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e989424899
No more users! Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20240623142235.943295676@linutronix.de
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MSI framework for platform devices
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*
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* Copyright (C) 2015 ARM Limited, All Rights Reserved.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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* Copyright (C) 2022 Linutronix GmbH
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*/
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#include <linux/device.h>
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#include <linux/irqdomain.h>
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#include <linux/msi.h>
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/*
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* This indirection can go when platform_device_msi_init_and_alloc_irqs()
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* is switched to a proper irq_chip::irq_write_msi_msg() callback. Keep it
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* simple for now.
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*/
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static void platform_msi_write_msi_msg(struct irq_data *d, struct msi_msg *msg)
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{
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irq_write_msi_msg_t cb = d->chip_data;
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cb(irq_data_get_msi_desc(d), msg);
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}
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static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
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{
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arg->desc = desc;
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arg->hwirq = desc->msi_index;
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}
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static const struct msi_domain_template platform_msi_template = {
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.chip = {
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.name = "pMSI",
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.irq_mask = irq_chip_mask_parent,
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.irq_unmask = irq_chip_unmask_parent,
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.irq_write_msi_msg = platform_msi_write_msi_msg,
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/* The rest is filled in by the platform MSI parent */
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},
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.ops = {
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.set_desc = platform_msi_set_desc,
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},
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.info = {
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.bus_token = DOMAIN_BUS_DEVICE_MSI,
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},
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};
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/**
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* platform_device_msi_init_and_alloc_irqs - Initialize platform device MSI
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* and allocate interrupts for @dev
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* @dev: The device for which to allocate interrupts
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* @nvec: The number of interrupts to allocate
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* @write_msi_msg: Callback to write an interrupt message for @dev
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*
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* Returns:
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* Zero for success, or an error code in case of failure
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*
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* This creates a MSI domain on @dev which has @dev->msi.domain as
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* parent. The parent domain sets up the new domain. The domain has
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* a fixed size of @nvec. The domain is managed by devres and will
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* be removed when the device is removed.
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*
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* Note: For migration purposes this falls back to the original platform_msi code
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* up to the point where all platforms have been converted to the MSI
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* parent model.
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*/
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int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg)
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{
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struct irq_domain *domain = dev->msi.domain;
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if (!domain || !write_msi_msg)
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return -EINVAL;
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/*
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* @write_msi_msg is stored in the resulting msi_domain_info::data.
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* The underlying domain creation mechanism will assign that
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* callback to the resulting irq chip.
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*/
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if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN,
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&platform_msi_template,
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nvec, NULL, write_msi_msg))
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return -ENODEV;
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return msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1);
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}
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EXPORT_SYMBOL_GPL(platform_device_msi_init_and_alloc_irqs);
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/**
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* platform_device_msi_free_irqs_all - Free all interrupts for @dev
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* @dev: The device for which to free interrupts
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*/
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void platform_device_msi_free_irqs_all(struct device *dev)
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{
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msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
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}
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EXPORT_SYMBOL_GPL(platform_device_msi_free_irqs_all);
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