forked from Minki/linux
1a59d1b8e0
Based on 1 normalized pattern(s): 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 this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OPAL asynchronus Memory error handling support in PowerNV.
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*
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* Copyright 2013 IBM Corporation
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* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/machdep.h>
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#include <asm/opal.h>
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#include <asm/cputable.h>
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static int opal_mem_err_nb_init;
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static LIST_HEAD(opal_memory_err_list);
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static DEFINE_SPINLOCK(opal_mem_err_lock);
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struct OpalMsgNode {
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struct list_head list;
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struct opal_msg msg;
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};
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static void handle_memory_error_event(struct OpalMemoryErrorData *merr_evt)
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{
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uint64_t paddr_start, paddr_end;
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pr_debug("%s: Retrieved memory error event, type: 0x%x\n",
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__func__, merr_evt->type);
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switch (merr_evt->type) {
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case OPAL_MEM_ERR_TYPE_RESILIENCE:
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paddr_start = be64_to_cpu(merr_evt->u.resilience.physical_address_start);
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paddr_end = be64_to_cpu(merr_evt->u.resilience.physical_address_end);
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break;
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case OPAL_MEM_ERR_TYPE_DYN_DALLOC:
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paddr_start = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_start);
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paddr_end = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_end);
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break;
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default:
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return;
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}
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for (; paddr_start < paddr_end; paddr_start += PAGE_SIZE) {
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memory_failure(paddr_start >> PAGE_SHIFT, 0);
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}
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}
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static void handle_memory_error(void)
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{
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unsigned long flags;
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struct OpalMemoryErrorData *merr_evt;
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struct OpalMsgNode *msg_node;
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spin_lock_irqsave(&opal_mem_err_lock, flags);
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while (!list_empty(&opal_memory_err_list)) {
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msg_node = list_entry(opal_memory_err_list.next,
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struct OpalMsgNode, list);
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list_del(&msg_node->list);
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spin_unlock_irqrestore(&opal_mem_err_lock, flags);
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merr_evt = (struct OpalMemoryErrorData *)
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&msg_node->msg.params[0];
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handle_memory_error_event(merr_evt);
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kfree(msg_node);
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spin_lock_irqsave(&opal_mem_err_lock, flags);
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}
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spin_unlock_irqrestore(&opal_mem_err_lock, flags);
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}
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static void mem_error_handler(struct work_struct *work)
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{
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handle_memory_error();
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}
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static DECLARE_WORK(mem_error_work, mem_error_handler);
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/*
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* opal_memory_err_event - notifier handler that queues up the opal message
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* to be preocessed later.
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*/
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static int opal_memory_err_event(struct notifier_block *nb,
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unsigned long msg_type, void *msg)
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{
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unsigned long flags;
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struct OpalMsgNode *msg_node;
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if (msg_type != OPAL_MSG_MEM_ERR)
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return 0;
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msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC);
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if (!msg_node) {
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pr_err("MEMORY_ERROR: out of memory, Opal message event not"
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"handled\n");
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return -ENOMEM;
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}
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memcpy(&msg_node->msg, msg, sizeof(msg_node->msg));
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spin_lock_irqsave(&opal_mem_err_lock, flags);
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list_add(&msg_node->list, &opal_memory_err_list);
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spin_unlock_irqrestore(&opal_mem_err_lock, flags);
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schedule_work(&mem_error_work);
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return 0;
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}
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static struct notifier_block opal_mem_err_nb = {
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.notifier_call = opal_memory_err_event,
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.next = NULL,
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.priority = 0,
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};
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static int __init opal_mem_err_init(void)
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{
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int ret;
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if (!opal_mem_err_nb_init) {
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ret = opal_message_notifier_register(
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OPAL_MSG_MEM_ERR, &opal_mem_err_nb);
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if (ret) {
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pr_err("%s: Can't register OPAL event notifier (%d)\n",
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__func__, ret);
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return ret;
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}
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opal_mem_err_nb_init = 1;
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}
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return 0;
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}
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machine_device_initcall(powernv, opal_mem_err_init);
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