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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2001 Dave Engebretsen IBM Corporation
*/
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/fs.h>
#include <linux/reboot.h>
#include <linux/irq_work.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/firmware.h>
#include <asm/mce.h>
#include "pseries.h"
static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
static DEFINE_SPINLOCK(ras_log_buf_lock);
static int ras_check_exception_token;
static void mce_process_errlog_event(struct irq_work *work);
static struct irq_work mce_errlog_process_work = {
.func = mce_process_errlog_event,
};
#define EPOW_SENSOR_TOKEN 9
#define EPOW_SENSOR_INDEX 0
/* EPOW events counter variable */
static int num_epow_events;
static irqreturn_t ras_hotplug_interrupt(int irq, void *dev_id);
static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
static irqreturn_t ras_error_interrupt(int irq, void *dev_id);
/* RTAS pseries MCE errorlog section. */
struct pseries_mc_errorlog {
__be32 fru_id;
__be32 proc_id;
u8 error_type;
/*
* sub_err_type (1 byte). Bit fields depends on error_type
*
* MSB0
* |
* V
* 01234567
* XXXXXXXX
*
* For error_type == MC_ERROR_TYPE_UE
* XXXXXXXX
* X 1: Permanent or Transient UE.
* X 1: Effective address provided.
* X 1: Logical address provided.
* XX 2: Reserved.
* XXX 3: Type of UE error.
*
* For error_type != MC_ERROR_TYPE_UE
* XXXXXXXX
* X 1: Effective address provided.
* XXXXX 5: Reserved.
* XX 2: Type of SLB/ERAT/TLB error.
*/
u8 sub_err_type;
u8 reserved_1[6];
__be64 effective_address;
__be64 logical_address;
} __packed;
/* RTAS pseries MCE error types */
#define MC_ERROR_TYPE_UE 0x00
#define MC_ERROR_TYPE_SLB 0x01
#define MC_ERROR_TYPE_ERAT 0x02
#define MC_ERROR_TYPE_UNKNOWN 0x03
#define MC_ERROR_TYPE_TLB 0x04
#define MC_ERROR_TYPE_D_CACHE 0x05
#define MC_ERROR_TYPE_I_CACHE 0x07
/* RTAS pseries MCE error sub types */
#define MC_ERROR_UE_INDETERMINATE 0
#define MC_ERROR_UE_IFETCH 1
#define MC_ERROR_UE_PAGE_TABLE_WALK_IFETCH 2
#define MC_ERROR_UE_LOAD_STORE 3
#define MC_ERROR_UE_PAGE_TABLE_WALK_LOAD_STORE 4
#define UE_EFFECTIVE_ADDR_PROVIDED 0x40
#define UE_LOGICAL_ADDR_PROVIDED 0x20
#define MC_ERROR_SLB_PARITY 0
#define MC_ERROR_SLB_MULTIHIT 1
#define MC_ERROR_SLB_INDETERMINATE 2
#define MC_ERROR_ERAT_PARITY 1
#define MC_ERROR_ERAT_MULTIHIT 2
#define MC_ERROR_ERAT_INDETERMINATE 3
#define MC_ERROR_TLB_PARITY 1
#define MC_ERROR_TLB_MULTIHIT 2
#define MC_ERROR_TLB_INDETERMINATE 3
static inline u8 rtas_mc_error_sub_type(const struct pseries_mc_errorlog *mlog)
{
switch (mlog->error_type) {
case MC_ERROR_TYPE_UE:
return (mlog->sub_err_type & 0x07);
case MC_ERROR_TYPE_SLB:
case MC_ERROR_TYPE_ERAT:
case MC_ERROR_TYPE_TLB:
return (mlog->sub_err_type & 0x03);
default:
return 0;
}
}
/*
* Enable the hotplug interrupt late because processing them may touch other
* devices or systems (e.g. hugepages) that have not been initialized at the
* subsys stage.
*/
int __init init_ras_hotplug_IRQ(void)
{
struct device_node *np;
/* Hotplug Events */
np = of_find_node_by_path("/event-sources/hot-plug-events");
if (np != NULL) {
if (dlpar_workqueue_init() == 0)
request_event_sources_irqs(np, ras_hotplug_interrupt,
"RAS_HOTPLUG");
of_node_put(np);
}
return 0;
}
machine_late_initcall(pseries, init_ras_hotplug_IRQ);
/*
* Initialize handlers for the set of interrupts caused by hardware errors
* and power system events.
*/
static int __init init_ras_IRQ(void)
{
struct device_node *np;
ras_check_exception_token = rtas_token("check-exception");
/* Internal Errors */
np = of_find_node_by_path("/event-sources/internal-errors");
if (np != NULL) {
request_event_sources_irqs(np, ras_error_interrupt,
"RAS_ERROR");
of_node_put(np);
}
/* EPOW Events */
np = of_find_node_by_path("/event-sources/epow-events");
if (np != NULL) {
request_event_sources_irqs(np, ras_epow_interrupt, "RAS_EPOW");
of_node_put(np);
}
return 0;
}
machine_subsys_initcall(pseries, init_ras_IRQ);
#define EPOW_SHUTDOWN_NORMAL 1
#define EPOW_SHUTDOWN_ON_UPS 2
#define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS 3
#define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH 4
static void handle_system_shutdown(char event_modifier)
{
switch (event_modifier) {
case EPOW_SHUTDOWN_NORMAL:
pr_emerg("Power off requested\n");
orderly_poweroff(true);
break;
case EPOW_SHUTDOWN_ON_UPS:
pr_emerg("Loss of system power detected. System is running on"
" UPS/battery. Check RTAS error log for details\n");
break;
case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS:
pr_emerg("Loss of system critical functions detected. Check"
" RTAS error log for details\n");
orderly_poweroff(true);
break;
case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH:
pr_emerg("High ambient temperature detected. Check RTAS"
" error log for details\n");
orderly_poweroff(true);
break;
default:
pr_err("Unknown power/cooling shutdown event (modifier = %d)\n",
event_modifier);
}
}
struct epow_errorlog {
unsigned char sensor_value;
unsigned char event_modifier;
unsigned char extended_modifier;
unsigned char reserved;
unsigned char platform_reason;
};
#define EPOW_RESET 0
#define EPOW_WARN_COOLING 1
#define EPOW_WARN_POWER 2
#define EPOW_SYSTEM_SHUTDOWN 3
#define EPOW_SYSTEM_HALT 4
#define EPOW_MAIN_ENCLOSURE 5
#define EPOW_POWER_OFF 7
static void rtas_parse_epow_errlog(struct rtas_error_log *log)
{
struct pseries_errorlog *pseries_log;
struct epow_errorlog *epow_log;
char action_code;
char modifier;
pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW);
if (pseries_log == NULL)
return;
epow_log = (struct epow_errorlog *)pseries_log->data;
action_code = epow_log->sensor_value & 0xF; /* bottom 4 bits */
modifier = epow_log->event_modifier & 0xF; /* bottom 4 bits */
switch (action_code) {
case EPOW_RESET:
if (num_epow_events) {
pr_info("Non critical power/cooling issue cleared\n");
num_epow_events--;
}
break;
case EPOW_WARN_COOLING:
pr_info("Non-critical cooling issue detected. Check RTAS error"
" log for details\n");
break;
case EPOW_WARN_POWER:
pr_info("Non-critical power issue detected. Check RTAS error"
" log for details\n");
break;
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