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Improve interrupt handling during machine kexec

PATCH Applied Eliav Farber 4 participants 7 messages Dec 4, 2024 – Feb 3, 2025

Subsystems (5)
Arm (32-bit) PowerPC RISC-V arm64 +1 more subsystems
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#0 lore raw

v6 cover Improve interrupt handling during machine kexec

This patch series focuses on improving the machine_kexec_mask_interrupts() function by consolidating its implementation and optimizing its behavior to avoid redundant interrupt masking.

Patch Summary:
[PATCH v6 1/2] Move machine_kexec_mask_interrupts() to kernel/irq/kexec.c,
removing duplicate architecture-specific implementations.
[PATCH v6 2/2] Refine machine_kexec_mask_interrupts() to avoid re-masking
already-masked interrupts, resolving specific warnings triggered in GPIO IRQ flows.

Changes between v5 and v6:
- Change GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD to not be user selectable.

Changes between v4 and v5:
- The function machine_kexec_mask_interrupts() has been moved from kernel/kexec_core.c to a new file kernel/irq/kexec.c.
- A new configuration option, GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, has been added.
- The parameters for the machine_kexec_mask_interrupts() function have been defined in reverse Christmas Tree style.
- The comment explaining the call to irq_set_irqchip_state() has been improved for clarity.
- The phrase 'This patch' has been removed from the commit message.

Changes between v3 and v4:
- Add missing <linux/irqdesc.h> and <linux/irq.h> includes.

Eliav Farber (2):
kexec: Consolidate machine_kexec_mask_interrupts() implementation
kexec: Prevent redundant IRQ masking by checking state before shutdown

 arch/arm/kernel/machine_kexec.c   | 23 --------------------
 arch/arm64/Kconfig                |  1 +
 arch/arm64/kernel/machine_kexec.c | 31 --------------------------
 arch/powerpc/include/asm/kexec.h  |  1 -
 arch/powerpc/kexec/core.c         | 22 -------------------
 arch/powerpc/kexec/core_32.c      |  1 +
 arch/riscv/kernel/machine_kexec.c | 23 --------------------
 include/linux/irq.h               |  3 +++
 kernel/irq/Kconfig                |  6 ++++++
 kernel/irq/Makefile               |  2 +-
 kernel/irq/kexec.c                | 36 +++++++++++++++++++++++++++++++
 11 files changed, 48 insertions(+), 101 deletions(-)
 create mode 100644 kernel/irq/kexec.c
Signature · 1 line
2.40.1
#1 lore raw

PATCH v6 1/2 kexec: Consolidate machine_kexec_mask_interrupts() implementation

Consolidate the machine_kexec_mask_interrupts implementation into a common function located in a new file: kernel/irq/kexec.c. This removes duplicate implementations from architecture-specific files in arch/arm, arch/arm64, arch/powerpc, and arch/riscv, reducing code duplication and improving maintainability.

The new implementation retains architecture-specific behavior for CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implemented for ARM64. When enabled (currently for ARM64), it clears the active state of interrupts forwarded to virtual machines (VMs) before handling other interrupt masking operations.

---
V5 -> V6:
- Change GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD to not be user selectable.

 arch/arm/kernel/machine_kexec.c   | 23 ------------------
 arch/arm64/Kconfig                |  1 +
 arch/arm64/kernel/machine_kexec.c | 31 ------------------------
 arch/powerpc/include/asm/kexec.h  |  1 -
 arch/powerpc/kexec/core.c         | 22 -----------------
 arch/powerpc/kexec/core_32.c      |  1 +
 arch/riscv/kernel/machine_kexec.c | 23 ------------------
 include/linux/irq.h               |  3 +++
 kernel/irq/Kconfig                |  6 +++++
 kernel/irq/Makefile               |  2 +-
 kernel/irq/kexec.c                | 40 +++++++++++++++++++++++++++++++
 11 files changed, 52 insertions(+), 101 deletions(-)
 create mode 100644 kernel/irq/kexec.c
arch/arm/kernel/machine_kexec.c +0 -23
index 80ceb5bd2680..dd430477e7c1 100644
@@ -127,29 +127,6 @@ void crash_smp_send_stop(void)
 	cpus_stopped = 1;
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 void machine_crash_shutdown(struct pt_regs *regs)
 {
 	local_irq_disable();
arch/arm64/Kconfig +1 -0
index 100570a048c5..dcc3551cf6c2 100644
@@ -149,6 +149,7 @@ config ARM64
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IOREMAP
 	select GENERIC_IRQ_IPI
+	select GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_IRQ_SHOW_LEVEL
arch/arm64/kernel/machine_kexec.c +0 -31
index 82e2203d86a3..6f121a0164a4 100644
@@ -207,37 +207,6 @@ void machine_kexec(struct kimage *kimage)
 	BUG(); /* Should never get here. */
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-		int ret;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		/*
-		 * First try to remove the active state. If this
-		 * fails, try to EOI the interrupt.
-		 */
-		ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
-
-		if (ret && irqd_irq_inprogress(&desc->irq_data) &&
-		    chip->irq_eoi)
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 /**
  * machine_crash_shutdown - shutdown non-crashing cpus and save registers
  */
arch/powerpc/include/asm/kexec.h +0 -1
index 270ee93a0f7d..601e569303e1 100644
@@ -61,7 +61,6 @@ struct pt_regs;
 extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
 					  master to copy new code to 0 */
 extern void default_machine_kexec(struct kimage *image);
-extern void machine_kexec_mask_interrupts(void);
 
 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
 			 unsigned long start_address) __noreturn;
arch/powerpc/kexec/core.c +0 -22
index b8333a49ea5d..58a930a47422 100644
@@ -22,28 +22,6 @@
 #include <asm/setup.h>
 #include <asm/firmware.h>
 
-void machine_kexec_mask_interrupts(void) {
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 #ifdef CONFIG_CRASH_DUMP
 void machine_crash_shutdown(struct pt_regs *regs)
 {
arch/powerpc/kexec/core_32.c +1 -0
index c95f96850c9e..deb28eb44f30 100644
@@ -7,6 +7,7 @@
  * Copyright (C) 2005 IBM Corporation.
  */
 
+#include <linux/irq.h>
 #include <linux/kexec.h>
 #include <linux/mm.h>
 #include <linux/string.h>
arch/riscv/kernel/machine_kexec.c +0 -23
index 3c830a6f7ef4..2306ce3e5f22 100644
@@ -114,29 +114,6 @@ void machine_shutdown(void)
 #endif
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 /*
  * machine_crash_shutdown - Prepare to kexec after a kernel crash
  *
include/linux/irq.h +3 -0
index fa711f80957b..25f51bf3c351 100644
@@ -694,6 +694,9 @@ extern int irq_chip_request_resources_parent(struct irq_data *data);
 extern void irq_chip_release_resources_parent(struct irq_data *data);
 #endif
 
+/* Disable or mask interrupts during a kernel kexec */
+extern void machine_kexec_mask_interrupts(void);
+
 /* Handling of unhandled and spurious interrupts: */
 extern void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret);
 
kernel/irq/Kconfig +6 -0
index 529adb1f5859..875f25ed6f71 100644
@@ -141,6 +141,12 @@ config GENERIC_IRQ_DEBUGFS
 
 	  If you don't know what to do here, say N.
 
+# Clear forwarded VM interrupts during kexec.
+# This option ensures the kernel clears active states for interrupts
+# forwarded to virtual machines (VMs) during a machine kexec.
+config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
+	bool
+
 endmenu
 
 config GENERIC_IRQ_MULTI_HANDLER
kernel/irq/Makefile +1 -1
index f19d3080bf11..c0f44c06d69d 100644
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o
+obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o kexec.o
 obj-$(CONFIG_IRQ_TIMINGS) += timings.o
 ifeq ($(CONFIG_TEST_IRQ_TIMINGS),y)
 	CFLAGS_timings.o += -DDEBUG
kernel/irq/kexec.c new file +40 -0
new file mode 100644
index 000000000000..0f9548c1708d
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqnr.h>
+
+#include "internals.h"
+
+void machine_kexec_mask_interrupts(void)
+{
+	struct irq_desc *desc;
+	unsigned int i;
+
+	for_each_irq_desc(i, desc) {
+		struct irq_chip *chip;
+		int check_eoi = 1;
+
+		chip = irq_desc_get_chip(desc);
+		if (!chip)
+			continue;
+
+		if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) {
+			/*
+			 * First try to remove the active state from an interrupt which is forwarded
+			 * to a VM. If the interrupt is not forwarded, try to EOI the interrupt.
+			 */
+			check_eoi = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
+		}
+
+		if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
+			chip->irq_eoi(&desc->irq_data);
+
+		if (chip->irq_mask)
+			chip->irq_mask(&desc->irq_data);
+
+		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
+			chip->irq_disable(&desc->irq_data);
+	}
+}
Signature · 1 line
2.40.1
merge bot Applied
#2 lore raw

[tip: irq/core] kexec: Consolidate machine_kexec_mask_interrupts() implementation

The following commit has been merged into the irq/core branch of tip:

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     bad6722e478f5b17a5ceb039dfb4c680cf2c0b48
Gitweb:        https://git.kernel.org/tip/bad6722e478f5b17a5ceb039dfb4c680cf2c0b48
Author:        Eliav Farber <[email protected]>
AuthorDate:    Wed, 04 Dec 2024 14:20:02 
Committer:     Thomas Gleixner <[email protected]>
CommitterDate: Wed, 11 Dec 2024 20:32:34 +01:00

kexec: Consolidate machine_kexec_mask_interrupts() implementation

Consolidate the machine_kexec_mask_interrupts implementation into a common function located in a new file: kernel/irq/kexec.c. This removes duplicate implementations from architecture-specific files in arch/arm, arch/arm64, arch/powerpc, and arch/riscv, reducing code duplication and improving maintainability.

The new implementation retains architecture-specific behavior for CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implemented for ARM64. When enabled (currently for ARM64), it clears the active state of interrupts forwarded to virtual machines (VMs) before handling other interrupt masking operations.

---
 arch/arm/kernel/machine_kexec.c   | 23 +-----------------
 arch/arm64/Kconfig                |  1 +-
 arch/arm64/kernel/machine_kexec.c | 31 +-----------------------
 arch/powerpc/include/asm/kexec.h  |  1 +-
 arch/powerpc/kexec/core.c         | 22 +-----------------
 arch/powerpc/kexec/core_32.c      |  1 +-
 arch/riscv/kernel/machine_kexec.c | 23 +-----------------
 include/linux/irq.h               |  3 ++-
 kernel/irq/Kconfig                |  6 +++++-
 kernel/irq/Makefile               |  2 +-
 kernel/irq/kexec.c                | 40 ++++++++++++++++++++++++++++++-
 11 files changed, 52 insertions(+), 101 deletions(-)
 create mode 100644 kernel/irq/kexec.c
arch/arm/kernel/machine_kexec.c +0 -23
index 80ceb5b..dd43047 100644
@@ -127,29 +127,6 @@ void crash_smp_send_stop(void)
 	cpus_stopped = 1;
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 void machine_crash_shutdown(struct pt_regs *regs)
 {
 	local_irq_disable();
arch/arm64/Kconfig +1 -0
index 100570a..dcc3551 100644
@@ -149,6 +149,7 @@ config ARM64
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IOREMAP
 	select GENERIC_IRQ_IPI
+	select GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_IRQ_SHOW_LEVEL
arch/arm64/kernel/machine_kexec.c +0 -31
index 82e2203..6f121a0 100644
@@ -207,37 +207,6 @@ void machine_kexec(struct kimage *kimage)
 	BUG(); /* Should never get here. */
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-		int ret;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		/*
-		 * First try to remove the active state. If this
-		 * fails, try to EOI the interrupt.
-		 */
-		ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
-
-		if (ret && irqd_irq_inprogress(&desc->irq_data) &&
-		    chip->irq_eoi)
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 /**
  * machine_crash_shutdown - shutdown non-crashing cpus and save registers
  */
arch/powerpc/include/asm/kexec.h +0 -1
index 270ee93..601e569 100644
@@ -61,7 +61,6 @@ struct pt_regs;
 extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
 					  master to copy new code to 0 */
 extern void default_machine_kexec(struct kimage *image);
-extern void machine_kexec_mask_interrupts(void);
 
 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
 			 unsigned long start_address) __noreturn;
arch/powerpc/kexec/core.c +0 -22
index b8333a4..58a930a 100644
@@ -22,28 +22,6 @@
 #include <asm/setup.h>
 #include <asm/firmware.h>
 
-void machine_kexec_mask_interrupts(void) {
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 #ifdef CONFIG_CRASH_DUMP
 void machine_crash_shutdown(struct pt_regs *regs)
 {
arch/powerpc/kexec/core_32.c +1 -0
index c95f968..deb28eb 100644
@@ -7,6 +7,7 @@
  * Copyright (C) 2005 IBM Corporation.
  */
 
+#include <linux/irq.h>
 #include <linux/kexec.h>
 #include <linux/mm.h>
 #include <linux/string.h>
arch/riscv/kernel/machine_kexec.c +0 -23
index 3c830a6..2306ce3 100644
@@ -114,29 +114,6 @@ void machine_shutdown(void)
 #endif
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 /*
  * machine_crash_shutdown - Prepare to kexec after a kernel crash
  *
include/linux/irq.h +3 -0
index fa711f8..25f51bf 100644
@@ -694,6 +694,9 @@ extern int irq_chip_request_resources_parent(struct irq_data *data);
 extern void irq_chip_release_resources_parent(struct irq_data *data);
 #endif
 
+/* Disable or mask interrupts during a kernel kexec */
+extern void machine_kexec_mask_interrupts(void);
+
 /* Handling of unhandled and spurious interrupts: */
 extern void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret);
 
kernel/irq/Kconfig +6 -0
index 529adb1..875f25e 100644
@@ -141,6 +141,12 @@ config GENERIC_IRQ_DEBUGFS
 
 	  If you don't know what to do here, say N.
 
+# Clear forwarded VM interrupts during kexec.
+# This option ensures the kernel clears active states for interrupts
+# forwarded to virtual machines (VMs) during a machine kexec.
+config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
+	bool
+
 endmenu
 
 config GENERIC_IRQ_MULTI_HANDLER
kernel/irq/Makefile +1 -1
index f19d308..c0f44c0 100644
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o
+obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o kexec.o
 obj-$(CONFIG_IRQ_TIMINGS) += timings.o
 ifeq ($(CONFIG_TEST_IRQ_TIMINGS),y)
 	CFLAGS_timings.o += -DDEBUG
kernel/irq/kexec.c new file +40 -0
new file mode 100644
index 0000000..0f9548c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqnr.h>
+
+#include "internals.h"
+
+void machine_kexec_mask_interrupts(void)
+{
+	struct irq_desc *desc;
+	unsigned int i;
+
+	for_each_irq_desc(i, desc) {
+		struct irq_chip *chip;
+		int check_eoi = 1;
+
+		chip = irq_desc_get_chip(desc);
+		if (!chip)
+			continue;
+
+		if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) {
+			/*
+			 * First try to remove the active state from an interrupt which is forwarded
+			 * to a VM. If the interrupt is not forwarded, try to EOI the interrupt.
+			 */
+			check_eoi = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
+		}
+
+		if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
+			chip->irq_eoi(&desc->irq_data);
+
+		if (chip->irq_mask)
+			chip->irq_mask(&desc->irq_data);
+
+		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
+			chip->irq_disable(&desc->irq_data);
+	}
+}
maintainer
#3 lore raw

Re: [PATCH v6 1/2] kexec: Consolidate machine_kexec_mask_interrupts() implementation

In reply to Eliav Farber
Quoted 70 lines · Eliav Farber

Consolidate the machine_kexec_mask_interrupts implementation into a common function located in a new file: kernel/irq/kexec.c. This removes duplicate implementations from architecture-specific files in arch/arm, arch/arm64, arch/powerpc, and arch/riscv, reducing code duplication and improving maintainability.

The new implementation retains architecture-specific behavior for CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implemented for ARM64. When enabled (currently for ARM64), it clears the active state of interrupts forwarded to virtual machines (VMs) before handling other interrupt masking operations.

---
V5 -> V6:
- Change GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD to not be user selectable.

 arch/arm/kernel/machine_kexec.c   | 23 ------------------
 arch/arm64/Kconfig                |  1 +
 arch/arm64/kernel/machine_kexec.c | 31 ------------------------
 arch/powerpc/include/asm/kexec.h  |  1 -
 arch/powerpc/kexec/core.c         | 22 -----------------
 arch/powerpc/kexec/core_32.c      |  1 +
 arch/riscv/kernel/machine_kexec.c | 23 ------------------
 include/linux/irq.h               |  3 +++
 kernel/irq/Kconfig                |  6 +++++
 kernel/irq/Makefile               |  2 +-
 kernel/irq/kexec.c                | 40 +++++++++++++++++++++++++++++++
 11 files changed, 52 insertions(+), 101 deletions(-)
 create mode 100644 kernel/irq/kexec.c
arch/arm/kernel/machine_kexec.c +0 -23
index 80ceb5bd2680..dd430477e7c1 100644
@@ -127,29 +127,6 @@ void crash_smp_send_stop(void)
 	cpus_stopped = 1;
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
-			chip->irq_eoi(&desc->irq_data);
-
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
-	}
-}
-
 void machine_crash_shutdown(struct pt_regs *regs)
 {
 	local_irq_disable();
arch/arm64/Kconfig +0 -0
index 100570a048c5..dcc3551cf6c2 100644

arch/arm64/Kconfig config ARM64 · line 152

Quoted 4 lines
arch/arm64/Kconfig +1 -0
@@ -149,6 +149,7 @@ config ARM64
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IOREMAP
 	select GENERIC_IRQ_IPI
+	select GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD

Is this really specific to VMs? In the new code, it's just controlling this part of the old code:

Quoted 16 lines
arch/arm64/kernel/machine_kexec.c +0 -8
index 82e2203d86a3..6f121a0164a4 100644
@@ -207,37 +207,6 @@ void machine_kexec(struct kimage *kimage)
 	BUG(); /* Should never get here. */
 }
 
-static void machine_kexec_mask_interrupts(void)
-{
-	unsigned int i;
-	struct irq_desc *desc;
-
-	for_each_irq_desc(i, desc) {
-		struct irq_chip *chip;
-		int ret;

arch/arm64/kernel/machine_kexec.c void machine_kexec(struct kimage *kimage) · line 227

Quoted 10 lines
arch/arm64/kernel/machine_kexec.c +0 -10
-
-		chip = irq_desc_get_chip(desc);
-		if (!chip)
-			continue;
-
-		/*
-		 * First try to remove the active state. If this
-		 * fails, try to EOI the interrupt.
-		 */
-		ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);

which is about active interrupts. Why can't that happen for the host?

Will

#4 lore raw

PATCH v6 2/2 kexec: Prevent redundant IRQ masking by checking state before shutdown

In reply to Eliav Farber

During machine kexec, the function machine_kexec_mask_interrupts() is responsible for disabling or masking all interrupts. While the irq_disable hook ensures that an already-disabled IRQ is not disabled again, the current implementation unconditionally invokes the irq_mask() function for every interrupt descriptor, even when the interrupt is already masked.

A specific issue was observed in the crash kernel flow after unbinding a device (prior to kexec) that used a GPIO as an IRQ source. The warning was triggered by the gpiochip_disable_irq() function, which attempted to clear the FLAG_IRQ_IS_ENABLED flag when FLAG_USED_AS_IRQ was not set:

```
void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_desc *desc = gpiochip_get_desc(gc, offset);

	if (!IS_ERR(desc) &&
	    !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags)))
		clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
}
```

This issue surfaced after commit a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable") introduced lazy disablement for GPIO IRQs. It replaced disable/enable hooks with mask/unmask hooks. Unlike the disable hook, the mask hook doesn't handle already-masked IRQs.

When a GPIO-IRQ driver is unbound, the IRQ is released, triggering __irq_disable() and irq_state_set_masked(). A subsequent call to machine_kexec_mask_interrupts() re-invokes chip->irq_mask(). This results in a call chain, including gpiochip_irq_mask() and gpiochip_disable_irq(). Since FLAG_USED_AS_IRQ was cleared earlier, a warning occurs.

Replace calls to irq_mask() and irq_disable() hooks with a simplified call to irq_shutdown(), and check if the interrupt is started (irqd_is_started) before calling the shutdown.

---
V5 -> V6: No changes.

 kernel/irq/kexec.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
kernel/irq/kexec.c +2 -6
index 0f9548c1708d..1a3deffe6b5b 100644
@@ -17,7 +17,7 @@ void machine_kexec_mask_interrupts(void)
 		int check_eoi = 1;
 
 		chip = irq_desc_get_chip(desc);
-		if (!chip)
+		if (!chip || !irqd_is_started(&desc->irq_data))
 			continue;
 
 		if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) {
@@ -31,10 +31,6 @@ void machine_kexec_mask_interrupts(void)
 		if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
 			chip->irq_eoi(&desc->irq_data);
 
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
+		irq_shutdown(desc);
 	}
 }
Signature · 1 line
2.40.1
merge bot Applied
#5 lore raw

[tip: irq/core] genirq/kexec: Prevent redundant IRQ masking by checking state before shutdown

The following commit has been merged into the irq/core branch of tip:

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     b4706d814921cc2df7bb59ad8f9ee84855a4f0c4
Gitweb:        https://git.kernel.org/tip/b4706d814921cc2df7bb59ad8f9ee84855a4f0c4
Author:        Eliav Farber <[email protected]>
AuthorDate:    Wed, 04 Dec 2024 14:20:03 
Committer:     Thomas Gleixner <[email protected]>
CommitterDate: Wed, 11 Dec 2024 20:32:34 +01:00

genirq/kexec: Prevent redundant IRQ masking by checking state before shutdown

During machine kexec, machine_kexec_mask_interrupts() is responsible for disabling or masking all interrupts. While the irq_disable() is only invoked when the interrupt is not yet disabled, it unconditionally invokes the irq_mask() callback for every interrupt descriptor, even when the interrupt is already masked or not even started up yet.

A specific issue was observed in the crash kernel flow after unbinding a device (prior to kexec) that used a GPIO as an IRQ source. The warning was triggered by the gpiochip_disable_irq() function, which attempts to clear the FLAG_IRQ_IS_ENABLED flag when FLAG_USED_AS_IRQ was not set.

This issue surfaced after commit a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable") introduced lazy disablement for GPIO IRQs. It replaced disable/enable hooks with mask/unmask hooks. Unlike the disable hook, the mask hook doesn't handle already-masked IRQs.

When a GPIO-IRQ driver is unbound, the IRQ is released, triggering __irq_disable() and irq_state_set_masked(). A subsequent call to machine_kexec_mask_interrupts() re-invokes chip->irq_mask(). This results in a call chain, including gpiochip_irq_mask() and gpiochip_disable_irq(). Since FLAG_USED_AS_IRQ was cleared earlier, the warning is triggered.

Replace the direct invocation of the irq_mask() and irq_disable() callbacks invoking to irq_shutdown(), which handles the cases correct and avoid it all together when the interrupt has never been started up.

---
 kernel/irq/kexec.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
kernel/irq/kexec.c +2 -6
index 0f9548c..1a3deff 100644
@@ -17,7 +17,7 @@ void machine_kexec_mask_interrupts(void)
 		int check_eoi = 1;
 
 		chip = irq_desc_get_chip(desc);
-		if (!chip)
+		if (!chip || !irqd_is_started(&desc->irq_data))
 			continue;
 
 		if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) {
@@ -31,10 +31,6 @@ void machine_kexec_mask_interrupts(void)
 		if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
 			chip->irq_eoi(&desc->irq_data);
 
-		if (chip->irq_mask)
-			chip->irq_mask(&desc->irq_data);
-
-		if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
-			chip->irq_disable(&desc->irq_data);
+		irq_shutdown(desc);
 	}
 }
#6 lore raw
In reply to Eliav Farber
This series was applied to riscv/linux.git (fixes) by Thomas Gleixner <[email protected]>:

Hello:

This series was applied to riscv/linux.git (fixes) by Thomas Gleixner <[email protected]>:

Quoted 4 lines · On Wed, 4 Dec 2024 14:20:01 +0000 you wrote:

This patch series focuses on improving the machine_kexec_mask_interrupts() function by consolidating its implementation and optimizing its behavior to avoid redundant interrupt masking.

Quoted 8 lines

Patch Summary:
[PATCH v6 1/2] Move machine_kexec_mask_interrupts() to kernel/irq/kexec.c,
removing duplicate architecture-specific implementations.
[PATCH v6 2/2] Refine machine_kexec_mask_interrupts() to avoid re-masking
already-masked interrupts, resolving specific warnings triggered in GPIO IRQ flows.

[...]

Here is the summary with links:
- [v6,1/2] kexec: Consolidate machine_kexec_mask_interrupts() implementation

    https://git.kernel.org/riscv/c/bad6722e478f
  - [v6,2/2] kexec: Prevent redundant IRQ masking by checking state before shutdown
    https://git.kernel.org/riscv/c/b4706d814921

You are awesome, thank you!

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