Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Marc Zyngier | 998 | 82.55% | 10 | 40.00% |
Thomas Gleixner | 184 | 15.22% | 7 | 28.00% |
Thomas Petazzoni | 10 | 0.83% | 1 | 4.00% |
Miquel Raynal | 7 | 0.58% | 1 | 4.00% |
Frank Li | 5 | 0.41% | 1 | 4.00% |
Greg Kroah-Hartman | 2 | 0.17% | 2 | 8.00% |
Ma Jun | 1 | 0.08% | 1 | 4.00% |
Hanjun Guo | 1 | 0.08% | 1 | 4.00% |
Matthias Brugger | 1 | 0.08% | 1 | 4.00% |
Total | 1209 | 25 |
// 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 = desc->dev->msi.data->platform_data->devid; return (devid << (32 - DEV_ID_SHIFT)) | desc->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); } static void platform_msi_set_proxy_dev(msi_alloc_info_t *arg) { arg->flags |= MSI_ALLOC_FLAGS_PROXY_DEVICE; } #else #define platform_msi_set_desc NULL #define platform_msi_init NULL #define platform_msi_set_proxy_dev(x) do {} while(0) #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); desc->dev->msi.data->platform_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; } /** * 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); info->flags |= MSI_FLAG_DEV_SYSFS | MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS; domain = msi_create_irq_domain(fwnode, info, parent); if (domain) irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI); return domain; } EXPORT_SYMBOL_GPL(platform_msi_create_irq_domain); static int 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; int err; /* * 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 -EINVAL; if (dev->msi.domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) { dev_err(dev, "Incompatible msi_domain, giving up\n"); return -EINVAL; } err = msi_setup_device_data(dev); if (err) return err; /* Already initialized? */ if (dev->msi.data->platform_data) return -EBUSY; datap = kzalloc(sizeof(*datap), GFP_KERNEL); if (!datap) return -ENOMEM; datap->devid = ida_simple_get(&platform_msi_devid_ida, 0, 1 << DEV_ID_SHIFT, GFP_KERNEL); if (datap->devid < 0) { err = datap->devid; kfree(datap); return err; } datap->write_msg = write_msi_msg; datap->dev = dev; dev->msi.data->platform_data = datap; return 0; } static void platform_msi_free_priv_data(struct device *dev) { struct platform_msi_priv_data *data = dev->msi.data->platform_data; dev->msi.data->platform_data = NULL; 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) { int err; err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg); if (err) return err; err = msi_domain_alloc_irqs(dev->msi.domain, dev, nvec); if (err) platform_msi_free_priv_data(dev); 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) { msi_domain_free_irqs(dev->msi.domain, dev); platform_msi_free_priv_data(dev); } 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 * * Return: 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; } static struct lock_class_key platform_device_msi_lock_class; /** * __platform_msi_create_device_domain - Create a platform-msi device domain * * @dev: The device generating the MSIs * @nvec: The number of MSIs that need to be allocated * @is_tree: flag to indicate tree hierarchy * @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 * * Return: An irqdomain for @nvec interrupts on success, NULL in case of error. * * This is for interrupt domains which stack on a platform-msi domain * created by platform_msi_create_irq_domain(). @dev->msi.domain points to * that platform-msi domain which is the parent for the new domain. */ 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; err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg); if (err) return NULL; /* * Use a separate lock class for the MSI descriptor mutex on * platform MSI device domains because the descriptor mutex nests * into the domain mutex. See alloc/free below. */ lockdep_set_class(&dev->msi.data->mutex, &platform_device_msi_lock_class); data = dev->msi.data->platform_data; 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; platform_msi_set_proxy_dev(&data->arg); 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(dev); return NULL; } /** * platform_msi_device_domain_free - Free interrupts associated with a platform-msi * device domain * * @domain: The platform-msi device domain * @virq: The base irq from which to perform the free operation * @nr_irqs: How many interrupts to free from @virq */ void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct platform_msi_priv_data *data = domain->host_data; msi_lock_descs(data->dev); irq_domain_free_irqs_common(domain, virq, nr_irqs); msi_free_msi_descs_range(data->dev, MSI_DESC_ALL, virq, virq + nr_irqs - 1); msi_unlock_descs(data->dev); } /** * platform_msi_device_domain_alloc - Allocate interrupts associated with * a platform-msi device domain * * @domain: The platform-msi device domain * @virq: The base irq from which to perform the allocate operation * @nr_irqs: How many interrupts to allocate 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_device_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct platform_msi_priv_data *data = domain->host_data; struct device *dev = data->dev; return msi_domain_populate_irqs(domain->parent, dev, virq, nr_irqs, &data->arg); }
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