#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
#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
}
}
-static
-inline u64 rtas_mc_get_effective_addr(const struct pseries_mc_errorlog *mlog)
-{
- __be64 addr = 0;
-
- switch (mlog->error_type) {
- case MC_ERROR_TYPE_UE:
- if (mlog->sub_err_type & 0x40)
- addr = mlog->effective_address;
- break;
- case MC_ERROR_TYPE_SLB:
- case MC_ERROR_TYPE_ERAT:
- case MC_ERROR_TYPE_TLB:
- if (mlog->sub_err_type & 0x80)
- addr = mlog->effective_address;
- default:
- break;
- }
- return be64_to_cpu(addr);
-}
-
/*
* Enable the hotplug interrupt late because processing them may touch other
* devices or systems (e.g. hugepages) that have not been initialized at the
return 0; /* need to perform reset */
}
-#define VAL_TO_STRING(ar, val) \
- (((val) < ARRAY_SIZE(ar)) ? ar[(val)] : "Unknown")
-static void pseries_print_mce_info(struct pt_regs *regs,
- struct rtas_error_log *errp)
+static int mce_handle_error(struct pt_regs *regs, struct rtas_error_log *errp)
{
- const char *level, *sevstr;
+ struct mce_error_info mce_err = { 0 };
+ unsigned long eaddr = 0, paddr = 0;
struct pseries_errorlog *pseries_log;
struct pseries_mc_errorlog *mce_log;
- u8 error_type, err_sub_type;
- u64 addr;
- u8 initiator = rtas_error_initiator(errp);
int disposition = rtas_error_disposition(errp);
+ int initiator = rtas_error_initiator(errp);
+ int severity = rtas_error_severity(errp);
+ u8 error_type, err_sub_type;
- static const char * const initiators[] = {
- [0] = "Unknown",
- [1] = "CPU",
- [2] = "PCI",
- [3] = "ISA",
- [4] = "Memory",
- [5] = "Power Mgmt",
- };
- static const char * const mc_err_types[] = {
- [0] = "UE",
- [1] = "SLB",
- [2] = "ERAT",
- [3] = "Unknown",
- [4] = "TLB",
- [5] = "D-Cache",
- [6] = "Unknown",
- [7] = "I-Cache",
- };
- static const char * const mc_ue_types[] = {
- [0] = "Indeterminate",
- [1] = "Instruction fetch",
- [2] = "Page table walk ifetch",
- [3] = "Load/Store",
- [4] = "Page table walk Load/Store",
- };
-
- /* SLB sub errors valid values are 0x0, 0x1, 0x2 */
- static const char * const mc_slb_types[] = {
- [0] = "Parity",
- [1] = "Multihit",
- [2] = "Indeterminate",
- };
-
- /* TLB and ERAT sub errors valid values are 0x1, 0x2, 0x3 */
- static const char * const mc_soft_types[] = {
- [0] = "Unknown",
- [1] = "Parity",
- [2] = "Multihit",
- [3] = "Indeterminate",
- };
-
- if (!rtas_error_extended(errp)) {
- pr_err("Machine check interrupt: Missing extended error log\n");
- return;
- }
+ if (initiator == RTAS_INITIATOR_UNKNOWN)
+ mce_err.initiator = MCE_INITIATOR_UNKNOWN;
+ else if (initiator == RTAS_INITIATOR_CPU)
+ mce_err.initiator = MCE_INITIATOR_CPU;
+ else if (initiator == RTAS_INITIATOR_PCI)
+ mce_err.initiator = MCE_INITIATOR_PCI;
+ else if (initiator == RTAS_INITIATOR_ISA)
+ mce_err.initiator = MCE_INITIATOR_ISA;
+ else if (initiator == RTAS_INITIATOR_MEMORY)
+ mce_err.initiator = MCE_INITIATOR_MEMORY;
+ else if (initiator == RTAS_INITIATOR_POWERMGM)
+ mce_err.initiator = MCE_INITIATOR_POWERMGM;
+ else
+ mce_err.initiator = MCE_INITIATOR_UNKNOWN;
+
+ if (severity == RTAS_SEVERITY_NO_ERROR)
+ mce_err.severity = MCE_SEV_NO_ERROR;
+ else if (severity == RTAS_SEVERITY_EVENT)
+ mce_err.severity = MCE_SEV_WARNING;
+ else if (severity == RTAS_SEVERITY_WARNING)
+ mce_err.severity = MCE_SEV_WARNING;
+ else if (severity == RTAS_SEVERITY_ERROR_SYNC)
+ mce_err.severity = MCE_SEV_SEVERE;
+ else if (severity == RTAS_SEVERITY_ERROR)
+ mce_err.severity = MCE_SEV_SEVERE;
+ else if (severity == RTAS_SEVERITY_FATAL)
+ mce_err.severity = MCE_SEV_FATAL;
+ else
+ mce_err.severity = MCE_SEV_FATAL;
+
+ if (severity <= RTAS_SEVERITY_ERROR_SYNC)
+ mce_err.sync_error = true;
+ else
+ mce_err.sync_error = false;
+
+ mce_err.error_type = MCE_ERROR_TYPE_UNKNOWN;
+ mce_err.error_class = MCE_ECLASS_UNKNOWN;
+
+ if (!rtas_error_extended(errp))
+ goto out;
pseries_log = get_pseries_errorlog(errp, PSERIES_ELOG_SECT_ID_MCE);
if (pseries_log == NULL)
- return;
+ goto out;
mce_log = (struct pseries_mc_errorlog *)pseries_log->data;
-
error_type = mce_log->error_type;
err_sub_type = rtas_mc_error_sub_type(mce_log);
- switch (rtas_error_severity(errp)) {
- case RTAS_SEVERITY_NO_ERROR:
- level = KERN_INFO;
- sevstr = "Harmless";
- break;
- case RTAS_SEVERITY_WARNING:
- level = KERN_WARNING;
- sevstr = "";
- break;
- case RTAS_SEVERITY_ERROR:
- case RTAS_SEVERITY_ERROR_SYNC:
- level = KERN_ERR;
- sevstr = "Severe";
- break;
- case RTAS_SEVERITY_FATAL:
- default:
- level = KERN_ERR;
- sevstr = "Fatal";
- break;
- }
+ switch (mce_log->error_type) {
+ case MC_ERROR_TYPE_UE:
+ mce_err.error_type = MCE_ERROR_TYPE_UE;
+ switch (err_sub_type) {
+ case MC_ERROR_UE_IFETCH:
+ mce_err.u.ue_error_type = MCE_UE_ERROR_IFETCH;
+ break;
+ case MC_ERROR_UE_PAGE_TABLE_WALK_IFETCH:
+ mce_err.u.ue_error_type = MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH;
+ break;
+ case MC_ERROR_UE_LOAD_STORE:
+ mce_err.u.ue_error_type = MCE_UE_ERROR_LOAD_STORE;
+ break;
+ case MC_ERROR_UE_PAGE_TABLE_WALK_LOAD_STORE:
+ mce_err.u.ue_error_type = MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE;
+ break;
+ case MC_ERROR_UE_INDETERMINATE:
+ default:
+ mce_err.u.ue_error_type = MCE_UE_ERROR_INDETERMINATE;
+ break;
+ }
+ if (mce_log->sub_err_type & UE_EFFECTIVE_ADDR_PROVIDED)
+ eaddr = be64_to_cpu(mce_log->effective_address);
-#ifdef CONFIG_PPC_BOOK3S_64
- /* Display faulty slb contents for SLB errors. */
- if (error_type == MC_ERROR_TYPE_SLB)
- slb_dump_contents(local_paca->mce_faulty_slbs);
-#endif
+ if (mce_log->sub_err_type & UE_LOGICAL_ADDR_PROVIDED) {
+ paddr = be64_to_cpu(mce_log->logical_address);
+ } else if (mce_log->sub_err_type & UE_EFFECTIVE_ADDR_PROVIDED) {
+ unsigned long pfn;
- printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
- disposition == RTAS_DISP_FULLY_RECOVERED ?
- "Recovered" : "Not recovered");
- if (user_mode(regs)) {
- printk("%s NIP: [%016lx] PID: %d Comm: %s\n", level,
- regs->nip, current->pid, current->comm);
- } else {
- printk("%s NIP [%016lx]: %pS\n", level, regs->nip,
- (void *)regs->nip);
- }
- printk("%s Initiator: %s\n", level,
- VAL_TO_STRING(initiators, initiator));
+ pfn = addr_to_pfn(regs, eaddr);
+ if (pfn != ULONG_MAX)
+ paddr = pfn << PAGE_SHIFT;
+ }
- switch (error_type) {
- case MC_ERROR_TYPE_UE:
- printk("%s Error type: %s [%s]\n", level,
- VAL_TO_STRING(mc_err_types, error_type),
- VAL_TO_STRING(mc_ue_types, err_sub_type));
break;
case MC_ERROR_TYPE_SLB:
- printk("%s Error type: %s [%s]\n", level,
- VAL_TO_STRING(mc_err_types, error_type),
- VAL_TO_STRING(mc_slb_types, err_sub_type));
+ mce_err.error_type = MCE_ERROR_TYPE_SLB;
+ switch (err_sub_type) {
+ case MC_ERROR_SLB_PARITY:
+ mce_err.u.slb_error_type = MCE_SLB_ERROR_PARITY;
+ break;
+ case MC_ERROR_SLB_MULTIHIT:
+ mce_err.u.slb_error_type = MCE_SLB_ERROR_MULTIHIT;
+ break;
+ case MC_ERROR_SLB_INDETERMINATE:
+ default:
+ mce_err.u.slb_error_type = MCE_SLB_ERROR_INDETERMINATE;
+ break;
+ }
+ if (mce_log->sub_err_type & 0x80)
+ eaddr = be64_to_cpu(mce_log->effective_address);
break;
case MC_ERROR_TYPE_ERAT:
+ mce_err.error_type = MCE_ERROR_TYPE_ERAT;
+ switch (err_sub_type) {
+ case MC_ERROR_ERAT_PARITY:
+ mce_err.u.erat_error_type = MCE_ERAT_ERROR_PARITY;
+ break;
+ case MC_ERROR_ERAT_MULTIHIT:
+ mce_err.u.erat_error_type = MCE_ERAT_ERROR_MULTIHIT;
+ break;
+ case MC_ERROR_ERAT_INDETERMINATE:
+ default:
+ mce_err.u.erat_error_type = MCE_ERAT_ERROR_INDETERMINATE;
+ break;
+ }
+ if (mce_log->sub_err_type & 0x80)
+ eaddr = be64_to_cpu(mce_log->effective_address);
+ break;
case MC_ERROR_TYPE_TLB:
- printk("%s Error type: %s [%s]\n", level,
- VAL_TO_STRING(mc_err_types, error_type),
- VAL_TO_STRING(mc_soft_types, err_sub_type));
+ mce_err.error_type = MCE_ERROR_TYPE_TLB;
+ switch (err_sub_type) {
+ case MC_ERROR_TLB_PARITY:
+ mce_err.u.tlb_error_type = MCE_TLB_ERROR_PARITY;
+ break;
+ case MC_ERROR_TLB_MULTIHIT:
+ mce_err.u.tlb_error_type = MCE_TLB_ERROR_MULTIHIT;
+ break;
+ case MC_ERROR_TLB_INDETERMINATE:
+ default:
+ mce_err.u.tlb_error_type = MCE_TLB_ERROR_INDETERMINATE;
+ break;
+ }
+ if (mce_log->sub_err_type & 0x80)
+ eaddr = be64_to_cpu(mce_log->effective_address);
+ break;
+ case MC_ERROR_TYPE_D_CACHE:
+ mce_err.error_type = MCE_ERROR_TYPE_DCACHE;
break;
+ case MC_ERROR_TYPE_I_CACHE:
+ mce_err.error_type = MCE_ERROR_TYPE_DCACHE;
+ break;
+ case MC_ERROR_TYPE_UNKNOWN:
default:
- printk("%s Error type: %s\n", level,
- VAL_TO_STRING(mc_err_types, error_type));
+ mce_err.error_type = MCE_ERROR_TYPE_UNKNOWN;
break;
}
- addr = rtas_mc_get_effective_addr(mce_log);
- if (addr)
- printk("%s Effective address: %016llx\n", level, addr);
-}
-
-static int mce_handle_error(struct rtas_error_log *errp)
-{
- struct pseries_errorlog *pseries_log;
- struct pseries_mc_errorlog *mce_log;
- int disposition = rtas_error_disposition(errp);
- u8 error_type;
-
- if (!rtas_error_extended(errp))
- goto out;
-
- pseries_log = get_pseries_errorlog(errp, PSERIES_ELOG_SECT_ID_MCE);
- if (pseries_log == NULL)
- goto out;
-
- mce_log = (struct pseries_mc_errorlog *)pseries_log->data;
- error_type = mce_log->error_type;
-
#ifdef CONFIG_PPC_BOOK3S_64
if (disposition == RTAS_DISP_NOT_RECOVERED) {
switch (error_type) {
slb_save_contents(local_paca->mce_faulty_slbs);
flush_and_reload_slb();
disposition = RTAS_DISP_FULLY_RECOVERED;
- rtas_set_disposition_recovered(errp);
break;
default:
break;
}
+ } else if (disposition == RTAS_DISP_LIMITED_RECOVERY) {
+ /* Platform corrected itself but could be degraded */
+ printk(KERN_ERR "MCE: limited recovery, system may "
+ "be degraded\n");
+ disposition = RTAS_DISP_FULLY_RECOVERED;
}
#endif
out:
- return disposition;
-}
-
-#ifdef CONFIG_MEMORY_FAILURE
-
-static DEFINE_PER_CPU(int, rtas_ue_count);
-static DEFINE_PER_CPU(unsigned long, rtas_ue_paddr[MAX_MC_EVT]);
+ save_mce_event(regs, disposition == RTAS_DISP_FULLY_RECOVERED,
+ &mce_err, regs->nip, eaddr, paddr);
-#define UE_EFFECTIVE_ADDR_PROVIDED 0x40
-#define UE_LOGICAL_ADDR_PROVIDED 0x20
-
-
-static void pseries_hwpoison_work_fn(struct work_struct *work)
-{
- unsigned long paddr;
- int index;
-
- while (__this_cpu_read(rtas_ue_count) > 0) {
- index = __this_cpu_read(rtas_ue_count) - 1;
- paddr = __this_cpu_read(rtas_ue_paddr[index]);
- memory_failure(paddr >> PAGE_SHIFT, 0);
- __this_cpu_dec(rtas_ue_count);
- }
-}
-
-static DECLARE_WORK(hwpoison_work, pseries_hwpoison_work_fn);
-
-static void queue_ue_paddr(unsigned long paddr)
-{
- int index;
-
- index = __this_cpu_inc_return(rtas_ue_count) - 1;
- if (index >= MAX_MC_EVT) {
- __this_cpu_dec(rtas_ue_count);
- return;
- }
- this_cpu_write(rtas_ue_paddr[index], paddr);
- schedule_work(&hwpoison_work);
-}
-
-static void pseries_do_memory_failure(struct pt_regs *regs,
- struct pseries_mc_errorlog *mce_log)
-{
- unsigned long paddr;
-
- if (mce_log->sub_err_type & UE_LOGICAL_ADDR_PROVIDED) {
- paddr = be64_to_cpu(mce_log->logical_address);
- } else if (mce_log->sub_err_type & UE_EFFECTIVE_ADDR_PROVIDED) {
- unsigned long pfn;
-
- pfn = addr_to_pfn(regs,
- be64_to_cpu(mce_log->effective_address));
- if (pfn == ULONG_MAX)
- return;
- paddr = pfn << PAGE_SHIFT;
- } else {
- return;
- }
- queue_ue_paddr(paddr);
-}
-
-static void pseries_process_ue(struct pt_regs *regs,
- struct rtas_error_log *errp)
-{
- struct pseries_errorlog *pseries_log;
- struct pseries_mc_errorlog *mce_log;
-
- if (!rtas_error_extended(errp))
- return;
-
- pseries_log = get_pseries_errorlog(errp, PSERIES_ELOG_SECT_ID_MCE);
- if (!pseries_log)
- return;
-
- mce_log = (struct pseries_mc_errorlog *)pseries_log->data;
-
- if (mce_log->error_type == MC_ERROR_TYPE_UE)
- pseries_do_memory_failure(regs, mce_log);
+ return disposition;
}
-#else
-static inline void pseries_process_ue(struct pt_regs *regs,
- struct rtas_error_log *errp) { }
-#endif /*CONFIG_MEMORY_FAILURE */
/*
* Process MCE rtas errlog event.
* Return 1 if corrected (or delivered a signal).
* Return 0 if there is nothing we can do.
*/
-static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err)
+static int recover_mce(struct pt_regs *regs, struct machine_check_event *evt)
{
int recovered = 0;
- int disposition = rtas_error_disposition(err);
-
- pseries_print_mce_info(regs, err);
if (!(regs->msr & MSR_RI)) {
/* If MSR_RI isn't set, we cannot recover */
pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
recovered = 0;
-
- } else if (disposition == RTAS_DISP_FULLY_RECOVERED) {
+ } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
/* Platform corrected itself */
recovered = 1;
+ } else if (evt->severity == MCE_SEV_FATAL) {
+ /* Fatal machine check */
+ pr_err("Machine check interrupt is fatal\n");
+ recovered = 0;
+ }
- } else if (disposition == RTAS_DISP_LIMITED_RECOVERY) {
- /* Platform corrected itself but could be degraded */
- printk(KERN_ERR "MCE: limited recovery, system may "
- "be degraded\n");
- recovered = 1;
-
- } else if (user_mode(regs) && !is_global_init(current) &&
- rtas_error_severity(err) == RTAS_SEVERITY_ERROR_SYNC) {
-
+ if (!recovered && evt->sync_error) {
/*
- * If we received a synchronous error when in userspace
- * kill the task. Firmware may report details of the fail
- * asynchronously, so we can't rely on the target and type
- * fields being valid here.
+ * Try to kill processes if we get a synchronous machine check
+ * (e.g., one caused by execution of this instruction). This
+ * will devolve into a panic if we try to kill init or are in
+ * an interrupt etc.
+ *
+ * TODO: Queue up this address for hwpoisioning later.
+ * TODO: This is not quite right for d-side machine
+ * checks ->nip is not necessarily the important
+ * address.
*/
- printk(KERN_ERR "MCE: uncorrectable error, killing task "
- "%s:%d\n", current->comm, current->pid);
-
- _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
- recovered = 1;
+ if ((user_mode(regs))) {
+ _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
+ recovered = 1;
+ } else if (die_will_crash()) {
+ /*
+ * die() would kill the kernel, so better to go via
+ * the platform reboot code that will log the
+ * machine check.
+ */
+ recovered = 0;
+ } else {
+ die("Machine check", regs, SIGBUS);
+ recovered = 1;
+ }
}
- pseries_process_ue(regs, err);
-
- /* Queue irq work to log this rtas event later. */
- irq_work_queue(&mce_errlog_process_work);
-
return recovered;
}
*/
int pSeries_machine_check_exception(struct pt_regs *regs)
{
- struct rtas_error_log *errp;
+ struct machine_check_event evt;
- if (fwnmi_active) {
- fwnmi_release_errinfo();
- errp = fwnmi_get_errlog();
- if (errp && recover_mce(regs, errp))
- return 1;
+ if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
+ return 0;
+
+ /* Print things out */
+ if (evt.version != MCE_V1) {
+ pr_err("Machine Check Exception, Unknown event version %d !\n",
+ evt.version);
+ return 0;
}
+ machine_check_print_event_info(&evt, user_mode(regs), false);
+
+ if (recover_mce(regs, &evt))
+ return 1;
return 0;
}
* to panic. Hence we will call it as soon as we go into
* virtual mode.
*/
- disposition = mce_handle_error(errp);
+ disposition = mce_handle_error(regs, errp);
+ fwnmi_release_errinfo();
+
+ /* Queue irq work to log this rtas event later. */
+ irq_work_queue(&mce_errlog_process_work);
+
if (disposition == RTAS_DISP_FULLY_RECOVERED)
return 1;
}
projects / platform / kernel / linux-rpi.git / commitdiff