Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RAS updates from Ingo Molnar:
 "The main changes in this cycle are:

   - RAS tracing/events infrastructure, by Gong Chen.

   - Various generalizations of the APEI code to make it available to
     non-x86 architectures, by Tomasz Nowicki"

* 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ras: Fix build warnings in <linux/aer.h>
  acpi, apei, ghes: Factor out ioremap virtual memory for IRQ and NMI context.
  acpi, apei, ghes: Make NMI error notification to be GHES architecture extension.
  apei, mce: Factor out APEI architecture specific MCE calls.
  RAS, extlog: Adjust init flow
  trace, eMCA: Add a knob to adjust where to save event log
  trace, RAS: Add eMCA trace event interface
  RAS, debugfs: Add debugfs interface for RAS subsystem
  CPER: Adjust code flow of some functions
  x86, MCE: Robustify mcheck_init_device
  trace, AER: Move trace into unified interface
  trace, RAS: Add basic RAS trace event
  x86, MCE: Kill CPU_POST_DEAD

4 files changed, 69 insertions, 5 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 86216a55eb59..6b71f0417293 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -131,6 +131,8 @@ config X86
         select GENERIC_CPU_AUTOPROBE
         select HAVE_ARCH_AUDITSYSCALL
         select ARCH_SUPPORTS_ATOMIC_RMW
+        select HAVE_ACPI_APEI if ACPI
+        select HAVE_ACPI_APEI_NMI if ACPI
 
 config INSTRUCTION_DECODER
         def_bool y
diff --git a/arch/x86/kernel/acpi/Makefile b/arch/x86/kernel/acpi/Makefile
index 163b22581472..3242e591fa82 100644
--- a/arch/x86/kernel/acpi/Makefile
+++ b/arch/x86/kernel/acpi/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_ACPI)              += boot.o
 obj-$(CONFIG_ACPI_SLEEP)        += sleep.o wakeup_$(BITS).o
+obj-$(CONFIG_ACPI_APEI)         += apei.o
 
 ifneq ($(CONFIG_ACPI_PROCESSOR),)
 obj-y                           += cstate.o
diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c
new file mode 100644
index 000000000000..c280df6b2aa2
--- /dev/null
+++ b/arch/x86/kernel/acpi/apei.c
@@ -0,0 +1,62 @@
+/*
+ * Arch-specific APEI-related functions.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <acpi/apei.h>
+
+#include <asm/mce.h>
+#include <asm/tlbflush.h>
+
+int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data)
+{
+#ifdef CONFIG_X86_MCE
+        int i;
+        struct acpi_hest_ia_corrected *cmc;
+        struct acpi_hest_ia_error_bank *mc_bank;
+
+        if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
+                return 0;
+
+        cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
+        if (!cmc->enabled)
+                return 0;
+
+        /*
+         * We expect HEST to provide a list of MC banks that report errors
+         * in firmware first mode. Otherwise, return non-zero value to
+         * indicate that we are done parsing HEST.
+         */
+        if (!(cmc->flags & ACPI_HEST_FIRMWARE_FIRST) ||
+            !cmc->num_hardware_banks)
+                return 1;
+
+        pr_info("HEST: Enabling Firmware First mode for corrected errors.\n");
+
+        mc_bank = (struct acpi_hest_ia_error_bank *)(cmc + 1);
+        for (i = 0; i < cmc->num_hardware_banks; i++, mc_bank++)
+                mce_disable_bank(mc_bank->bank_number);
+#endif
+        return 1;
+}
+
+void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
+{
+#ifdef CONFIG_X86_MCE
+        apei_mce_report_mem_error(sev, mem_err);
+#endif
+}
+
+void arch_apei_flush_tlb_one(unsigned long addr)
+{
+        __flush_tlb_one(addr);
+}
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 9a79c8dbd8e8..4fc57975acc1 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2385,6 +2385,10 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                         threshold_cpu_callback(action, cpu);
                 mce_device_remove(cpu);
                 mce_intel_hcpu_update(cpu);
+
+                /* intentionally ignoring frozen here */
+                if (!(action & CPU_TASKS_FROZEN))
+                        cmci_rediscover();
                 break;
         case CPU_DOWN_PREPARE:
                 smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
@@ -2396,11 +2400,6 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
         }
 
-        if (action == CPU_POST_DEAD) {
-                /* intentionally ignoring frozen here */
-                cmci_rediscover();
-        }
-
         return NOTIFY_OK;
 }