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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-13 13:33:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-13 13:33:20 -0700
commit07f2d8c63fa439613405760841e41fce3041023f (patch)
treed5ef4a4f4d00b6a04ff2a59e66a6c7238008dff5 /arch
parentee799f41eb2bc0484711b0fc942fddf54248289f (diff)
parentcee8f5a6c8c917613dd021552909d071b1dab592 (diff)
downloadkernel-07f2d8c63fa439613405760841e41fce3041023f.tar.gz
Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 RAS changes from Ingo Molnar: "The main changes in this cycle were: - Simplify the CMCI storm logic on Intel CPUs after yet another report about a race in the code (Borislav Petkov) - Enable the MCE threshold irq on AMD CPUs by default (Aravind Gopalakrishnan) - Add AMD-specific MCE-severity grading function. Further error recovery actions will be based on its output (Aravind Gopalakrishnan) - Documentation updates (Borislav Petkov) - ... assorted fixes and cleanups" * 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mce/severity: Fix warning about indented braces x86/mce: Define mce_severity function pointer x86/mce: Add an AMD severities-grading function x86/mce: Reindent __mcheck_cpu_apply_quirks() properly x86/mce: Use safe MSR accesses for AMD quirk x86/MCE/AMD: Enable thresholding interrupts by default if supported x86/MCE: Make mce_panic() fatal machine check msg in the same pattern x86/MCE/intel: Cleanup CMCI storm logic Documentation/acpi/einj: Correct and streamline text x86/MCE/AMD: Drop bogus const modifier from AMD's bank4_names()
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/mce.h16
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-internal.h11
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce-severity.c66
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c154
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce_amd.c11
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce_intel.c63
6 files changed, 214 insertions, 107 deletions
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 9b3de99dc004..1f5a86d518db 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -116,6 +116,12 @@ struct mca_config {
u32 rip_msr;
};
+struct mce_vendor_flags {
+ __u64 overflow_recov : 1, /* cpuid_ebx(80000007) */
+ __reserved_0 : 63;
+};
+extern struct mce_vendor_flags mce_flags;
+
extern struct mca_config mca_cfg;
extern void mce_register_decode_chain(struct notifier_block *nb);
extern void mce_unregister_decode_chain(struct notifier_block *nb);
@@ -128,9 +134,11 @@ extern int mce_p5_enabled;
#ifdef CONFIG_X86_MCE
int mcheck_init(void);
void mcheck_cpu_init(struct cpuinfo_x86 *c);
+void mcheck_vendor_init_severity(void);
#else
static inline int mcheck_init(void) { return 0; }
static inline void mcheck_cpu_init(struct cpuinfo_x86 *c) {}
+static inline void mcheck_vendor_init_severity(void) {}
#endif
#ifdef CONFIG_X86_ANCIENT_MCE
@@ -183,11 +191,11 @@ typedef DECLARE_BITMAP(mce_banks_t, MAX_NR_BANKS);
DECLARE_PER_CPU(mce_banks_t, mce_poll_banks);
enum mcp_flags {
- MCP_TIMESTAMP = (1 << 0), /* log time stamp */
- MCP_UC = (1 << 1), /* log uncorrected errors */
- MCP_DONTLOG = (1 << 2), /* only clear, don't log */
+ MCP_TIMESTAMP = BIT(0), /* log time stamp */
+ MCP_UC = BIT(1), /* log uncorrected errors */
+ MCP_DONTLOG = BIT(2), /* only clear, don't log */
};
-void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
+bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
int mce_notify_irq(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
index 10b46906767f..fe32074b865b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
+++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
@@ -14,6 +14,7 @@ enum severity_level {
};
#define ATTR_LEN 16
+#define INITIAL_CHECK_INTERVAL 5 * 60 /* 5 minutes */
/* One object for each MCE bank, shared by all CPUs */
struct mce_bank {
@@ -23,20 +24,20 @@ struct mce_bank {
char attrname[ATTR_LEN]; /* attribute name */
};
-int mce_severity(struct mce *a, int tolerant, char **msg, bool is_excp);
+extern int (*mce_severity)(struct mce *a, int tolerant, char **msg, bool is_excp);
struct dentry *mce_get_debugfs_dir(void);
extern struct mce_bank *mce_banks;
extern mce_banks_t mce_banks_ce_disabled;
#ifdef CONFIG_X86_MCE_INTEL
-unsigned long mce_intel_adjust_timer(unsigned long interval);
-void mce_intel_cmci_poll(void);
+unsigned long cmci_intel_adjust_timer(unsigned long interval);
+bool mce_intel_cmci_poll(void);
void mce_intel_hcpu_update(unsigned long cpu);
void cmci_disable_bank(int bank);
#else
-# define mce_intel_adjust_timer mce_adjust_timer_default
-static inline void mce_intel_cmci_poll(void) { }
+# define cmci_intel_adjust_timer mce_adjust_timer_default
+static inline bool mce_intel_cmci_poll(void) { return false; }
static inline void mce_intel_hcpu_update(unsigned long cpu) { }
static inline void cmci_disable_bank(int bank) { }
#endif
diff --git a/arch/x86/kernel/cpu/mcheck/mce-severity.c b/arch/x86/kernel/cpu/mcheck/mce-severity.c
index 8bb433043a7f..9c682c222071 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-severity.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-severity.c
@@ -186,7 +186,61 @@ static int error_context(struct mce *m)
return ((m->cs & 3) == 3) ? IN_USER : IN_KERNEL;
}
-int mce_severity(struct mce *m, int tolerant, char **msg, bool is_excp)
+/*
+ * See AMD Error Scope Hierarchy table in a newer BKDG. For example
+ * 49125_15h_Models_30h-3Fh_BKDG.pdf, section "RAS Features"
+ */
+static int mce_severity_amd(struct mce *m, int tolerant, char **msg, bool is_excp)
+{
+ enum context ctx = error_context(m);
+
+ /* Processor Context Corrupt, no need to fumble too much, die! */
+ if (m->status & MCI_STATUS_PCC)
+ return MCE_PANIC_SEVERITY;
+
+ if (m->status & MCI_STATUS_UC) {
+
+ /*
+ * On older systems where overflow_recov flag is not present, we
+ * should simply panic if an error overflow occurs. If
+ * overflow_recov flag is present and set, then software can try
+ * to at least kill process to prolong system operation.
+ */
+ if (mce_flags.overflow_recov) {
+ /* software can try to contain */
+ if (!(m->mcgstatus & MCG_STATUS_RIPV) && (ctx == IN_KERNEL))
+ return MCE_PANIC_SEVERITY;
+
+ /* kill current process */
+ return MCE_AR_SEVERITY;
+ } else {
+ /* at least one error was not logged */
+ if (m->status & MCI_STATUS_OVER)
+ return MCE_PANIC_SEVERITY;
+ }
+
+ /*
+ * For any other case, return MCE_UC_SEVERITY so that we log the
+ * error and exit #MC handler.
+ */
+ return MCE_UC_SEVERITY;
+ }
+
+ /*
+ * deferred error: poll handler catches these and adds to mce_ring so
+ * memory-failure can take recovery actions.
+ */
+ if (m->status & MCI_STATUS_DEFERRED)
+ return MCE_DEFERRED_SEVERITY;
+
+ /*
+ * corrected error: poll handler catches these and passes responsibility
+ * of decoding the error to EDAC
+ */
+ return MCE_KEEP_SEVERITY;
+}
+
+static int mce_severity_intel(struct mce *m, int tolerant, char **msg, bool is_excp)
{
enum exception excp = (is_excp ? EXCP_CONTEXT : NO_EXCP);
enum context ctx = error_context(m);
@@ -216,6 +270,16 @@ int mce_severity(struct mce *m, int tolerant, char **msg, bool is_excp)
}
}
+/* Default to mce_severity_intel */
+int (*mce_severity)(struct mce *m, int tolerant, char **msg, bool is_excp) =
+ mce_severity_intel;
+
+void __init mcheck_vendor_init_severity(void)
+{
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ mce_severity = mce_severity_amd;
+}
+
#ifdef CONFIG_DEBUG_FS
static void *s_start(struct seq_file *f, loff_t *pos)
{
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 3c036cb4a370..e535533d5ab8 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -60,11 +60,12 @@ static DEFINE_MUTEX(mce_chrdev_read_mutex);
#define CREATE_TRACE_POINTS
#include <trace/events/mce.h>
-#define SPINUNIT 100 /* 100ns */
+#define SPINUNIT 100 /* 100ns */
DEFINE_PER_CPU(unsigned, mce_exception_count);
struct mce_bank *mce_banks __read_mostly;
+struct mce_vendor_flags mce_flags __read_mostly;
struct mca_config mca_cfg __read_mostly = {
.bootlog = -1,
@@ -89,9 +90,6 @@ static DECLARE_WAIT_QUEUE_HEAD(mce_chrdev_wait);
static DEFINE_PER_CPU(struct mce, mces_seen);
static int cpu_missing;
-/* CMCI storm detection filter */
-static DEFINE_PER_CPU(unsigned long, mce_polled_error);
-
/*
* MCA banks polled by the period polling timer for corrected events.
* With Intel CMCI, this only has MCA banks which do not support CMCI (if any).
@@ -622,8 +620,9 @@ DEFINE_PER_CPU(unsigned, mce_poll_count);
* is already totally * confused. In this case it's likely it will
* not fully execute the machine check handler either.
*/
-void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
+bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
{
+ bool error_logged = false;
struct mce m;
int severity;
int i;
@@ -646,7 +645,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
if (!(m.status & MCI_STATUS_VAL))
continue;
- this_cpu_write(mce_polled_error, 1);
+
/*
* Uncorrected or signalled events are handled by the exception
* handler when it is enabled, so don't process those here.
@@ -679,8 +678,10 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
* Don't get the IP here because it's unlikely to
* have anything to do with the actual error location.
*/
- if (!(flags & MCP_DONTLOG) && !mca_cfg.dont_log_ce)
+ if (!(flags & MCP_DONTLOG) && !mca_cfg.dont_log_ce) {
+ error_logged = true;
mce_log(&m);
+ }
/*
* Clear state for this bank.
@@ -694,6 +695,8 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
*/
sync_core();
+
+ return error_logged;
}
EXPORT_SYMBOL_GPL(machine_check_poll);
@@ -813,7 +816,7 @@ static void mce_reign(void)
* other CPUs.
*/
if (m && global_worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3)
- mce_panic("Fatal Machine check", m, msg);
+ mce_panic("Fatal machine check", m, msg);
/*
* For UC somewhere we let the CPU who detects it handle it.
@@ -826,7 +829,7 @@ static void mce_reign(void)
* source or one CPU is hung. Panic.
*/
if (global_worst <= MCE_KEEP_SEVERITY && mca_cfg.tolerant < 3)
- mce_panic("Machine check from unknown source", NULL, NULL);
+ mce_panic("Fatal machine check from unknown source", NULL, NULL);
/*
* Now clear all the mces_seen so that they don't reappear on
@@ -1258,7 +1261,7 @@ void mce_log_therm_throt_event(__u64 status)
* poller finds an MCE, poll 2x faster. When the poller finds no more
* errors, poll 2x slower (up to check_interval seconds).
*/
-static unsigned long check_interval = 5 * 60; /* 5 minutes */
+static unsigned long check_interval = INITIAL_CHECK_INTERVAL;
static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
static DEFINE_PER_CPU(struct timer_list, mce_timer);
@@ -1268,49 +1271,57 @@ static unsigned long mce_adjust_timer_default(unsigned long interval)
return interval;
}
-static unsigned long (*mce_adjust_timer)(unsigned long interval) =
- mce_adjust_timer_default;
+static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default;
-static int cmc_error_seen(void)
+static void __restart_timer(struct timer_list *t, unsigned long interval)
{
- unsigned long *v = this_cpu_ptr(&mce_polled_error);
+ unsigned long when = jiffies + interval;
+ unsigned long flags;
+
+ local_irq_save(flags);
- return test_and_clear_bit(0, v);
+ if (timer_pending(t)) {
+ if (time_before(when, t->expires))
+ mod_timer_pinned(t, when);
+ } else {
+ t->expires = round_jiffies(when);
+ add_timer_on(t, smp_processor_id());
+ }
+
+ local_irq_restore(flags);
}
static void mce_timer_fn(unsigned long data)
{
struct timer_list *t = this_cpu_ptr(&mce_timer);
+ int cpu = smp_processor_id();
unsigned long iv;
- int notify;
- WARN_ON(smp_processor_id() != data);
+ WARN_ON(cpu != data);
+
+ iv = __this_cpu_read(mce_next_interval);
if (mce_available(this_cpu_ptr(&cpu_info))) {
- machine_check_poll(MCP_TIMESTAMP,
- this_cpu_ptr(&mce_poll_banks));
- mce_intel_cmci_poll();
+ machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_poll_banks));
+
+ if (mce_intel_cmci_poll()) {
+ iv = mce_adjust_timer(iv);
+ goto done;
+ }
}
/*
- * Alert userspace if needed. If we logged an MCE, reduce the
- * polling interval, otherwise increase the polling interval.
+ * Alert userspace if needed. If we logged an MCE, reduce the polling
+ * interval, otherwise increase the polling interval.
*/
- iv = __this_cpu_read(mce_next_interval);
- notify = mce_notify_irq();
- notify |= cmc_error_seen();
- if (notify) {
+ if (mce_notify_irq())
iv = max(iv / 2, (unsigned long) HZ/100);
- } else {
+ else
iv = min(iv * 2, round_jiffies_relative(check_interval * HZ));
- iv = mce_adjust_timer(iv);
- }
+
+done:
__this_cpu_write(mce_next_interval, iv);
- /* Might have become 0 after CMCI storm subsided */
- if (iv) {
- t->expires = jiffies + iv;
- add_timer_on(t, smp_processor_id());
- }
+ __restart_timer(t, iv);
}
/*
@@ -1319,16 +1330,10 @@ static void mce_timer_fn(unsigned long data)
void mce_timer_kick(unsigned long interval)
{
struct timer_list *t = this_cpu_ptr(&mce_timer);
- unsigned long when = jiffies + interval;
unsigned long iv = __this_cpu_read(mce_next_interval);
- if (timer_pending(t)) {
- if (time_before(when, t->expires))
- mod_timer_pinned(t, when);
- } else {
- t->expires = round_jiffies(when);
- add_timer_on(t, smp_processor_id());
- }
+ __restart_timer(t, interval);
+
if (interval < iv)
__this_cpu_write(mce_next_interval, interval);
}
@@ -1525,45 +1530,46 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
* Various K7s with broken bank 0 around. Always disable
* by default.
*/
- if (c->x86 == 6 && cfg->banks > 0)
+ if (c->x86 == 6 && cfg->banks > 0)
mce_banks[0].ctl = 0;
- /*
- * Turn off MC4_MISC thresholding banks on those models since
- * they're not supported there.
- */
- if (c->x86 == 0x15 &&
- (c->x86_model >= 0x10 && c->x86_model <= 0x1f)) {
- int i;
- u64 val, hwcr;
- bool need_toggle;
- u32 msrs[] = {
+ /*
+ * overflow_recov is supported for F15h Models 00h-0fh
+ * even though we don't have a CPUID bit for it.
+ */
+ if (c->x86 == 0x15 && c->x86_model <= 0xf)
+ mce_flags.overflow_recov = 1;
+
+ /*
+ * Turn off MC4_MISC thresholding banks on those models since
+ * they're not supported there.
+ */
+ if (c->x86 == 0x15 &&
+ (c->x86_model >= 0x10 && c->x86_model <= 0x1f)) {
+ int i;
+ u64 hwcr;
+ bool need_toggle;
+ u32 msrs[] = {
0x00000413, /* MC4_MISC0 */
0xc0000408, /* MC4_MISC1 */
- };
+ };
- rdmsrl(MSR_K7_HWCR, hwcr);
+ rdmsrl(MSR_K7_HWCR, hwcr);
- /* McStatusWrEn has to be set */
- need_toggle = !(hwcr & BIT(18));
+ /* McStatusWrEn has to be set */
+ need_toggle = !(hwcr & BIT(18));
- if (need_toggle)
- wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
+ if (need_toggle)
+ wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
- for (i = 0; i < ARRAY_SIZE(msrs); i++) {
- rdmsrl(msrs[i], val);
+ /* Clear CntP bit safely */
+ for (i = 0; i < ARRAY_SIZE(msrs); i++)
+ msr_clear_bit(msrs[i], 62);
- /* CntP bit set? */
- if (val & BIT_64(62)) {
- val &= ~BIT_64(62);
- wrmsrl(msrs[i], val);
- }
- }
-
- /* restore old settings */
- if (need_toggle)
- wrmsrl(MSR_K7_HWCR, hwcr);
- }
+ /* restore old settings */
+ if (need_toggle)
+ wrmsrl(MSR_K7_HWCR, hwcr);
+ }
}
if (c->x86_vendor == X86_VENDOR_INTEL) {
@@ -1629,10 +1635,11 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
switch (c->x86_vendor) {
case X86_VENDOR_INTEL:
mce_intel_feature_init(c);
- mce_adjust_timer = mce_intel_adjust_timer;
+ mce_adjust_timer = cmci_intel_adjust_timer;
break;
case X86_VENDOR_AMD:
mce_amd_feature_init(c);
+ mce_flags.overflow_recov = cpuid_ebx(0x80000007) & 0x1;
break;
default:
break;
@@ -2017,6 +2024,7 @@ __setup("mce", mcheck_enable);
int __init mcheck_init(void)
{
mcheck_intel_therm_init();
+ mcheck_vendor_init_severity();
return 0;
}
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index f1c3769bbd64..55ad9b37cae8 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -79,7 +79,7 @@ static inline bool is_shared_bank(int bank)
return (bank == 4);
}
-static const char * const bank4_names(struct threshold_block *b)
+static const char *bank4_names(const struct threshold_block *b)
{
switch (b->address) {
/* MSR4_MISC0 */
@@ -250,6 +250,7 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
if (!b.interrupt_capable)
goto init;
+ b.interrupt_enable = 1;
new = (high & MASK_LVTOFF_HI) >> 20;
offset = setup_APIC_mce(offset, new);
@@ -322,6 +323,8 @@ static void amd_threshold_interrupt(void)
log:
mce_setup(&m);
rdmsrl(MSR_IA32_MCx_STATUS(bank), m.status);
+ if (!(m.status & MCI_STATUS_VAL))
+ return;
m.misc = ((u64)high << 32) | low;
m.bank = bank;
mce_log(&m);
@@ -497,10 +500,12 @@ static int allocate_threshold_blocks(unsigned int cpu, unsigned int bank,
b->interrupt_capable = lvt_interrupt_supported(bank, high);
b->threshold_limit = THRESHOLD_MAX;
- if (b->interrupt_capable)
+ if (b->interrupt_capable) {
threshold_ktype.default_attrs[2] = &interrupt_enable.attr;
- else
+ b->interrupt_enable = 1;
+ } else {
threshold_ktype.default_attrs[2] = NULL;
+ }
INIT_LIST_HEAD(&b->miscj);
diff --git a/arch/x86/kernel/cpu/mcheck/mce_intel.c b/arch/x86/kernel/cpu/mcheck/mce_intel.c
index b3c97bafc123..b4a41cf030ed 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
@@ -39,6 +39,15 @@
static DEFINE_PER_CPU(mce_banks_t, mce_banks_owned);
/*
+ * CMCI storm detection backoff counter
+ *
+ * During storm, we reset this counter to INITIAL_CHECK_INTERVAL in case we've
+ * encountered an error. If not, we decrement it by one. We signal the end of
+ * the CMCI storm when it reaches 0.
+ */
+static DEFINE_PER_CPU(int, cmci_backoff_cnt);
+
+/*
* cmci_discover_lock protects against parallel discovery attempts
* which could race against each other.
*/
@@ -46,7 +55,7 @@ static DEFINE_RAW_SPINLOCK(cmci_discover_lock);
#define CMCI_THRESHOLD 1
#define CMCI_POLL_INTERVAL (30 * HZ)
-#define CMCI_STORM_INTERVAL (1 * HZ)
+#define CMCI_STORM_INTERVAL (HZ)
#define CMCI_STORM_THRESHOLD 15
static DEFINE_PER_CPU(unsigned long, cmci_time_stamp);
@@ -82,11 +91,21 @@ static int cmci_supported(int *banks)
return !!(cap & MCG_CMCI_P);
}
-void mce_intel_cmci_poll(void)
+bool mce_intel_cmci_poll(void)
{
if (__this_cpu_read(cmci_storm_state) == CMCI_STORM_NONE)
- return;
- machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_banks_owned));
+ return false;
+
+ /*
+ * Reset the counter if we've logged an error in the last poll
+ * during the storm.
+ */
+ if (machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_banks_owned)))
+ this_cpu_write(cmci_backoff_cnt, INITIAL_CHECK_INTERVAL);
+ else
+ this_cpu_dec(cmci_backoff_cnt);
+
+ return true;
}
void mce_intel_hcpu_update(unsigned long cpu)
@@ -97,31 +116,32 @@ void mce_intel_hcpu_update(unsigned long cpu)
per_cpu(cmci_storm_state, cpu) = CMCI_STORM_NONE;
}
-unsigned long mce_intel_adjust_timer(unsigned long interval)
+unsigned long cmci_intel_adjust_timer(unsigned long interval)
{
- int r;
-
- if (interval < CMCI_POLL_INTERVAL)
- return interval;
+ if ((this_cpu_read(cmci_backoff_cnt) > 0) &&
+ (__this_cpu_read(cmci_storm_state) == CMCI_STORM_ACTIVE)) {
+ mce_notify_irq();
+ return CMCI_STORM_INTERVAL;
+ }
switch (__this_cpu_read(cmci_storm_state)) {
case CMCI_STORM_ACTIVE:
+
/*
* We switch back to interrupt mode once the poll timer has
- * silenced itself. That means no events recorded and the
- * timer interval is back to our poll interval.
+ * silenced itself. That means no events recorded and the timer
+ * interval is back to our poll interval.
*/
__this_cpu_write(cmci_storm_state, CMCI_STORM_SUBSIDED);
- r = atomic_sub_return(1, &cmci_storm_on_cpus);
- if (r == 0)
+ if (!atomic_sub_return(1, &cmci_storm_on_cpus))
pr_notice("CMCI storm subsided: switching to interrupt mode\n");
+
/* FALLTHROUGH */
case CMCI_STORM_SUBSIDED:
/*
- * We wait for all cpus to go back to SUBSIDED
- * state. When that happens we switch back to
- * interrupt mode.
+ * We wait for all CPUs to go back to SUBSIDED state. When that
+ * happens we switch back to interrupt mode.
*/
if (!atomic_read(&cmci_storm_on_cpus)) {
__this_cpu_write(cmci_storm_state, CMCI_STORM_NONE);
@@ -130,10 +150,8 @@ unsigned long mce_intel_adjust_timer(unsigned long interval)
}
return CMCI_POLL_INTERVAL;
default:
- /*
- * We have shiny weather. Let the poll do whatever it
- * thinks.
- */
+
+ /* We have shiny weather. Let the poll do whatever it thinks. */
return interval;
}
}
@@ -178,7 +196,8 @@ static bool cmci_storm_detect(void)
cmci_storm_disable_banks();
__this_cpu_write(cmci_storm_state, CMCI_STORM_ACTIVE);
r = atomic_add_return(1, &cmci_storm_on_cpus);
- mce_timer_kick(CMCI_POLL_INTERVAL);
+ mce_timer_kick(CMCI_STORM_INTERVAL);
+ this_cpu_write(cmci_backoff_cnt, INITIAL_CHECK_INTERVAL);
if (r == 1)
pr_notice("CMCI storm detected: switching to poll mode\n");
@@ -195,6 +214,7 @@ static void intel_threshold_interrupt(void)
{
if (cmci_storm_detect())
return;
+
machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_banks_owned));
mce_notify_irq();
}
@@ -286,6 +306,7 @@ void cmci_recheck(void)
if (!mce_available(raw_cpu_ptr(&cpu_info)) || !cmci_supported(&banks))
return;
+
local_irq_save(flags);
machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_banks_owned));
local_irq_restore(flags);