135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* OPAL asynchronus Memory error handling support in PowerNV.
|
|
*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
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(msg_node->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);
|