diff options
Diffstat (limited to 'arch/ppc64/kernel/nvram.c')
| -rw-r--r-- | arch/ppc64/kernel/nvram.c | 742 |
1 files changed, 0 insertions, 742 deletions
diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c deleted file mode 100644 index c0fcd29918c..00000000000 --- a/arch/ppc64/kernel/nvram.c +++ /dev/null @@ -1,742 +0,0 @@ -/* - * 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) -{ - ssize_t len; - char *tmp_buffer; - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - if (!access_ok(VERIFY_WRITE, buf, count)) - return -EFAULT; - if (*ppos >= size) - return 0; - if (count > size) - count = size; - - tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); - if (!tmp_buffer) { - printk(KERN_ERR "dev_read_nvram: kmalloc failed\n"); - return -ENOMEM; - } - - len = ppc_md.nvram_read(tmp_buffer, count, ppos); - if ((long)len <= 0) { - kfree(tmp_buffer); - return len; - } - - if (copy_to_user(buf, tmp_buffer, len)) { - kfree(tmp_buffer); - return -EFAULT; - } - - kfree(tmp_buffer); - return len; - -} - -static ssize_t dev_nvram_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - ssize_t len; - char * tmp_buffer; - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - if (!access_ok(VERIFY_READ, buf, count)) - return -EFAULT; - if (*ppos >= size) - return 0; - if (count > size) - count = size; - - tmp_buffer = (char *) kmalloc(count, GFP_KERNEL); - if (!tmp_buffer) { - printk(KERN_ERR "dev_nvram_write: kmalloc failed\n"); - return -ENOMEM; - } - - if (copy_from_user(tmp_buffer, buf, count)) { - kfree(tmp_buffer); - return -EFAULT; - } - - len = ppc_md.nvram_write(tmp_buffer, count, ppos); - if ((long)len <= 0) { - kfree(tmp_buffer); - return len; - } - - kfree(tmp_buffer); - return len; -} - -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; - - if (_machine != PLATFORM_POWERMAC) - 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 */ - } - return -EINVAL; -} - -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) -{ - struct nvram_partition *part; - struct nvram_partition *new_part; - struct nvram_partition *free_part = NULL; - 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 */ - list_for_each_entry(part, &nvram_part->partition, partition) { - 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; - } - } - if (!size) - return -ENOSPC; - - /* Create our OS partition */ - new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); - 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; - strcpy(new_part->header.name, "ppc64,linux"); - 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) { - printk(KERN_ERR "nvram_create_os_partition: nvram_write " - "failed (%d)\n", rc); - 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 - */ - if (_machine == PLATFORM_POWERMAC) - 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"); |