^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * mcelog.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Driver for receiving and transferring machine check error infomation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2012 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Liu, Jinsong <jinsong.liu@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Jiang, Yunhong <yunhong.jiang@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Author: Ke, Liping <liping.ke@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * modify it under the terms of the GNU General Public License version 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * as published by the Free Software Foundation; or, when distributed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * separately from the Linux kernel or incorporated into other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * software packages, subject to the following license:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Permission is hereby granted, free of charge, to any person obtaining a copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * of this source file (the "Software"), to deal in the Software without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * restriction, including without limitation the rights to use, copy, modify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * merge, publish, distribute, sublicense, and/or sell copies of the Software,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * and to permit persons to whom the Software is furnished to do so, subject to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * the following conditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * The above copyright notice and this permission notice shall be included in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * all copies or substantial portions of the Software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * IN THE SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define pr_fmt(fmt) "xen_mcelog: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <xen/interface/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <xen/events.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <xen/interface/vcpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <xen/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <asm/xen/hypercall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <asm/xen/hypervisor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static struct mc_info g_mi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static struct mcinfo_logical_cpu *g_physinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static uint32_t ncpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static DEFINE_MUTEX(mcelog_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct xen_mce_log xen_mcelog = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .signature = XEN_MCE_LOG_SIGNATURE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .len = XEN_MCE_LOG_LEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .recordlen = sizeof(struct xen_mce),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static DEFINE_SPINLOCK(xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int xen_mce_chrdev_open_count; /* #times opened */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int xen_mce_chrdev_open_exclu; /* already open exclusive? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static DECLARE_WAIT_QUEUE_HEAD(xen_mce_chrdev_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static int xen_mce_chrdev_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) spin_lock(&xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (xen_mce_chrdev_open_exclu ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) (xen_mce_chrdev_open_count && (file->f_flags & O_EXCL))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) spin_unlock(&xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (file->f_flags & O_EXCL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) xen_mce_chrdev_open_exclu = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) xen_mce_chrdev_open_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) spin_unlock(&xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return nonseekable_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static int xen_mce_chrdev_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) spin_lock(&xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) xen_mce_chrdev_open_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) xen_mce_chrdev_open_exclu = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) spin_unlock(&xen_mce_chrdev_state_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static ssize_t xen_mce_chrdev_read(struct file *filp, char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) size_t usize, loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) char __user *buf = ubuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) unsigned num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) mutex_lock(&mcelog_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) num = xen_mcelog.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* Only supports full reads right now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (*off != 0 || usize < XEN_MCE_LOG_LEN*sizeof(struct xen_mce))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) for (i = 0; i < num; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct xen_mce *m = &xen_mcelog.entry[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) err |= copy_to_user(buf, m, sizeof(*m));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) buf += sizeof(*m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) memset(xen_mcelog.entry, 0, num * sizeof(struct xen_mce));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) xen_mcelog.next = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) mutex_unlock(&mcelog_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return err ? err : buf - ubuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static __poll_t xen_mce_chrdev_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) poll_wait(file, &xen_mce_chrdev_wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (xen_mcelog.next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static long xen_mce_chrdev_ioctl(struct file *f, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int __user *p = (int __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) case MCE_GET_RECORD_LEN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return put_user(sizeof(struct xen_mce), p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) case MCE_GET_LOG_LEN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return put_user(XEN_MCE_LOG_LEN, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) case MCE_GETCLEAR_FLAGS: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) flags = xen_mcelog.flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) } while (cmpxchg(&xen_mcelog.flags, flags, 0) != flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return put_user(flags, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static const struct file_operations xen_mce_chrdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) .open = xen_mce_chrdev_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .release = xen_mce_chrdev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .read = xen_mce_chrdev_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .poll = xen_mce_chrdev_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .unlocked_ioctl = xen_mce_chrdev_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static struct miscdevice xen_mce_chrdev_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) MISC_MCELOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) "mcelog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) &xen_mce_chrdev_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * Caller should hold the mcelog_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static void xen_mce_log(struct xen_mce *mce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unsigned entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) entry = xen_mcelog.next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * When the buffer fills up discard new entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * Assume that the earlier errors are the more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * interesting ones:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (entry >= XEN_MCE_LOG_LEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) set_bit(XEN_MCE_OVERFLOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) (unsigned long *)&xen_mcelog.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) memcpy(xen_mcelog.entry + entry, mce, sizeof(struct xen_mce));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) xen_mcelog.next++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static int convert_log(struct mc_info *mi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) struct mcinfo_common *mic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct mcinfo_global *mc_global;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct mcinfo_bank *mc_bank;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct xen_mce m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) unsigned int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) mic = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) x86_mcinfo_lookup(&mic, mi, MC_TYPE_GLOBAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (unlikely(!mic)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) pr_warn("Failed to find global error info\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) memset(&m, 0, sizeof(struct xen_mce));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) mc_global = (struct mcinfo_global *)mic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) m.mcgstatus = mc_global->mc_gstatus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) m.apicid = mc_global->mc_apicid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) for (i = 0; i < ncpus; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (g_physinfo[i].mc_apicid == m.apicid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (unlikely(i == ncpus)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) pr_warn("Failed to match cpu with apicid %d\n", m.apicid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) m.socketid = g_physinfo[i].mc_chipid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) m.cpu = m.extcpu = g_physinfo[i].mc_cpunr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) m.cpuvendor = (__u8)g_physinfo[i].mc_vendor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) for (j = 0; j < g_physinfo[i].mc_nmsrvals; ++j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) switch (g_physinfo[i].mc_msrvalues[j].reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) case MSR_IA32_MCG_CAP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) m.mcgcap = g_physinfo[i].mc_msrvalues[j].value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) case MSR_PPIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) case MSR_AMD_PPIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) m.ppin = g_physinfo[i].mc_msrvalues[j].value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) mic = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) x86_mcinfo_lookup(&mic, mi, MC_TYPE_BANK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (unlikely(!mic)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) pr_warn("Fail to find bank error info\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if ((!mic) || (mic->size == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) (mic->type != MC_TYPE_GLOBAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) mic->type != MC_TYPE_BANK &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mic->type != MC_TYPE_EXTENDED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) mic->type != MC_TYPE_RECOVERY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (mic->type == MC_TYPE_BANK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) mc_bank = (struct mcinfo_bank *)mic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) m.misc = mc_bank->mc_misc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) m.status = mc_bank->mc_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) m.addr = mc_bank->mc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) m.tsc = mc_bank->mc_tsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) m.bank = mc_bank->mc_bank;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) m.finished = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /*log this record*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) xen_mce_log(&m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) mic = x86_mcinfo_next(mic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) } while (1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static int mc_queue_handle(uint32_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct xen_mc mc_op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) mc_op.cmd = XEN_MC_fetch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) set_xen_guest_handle(mc_op.u.mc_fetch.data, &g_mi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) mc_op.u.mc_fetch.flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) ret = HYPERVISOR_mca(&mc_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) pr_err("Failed to fetch %surgent error log\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) flags == XEN_MC_URGENT ? "" : "non");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (mc_op.u.mc_fetch.flags & XEN_MC_NODATA ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) mc_op.u.mc_fetch.flags & XEN_MC_FETCHFAILED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ret = convert_log(&g_mi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) pr_warn("Failed to convert this error log, continue acking it anyway\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) mc_op.u.mc_fetch.flags = flags | XEN_MC_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ret = HYPERVISOR_mca(&mc_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) pr_err("Failed to ack previous error log\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) } while (1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /* virq handler for machine check error info*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) static void xen_mce_work_fn(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_lock(&mcelog_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /* urgent mc_info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) err = mc_queue_handle(XEN_MC_URGENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) pr_err("Failed to handle urgent mc_info queue, continue handling nonurgent mc_info queue anyway\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* nonurgent mc_info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) err = mc_queue_handle(XEN_MC_NONURGENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) pr_err("Failed to handle nonurgent mc_info queue\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /* wake processes polling /dev/mcelog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) wake_up_interruptible(&xen_mce_chrdev_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) mutex_unlock(&mcelog_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) static DECLARE_WORK(xen_mce_work, xen_mce_work_fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static irqreturn_t xen_mce_interrupt(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) schedule_work(&xen_mce_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static int bind_virq_for_mce(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct xen_mc mc_op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) memset(&mc_op, 0, sizeof(struct xen_mc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) /* Fetch physical CPU Numbers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) mc_op.cmd = XEN_MC_physcpuinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) ret = HYPERVISOR_mca(&mc_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) pr_err("Failed to get CPU numbers\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /* Fetch each CPU Physical Info for later reference*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) ncpus = mc_op.u.mc_physcpuinfo.ncpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) g_physinfo = kcalloc(ncpus, sizeof(struct mcinfo_logical_cpu),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (!g_physinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) ret = HYPERVISOR_mca(&mc_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) pr_err("Failed to get CPU info\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) kfree(g_physinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) ret = bind_virq_to_irqhandler(VIRQ_MCA, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) xen_mce_interrupt, 0, "mce", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) pr_err("Failed to bind virq\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) kfree(g_physinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) static int __init xen_late_init_mcelog(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /* Only DOM0 is responsible for MCE logging */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (!xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /* register character device /dev/mcelog for xen mcelog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) ret = misc_register(&xen_mce_chrdev_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) ret = bind_virq_for_mce();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) goto deregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) pr_info("/dev/mcelog registered by Xen\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) deregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) misc_deregister(&xen_mce_chrdev_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) device_initcall(xen_late_init_mcelog);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags