diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-hmi.c')
-rw-r--r-- | arch/powerpc/platforms/powernv/opal-hmi.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-hmi.c b/arch/powerpc/platforms/powernv/opal-hmi.c new file mode 100644 index 000000000000..5e1ed1575aab --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-hmi.c @@ -0,0 +1,189 @@ +/* + * 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); |