^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Machine check exception handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2013 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #undef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) "mce: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/irq_work.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/mce.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_PER_CPU(int, mce_nest_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* Queue for delayed MCE events. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static DEFINE_PER_CPU(int, mce_queue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* Queue for delayed MCE UE events. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static DEFINE_PER_CPU(int, mce_ue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) mce_ue_event_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static void machine_check_process_queued_event(struct irq_work *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static void machine_check_ue_irq_work(struct irq_work *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static void machine_check_ue_event(struct machine_check_event *evt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static void machine_process_ue_event(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static struct irq_work mce_event_process_work = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .func = machine_check_process_queued_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static struct irq_work mce_ue_event_irq_work = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .func = machine_check_ue_irq_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static BLOCKING_NOTIFIER_HEAD(mce_notifier_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int mce_register_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return blocking_notifier_chain_register(&mce_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) EXPORT_SYMBOL_GPL(mce_register_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int mce_unregister_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return blocking_notifier_chain_unregister(&mce_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) EXPORT_SYMBOL_GPL(mce_unregister_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static void mce_set_error_info(struct machine_check_event *mce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct mce_error_info *mce_err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) mce->error_type = mce_err->error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) switch (mce_err->error_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) case MCE_ERROR_TYPE_UE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) mce->u.ue_error.ue_error_type = mce_err->u.ue_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) case MCE_ERROR_TYPE_SLB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) mce->u.slb_error.slb_error_type = mce_err->u.slb_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) case MCE_ERROR_TYPE_ERAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) mce->u.erat_error.erat_error_type = mce_err->u.erat_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) case MCE_ERROR_TYPE_TLB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) mce->u.tlb_error.tlb_error_type = mce_err->u.tlb_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) case MCE_ERROR_TYPE_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mce->u.user_error.user_error_type = mce_err->u.user_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) case MCE_ERROR_TYPE_RA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) mce->u.ra_error.ra_error_type = mce_err->u.ra_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) case MCE_ERROR_TYPE_LINK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) mce->u.link_error.link_error_type = mce_err->u.link_error_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) case MCE_ERROR_TYPE_UNKNOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * Decode and save high level MCE information into per cpu buffer which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * is an array of machine_check_event structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) void save_mce_event(struct pt_regs *regs, long handled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct mce_error_info *mce_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) uint64_t nip, uint64_t addr, uint64_t phys_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int index = __this_cpu_inc_return(mce_nest_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct machine_check_event *mce = this_cpu_ptr(&mce_event[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Return if we don't have enough space to log mce event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * mce_nest_count may go beyond MAX_MC_EVT but that's ok,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * the check below will stop buffer overrun.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (index >= MAX_MC_EVT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* Populate generic machine check info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) mce->version = MCE_V1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mce->srr0 = nip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) mce->srr1 = regs->msr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) mce->gpr3 = regs->gpr[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) mce->in_use = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) mce->cpu = get_paca()->paca_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* Mark it recovered if we have handled it and MSR(RI=1). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (handled && (regs->msr & MSR_RI))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) mce->disposition = MCE_DISPOSITION_RECOVERED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) mce->disposition = MCE_DISPOSITION_NOT_RECOVERED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) mce->initiator = mce_err->initiator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) mce->severity = mce_err->severity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) mce->sync_error = mce_err->sync_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) mce->error_class = mce_err->error_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * Populate the mce error_type and type-specific error_type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) mce_set_error_info(mce, mce_err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (!addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (mce->error_type == MCE_ERROR_TYPE_TLB) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) mce->u.tlb_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mce->u.tlb_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } else if (mce->error_type == MCE_ERROR_TYPE_SLB) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) mce->u.slb_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) mce->u.slb_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) } else if (mce->error_type == MCE_ERROR_TYPE_ERAT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) mce->u.erat_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) mce->u.erat_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) } else if (mce->error_type == MCE_ERROR_TYPE_USER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) mce->u.user_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) mce->u.user_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } else if (mce->error_type == MCE_ERROR_TYPE_RA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) mce->u.ra_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) mce->u.ra_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) } else if (mce->error_type == MCE_ERROR_TYPE_LINK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) mce->u.link_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mce->u.link_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) } else if (mce->error_type == MCE_ERROR_TYPE_UE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) mce->u.ue_error.effective_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) mce->u.ue_error.effective_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (phys_addr != ULONG_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) mce->u.ue_error.physical_address_provided = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) mce->u.ue_error.physical_address = phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) mce->u.ue_error.ignore_event = mce_err->ignore_event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) machine_check_ue_event(mce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * get_mce_event:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * mce Pointer to machine_check_event structure to be filled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * release Flag to indicate whether to free the event slot or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * 0 <= do not release the mce event. Caller will invoke
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * release_mce_event() once event has been consumed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * 1 <= release the slot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * return 1 = success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * 0 = failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * get_mce_event() will be called by platform specific machine check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * handle routine and in KVM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * When we call get_mce_event(), we are still in interrupt context and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * preemption will not be scheduled until ret_from_expect() routine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * is called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int get_mce_event(struct machine_check_event *mce, bool release)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int index = __this_cpu_read(mce_nest_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct machine_check_event *mc_evt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Sanity check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (index < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* Check if we have MCE info to process. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (index < MAX_MC_EVT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) mc_evt = this_cpu_ptr(&mce_event[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) /* Copy the event structure and release the original */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (mce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) *mce = *mc_evt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (release)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) mc_evt->in_use = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /* Decrement the count to free the slot. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (release)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) __this_cpu_dec(mce_nest_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) void release_mce_event(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) get_mce_event(NULL, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static void machine_check_ue_irq_work(struct irq_work *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) schedule_work(&mce_ue_event_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Queue up the MCE event which then can be handled later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static void machine_check_ue_event(struct machine_check_event *evt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) index = __this_cpu_inc_return(mce_ue_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* If queue is full, just return for now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (index >= MAX_MC_EVT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) __this_cpu_dec(mce_ue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) memcpy(this_cpu_ptr(&mce_ue_event_queue[index]), evt, sizeof(*evt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* Queue work to process this event later. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) irq_work_queue(&mce_ue_event_irq_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * Queue up the MCE event which then can be handled later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) void machine_check_queue_event(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct machine_check_event evt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) index = __this_cpu_inc_return(mce_queue_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /* If queue is full, just return for now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (index >= MAX_MC_EVT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) __this_cpu_dec(mce_queue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) memcpy(this_cpu_ptr(&mce_event_queue[index]), &evt, sizeof(evt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* Queue irq work to process this event later. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) irq_work_queue(&mce_event_process_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) void mce_common_process_ue(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) struct mce_error_info *mce_err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) const struct exception_table_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) entry = search_kernel_exception_table(regs->nip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) mce_err->ignore_event = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) regs->nip = extable_fixup(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * process pending MCE event from the mce event queue. This function will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * called during syscall exit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static void machine_process_ue_event(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct machine_check_event *evt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) while (__this_cpu_read(mce_ue_count) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) index = __this_cpu_read(mce_ue_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) evt = this_cpu_ptr(&mce_ue_event_queue[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) blocking_notifier_call_chain(&mce_notifier_list, 0, evt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) #ifdef CONFIG_MEMORY_FAILURE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * This should probably queued elsewhere, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * oh! well
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * Don't report this machine check because the caller has a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * asked us to ignore the event, it has a fixup handler which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * will do the appropriate error handling and reporting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (evt->error_type == MCE_ERROR_TYPE_UE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (evt->u.ue_error.ignore_event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) __this_cpu_dec(mce_ue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (evt->u.ue_error.physical_address_provided) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) pfn = evt->u.ue_error.physical_address >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) memory_failure(pfn, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) pr_warn("Failed to identify bad address from "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) "where the uncorrectable error (UE) "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) "was generated\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) __this_cpu_dec(mce_ue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * process pending MCE event from the mce event queue. This function will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * called during syscall exit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static void machine_check_process_queued_event(struct irq_work *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) struct machine_check_event *evt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * For now just print it to console.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * TODO: log this error event to FSP or nvram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) while (__this_cpu_read(mce_queue_count) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) index = __this_cpu_read(mce_queue_count) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) evt = this_cpu_ptr(&mce_event_queue[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (evt->error_type == MCE_ERROR_TYPE_UE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) evt->u.ue_error.ignore_event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) __this_cpu_dec(mce_queue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) machine_check_print_event_info(evt, false, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) __this_cpu_dec(mce_queue_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) void machine_check_print_event_info(struct machine_check_event *evt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) bool user_mode, bool in_guest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) const char *level, *sevstr, *subtype, *err_type, *initiator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) uint64_t ea = 0, pa = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) char dar_str[50];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) char pa_str[50];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static const char *mc_ue_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) "Instruction fetch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) "Page table walk ifetch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) "Load/Store",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) "Page table walk Load/Store",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static const char *mc_slb_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) "Parity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) "Multihit",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static const char *mc_erat_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) "Parity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) "Multihit",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static const char *mc_tlb_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) "Parity",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) "Multihit",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static const char *mc_user_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) "tlbie(l) invalid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) "scv invalid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static const char *mc_ra_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) "Instruction fetch (bad)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) "Instruction fetch (foreign)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) "Page table walk ifetch (bad)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) "Page table walk ifetch (foreign)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) "Load (bad)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) "Store (bad)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) "Page table walk Load/Store (bad)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) "Page table walk Load/Store (foreign)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) "Load/Store (foreign)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) static const char *mc_link_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) "Indeterminate",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) "Instruction fetch (timeout)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) "Page table walk ifetch (timeout)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) "Load (timeout)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) "Store (timeout)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) "Page table walk Load/Store (timeout)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static const char *mc_error_class[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) "Unknown",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) "Hardware error",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) "Probable Hardware error (some chance of software cause)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) "Software error",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) "Probable Software error (some chance of hardware cause)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* Print things out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (evt->version != MCE_V1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) pr_err("Machine Check Exception, Unknown event version %d !\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) evt->version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) switch (evt->severity) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) case MCE_SEV_NO_ERROR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) level = KERN_INFO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) sevstr = "Harmless";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) case MCE_SEV_WARNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) level = KERN_WARNING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) sevstr = "Warning";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) case MCE_SEV_SEVERE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) level = KERN_ERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) sevstr = "Severe";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) case MCE_SEV_FATAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) level = KERN_ERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) sevstr = "Fatal";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) switch(evt->initiator) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) case MCE_INITIATOR_CPU:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) initiator = "CPU";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) case MCE_INITIATOR_PCI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) initiator = "PCI";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) case MCE_INITIATOR_ISA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) initiator = "ISA";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) case MCE_INITIATOR_MEMORY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) initiator = "Memory";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) case MCE_INITIATOR_POWERMGM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) initiator = "Power Management";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) case MCE_INITIATOR_UNKNOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) initiator = "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) switch (evt->error_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) case MCE_ERROR_TYPE_UE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) err_type = "UE";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) subtype = evt->u.ue_error.ue_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) ARRAY_SIZE(mc_ue_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) mc_ue_types[evt->u.ue_error.ue_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (evt->u.ue_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ea = evt->u.ue_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (evt->u.ue_error.physical_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) pa = evt->u.ue_error.physical_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) case MCE_ERROR_TYPE_SLB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) err_type = "SLB";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) subtype = evt->u.slb_error.slb_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) ARRAY_SIZE(mc_slb_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) mc_slb_types[evt->u.slb_error.slb_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (evt->u.slb_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) ea = evt->u.slb_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) case MCE_ERROR_TYPE_ERAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) err_type = "ERAT";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) subtype = evt->u.erat_error.erat_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) ARRAY_SIZE(mc_erat_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) mc_erat_types[evt->u.erat_error.erat_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (evt->u.erat_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) ea = evt->u.erat_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) case MCE_ERROR_TYPE_TLB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) err_type = "TLB";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) subtype = evt->u.tlb_error.tlb_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) ARRAY_SIZE(mc_tlb_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) mc_tlb_types[evt->u.tlb_error.tlb_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (evt->u.tlb_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) ea = evt->u.tlb_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) case MCE_ERROR_TYPE_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) err_type = "User";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) subtype = evt->u.user_error.user_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) ARRAY_SIZE(mc_user_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) mc_user_types[evt->u.user_error.user_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (evt->u.user_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ea = evt->u.user_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) case MCE_ERROR_TYPE_RA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) err_type = "Real address";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) subtype = evt->u.ra_error.ra_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) ARRAY_SIZE(mc_ra_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) mc_ra_types[evt->u.ra_error.ra_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (evt->u.ra_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) ea = evt->u.ra_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) case MCE_ERROR_TYPE_LINK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) err_type = "Link";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) subtype = evt->u.link_error.link_error_type <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) ARRAY_SIZE(mc_link_types) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) mc_link_types[evt->u.link_error.link_error_type]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (evt->u.link_error.effective_address_provided)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) ea = evt->u.link_error.effective_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) case MCE_ERROR_TYPE_DCACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) err_type = "D-Cache";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) subtype = "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) case MCE_ERROR_TYPE_ICACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) err_type = "I-Cache";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) subtype = "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) case MCE_ERROR_TYPE_UNKNOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) err_type = "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) subtype = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) dar_str[0] = pa_str[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (ea && evt->srr0 != ea) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* Load/Store address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) n = sprintf(dar_str, "DAR: %016llx ", ea);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (pa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) sprintf(dar_str + n, "paddr: %016llx ", pa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) } else if (pa) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) sprintf(pa_str, " paddr: %016llx", pa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) printk("%sMCE: CPU%d: machine check (%s) %s %s %s %s[%s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) level, evt->cpu, sevstr, in_guest ? "Guest" : "Host",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) err_type, subtype, dar_str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) evt->disposition == MCE_DISPOSITION_RECOVERED ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) "Recovered" : "Not recovered");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) if (in_guest || user_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) printk("%sMCE: CPU%d: PID: %d Comm: %s %sNIP: [%016llx]%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) level, evt->cpu, current->pid, current->comm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) in_guest ? "Guest " : "", evt->srr0, pa_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) printk("%sMCE: CPU%d: NIP: [%016llx] %pS%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) level, evt->cpu, evt->srr0, (void *)evt->srr0, pa_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) printk("%sMCE: CPU%d: Initiator %s\n", level, evt->cpu, initiator);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) mc_error_class[evt->error_class] : "Unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) #ifdef CONFIG_PPC_BOOK3S_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) /* Display faulty slb contents for SLB errors. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) if (evt->error_type == MCE_ERROR_TYPE_SLB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) slb_dump_contents(local_paca->mce_faulty_slbs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) EXPORT_SYMBOL_GPL(machine_check_print_event_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * This function is called in real mode. Strictly no printk's please.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * regs->nip and regs->msr contains srr0 and ssr1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) long notrace machine_check_early(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) long handled = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) u8 ftrace_enabled = this_cpu_get_ftrace_enabled();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) this_cpu_set_ftrace_enabled(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /* Do not use nmi_enter/exit for pseries hpte guest */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) nmi_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) hv_nmi_check_nonrecoverable(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) * See if platform is capable of handling machine check.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (ppc_md.machine_check_early)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) handled = ppc_md.machine_check_early(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) nmi_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) this_cpu_set_ftrace_enabled(ftrace_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) return handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) /* Possible meanings for HMER_DEBUG_TRIG bit being set on POWER9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) static enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) DTRIG_UNKNOWN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) DTRIG_VECTOR_CI, /* need to emulate vector CI load instr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) DTRIG_SUSPEND_ESCAPE, /* need to escape from TM suspend mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) } hmer_debug_trig_function;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) static int init_debug_trig_function(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) int pvr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct device_node *cpun;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) struct property *prop = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) const char *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) /* First look in the device tree */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) cpun = of_get_cpu_node(smp_processor_id(), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (cpun) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) of_property_for_each_string(cpun, "ibm,hmi-special-triggers",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) prop, str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) if (strcmp(str, "bit17-vector-ci-load") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) hmer_debug_trig_function = DTRIG_VECTOR_CI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) else if (strcmp(str, "bit17-tm-suspend-escape") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) of_node_put(cpun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) /* If we found the property, don't look at PVR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) if (prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) pvr = mfspr(SPRN_PVR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) /* Check for POWER9 Nimbus (scale-out) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if ((PVR_VER(pvr) == PVR_POWER9) && (pvr & 0xe000) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) /* DD2.2 and later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if ((pvr & 0xfff) >= 0x202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) hmer_debug_trig_function = DTRIG_SUSPEND_ESCAPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) /* DD2.0 and DD2.1 - used for vector CI load emulation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) else if ((pvr & 0xfff) >= 0x200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) hmer_debug_trig_function = DTRIG_VECTOR_CI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) switch (hmer_debug_trig_function) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) case DTRIG_VECTOR_CI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) pr_debug("HMI debug trigger used for vector CI load\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) case DTRIG_SUSPEND_ESCAPE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) pr_debug("HMI debug trigger used for TM suspend escape\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) __initcall(init_debug_trig_function);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * Handle HMIs that occur as a result of a debug trigger.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * Return values:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * -1 means this is not a HMI cause that we know about
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * 0 means no further handling is required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * 1 means further handling is required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) long hmi_handle_debugtrig(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) unsigned long hmer = mfspr(SPRN_HMER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) long ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) /* HMER_DEBUG_TRIG bit is used for various workarounds on P9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) if (!((hmer & HMER_DEBUG_TRIG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) && hmer_debug_trig_function != DTRIG_UNKNOWN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) hmer &= ~HMER_DEBUG_TRIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) /* HMER is a write-AND register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) mtspr(SPRN_HMER, ~HMER_DEBUG_TRIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) switch (hmer_debug_trig_function) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) case DTRIG_VECTOR_CI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) * Now to avoid problems with soft-disable we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * only do the emulation if we are coming from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * host user space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (regs && user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) ret = local_paca->hmi_p9_special_emu = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * See if any other HMI causes remain to be handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (hmer & mfspr(SPRN_HMEER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * Return values:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) long hmi_exception_realmode(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) local_paca->hmi_irqs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) ret = hmi_handle_debugtrig(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) if (ret >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) wait_for_subcore_guest_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) if (ppc_md.hmi_exception_early)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) ppc_md.hmi_exception_early(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) wait_for_tb_resync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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