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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Machine check exception handling.
- *
- * Copyright 2013 IBM Corporation
- * Author: Mahesh Salgaonkar <[email protected]>
- */
- #undef DEBUG
- #define pr_fmt(fmt) "mce: " fmt
- #include <linux/hardirq.h>
- #include <linux/types.h>
- #include <linux/ptrace.h>
- #include <linux/percpu.h>
- #include <linux/export.h>
- #include <linux/irq_work.h>
- #include <linux/extable.h>
- #include <linux/ftrace.h>
- #include <linux/memblock.h>
- #include <linux/of.h>
- #include <asm/interrupt.h>
- #include <asm/machdep.h>
- #include <asm/mce.h>
- #include <asm/nmi.h>
- #include "setup.h"
- static void machine_check_ue_event(struct machine_check_event *evt);
- static void machine_process_ue_event(struct work_struct *work);
- static DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
- static BLOCKING_NOTIFIER_HEAD(mce_notifier_list);
- int mce_register_notifier(struct notifier_block *nb)
- {
- return blocking_notifier_chain_register(&mce_notifier_list, nb);
- }
- EXPORT_SYMBOL_GPL(mce_register_notifier);
- int mce_unregister_notifier(struct notifier_block *nb)
- {
- return blocking_notifier_chain_unregister(&mce_notifier_list, nb);
- }
- EXPORT_SYMBOL_GPL(mce_unregister_notifier);
- static void mce_set_error_info(struct machine_check_event *mce,
- struct mce_error_info *mce_err)
- {
- mce->error_type = mce_err->error_type;
- switch (mce_err->error_type) {
- case MCE_ERROR_TYPE_UE:
- mce->u.ue_error.ue_error_type = mce_err->u.ue_error_type;
- break;
- case MCE_ERROR_TYPE_SLB:
- mce->u.slb_error.slb_error_type = mce_err->u.slb_error_type;
- break;
- case MCE_ERROR_TYPE_ERAT:
- mce->u.erat_error.erat_error_type = mce_err->u.erat_error_type;
- break;
- case MCE_ERROR_TYPE_TLB:
- mce->u.tlb_error.tlb_error_type = mce_err->u.tlb_error_type;
- break;
- case MCE_ERROR_TYPE_USER:
- mce->u.user_error.user_error_type = mce_err->u.user_error_type;
- break;
- case MCE_ERROR_TYPE_RA:
- mce->u.ra_error.ra_error_type = mce_err->u.ra_error_type;
- break;
- case MCE_ERROR_TYPE_LINK:
- mce->u.link_error.link_error_type = mce_err->u.link_error_type;
- break;
- case MCE_ERROR_TYPE_UNKNOWN:
- default:
- break;
- }
- }
- void mce_irq_work_queue(void)
- {
- /* Raise decrementer interrupt */
- arch_irq_work_raise();
- set_mce_pending_irq_work();
- }
- /*
- * Decode and save high level MCE information into per cpu buffer which
- * is an array of machine_check_event structure.
- */
- void save_mce_event(struct pt_regs *regs, long handled,
- struct mce_error_info *mce_err,
- uint64_t nip, uint64_t addr, uint64_t phys_addr)
- {
- int index = local_paca->mce_info->mce_nest_count++;
- struct machine_check_event *mce;
- mce = &local_paca->mce_info->mce_event[index];
- /*
- * Return if we don't have enough space to log mce event.
- * mce_nest_count may go beyond MAX_MC_EVT but that's ok,
- * the check below will stop buffer overrun.
- */
- if (index >= MAX_MC_EVT)
- return;
- /* Populate generic machine check info */
- mce->version = MCE_V1;
- mce->srr0 = nip;
- mce->srr1 = regs->msr;
- mce->gpr3 = regs->gpr[3];
- mce->in_use = 1;
- mce->cpu = get_paca()->paca_index;
- /* Mark it recovered if we have handled it and MSR(RI=1). */
- if (handled && (regs->msr & MSR_RI))
- mce->disposition = MCE_DISPOSITION_RECOVERED;
- else
- mce->disposition = MCE_DISPOSITION_NOT_RECOVERED;
- mce->initiator = mce_err->initiator;
- mce->severity = mce_err->severity;
- mce->sync_error = mce_err->sync_error;
- mce->error_class = mce_err->error_class;
- /*
- * Populate the mce error_type and type-specific error_type.
- */
- mce_set_error_info(mce, mce_err);
- if (mce->error_type == MCE_ERROR_TYPE_UE)
- mce->u.ue_error.ignore_event = mce_err->ignore_event;
- if (!addr)
- return;
- if (mce->error_type == MCE_ERROR_TYPE_TLB) {
- mce->u.tlb_error.effective_address_provided = true;
- mce->u.tlb_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_SLB) {
- mce->u.slb_error.effective_address_provided = true;
- mce->u.slb_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_ERAT) {
- mce->u.erat_error.effective_address_provided = true;
- mce->u.erat_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_USER) {
- mce->u.user_error.effective_address_provided = true;
- mce->u.user_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_RA) {
- mce->u.ra_error.effective_address_provided = true;
- mce->u.ra_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_LINK) {
- mce->u.link_error.effective_address_provided = true;
- mce->u.link_error.effective_address = addr;
- } else if (mce->error_type == MCE_ERROR_TYPE_UE) {
- mce->u.ue_error.effective_address_provided = true;
- mce->u.ue_error.effective_address = addr;
- if (phys_addr != ULONG_MAX) {
- mce->u.ue_error.physical_address_provided = true;
- mce->u.ue_error.physical_address = phys_addr;
- machine_check_ue_event(mce);
- }
- }
- return;
- }
- /*
- * get_mce_event:
- * mce Pointer to machine_check_event structure to be filled.
- * release Flag to indicate whether to free the event slot or not.
- * 0 <= do not release the mce event. Caller will invoke
- * release_mce_event() once event has been consumed.
- * 1 <= release the slot.
- *
- * return 1 = success
- * 0 = failure
- *
- * get_mce_event() will be called by platform specific machine check
- * handle routine and in KVM.
- * When we call get_mce_event(), we are still in interrupt context and
- * preemption will not be scheduled until ret_from_expect() routine
- * is called.
- */
- int get_mce_event(struct machine_check_event *mce, bool release)
- {
- int index = local_paca->mce_info->mce_nest_count - 1;
- struct machine_check_event *mc_evt;
- int ret = 0;
- /* Sanity check */
- if (index < 0)
- return ret;
- /* Check if we have MCE info to process. */
- if (index < MAX_MC_EVT) {
- mc_evt = &local_paca->mce_info->mce_event[index];
- /* Copy the event structure and release the original */
- if (mce)
- *mce = *mc_evt;
- if (release)
- mc_evt->in_use = 0;
- ret = 1;
- }
- /* Decrement the count to free the slot. */
- if (release)
- local_paca->mce_info->mce_nest_count--;
- return ret;
- }
- void release_mce_event(void)
- {
- get_mce_event(NULL, true);
- }
- static void machine_check_ue_work(void)
- {
- schedule_work(&mce_ue_event_work);
- }
- /*
- * Queue up the MCE event which then can be handled later.
- */
- static void machine_check_ue_event(struct machine_check_event *evt)
- {
- int index;
- index = local_paca->mce_info->mce_ue_count++;
- /* If queue is full, just return for now. */
- if (index >= MAX_MC_EVT) {
- local_paca->mce_info->mce_ue_count--;
- return;
- }
- memcpy(&local_paca->mce_info->mce_ue_event_queue[index],
- evt, sizeof(*evt));
- /* Queue work to process this event later. */
- mce_irq_work_queue();
- }
- /*
- * Queue up the MCE event which then can be handled later.
- */
- void machine_check_queue_event(void)
- {
- int index;
- struct machine_check_event evt;
- if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
- return;
- index = local_paca->mce_info->mce_queue_count++;
- /* If queue is full, just return for now. */
- if (index >= MAX_MC_EVT) {
- local_paca->mce_info->mce_queue_count--;
- return;
- }
- memcpy(&local_paca->mce_info->mce_event_queue[index],
- &evt, sizeof(evt));
- mce_irq_work_queue();
- }
- void mce_common_process_ue(struct pt_regs *regs,
- struct mce_error_info *mce_err)
- {
- const struct exception_table_entry *entry;
- entry = search_kernel_exception_table(regs->nip);
- if (entry) {
- mce_err->ignore_event = true;
- regs_set_return_ip(regs, extable_fixup(entry));
- }
- }
- /*
- * process pending MCE event from the mce event queue. This function will be
- * called during syscall exit.
- */
- static void machine_process_ue_event(struct work_struct *work)
- {
- int index;
- struct machine_check_event *evt;
- while (local_paca->mce_info->mce_ue_count > 0) {
- index = local_paca->mce_info->mce_ue_count - 1;
- evt = &local_paca->mce_info->mce_ue_event_queue[index];
- blocking_notifier_call_chain(&mce_notifier_list, 0, evt);
- #ifdef CONFIG_MEMORY_FAILURE
- /*
- * This should probably queued elsewhere, but
- * oh! well
- *
- * Don't report this machine check because the caller has a
- * asked us to ignore the event, it has a fixup handler which
- * will do the appropriate error handling and reporting.
- */
- if (evt->error_type == MCE_ERROR_TYPE_UE) {
- if (evt->u.ue_error.ignore_event) {
- local_paca->mce_info->mce_ue_count--;
- continue;
- }
- if (evt->u.ue_error.physical_address_provided) {
- unsigned long pfn;
- pfn = evt->u.ue_error.physical_address >>
- PAGE_SHIFT;
- memory_failure(pfn, 0);
- } else
- pr_warn("Failed to identify bad address from "
- "where the uncorrectable error (UE) "
- "was generated\n");
- }
- #endif
- local_paca->mce_info->mce_ue_count--;
- }
- }
- /*
- * process pending MCE event from the mce event queue. This function will be
- * called during syscall exit.
- */
- static void machine_check_process_queued_event(void)
- {
- int index;
- struct machine_check_event *evt;
- add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
- /*
- * For now just print it to console.
- * TODO: log this error event to FSP or nvram.
- */
- while (local_paca->mce_info->mce_queue_count > 0) {
- index = local_paca->mce_info->mce_queue_count - 1;
- evt = &local_paca->mce_info->mce_event_queue[index];
- if (evt->error_type == MCE_ERROR_TYPE_UE &&
- evt->u.ue_error.ignore_event) {
- local_paca->mce_info->mce_queue_count--;
- continue;
- }
- machine_check_print_event_info(evt, false, false);
- local_paca->mce_info->mce_queue_count--;
- }
- }
- void set_mce_pending_irq_work(void)
- {
- local_paca->mce_pending_irq_work = 1;
- }
- void clear_mce_pending_irq_work(void)
- {
- local_paca->mce_pending_irq_work = 0;
- }
- void mce_run_irq_context_handlers(void)
- {
- if (unlikely(local_paca->mce_pending_irq_work)) {
- if (ppc_md.machine_check_log_err)
- ppc_md.machine_check_log_err();
- machine_check_process_queued_event();
- machine_check_ue_work();
- clear_mce_pending_irq_work();
- }
- }
- void machine_check_print_event_info(struct machine_check_event *evt,
- bool user_mode, bool in_guest)
- {
- const char *level, *sevstr, *subtype, *err_type, *initiator;
- uint64_t ea = 0, pa = 0;
- int n = 0;
- char dar_str[50];
- char pa_str[50];
- static const char *mc_ue_types[] = {
- "Indeterminate",
- "Instruction fetch",
- "Page table walk ifetch",
- "Load/Store",
- "Page table walk Load/Store",
- };
- static const char *mc_slb_types[] = {
- "Indeterminate",
- "Parity",
- "Multihit",
- };
- static const char *mc_erat_types[] = {
- "Indeterminate",
- "Parity",
- "Multihit",
- };
- static const char *mc_tlb_types[] = {
- "Indeterminate",
- "Parity",
- "Multihit",
- };
- static const char *mc_user_types[] = {
- "Indeterminate",
- "tlbie(l) invalid",
- "scv invalid",
- };
- static const char *mc_ra_types[] = {
- "Indeterminate",
- "Instruction fetch (bad)",
- "Instruction fetch (foreign/control memory)",
- "Page table walk ifetch (bad)",
- "Page table walk ifetch (foreign/control memory)",
- "Load (bad)",
- "Store (bad)",
- "Page table walk Load/Store (bad)",
- "Page table walk Load/Store (foreign/control memory)",
- "Load/Store (foreign/control memory)",
- };
- static const char *mc_link_types[] = {
- "Indeterminate",
- "Instruction fetch (timeout)",
- "Page table walk ifetch (timeout)",
- "Load (timeout)",
- "Store (timeout)",
- "Page table walk Load/Store (timeout)",
- };
- static const char *mc_error_class[] = {
- "Unknown",
- "Hardware error",
- "Probable Hardware error (some chance of software cause)",
- "Software error",
- "Probable Software error (some chance of hardware cause)",
- };
- /* Print things out */
- if (evt->version != MCE_V1) {
- pr_err("Machine Check Exception, Unknown event version %d !\n",
- evt->version);
- return;
- }
- switch (evt->severity) {
- case MCE_SEV_NO_ERROR:
- level = KERN_INFO;
- sevstr = "Harmless";
- break;
- case MCE_SEV_WARNING:
- level = KERN_WARNING;
- sevstr = "Warning";
- break;
- case MCE_SEV_SEVERE:
- level = KERN_ERR;
- sevstr = "Severe";
- break;
- case MCE_SEV_FATAL:
- default:
- level = KERN_ERR;
- sevstr = "Fatal";
- break;
- }
- switch(evt->initiator) {
- case MCE_INITIATOR_CPU:
- initiator = "CPU";
- break;
- case MCE_INITIATOR_PCI:
- initiator = "PCI";
- break;
- case MCE_INITIATOR_ISA:
- initiator = "ISA";
- break;
- case MCE_INITIATOR_MEMORY:
- initiator = "Memory";
- break;
- case MCE_INITIATOR_POWERMGM:
- initiator = "Power Management";
- break;
- case MCE_INITIATOR_UNKNOWN:
- default:
- initiator = "Unknown";
- break;
- }
- switch (evt->error_type) {
- case MCE_ERROR_TYPE_UE:
- err_type = "UE";
- subtype = evt->u.ue_error.ue_error_type <
- ARRAY_SIZE(mc_ue_types) ?
- mc_ue_types[evt->u.ue_error.ue_error_type]
- : "Unknown";
- if (evt->u.ue_error.effective_address_provided)
- ea = evt->u.ue_error.effective_address;
- if (evt->u.ue_error.physical_address_provided)
- pa = evt->u.ue_error.physical_address;
- break;
- case MCE_ERROR_TYPE_SLB:
- err_type = "SLB";
- subtype = evt->u.slb_error.slb_error_type <
- ARRAY_SIZE(mc_slb_types) ?
- mc_slb_types[evt->u.slb_error.slb_error_type]
- : "Unknown";
- if (evt->u.slb_error.effective_address_provided)
- ea = evt->u.slb_error.effective_address;
- break;
- case MCE_ERROR_TYPE_ERAT:
- err_type = "ERAT";
- subtype = evt->u.erat_error.erat_error_type <
- ARRAY_SIZE(mc_erat_types) ?
- mc_erat_types[evt->u.erat_error.erat_error_type]
- : "Unknown";
- if (evt->u.erat_error.effective_address_provided)
- ea = evt->u.erat_error.effective_address;
- break;
- case MCE_ERROR_TYPE_TLB:
- err_type = "TLB";
- subtype = evt->u.tlb_error.tlb_error_type <
- ARRAY_SIZE(mc_tlb_types) ?
- mc_tlb_types[evt->u.tlb_error.tlb_error_type]
- : "Unknown";
- if (evt->u.tlb_error.effective_address_provided)
- ea = evt->u.tlb_error.effective_address;
- break;
- case MCE_ERROR_TYPE_USER:
- err_type = "User";
- subtype = evt->u.user_error.user_error_type <
- ARRAY_SIZE(mc_user_types) ?
- mc_user_types[evt->u.user_error.user_error_type]
- : "Unknown";
- if (evt->u.user_error.effective_address_provided)
- ea = evt->u.user_error.effective_address;
- break;
- case MCE_ERROR_TYPE_RA:
- err_type = "Real address";
- subtype = evt->u.ra_error.ra_error_type <
- ARRAY_SIZE(mc_ra_types) ?
- mc_ra_types[evt->u.ra_error.ra_error_type]
- : "Unknown";
- if (evt->u.ra_error.effective_address_provided)
- ea = evt->u.ra_error.effective_address;
- break;
- case MCE_ERROR_TYPE_LINK:
- err_type = "Link";
- subtype = evt->u.link_error.link_error_type <
- ARRAY_SIZE(mc_link_types) ?
- mc_link_types[evt->u.link_error.link_error_type]
- : "Unknown";
- if (evt->u.link_error.effective_address_provided)
- ea = evt->u.link_error.effective_address;
- break;
- case MCE_ERROR_TYPE_DCACHE:
- err_type = "D-Cache";
- subtype = "Unknown";
- break;
- case MCE_ERROR_TYPE_ICACHE:
- err_type = "I-Cache";
- subtype = "Unknown";
- break;
- default:
- case MCE_ERROR_TYPE_UNKNOWN:
- err_type = "Unknown";
- subtype = "";
- break;
- }
- dar_str[0] = pa_str[0] = '\0';
- if (ea && evt->srr0 != ea) {
- /* Load/Store address */
- n = sprintf(dar_str, "DAR: %016llx ", ea);
- if (pa)
- sprintf(dar_str + n, "paddr: %016llx ", pa);
- } else if (pa) {
- sprintf(pa_str, " paddr: %016llx", pa);
- }
- printk("%sMCE: CPU%d: machine check (%s) %s %s %s %s[%s]\n",
- level, evt->cpu, sevstr, in_guest ? "Guest" : "",
- err_type, subtype, dar_str,
- evt->disposition == MCE_DISPOSITION_RECOVERED ?
- "Recovered" : "Not recovered");
- if (in_guest || user_mode) {
- printk("%sMCE: CPU%d: PID: %d Comm: %s %sNIP: [%016llx]%s\n",
- level, evt->cpu, current->pid, current->comm,
- in_guest ? "Guest " : "", evt->srr0, pa_str);
- } else {
- printk("%sMCE: CPU%d: NIP: [%016llx] %pS%s\n",
- level, evt->cpu, evt->srr0, (void *)evt->srr0, pa_str);
- }
- printk("%sMCE: CPU%d: Initiator %s\n", level, evt->cpu, initiator);
- subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ?
- mc_error_class[evt->error_class] : "Unknown";
- printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype);
- #ifdef CONFIG_PPC_64S_HASH_MMU
- /* Display faulty slb contents for SLB errors. */
- if (evt->error_type == MCE_ERROR_TYPE_SLB && !in_guest)
- slb_dump_contents(local_paca->mce_faulty_slbs);
- #endif
- }
- EXPORT_SYMBOL_GPL(machine_check_print_event_info);
- /*
- * This function is called in real mode. Strictly no printk's please.
- *
- * regs->nip and regs->msr contains srr0 and ssr1.
- */
- DEFINE_INTERRUPT_HANDLER_NMI(machine_check_early)
- {
- long handled = 0;
- hv_nmi_check_nonrecoverable(regs);
- /*
- * See if platform is capable of handling machine check.
- */
- if (ppc_md.machine_check_early)
- handled = ppc_md.machine_check_early(regs);
- return handled;
- }
- /* Possible meanings for HMER_DEBUG_TRIG bit being set on POWER9 */
- static enum {
- DTRIG_UNKNOWN,
- DTRIG_VECTOR_CI, /* need to emulate vector CI load instr */
- DTRIG_SUSPEND_ESCAPE, /* need to escape from TM suspend mode */
- } hmer_debug_trig_function;
- static int init_debug_trig_function(void)
- {
- int pvr;
- struct device_node *cpun;
- struct property *prop = NULL;
- const char *str;
- /* First look in the device tree */
- preempt_disable();
- cpun = of_get_cpu_node(smp_processor_id(), NULL);
- if (cpun) {
- of_property_for_each_string(cpun, "ibm,hmi-special-triggers",
- prop, str) {
- if (strcmp(str, "bit17-vector-ci-load") == 0)
- hmer_debug_trig_function = DTRIG_VECTOR_CI;
- else if (strcmp(str, "bit17-tm-suspend-escape") == 0)
- hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
- }
- of_node_put(cpun);
- }
- preempt_enable();
- /* If we found the property, don't look at PVR */
- if (prop)
- goto out;
- pvr = mfspr(SPRN_PVR);
- /* Check for POWER9 Nimbus (scale-out) */
- if ((PVR_VER(pvr) == PVR_POWER9) && (pvr & 0xe000) == 0) {
- /* DD2.2 and later */
- if ((pvr & 0xfff) >= 0x202)
- hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
- /* DD2.0 and DD2.1 - used for vector CI load emulation */
- else if ((pvr & 0xfff) >= 0x200)
- hmer_debug_trig_function = DTRIG_VECTOR_CI;
- }
- out:
- switch (hmer_debug_trig_function) {
- case DTRIG_VECTOR_CI:
- pr_debug("HMI debug trigger used for vector CI load\n");
- break;
- case DTRIG_SUSPEND_ESCAPE:
- pr_debug("HMI debug trigger used for TM suspend escape\n");
- break;
- default:
- break;
- }
- return 0;
- }
- __initcall(init_debug_trig_function);
- /*
- * Handle HMIs that occur as a result of a debug trigger.
- * Return values:
- * -1 means this is not a HMI cause that we know about
- * 0 means no further handling is required
- * 1 means further handling is required
- */
- long hmi_handle_debugtrig(struct pt_regs *regs)
- {
- unsigned long hmer = mfspr(SPRN_HMER);
- long ret = 0;
- /* HMER_DEBUG_TRIG bit is used for various workarounds on P9 */
- if (!((hmer & HMER_DEBUG_TRIG)
- && hmer_debug_trig_function != DTRIG_UNKNOWN))
- return -1;
-
- hmer &= ~HMER_DEBUG_TRIG;
- /* HMER is a write-AND register */
- mtspr(SPRN_HMER, ~HMER_DEBUG_TRIG);
- switch (hmer_debug_trig_function) {
- case DTRIG_VECTOR_CI:
- /*
- * Now to avoid problems with soft-disable we
- * only do the emulation if we are coming from
- * host user space
- */
- if (regs && user_mode(regs))
- ret = local_paca->hmi_p9_special_emu = 1;
- break;
- default:
- break;
- }
- /*
- * See if any other HMI causes remain to be handled
- */
- if (hmer & mfspr(SPRN_HMEER))
- return -1;
- return ret;
- }
- /*
- * Return values:
- */
- DEFINE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode)
- {
- int ret;
- local_paca->hmi_irqs++;
- ret = hmi_handle_debugtrig(regs);
- if (ret >= 0)
- return ret;
- wait_for_subcore_guest_exit();
- if (ppc_md.hmi_exception_early)
- ppc_md.hmi_exception_early(regs);
- wait_for_tb_resync();
- return 1;
- }
- void __init mce_init(void)
- {
- struct mce_info *mce_info;
- u64 limit;
- int i;
- limit = min(ppc64_bolted_size(), ppc64_rma_size);
- for_each_possible_cpu(i) {
- mce_info = memblock_alloc_try_nid(sizeof(*mce_info),
- __alignof__(*mce_info),
- MEMBLOCK_LOW_LIMIT,
- limit, early_cpu_to_node(i));
- if (!mce_info)
- goto err;
- paca_ptrs[i]->mce_info = mce_info;
- }
- return;
- err:
- panic("Failed to allocate memory for MCE event data\n");
- }
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