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350 lines
9.7 KiB
350 lines
9.7 KiB
// 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 <[email protected]> |
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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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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(dev->msi.domain, dev, nvec); |
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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(dev->msi.domain, dev); |
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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, MSI_DESC_ALL, 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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