From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/arch/powerpc/kernel/mce.c | 234 +++++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 172 insertions(+), 62 deletions(-)
diff --git a/kernel/arch/powerpc/kernel/mce.c b/kernel/arch/powerpc/kernel/mce.c
index 93e0677..63702c0 100644
--- a/kernel/arch/powerpc/kernel/mce.c
+++ b/kernel/arch/powerpc/kernel/mce.c
@@ -1,19 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Machine check exception handling.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright 2013 IBM Corporation
* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
@@ -28,9 +15,12 @@
#include <linux/percpu.h>
#include <linux/export.h>
#include <linux/irq_work.h>
+#include <linux/extable.h>
+#include <linux/ftrace.h>
#include <asm/machdep.h>
#include <asm/mce.h>
+#include <asm/nmi.h>
static DEFINE_PER_CPU(int, mce_nest_count);
static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event);
@@ -46,7 +36,7 @@
static void machine_check_process_queued_event(struct irq_work *work);
static void machine_check_ue_irq_work(struct irq_work *work);
-void machine_check_ue_event(struct machine_check_event *evt);
+static void machine_check_ue_event(struct machine_check_event *evt);
static void machine_process_ue_event(struct work_struct *work);
static struct irq_work mce_event_process_work = {
@@ -58,6 +48,20 @@
};
DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
+
+static BLOCKING_NOTIFIER_HEAD(mce_notifier_list);
+
+int mce_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&mce_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(mce_register_notifier);
+
+int mce_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&mce_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(mce_unregister_notifier);
static void mce_set_error_info(struct machine_check_event *mce,
struct mce_error_info *mce_err)
@@ -116,6 +120,7 @@
mce->srr1 = regs->msr;
mce->gpr3 = regs->gpr[3];
mce->in_use = 1;
+ mce->cpu = get_paca()->paca_index;
/* Mark it recovered if we have handled it and MSR(RI=1). */
if (handled && (regs->msr & MSR_RI))
@@ -125,6 +130,8 @@
mce->initiator = mce_err->initiator;
mce->severity = mce_err->severity;
+ mce->sync_error = mce_err->sync_error;
+ mce->error_class = mce_err->error_class;
/*
* Populate the mce error_type and type-specific error_type.
@@ -158,6 +165,7 @@
if (phys_addr != ULONG_MAX) {
mce->u.ue_error.physical_address_provided = true;
mce->u.ue_error.physical_address = phys_addr;
+ mce->u.ue_error.ignore_event = mce_err->ignore_event;
machine_check_ue_event(mce);
}
}
@@ -221,7 +229,7 @@
/*
* Queue up the MCE event which then can be handled later.
*/
-void machine_check_ue_event(struct machine_check_event *evt)
+static void machine_check_ue_event(struct machine_check_event *evt)
{
int index;
@@ -259,6 +267,19 @@
/* Queue irq work to process this event later. */
irq_work_queue(&mce_event_process_work);
}
+
+void mce_common_process_ue(struct pt_regs *regs,
+ struct mce_error_info *mce_err)
+{
+ const struct exception_table_entry *entry;
+
+ entry = search_kernel_exception_table(regs->nip);
+ if (entry) {
+ mce_err->ignore_event = true;
+ regs->nip = extable_fixup(entry);
+ }
+}
+
/*
* process pending MCE event from the mce event queue. This function will be
* called during syscall exit.
@@ -271,12 +292,22 @@
while (__this_cpu_read(mce_ue_count) > 0) {
index = __this_cpu_read(mce_ue_count) - 1;
evt = this_cpu_ptr(&mce_ue_event_queue[index]);
+ blocking_notifier_call_chain(&mce_notifier_list, 0, evt);
#ifdef CONFIG_MEMORY_FAILURE
/*
* This should probably queued elsewhere, but
* oh! well
+ *
+ * Don't report this machine check because the caller has a
+ * asked us to ignore the event, it has a fixup handler which
+ * will do the appropriate error handling and reporting.
*/
if (evt->error_type == MCE_ERROR_TYPE_UE) {
+ if (evt->u.ue_error.ignore_event) {
+ __this_cpu_dec(mce_ue_count);
+ continue;
+ }
+
if (evt->u.ue_error.physical_address_provided) {
unsigned long pfn;
@@ -310,15 +341,25 @@
while (__this_cpu_read(mce_queue_count) > 0) {
index = __this_cpu_read(mce_queue_count) - 1;
evt = this_cpu_ptr(&mce_event_queue[index]);
- machine_check_print_event_info(evt, false);
+
+ if (evt->error_type == MCE_ERROR_TYPE_UE &&
+ evt->u.ue_error.ignore_event) {
+ __this_cpu_dec(mce_queue_count);
+ continue;
+ }
+ machine_check_print_event_info(evt, false, false);
__this_cpu_dec(mce_queue_count);
}
}
void machine_check_print_event_info(struct machine_check_event *evt,
- bool user_mode)
+ bool user_mode, bool in_guest)
{
- const char *level, *sevstr, *subtype;
+ const char *level, *sevstr, *subtype, *err_type, *initiator;
+ uint64_t ea = 0, pa = 0;
+ int n = 0;
+ char dar_str[50];
+ char pa_str[50];
static const char *mc_ue_types[] = {
"Indeterminate",
"Instruction fetch",
@@ -344,6 +385,7 @@
static const char *mc_user_types[] = {
"Indeterminate",
"tlbie(l) invalid",
+ "scv invalid",
};
static const char *mc_ra_types[] = {
"Indeterminate",
@@ -365,6 +407,13 @@
"Store (timeout)",
"Page table walk Load/Store (timeout)",
};
+ static const char *mc_error_class[] = {
+ "Unknown",
+ "Hardware error",
+ "Probable Hardware error (some chance of software cause)",
+ "Software error",
+ "Probable Software error (some chance of hardware cause)",
+ };
/* Print things out */
if (evt->version != MCE_V1) {
@@ -379,9 +428,9 @@
break;
case MCE_SEV_WARNING:
level = KERN_WARNING;
- sevstr = "";
+ sevstr = "Warning";
break;
- case MCE_SEV_ERROR_SYNC:
+ case MCE_SEV_SEVERE:
level = KERN_ERR;
sevstr = "Severe";
break;
@@ -392,99 +441,145 @@
break;
}
- printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
- evt->disposition == MCE_DISPOSITION_RECOVERED ?
- "Recovered" : "Not recovered");
-
- if (user_mode) {
- printk("%s NIP: [%016llx] PID: %d Comm: %s\n", level,
- evt->srr0, current->pid, current->comm);
- } else {
- printk("%s NIP [%016llx]: %pS\n", level, evt->srr0,
- (void *)evt->srr0);
+ switch(evt->initiator) {
+ case MCE_INITIATOR_CPU:
+ initiator = "CPU";
+ break;
+ case MCE_INITIATOR_PCI:
+ initiator = "PCI";
+ break;
+ case MCE_INITIATOR_ISA:
+ initiator = "ISA";
+ break;
+ case MCE_INITIATOR_MEMORY:
+ initiator = "Memory";
+ break;
+ case MCE_INITIATOR_POWERMGM:
+ initiator = "Power Management";
+ break;
+ case MCE_INITIATOR_UNKNOWN:
+ default:
+ initiator = "Unknown";
+ break;
}
- printk("%s Initiator: %s\n", level,
- evt->initiator == MCE_INITIATOR_CPU ? "CPU" : "Unknown");
switch (evt->error_type) {
case MCE_ERROR_TYPE_UE:
+ err_type = "UE";
subtype = evt->u.ue_error.ue_error_type <
ARRAY_SIZE(mc_ue_types) ?
mc_ue_types[evt->u.ue_error.ue_error_type]
: "Unknown";
- printk("%s Error type: UE [%s]\n", level, subtype);
if (evt->u.ue_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.ue_error.effective_address);
+ ea = evt->u.ue_error.effective_address;
if (evt->u.ue_error.physical_address_provided)
- printk("%s Physical address: %016llx\n",
- level, evt->u.ue_error.physical_address);
+ pa = evt->u.ue_error.physical_address;
break;
case MCE_ERROR_TYPE_SLB:
+ err_type = "SLB";
subtype = evt->u.slb_error.slb_error_type <
ARRAY_SIZE(mc_slb_types) ?
mc_slb_types[evt->u.slb_error.slb_error_type]
: "Unknown";
- printk("%s Error type: SLB [%s]\n", level, subtype);
if (evt->u.slb_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.slb_error.effective_address);
+ ea = evt->u.slb_error.effective_address;
break;
case MCE_ERROR_TYPE_ERAT:
+ err_type = "ERAT";
subtype = evt->u.erat_error.erat_error_type <
ARRAY_SIZE(mc_erat_types) ?
mc_erat_types[evt->u.erat_error.erat_error_type]
: "Unknown";
- printk("%s Error type: ERAT [%s]\n", level, subtype);
if (evt->u.erat_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.erat_error.effective_address);
+ ea = evt->u.erat_error.effective_address;
break;
case MCE_ERROR_TYPE_TLB:
+ err_type = "TLB";
subtype = evt->u.tlb_error.tlb_error_type <
ARRAY_SIZE(mc_tlb_types) ?
mc_tlb_types[evt->u.tlb_error.tlb_error_type]
: "Unknown";
- printk("%s Error type: TLB [%s]\n", level, subtype);
if (evt->u.tlb_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.tlb_error.effective_address);
+ ea = evt->u.tlb_error.effective_address;
break;
case MCE_ERROR_TYPE_USER:
+ err_type = "User";
subtype = evt->u.user_error.user_error_type <
ARRAY_SIZE(mc_user_types) ?
mc_user_types[evt->u.user_error.user_error_type]
: "Unknown";
- printk("%s Error type: User [%s]\n", level, subtype);
if (evt->u.user_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.user_error.effective_address);
+ ea = evt->u.user_error.effective_address;
break;
case MCE_ERROR_TYPE_RA:
+ err_type = "Real address";
subtype = evt->u.ra_error.ra_error_type <
ARRAY_SIZE(mc_ra_types) ?
mc_ra_types[evt->u.ra_error.ra_error_type]
: "Unknown";
- printk("%s Error type: Real address [%s]\n", level, subtype);
if (evt->u.ra_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.ra_error.effective_address);
+ ea = evt->u.ra_error.effective_address;
break;
case MCE_ERROR_TYPE_LINK:
+ err_type = "Link";
subtype = evt->u.link_error.link_error_type <
ARRAY_SIZE(mc_link_types) ?
mc_link_types[evt->u.link_error.link_error_type]
: "Unknown";
- printk("%s Error type: Link [%s]\n", level, subtype);
if (evt->u.link_error.effective_address_provided)
- printk("%s Effective address: %016llx\n",
- level, evt->u.link_error.effective_address);
+ ea = evt->u.link_error.effective_address;
+ break;
+ case MCE_ERROR_TYPE_DCACHE:
+ err_type = "D-Cache";
+ subtype = "Unknown";
+ break;
+ case MCE_ERROR_TYPE_ICACHE:
+ err_type = "I-Cache";
+ subtype = "Unknown";
break;
default:
case MCE_ERROR_TYPE_UNKNOWN:
- printk("%s Error type: Unknown\n", level);
+ err_type = "Unknown";
+ subtype = "";
break;
}
+
+ dar_str[0] = pa_str[0] = '\0';
+ if (ea && evt->srr0 != ea) {
+ /* Load/Store address */
+ n = sprintf(dar_str, "DAR: %016llx ", ea);
+ if (pa)
+ sprintf(dar_str + n, "paddr: %016llx ", pa);
+ } else if (pa) {
+ sprintf(pa_str, " paddr: %016llx", pa);
+ }
+
+ printk("%sMCE: CPU%d: machine check (%s) %s %s %s %s[%s]\n",
+ level, evt->cpu, sevstr, in_guest ? "Guest" : "Host",
+ err_type, subtype, dar_str,
+ evt->disposition == MCE_DISPOSITION_RECOVERED ?
+ "Recovered" : "Not recovered");
+
+ if (in_guest || user_mode) {
+ printk("%sMCE: CPU%d: PID: %d Comm: %s %sNIP: [%016llx]%s\n",
+ level, evt->cpu, current->pid, current->comm,
+ in_guest ? "Guest " : "", evt->srr0, pa_str);
+ } else {
+ printk("%sMCE: CPU%d: NIP: [%016llx] %pS%s\n",
+ level, evt->cpu, evt->srr0, (void *)evt->srr0, pa_str);
+ }
+
+ printk("%sMCE: CPU%d: Initiator %s\n", level, evt->cpu, initiator);
+
+ subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ?
+ mc_error_class[evt->error_class] : "Unknown";
+ printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype);
+
+#ifdef CONFIG_PPC_BOOK3S_64
+ /* Display faulty slb contents for SLB errors. */
+ if (evt->error_type == MCE_ERROR_TYPE_SLB)
+ slb_dump_contents(local_paca->mce_faulty_slbs);
+#endif
}
EXPORT_SYMBOL_GPL(machine_check_print_event_info);
@@ -493,14 +588,29 @@
*
* regs->nip and regs->msr contains srr0 and ssr1.
*/
-long machine_check_early(struct pt_regs *regs)
+long notrace machine_check_early(struct pt_regs *regs)
{
long handled = 0;
+ u8 ftrace_enabled = this_cpu_get_ftrace_enabled();
- __this_cpu_inc(irq_stat.mce_exceptions);
+ this_cpu_set_ftrace_enabled(0);
+ /* Do not use nmi_enter/exit for pseries hpte guest */
+ if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR))
+ nmi_enter();
- if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
- handled = cur_cpu_spec->machine_check_early(regs);
+ hv_nmi_check_nonrecoverable(regs);
+
+ /*
+ * See if platform is capable of handling machine check.
+ */
+ if (ppc_md.machine_check_early)
+ handled = ppc_md.machine_check_early(regs);
+
+ if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR))
+ nmi_exit();
+
+ this_cpu_set_ftrace_enabled(ftrace_enabled);
+
return handled;
}
@@ -616,7 +726,7 @@
{
int ret;
- __this_cpu_inc(irq_stat.hmi_exceptions);
+ local_paca->hmi_irqs++;
ret = hmi_handle_debugtrig(regs);
if (ret >= 0)
--
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