Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Marc Zyngier | 1499 | 97.46% | 9 | 50.00% |
Miquel Raynal | 19 | 1.24% | 1 | 5.56% |
Thomas Petazzoni | 10 | 0.65% | 1 | 5.56% |
Thomas Gleixner | 4 | 0.26% | 1 | 5.56% |
Greg Kroah-Hartman | 2 | 0.13% | 2 | 11.11% |
Shaokun Zhang | 1 | 0.07% | 1 | 5.56% |
Ma Jun | 1 | 0.07% | 1 | 5.56% |
Hanjun Guo | 1 | 0.07% | 1 | 5.56% |
Matthias Brugger | 1 | 0.07% | 1 | 5.56% |
Total | 1538 | 18 |
// 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> */ #include <linux/device.h> #include <linux/idr.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/msi.h> #include <linux/slab.h> #define DEV_ID_SHIFT 21 #define MAX_DEV_MSIS (1 << (32 - DEV_ID_SHIFT)) /* * Internal data structure containing a (made up, but unique) devid * and the callback to write the MSI message. */ struct platform_msi_priv_data { struct device *dev; void *host_data; msi_alloc_info_t arg; irq_write_msi_msg_t write_msg; int devid; }; /* The devid allocator */ static DEFINE_IDA(platform_msi_devid_ida); #ifdef GENERIC_MSI_DOMAIN_OPS /* * Convert an msi_desc to a globaly unique identifier (per-device * devid + msi_desc position in the msi_list). */ static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc) { u32 devid; devid = desc->platform.msi_priv_data->devid; return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index; } static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { arg->desc = desc; arg->hwirq = platform_msi_calc_hwirq(desc); } static int platform_msi_init(struct irq_domain *domain, struct msi_domain_info *info, unsigned int virq, irq_hw_number_t hwirq, msi_alloc_info_t *arg) { return irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, info->chip_data); } #else #define platform_msi_set_desc NULL #define platform_msi_init NULL #endif static void platform_msi_update_dom_ops(struct msi_domain_info *info) { struct msi_domain_ops *ops = info->ops; BUG_ON(!ops); if (ops->msi_init == NULL) ops->msi_init = platform_msi_init; if (ops->set_desc == NULL) ops->set_desc = platform_msi_set_desc; } static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg) { struct msi_desc *desc = irq_data_get_msi_desc(data); struct platform_msi_priv_data *priv_data; priv_data = desc->platform.msi_priv_data; priv_data->write_msg(desc, msg); } static void platform_msi_update_chip_ops(struct msi_domain_info *info) { struct irq_chip *chip = info->chip; BUG_ON(!chip); if (!chip->irq_mask) chip->irq_mask = irq_chip_mask_parent; if (!chip->irq_unmask) chip->irq_unmask = irq_chip_unmask_parent; if (!chip->irq_eoi) chip->irq_eoi = irq_chip_eoi_parent; if (!chip->irq_set_affinity) chip->irq_set_affinity = msi_domain_set_affinity; if (!chip->irq_write_msi_msg) chip->irq_write_msi_msg = platform_msi_write_msg; if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE) && !(chip->flags & IRQCHIP_SUPPORTS_LEVEL_MSI))) info->flags &= ~MSI_FLAG_LEVEL_CAPABLE; } static void platform_msi_free_descs(struct device *dev, int base, int nvec) { struct msi_desc *desc, *tmp; list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) { if (desc->platform.msi_index >= base && desc->platform.msi_index < (base + nvec)) { list_del(&desc->list); free_msi_entry(desc); } } } static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq, int nvec, struct platform_msi_priv_data *data) { struct msi_desc *desc; int i, base = 0; if (!list_empty(dev_to_msi_list(dev))) { desc = list_last_entry(dev_to_msi_list(dev), struct msi_desc, list); base = desc->platform.msi_index + 1; } for (i = 0; i < nvec; i++) { desc = alloc_msi_entry(dev, 1, NULL); if (!desc) break; desc->platform.msi_priv_data = data; desc->platform.msi_index = base + i; desc->irq = virq ? virq + i : 0; list_add_tail(&desc->list, dev_to_msi_list(dev)); } if (i != nvec) { /* Clean up the mess */ platform_msi_free_descs(dev, base, nvec); return -ENOMEM; } return 0; } static int platform_msi_alloc_descs(struct device *dev, int nvec, struct platform_msi_priv_data *data) { return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data); } /** * platform_msi_create_irq_domain - Create a platform MSI interrupt domain * @fwnode: Optional fwnode of the interrupt controller * @info: MSI domain info * @parent: Parent irq domain * * Updates the domain and chip ops and creates a platform MSI * interrupt domain. * * Returns: * A domain pointer or NULL in case of failure. */ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode, struct msi_domain_info *info, struct irq_domain *parent) { struct irq_domain *domain; if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS) platform_msi_update_dom_ops(info); if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) platform_msi_update_chip_ops(info); domain = msi_create_irq_domain(fwnode, info, parent); if (domain) irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI); return domain; } static struct platform_msi_priv_data * platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg) { struct platform_msi_priv_data *datap; /* * Limit the number of interrupts to 2048 per device. Should we * need to bump this up, DEV_ID_SHIFT should be adjusted * accordingly (which would impact the max number of MSI * capable devices). */ if (!dev->msi_domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS) return ERR_PTR(-EINVAL); if (dev->msi_domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) { dev_err(dev, "Incompatible msi_domain, giving up\n"); return ERR_PTR(-EINVAL); } /* Already had a helping of MSI? Greed... */ if (!list_empty(dev_to_msi_list(dev))) return ERR_PTR(-EBUSY); datap = kzalloc(sizeof(*datap), GFP_KERNEL); if (!datap) return ERR_PTR(-ENOMEM); datap->devid = ida_simple_get(&platform_msi_devid_ida, 0, 1 << DEV_ID_SHIFT, GFP_KERNEL); if (datap->devid < 0) { int err = datap->devid; kfree(datap); return ERR_PTR(err); } datap->write_msg = write_msi_msg; datap->dev = dev; return datap; } static void platform_msi_free_priv_data(struct platform_msi_priv_data *data) { ida_simple_remove(&platform_msi_devid_ida, data->devid); kfree(data); } /** * platform_msi_domain_alloc_irqs - Allocate MSI 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 */ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg) { struct platform_msi_priv_data *priv_data; int err; priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg); if (IS_ERR(priv_data)) return PTR_ERR(priv_data); err = platform_msi_alloc_descs(dev, nvec, priv_data); if (err) goto out_free_priv_data; err = msi_domain_alloc_irqs(dev->msi_domain, dev, nvec); if (err) goto out_free_desc; return 0; out_free_desc: platform_msi_free_descs(dev, 0, nvec); out_free_priv_data: platform_msi_free_priv_data(priv_data); return err; } EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs); /** * platform_msi_domain_free_irqs - Free MSI interrupts for @dev * @dev: The device for which to free interrupts */ void platform_msi_domain_free_irqs(struct device *dev) { if (!list_empty(dev_to_msi_list(dev))) { struct msi_desc *desc; desc = first_msi_entry(dev); platform_msi_free_priv_data(desc->platform.msi_priv_data); } msi_domain_free_irqs(dev->msi_domain, dev); platform_msi_free_descs(dev, 0, MAX_DEV_MSIS); } EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs); /** * platform_msi_get_host_data - Query the private data associated with * a platform-msi domain * @domain: The platform-msi domain * * Returns the private data provided when calling * platform_msi_create_device_domain. */ void *platform_msi_get_host_data(struct irq_domain *domain) { struct platform_msi_priv_data *data = domain->host_data; return data->host_data; } /** * platform_msi_create_device_domain - Create a platform-msi domain * * @dev: The device generating the MSIs * @nvec: The number of MSIs that need to be allocated * @write_msi_msg: Callback to write an interrupt message for @dev * @ops: The hierarchy domain operations to use * @host_data: Private data associated to this domain * * Returns an irqdomain for @nvec interrupts */ struct irq_domain * __platform_msi_create_device_domain(struct device *dev, unsigned int nvec, bool is_tree, irq_write_msi_msg_t write_msi_msg, const struct irq_domain_ops *ops, void *host_data) { struct platform_msi_priv_data *data; struct irq_domain *domain; int err; data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg); if (IS_ERR(data)) return NULL; data->host_data = host_data; domain = irq_domain_create_hierarchy(dev->msi_domain, 0, is_tree ? 0 : nvec, dev->fwnode, ops, data); if (!domain) goto free_priv; err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg); if (err) goto free_domain; return domain; free_domain: irq_domain_remove(domain); free_priv: platform_msi_free_priv_data(data); return NULL; } /** * platform_msi_domain_free - Free interrupts associated with a platform-msi * domain * * @domain: The platform-msi domain * @virq: The base irq from which to perform the free operation * @nvec: How many interrupts to free from @virq */ void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq, unsigned int nvec) { struct platform_msi_priv_data *data = domain->host_data; struct msi_desc *desc, *tmp; for_each_msi_entry_safe(desc, tmp, data->dev) { if (WARN_ON(!desc->irq || desc->nvec_used != 1)) return; if (!(desc->irq >= virq && desc->irq < (virq + nvec))) continue; irq_domain_free_irqs_common(domain, desc->irq, 1); list_del(&desc->list); free_msi_entry(desc); } } /** * platform_msi_domain_alloc - Allocate interrupts associated with * a platform-msi domain * * @domain: The platform-msi domain * @virq: The base irq from which to perform the allocate operation * @nr_irqs: How many interrupts to free from @virq * * Return 0 on success, or an error code on failure. Must be called * with irq_domain_mutex held (which can only be done as part of a * top-level interrupt allocation). */ int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct platform_msi_priv_data *data = domain->host_data; int err; err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data); if (err) return err; err = msi_domain_populate_irqs(domain->parent, data->dev, virq, nr_irqs, &data->arg); if (err) platform_msi_domain_free(domain, virq, nr_irqs); return err; }
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