tmp_index;
|
|
long size = 0;
|
|
int rc;
|
|
|
|
BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
|
|
|
|
/* Convert sizes from bytes to blocks */
|
|
req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
|
|
min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
|
|
|
|
/* If no minimum size specified, make it the same as the
|
|
* requested size
|
|
*/
|
|
if (min_size == 0)
|
|
min_size = req_size;
|
|
if (min_size > req_size)
|
|
return -EINVAL;
|
|
|
|
/* Now add one block to each for the header */
|
|
req_size += 1;
|
|
min_size += 1;
|
|
|
|
/* Find a free partition that will give us the maximum needed size
|
|
If can't find one that will give us the minimum size needed */
|
|
list_for_each_entry(part, &nvram_partitions, partition) {
|
|
if (part->header.signature != NVRAM_SIG_FREE)
|
|
continue;
|
|
|
|
if (part->header.length >= req_size) {
|
|
size = req_size;
|
|
free_part = part;
|
|
break;
|
|
}
|
|
if (part->header.length > size &&
|
|
part->header.length >= min_size) {
|
|
size = part->header.length;
|
|
free_part = part;
|
|
}
|
|
}
|
|
if (!size)
|
|
return -ENOSPC;
|
|
|
|
/* Create our OS partition */
|
|
new_part = kzalloc(sizeof(*new_part), GFP_KERNEL);
|
|
if (!new_part) {
|
|
pr_err("%s: kmalloc failed\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
new_part->index = free_part->index;
|
|
new_part->header.signature = sig;
|
|
new_part->header.length = size;
|
|
memcpy(new_part->header.name, name, strnlen(name, sizeof(new_part->header.name)));
|
|
new_part->header.checksum = nvram_checksum(&new_part->header);
|
|
|
|
rc = nvram_write_header(new_part);
|
|
if (rc <= 0) {
|
|
pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc);
|
|
kfree(new_part);
|
|
return rc;
|
|
}
|
|
list_add_tail(&new_part->partition, &free_part->partition);
|
|
|
|
/* Adjust or remove the partition we stole the space from */
|
|
if (free_part->header.length > size) {
|
|
free_part->index += size * NVRAM_BLOCK_LEN;
|
|
free_part->header.length -= size;
|
|
free_part->header.checksum = nvram_checksum(&free_part->header);
|
|
rc = nvram_write_header(free_part);
|
|
if (rc <= 0) {
|
|
pr_err("%s: nvram_write_header failed (%d)\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
} else {
|
|
list_del(&free_part->partition);
|
|
kfree(free_part);
|
|
}
|
|
|
|
/* Clear the new partition */
|
|
for (tmp_index = new_part->index + NVRAM_HEADER_LEN;
|
|
tmp_index < ((size - 1) * NVRAM_BLOCK_LEN);
|
|
tmp_index += NVRAM_BLOCK_LEN) {
|
|
rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
|
|
if (rc <= 0) {
|
|
pr_err("%s: nvram_write failed (%d)\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return new_part->index + NVRAM_HEADER_LEN;
|
|
}
|
|
|
|
/**
|
|
* nvram_get_partition_size - Get the data size of an nvram partition
|
|
* @data_index: This is the offset of the start of the data of
|
|
* the partition. The same value that is returned by
|
|
* nvram_create_partition().
|
|
*/
|
|
int nvram_get_partition_size(loff_t data_index)
|
|
{
|
|
struct nvram_partition *part;
|
|
|
|
list_for_each_entry(part, &nvram_partitions, partition) {
|
|
if (part->index + NVRAM_HEADER_LEN == data_index)
|
|
return (part->header.length - 1) * NVRAM_BLOCK_LEN;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* nvram_find_partition - Find an nvram partition by signature and name
|
|
* @name: Name of the partition or NULL for any name
|
|
* @sig: Signature to test against
|
|
* @out_size: if non-NULL, returns the size of the data part of the partition
|
|
*/
|
|
loff_t nvram_find_partition(const char *name, int sig, int *out_size)
|
|
{
|
|
struct nvram_partition *p;
|
|
|
|
list_for_each_entry(p, &nvram_partitions, partition) {
|
|
if (p->header.signature == sig &&
|
|
(!name || !strncmp(p->header.name, name, 12))) {
|
|
if (out_size)
|
|
*out_size = (p->header.length - 1) *
|
|
NVRAM_BLOCK_LEN;
|
|
return p->index + NVRAM_HEADER_LEN;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __init nvram_scan_partitions(void)
|
|
{
|
|
loff_t cur_index = 0;
|
|
struct nvram_header phead;
|
|
struct nvram_partition * tmp_part;
|
|
unsigned char c_sum;
|
|
char * header;
|
|
int total_size;
|
|
int err;
|
|
|
|
if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
|
|
return -ENODEV;
|
|
total_size = ppc_md.nvram_size();
|
|
|
|
header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
|
|
if (!header) {
|
|
printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
while (cur_index < total_size) {
|
|
|
|
err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
|
|
if (err != NVRAM_HEADER_LEN) {
|
|
printk(KERN_ERR "nvram_scan_partitions: Error parsing "
|
|
"nvram partitions\n");
|
|
goto out;
|
|
}
|
|
|
|
cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
|
|
|
|
memcpy(&phead, header, NVRAM_HEADER_LEN);
|
|
|
|
phead.length = be16_to_cpu(phead.length);
|
|
|
|
err = 0;
|
|
c_sum = nvram_checksum(&phead);
|
|
if (c_sum != phead.checksum) {
|
|
printk(KERN_WARNING "WARNING: nvram partition checksum"
|
|
" was %02x, should be %02x!\n",
|
|
phead.checksum, c_sum);
|
|
printk(KERN_WARNING "Terminating nvram partition scan\n");
|
|
goto out;
|
|
}
|
|
if (!phead.length) {
|
|
printk(KERN_WARNING "WARNING: nvram corruption "
|
|
"detected: 0-length partition\n");
|
|
goto out;
|
|
}
|
|
tmp_part = kmalloc(sizeof(*tmp_part), GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!tmp_part) {
|
|
printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
|
|
tmp_part->index = cur_index;
|
|
list_add_tail(&tmp_part->partition, &nvram_partitions);
|
|
|
|
cur_index += phead.length * NVRAM_BLOCK_LEN;
|
|
}
|
|
err = 0;
|
|
|
|
#ifdef DEBUG_NVRAM
|
|
nvram_print_partitions("NVRAM Partitions");
|
|
#endif
|
|
|
|
out:
|
|
kfree(header);
|
|
return err;
|
|
}
|