/* * OPAL asynchronus Memory error handling support in PowreNV. * * 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. * * Copyright 2013 IBM Corporation * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> */ #undef DEBUG #include <linux/kernel.h> #include <linux/init.h> #include <linux/of.h> #include <linux/mm.h> #include <linux/slab.h> #include <asm/opal.h> #include <asm/cputable.h> static int opal_mem_err_nb_init; static LIST_HEAD(opal_memory_err_list); static DEFINE_SPINLOCK(opal_mem_err_lock); struct OpalMsgNode { struct list_head list; struct opal_msg msg; }; static void handle_memory_error_event(struct OpalMemoryErrorData *merr_evt) { uint64_t paddr_start, paddr_end; pr_debug("%s: Retrived memory error event, type: 0x%x\n", __func__, merr_evt->type); switch (merr_evt->type) { case OPAL_MEM_ERR_TYPE_RESILIENCE: paddr_start = merr_evt->u.resilience.physical_address_start; paddr_end = merr_evt->u.resilience.physical_address_end; break; case OPAL_MEM_ERR_TYPE_DYN_DALLOC: paddr_start = merr_evt->u.dyn_dealloc.physical_address_start; paddr_end = merr_evt->u.dyn_dealloc.physical_address_end; break; default: return; } for (; paddr_start < paddr_end; paddr_start += PAGE_SIZE) { memory_failure(paddr_start >> PAGE_SHIFT, 0, 0); } } static void handle_memory_error(void) { unsigned long flags; struct OpalMemoryErrorData *merr_evt; struct OpalMsgNode *msg_node; spin_lock_irqsave(&opal_mem_err_lock, flags); while (!list_empty(&opal_memory_err_list)) { msg_node = list_entry(opal_memory_err_list.next, struct OpalMsgNode, list); list_del(&msg_node->list); spin_unlock_irqrestore(&opal_mem_err_lock, flags); merr_evt = (struct OpalMemoryErrorData *) &msg_node->msg.params[0]; handle_memory_error_event(merr_evt); kfree(msg_node); spin_lock_irqsave(&opal_mem_err_lock, flags); } spin_unlock_irqrestore(&opal_mem_err_lock, flags); } static void mem_error_handler(struct work_struct *work) { handle_memory_error(); } static DECLARE_WORK(mem_error_work, mem_error_handler); /* * opal_memory_err_event - notifier handler that queues up the opal message * to be preocessed later. */ static int opal_memory_err_event(struct notifier_block *nb, unsigned long msg_type, void *msg) { unsigned long flags; struct OpalMsgNode *msg_node; if (msg_type != OPAL_MSG_MEM_ERR) return 0; msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC); if (!msg_node) { pr_err("MEMORY_ERROR: out of memory, Opal message event not" "handled\n"); return -ENOMEM; } memcpy(&msg_node->msg, msg, sizeof(struct opal_msg)); spin_lock_irqsave(&opal_mem_err_lock, flags); list_add(&msg_node->list, &opal_memory_err_list); spin_unlock_irqrestore(&opal_mem_err_lock, flags); schedule_work(&mem_error_work); return 0; } static struct notifier_block opal_mem_err_nb = { .notifier_call = opal_memory_err_event, .next = NULL, .priority = 0, }; static int __init opal_mem_err_init(void) { int ret; if (!opal_mem_err_nb_init) { ret = opal_message_notifier_register( OPAL_MSG_MEM_ERR, &opal_mem_err_nb); if (ret) { pr_err("%s: Can't register OPAL event notifier (%d)\n", __func__, ret); return ret; } opal_mem_err_nb_init = 1; } return 0; } subsys_initcall(opal_mem_err_init);