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powerpc/powernv: Get FSP memory errors and plumb into memory poison i…
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…nfrastructure.

Get the memory errors reported by opal and plumb it into memory poison
infrastructure. This patch uses new messaging channel infrastructure to
pull the fsp memory errors to linux.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Mahesh Salgaonkar authored and Benjamin Herrenschmidt committed Dec 9, 2013
1 parent f2296a3 commit 75eb3d9
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52 changes: 52 additions & 0 deletions arch/powerpc/include/asm/opal.h
Original file line number Diff line number Diff line change
Expand Up @@ -443,6 +443,58 @@ struct opal_machine_check_event {
} u;
};

/* FSP memory errors handling */
enum OpalMemErr_Version {
OpalMemErr_V1 = 1,
};

enum OpalMemErrType {
OPAL_MEM_ERR_TYPE_RESILIENCE = 0,
OPAL_MEM_ERR_TYPE_DYN_DALLOC,
OPAL_MEM_ERR_TYPE_SCRUB,
};

/* Memory Reilience error type */
enum OpalMemErr_ResilErrType {
OPAL_MEM_RESILIENCE_CE = 0,
OPAL_MEM_RESILIENCE_UE,
OPAL_MEM_RESILIENCE_UE_SCRUB,
};

/* Dynamic Memory Deallocation type */
enum OpalMemErr_DynErrType {
OPAL_MEM_DYNAMIC_DEALLOC = 0,
};

/* OpalMemoryErrorData->flags */
#define OPAL_MEM_CORRECTED_ERROR 0x0001
#define OPAL_MEM_THRESHOLD_EXCEEDED 0x0002
#define OPAL_MEM_ACK_REQUIRED 0x8000

struct OpalMemoryErrorData {
enum OpalMemErr_Version version:8; /* 0x00 */
enum OpalMemErrType type:8; /* 0x01 */
uint16_t flags; /* 0x02 */
uint8_t reserved_1[4]; /* 0x04 */

union {
/* Memory Resilience corrected/uncorrected error info */
struct {
enum OpalMemErr_ResilErrType resil_err_type:8;
uint8_t reserved_1[7];
uint64_t physical_address_start;
uint64_t physical_address_end;
} resilience;
/* Dynamic memory deallocation error info */
struct {
enum OpalMemErr_DynErrType dyn_err_type:8;
uint8_t reserved_1[7];
uint64_t physical_address_start;
uint64_t physical_address_end;
} dyn_dealloc;
} u;
};

enum {
OPAL_P7IOC_DIAG_TYPE_NONE = 0,
OPAL_P7IOC_DIAG_TYPE_RGC = 1,
Expand Down
1 change: 1 addition & 0 deletions arch/powerpc/platforms/powernv/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -6,3 +6,4 @@ obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o
obj-$(CONFIG_EEH) += eeh-ioda.o eeh-powernv.o
obj-$(CONFIG_PPC_SCOM) += opal-xscom.o
obj-$(CONFIG_MEMORY_FAILURE) += opal-memory-errors.o
146 changes: 146 additions & 0 deletions arch/powerpc/platforms/powernv/opal-memory-errors.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,146 @@
/*
* 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);

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