powerpc/powernv: Get FSP memory errors and plumb into memory poison infrastructure.
authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Fri, 15 Nov 2013 04:20:57 +0000 (09:50 +0530)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Mon, 9 Dec 2013 00:41:14 +0000 (11:41 +1100)
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>
arch/powerpc/include/asm/opal.h
arch/powerpc/platforms/powernv/Makefile
arch/powerpc/platforms/powernv/opal-memory-errors.c [new file with mode: 0644]

index 0a2ac85..aded1b8 100644 (file)
@@ -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,
index 873fa13..8d767fd 100644 (file)
@@ -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
diff --git a/arch/powerpc/platforms/powernv/opal-memory-errors.c b/arch/powerpc/platforms/powernv/opal-memory-errors.c
new file mode 100644 (file)
index 0000000..ec41322
--- /dev/null
@@ -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);