[PATCH v2 2/2] thermal: Move therm_throt there from x86/mce

Borislav Petkov
2021-01-26T06:14:22Z

From: Borislav Petkov <bp@suse.de>

This functionality has nothing to do with MCE, move it to the thermal
framework and untangle it from MCE.

Have thermal_set_handler() check the build-time assigned default handler
stub was the one used before therm_throt assigns a new one.

Requested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/Kconfig | 4 ---
arch/x86/include/asm/irq.h | 4 +++
arch/x86/include/asm/mce.h | 16 ----------
arch/x86/include/asm/thermal.h | 21 ++++++++++++++
arch/x86/kernel/cpu/intel.c | 3 ++
arch/x86/kernel/cpu/mce/Makefile | 2 --
arch/x86/kernel/cpu/mce/intel.c | 1 -
arch/x86/kernel/irq.c | 29 +++++++++++++++++++
drivers/thermal/intel/Kconfig | 4 +++
drivers/thermal/intel/Makefile | 1 +
.../thermal/intel}/therm_throt.c | 25 ++--------------
drivers/thermal/intel/x86_pkg_temp_thermal.c | 3 +-
12 files changed, 67 insertions(+), 46 deletions(-)
create mode 100644 arch/x86/include/asm/thermal.h
rename {arch/x86/kernel/cpu/mce => drivers/thermal/intel}/therm_throt.c (97%)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 21f851179ff0..9989db3a9bf5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1158,10 +1158,6 @@ config X86_MCE_INJECT
If you don't know what a machine check is and you don't do kernel
QA it is safe to say n.

-config X86_THERMAL_VECTOR
- def_bool y
- depends on X86_MCE_INTEL
-
source "arch/x86/events/Kconfig"

config X86_LEGACY_VM86
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 528c8a71fe7f..ad65fe7dceb1 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -53,4 +53,8 @@ void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
#endif

+#ifdef CONFIG_X86_THERMAL_VECTOR
+void thermal_set_handler(void (*handler)(void));
+#endif
+
#endif /* _ASM_X86_IRQ_H */
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index def9aa5e1fa4..ddfb3cad8dff 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -288,22 +288,6 @@ extern void (*mce_threshold_vector)(void);
/* Deferred error interrupt handler */
extern void (*deferred_error_int_vector)(void);

-/*
- * Thermal handler
- */
-
-void intel_init_thermal(struct cpuinfo_x86 *c);
-
-/* Interrupt Handler for core thermal thresholds */
-extern int (*platform_thermal_notify)(__u64 msr_val);
-
-/* Interrupt Handler for package thermal thresholds */
-extern int (*platform_thermal_package_notify)(__u64 msr_val);
-
-/* Callback support of rate control, return true, if
- * callback has rate control */
-extern bool (*platform_thermal_package_rate_control)(void);
-
/*
* Used by APEI to report memory error via /dev/mcelog
*/
diff --git a/arch/x86/include/asm/thermal.h b/arch/x86/include/asm/thermal.h
new file mode 100644
index 000000000000..58b0e0a4af6e
--- /dev/null
+++ b/arch/x86/include/asm/thermal.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_THERMAL_H
+#define _ASM_X86_THERMAL_H
+
+/* Interrupt Handler for package thermal thresholds */
+extern int (*platform_thermal_package_notify)(__u64 msr_val);
+
+/* Interrupt Handler for core thermal thresholds */
+extern int (*platform_thermal_notify)(__u64 msr_val);
+
+/* Callback support of rate control, return true, if
+ * callback has rate control */
+extern bool (*platform_thermal_package_rate_control)(void);
+
+#ifdef CONFIG_X86_THERMAL_VECTOR
+void intel_init_thermal(struct cpuinfo_x86 *c);
+#else
+static inline void intel_init_thermal(struct cpuinfo_x86 *c) { }
+#endif
+
+#endif /* _ASM_X86_THERMAL_H */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 59a1e3ce3f14..71221af87cb1 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -24,6 +24,7 @@
#include <asm/traps.h>
#include <asm/resctrl.h>
#include <asm/numa.h>
+#include <asm/thermal.h>

#ifdef CONFIG_X86_64
#include <linux/topology.h>
@@ -719,6 +720,8 @@ static void init_intel(struct cpuinfo_x86 *c)
tsx_disable();

split_lock_init();
+
+ intel_init_thermal(c);
}

#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/cpu/mce/Makefile b/arch/x86/kernel/cpu/mce/Makefile
index 9f020c994154..015856abdbb1 100644
--- a/arch/x86/kernel/cpu/mce/Makefile
+++ b/arch/x86/kernel/cpu/mce/Makefile
@@ -9,8 +9,6 @@ obj-$(CONFIG_X86_MCE_THRESHOLD) += threshold.o
mce-inject-y := inject.o
obj-$(CONFIG_X86_MCE_INJECT) += mce-inject.o

-obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o
-
obj-$(CONFIG_ACPI_APEI) += apei.o

obj-$(CONFIG_X86_MCELOG_LEGACY) += dev-mcelog.o
diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
index c2476fe0682e..e309476743b7 100644
--- a/arch/x86/kernel/cpu/mce/intel.c
+++ b/arch/x86/kernel/cpu/mce/intel.c
@@ -531,7 +531,6 @@ static void intel_imc_init(struct cpuinfo_x86 *c)

void mce_intel_feature_init(struct cpuinfo_x86 *c)
{
- intel_init_thermal(c);
intel_init_cmci();
intel_init_lmce();
intel_ppin_init(c);
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index c5dd50369e2f..523fa5266d3e 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -374,3 +374,32 @@ void fixup_irqs(void)
}
}
#endif
+
+#ifdef CONFIG_X86_THERMAL_VECTOR
+static void unexpected_thermal_interrupt(void)
+{
+ pr_err("CPU%d: Unexpected LVT thermal interrupt!\n",
+ smp_processor_id());
+}
+
+static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
+
+void thermal_set_handler(void (*handler)(void))
+{
+ if (handler) {
+ WARN_ON(smp_thermal_vector != unexpected_thermal_interrupt);
+ smp_thermal_vector = handler;
+ } else {
+ smp_thermal_vector = unexpected_thermal_interrupt;
+ }
+}
+
+DEFINE_IDTENTRY_SYSVEC(sysvec_thermal)
+{
+ trace_thermal_apic_entry(THERMAL_APIC_VECTOR);
+ inc_irq_stat(irq_thermal_count);
+ smp_thermal_vector();
+ trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
+ ack_APIC_irq();
+}
+#endif
diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig
index 8025b21f43fa..ce4f59213c7a 100644
--- a/drivers/thermal/intel/Kconfig
+++ b/drivers/thermal/intel/Kconfig
@@ -8,6 +8,10 @@ config INTEL_POWERCLAMP
enforce idle time which results in more package C-state residency. The
user interface is exposed via generic thermal framework.

+config X86_THERMAL_VECTOR
+ def_bool y
+ depends on X86 && CPU_SUP_INTEL && X86_LOCAL_APIC
+
config X86_PKG_TEMP_THERMAL
tristate "X86 package temperature thermal driver"
depends on X86_THERMAL_VECTOR
diff --git a/drivers/thermal/intel/Makefile b/drivers/thermal/intel/Makefile
index 0d9736ced5d4..ff2ad30ef397 100644
--- a/drivers/thermal/intel/Makefile
+++ b/drivers/thermal/intel/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_INTEL_QUARK_DTS_THERMAL) += intel_quark_dts_thermal.o
obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/
obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o
obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o
+obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o
diff --git a/arch/x86/kernel/cpu/mce/therm_throt.c b/drivers/thermal/intel/therm_throt.c
similarity index 97%
rename from arch/x86/kernel/cpu/mce/therm_throt.c
rename to drivers/thermal/intel/therm_throt.c
index 5b1aa0f30655..4f12fcd0e40a 100644
--- a/arch/x86/kernel/cpu/mce/therm_throt.c
+++ b/drivers/thermal/intel/therm_throt.c
@@ -26,13 +26,11 @@
#include <linux/cpu.h>

#include <asm/processor.h>
+#include <asm/thermal.h>
#include <asm/traps.h>
#include <asm/apic.h>
-#include <asm/mce.h>
+#include <asm/irq.h>
#include <asm/msr.h>
-#include <asm/trace/irq_vectors.h>
-
-#include "internal.h"

/* How long to wait between reporting thermal events */
#define CHECK_INTERVAL (300 * HZ)
@@ -606,23 +604,6 @@ static void intel_thermal_interrupt(void)
}
}

-static void unexpected_thermal_interrupt(void)
-{
- pr_err("CPU%d: Unexpected LVT thermal interrupt!\n",
- smp_processor_id());
-}
-
-static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
-
-DEFINE_IDTENTRY_SYSVEC(sysvec_thermal)
-{
- trace_thermal_apic_entry(THERMAL_APIC_VECTOR);
- inc_irq_stat(irq_thermal_count);
- smp_thermal_vector();
- trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
- ack_APIC_irq();
-}
-
/* Thermal monitoring depends on APIC, ACPI and clock modulation */
static int intel_thermal_supported(struct cpuinfo_x86 *c)
{
@@ -718,7 +699,7 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
| PACKAGE_THERM_INT_HIGH_ENABLE), h);
}

- smp_thermal_vector = intel_thermal_interrupt;
+ thermal_set_handler(intel_thermal_interrupt);

rdmsr(MSR_IA32_MISC_ENABLE, l, h);
wrmsr(MSR_IA32_MISC_ENABLE, l | MSR_IA32_MISC_ENABLE_TM1, h);
diff --git a/drivers/thermal/intel/x86_pkg_temp_thermal.c b/drivers/thermal/intel/x86_pkg_temp_thermal.c
index b81c33202f41..090f9176ba62 100644
--- a/drivers/thermal/intel/x86_pkg_temp_thermal.c
+++ b/drivers/thermal/intel/x86_pkg_temp_thermal.c
@@ -17,8 +17,9 @@
#include <linux/pm.h>
#include <linux/thermal.h>
#include <linux/debugfs.h>
+
#include <asm/cpu_device_id.h>
-#include <asm/mce.h>
+#include <asm/thermal.h>

/*
* Rate control delay: Idea is to introduce denounce effect
--
2.29.2