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- /*
- * 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/machdep.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: Retrieved memory error event, type: 0x%x\n",
- __func__, merr_evt->type);
- switch (merr_evt->type) {
- case OPAL_MEM_ERR_TYPE_RESILIENCE:
- paddr_start = be64_to_cpu(merr_evt->u.resilience.physical_address_start);
- paddr_end = be64_to_cpu(merr_evt->u.resilience.physical_address_end);
- break;
- case OPAL_MEM_ERR_TYPE_DYN_DALLOC:
- paddr_start = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_start);
- paddr_end = be64_to_cpu(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;
- }
- machine_device_initcall(powernv, opal_mem_err_init);
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