diff options
Diffstat (limited to 'arch/ppc64/kernel/scanlog.c')
| -rw-r--r-- | arch/ppc64/kernel/scanlog.c | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/arch/ppc64/kernel/scanlog.c b/arch/ppc64/kernel/scanlog.c deleted file mode 100644 index 2edc947f7c44..000000000000 --- a/arch/ppc64/kernel/scanlog.c +++ /dev/null @@ -1,235 +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. - * - * scan-log-data driver for PPC64 Todd Inglett <tinglett@vnet.ibm.com> - * - * When ppc64 hardware fails the service processor dumps internal state - * of the system. After a reboot the operating system can access a dump - * of this data using this driver. A dump exists if the device-tree - * /chosen/ibm,scan-log-data property exists. - * - * This driver exports /proc/ppc64/scan-log-dump which can be read. - * The driver supports only sequential reads. - * - * The driver looks at a write to the driver for the single word "reset". - * If given, the driver will reset the scanlog so the platform can free it. - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/proc_fs.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <asm/uaccess.h> -#include <asm/rtas.h> -#include <asm/prom.h> - -#define MODULE_VERS "1.0" -#define MODULE_NAME "scanlog" - -/* Status returns from ibm,scan-log-dump */ -#define SCANLOG_COMPLETE 0 -#define SCANLOG_HWERROR -1 -#define SCANLOG_CONTINUE 1 - -#define DEBUG(A...) do { if (scanlog_debug) printk(KERN_ERR "scanlog: " A); } while (0) - -static int scanlog_debug; -static unsigned int ibm_scan_log_dump; /* RTAS token */ -static struct proc_dir_entry *proc_ppc64_scan_log_dump; /* The proc file */ - -static ssize_t scanlog_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - struct inode * inode = file->f_dentry->d_inode; - struct proc_dir_entry *dp; - unsigned int *data; - int status; - unsigned long len, off; - unsigned int wait_time; - - dp = PDE(inode); - data = (unsigned int *)dp->data; - - if (!data) { - printk(KERN_ERR "scanlog: read failed no data\n"); - return -EIO; - } - - if (count > RTAS_DATA_BUF_SIZE) - count = RTAS_DATA_BUF_SIZE; - - if (count < 1024) { - /* This is the min supported by this RTAS call. Rather - * than do all the buffering we insist the user code handle - * larger reads. As long as cp works... :) - */ - printk(KERN_ERR "scanlog: cannot perform a small read (%ld)\n", count); - return -EINVAL; - } - - if (!access_ok(VERIFY_WRITE, buf, count)) - return -EFAULT; - - for (;;) { - wait_time = 500; /* default wait if no data */ - spin_lock(&rtas_data_buf_lock); - memcpy(rtas_data_buf, data, RTAS_DATA_BUF_SIZE); - status = rtas_call(ibm_scan_log_dump, 2, 1, NULL, - (u32) __pa(rtas_data_buf), (u32) count); - memcpy(data, rtas_data_buf, RTAS_DATA_BUF_SIZE); - spin_unlock(&rtas_data_buf_lock); - - DEBUG("status=%d, data[0]=%x, data[1]=%x, data[2]=%x\n", - status, data[0], data[1], data[2]); - switch (status) { - case SCANLOG_COMPLETE: - DEBUG("hit eof\n"); - return 0; - case SCANLOG_HWERROR: - DEBUG("hardware error reading scan log data\n"); - return -EIO; - case SCANLOG_CONTINUE: - /* We may or may not have data yet */ - len = data[1]; - off = data[2]; - if (len > 0) { - if (copy_to_user(buf, ((char *)data)+off, len)) - return -EFAULT; - return len; - } - /* Break to sleep default time */ - break; - default: - if (status > 9900 && status <= 9905) { - wait_time = rtas_extended_busy_delay_time(status); - } else { - printk(KERN_ERR "scanlog: unknown error from rtas: %d\n", status); - return -EIO; - } - } - /* Apparently no data yet. Wait and try again. */ - msleep_interruptible(wait_time); - } - /*NOTREACHED*/ -} - -static ssize_t scanlog_write(struct file * file, const char __user * buf, - size_t count, loff_t *ppos) -{ - char stkbuf[20]; - int status; - - if (count > 19) count = 19; - if (copy_from_user (stkbuf, buf, count)) { - return -EFAULT; - } - stkbuf[count] = 0; - - if (buf) { - if (strncmp(stkbuf, "reset", 5) == 0) { - DEBUG("reset scanlog\n"); - status = rtas_call(ibm_scan_log_dump, 2, 1, NULL, 0, 0); - DEBUG("rtas returns %d\n", status); - } else if (strncmp(stkbuf, "debugon", 7) == 0) { - printk(KERN_ERR "scanlog: debug on\n"); - scanlog_debug = 1; - } else if (strncmp(stkbuf, "debugoff", 8) == 0) { - printk(KERN_ERR "scanlog: debug off\n"); - scanlog_debug = 0; - } - } - return count; -} - -static int scanlog_open(struct inode * inode, struct file * file) -{ - struct proc_dir_entry *dp = PDE(inode); - unsigned int *data = (unsigned int *)dp->data; - - if (!data) { - printk(KERN_ERR "scanlog: open failed no data\n"); - return -EIO; - } - - if (data[0] != 0) { - /* This imperfect test stops a second copy of the - * data (or a reset while data is being copied) - */ - return -EBUSY; - } - - data[0] = 0; /* re-init so we restart the scan */ - - return 0; -} - -static int scanlog_release(struct inode * inode, struct file * file) -{ - struct proc_dir_entry *dp = PDE(inode); - unsigned int *data = (unsigned int *)dp->data; - - if (!data) { - printk(KERN_ERR "scanlog: release failed no data\n"); - return -EIO; - } - data[0] = 0; - - return 0; -} - -struct file_operations scanlog_fops = { - .owner = THIS_MODULE, - .read = scanlog_read, - .write = scanlog_write, - .open = scanlog_open, - .release = scanlog_release, -}; - -int __init scanlog_init(void) -{ - struct proc_dir_entry *ent; - - ibm_scan_log_dump = rtas_token("ibm,scan-log-dump"); - if (ibm_scan_log_dump == RTAS_UNKNOWN_SERVICE) { - printk(KERN_ERR "scan-log-dump not implemented on this system\n"); - return -EIO; - } - - ent = create_proc_entry("ppc64/rtas/scan-log-dump", S_IRUSR, NULL); - if (ent) { - ent->proc_fops = &scanlog_fops; - /* Ideally we could allocate a buffer < 4G */ - ent->data = kmalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); - if (!ent->data) { - printk(KERN_ERR "Failed to allocate a buffer\n"); - remove_proc_entry("scan-log-dump", ent->parent); - return -ENOMEM; - } - ((unsigned int *)ent->data)[0] = 0; - } else { - printk(KERN_ERR "Failed to create ppc64/scan-log-dump proc entry\n"); - return -EIO; - } - proc_ppc64_scan_log_dump = ent; - - return 0; -} - -void __exit scanlog_cleanup(void) -{ - if (proc_ppc64_scan_log_dump) { - kfree(proc_ppc64_scan_log_dump->data); - remove_proc_entry("scan-log-dump", proc_ppc64_scan_log_dump->parent); - } -} - -module_init(scanlog_init); -module_exit(scanlog_cleanup); -MODULE_LICENSE("GPL"); |