2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* c 2001 PPC 64 Team, IBM Corp
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* /dev/nvram driver for PPC64
|
|
|
|
*
|
|
|
|
* This perhaps should live in drivers/char
|
|
|
|
*
|
|
|
|
* TODO: Split the /dev/nvram part (that one can use
|
|
|
|
* drivers/char/generic_nvram.c) from the arch & partition
|
|
|
|
* parsing code.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
|
|
|
|
#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 <asm/uaccess.h>
|
|
|
|
#include <asm/nvram.h>
|
|
|
|
#include <asm/rtas.h>
|
|
|
|
#include <asm/prom.h>
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
|
|
|
|
#undef DEBUG_NVRAM
|
|
|
|
|
|
|
|
static int nvram_scan_partitions(void);
|
|
|
|
static int nvram_setup_partition(void);
|
|
|
|
static int nvram_create_os_partition(void);
|
|
|
|
static int nvram_remove_os_partition(void);
|
|
|
|
|
|
|
|
static struct nvram_partition * nvram_part;
|
|
|
|
static long nvram_error_log_index = -1;
|
|
|
|
static long nvram_error_log_size = 0;
|
|
|
|
|
|
|
|
int no_logging = 1; /* Until we initialize everything,
|
|
|
|
* make sure we don't try logging
|
|
|
|
* anything */
|
|
|
|
|
|
|
|
extern volatile int error_log_cnt;
|
|
|
|
|
|
|
|
struct err_log_info {
|
|
|
|
int error_type;
|
|
|
|
unsigned int seq_num;
|
|
|
|
};
|
|
|
|
|
|
|
|
static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
|
|
|
|
{
|
|
|
|
int size;
|
|
|
|
|
|
|
|
if (ppc_md.nvram_size == NULL)
|
|
|
|
return -ENODEV;
|
|
|
|
size = ppc_md.nvram_size();
|
|
|
|
|
|
|
|
switch (origin) {
|
|
|
|
case 1:
|
|
|
|
offset += file->f_pos;
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
offset += size;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (offset < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
file->f_pos = offset;
|
|
|
|
return file->f_pos;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static ssize_t dev_nvram_read(struct file *file, char __user *buf,
|
|
|
|
size_t count, loff_t *ppos)
|
|
|
|
{
|
2005-12-09 19:21:44 +01:00
|
|
|
ssize_t ret;
|
|
|
|
char *tmp = NULL;
|
|
|
|
ssize_t size;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
ret = -ENODEV;
|
|
|
|
if (!ppc_md.nvram_size)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
size = ppc_md.nvram_size();
|
2005-12-09 19:21:44 +01:00
|
|
|
if (*ppos >= size || size < 0)
|
|
|
|
goto out;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
count = min_t(size_t, count, size - *ppos);
|
|
|
|
count = min(count, PAGE_SIZE);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
ret = -ENOMEM;
|
|
|
|
tmp = kmalloc(count, GFP_KERNEL);
|
|
|
|
if (!tmp)
|
|
|
|
goto out;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
ret = ppc_md.nvram_read(tmp, count, ppos);
|
|
|
|
if (ret <= 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (copy_to_user(buf, tmp, ret))
|
|
|
|
ret = -EFAULT;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
out:
|
|
|
|
kfree(tmp);
|
|
|
|
return ret;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
|
2005-12-09 19:21:44 +01:00
|
|
|
size_t count, loff_t *ppos)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2005-12-09 19:21:44 +01:00
|
|
|
ssize_t ret;
|
|
|
|
char *tmp = NULL;
|
|
|
|
ssize_t size;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
ret = -ENODEV;
|
|
|
|
if (!ppc_md.nvram_size)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
size = ppc_md.nvram_size();
|
2005-12-09 19:21:44 +01:00
|
|
|
if (*ppos >= size || size < 0)
|
|
|
|
goto out;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
count = min_t(size_t, count, size - *ppos);
|
|
|
|
count = min(count, PAGE_SIZE);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-09 19:21:44 +01:00
|
|
|
ret = -ENOMEM;
|
|
|
|
tmp = kmalloc(count, GFP_KERNEL);
|
|
|
|
if (!tmp)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = -EFAULT;
|
|
|
|
if (copy_from_user(tmp, buf, count))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = ppc_md.nvram_write(tmp, count, ppos);
|
|
|
|
|
|
|
|
out:
|
|
|
|
kfree(tmp);
|
|
|
|
return ret;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dev_nvram_ioctl(struct inode *inode, struct file *file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
switch(cmd) {
|
|
|
|
#ifdef CONFIG_PPC_PMAC
|
|
|
|
case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
|
|
|
|
printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
|
|
|
|
case IOC_NVRAM_GET_OFFSET: {
|
|
|
|
int part, offset;
|
|
|
|
|
2006-03-28 14:15:54 +02:00
|
|
|
if (!machine_is(powermac))
|
2005-04-17 00:20:36 +02:00
|
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
|
|
|
|
return -EFAULT;
|
|
|
|
if (part < pmac_nvram_OF || part > pmac_nvram_NR)
|
|
|
|
return -EINVAL;
|
|
|
|
offset = pmac_get_partition(part);
|
|
|
|
if (offset < 0)
|
|
|
|
return offset;
|
|
|
|
if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_PPC_PMAC */
|
2006-03-23 07:38:10 +01:00
|
|
|
default:
|
|
|
|
return -EINVAL;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
struct file_operations nvram_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = dev_nvram_llseek,
|
|
|
|
.read = dev_nvram_read,
|
|
|
|
.write = dev_nvram_write,
|
|
|
|
.ioctl = dev_nvram_ioctl,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice nvram_dev = {
|
|
|
|
NVRAM_MINOR,
|
|
|
|
"nvram",
|
|
|
|
&nvram_fops
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef DEBUG_NVRAM
|
|
|
|
static void nvram_print_partitions(char * label)
|
|
|
|
{
|
|
|
|
struct list_head * p;
|
|
|
|
struct nvram_partition * tmp_part;
|
|
|
|
|
|
|
|
printk(KERN_WARNING "--------%s---------\n", label);
|
|
|
|
printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
|
|
|
|
list_for_each(p, &nvram_part->partition) {
|
|
|
|
tmp_part = list_entry(p, struct nvram_partition, partition);
|
|
|
|
printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n",
|
|
|
|
tmp_part->index, tmp_part->header.signature,
|
|
|
|
tmp_part->header.checksum, tmp_part->header.length,
|
|
|
|
tmp_part->header.name);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
static int nvram_write_header(struct nvram_partition * part)
|
|
|
|
{
|
|
|
|
loff_t tmp_index;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
tmp_index = part->index;
|
|
|
|
rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static unsigned char 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find an nvram partition, sig can be 0 for any
|
|
|
|
* partition or name can be NULL for any name, else
|
|
|
|
* tries to match both
|
|
|
|
*/
|
|
|
|
struct nvram_partition *nvram_find_partition(int sig, const char *name)
|
|
|
|
{
|
|
|
|
struct nvram_partition * part;
|
|
|
|
struct list_head * p;
|
|
|
|
|
|
|
|
list_for_each(p, &nvram_part->partition) {
|
|
|
|
part = list_entry(p, struct nvram_partition, partition);
|
|
|
|
|
|
|
|
if (sig && part->header.signature != sig)
|
|
|
|
continue;
|
|
|
|
if (name && 0 != strncmp(name, part->header.name, 12))
|
|
|
|
continue;
|
|
|
|
return part;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(nvram_find_partition);
|
|
|
|
|
|
|
|
|
|
|
|
static int nvram_remove_os_partition(void)
|
|
|
|
{
|
|
|
|
struct list_head *i;
|
|
|
|
struct list_head *j;
|
|
|
|
struct nvram_partition * part;
|
|
|
|
struct nvram_partition * cur_part;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
list_for_each(i, &nvram_part->partition) {
|
|
|
|
part = list_entry(i, struct nvram_partition, partition);
|
|
|
|
if (part->header.signature != NVRAM_SIG_OS)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
/* Make os partition a free partition */
|
|
|
|
part->header.signature = NVRAM_SIG_FREE;
|
|
|
|
sprintf(part->header.name, "wwwwwwwwwwww");
|
|
|
|
part->header.checksum = nvram_checksum(&part->header);
|
|
|
|
|
|
|
|
/* Merge contiguous free partitions backwards */
|
|
|
|
list_for_each_prev(j, &part->partition) {
|
|
|
|
cur_part = list_entry(j, struct nvram_partition, partition);
|
|
|
|
if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
part->header.length += cur_part->header.length;
|
|
|
|
part->header.checksum = nvram_checksum(&part->header);
|
|
|
|
part->index = cur_part->index;
|
|
|
|
|
|
|
|
list_del(&cur_part->partition);
|
|
|
|
kfree(cur_part);
|
|
|
|
j = &part->partition; /* fixup our loop */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Merge contiguous free partitions forwards */
|
|
|
|
list_for_each(j, &part->partition) {
|
|
|
|
cur_part = list_entry(j, struct nvram_partition, partition);
|
|
|
|
if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
part->header.length += cur_part->header.length;
|
|
|
|
part->header.checksum = nvram_checksum(&part->header);
|
|
|
|
|
|
|
|
list_del(&cur_part->partition);
|
|
|
|
kfree(cur_part);
|
|
|
|
j = &part->partition; /* fixup our loop */
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = nvram_write_header(part);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* nvram_create_os_partition
|
|
|
|
*
|
|
|
|
* Create a OS linux partition to buffer error logs.
|
|
|
|
* Will create a partition starting at the first free
|
|
|
|
* space found if space has enough room.
|
|
|
|
*/
|
|
|
|
static int nvram_create_os_partition(void)
|
|
|
|
{
|
2005-06-28 12:33:49 +02:00
|
|
|
struct nvram_partition *part;
|
|
|
|
struct nvram_partition *new_part;
|
2005-05-01 17:58:44 +02:00
|
|
|
struct nvram_partition *free_part = NULL;
|
2005-04-17 00:20:36 +02:00
|
|
|
int seq_init[2] = { 0, 0 };
|
|
|
|
loff_t tmp_index;
|
|
|
|
long size = 0;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* 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 */
|
2005-06-28 12:33:49 +02:00
|
|
|
list_for_each_entry(part, &nvram_part->partition, partition) {
|
2005-04-17 00:20:36 +02:00
|
|
|
if (part->header.signature != NVRAM_SIG_FREE)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (part->header.length >= NVRAM_MAX_REQ) {
|
|
|
|
size = NVRAM_MAX_REQ;
|
|
|
|
free_part = part;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!size && part->header.length >= NVRAM_MIN_REQ) {
|
|
|
|
size = NVRAM_MIN_REQ;
|
|
|
|
free_part = part;
|
|
|
|
}
|
|
|
|
}
|
2005-05-01 17:58:44 +02:00
|
|
|
if (!size)
|
2005-04-17 00:20:36 +02:00
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
/* Create our OS partition */
|
2005-05-01 17:58:44 +02:00
|
|
|
new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!new_part) {
|
|
|
|
printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_part->index = free_part->index;
|
|
|
|
new_part->header.signature = NVRAM_SIG_OS;
|
|
|
|
new_part->header.length = size;
|
2005-05-01 17:58:44 +02:00
|
|
|
strcpy(new_part->header.name, "ppc64,linux");
|
2005-04-17 00:20:36 +02:00
|
|
|
new_part->header.checksum = nvram_checksum(&new_part->header);
|
|
|
|
|
|
|
|
rc = nvram_write_header(new_part);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_create_os_partition: nvram_write_header \
|
|
|
|
failed (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* make sure and initialize to zero the sequence number and the error
|
|
|
|
type logged */
|
|
|
|
tmp_index = new_part->index + NVRAM_HEADER_LEN;
|
|
|
|
rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
|
|
|
|
if (rc <= 0) {
|
2005-05-01 17:58:44 +02:00
|
|
|
printk(KERN_ERR "nvram_create_os_partition: nvram_write "
|
|
|
|
"failed (%d)\n", rc);
|
2005-04-17 00:20:36 +02:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
|
|
|
|
nvram_error_log_size = ((part->header.length - 1) *
|
|
|
|
NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
|
|
|
|
|
|
|
|
list_add_tail(&new_part->partition, &free_part->partition);
|
|
|
|
|
|
|
|
if (free_part->header.length <= size) {
|
|
|
|
list_del(&free_part->partition);
|
|
|
|
kfree(free_part);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Adjust the partition we stole the space from */
|
|
|
|
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) {
|
|
|
|
printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
|
|
|
|
"failed (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* nvram_setup_partition
|
|
|
|
*
|
|
|
|
* This will setup the partition we need for buffering the
|
|
|
|
* error logs and cleanup partitions if needed.
|
|
|
|
*
|
|
|
|
* The general strategy is the following:
|
|
|
|
* 1.) If there is ppc64,linux partition large enough then use it.
|
|
|
|
* 2.) If there is not a ppc64,linux partition large enough, search
|
|
|
|
* for a free partition that is large enough.
|
|
|
|
* 3.) If there is not a free partition large enough remove
|
|
|
|
* _all_ OS partitions and consolidate the space.
|
|
|
|
* 4.) Will first try getting a chunk that will satisfy the maximum
|
|
|
|
* error log size (NVRAM_MAX_REQ).
|
|
|
|
* 5.) If the max chunk cannot be allocated then try finding a chunk
|
|
|
|
* that will satisfy the minum needed (NVRAM_MIN_REQ).
|
|
|
|
*/
|
|
|
|
static int nvram_setup_partition(void)
|
|
|
|
{
|
|
|
|
struct list_head * p;
|
|
|
|
struct nvram_partition * part;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* For now, we don't do any of this on pmac, until I
|
|
|
|
* have figured out if it's worth killing some unused stuffs
|
|
|
|
* in our nvram, as Apple defined partitions use pretty much
|
|
|
|
* all of the space
|
|
|
|
*/
|
2006-03-28 14:15:54 +02:00
|
|
|
if (machine_is(powermac))
|
2005-04-17 00:20:36 +02:00
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
/* see if we have an OS partition that meets our needs.
|
|
|
|
will try getting the max we need. If not we'll delete
|
|
|
|
partitions and try again. */
|
|
|
|
list_for_each(p, &nvram_part->partition) {
|
|
|
|
part = list_entry(p, struct nvram_partition, partition);
|
|
|
|
if (part->header.signature != NVRAM_SIG_OS)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (strcmp(part->header.name, "ppc64,linux"))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (part->header.length >= NVRAM_MIN_REQ) {
|
|
|
|
/* found our partition */
|
|
|
|
nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
|
|
|
|
nvram_error_log_size = ((part->header.length - 1) *
|
|
|
|
NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* try creating a partition with the free space we have */
|
|
|
|
rc = nvram_create_os_partition();
|
|
|
|
if (!rc) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* need to free up some space */
|
|
|
|
rc = nvram_remove_os_partition();
|
|
|
|
if (rc) {
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* create a partition in this new space */
|
|
|
|
rc = nvram_create_os_partition();
|
|
|
|
if (rc) {
|
|
|
|
printk(KERN_ERR "nvram_create_os_partition: Could not find a "
|
|
|
|
"NVRAM partition large enough\n");
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int 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)
|
|
|
|
return -ENODEV;
|
|
|
|
total_size = ppc_md.nvram_size();
|
|
|
|
|
|
|
|
header = (char *) 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);
|
|
|
|
|
|
|
|
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 = (struct nvram_partition *)
|
|
|
|
kmalloc(sizeof(struct nvram_partition), 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_part->partition);
|
|
|
|
|
|
|
|
cur_index += phead.length * NVRAM_BLOCK_LEN;
|
|
|
|
}
|
|
|
|
err = 0;
|
|
|
|
|
|
|
|
out:
|
|
|
|
kfree(header);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init nvram_init(void)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
rc = misc_register(&nvram_dev);
|
|
|
|
if (rc != 0) {
|
|
|
|
printk(KERN_ERR "nvram_init: failed to register device\n");
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* initialize our anchor for the nvram partition list */
|
|
|
|
nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
|
|
|
|
if (!nvram_part) {
|
|
|
|
printk(KERN_ERR "nvram_init: Failed kmalloc\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
INIT_LIST_HEAD(&nvram_part->partition);
|
|
|
|
|
|
|
|
/* Get all the NVRAM partitions */
|
|
|
|
error = nvram_scan_partitions();
|
|
|
|
if (error) {
|
|
|
|
printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n");
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(nvram_setup_partition())
|
|
|
|
printk(KERN_WARNING "nvram_init: Could not find nvram partition"
|
|
|
|
" for nvram buffered error logging.\n");
|
|
|
|
|
|
|
|
#ifdef DEBUG_NVRAM
|
|
|
|
nvram_print_partitions("NVRAM Partitions");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
void __exit nvram_cleanup(void)
|
|
|
|
{
|
|
|
|
misc_deregister( &nvram_dev );
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
|
|
|
|
|
|
/* nvram_write_error_log
|
|
|
|
*
|
|
|
|
* 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 nvram_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_error_log(char * buff, int length, unsigned int err_type)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
loff_t tmp_index;
|
|
|
|
struct err_log_info info;
|
|
|
|
|
|
|
|
if (no_logging) {
|
|
|
|
return -EPERM;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (nvram_error_log_index == -1) {
|
|
|
|
return -ESPIPE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (length > nvram_error_log_size) {
|
|
|
|
length = nvram_error_log_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
info.error_type = err_type;
|
|
|
|
info.seq_num = error_log_cnt;
|
|
|
|
|
|
|
|
tmp_index = nvram_error_log_index;
|
|
|
|
|
|
|
|
rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = ppc_md.nvram_write(buff, length, &tmp_index);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* nvram_read_error_log
|
|
|
|
*
|
|
|
|
* Reads nvram for error log for at most 'length'
|
|
|
|
*/
|
|
|
|
int nvram_read_error_log(char * buff, int length, unsigned int * err_type)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
loff_t tmp_index;
|
|
|
|
struct err_log_info info;
|
|
|
|
|
|
|
|
if (nvram_error_log_index == -1)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
if (length > nvram_error_log_size)
|
|
|
|
length = nvram_error_log_size;
|
|
|
|
|
|
|
|
tmp_index = nvram_error_log_index;
|
|
|
|
|
|
|
|
rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = ppc_md.nvram_read(buff, length, &tmp_index);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
error_log_cnt = info.seq_num;
|
|
|
|
*err_type = info.error_type;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* This doesn't actually zero anything, but it sets the event_logged
|
|
|
|
* word to tell that this event is safely in syslog.
|
|
|
|
*/
|
|
|
|
int nvram_clear_error_log(void)
|
|
|
|
{
|
|
|
|
loff_t tmp_index;
|
|
|
|
int clear_word = ERR_FLAG_ALREADY_LOGGED;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
tmp_index = nvram_error_log_index;
|
|
|
|
|
|
|
|
rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
|
|
|
|
if (rc <= 0) {
|
|
|
|
printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_PPC_PSERIES */
|
|
|
|
|
|
|
|
module_init(nvram_init);
|
|
|
|
module_exit(nvram_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|