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![Ahmed S. Darwish](/assets/img/avatar_default.png)
Switch to the new domain id aware interfaces to phase out the previous ones. No functional change. Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221124230314.513924920@linutronix.de
351 lines
9.8 KiB
C
351 lines
9.8 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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*/
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/msi.h>
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#include <linux/slab.h>
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#define DEV_ID_SHIFT 21
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#define MAX_DEV_MSIS (1 << (32 - DEV_ID_SHIFT))
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/*
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* Internal data structure containing a (made up, but unique) devid
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* and the callback to write the MSI message.
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*/
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struct platform_msi_priv_data {
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struct device *dev;
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void *host_data;
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msi_alloc_info_t arg;
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irq_write_msi_msg_t write_msg;
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int devid;
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};
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/* The devid allocator */
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static DEFINE_IDA(platform_msi_devid_ida);
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#ifdef GENERIC_MSI_DOMAIN_OPS
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/*
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* Convert an msi_desc to a globaly unique identifier (per-device
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* devid + msi_desc position in the msi_list).
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*/
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static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
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{
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u32 devid = desc->dev->msi.data->platform_data->devid;
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return (devid << (32 - DEV_ID_SHIFT)) | desc->msi_index;
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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 = platform_msi_calc_hwirq(desc);
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}
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static int platform_msi_init(struct irq_domain *domain,
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struct msi_domain_info *info,
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unsigned int virq, irq_hw_number_t hwirq,
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msi_alloc_info_t *arg)
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{
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return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
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info->chip, info->chip_data);
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}
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static void platform_msi_set_proxy_dev(msi_alloc_info_t *arg)
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{
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arg->flags |= MSI_ALLOC_FLAGS_PROXY_DEVICE;
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}
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#else
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#define platform_msi_set_desc NULL
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#define platform_msi_init NULL
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#define platform_msi_set_proxy_dev(x) do {} while(0)
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#endif
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static void platform_msi_update_dom_ops(struct msi_domain_info *info)
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{
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struct msi_domain_ops *ops = info->ops;
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BUG_ON(!ops);
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if (ops->msi_init == NULL)
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ops->msi_init = platform_msi_init;
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if (ops->set_desc == NULL)
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ops->set_desc = platform_msi_set_desc;
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}
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static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
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{
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struct msi_desc *desc = irq_data_get_msi_desc(data);
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desc->dev->msi.data->platform_data->write_msg(desc, msg);
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}
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static void platform_msi_update_chip_ops(struct msi_domain_info *info)
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{
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struct irq_chip *chip = info->chip;
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BUG_ON(!chip);
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if (!chip->irq_mask)
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chip->irq_mask = irq_chip_mask_parent;
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if (!chip->irq_unmask)
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chip->irq_unmask = irq_chip_unmask_parent;
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if (!chip->irq_eoi)
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chip->irq_eoi = irq_chip_eoi_parent;
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if (!chip->irq_set_affinity)
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chip->irq_set_affinity = msi_domain_set_affinity;
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if (!chip->irq_write_msi_msg)
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chip->irq_write_msi_msg = platform_msi_write_msg;
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if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE) &&
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!(chip->flags & IRQCHIP_SUPPORTS_LEVEL_MSI)))
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info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
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}
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/**
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* platform_msi_create_irq_domain - Create a platform MSI interrupt domain
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* @fwnode: Optional fwnode of the interrupt controller
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* @info: MSI domain info
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* @parent: Parent irq domain
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*
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* Updates the domain and chip ops and creates a platform MSI
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* interrupt domain.
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*
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* Returns:
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* A domain pointer or NULL in case of failure.
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*/
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struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
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struct msi_domain_info *info,
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struct irq_domain *parent)
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{
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struct irq_domain *domain;
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if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
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platform_msi_update_dom_ops(info);
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if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
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platform_msi_update_chip_ops(info);
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info->flags |= MSI_FLAG_DEV_SYSFS | MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS |
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MSI_FLAG_FREE_MSI_DESCS;
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domain = msi_create_irq_domain(fwnode, info, parent);
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if (domain)
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irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI);
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return domain;
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}
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EXPORT_SYMBOL_GPL(platform_msi_create_irq_domain);
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static int platform_msi_alloc_priv_data(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 platform_msi_priv_data *datap;
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int err;
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/*
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* Limit the number of interrupts to 2048 per device. Should we
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* need to bump this up, DEV_ID_SHIFT should be adjusted
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* accordingly (which would impact the max number of MSI
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* capable devices).
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*/
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if (!dev->msi.domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS)
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return -EINVAL;
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if (dev->msi.domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) {
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dev_err(dev, "Incompatible msi_domain, giving up\n");
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return -EINVAL;
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}
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err = msi_setup_device_data(dev);
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if (err)
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return err;
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/* Already initialized? */
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if (dev->msi.data->platform_data)
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return -EBUSY;
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datap = kzalloc(sizeof(*datap), GFP_KERNEL);
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if (!datap)
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return -ENOMEM;
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datap->devid = ida_simple_get(&platform_msi_devid_ida,
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0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
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if (datap->devid < 0) {
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err = datap->devid;
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kfree(datap);
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return err;
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}
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datap->write_msg = write_msi_msg;
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datap->dev = dev;
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dev->msi.data->platform_data = datap;
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return 0;
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}
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static void platform_msi_free_priv_data(struct device *dev)
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{
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struct platform_msi_priv_data *data = dev->msi.data->platform_data;
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dev->msi.data->platform_data = NULL;
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ida_simple_remove(&platform_msi_devid_ida, data->devid);
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kfree(data);
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}
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/**
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* platform_msi_domain_alloc_irqs - Allocate MSI 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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int platform_msi_domain_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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int err;
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err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
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if (err)
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return err;
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err = msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1);
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if (err)
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platform_msi_free_priv_data(dev);
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return err;
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}
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EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
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/**
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* platform_msi_domain_free_irqs - Free MSI 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_msi_domain_free_irqs(struct device *dev)
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{
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msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
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platform_msi_free_priv_data(dev);
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}
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EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs);
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/**
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* platform_msi_get_host_data - Query the private data associated with
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* a platform-msi domain
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* @domain: The platform-msi domain
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*
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* Return: The private data provided when calling
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* platform_msi_create_device_domain().
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*/
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void *platform_msi_get_host_data(struct irq_domain *domain)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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return data->host_data;
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}
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static struct lock_class_key platform_device_msi_lock_class;
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/**
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* __platform_msi_create_device_domain - Create a platform-msi device domain
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*
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* @dev: The device generating the MSIs
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* @nvec: The number of MSIs that need to be allocated
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* @is_tree: flag to indicate tree hierarchy
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* @write_msi_msg: Callback to write an interrupt message for @dev
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* @ops: The hierarchy domain operations to use
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* @host_data: Private data associated to this domain
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*
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* Return: An irqdomain for @nvec interrupts on success, NULL in case of error.
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*
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* This is for interrupt domains which stack on a platform-msi domain
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* created by platform_msi_create_irq_domain(). @dev->msi.domain points to
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* that platform-msi domain which is the parent for the new domain.
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*/
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struct irq_domain *
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__platform_msi_create_device_domain(struct device *dev,
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unsigned int nvec,
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bool is_tree,
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irq_write_msi_msg_t write_msi_msg,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct platform_msi_priv_data *data;
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struct irq_domain *domain;
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int err;
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err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
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if (err)
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return NULL;
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/*
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* Use a separate lock class for the MSI descriptor mutex on
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* platform MSI device domains because the descriptor mutex nests
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* into the domain mutex. See alloc/free below.
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*/
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lockdep_set_class(&dev->msi.data->mutex, &platform_device_msi_lock_class);
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data = dev->msi.data->platform_data;
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data->host_data = host_data;
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domain = irq_domain_create_hierarchy(dev->msi.domain, 0,
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is_tree ? 0 : nvec,
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dev->fwnode, ops, data);
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if (!domain)
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goto free_priv;
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platform_msi_set_proxy_dev(&data->arg);
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err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg);
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if (err)
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goto free_domain;
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return domain;
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free_domain:
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irq_domain_remove(domain);
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free_priv:
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platform_msi_free_priv_data(dev);
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return NULL;
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}
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/**
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* platform_msi_device_domain_free - Free interrupts associated with a platform-msi
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* device domain
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*
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* @domain: The platform-msi device domain
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* @virq: The base irq from which to perform the free operation
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* @nr_irqs: How many interrupts to free from @virq
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*/
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void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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msi_lock_descs(data->dev);
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irq_domain_free_irqs_common(domain, virq, nr_irqs);
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msi_free_msi_descs_range(data->dev, virq, virq + nr_irqs - 1);
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msi_unlock_descs(data->dev);
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}
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/**
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* platform_msi_device_domain_alloc - Allocate interrupts associated with
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* a platform-msi device domain
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*
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* @domain: The platform-msi device domain
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* @virq: The base irq from which to perform the allocate operation
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* @nr_irqs: How many interrupts to allocate from @virq
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*
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* Return 0 on success, or an error code on failure. Must be called
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* with irq_domain_mutex held (which can only be done as part of a
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* top-level interrupt allocation).
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*/
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int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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struct device *dev = data->dev;
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return msi_domain_populate_irqs(domain->parent, dev, virq, nr_irqs, &data->arg);
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}
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