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![Jan Beulich](/assets/img/avatar_default.png)
This is to augment commit 3f5a7896a5
("x86/mce: Include the PPIN in MCE
records when available").
I'm also adding "synd" and "ipid" fields to struct xen_mce, in an
attempt to keep field offsets in sync with struct mce. These two fields
won't get populated for now, though.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
427 lines
10 KiB
C
427 lines
10 KiB
C
/******************************************************************************
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* mcelog.c
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* Driver for receiving and transferring machine check error infomation
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*
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* Copyright (c) 2012 Intel Corporation
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* Author: Liu, Jinsong <jinsong.liu@intel.com>
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* Author: Jiang, Yunhong <yunhong.jiang@intel.com>
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* Author: Ke, Liping <liping.ke@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 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#define pr_fmt(fmt) "xen_mcelog: " fmt
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <linux/capability.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <xen/interface/xen.h>
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#include <xen/events.h>
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#include <xen/interface/vcpu.h>
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#include <xen/xen.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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static struct mc_info g_mi;
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static struct mcinfo_logical_cpu *g_physinfo;
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static uint32_t ncpus;
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static DEFINE_MUTEX(mcelog_lock);
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static struct xen_mce_log xen_mcelog = {
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.signature = XEN_MCE_LOG_SIGNATURE,
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.len = XEN_MCE_LOG_LEN,
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.recordlen = sizeof(struct xen_mce),
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};
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static DEFINE_SPINLOCK(xen_mce_chrdev_state_lock);
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static int xen_mce_chrdev_open_count; /* #times opened */
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static int xen_mce_chrdev_open_exclu; /* already open exclusive? */
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static DECLARE_WAIT_QUEUE_HEAD(xen_mce_chrdev_wait);
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static int xen_mce_chrdev_open(struct inode *inode, struct file *file)
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{
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spin_lock(&xen_mce_chrdev_state_lock);
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if (xen_mce_chrdev_open_exclu ||
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(xen_mce_chrdev_open_count && (file->f_flags & O_EXCL))) {
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spin_unlock(&xen_mce_chrdev_state_lock);
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return -EBUSY;
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}
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if (file->f_flags & O_EXCL)
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xen_mce_chrdev_open_exclu = 1;
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xen_mce_chrdev_open_count++;
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spin_unlock(&xen_mce_chrdev_state_lock);
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return nonseekable_open(inode, file);
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}
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static int xen_mce_chrdev_release(struct inode *inode, struct file *file)
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{
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spin_lock(&xen_mce_chrdev_state_lock);
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xen_mce_chrdev_open_count--;
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xen_mce_chrdev_open_exclu = 0;
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spin_unlock(&xen_mce_chrdev_state_lock);
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return 0;
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}
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static ssize_t xen_mce_chrdev_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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char __user *buf = ubuf;
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unsigned num;
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int i, err;
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mutex_lock(&mcelog_lock);
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num = xen_mcelog.next;
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/* Only supports full reads right now */
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err = -EINVAL;
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if (*off != 0 || usize < XEN_MCE_LOG_LEN*sizeof(struct xen_mce))
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goto out;
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err = 0;
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for (i = 0; i < num; i++) {
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struct xen_mce *m = &xen_mcelog.entry[i];
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err |= copy_to_user(buf, m, sizeof(*m));
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buf += sizeof(*m);
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}
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memset(xen_mcelog.entry, 0, num * sizeof(struct xen_mce));
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xen_mcelog.next = 0;
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if (err)
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err = -EFAULT;
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out:
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mutex_unlock(&mcelog_lock);
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return err ? err : buf - ubuf;
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}
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static __poll_t xen_mce_chrdev_poll(struct file *file, poll_table *wait)
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{
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poll_wait(file, &xen_mce_chrdev_wait, wait);
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if (xen_mcelog.next)
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return EPOLLIN | EPOLLRDNORM;
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return 0;
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}
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static long xen_mce_chrdev_ioctl(struct file *f, unsigned int cmd,
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unsigned long arg)
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{
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int __user *p = (int __user *)arg;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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switch (cmd) {
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case MCE_GET_RECORD_LEN:
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return put_user(sizeof(struct xen_mce), p);
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case MCE_GET_LOG_LEN:
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return put_user(XEN_MCE_LOG_LEN, p);
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case MCE_GETCLEAR_FLAGS: {
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unsigned flags;
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do {
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flags = xen_mcelog.flags;
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} while (cmpxchg(&xen_mcelog.flags, flags, 0) != flags);
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return put_user(flags, p);
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}
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default:
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return -ENOTTY;
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}
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}
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static const struct file_operations xen_mce_chrdev_ops = {
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.open = xen_mce_chrdev_open,
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.release = xen_mce_chrdev_release,
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.read = xen_mce_chrdev_read,
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.poll = xen_mce_chrdev_poll,
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.unlocked_ioctl = xen_mce_chrdev_ioctl,
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.llseek = no_llseek,
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};
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static struct miscdevice xen_mce_chrdev_device = {
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MISC_MCELOG_MINOR,
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"mcelog",
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&xen_mce_chrdev_ops,
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};
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/*
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* Caller should hold the mcelog_lock
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*/
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static void xen_mce_log(struct xen_mce *mce)
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{
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unsigned entry;
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entry = xen_mcelog.next;
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/*
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* When the buffer fills up discard new entries.
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* Assume that the earlier errors are the more
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* interesting ones:
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*/
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if (entry >= XEN_MCE_LOG_LEN) {
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set_bit(XEN_MCE_OVERFLOW,
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(unsigned long *)&xen_mcelog.flags);
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return;
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}
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memcpy(xen_mcelog.entry + entry, mce, sizeof(struct xen_mce));
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xen_mcelog.next++;
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}
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static int convert_log(struct mc_info *mi)
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{
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struct mcinfo_common *mic;
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struct mcinfo_global *mc_global;
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struct mcinfo_bank *mc_bank;
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struct xen_mce m;
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unsigned int i, j;
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mic = NULL;
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x86_mcinfo_lookup(&mic, mi, MC_TYPE_GLOBAL);
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if (unlikely(!mic)) {
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pr_warn("Failed to find global error info\n");
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return -ENODEV;
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}
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memset(&m, 0, sizeof(struct xen_mce));
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mc_global = (struct mcinfo_global *)mic;
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m.mcgstatus = mc_global->mc_gstatus;
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m.apicid = mc_global->mc_apicid;
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for (i = 0; i < ncpus; i++)
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if (g_physinfo[i].mc_apicid == m.apicid)
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break;
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if (unlikely(i == ncpus)) {
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pr_warn("Failed to match cpu with apicid %d\n", m.apicid);
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return -ENODEV;
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}
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m.socketid = g_physinfo[i].mc_chipid;
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m.cpu = m.extcpu = g_physinfo[i].mc_cpunr;
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m.cpuvendor = (__u8)g_physinfo[i].mc_vendor;
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for (j = 0; j < g_physinfo[i].mc_nmsrvals; ++j)
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switch (g_physinfo[i].mc_msrvalues[j].reg) {
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case MSR_IA32_MCG_CAP:
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m.mcgcap = g_physinfo[i].mc_msrvalues[j].value;
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break;
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case MSR_PPIN:
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case MSR_AMD_PPIN:
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m.ppin = g_physinfo[i].mc_msrvalues[j].value;
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break;
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}
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mic = NULL;
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x86_mcinfo_lookup(&mic, mi, MC_TYPE_BANK);
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if (unlikely(!mic)) {
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pr_warn("Fail to find bank error info\n");
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return -ENODEV;
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}
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do {
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if ((!mic) || (mic->size == 0) ||
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(mic->type != MC_TYPE_GLOBAL &&
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mic->type != MC_TYPE_BANK &&
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mic->type != MC_TYPE_EXTENDED &&
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mic->type != MC_TYPE_RECOVERY))
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break;
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if (mic->type == MC_TYPE_BANK) {
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mc_bank = (struct mcinfo_bank *)mic;
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m.misc = mc_bank->mc_misc;
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m.status = mc_bank->mc_status;
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m.addr = mc_bank->mc_addr;
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m.tsc = mc_bank->mc_tsc;
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m.bank = mc_bank->mc_bank;
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m.finished = 1;
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/*log this record*/
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xen_mce_log(&m);
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}
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mic = x86_mcinfo_next(mic);
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} while (1);
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return 0;
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}
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static int mc_queue_handle(uint32_t flags)
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{
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struct xen_mc mc_op;
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int ret = 0;
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mc_op.cmd = XEN_MC_fetch;
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set_xen_guest_handle(mc_op.u.mc_fetch.data, &g_mi);
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do {
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mc_op.u.mc_fetch.flags = flags;
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ret = HYPERVISOR_mca(&mc_op);
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if (ret) {
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pr_err("Failed to fetch %surgent error log\n",
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flags == XEN_MC_URGENT ? "" : "non");
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break;
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}
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if (mc_op.u.mc_fetch.flags & XEN_MC_NODATA ||
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mc_op.u.mc_fetch.flags & XEN_MC_FETCHFAILED)
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break;
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else {
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ret = convert_log(&g_mi);
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if (ret)
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pr_warn("Failed to convert this error log, continue acking it anyway\n");
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mc_op.u.mc_fetch.flags = flags | XEN_MC_ACK;
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ret = HYPERVISOR_mca(&mc_op);
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if (ret) {
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pr_err("Failed to ack previous error log\n");
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break;
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}
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}
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} while (1);
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return ret;
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}
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/* virq handler for machine check error info*/
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static void xen_mce_work_fn(struct work_struct *work)
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{
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int err;
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mutex_lock(&mcelog_lock);
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/* urgent mc_info */
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err = mc_queue_handle(XEN_MC_URGENT);
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if (err)
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pr_err("Failed to handle urgent mc_info queue, continue handling nonurgent mc_info queue anyway\n");
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/* nonurgent mc_info */
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err = mc_queue_handle(XEN_MC_NONURGENT);
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if (err)
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pr_err("Failed to handle nonurgent mc_info queue\n");
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/* wake processes polling /dev/mcelog */
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wake_up_interruptible(&xen_mce_chrdev_wait);
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mutex_unlock(&mcelog_lock);
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}
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static DECLARE_WORK(xen_mce_work, xen_mce_work_fn);
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static irqreturn_t xen_mce_interrupt(int irq, void *dev_id)
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{
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schedule_work(&xen_mce_work);
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return IRQ_HANDLED;
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}
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static int bind_virq_for_mce(void)
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{
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int ret;
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struct xen_mc mc_op;
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memset(&mc_op, 0, sizeof(struct xen_mc));
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/* Fetch physical CPU Numbers */
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mc_op.cmd = XEN_MC_physcpuinfo;
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set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
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ret = HYPERVISOR_mca(&mc_op);
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if (ret) {
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pr_err("Failed to get CPU numbers\n");
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return ret;
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}
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/* Fetch each CPU Physical Info for later reference*/
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ncpus = mc_op.u.mc_physcpuinfo.ncpus;
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g_physinfo = kcalloc(ncpus, sizeof(struct mcinfo_logical_cpu),
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GFP_KERNEL);
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if (!g_physinfo)
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return -ENOMEM;
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set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
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ret = HYPERVISOR_mca(&mc_op);
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if (ret) {
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pr_err("Failed to get CPU info\n");
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kfree(g_physinfo);
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return ret;
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}
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ret = bind_virq_to_irqhandler(VIRQ_MCA, 0,
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xen_mce_interrupt, 0, "mce", NULL);
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if (ret < 0) {
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pr_err("Failed to bind virq\n");
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kfree(g_physinfo);
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return ret;
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}
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return 0;
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}
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static int __init xen_late_init_mcelog(void)
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{
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int ret;
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/* Only DOM0 is responsible for MCE logging */
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if (!xen_initial_domain())
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return -ENODEV;
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/* register character device /dev/mcelog for xen mcelog */
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ret = misc_register(&xen_mce_chrdev_device);
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if (ret)
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return ret;
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ret = bind_virq_for_mce();
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if (ret)
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goto deregister;
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pr_info("/dev/mcelog registered by Xen\n");
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return 0;
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deregister:
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misc_deregister(&xen_mce_chrdev_device);
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return ret;
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}
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device_initcall(xen_late_init_mcelog);
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