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bc276ecba1
PPC_INVALIDATE_ERAT is slbia IH=7 which is a new variant introduced with POWER9, and the result is undefined on earlier CPUs. Commits7b9f71f974("powerpc/64s: POWER9 machine check handler") andd4748276ae("powerpc/64s: Improve local TLB flush for boot and MCE on POWER9") caused POWER7/8 code to use this instruction. Remove it. An ERAT flush can be made by invalidatig the SLB, but before POWER9 that requires a flush and rebolt. Fixes:7b9f71f974("powerpc/64s: POWER9 machine check handler") Fixes:d4748276ae("powerpc/64s: Improve local TLB flush for boot and MCE on POWER9") Cc: stable@vger.kernel.org # v4.11+ Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
620 lines
19 KiB
C
620 lines
19 KiB
C
/*
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* Machine check exception handling CPU-side for power7 and power8
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright 2013 IBM Corporation
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* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
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*/
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#undef DEBUG
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#define pr_fmt(fmt) "mce_power: " fmt
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <asm/mmu.h>
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#include <asm/mce.h>
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#include <asm/machdep.h>
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#include <asm/pgtable.h>
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#include <asm/pte-walk.h>
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#include <asm/sstep.h>
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#include <asm/exception-64s.h>
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/*
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* Convert an address related to an mm to a PFN. NOTE: we are in real
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* mode, we could potentially race with page table updates.
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*/
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static unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
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{
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pte_t *ptep;
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unsigned long flags;
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struct mm_struct *mm;
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if (user_mode(regs))
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mm = current->mm;
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else
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mm = &init_mm;
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local_irq_save(flags);
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if (mm == current->mm)
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ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
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else
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ptep = find_init_mm_pte(addr, NULL);
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local_irq_restore(flags);
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if (!ptep || pte_special(*ptep))
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return ULONG_MAX;
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return pte_pfn(*ptep);
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}
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/* flush SLBs and reload */
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#ifdef CONFIG_PPC_BOOK3S_64
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void flush_and_reload_slb(void)
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{
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/* Invalidate all SLBs */
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slb_flush_all_realmode();
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#ifdef CONFIG_KVM_BOOK3S_HANDLER
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/*
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* If machine check is hit when in guest or in transition, we will
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* only flush the SLBs and continue.
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*/
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if (get_paca()->kvm_hstate.in_guest)
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return;
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#endif
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if (early_radix_enabled())
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return;
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/*
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* This probably shouldn't happen, but it may be possible it's
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* called in early boot before SLB shadows are allocated.
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*/
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if (!get_slb_shadow())
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return;
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slb_restore_bolted_realmode();
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}
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#endif
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static void flush_erat(void)
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{
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#ifdef CONFIG_PPC_BOOK3S_64
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if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) {
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flush_and_reload_slb();
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return;
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}
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#endif
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/* PPC_INVALIDATE_ERAT can only be used on ISA v3 and newer */
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asm volatile(PPC_INVALIDATE_ERAT : : :"memory");
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}
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#define MCE_FLUSH_SLB 1
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#define MCE_FLUSH_TLB 2
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#define MCE_FLUSH_ERAT 3
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static int mce_flush(int what)
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{
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#ifdef CONFIG_PPC_BOOK3S_64
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if (what == MCE_FLUSH_SLB) {
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flush_and_reload_slb();
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return 1;
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}
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#endif
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if (what == MCE_FLUSH_ERAT) {
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flush_erat();
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return 1;
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}
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if (what == MCE_FLUSH_TLB) {
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tlbiel_all();
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return 1;
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}
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return 0;
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}
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#define SRR1_MC_LOADSTORE(srr1) ((srr1) & PPC_BIT(42))
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struct mce_ierror_table {
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unsigned long srr1_mask;
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unsigned long srr1_value;
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bool nip_valid; /* nip is a valid indicator of faulting address */
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unsigned int error_type;
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unsigned int error_subtype;
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unsigned int initiator;
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unsigned int severity;
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};
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static const struct mce_ierror_table mce_p7_ierror_table[] = {
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{ 0x00000000001c0000, 0x0000000000040000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x0000000000080000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x00000000000c0000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x0000000000100000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x0000000000140000, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x0000000000180000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000001c0000, 0x00000000001c0000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, 0, 0, 0, 0, 0 } };
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static const struct mce_ierror_table mce_p8_ierror_table[] = {
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{ 0x00000000081c0000, 0x0000000000040000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000080000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x00000000000c0000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000100000, true,
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MCE_ERROR_TYPE_ERAT,MCE_ERAT_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000140000, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000180000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x00000000001c0000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008000000, true,
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MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_IFETCH_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008040000, true,
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MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, 0, 0, 0, 0, 0 } };
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static const struct mce_ierror_table mce_p9_ierror_table[] = {
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{ 0x00000000081c0000, 0x0000000000040000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000080000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x00000000000c0000, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000100000, true,
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MCE_ERROR_TYPE_ERAT,MCE_ERAT_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000140000, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000000180000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x00000000001c0000, true,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008000000, true,
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MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_IFETCH_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008040000, true,
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MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_PAGE_TABLE_WALK_IFETCH_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x00000000080c0000, true,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008100000, true,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000000081c0000, 0x0000000008140000, false,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_FATAL, }, /* ASYNC is fatal */
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{ 0x00000000081c0000, 0x0000000008180000, false,
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MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_STORE_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_FATAL, }, /* ASYNC is fatal */
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{ 0x00000000081c0000, 0x00000000081c0000, true,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, 0, 0, 0, 0, 0 } };
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struct mce_derror_table {
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unsigned long dsisr_value;
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bool dar_valid; /* dar is a valid indicator of faulting address */
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unsigned int error_type;
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unsigned int error_subtype;
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unsigned int initiator;
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unsigned int severity;
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};
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static const struct mce_derror_table mce_p7_derror_table[] = {
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{ 0x00008000, false,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00004000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000800, true,
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MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000400, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000080, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000100, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000040, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_INDETERMINATE, /* BOTH */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, false, 0, 0, 0, 0 } };
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static const struct mce_derror_table mce_p8_derror_table[] = {
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{ 0x00008000, false,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00004000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00002000, true,
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MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00001000, true,
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MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000800, true,
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MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000400, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000200, true,
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MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, /* SECONDARY ERAT */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000080, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000100, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, false, 0, 0, 0, 0 } };
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static const struct mce_derror_table mce_p9_derror_table[] = {
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{ 0x00008000, false,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00004000, true,
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MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00002000, true,
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MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00001000, true,
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MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000800, true,
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MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000400, true,
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MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000200, false,
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MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000080, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT, /* Before PARITY */
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000100, true,
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MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000040, true,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000020, false,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000010, false,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0x00000008, false,
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MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN,
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MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
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{ 0, false, 0, 0, 0, 0 } };
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static int mce_find_instr_ea_and_pfn(struct pt_regs *regs, uint64_t *addr,
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uint64_t *phys_addr)
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{
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/*
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* Carefully look at the NIP to determine
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* the instruction to analyse. Reading the NIP
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* in real-mode is tricky and can lead to recursive
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* faults
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*/
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int instr;
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unsigned long pfn, instr_addr;
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struct instruction_op op;
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struct pt_regs tmp = *regs;
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pfn = addr_to_pfn(regs, regs->nip);
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if (pfn != ULONG_MAX) {
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instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK);
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instr = *(unsigned int *)(instr_addr);
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if (!analyse_instr(&op, &tmp, instr)) {
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pfn = addr_to_pfn(regs, op.ea);
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*addr = op.ea;
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*phys_addr = (pfn << PAGE_SHIFT);
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return 0;
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}
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/*
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* analyse_instr() might fail if the instruction
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* is not a load/store, although this is unexpected
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* for load/store errors or if we got the NIP
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* wrong
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*/
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}
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*addr = 0;
|
|
return -1;
|
|
}
|
|
|
|
static int mce_handle_ierror(struct pt_regs *regs,
|
|
const struct mce_ierror_table table[],
|
|
struct mce_error_info *mce_err, uint64_t *addr,
|
|
uint64_t *phys_addr)
|
|
{
|
|
uint64_t srr1 = regs->msr;
|
|
int handled = 0;
|
|
int i;
|
|
|
|
*addr = 0;
|
|
|
|
for (i = 0; table[i].srr1_mask; i++) {
|
|
if ((srr1 & table[i].srr1_mask) != table[i].srr1_value)
|
|
continue;
|
|
|
|
/* attempt to correct the error */
|
|
switch (table[i].error_type) {
|
|
case MCE_ERROR_TYPE_SLB:
|
|
handled = mce_flush(MCE_FLUSH_SLB);
|
|
break;
|
|
case MCE_ERROR_TYPE_ERAT:
|
|
handled = mce_flush(MCE_FLUSH_ERAT);
|
|
break;
|
|
case MCE_ERROR_TYPE_TLB:
|
|
handled = mce_flush(MCE_FLUSH_TLB);
|
|
break;
|
|
}
|
|
|
|
/* now fill in mce_error_info */
|
|
mce_err->error_type = table[i].error_type;
|
|
switch (table[i].error_type) {
|
|
case MCE_ERROR_TYPE_UE:
|
|
mce_err->u.ue_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_SLB:
|
|
mce_err->u.slb_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_ERAT:
|
|
mce_err->u.erat_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_TLB:
|
|
mce_err->u.tlb_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_USER:
|
|
mce_err->u.user_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_RA:
|
|
mce_err->u.ra_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_LINK:
|
|
mce_err->u.link_error_type = table[i].error_subtype;
|
|
break;
|
|
}
|
|
mce_err->severity = table[i].severity;
|
|
mce_err->initiator = table[i].initiator;
|
|
if (table[i].nip_valid) {
|
|
*addr = regs->nip;
|
|
if (mce_err->severity == MCE_SEV_ERROR_SYNC &&
|
|
table[i].error_type == MCE_ERROR_TYPE_UE) {
|
|
unsigned long pfn;
|
|
|
|
if (get_paca()->in_mce < MAX_MCE_DEPTH) {
|
|
pfn = addr_to_pfn(regs, regs->nip);
|
|
if (pfn != ULONG_MAX) {
|
|
*phys_addr =
|
|
(pfn << PAGE_SHIFT);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN;
|
|
mce_err->severity = MCE_SEV_ERROR_SYNC;
|
|
mce_err->initiator = MCE_INITIATOR_CPU;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mce_handle_derror(struct pt_regs *regs,
|
|
const struct mce_derror_table table[],
|
|
struct mce_error_info *mce_err, uint64_t *addr,
|
|
uint64_t *phys_addr)
|
|
{
|
|
uint64_t dsisr = regs->dsisr;
|
|
int handled = 0;
|
|
int found = 0;
|
|
int i;
|
|
|
|
*addr = 0;
|
|
|
|
for (i = 0; table[i].dsisr_value; i++) {
|
|
if (!(dsisr & table[i].dsisr_value))
|
|
continue;
|
|
|
|
/* attempt to correct the error */
|
|
switch (table[i].error_type) {
|
|
case MCE_ERROR_TYPE_SLB:
|
|
if (mce_flush(MCE_FLUSH_SLB))
|
|
handled = 1;
|
|
break;
|
|
case MCE_ERROR_TYPE_ERAT:
|
|
if (mce_flush(MCE_FLUSH_ERAT))
|
|
handled = 1;
|
|
break;
|
|
case MCE_ERROR_TYPE_TLB:
|
|
if (mce_flush(MCE_FLUSH_TLB))
|
|
handled = 1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Attempt to handle multiple conditions, but only return
|
|
* one. Ensure uncorrectable errors are first in the table
|
|
* to match.
|
|
*/
|
|
if (found)
|
|
continue;
|
|
|
|
/* now fill in mce_error_info */
|
|
mce_err->error_type = table[i].error_type;
|
|
switch (table[i].error_type) {
|
|
case MCE_ERROR_TYPE_UE:
|
|
mce_err->u.ue_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_SLB:
|
|
mce_err->u.slb_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_ERAT:
|
|
mce_err->u.erat_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_TLB:
|
|
mce_err->u.tlb_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_USER:
|
|
mce_err->u.user_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_RA:
|
|
mce_err->u.ra_error_type = table[i].error_subtype;
|
|
break;
|
|
case MCE_ERROR_TYPE_LINK:
|
|
mce_err->u.link_error_type = table[i].error_subtype;
|
|
break;
|
|
}
|
|
mce_err->severity = table[i].severity;
|
|
mce_err->initiator = table[i].initiator;
|
|
if (table[i].dar_valid)
|
|
*addr = regs->dar;
|
|
else if (mce_err->severity == MCE_SEV_ERROR_SYNC &&
|
|
table[i].error_type == MCE_ERROR_TYPE_UE) {
|
|
/*
|
|
* We do a maximum of 4 nested MCE calls, see
|
|
* kernel/exception-64s.h
|
|
*/
|
|
if (get_paca()->in_mce < MAX_MCE_DEPTH)
|
|
mce_find_instr_ea_and_pfn(regs, addr, phys_addr);
|
|
}
|
|
found = 1;
|
|
}
|
|
|
|
if (found)
|
|
return handled;
|
|
|
|
mce_err->error_type = MCE_ERROR_TYPE_UNKNOWN;
|
|
mce_err->severity = MCE_SEV_ERROR_SYNC;
|
|
mce_err->initiator = MCE_INITIATOR_CPU;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long mce_handle_ue_error(struct pt_regs *regs)
|
|
{
|
|
long handled = 0;
|
|
|
|
/*
|
|
* On specific SCOM read via MMIO we may get a machine check
|
|
* exception with SRR0 pointing inside opal. If that is the
|
|
* case OPAL may have recovery address to re-read SCOM data in
|
|
* different way and hence we can recover from this MC.
|
|
*/
|
|
|
|
if (ppc_md.mce_check_early_recovery) {
|
|
if (ppc_md.mce_check_early_recovery(regs))
|
|
handled = 1;
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
static long mce_handle_error(struct pt_regs *regs,
|
|
const struct mce_derror_table dtable[],
|
|
const struct mce_ierror_table itable[])
|
|
{
|
|
struct mce_error_info mce_err = { 0 };
|
|
uint64_t addr, phys_addr = ULONG_MAX;
|
|
uint64_t srr1 = regs->msr;
|
|
long handled;
|
|
|
|
if (SRR1_MC_LOADSTORE(srr1))
|
|
handled = mce_handle_derror(regs, dtable, &mce_err, &addr,
|
|
&phys_addr);
|
|
else
|
|
handled = mce_handle_ierror(regs, itable, &mce_err, &addr,
|
|
&phys_addr);
|
|
|
|
if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE)
|
|
handled = mce_handle_ue_error(regs);
|
|
|
|
save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr);
|
|
|
|
return handled;
|
|
}
|
|
|
|
long __machine_check_early_realmode_p7(struct pt_regs *regs)
|
|
{
|
|
/* P7 DD1 leaves top bits of DSISR undefined */
|
|
regs->dsisr &= 0x0000ffff;
|
|
|
|
return mce_handle_error(regs, mce_p7_derror_table, mce_p7_ierror_table);
|
|
}
|
|
|
|
long __machine_check_early_realmode_p8(struct pt_regs *regs)
|
|
{
|
|
return mce_handle_error(regs, mce_p8_derror_table, mce_p8_ierror_table);
|
|
}
|
|
|
|
long __machine_check_early_realmode_p9(struct pt_regs *regs)
|
|
{
|
|
/*
|
|
* On POWER9 DD2.1 and below, it's possible to get a machine check
|
|
* caused by a paste instruction where only DSISR bit 25 is set. This
|
|
* will result in the MCE handler seeing an unknown event and the kernel
|
|
* crashing. An MCE that occurs like this is spurious, so we don't need
|
|
* to do anything in terms of servicing it. If there is something that
|
|
* needs to be serviced, the CPU will raise the MCE again with the
|
|
* correct DSISR so that it can be serviced properly. So detect this
|
|
* case and mark it as handled.
|
|
*/
|
|
if (SRR1_MC_LOADSTORE(regs->msr) && regs->dsisr == 0x02000000)
|
|
return 1;
|
|
|
|
return mce_handle_error(regs, mce_p9_derror_table, mce_p9_ierror_table);
|
|
}
|