[PATCH v2 23/25] irqchip: Kill irq-partition-percpu

Marc Zyngier
2025-09-15T08:57:19Z

This code is now completely unused, and nobody will ever miss it.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/Kconfig | 3 -
drivers/irqchip/Makefile | 1 -
drivers/irqchip/irq-partition-percpu.c | 241 -------------------
include/linux/irqchip/irq-partition-percpu.h | 53 ----
4 files changed, 298 deletions(-)
delete mode 100644 drivers/irqchip/irq-partition-percpu.c
delete mode 100644 include/linux/irqchip/irq-partition-percpu.h

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index c31d2f99d7b91..4bb25d21f6e9b 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -450,9 +450,6 @@ config LS_SCFG_MSI
depends on PCI_MSI
select IRQ_MSI_LIB

-config PARTITION_PERCPU
- bool
-
config STM32MP_EXTI
tristate "STM32MP extended interrupts and event controller"
depends on (ARCH_STM32 && !ARM_SINGLE_ARMV7M) || COMPILE_TEST
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 93e3ced023bb8..da429f3e29ec7 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -36,7 +36,6 @@ obj-$(CONFIG_ARM_GIC_V3) += irq-gic-v3.o irq-gic-v3-mbi.o irq-gic-common.o
obj-$(CONFIG_ARM_GIC_ITS_PARENT) += irq-gic-its-msi-parent.o
obj-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v4.o
obj-$(CONFIG_ARM_GIC_V3_ITS_FSL_MC) += irq-gic-v3-its-fsl-mc-msi.o
-obj-$(CONFIG_PARTITION_PERCPU) += irq-partition-percpu.o
obj-$(CONFIG_ARM_GIC_V5) += irq-gic-v5.o irq-gic-v5-irs.o irq-gic-v5-its.o \
irq-gic-v5-iwb.o
obj-$(CONFIG_HISILICON_IRQ_MBIGEN) += irq-mbigen.o
diff --git a/drivers/irqchip/irq-partition-percpu.c b/drivers/irqchip/irq-partition-percpu.c
deleted file mode 100644
index 4441ffe149ea0..0000000000000
--- a/drivers/irqchip/irq-partition-percpu.c
+++ /dev/null
@@ -1,241 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2016 ARM Limited, All Rights Reserved.
- * Author: Marc Zyngier <marc.zyngier@arm.com>
- */
-
-#include <linux/bitops.h>
-#include <linux/interrupt.h>
-#include <linux/irqchip.h>
-#include <linux/irqchip/chained_irq.h>
-#include <linux/irqchip/irq-partition-percpu.h>
-#include <linux/irqdomain.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-
-struct partition_desc {
- int nr_parts;
- struct partition_affinity *parts;
- struct irq_domain *domain;
- struct irq_desc *chained_desc;
- unsigned long *bitmap;
- struct irq_domain_ops ops;
-};
-
-static bool partition_check_cpu(struct partition_desc *part,
- unsigned int cpu, unsigned int hwirq)
-{
- return cpumask_test_cpu(cpu, &part->parts[hwirq].mask);
-}
-
-static void partition_irq_mask(struct irq_data *d)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- if (partition_check_cpu(part, smp_processor_id(), d->hwirq) &&
- chip->irq_mask)
- chip->irq_mask(data);
-}
-
-static void partition_irq_unmask(struct irq_data *d)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- if (partition_check_cpu(part, smp_processor_id(), d->hwirq) &&
- chip->irq_unmask)
- chip->irq_unmask(data);
-}
-
-static int partition_irq_set_irqchip_state(struct irq_data *d,
- enum irqchip_irq_state which,
- bool val)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- if (partition_check_cpu(part, smp_processor_id(), d->hwirq) &&
- chip->irq_set_irqchip_state)
- return chip->irq_set_irqchip_state(data, which, val);
-
- return -EINVAL;
-}
-
-static int partition_irq_get_irqchip_state(struct irq_data *d,
- enum irqchip_irq_state which,
- bool *val)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- if (partition_check_cpu(part, smp_processor_id(), d->hwirq) &&
- chip->irq_get_irqchip_state)
- return chip->irq_get_irqchip_state(data, which, val);
-
- return -EINVAL;
-}
-
-static int partition_irq_set_type(struct irq_data *d, unsigned int type)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- if (chip->irq_set_type)
- return chip->irq_set_type(data, type);
-
- return -EINVAL;
-}
-
-static void partition_irq_print_chip(struct irq_data *d, struct seq_file *p)
-{
- struct partition_desc *part = irq_data_get_irq_chip_data(d);
- struct irq_chip *chip = irq_desc_get_chip(part->chained_desc);
- struct irq_data *data = irq_desc_get_irq_data(part->chained_desc);
-
- seq_printf(p, "%5s-%lu", chip->name, data->hwirq);
-}
-
-static struct irq_chip partition_irq_chip = {
- .irq_mask = partition_irq_mask,
- .irq_unmask = partition_irq_unmask,
- .irq_set_type = partition_irq_set_type,
- .irq_get_irqchip_state = partition_irq_get_irqchip_state,
- .irq_set_irqchip_state = partition_irq_set_irqchip_state,
- .irq_print_chip = partition_irq_print_chip,
-};
-
-static void partition_handle_irq(struct irq_desc *desc)
-{
- struct partition_desc *part = irq_desc_get_handler_data(desc);
- struct irq_chip *chip = irq_desc_get_chip(desc);
- int cpu = smp_processor_id();
- int hwirq;
-
- chained_irq_enter(chip, desc);
-
- for_each_set_bit(hwirq, part->bitmap, part->nr_parts) {
- if (partition_check_cpu(part, cpu, hwirq))
- break;
- }
-
- if (unlikely(hwirq == part->nr_parts))
- handle_bad_irq(desc);
- else
- generic_handle_domain_irq(part->domain, hwirq);
-
- chained_irq_exit(chip, desc);
-}
-
-static int partition_domain_alloc(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs, void *arg)
-{
- int ret;
- irq_hw_number_t hwirq;
- unsigned int type;
- struct irq_fwspec *fwspec = arg;
- struct partition_desc *part;
-
- BUG_ON(nr_irqs != 1);
- ret = domain->ops->translate(domain, fwspec, &hwirq, &type);
- if (ret)
- return ret;
-
- part = domain->host_data;
-
- set_bit(hwirq, part->bitmap);
- irq_set_chained_handler_and_data(irq_desc_get_irq(part->chained_desc),
- partition_handle_irq, part);
- irq_set_percpu_devid_partition(virq, &part->parts[hwirq].mask);
- irq_domain_set_info(domain, virq, hwirq, &partition_irq_chip, part,
- handle_percpu_devid_irq, NULL, NULL);
- irq_set_status_flags(virq, IRQ_NOAUTOEN);
-
- return 0;
-}
-
-static void partition_domain_free(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs)
-{
- struct irq_data *d;
-
- BUG_ON(nr_irqs != 1);
-
- d = irq_domain_get_irq_data(domain, virq);
- irq_set_handler(virq, NULL);
- irq_domain_reset_irq_data(d);
-}
-
-int partition_translate_id(struct partition_desc *desc, void *partition_id)
-{
- struct partition_affinity *part = NULL;
- int i;
-
- for (i = 0; i < desc->nr_parts; i++) {
- if (desc->parts[i].partition_id == partition_id) {
- part = &desc->parts[i];
- break;
- }
- }
-
- if (WARN_ON(!part)) {
- pr_err("Failed to find partition\n");
- return -EINVAL;
- }
-
- return i;
-}
-
-struct partition_desc *partition_create_desc(struct fwnode_handle *fwnode,
- struct partition_affinity *parts,
- int nr_parts,
- int chained_irq,
- const struct irq_domain_ops *ops)
-{
- struct partition_desc *desc;
- struct irq_domain *d;
-
- BUG_ON(!ops->select || !ops->translate);
-
- desc = kzalloc(sizeof(*desc), GFP_KERNEL);
- if (!desc)
- return NULL;
-
- desc->ops = *ops;
- desc->ops.free = partition_domain_free;
- desc->ops.alloc = partition_domain_alloc;
-
- d = irq_domain_create_linear(fwnode, nr_parts, &desc->ops, desc);
- if (!d)
- goto out;
- desc->domain = d;
-
- desc->bitmap = bitmap_zalloc(nr_parts, GFP_KERNEL);
- if (WARN_ON(!desc->bitmap))
- goto out;
-
- desc->chained_desc = irq_to_desc(chained_irq);
- desc->nr_parts = nr_parts;
- desc->parts = parts;
-
- return desc;
-out:
- if (d)
- irq_domain_remove(d);
- kfree(desc);
-
- return NULL;
-}
-
-struct irq_domain *partition_get_domain(struct partition_desc *dsc)
-{
- if (dsc)
- return dsc->domain;
-
- return NULL;
-}
diff --git a/include/linux/irqchip/irq-partition-percpu.h b/include/linux/irqchip/irq-partition-percpu.h
deleted file mode 100644
index b35ee22c278f8..0000000000000
--- a/include/linux/irqchip/irq-partition-percpu.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2016 ARM Limited, All Rights Reserved.
- * Author: Marc Zyngier <marc.zyngier@arm.com>
- */
-
-#ifndef __LINUX_IRQCHIP_IRQ_PARTITION_PERCPU_H
-#define __LINUX_IRQCHIP_IRQ_PARTITION_PERCPU_H
-
-#include <linux/fwnode.h>
-#include <linux/cpumask_types.h>
-#include <linux/irqdomain.h>
-
-struct partition_affinity {
- cpumask_t mask;
- void *partition_id;
-};
-
-struct partition_desc;
-
-#ifdef CONFIG_PARTITION_PERCPU
-int partition_translate_id(struct partition_desc *desc, void *partition_id);
-struct partition_desc *partition_create_desc(struct fwnode_handle *fwnode,
- struct partition_affinity *parts,
- int nr_parts,
- int chained_irq,
- const struct irq_domain_ops *ops);
-struct irq_domain *partition_get_domain(struct partition_desc *dsc);
-#else
-static inline int partition_translate_id(struct partition_desc *desc,
- void *partition_id)
-{
- return -EINVAL;
-}
-
-static inline
-struct partition_desc *partition_create_desc(struct fwnode_handle *fwnode,
- struct partition_affinity *parts,
- int nr_parts,
- int chained_irq,
- const struct irq_domain_ops *ops)
-{
- return NULL;
-}
-
-static inline
-struct irq_domain *partition_get_domain(struct partition_desc *dsc)
-{
- return NULL;
-}
-#endif
-
-#endif /* __LINUX_IRQCHIP_IRQ_PARTITION_PERCPU_H */
--
2.39.2