Len Brown
15 years ago
commit
feb29c5175
@ -1,5 +1,6 @@ |
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obj-$(CONFIG_ACPI_APEI) += apei.o
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obj-$(CONFIG_ACPI_APEI_GHES) += ghes.o
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obj-$(CONFIG_ACPI_APEI_EINJ) += einj.o
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obj-$(CONFIG_ACPI_APEI_ERST_DEBUG) += erst-dbg.o
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apei-y := apei-base.o hest.o cper.o erst.o
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@ -0,0 +1,207 @@ |
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/*
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* APEI Error Record Serialization Table debug support |
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* |
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* ERST is a way provided by APEI to save and retrieve hardware error |
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* infomation to and from a persistent store. This file provide the |
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* debugging/testing support for ERST kernel support and firmware |
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* implementation. |
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* |
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* Copyright 2010 Intel Corp. |
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* Author: Huang Ying <ying.huang@intel.com> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version |
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* 2 as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/uaccess.h> |
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#include <acpi/apei.h> |
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#include <linux/miscdevice.h> |
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#include "apei-internal.h" |
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#define ERST_DBG_PFX "ERST DBG: " |
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#define ERST_DBG_RECORD_LEN_MAX 4096 |
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static void *erst_dbg_buf; |
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static unsigned int erst_dbg_buf_len; |
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/* Prevent erst_dbg_read/write from being invoked concurrently */ |
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static DEFINE_MUTEX(erst_dbg_mutex); |
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static int erst_dbg_open(struct inode *inode, struct file *file) |
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{ |
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if (erst_disable) |
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return -ENODEV; |
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return nonseekable_open(inode, file); |
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} |
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static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
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{ |
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int rc; |
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u64 record_id; |
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u32 record_count; |
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switch (cmd) { |
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case APEI_ERST_CLEAR_RECORD: |
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rc = copy_from_user(&record_id, (void __user *)arg, |
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sizeof(record_id)); |
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if (rc) |
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return -EFAULT; |
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return erst_clear(record_id); |
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case APEI_ERST_GET_RECORD_COUNT: |
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rc = erst_get_record_count(); |
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if (rc < 0) |
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return rc; |
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record_count = rc; |
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rc = put_user(record_count, (u32 __user *)arg); |
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if (rc) |
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return rc; |
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return 0; |
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default: |
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return -ENOTTY; |
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} |
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} |
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static ssize_t erst_dbg_read(struct file *filp, char __user *ubuf, |
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size_t usize, loff_t *off) |
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{ |
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int rc; |
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ssize_t len = 0; |
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u64 id; |
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if (*off != 0) |
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return -EINVAL; |
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if (mutex_lock_interruptible(&erst_dbg_mutex) != 0) |
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return -EINTR; |
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retry_next: |
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rc = erst_get_next_record_id(&id); |
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if (rc) |
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goto out; |
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/* no more record */ |
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if (id == APEI_ERST_INVALID_RECORD_ID) |
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goto out; |
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retry: |
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rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len); |
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/* The record may be cleared by others, try read next record */ |
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if (rc == -ENOENT) |
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goto retry_next; |
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if (rc < 0) |
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goto out; |
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if (len > ERST_DBG_RECORD_LEN_MAX) { |
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pr_warning(ERST_DBG_PFX |
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"Record (ID: 0x%llx) length is too long: %zd\n", |
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id, len); |
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rc = -EIO; |
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goto out; |
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} |
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if (len > erst_dbg_buf_len) { |
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kfree(erst_dbg_buf); |
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rc = -ENOMEM; |
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erst_dbg_buf = kmalloc(len, GFP_KERNEL); |
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if (!erst_dbg_buf) |
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goto out; |
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erst_dbg_buf_len = len; |
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goto retry; |
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} |
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rc = -EINVAL; |
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if (len > usize) |
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goto out; |
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rc = -EFAULT; |
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if (copy_to_user(ubuf, erst_dbg_buf, len)) |
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goto out; |
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rc = 0; |
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out: |
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mutex_unlock(&erst_dbg_mutex); |
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return rc ? rc : len; |
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} |
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static ssize_t erst_dbg_write(struct file *filp, const char __user *ubuf, |
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size_t usize, loff_t *off) |
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{ |
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int rc; |
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struct cper_record_header *rcd; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (usize > ERST_DBG_RECORD_LEN_MAX) { |
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pr_err(ERST_DBG_PFX "Too long record to be written\n"); |
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return -EINVAL; |
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} |
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if (mutex_lock_interruptible(&erst_dbg_mutex)) |
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return -EINTR; |
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if (usize > erst_dbg_buf_len) { |
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kfree(erst_dbg_buf); |
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rc = -ENOMEM; |
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erst_dbg_buf = kmalloc(usize, GFP_KERNEL); |
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if (!erst_dbg_buf) |
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goto out; |
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erst_dbg_buf_len = usize; |
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} |
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rc = copy_from_user(erst_dbg_buf, ubuf, usize); |
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if (rc) { |
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rc = -EFAULT; |
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goto out; |
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} |
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rcd = erst_dbg_buf; |
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rc = -EINVAL; |
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if (rcd->record_length != usize) |
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goto out; |
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rc = erst_write(erst_dbg_buf); |
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out: |
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mutex_unlock(&erst_dbg_mutex); |
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return rc < 0 ? rc : usize; |
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} |
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static const struct file_operations erst_dbg_ops = { |
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.owner = THIS_MODULE, |
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.open = erst_dbg_open, |
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.read = erst_dbg_read, |
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.write = erst_dbg_write, |
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.unlocked_ioctl = erst_dbg_ioctl, |
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}; |
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static struct miscdevice erst_dbg_dev = { |
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.minor = MISC_DYNAMIC_MINOR, |
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.name = "erst_dbg", |
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.fops = &erst_dbg_ops, |
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}; |
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static __init int erst_dbg_init(void) |
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{ |
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return misc_register(&erst_dbg_dev); |
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} |
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static __exit void erst_dbg_exit(void) |
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{ |
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misc_deregister(&erst_dbg_dev); |
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kfree(erst_dbg_buf); |
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} |
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module_init(erst_dbg_init); |
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module_exit(erst_dbg_exit); |
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MODULE_AUTHOR("Huang Ying"); |
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MODULE_DESCRIPTION("APEI Error Record Serialization Table debug support"); |
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MODULE_LICENSE("GPL"); |
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