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authorIngo Molnar <mingo@kernel.org>2013-12-16 14:33:17 +0100
committerIngo Molnar <mingo@kernel.org>2013-12-16 14:33:17 +0100
commit014952270eb9770a41084e74c721e4c07f2306c5 (patch)
tree75460debf66bd187355599a73db0a2bffec5a2f8
parent319e2e3f63c348a9b66db4667efa73178e18b17d (diff)
parent42139eb356e3384759ca143ae04d82376346eb4c (diff)
Merge tag 'ras_for_3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/ras
Pull RAS updates from Borislav Petkov: * Add the functionality to override error reporting agents as some machines are sporting a new extended error logging capability which, if done properly in the BIOS, makes a corresponding EDAC module redundant, from Gong Chen. * PCIe AER tracepoint severity levels fix, from Rui Wang. * Error path correction for the mce device init, from Levente Kurusa. Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--Documentation/kernel-parameters.txt8
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c4
-rw-r--r--drivers/acpi/acpi_extlog.c18
-rw-r--r--drivers/edac/edac_stub.c19
-rw-r--r--drivers/edac/sb_edac.c6
-rw-r--r--include/linux/edac.h28
-rw-r--r--include/trace/events/ras.h10
7 files changed, 84 insertions, 9 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 50680a59a2ff..453092c822f1 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -881,6 +881,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
The xen output can only be used by Xen PV guests.
+ edac_report= [HW,EDAC] Control how to report EDAC event
+ Format: {"on" | "off" | "force"}
+ on: enable EDAC to report H/W event. May be overridden
+ by other higher priority error reporting module.
+ off: disable H/W event reporting through EDAC.
+ force: enforce the use of EDAC to report H/W event.
+ default: on.
+
ekgdboc= [X86,KGDB] Allow early kernel console debugging
ekgdboc=kbd
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index b3218cdee95f..a389c1d859ec 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2272,8 +2272,10 @@ static int mce_device_create(unsigned int cpu)
dev->release = &mce_device_release;
err = device_register(dev);
- if (err)
+ if (err) {
+ put_device(dev);
return err;
+ }
for (i = 0; mce_device_attrs[i]; i++) {
err = device_create_file(dev, mce_device_attrs[i]);
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index a6869e110ce5..5d33c5415405 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -12,6 +12,7 @@
#include <acpi/acpi_bus.h>
#include <linux/cper.h>
#include <linux/ratelimit.h>
+#include <linux/edac.h>
#include <asm/cpu.h>
#include <asm/mce.h>
@@ -43,6 +44,8 @@ struct extlog_l1_head {
u8 rev1[12];
};
+static int old_edac_report_status;
+
static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
/* L1 table related physical address */
@@ -150,7 +153,7 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
- return NOTIFY_DONE;
+ return NOTIFY_STOP;
}
static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
@@ -231,8 +234,12 @@ static int __init extlog_init(void)
u64 cap;
int rc;
- rc = -ENODEV;
+ if (get_edac_report_status() == EDAC_REPORTING_FORCE) {
+ pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
+ return -EPERM;
+ }
+ rc = -ENODEV;
rdmsrl(MSR_IA32_MCG_CAP, cap);
if (!(cap & MCG_ELOG_P))
return rc;
@@ -287,6 +294,12 @@ static int __init extlog_init(void)
if (elog_buf == NULL)
goto err_release_elog;
+ /*
+ * eMCA event report method has higher priority than EDAC method,
+ * unless EDAC event report method is mandatory.
+ */
+ old_edac_report_status = get_edac_report_status();
+ set_edac_report_status(EDAC_REPORTING_DISABLED);
mce_register_decode_chain(&extlog_mce_dec);
/* enable OS to be involved to take over management from BIOS */
((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
@@ -308,6 +321,7 @@ err:
static void __exit extlog_exit(void)
{
+ set_edac_report_status(old_edac_report_status);
mce_unregister_decode_chain(&extlog_mce_dec);
((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
if (extlog_l1_addr)
diff --git a/drivers/edac/edac_stub.c b/drivers/edac/edac_stub.c
index 351945fa2ecd..9d9e18aefaaa 100644
--- a/drivers/edac/edac_stub.c
+++ b/drivers/edac/edac_stub.c
@@ -29,6 +29,25 @@ EXPORT_SYMBOL_GPL(edac_err_assert);
static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
+int edac_report_status = EDAC_REPORTING_ENABLED;
+EXPORT_SYMBOL_GPL(edac_report_status);
+
+static int __init edac_report_setup(char *str)
+{
+ if (!str)
+ return -EINVAL;
+
+ if (!strncmp(str, "on", 2))
+ set_edac_report_status(EDAC_REPORTING_ENABLED);
+ else if (!strncmp(str, "off", 3))
+ set_edac_report_status(EDAC_REPORTING_DISABLED);
+ else if (!strncmp(str, "force", 5))
+ set_edac_report_status(EDAC_REPORTING_FORCE);
+
+ return 0;
+}
+__setup("edac_report=", edac_report_setup);
+
/*
* called to determine if there is an EDAC driver interested in
* knowing an event (such as NMI) occurred
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index d7f1b57bd3be..1229123ccb59 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -1829,6 +1829,9 @@ static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
struct mem_ctl_info *mci;
struct sbridge_pvt *pvt;
+ if (get_edac_report_status() == EDAC_REPORTING_DISABLED)
+ return NOTIFY_DONE;
+
mci = get_mci_for_node_id(mce->socketid);
if (!mci)
return NOTIFY_BAD;
@@ -2142,9 +2145,10 @@ static int __init sbridge_init(void)
opstate_init();
pci_rc = pci_register_driver(&sbridge_driver);
-
if (pci_rc >= 0) {
mce_register_decode_chain(&sbridge_mce_dec);
+ if (get_edac_report_status() == EDAC_REPORTING_DISABLED)
+ sbridge_printk(KERN_WARNING, "Loading driver, error reporting disabled.\n");
return 0;
}
diff --git a/include/linux/edac.h b/include/linux/edac.h
index dbdffe8d4469..8e6c20af11a2 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -35,6 +35,34 @@ extern void edac_atomic_assert_error(void);
extern struct bus_type *edac_get_sysfs_subsys(void);
extern void edac_put_sysfs_subsys(void);
+enum {
+ EDAC_REPORTING_ENABLED,
+ EDAC_REPORTING_DISABLED,
+ EDAC_REPORTING_FORCE
+};
+
+extern int edac_report_status;
+#ifdef CONFIG_EDAC
+static inline int get_edac_report_status(void)
+{
+ return edac_report_status;
+}
+
+static inline void set_edac_report_status(int new)
+{
+ edac_report_status = new;
+}
+#else
+static inline int get_edac_report_status(void)
+{
+ return EDAC_REPORTING_DISABLED;
+}
+
+static inline void set_edac_report_status(int new)
+{
+}
+#endif
+
static inline void opstate_init(void)
{
switch (edac_op_state) {
diff --git a/include/trace/events/ras.h b/include/trace/events/ras.h
index 88b878383797..1c875ad1ee5f 100644
--- a/include/trace/events/ras.h
+++ b/include/trace/events/ras.h
@@ -5,7 +5,7 @@
#define _TRACE_AER_H
#include <linux/tracepoint.h>
-#include <linux/edac.h>
+#include <linux/aer.h>
/*
@@ -63,10 +63,10 @@ TRACE_EVENT(aer_event,
TP_printk("%s PCIe Bus Error: severity=%s, %s\n",
__get_str(dev_name),
- __entry->severity == HW_EVENT_ERR_CORRECTED ? "Corrected" :
- __entry->severity == HW_EVENT_ERR_FATAL ?
- "Fatal" : "Uncorrected",
- __entry->severity == HW_EVENT_ERR_CORRECTED ?
+ __entry->severity == AER_CORRECTABLE ? "Corrected" :
+ __entry->severity == AER_FATAL ?
+ "Fatal" : "Uncorrected, non-fatal",
+ __entry->severity == AER_CORRECTABLE ?
__print_flags(__entry->status, "|", aer_correctable_errors) :
__print_flags(__entry->status, "|", aer_uncorrectable_errors))
);

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