| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Thomas Gleixner | 4720 | 68.94% | 68 | 56.67% |
| Jiang Liu | 1395 | 20.37% | 8 | 6.67% |
| Marc Zyngier | 331 | 4.83% | 14 | 11.67% |
| Barry Song | 150 | 2.19% | 1 | 0.83% |
| Jason Gunthorpe | 78 | 1.14% | 4 | 3.33% |
| Ahmed S. Darwish | 44 | 0.64% | 2 | 1.67% |
| Bixuan Cui | 24 | 0.35% | 1 | 0.83% |
| Eric W. Biedermann | 23 | 0.34% | 3 | 2.50% |
| Grant C. Likely | 13 | 0.19% | 1 | 0.83% |
| Maximilian Heyne | 11 | 0.16% | 1 | 0.83% |
| Neil Horman | 9 | 0.13% | 1 | 0.83% |
| Gavin Shan | 8 | 0.12% | 1 | 0.83% |
| Dan J Williams | 6 | 0.09% | 1 | 0.83% |
| Konrad Rzeszutek Wilk | 6 | 0.09% | 1 | 0.83% |
| Andrew Morton | 5 | 0.07% | 1 | 0.83% |
| Michael Ellerman | 4 | 0.06% | 1 | 0.83% |
| Greg Kroah-Hartman | 4 | 0.06% | 1 | 0.83% |
| Ingo Molnar | 4 | 0.06% | 2 | 1.67% |
| Linus Torvalds (pre-git) | 3 | 0.04% | 2 | 1.67% |
| Matthew Wilcox | 2 | 0.03% | 1 | 0.83% |
| Dou Liyang | 2 | 0.03% | 1 | 0.83% |
| Randy Dunlap | 2 | 0.03% | 1 | 0.83% |
| Pekka J Enberg | 1 | 0.01% | 1 | 0.83% |
| Krzysztof Kozlowski | 1 | 0.01% | 1 | 0.83% |
| Eric Auger | 1 | 0.01% | 1 | 0.83% |
| Total | 6847 | 120 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2014 Intel Corp. * Author: Jiang Liu <jiang.liu@linux.intel.com> * * This file is licensed under GPLv2. * * This file contains common code to support Message Signaled Interrupts for * PCI compatible and non PCI compatible devices. */ #include <linux/types.h> #include <linux/device.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/msi.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/pci.h> #include "internals.h" /** * struct msi_ctrl - MSI internal management control structure * @domid: ID of the domain on which management operations should be done * @first: First (hardware) slot index to operate on * @last: Last (hardware) slot index to operate on * @nirqs: The number of Linux interrupts to allocate. Can be larger * than the range due to PCI/multi-MSI. */ struct msi_ctrl { unsigned int domid; unsigned int first; unsigned int last; unsigned int nirqs; }; /* Invalid Xarray index which is outside of any searchable range */ #define MSI_XA_MAX_INDEX (ULONG_MAX - 1) /* The maximum domain size */ #define MSI_XA_DOMAIN_SIZE (MSI_MAX_INDEX + 1) static void msi_domain_free_locked(struct device *dev, struct msi_ctrl *ctrl); static unsigned int msi_domain_get_hwsize(struct device *dev, unsigned int domid); static inline int msi_sysfs_create_group(struct device *dev); /** * msi_alloc_desc - Allocate an initialized msi_desc * @dev: Pointer to the device for which this is allocated * @nvec: The number of vectors used in this entry * @affinity: Optional pointer to an affinity mask array size of @nvec * * If @affinity is not %NULL then an affinity array[@nvec] is allocated * and the affinity masks and flags from @affinity are copied. * * Return: pointer to allocated &msi_desc on success or %NULL on failure */ static struct msi_desc *msi_alloc_desc(struct device *dev, int nvec, const struct irq_affinity_desc *affinity) { struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL); if (!desc) return NULL; desc->dev = dev; desc->nvec_used = nvec; if (affinity) { desc->affinity = kmemdup(affinity, nvec * sizeof(*desc->affinity), GFP_KERNEL); if (!desc->affinity) { kfree(desc); return NULL; } } return desc; } static void msi_free_desc(struct msi_desc *desc) { kfree(desc->affinity); kfree(desc); } static int msi_insert_desc(struct device *dev, struct msi_desc *desc, unsigned int domid, unsigned int index) { struct msi_device_data *md = dev->msi.data; struct xarray *xa = &md->__domains[domid].store; unsigned int hwsize; int ret; hwsize = msi_domain_get_hwsize(dev, domid); if (index == MSI_ANY_INDEX) { struct xa_limit limit = { .min = 0, .max = hwsize - 1 }; unsigned int index; /* Let the xarray allocate a free index within the limit */ ret = xa_alloc(xa, &index, desc, limit, GFP_KERNEL); if (ret) goto fail; desc->msi_index = index; return 0; } else { if (index >= hwsize) { ret = -ERANGE; goto fail; } desc->msi_index = index; ret = xa_insert(xa, index, desc, GFP_KERNEL); if (ret) goto fail; return 0; } fail: msi_free_desc(desc); return ret; } /** * msi_domain_insert_msi_desc - Allocate and initialize a MSI descriptor and * insert it at @init_desc->msi_index * * @dev: Pointer to the device for which the descriptor is allocated * @domid: The id of the interrupt domain to which the desriptor is added * @init_desc: Pointer to an MSI descriptor to initialize the new descriptor * * Return: 0 on success or an appropriate failure code. */ int msi_domain_insert_msi_desc(struct device *dev, unsigned int domid, struct msi_desc *init_desc) { struct msi_desc *desc; lockdep_assert_held(&dev->msi.data->mutex); desc = msi_alloc_desc(dev, init_desc->nvec_used, init_desc->affinity); if (!desc) return -ENOMEM; /* Copy type specific data to the new descriptor. */ desc->pci = init_desc->pci; return msi_insert_desc(dev, desc, domid, init_desc->msi_index); } static bool msi_desc_match(struct msi_desc *desc, enum msi_desc_filter filter) { switch (filter) { case MSI_DESC_ALL: return true; case MSI_DESC_NOTASSOCIATED: return !desc->irq; case MSI_DESC_ASSOCIATED: return !!desc->irq; } WARN_ON_ONCE(1); return false; } static bool msi_ctrl_valid(struct device *dev, struct msi_ctrl *ctrl) { unsigned int hwsize; if (WARN_ON_ONCE(ctrl->domid >= MSI_MAX_DEVICE_IRQDOMAINS || (dev->msi.domain && !dev->msi.data->__domains[ctrl->domid].domain))) return false; hwsize = msi_domain_get_hwsize(dev, ctrl->domid); if (WARN_ON_ONCE(ctrl->first > ctrl->last || ctrl->first >= hwsize || ctrl->last >= hwsize)) return false; return true; } static void msi_domain_free_descs(struct device *dev, struct msi_ctrl *ctrl) { struct msi_desc *desc; struct xarray *xa; unsigned long idx; lockdep_assert_held(&dev->msi.data->mutex); if (!msi_ctrl_valid(dev, ctrl)) return; xa = &dev->msi.data->__domains[ctrl->domid].store; xa_for_each_range(xa, idx, desc, ctrl->first, ctrl->last) { xa_erase(xa, idx); /* Leak the descriptor when it is still referenced */ if (WARN_ON_ONCE(msi_desc_match(desc, MSI_DESC_ASSOCIATED))) continue; msi_free_desc(desc); } } /** * msi_domain_free_msi_descs_range - Free a range of MSI descriptors of a device in an irqdomain * @dev: Device for which to free the descriptors * @domid: Id of the domain to operate on * @first: Index to start freeing from (inclusive) * @last: Last index to be freed (inclusive) */ void msi_domain_free_msi_descs_range(struct device *dev, unsigned int domid, unsigned int first, unsigned int last) { struct msi_ctrl ctrl = { .domid = domid, .first = first, .last = last, }; msi_domain_free_descs(dev, &ctrl); } /** * msi_domain_add_simple_msi_descs - Allocate and initialize MSI descriptors * @dev: Pointer to the device for which the descriptors are allocated * @ctrl: Allocation control struct * * Return: 0 on success or an appropriate failure code. */ static int msi_domain_add_simple_msi_descs(struct device *dev, struct msi_ctrl *ctrl) { struct msi_desc *desc; unsigned int idx; int ret; lockdep_assert_held(&dev->msi.data->mutex); if (!msi_ctrl_valid(dev, ctrl)) return -EINVAL; for (idx = ctrl->first; idx <= ctrl->last; idx++) { desc = msi_alloc_desc(dev, 1, NULL); if (!desc) goto fail_mem; ret = msi_insert_desc(dev, desc, ctrl->domid, idx); if (ret) goto fail; } return 0; fail_mem: ret = -ENOMEM; fail: msi_domain_free_descs(dev, ctrl); return ret; } void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg) { *msg = entry->msg; } void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) { struct msi_desc *entry = irq_get_msi_desc(irq); __get_cached_msi_msg(entry, msg); } EXPORT_SYMBOL_GPL(get_cached_msi_msg); static void msi_device_data_release(struct device *dev, void *res) { struct msi_device_data *md = res; int i; for (i = 0; i < MSI_MAX_DEVICE_IRQDOMAINS; i++) { msi_remove_device_irq_domain(dev, i); WARN_ON_ONCE(!xa_empty(&md->__domains[i].store)); xa_destroy(&md->__domains[i].store); } dev->msi.data = NULL; } /** * msi_setup_device_data - Setup MSI device data * @dev: Device for which MSI device data should be set up * * Return: 0 on success, appropriate error code otherwise * * This can be called more than once for @dev. If the MSI device data is * already allocated the call succeeds. The allocated memory is * automatically released when the device is destroyed. */ int msi_setup_device_data(struct device *dev) { struct msi_device_data *md; int ret, i; if (dev->msi.data) return 0; md = devres_alloc(msi_device_data_release, sizeof(*md), GFP_KERNEL); if (!md) return -ENOMEM; ret = msi_sysfs_create_group(dev); if (ret) { devres_free(md); return ret; } for (i = 0; i < MSI_MAX_DEVICE_IRQDOMAINS; i++) xa_init_flags(&md->__domains[i].store, XA_FLAGS_ALLOC); /* * If @dev::msi::domain is set and is a global MSI domain, copy the * pointer into the domain array so all code can operate on domain * ids. The NULL pointer check is required to keep the legacy * architecture specific PCI/MSI support working. */ if (dev->msi.domain && !irq_domain_is_msi_parent(dev->msi.domain)) md->__domains[MSI_DEFAULT_DOMAIN].domain = dev->msi.domain; mutex_init(&md->mutex); dev->msi.data = md; devres_add(dev, md); return 0; } /** * msi_lock_descs - Lock the MSI descriptor storage of a device * @dev: Device to operate on */ void msi_lock_descs(struct device *dev) { mutex_lock(&dev->msi.data->mutex); } EXPORT_SYMBOL_GPL(msi_lock_descs); /** * msi_unlock_descs - Unlock the MSI descriptor storage of a device * @dev: Device to operate on */ void msi_unlock_descs(struct device *dev) { /* Invalidate the index which was cached by the iterator */ dev->msi.data->__iter_idx = MSI_XA_MAX_INDEX; mutex_unlock(&dev->msi.data->mutex); } EXPORT_SYMBOL_GPL(msi_unlock_descs); static struct msi_desc *msi_find_desc(struct msi_device_data *md, unsigned int domid, enum msi_desc_filter filter) { struct xarray *xa = &md->__domains[domid].store; struct msi_desc *desc; xa_for_each_start(xa, md->__iter_idx, desc, md->__iter_idx) { if (msi_desc_match(desc, filter)) return desc; } md->__iter_idx = MSI_XA_MAX_INDEX; return NULL; } /** * msi_domain_first_desc - Get the first MSI descriptor of an irqdomain associated to a device * @dev: Device to operate on * @domid: The id of the interrupt domain which should be walked. * @filter: Descriptor state filter * * Must be called with the MSI descriptor mutex held, i.e. msi_lock_descs() * must be invoked before the call. * * Return: Pointer to the first MSI descriptor matching the search * criteria, NULL if none found. */ struct msi_desc *msi_domain_first_desc(struct device *dev, unsigned int domid, enum msi_desc_filter filter) { struct msi_device_data *md = dev->msi.data; if (WARN_ON_ONCE(!md || domid >= MSI_MAX_DEVICE_IRQDOMAINS)) return NULL; lockdep_assert_held(&md->mutex); md->__iter_idx = 0; return msi_find_desc(md, domid, filter); } EXPORT_SYMBOL_GPL(msi_domain_first_desc); /** * msi_next_desc - Get the next MSI descriptor of a device * @dev: Device to operate on * @domid: The id of the interrupt domain which should be walked. * @filter: Descriptor state filter * * The first invocation of msi_next_desc() has to be preceeded by a * successful invocation of __msi_first_desc(). Consecutive invocations are * only valid if the previous one was successful. All these operations have * to be done within the same MSI mutex held region. * * Return: Pointer to the next MSI descriptor matching the search * criteria, NULL if none found. */ struct msi_desc *msi_next_desc(struct device *dev, unsigned int domid, enum msi_desc_filter filter) { struct msi_device_data *md = dev->msi.data; if (WARN_ON_ONCE(!md || domid >= MSI_MAX_DEVICE_IRQDOMAINS)) return NULL; lockdep_assert_held(&md->mutex); if (md->__iter_idx >= (unsigned long)MSI_MAX_INDEX) return NULL; md->__iter_idx++; return msi_find_desc(md, domid, filter); } EXPORT_SYMBOL_GPL(msi_next_desc); /** * msi_domain_get_virq - Lookup the Linux interrupt number for a MSI index on a interrupt domain * @dev: Device to operate on * @domid: Domain ID of the interrupt domain associated to the device * @index: MSI interrupt index to look for (0-based) * * Return: The Linux interrupt number on success (> 0), 0 if not found */ unsigned int msi_domain_get_virq(struct device *dev, unsigned int domid, unsigned int index) { struct msi_desc *desc; unsigned int ret = 0; bool pcimsi = false; struct xarray *xa; if (!dev->msi.data) return 0; if (WARN_ON_ONCE(index > MSI_MAX_INDEX || domid >= MSI_MAX_DEVICE_IRQDOMAINS)) return 0; /* This check is only valid for the PCI default MSI domain */ if (dev_is_pci(dev) && domid == MSI_DEFAULT_DOMAIN) pcimsi = to_pci_dev(dev)->msi_enabled; msi_lock_descs(dev); xa = &dev->msi.data->__domains[domid].store; desc = xa_load(xa, pcimsi ? 0 : index); if (desc && desc->irq) { /* * PCI-MSI has only one descriptor for multiple interrupts. * PCI-MSIX and platform MSI use a descriptor per * interrupt. */ if (pcimsi) { if (index < desc->nvec_used) ret = desc->irq + index; } else { ret = desc->irq; } } msi_unlock_descs(dev); return ret; } EXPORT_SYMBOL_GPL(msi_domain_get_virq); #ifdef CONFIG_SYSFS static struct attribute *msi_dev_attrs[] = { NULL }; static const struct attribute_group msi_irqs_group = { .name = "msi_irqs", .attrs = msi_dev_attrs, }; static inline int msi_sysfs_create_group(struct device *dev) { return devm_device_add_group(dev, &msi_irqs_group); } static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { /* MSI vs. MSIX is per device not per interrupt */ bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false; return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi"); } static void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc) { struct device_attribute *attrs = desc->sysfs_attrs; int i; if (!attrs) return; desc->sysfs_attrs = NULL; for (i = 0; i < desc->nvec_used; i++) { if (attrs[i].show) sysfs_remove_file_from_group(&dev->kobj, &attrs[i].attr, msi_irqs_group.name); kfree(attrs[i].attr.name); } kfree(attrs); } static int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *desc) { struct device_attribute *attrs; int ret, i; attrs = kcalloc(desc->nvec_used, sizeof(*attrs), GFP_KERNEL); if (!attrs) return -ENOMEM; desc->sysfs_attrs = attrs; for (i = 0; i < desc->nvec_used; i++) { sysfs_attr_init(&attrs[i].attr); attrs[i].attr.name = kasprintf(GFP_KERNEL, "%d", desc->irq + i); if (!attrs[i].attr.name) { ret = -ENOMEM; goto fail; } attrs[i].attr.mode = 0444; attrs[i].show = msi_mode_show; ret = sysfs_add_file_to_group(&dev->kobj, &attrs[i].attr, msi_irqs_group.name); if (ret) { attrs[i].show = NULL; goto fail; } } return 0; fail: msi_sysfs_remove_desc(dev, desc); return ret; } #if defined(CONFIG_PCI_MSI_ARCH_FALLBACKS) || defined(CONFIG_PCI_XEN) /** * msi_device_populate_sysfs - Populate msi_irqs sysfs entries for a device * @dev: The device (PCI, platform etc) which will get sysfs entries */ int msi_device_populate_sysfs(struct device *dev) { struct msi_desc *desc; int ret; msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) { if (desc->sysfs_attrs) continue; ret = msi_sysfs_populate_desc(dev, desc); if (ret) return ret; } return 0; } /** * msi_device_destroy_sysfs - Destroy msi_irqs sysfs entries for a device * @dev: The device (PCI, platform etc) for which to remove * sysfs entries */ void msi_device_destroy_sysfs(struct device *dev) { struct msi_desc *desc; msi_for_each_desc(desc, dev, MSI_DESC_ALL) msi_sysfs_remove_desc(dev, desc); } #endif /* CONFIG_PCI_MSI_ARCH_FALLBACK || CONFIG_PCI_XEN */ #else /* CONFIG_SYSFS */ static inline int msi_sysfs_create_group(struct device *dev) { return 0; } static inline int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *desc) { return 0; } static inline void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc) { } #endif /* !CONFIG_SYSFS */ static struct irq_domain *msi_get_device_domain(struct device *dev, unsigned int domid) { struct irq_domain *domain; lockdep_assert_held(&dev->msi.data->mutex); if (WARN_ON_ONCE(domid >= MSI_MAX_DEVICE_IRQDOMAINS)) return NULL; domain = dev->msi.data->__domains[domid].domain; if (!domain) return NULL; if (WARN_ON_ONCE(irq_domain_is_msi_parent(domain))) return NULL; return domain; } static unsigned int msi_domain_get_hwsize(struct device *dev, unsigned int domid) { struct msi_domain_info *info; struct irq_domain *domain; domain = msi_get_device_domain(dev, domid); if (domain) { info = domain->host_data; return info->hwsize; } /* No domain, default to MSI_XA_DOMAIN_SIZE */ return MSI_XA_DOMAIN_SIZE; } static inline void irq_chip_write_msi_msg(struct irq_data *data, struct msi_msg *msg) { data->chip->irq_write_msi_msg(data, msg); } static void msi_check_level(struct irq_domain *domain, struct msi_msg *msg) { struct msi_domain_info *info = domain->host_data; /* * If the MSI provider has messed with the second message and * not advertized that it is level-capable, signal the breakage. */ WARN_ON(!((info->flags & MSI_FLAG_LEVEL_CAPABLE) && (info->chip->flags & IRQCHIP_SUPPORTS_LEVEL_MSI)) && (msg[1].address_lo || msg[1].address_hi || msg[1].data)); } /** * msi_domain_set_affinity - Generic affinity setter function for MSI domains * @irq_data: The irq data associated to the interrupt * @mask: The affinity mask to set * @force: Flag to enforce setting (disable online checks) * * Intended to be used by MSI interrupt controllers which are * implemented with hierarchical domains. * * Return: IRQ_SET_MASK_* result code */ int msi_domain_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { struct irq_data *parent = irq_data->parent_data; struct msi_msg msg[2] = { [1] = { }, }; int ret; ret = parent->chip->irq_set_affinity(parent, mask, force); if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { BUG_ON(irq_chip_compose_msi_msg(irq_data, msg)); msi_check_level(irq_data->domain, msg); irq_chip_write_msi_msg(irq_data, msg); } return ret; } static int msi_domain_activate(struct irq_domain *domain, struct irq_data *irq_data, bool early) { struct msi_msg msg[2] = { [1] = { }, }; BUG_ON(irq_chip_compose_msi_msg(irq_data, msg)); msi_check_level(irq_data->domain, msg); irq_chip_write_msi_msg(irq_data, msg); return 0; } static void msi_domain_deactivate(struct irq_domain *domain, struct irq_data *irq_data) { struct msi_msg msg[2]; memset(msg, 0, sizeof(msg)); irq_chip_write_msi_msg(irq_data, msg); } static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) { struct msi_domain_info *info = domain->host_data; struct msi_domain_ops *ops = info->ops; irq_hw_number_t hwirq = ops->get_hwirq(info, arg); int i, ret; if (irq_find_mapping(domain, hwirq) > 0) return -EEXIST; if (domain->parent) { ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); if (ret < 0) return ret; } for (i = 0; i < nr_irqs; i++) { ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg); if (ret < 0) { if (ops->msi_free) { for (i--; i > 0; i--) ops->msi_free(domain, info, virq + i); } irq_domain_free_irqs_top(domain, virq, nr_irqs); return ret; } } return 0; } static void msi_domain_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct msi_domain_info *info = domain->host_data; int i; if (info->ops->msi_free) { for (i = 0; i < nr_irqs; i++) info->ops->msi_free(domain, info, virq + i); } irq_domain_free_irqs_top(domain, virq, nr_irqs); } static int msi_domain_translate(struct irq_domain *domain, struct irq_fwspec *fwspec, irq_hw_number_t *hwirq, unsigned int *type) { struct msi_domain_info *info = domain->host_data; /* * This will catch allocations through the regular irqdomain path except * for MSI domains which really support this, e.g. MBIGEN. */ if (!info->ops->msi_translate) return -ENOTSUPP; return info->ops->msi_translate(domain, fwspec, hwirq, type); } static const struct irq_domain_ops msi_domain_ops = { .alloc = msi_domain_alloc, .free = msi_domain_free, .activate = msi_domain_activate, .deactivate = msi_domain_deactivate, .translate = msi_domain_translate, }; static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info, msi_alloc_info_t *arg) { return arg->hwirq; } static int msi_domain_ops_prepare(struct irq_domain *domain, struct device *dev, int nvec, msi_alloc_info_t *arg) { memset(arg, 0, sizeof(*arg)); return 0; } static void msi_domain_ops_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { arg->desc = desc; } static int msi_domain_ops_init(struct irq_domain *domain, struct msi_domain_info *info, unsigned int virq, irq_hw_number_t hwirq, msi_alloc_info_t *arg) { irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, info->chip_data); if (info->handler && info->handler_name) { __irq_set_handler(virq, info->handler, 0, info->handler_name); if (info->handler_data) irq_set_handler_data(virq, info->handler_data); } return 0; } static struct msi_domain_ops msi_domain_ops_default = { .get_hwirq = msi_domain_ops_get_hwirq, .msi_init = msi_domain_ops_init, .msi_prepare = msi_domain_ops_prepare, .set_desc = msi_domain_ops_set_desc, }; static void msi_domain_update_dom_ops(struct msi_domain_info *info) { struct msi_domain_ops *ops = info->ops; if (ops == NULL) { info->ops = &msi_domain_ops_default; return; } if (!(info->flags & MSI_FLAG_USE_DEF_DOM_OPS)) return; if (ops->get_hwirq == NULL) ops->get_hwirq = msi_domain_ops_default.get_hwirq; if (ops->msi_init == NULL) ops->msi_init = msi_domain_ops_default.msi_init; if (ops->msi_prepare == NULL) ops->msi_prepare = msi_domain_ops_default.msi_prepare; if (ops->set_desc == NULL) ops->set_desc = msi_domain_ops_default.set_desc; } static void msi_domain_update_chip_ops(struct msi_domain_info *info) { struct irq_chip *chip = info->chip; BUG_ON(!chip || !chip->irq_mask || !chip->irq_unmask); if (!chip->irq_set_affinity) chip->irq_set_affinity = msi_domain_set_affinity; } static struct irq_domain *__msi_create_irq_domain(struct fwnode_handle *fwnode, struct msi_domain_info *info, unsigned int flags, struct irq_domain *parent) { struct irq_domain *domain; if (info->hwsize > MSI_XA_DOMAIN_SIZE) return NULL; /* * Hardware size 0 is valid for backwards compatibility and for * domains which are not backed by a hardware table. Grant the * maximum index space. */ if (!info->hwsize) info->hwsize = MSI_XA_DOMAIN_SIZE; msi_domain_update_dom_ops(info); if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) msi_domain_update_chip_ops(info); domain = irq_domain_create_hierarchy(parent, flags | IRQ_DOMAIN_FLAG_MSI, 0, fwnode, &msi_domain_ops, info); if (domain) { irq_domain_update_bus_token(domain, info->bus_token); if (info->flags & MSI_FLAG_PARENT_PM_DEV) domain->pm_dev = parent->pm_dev; } return domain; } /** * msi_create_irq_domain - Create an MSI interrupt domain * @fwnode: Optional fwnode of the interrupt controller * @info: MSI domain info * @parent: Parent irq domain * * Return: pointer to the created &struct irq_domain or %NULL on failure */ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode, struct msi_domain_info *info, struct irq_domain *parent) { return __msi_create_irq_domain(fwnode, info, 0, parent); } /** * msi_parent_init_dev_msi_info - Delegate initialization of device MSI info down * in the domain hierarchy * @dev: The device for which the domain should be created * @domain: The domain in the hierarchy this op is being called on * @msi_parent_domain: The IRQ_DOMAIN_FLAG_MSI_PARENT domain for the child to * be created * @msi_child_info: The MSI domain info of the IRQ_DOMAIN_FLAG_MSI_DEVICE * domain to be created * * Return: true on success, false otherwise * * This is the most complex problem of per device MSI domains and the * underlying interrupt domain hierarchy: * * The device domain to be initialized requests the broadest feature set * possible and the underlying domain hierarchy puts restrictions on it. * * That's trivial for a simple parent->child relationship, but it gets * interesting with an intermediate domain: root->parent->child. The * intermediate 'parent' can expand the capabilities which the 'root' * domain is providing. So that creates a classic hen and egg problem: * Which entity is doing the restrictions/expansions? * * One solution is to let the root domain handle the initialization that's * why there is the @domain and the @msi_parent_domain pointer. */ bool msi_parent_init_dev_msi_info(struct device *dev, struct irq_domain *domain, struct irq_domain *msi_parent_domain, struct msi_domain_info *msi_child_info) { struct irq_domain *parent = domain->parent; if (WARN_ON_ONCE(!parent || !parent->msi_parent_ops || !parent->msi_parent_ops->init_dev_msi_info)) return false; return parent->msi_parent_ops->init_dev_msi_info(dev, parent, msi_parent_domain, msi_child_info); } /** * msi_create_device_irq_domain - Create a device MSI interrupt domain * @dev: Pointer to the device * @domid: Domain id * @template: MSI domain info bundle used as template * @hwsize: Maximum number of MSI table entries (0 if unknown or unlimited) * @domain_data: Optional pointer to domain specific data which is set in * msi_domain_info::data * @chip_data: Optional pointer to chip specific data which is set in * msi_domain_info::chip_data * * Return: True on success, false otherwise * * There is no firmware node required for this interface because the per * device domains are software constructs which are actually closer to the * hardware reality than any firmware can describe them. * * The domain name and the irq chip name for a MSI device domain are * composed by: "$(PREFIX)$(CHIPNAME)-$(DEVNAME)" * * $PREFIX: Optional prefix provided by the underlying MSI parent domain * via msi_parent_ops::prefix. If that pointer is NULL the prefix * is empty. * $CHIPNAME: The name of the irq_chip in @template * $DEVNAME: The name of the device * * This results in understandable chip names and hardware interrupt numbers * in e.g. /proc/interrupts * * PCI-MSI-0000:00:1c.0 0-edge Parent domain has no prefix * IR-PCI-MSI-0000:00:1c.4 0-edge Same with interrupt remapping prefix 'IR-' * * IR-PCI-MSIX-0000:3d:00.0 0-edge Hardware interrupt numbers reflect * IR-PCI-MSIX-0000:3d:00.0 1-edge the real MSI-X index on that device * IR-PCI-MSIX-0000:3d:00.0 2-edge * * On IMS domains the hardware interrupt number is either a table entry * index or a purely software managed index but it is guaranteed to be * unique. * * The domain pointer is stored in @dev::msi::data::__irqdomains[]. All * subsequent operations on the domain depend on the domain id. * * The domain is automatically freed when the device is removed via devres * in the context of @dev::msi::data freeing, but it can also be * independently removed via @msi_remove_device_irq_domain(). */ bool msi_create_device_irq_domain(struct device *dev, unsigned int domid, const struct msi_domain_template *template, unsigned int hwsize, void *domain_data, void *chip_data) { struct irq_domain *domain, *parent = dev->msi.domain; struct fwnode_handle *fwnode, *fwnalloced = NULL; struct msi_domain_template *bundle; const struct msi_parent_ops *pops; if (!irq_domain_is_msi_parent(parent)) return false; if (domid >= MSI_MAX_DEVICE_IRQDOMAINS) return false; bundle = kmemdup(template, sizeof(*bundle), GFP_KERNEL); if (!bundle) return false; bundle->info.hwsize = hwsize; bundle->info.chip = &bundle->chip; bundle->info.ops = &bundle->ops; bundle->info.data = domain_data; bundle->info.chip_data = chip_data; pops = parent->msi_parent_ops; snprintf(bundle->name, sizeof(bundle->name), "%s%s-%s", pops->prefix ? : "", bundle->chip.name, dev_name(dev)); bundle->chip.name = bundle->name; /* * Using the device firmware node is required for wire to MSI * device domains so that the existing firmware results in a domain * match. * All other device domains like PCI/MSI use the named firmware * node as they are not guaranteed to have a fwnode. They are never * looked up and always handled in the context of the device. */ if (bundle->info.flags & MSI_FLAG_USE_DEV_FWNODE) fwnode = dev->fwnode; else fwnode = fwnalloced = irq_domain_alloc_named_fwnode(bundle->name); if (!fwnode) goto free_bundle; if (msi_setup_device_data(dev)) goto free_fwnode; msi_lock_descs(dev); if (WARN_ON_ONCE(msi_get_device_domain(dev, domid))) goto fail; if (!pops->init_dev_msi_info(dev, parent, parent, &bundle->info)) goto fail; domain = __msi_create_irq_domain(fwnode, &bundle->info, IRQ_DOMAIN_FLAG_MSI_DEVICE, parent); if (!domain) goto fail; domain->dev = dev; dev->msi.data->__domains[domid].domain = domain; msi_unlock_descs(dev); return true; fail: msi_unlock_descs(dev); free_fwnode: irq_domain_free_fwnode(fwnalloced); free_bundle: kfree(bundle); return false; } /** * msi_remove_device_irq_domain - Free a device MSI interrupt domain * @dev: Pointer to the device * @domid: Domain id */ void msi_remove_device_irq_domain(struct device *dev, unsigned int domid) { struct fwnode_handle *fwnode = NULL; struct msi_domain_info *info; struct irq_domain *domain; msi_lock_descs(dev); domain = msi_get_device_domain(dev, domid); if (!domain || !irq_domain_is_msi_device(domain)) goto unlock; dev->msi.data->__domains[domid].domain = NULL; info = domain->host_data; if (irq_domain_is_msi_device(domain)) fwnode = domain->fwnode; irq_domain_remove(domain); irq_domain_free_fwnode(fwnode); kfree(container_of(info, struct msi_domain_template, info)); unlock: msi_unlock_descs(dev); } /** * msi_match_device_irq_domain - Match a device irq domain against a bus token * @dev: Pointer to the device * @domid: Domain id * @bus_token: Bus token to match against the domain bus token * * Return: True if device domain exists and bus tokens match. */ bool msi_match_device_irq_domain(struct device *dev, unsigned int domid, enum irq_domain_bus_token bus_token) { struct msi_domain_info *info; struct irq_domain *domain; bool ret = false; msi_lock_descs(dev); domain = msi_get_device_domain(dev, domid); if (domain && irq_domain_is_msi_device(domain)) { info = domain->host_data; ret = info->bus_token == bus_token; } msi_unlock_descs(dev); return ret; } int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, int nvec, msi_alloc_info_t *arg) { struct msi_domain_info *info = domain->host_data; struct msi_domain_ops *ops = info->ops; return ops->msi_prepare(domain, dev, nvec, arg); } int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, int virq_base, int nvec, msi_alloc_info_t *arg) { struct msi_domain_info *info = domain->host_data; struct msi_domain_ops *ops = info->ops; struct msi_ctrl ctrl = { .domid = MSI_DEFAULT_DOMAIN, .first = virq_base, .last = virq_base + nvec - 1, }; struct msi_desc *desc; struct xarray *xa; int ret, virq; msi_lock_descs(dev); if (!msi_ctrl_valid(dev, &ctrl)) { ret = -EINVAL; goto unlock; } ret = msi_domain_add_simple_msi_descs(dev, &ctrl); if (ret) goto unlock; xa = &dev->msi.data->__domains[ctrl.domid].store; for (virq = virq_base; virq < virq_base + nvec; virq++) { desc = xa_load(xa, virq); desc->irq = virq; ops->set_desc(arg, desc); ret = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg); if (ret) goto fail; irq_set_msi_desc(virq, desc); } msi_unlock_descs(dev); return 0; fail: for (--virq; virq >= virq_base; virq--) { msi_domain_depopulate_descs(dev, virq, 1); irq_domain_free_irqs_common(domain, virq, 1); } msi_domain_free_descs(dev, &ctrl); unlock: msi_unlock_descs(dev); return ret; } void msi_domain_depopulate_descs(struct device *dev, int virq_base, int nvec) { struct msi_ctrl ctrl = { .domid = MSI_DEFAULT_DOMAIN, .first = virq_base, .last = virq_base + nvec - 1, }; struct msi_desc *desc; struct xarray *xa; unsigned long idx; if (!msi_ctrl_valid(dev, &ctrl)) return; xa = &dev->msi.data->__domains[ctrl.domid].store; xa_for_each_range(xa, idx, desc, ctrl.first, ctrl.last) desc->irq = 0; } /* * Carefully check whether the device can use reservation mode. If * reservation mode is enabled then the early activation will assign a * dummy vector to the device. If the PCI/MSI device does not support * masking of the entry then this can result in spurious interrupts when * the device driver is not absolutely careful. But even then a malfunction * of the hardware could result in a spurious interrupt on the dummy vector * and render the device unusable. If the entry can be masked then the core * logic will prevent the spurious interrupt and reservation mode can be * used. For now reservation mode is restricted to PCI/MSI. */ static bool msi_check_reservation_mode(struct irq_domain *domain, struct msi_domain_info *info, struct device *dev) { struct msi_desc *desc; switch(domain->bus_token) { case DOMAIN_BUS_PCI_MSI: case DOMAIN_BUS_PCI_DEVICE_MSI: case DOMAIN_BUS_PCI_DEVICE_MSIX: case DOMAIN_BUS_VMD_MSI: break; default: return false; } if (!(info->flags & MSI_FLAG_MUST_REACTIVATE)) return false; if (IS_ENABLED(CONFIG_PCI_MSI) && pci_msi_ignore_mask) return false; /* * Checking the first MSI descriptor is sufficient. MSIX supports * masking and MSI does so when the can_mask attribute is set. */ desc = msi_first_desc(dev, MSI_DESC_ALL); return desc->pci.msi_attrib.is_msix || desc->pci.msi_attrib.can_mask; } static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc, int allocated) { switch(domain->bus_token) { case DOMAIN_BUS_PCI_MSI: case DOMAIN_BUS_PCI_DEVICE_MSI: case DOMAIN_BUS_PCI_DEVICE_MSIX: case DOMAIN_BUS_VMD_MSI: if (IS_ENABLED(CONFIG_PCI_MSI)) break; fallthrough; default: return -ENOSPC; } /* Let a failed PCI multi MSI allocation retry */ if (desc->nvec_used > 1) return 1; /* If there was a successful allocation let the caller know */ return allocated ? allocated : -ENOSPC; } #define VIRQ_CAN_RESERVE 0x01 #define VIRQ_ACTIVATE 0x02 static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflags) { struct irq_data *irqd = irq_domain_get_irq_data(domain, virq); int ret; if (!(vflags & VIRQ_CAN_RESERVE)) { irqd_clr_can_reserve(irqd); /* * If the interrupt is managed but no CPU is available to * service it, shut it down until better times. Note that * we only do this on the !RESERVE path as x86 (the only * architecture using this flag) deals with this in a * different way by using a catch-all vector. */ if ((vflags & VIRQ_ACTIVATE) && irqd_affinity_is_managed(irqd) && !cpumask_intersects(irq_data_get_affinity_mask(irqd), cpu_online_mask)) { irqd_set_managed_shutdown(irqd); return 0; } } if (!(vflags & VIRQ_ACTIVATE)) return 0; ret = irq_domain_activate_irq(irqd, vflags & VIRQ_CAN_RESERVE); if (ret) return ret; /* * If the interrupt uses reservation mode, clear the activated bit * so request_irq() will assign the final vector. */ if (vflags & VIRQ_CAN_RESERVE) irqd_clr_activated(irqd); return 0; } static int __msi_domain_alloc_irqs(struct device *dev, struct irq_domain *domain, struct msi_ctrl *ctrl) { struct xarray *xa = &dev->msi.data->__domains[ctrl->domid].store; struct msi_domain_info *info = domain->host_data; struct msi_domain_ops *ops = info->ops; unsigned int vflags = 0, allocated = 0; msi_alloc_info_t arg = { }; struct msi_desc *desc; unsigned long idx; int i, ret, virq; ret = msi_domain_prepare_irqs(domain, dev, ctrl->nirqs, &arg); if (ret) return ret; /* * This flag is set by the PCI layer as we need to activate * the MSI entries before the PCI layer enables MSI in the * card. Otherwise the card latches a random msi message. */ if (info->flags & MSI_FLAG_ACTIVATE_EARLY) vflags |= VIRQ_ACTIVATE; /* * Interrupt can use a reserved vector and will not occupy * a real device vector until the interrupt is requested. */ if (msi_check_reservation_mode(domain, info, dev)) vflags |= VIRQ_CAN_RESERVE; xa_for_each_range(xa, idx, desc, ctrl->first, ctrl->last) { if (!msi_desc_match(desc, MSI_DESC_NOTASSOCIATED)) continue; /* This should return -ECONFUSED... */ if (WARN_ON_ONCE(allocated >= ctrl->nirqs)) return -EINVAL; if (ops->prepare_desc) ops->prepare_desc(domain, &arg, desc); ops->set_desc(&arg, desc); virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used, dev_to_node(dev), &arg, false, desc->affinity); if (virq < 0) return msi_handle_pci_fail(domain, desc, allocated); for (i = 0; i < desc->nvec_used; i++) { irq_set_msi_desc_off(virq, i, desc); irq_debugfs_copy_devname(virq + i, dev); ret = msi_init_virq(domain, virq + i, vflags); if (ret) return ret; } if (info->flags & MSI_FLAG_DEV_SYSFS) { ret = msi_sysfs_populate_desc(dev, desc); if (ret) return ret; } allocated++; } return 0; } static int msi_domain_alloc_simple_msi_descs(struct device *dev, struct msi_domain_info *info, struct msi_ctrl *ctrl) { if (!(info->flags & MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS)) return 0; return msi_domain_add_simple_msi_descs(dev, ctrl); } static int __msi_domain_alloc_locked(struct device *dev, struct msi_ctrl *ctrl) { struct msi_domain_info *info; struct msi_domain_ops *ops; struct irq_domain *domain; int ret; if (!msi_ctrl_valid(dev, ctrl)) return -EINVAL; domain = msi_get_device_domain(dev, ctrl->domid); if (!domain) return -ENODEV; info = domain->host_data; ret = msi_domain_alloc_simple_msi_descs(dev, info, ctrl); if (ret) return ret; ops = info->ops; if (ops->domain_alloc_irqs) return ops->domain_alloc_irqs(domain, dev, ctrl->nirqs); return __msi_domain_alloc_irqs(dev, domain, ctrl); } static int msi_domain_alloc_locked(struct device *dev, struct msi_ctrl *ctrl) { int ret = __msi_domain_alloc_locked(dev, ctrl); if (ret) msi_domain_free_locked(dev, ctrl); return ret; } /** * msi_domain_alloc_irqs_range_locked - Allocate interrupts from a MSI interrupt domain * @dev: Pointer to device struct of the device for which the interrupts * are allocated * @domid: Id of the interrupt domain to operate on * @first: First index to allocate (inclusive) * @last: Last index to allocate (inclusive) * * Must be invoked from within a msi_lock_descs() / msi_unlock_descs() * pair. Use this for MSI irqdomains which implement their own descriptor * allocation/free. * * Return: %0 on success or an error code. */ int msi_domain_alloc_irqs_range_locked(struct device *dev, unsigned int domid, unsigned int first, unsigned int last) { struct msi_ctrl ctrl = { .domid = domid, .first = first, .last = last, .nirqs = last + 1 - first, }; return msi_domain_alloc_locked(dev, &ctrl); } /** * msi_domain_alloc_irqs_range - Allocate interrupts from a MSI interrupt domain * @dev: Pointer to device struct of the device for which the interrupts * are allocated * @domid: Id of the interrupt domain to operate on * @first: First index to allocate (inclusive) * @last: Last index to allocate (inclusive) * * Return: %0 on success or an error code. */ int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid, unsigned int first, unsigned int last) { int ret; msi_lock_descs(dev); ret = msi_domain_alloc_irqs_range_locked(dev, domid, first, last); msi_unlock_descs(dev); return ret; } /** * msi_domain_alloc_irqs_all_locked - Allocate all interrupts from a MSI interrupt domain * * @dev: Pointer to device struct of the device for which the interrupts * are allocated * @domid: Id of the interrupt domain to operate on * @nirqs: The number of interrupts to allocate * * This function scans all MSI descriptors of the MSI domain and allocates interrupts * for all unassigned ones. That function is to be used for MSI domain usage where * the descriptor allocation is handled at the call site, e.g. PCI/MSI[X]. * * Return: %0 on success or an error code. */ int msi_domain_alloc_irqs_all_locked(struct device *dev, unsigned int domid, int nirqs) { struct msi_ctrl ctrl = { .domid = domid, .first = 0, .last = msi_domain_get_hwsize(dev, domid) - 1, .nirqs = nirqs, }; return msi_domain_alloc_locked(dev, &ctrl); } static struct msi_map __msi_domain_alloc_irq_at(struct device *dev, unsigned int domid, unsigned int index, const struct irq_affinity_desc *affdesc, union msi_instance_cookie *icookie) { struct msi_ctrl ctrl = { .domid = domid, .nirqs = 1, }; struct irq_domain *domain; struct msi_map map = { }; struct msi_desc *desc; int ret; domain = msi_get_device_domain(dev, domid); if (!domain) { map.index = -ENODEV; return map; } desc = msi_alloc_desc(dev, 1, affdesc); if (!desc) { map.index = -ENOMEM; return map; } if (icookie) desc->data.icookie = *icookie; ret = msi_insert_desc(dev, desc, domid, index); if (ret) { map.index = ret; return map; } ctrl.first = ctrl.last = desc->msi_index; ret = __msi_domain_alloc_irqs(dev, domain, &ctrl); if (ret) { map.index = ret; msi_domain_free_locked(dev, &ctrl); } else { map.index = desc->msi_index; map.virq = desc->irq; } return map; } /** * msi_domain_alloc_irq_at - Allocate an interrupt from a MSI interrupt domain at * a given index - or at the next free index * * @dev: Pointer to device struct of the device for which the interrupts * are allocated * @domid: Id of the interrupt domain to operate on * @index: Index for allocation. If @index == %MSI_ANY_INDEX the allocation * uses the next free index. * @affdesc: Optional pointer to an interrupt affinity descriptor structure * @icookie: Optional pointer to a domain specific per instance cookie. If * non-NULL the content of the cookie is stored in msi_desc::data. * Must be NULL for MSI-X allocations * * This requires a MSI interrupt domain which lets the core code manage the * MSI descriptors. * * Return: struct msi_map * * On success msi_map::index contains the allocated index number and * msi_map::virq the corresponding Linux interrupt number * * On failure msi_map::index contains the error code and msi_map::virq * is %0. */ struct msi_map msi_domain_alloc_irq_at(struct device *dev, unsigned int domid, unsigned int index, const struct irq_affinity_desc *affdesc, union msi_instance_cookie *icookie) { struct msi_map map; msi_lock_descs(dev); map = __msi_domain_alloc_irq_at(dev, domid, index, affdesc, icookie); msi_unlock_descs(dev); return map; } /** * msi_device_domain_alloc_wired - Allocate a "wired" interrupt on @domain * @domain: The domain to allocate on * @hwirq: The hardware interrupt number to allocate for * @type: The interrupt type * * This weirdness supports wire to MSI controllers like MBIGEN. * * @hwirq is the hardware interrupt number which is handed in from * irq_create_fwspec_mapping(). As the wire to MSI domain is sparse, but * sized in firmware, the hardware interrupt number cannot be used as MSI * index. For the underlying irq chip the MSI index is irrelevant and * all it needs is the hardware interrupt number. * * To handle this the MSI index is allocated with MSI_ANY_INDEX and the * hardware interrupt number is stored along with the type information in * msi_desc::cookie so the underlying interrupt chip and domain code can * retrieve it. * * Return: The Linux interrupt number (> 0) or an error code */ int msi_device_domain_alloc_wired(struct irq_domain *domain, unsigned int hwirq, unsigned int type) { unsigned int domid = MSI_DEFAULT_DOMAIN; union msi_instance_cookie icookie = { }; struct device *dev = domain->dev; struct msi_map map = { }; if (WARN_ON_ONCE(!dev || domain->bus_token != DOMAIN_BUS_WIRED_TO_MSI)) return -EINVAL; icookie.value = ((u64)type << 32) | hwirq; msi_lock_descs(dev); if (WARN_ON_ONCE(msi_get_device_domain(dev, domid) != domain)) map.index = -EINVAL; else map = __msi_domain_alloc_irq_at(dev, domid, MSI_ANY_INDEX, NULL, &icookie); msi_unlock_descs(dev); return map.index >= 0 ? map.virq : map.index; } static void __msi_domain_free_irqs(struct device *dev, struct irq_domain *domain, struct msi_ctrl *ctrl) { struct xarray *xa = &dev->msi.data->__domains[ctrl->domid].store; struct msi_domain_info *info = domain->host_data; struct irq_data *irqd; struct msi_desc *desc; unsigned long idx; int i; xa_for_each_range(xa, idx, desc, ctrl->first, ctrl->last) { /* Only handle MSI entries which have an interrupt associated */ if (!msi_desc_match(desc, MSI_DESC_ASSOCIATED)) continue; /* Make sure all interrupts are deactivated */ for (i = 0; i < desc->nvec_used; i++) { irqd = irq_domain_get_irq_data(domain, desc->irq + i); if (irqd && irqd_is_activated(irqd)) irq_domain_deactivate_irq(irqd); } irq_domain_free_irqs(desc->irq, desc->nvec_used); if (info->flags & MSI_FLAG_DEV_SYSFS) msi_sysfs_remove_desc(dev, desc); desc->irq = 0; } } static void msi_domain_free_locked(struct device *dev, struct msi_ctrl *ctrl) { struct msi_domain_info *info; struct msi_domain_ops *ops; struct irq_domain *domain; if (!msi_ctrl_valid(dev, ctrl)) return; domain = msi_get_device_domain(dev, ctrl->domid); if (!domain) return; info = domain->host_data; ops = info->ops; if (ops->domain_free_irqs) ops->domain_free_irqs(domain, dev); else __msi_domain_free_irqs(dev, domain, ctrl); if (ops->msi_post_free) ops->msi_post_free(domain, dev); if (info->flags & MSI_FLAG_FREE_MSI_DESCS) msi_domain_free_descs(dev, ctrl); } /** * msi_domain_free_irqs_range_locked - Free a range of interrupts from a MSI interrupt domain * associated to @dev with msi_lock held * @dev: Pointer to device struct of the device for which the interrupts * are freed * @domid: Id of the interrupt domain to operate on * @first: First index to free (inclusive) * @last: Last index to free (inclusive) */ void msi_domain_free_irqs_range_locked(struct device *dev, unsigned int domid, unsigned int first, unsigned int last) { struct msi_ctrl ctrl = { .domid = domid, .first = first, .last = last, }; msi_domain_free_locked(dev, &ctrl); } /** * msi_domain_free_irqs_range - Free a range of interrupts from a MSI interrupt domain * associated to @dev * @dev: Pointer to device struct of the device for which the interrupts * are freed * @domid: Id of the interrupt domain to operate on * @first: First index to free (inclusive) * @last: Last index to free (inclusive) */ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid, unsigned int first, unsigned int last) { msi_lock_descs(dev); msi_domain_free_irqs_range_locked(dev, domid, first, last); msi_unlock_descs(dev); } /** * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain * associated to a device * @dev: Pointer to device struct of the device for which the interrupts * are freed * @domid: The id of the domain to operate on * * Must be invoked from within a msi_lock_descs() / msi_unlock_descs() * pair. Use this for MSI irqdomains which implement their own vector * allocation. */ void msi_domain_free_irqs_all_locked(struct device *dev, unsigned int domid) { msi_domain_free_irqs_range_locked(dev, domid, 0, msi_domain_get_hwsize(dev, domid) - 1); } /** * msi_domain_free_irqs_all - Free all interrupts from a MSI interrupt domain * associated to a device * @dev: Pointer to device struct of the device for which the interrupts * are freed * @domid: The id of the domain to operate on */ void msi_domain_free_irqs_all(struct device *dev, unsigned int domid) { msi_lock_descs(dev); msi_domain_free_irqs_all_locked(dev, domid); msi_unlock_descs(dev); } /** * msi_device_domain_free_wired - Free a wired interrupt in @domain * @domain: The domain to free the interrupt on * @virq: The Linux interrupt number to free * * This is the counterpart of msi_device_domain_alloc_wired() for the * weird wired to MSI converting domains. */ void msi_device_domain_free_wired(struct irq_domain *domain, unsigned int virq) { struct msi_desc *desc = irq_get_msi_desc(virq); struct device *dev = domain->dev; if (WARN_ON_ONCE(!dev || !desc || domain->bus_token != DOMAIN_BUS_WIRED_TO_MSI)) return; msi_lock_descs(dev); if (!WARN_ON_ONCE(msi_get_device_domain(dev, MSI_DEFAULT_DOMAIN) != domain)) { msi_domain_free_irqs_range_locked(dev, MSI_DEFAULT_DOMAIN, desc->msi_index, desc->msi_index); } msi_unlock_descs(dev); } /** * msi_get_domain_info - Get the MSI interrupt domain info for @domain * @domain: The interrupt domain to retrieve data from * * Return: the pointer to the msi_domain_info stored in @domain->host_data. */ struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) { return (struct msi_domain_info *)domain->host_data; } /** * msi_device_has_isolated_msi - True if the device has isolated MSI * @dev: The device to check * * Isolated MSI means that HW modeled by an irq_domain on the path from the * initiating device to the CPU will validate that the MSI message specifies an * interrupt number that the device is authorized to trigger. This must block * devices from triggering interrupts they are not authorized to trigger. * Currently authorization means the MSI vector is one assigned to the device. * * This is interesting for securing VFIO use cases where a rouge MSI (eg created * by abusing a normal PCI MemWr DMA) must not allow the VFIO userspace to * impact outside its security domain, eg userspace triggering interrupts on * kernel drivers, a VM triggering interrupts on the hypervisor, or a VM * triggering interrupts on another VM. */ bool msi_device_has_isolated_msi(struct device *dev) { struct irq_domain *domain = dev_get_msi_domain(dev); for (; domain; domain = domain->parent) if (domain->flags & IRQ_DOMAIN_FLAG_ISOLATED_MSI) return true; return arch_is_isolated_msi(); } EXPORT_SYMBOL_GPL(msi_device_has_isolated_msi);
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