Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  c 2001 PPC 64 Team, IBM Corp
 *
 * /dev/nvram driver for PPC64
 */
 
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/fcntl.h>
#include <linux/nvram.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kmsg_dump.h>
#include <linux/pagemap.h>
#include <linux/pstore.h>
#include <linux/zlib.h>
#include <linux/uaccess.h>
#include <asm/nvram.h>
#include <asm/rtas.h>
#include <asm/prom.h>
#include <asm/machdep.h>
 
#undef DEBUG_NVRAM
 
#define NVRAM_HEADER_LEN	sizeof(struct nvram_header)
#define NVRAM_BLOCK_LEN		NVRAM_HEADER_LEN
 
/* If change this size, then change the size of NVNAME_LEN */
struct nvram_header {
<------>unsigned char signature;
<------>unsigned char checksum;
<------>unsigned short length;
<------>/* Terminating null required only for names < 12 chars. */
<------>char name[12];
};
 
struct nvram_partition {
<------>struct list_head partition;
<------>struct nvram_header header;
<------>unsigned int index;
};
 
static LIST_HEAD(nvram_partitions);
 
#ifdef CONFIG_PPC_PSERIES
struct nvram_os_partition rtas_log_partition = {
<------>.name = "ibm,rtas-log",
<------>.req_size = 2079,
<------>.min_size = 1055,
<------>.index = -1,
<------>.os_partition = true
};
#endif
 
struct nvram_os_partition oops_log_partition = {
<------>.name = "lnx,oops-log",
<------>.req_size = 4000,
<------>.min_size = 2000,
<------>.index = -1,
<------>.os_partition = true
};
 
static const char *nvram_os_partitions[] = {
#ifdef CONFIG_PPC_PSERIES
<------>"ibm,rtas-log",
#endif
<------>"lnx,oops-log",
<------>NULL
};
 
static void oops_to_nvram(struct kmsg_dumper *dumper,
<------><------><------>  enum kmsg_dump_reason reason);
 
static struct kmsg_dumper nvram_kmsg_dumper = {
<------>.dump = oops_to_nvram
};
 
/*
 * For capturing and compressing an oops or panic report...
 
 * big_oops_buf[] holds the uncompressed text we're capturing.
 *
 * oops_buf[] holds the compressed text, preceded by a oops header.
 * oops header has u16 holding the version of oops header (to differentiate
 * between old and new format header) followed by u16 holding the length of
 * the compressed* text (*Or uncompressed, if compression fails.) and u64
 * holding the timestamp. oops_buf[] gets written to NVRAM.
 *
 * oops_log_info points to the header. oops_data points to the compressed text.
 *
 * +- oops_buf
 * |                                   +- oops_data
 * v                                   v
 * +-----------+-----------+-----------+------------------------+
 * | version   | length    | timestamp | text                   |
 * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes)   |
 * +-----------+-----------+-----------+------------------------+
 * ^
 * +- oops_log_info
 *
 * We preallocate these buffers during init to avoid kmalloc during oops/panic.
 */
static size_t big_oops_buf_sz;
static char *big_oops_buf, *oops_buf;
static char *oops_data;
static size_t oops_data_sz;
 
/* Compression parameters */
#define COMPR_LEVEL 6
#define WINDOW_BITS 12
#define MEM_LEVEL 4
static struct z_stream_s stream;
 
#ifdef CONFIG_PSTORE
#ifdef CONFIG_PPC_POWERNV
static struct nvram_os_partition skiboot_partition = {
<------>.name = "ibm,skiboot",
<------>.index = -1,
<------>.os_partition = false
};
#endif
 
#ifdef CONFIG_PPC_PSERIES
static struct nvram_os_partition of_config_partition = {
<------>.name = "of-config",
<------>.index = -1,
<------>.os_partition = false
};
#endif
 
static struct nvram_os_partition common_partition = {
<------>.name = "common",
<------>.index = -1,
<------>.os_partition = false
};
 
static enum pstore_type_id nvram_type_ids[] = {
<------>PSTORE_TYPE_DMESG,
<------>PSTORE_TYPE_PPC_COMMON,
<------>-1,
<------>-1,
<------>-1
};
static int read_type;
#endif
 
/* nvram_write_os_partition
 *
 * We need to buffer the error logs into nvram to ensure that we have
 * the failure information to decode.  If we have a severe error there
 * is no way to guarantee that the OS or the machine is in a state to
 * get back to user land and write the error to disk.  For example if
 * the SCSI device driver causes a Machine Check by writing to a bad
 * IO address, there is no way of guaranteeing that the device driver
 * is in any state that is would also be able to write the error data
 * captured to disk, thus we buffer it in NVRAM for analysis on the
 * next boot.
 *
 * In NVRAM the partition containing the error log buffer will looks like:
 * Header (in bytes):
 * +-----------+----------+--------+------------+------------------+
 * | signature | checksum | length | name       | data             |
 * |0          |1         |2      3|4         15|16        length-1|
 * +-----------+----------+--------+------------+------------------+
 *
 * The 'data' section would look like (in bytes):
 * +--------------+------------+-----------------------------------+
 * | event_logged | sequence # | error log                         |
 * |0            3|4          7|8                  error_log_size-1|
 * +--------------+------------+-----------------------------------+
 *
 * event_logged: 0 if event has not been logged to syslog, 1 if it has
 * sequence #: The unique sequence # for each event. (until it wraps)
 * error log: The error log from event_scan
 */
int nvram_write_os_partition(struct nvram_os_partition *part,
<------><------><------>     char *buff, int length,
<------><------><------>     unsigned int err_type,
<------><------><------>     unsigned int error_log_cnt)
{
<------>int rc;
<------>loff_t tmp_index;
<------>struct err_log_info info;
 
<------>if (part->index == -1)
<------><------>return -ESPIPE;
 
<------>if (length > part->size)
<------><------>length = part->size;
 
<------>info.error_type = cpu_to_be32(err_type);
<------>info.seq_num = cpu_to_be32(error_log_cnt);
 
<------>tmp_index = part->index;
 
<------>rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index);
<------>if (rc <= 0) {
<------><------>pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
<------><------>return rc;
<------>}
 
<------>rc = ppc_md.nvram_write(buff, length, &tmp_index);
<------>if (rc <= 0) {
<------><------>pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
<------><------>return rc;
<------>}
 
<------>return 0;
}
 
/* nvram_read_partition
 *
 * Reads nvram partition for at most 'length'
 */
int nvram_read_partition(struct nvram_os_partition *part, char *buff,
<------><------><------> int length, unsigned int *err_type,
<------><------><------> unsigned int *error_log_cnt)
{
<------>int rc;
<------>loff_t tmp_index;
<------>struct err_log_info info;
 
<------>if (part->index == -1)
<------><------>return -1;
 
<------>if (length > part->size)
<------><------>length = part->size;
 
<------>tmp_index = part->index;
 
<------>if (part->os_partition) {
<------><------>rc = ppc_md.nvram_read((char *)&info, sizeof(info), &tmp_index);
<------><------>if (rc <= 0) {
<------><------><------>pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
<------><------><------>return rc;
<------><------>}
<------>}
 
<------>rc = ppc_md.nvram_read(buff, length, &tmp_index);
<------>if (rc <= 0) {
<------><------>pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
<------><------>return rc;
<------>}
 
<------>if (part->os_partition) {
<------><------>*error_log_cnt = be32_to_cpu(info.seq_num);
<------><------>*err_type = be32_to_cpu(info.error_type);
<------>}
 
<------>return 0;
}
 
/* nvram_init_os_partition
 *
 * This sets up a partition with an "OS" signature.
 *
 * The general strategy is the following:
 * 1.) If a partition with the indicated name already exists...
 *	- If it's large enough, use it.
 *	- Otherwise, recycle it and keep going.
 * 2.) Search for a free partition that is large enough.
 * 3.) If there's not a free partition large enough, recycle any obsolete
 * OS partitions and try again.
 * 4.) Will first try getting a chunk that will satisfy the requested size.
 * 5.) If a chunk of the requested size cannot be allocated, then try finding
 * a chunk that will satisfy the minum needed.
 *
 * Returns 0 on success, else -1.
 */
int __init nvram_init_os_partition(struct nvram_os_partition *part)
{
<------>loff_t p;
<------>int size;
 
<------>/* Look for ours */
<------>p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
 
<------>/* Found one but too small, remove it */
<------>if (p && size < part->min_size) {
<------><------>pr_info("nvram: Found too small %s partition,"
<------><------><------><------><------>" removing it...\n", part->name);
<------><------>nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
<------><------>p = 0;
<------>}
 
<------>/* Create one if we didn't find */
<------>if (!p) {
<------><------>p = nvram_create_partition(part->name, NVRAM_SIG_OS,
<------><------><------><------><------>part->req_size, part->min_size);
<------><------>if (p == -ENOSPC) {
<------><------><------>pr_info("nvram: No room to create %s partition, "
<------><------><------><------>"deleting any obsolete OS partitions...\n",
<------><------><------><------>part->name);
<------><------><------>nvram_remove_partition(NULL, NVRAM_SIG_OS,
<------><------><------><------><------>nvram_os_partitions);
<------><------><------>p = nvram_create_partition(part->name, NVRAM_SIG_OS,
<------><------><------><------><------>part->req_size, part->min_size);
<------><------>}
<------>}
 
<------>if (p <= 0) {
<------><------>pr_err("nvram: Failed to find or create %s"
<------><------>       " partition, err %d\n", part->name, (int)p);
<------><------>return -1;
<------>}
 
<------>part->index = p;
<------>part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
 
<------>return 0;
}
 
/* Derived from logfs_compress() */
static int nvram_compress(const void *in, void *out, size_t inlen,
<------><------><------><------><------><------><------>size_t outlen)
{
<------>int err, ret;
 
<------>ret = -EIO;
<------>err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
<------><------><------><------><------><------>MEM_LEVEL, Z_DEFAULT_STRATEGY);
<------>if (err != Z_OK)
<------><------>goto error;
 
<------>stream.next_in = in;
<------>stream.avail_in = inlen;
<------>stream.total_in = 0;
<------>stream.next_out = out;
<------>stream.avail_out = outlen;
<------>stream.total_out = 0;
 
<------>err = zlib_deflate(&stream, Z_FINISH);
<------>if (err != Z_STREAM_END)
<------><------>goto error;
 
<------>err = zlib_deflateEnd(&stream);
<------>if (err != Z_OK)
<------><------>goto error;
 
<------>if (stream.total_out >= stream.total_in)
<------><------>goto error;
 
<------>ret = stream.total_out;
error:
<------>return ret;
}
 
/* Compress the text from big_oops_buf into oops_buf. */
static int zip_oops(size_t text_len)
{
<------>struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
<------>int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
<------><------><------><------><------><------><------><------>oops_data_sz);
<------>if (zipped_len < 0) {
<------><------>pr_err("nvram: compression failed; returned %d\n", zipped_len);
<------><------>pr_err("nvram: logging uncompressed oops/panic report\n");
<------><------>return -1;
<------>}
<------>oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
<------>oops_hdr->report_length = cpu_to_be16(zipped_len);
<------>oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
<------>return 0;
}
 
#ifdef CONFIG_PSTORE
static int nvram_pstore_open(struct pstore_info *psi)
{
<------>/* Reset the iterator to start reading partitions again */
<------>read_type = -1;
<------>return 0;
}
 
/**
 * nvram_pstore_write - pstore write callback for nvram
 * @record:             pstore record to write, with @id to be set
 *
 * Called by pstore_dump() when an oops or panic report is logged in the
 * printk buffer.
 * Returns 0 on successful write.
 */
static int nvram_pstore_write(struct pstore_record *record)
{
<------>int rc;
<------>unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
<------>struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
 
<------>/* part 1 has the recent messages from printk buffer */
<------>if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG))
<------><------>return -1;
 
<------>if (clobbering_unread_rtas_event())
<------><------>return -1;
 
<------>oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
<------>oops_hdr->report_length = cpu_to_be16(record->size);
<------>oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
 
<------>if (record->compressed)
<------><------>err_type = ERR_TYPE_KERNEL_PANIC_GZ;
 
<------>rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
<------><------>(int) (sizeof(*oops_hdr) + record->size), err_type,
<------><------>record->count);
 
<------>if (rc != 0)
<------><------>return rc;
 
<------>record->id = record->part;
<------>return 0;
}
 
/*
 * Reads the oops/panic report, rtas, of-config and common partition.
 * Returns the length of the data we read from each partition.
 * Returns 0 if we've been called before.
 */
static ssize_t nvram_pstore_read(struct pstore_record *record)
{
<------>struct oops_log_info *oops_hdr;
<------>unsigned int err_type, id_no, size = 0;
<------>struct nvram_os_partition *part = NULL;
<------>char *buff = NULL;
<------>int sig = 0;
<------>loff_t p;
 
<------>read_type++;
 
<------>switch (nvram_type_ids[read_type]) {
<------>case PSTORE_TYPE_DMESG:
<------><------>part = &oops_log_partition;
<------><------>record->type = PSTORE_TYPE_DMESG;
<------><------>break;
<------>case PSTORE_TYPE_PPC_COMMON:
<------><------>sig = NVRAM_SIG_SYS;
<------><------>part = &common_partition;
<------><------>record->type = PSTORE_TYPE_PPC_COMMON;
<------><------>record->id = PSTORE_TYPE_PPC_COMMON;
<------><------>record->time.tv_sec = 0;
<------><------>record->time.tv_nsec = 0;
<------><------>break;
#ifdef CONFIG_PPC_PSERIES
<------>case PSTORE_TYPE_PPC_RTAS:
<------><------>part = &rtas_log_partition;
<------><------>record->type = PSTORE_TYPE_PPC_RTAS;
<------><------>record->time.tv_sec = last_rtas_event;
<------><------>record->time.tv_nsec = 0;
<------><------>break;
<------>case PSTORE_TYPE_PPC_OF:
<------><------>sig = NVRAM_SIG_OF;
<------><------>part = &of_config_partition;
<------><------>record->type = PSTORE_TYPE_PPC_OF;
<------><------>record->id = PSTORE_TYPE_PPC_OF;
<------><------>record->time.tv_sec = 0;
<------><------>record->time.tv_nsec = 0;
<------><------>break;
#endif
#ifdef CONFIG_PPC_POWERNV
<------>case PSTORE_TYPE_PPC_OPAL:
<------><------>sig = NVRAM_SIG_FW;
<------><------>part = &skiboot_partition;
<------><------>record->type = PSTORE_TYPE_PPC_OPAL;
<------><------>record->id = PSTORE_TYPE_PPC_OPAL;
<------><------>record->time.tv_sec = 0;
<------><------>record->time.tv_nsec = 0;
<------><------>break;
#endif
<------>default:
<------><------>return 0;
<------>}
 
<------>if (!part->os_partition) {
<------><------>p = nvram_find_partition(part->name, sig, &size);
<------><------>if (p <= 0) {
<------><------><------>pr_err("nvram: Failed to find partition %s, "
<------><------><------><------>"err %d\n", part->name, (int)p);
<------><------><------>return 0;
<------><------>}
<------><------>part->index = p;
<------><------>part->size = size;
<------>}
 
<------>buff = kmalloc(part->size, GFP_KERNEL);
 
<------>if (!buff)
<------><------>return -ENOMEM;
 
<------>if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
<------><------>kfree(buff);
<------><------>return 0;
<------>}
 
<------>record->count = 0;
 
<------>if (part->os_partition)
<------><------>record->id = id_no;
 
<------>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_SHUTDOWN:
<------><------>/* 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(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
<------>min_size = ALIGN(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;
}