// SPDX-License-Identifier: GPL-2.0 /* * MSI framework for platform devices * * Copyright (C) 2015 ARM Limited, All Rights Reserved. * Author: Marc Zyngier <[email protected]> * 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) { … } static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { … } static const struct msi_domain_template platform_msi_template = …; /** * 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. * * Note: For migration purposes this falls back to the original platform_msi code * up to the point where all platforms have been converted to the MSI * parent model. */ int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…);
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