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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697// SPDX-License-Identifier: GPL-2.0/* * MSI framework for platform devices * * Copyright (C) 2015 ARM Limited, All Rights Reserved. * Author: Marc Zyngier <marc.zyngier@arm.com> * Copyright (C) 2022 Linutronix GmbH */
#include <linux/device.h>#include <linux/irqdomain.h>#include <linux/msi.h>
/* * This indirection can go when platform_device_msi_init_and_alloc_irqs() * is switched to a proper irq_chip::irq_write_msi_msg() callback. Keep it * simple for now. */static void platform_msi_write_msi_msg(struct irq_data *d, struct msi_msg *msg){ irq_write_msi_msg_t cb = d->chip_data;
cb(irq_data_get_msi_desc(d), msg);}
static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc){ arg->desc = desc; arg->hwirq = desc->msi_index;}
static const struct msi_domain_template platform_msi_template = { .chip = { .name = "pMSI", .irq_mask = irq_chip_mask_parent, .irq_unmask = irq_chip_unmask_parent, .irq_write_msi_msg = platform_msi_write_msi_msg, /* The rest is filled in by the platform MSI parent */ },
.ops = { .set_desc = platform_msi_set_desc, },
.info = { .bus_token = DOMAIN_BUS_DEVICE_MSI, },};
/** * platform_device_msi_init_and_alloc_irqs - Initialize platform device MSI * and allocate interrupts for @dev * @dev: The device for which to allocate interrupts * @nvec: The number of interrupts to allocate * @write_msi_msg: Callback to write an interrupt message for @dev * * Returns: * Zero for success, or an error code in case of failure * * This creates a MSI domain on @dev which has @dev->msi.domain as * parent. The parent domain sets up the new domain. The domain has * a fixed size of @nvec. The domain is managed by devres and will * be removed when the device is removed. */int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg){ struct irq_domain *domain = dev->msi.domain;
if (!domain || !write_msi_msg) return -EINVAL;
/* * @write_msi_msg is stored in the resulting msi_domain_info::data. * The underlying domain creation mechanism will assign that * callback to the resulting irq chip. */ if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, &platform_msi_template, nvec, NULL, write_msi_msg)) return -ENODEV;
return msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1);}EXPORT_SYMBOL_GPL(platform_device_msi_init_and_alloc_irqs);
/** * platform_device_msi_free_irqs_all - Free all interrupts for @dev * @dev: The device for which to free interrupts */void platform_device_msi_free_irqs_all(struct device *dev){ msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN); msi_remove_device_irq_domain(dev, MSI_DEFAULT_DOMAIN);}EXPORT_SYMBOL_GPL(platform_device_msi_free_irqs_all);