--- /dev/null
+/*
+ * OPAL hypervisor Maintenance interrupt 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2014 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>
+#include <asm/machdep.h>
+
+static int opal_hmi_handler_nb_init;
+struct OpalHmiEvtNode {
+ struct list_head list;
+ struct OpalHMIEvent hmi_evt;
+};
+static LIST_HEAD(opal_hmi_evt_list);
+static DEFINE_SPINLOCK(opal_hmi_evt_lock);
+
+static void print_hmi_event_info(struct OpalHMIEvent *hmi_evt)
+{
+ const char *level, *sevstr, *error_info;
+ static const char *hmi_error_types[] = {
+ "Malfunction Alert",
+ "Processor Recovery done",
+ "Processor recovery occurred again",
+ "Processor recovery occurred for masked error",
+ "Timer facility experienced an error",
+ "TFMR SPR is corrupted",
+ "UPS (Uniterrupted Power System) Overflow indication",
+ "An XSCOM operation failure",
+ "An XSCOM operation completed",
+ "SCOM has set a reserved FIR bit to cause recovery",
+ "Debug trigger has set a reserved FIR bit to cause recovery",
+ "A hypervisor resource error occurred"
+ };
+
+ /* Print things out */
+ if (hmi_evt->version < OpalHMIEvt_V1) {
+ pr_err("HMI Interrupt, Unknown event version %d !\n",
+ hmi_evt->version);
+ return;
+ }
+ switch (hmi_evt->severity) {
+ case OpalHMI_SEV_NO_ERROR:
+ level = KERN_INFO;
+ sevstr = "Harmless";
+ break;
+ case OpalHMI_SEV_WARNING:
+ level = KERN_WARNING;
+ sevstr = "";
+ break;
+ case OpalHMI_SEV_ERROR_SYNC:
+ level = KERN_ERR;
+ sevstr = "Severe";
+ break;
+ case OpalHMI_SEV_FATAL:
+ default:
+ level = KERN_ERR;
+ sevstr = "Fatal";
+ break;
+ }
+
+ printk("%s%s Hypervisor Maintenance interrupt [%s]\n",
+ level, sevstr,
+ hmi_evt->disposition == OpalHMI_DISPOSITION_RECOVERED ?
+ "Recovered" : "Not recovered");
+ error_info = hmi_evt->type < ARRAY_SIZE(hmi_error_types) ?
+ hmi_error_types[hmi_evt->type]
+ : "Unknown";
+ printk("%s Error detail: %s\n", level, error_info);
+ printk("%s HMER: %016llx\n", level, be64_to_cpu(hmi_evt->hmer));
+ if ((hmi_evt->type == OpalHMI_ERROR_TFAC) ||
+ (hmi_evt->type == OpalHMI_ERROR_TFMR_PARITY))
+ printk("%s TFMR: %016llx\n", level,
+ be64_to_cpu(hmi_evt->tfmr));
+}
+
+static void hmi_event_handler(struct work_struct *work)
+{
+ unsigned long flags;
+ struct OpalHMIEvent *hmi_evt;
+ struct OpalHmiEvtNode *msg_node;
+ uint8_t disposition;
+
+ spin_lock_irqsave(&opal_hmi_evt_lock, flags);
+ while (!list_empty(&opal_hmi_evt_list)) {
+ msg_node = list_entry(opal_hmi_evt_list.next,
+ struct OpalHmiEvtNode, list);
+ list_del(&msg_node->list);
+ spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);
+
+ hmi_evt = (struct OpalHMIEvent *) &msg_node->hmi_evt;
+ print_hmi_event_info(hmi_evt);
+ disposition = hmi_evt->disposition;
+ kfree(msg_node);
+
+ /*
+ * Check if HMI event has been recovered or not. If not
+ * then we can't continue, invoke panic.
+ */
+ if (disposition != OpalHMI_DISPOSITION_RECOVERED)
+ panic("Unrecoverable HMI exception");
+
+ spin_lock_irqsave(&opal_hmi_evt_lock, flags);
+ }
+ spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);
+}
+
+static DECLARE_WORK(hmi_event_work, hmi_event_handler);
+/*
+ * opal_handle_hmi_event - notifier handler that queues up HMI events
+ * to be preocessed later.
+ */
+static int opal_handle_hmi_event(struct notifier_block *nb,
+ unsigned long msg_type, void *msg)
+{
+ unsigned long flags;
+ struct OpalHMIEvent *hmi_evt;
+ struct opal_msg *hmi_msg = msg;
+ struct OpalHmiEvtNode *msg_node;
+
+ /* Sanity Checks */
+ if (msg_type != OPAL_MSG_HMI_EVT)
+ return 0;
+
+ /* HMI event info starts from param[0] */
+ hmi_evt = (struct OpalHMIEvent *)&hmi_msg->params[0];
+
+ /* Delay the logging of HMI events to workqueue. */
+ msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC);
+ if (!msg_node) {
+ pr_err("HMI: out of memory, Opal message event not handled\n");
+ return -ENOMEM;
+ }
+ memcpy(&msg_node->hmi_evt, hmi_evt, sizeof(struct OpalHMIEvent));
+
+ spin_lock_irqsave(&opal_hmi_evt_lock, flags);
+ list_add(&msg_node->list, &opal_hmi_evt_list);
+ spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);
+
+ schedule_work(&hmi_event_work);
+ return 0;
+}
+
+static struct notifier_block opal_hmi_handler_nb = {
+ .notifier_call = opal_handle_hmi_event,
+ .next = NULL,
+ .priority = 0,
+};
+
+static int __init opal_hmi_handler_init(void)
+{
+ int ret;
+
+ if (!opal_hmi_handler_nb_init) {
+ ret = opal_message_notifier_register(
+ OPAL_MSG_HMI_EVT, &opal_hmi_handler_nb);
+ if (ret) {
+ pr_err("%s: Can't register OPAL event notifier (%d)\n",
+ __func__, ret);
+ return ret;
+ }
+ opal_hmi_handler_nb_init = 1;
+ }
+ return 0;
+}
+machine_subsys_initcall(powernv, opal_hmi_handler_init);
Code Review / kvmfornfv.git / blobdiff