+++ /dev/null
-// 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;
-}
projects / thirdparty / kernel / linux.git / commitdiff
