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134 lines
3.3 KiB
134 lines
3.3 KiB
// 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 <[email protected]> |
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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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