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4e00374704
CONFIG_PPC_STD_MMU_64 indicates support for the "standard" powerpc MMU on 64-bit CPUs. The "standard" MMU refers to the hash page table MMU found in "server" processors, from IBM mainly. Currently CONFIG_PPC_STD_MMU_64 is == CONFIG_PPC_BOOK3S_64. While it's annoying to have two symbols that always have the same value, it's not quite annoying enough to bother removing one. However with the arrival of Power9, we now have the situation where CONFIG_PPC_STD_MMU_64 is enabled, but the kernel is running using the Radix MMU - *not* the "standard" MMU. So it is now actively confusing to use it, because it implies that code is disabled or inactive when the Radix MMU is in use, however that is not necessarily true. So s/CONFIG_PPC_STD_MMU_64/CONFIG_PPC_BOOK3S_64/, and do some minor formatting updates of some of the affected lines. This will be a pain for backports, but c'est la vie. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
722 lines
21 KiB
C
722 lines
21 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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static void flush_tlb_206(unsigned int num_sets, unsigned int action)
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{
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unsigned long rb;
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unsigned int i;
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switch (action) {
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case TLB_INVAL_SCOPE_GLOBAL:
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rb = TLBIEL_INVAL_SET;
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break;
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case TLB_INVAL_SCOPE_LPID:
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rb = TLBIEL_INVAL_SET_LPID;
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break;
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default:
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BUG();
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break;
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}
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asm volatile("ptesync" : : : "memory");
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for (i = 0; i < num_sets; i++) {
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asm volatile("tlbiel %0" : : "r" (rb));
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rb += 1 << TLBIEL_INVAL_SET_SHIFT;
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}
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asm volatile("ptesync" : : : "memory");
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}
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static void flush_tlb_300(unsigned int num_sets, unsigned int action)
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{
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unsigned long rb;
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unsigned int i;
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unsigned int r;
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switch (action) {
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case TLB_INVAL_SCOPE_GLOBAL:
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rb = TLBIEL_INVAL_SET;
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break;
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case TLB_INVAL_SCOPE_LPID:
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rb = TLBIEL_INVAL_SET_LPID;
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break;
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default:
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BUG();
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break;
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}
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asm volatile("ptesync" : : : "memory");
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if (early_radix_enabled())
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r = 1;
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else
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r = 0;
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/*
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* First flush table/PWC caches with set 0, then flush the
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* rest of the sets, partition scope. Radix must then do it
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* all again with process scope. Hash just has to flush
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* process table.
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*/
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asm volatile(PPC_TLBIEL(%0, %1, %2, %3, %4) : :
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"r"(rb), "r"(0), "i"(2), "i"(0), "r"(r));
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for (i = 1; i < num_sets; i++) {
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unsigned long set = i * (1<<TLBIEL_INVAL_SET_SHIFT);
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asm volatile(PPC_TLBIEL(%0, %1, %2, %3, %4) : :
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"r"(rb+set), "r"(0), "i"(2), "i"(0), "r"(r));
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}
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asm volatile(PPC_TLBIEL(%0, %1, %2, %3, %4) : :
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"r"(rb), "r"(0), "i"(2), "i"(1), "r"(r));
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if (early_radix_enabled()) {
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for (i = 1; i < num_sets; i++) {
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unsigned long set = i * (1<<TLBIEL_INVAL_SET_SHIFT);
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asm volatile(PPC_TLBIEL(%0, %1, %2, %3, %4) : :
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"r"(rb+set), "r"(0), "i"(2), "i"(1), "r"(r));
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}
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}
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asm volatile("ptesync" : : : "memory");
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}
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/*
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* Generic routines to flush TLB on POWER processors. These routines
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* are used as flush_tlb hook in the cpu_spec.
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*
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* action => TLB_INVAL_SCOPE_GLOBAL: Invalidate all TLBs.
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* TLB_INVAL_SCOPE_LPID: Invalidate TLB for current LPID.
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*/
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void __flush_tlb_power7(unsigned int action)
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{
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flush_tlb_206(POWER7_TLB_SETS, action);
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}
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void __flush_tlb_power8(unsigned int action)
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{
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flush_tlb_206(POWER8_TLB_SETS, action);
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}
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void __flush_tlb_power9(unsigned int action)
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{
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unsigned int num_sets;
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if (early_radix_enabled())
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num_sets = POWER9_TLB_SETS_RADIX;
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else
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num_sets = POWER9_TLB_SETS_HASH;
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flush_tlb_300(num_sets, action);
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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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static void flush_and_reload_slb(void)
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{
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struct slb_shadow *slb;
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unsigned long i, n;
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/* Invalidate all SLBs */
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asm volatile("slbmte %0,%0; slbia" : : "r" (0));
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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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/* For host kernel, reload the SLBs from shadow SLB buffer. */
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slb = get_slb_shadow();
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if (!slb)
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return;
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n = min_t(u32, be32_to_cpu(slb->persistent), SLB_MIN_SIZE);
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/* Load up the SLB entries from shadow SLB */
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for (i = 0; i < n; i++) {
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unsigned long rb = be64_to_cpu(slb->save_area[i].esid);
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unsigned long rs = be64_to_cpu(slb->save_area[i].vsid);
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rb = (rb & ~0xFFFul) | i;
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asm volatile("slbmte %0,%1" : : "r" (rs), "r" (rb));
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}
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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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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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if (cur_cpu_spec && cur_cpu_spec->flush_tlb) {
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cur_cpu_spec->flush_tlb(TLB_INVAL_SCOPE_GLOBAL);
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return 1;
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}
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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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{ 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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{ 0x00000080, 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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{ 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, },
|
|
{ 0x00000200, true,
|
|
MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT, /* SECONDARY ERAT */
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000100, true,
|
|
MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000080, true,
|
|
MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0, false, 0, 0, 0, 0 } };
|
|
|
|
static const struct mce_derror_table mce_p9_derror_table[] = {
|
|
{ 0x00008000, false,
|
|
MCE_ERROR_TYPE_UE, MCE_UE_ERROR_LOAD_STORE,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00004000, true,
|
|
MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00002000, true,
|
|
MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_LOAD_TIMEOUT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00001000, true,
|
|
MCE_ERROR_TYPE_LINK, MCE_LINK_ERROR_PAGE_TABLE_WALK_LOAD_STORE_TIMEOUT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000800, true,
|
|
MCE_ERROR_TYPE_ERAT, MCE_ERAT_ERROR_MULTIHIT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000400, true,
|
|
MCE_ERROR_TYPE_TLB, MCE_TLB_ERROR_MULTIHIT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000200, false,
|
|
MCE_ERROR_TYPE_USER, MCE_USER_ERROR_TLBIE,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000100, true,
|
|
MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_PARITY,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000080, true,
|
|
MCE_ERROR_TYPE_SLB, MCE_SLB_ERROR_MULTIHIT,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000040, true,
|
|
MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000020, false,
|
|
MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000010, false,
|
|
MCE_ERROR_TYPE_RA, MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0x00000008, false,
|
|
MCE_ERROR_TYPE_RA, MCE_RA_ERROR_LOAD_STORE_FOREIGN,
|
|
MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },
|
|
{ 0, false, 0, 0, 0, 0 } };
|
|
|
|
static int mce_find_instr_ea_and_pfn(struct pt_regs *regs, uint64_t *addr,
|
|
uint64_t *phys_addr)
|
|
{
|
|
/*
|
|
* Carefully look at the NIP to determine
|
|
* the instruction to analyse. Reading the NIP
|
|
* in real-mode is tricky and can lead to recursive
|
|
* faults
|
|
*/
|
|
int instr;
|
|
unsigned long pfn, instr_addr;
|
|
struct instruction_op op;
|
|
struct pt_regs tmp = *regs;
|
|
|
|
pfn = addr_to_pfn(regs, regs->nip);
|
|
if (pfn != ULONG_MAX) {
|
|
instr_addr = (pfn << PAGE_SHIFT) + (regs->nip & ~PAGE_MASK);
|
|
instr = *(unsigned int *)(instr_addr);
|
|
if (!analyse_instr(&op, &tmp, instr)) {
|
|
pfn = addr_to_pfn(regs, op.ea);
|
|
*addr = op.ea;
|
|
*phys_addr = (pfn << PAGE_SHIFT);
|
|
return 0;
|
|
}
|
|
/*
|
|
* analyse_instr() might fail if the instruction
|
|
* is not a load/store, although this is unexpected
|
|
* for load/store errors or if we got the NIP
|
|
* wrong
|
|
*/
|
|
}
|
|
*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);
|
|
handled = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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)
|
|
if (!mce_find_instr_ea_and_pfn(regs, addr,
|
|
phys_addr))
|
|
handled = 1;
|
|
}
|
|
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;
|
|
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)
|
|
{
|
|
return mce_handle_error(regs, mce_p9_derror_table, mce_p9_ierror_table);
|
|
}
|