diff options
Diffstat (limited to 'kernel/irq/msi.c')
| -rw-r--r-- | kernel/irq/msi.c | 1667 |
1 files changed, 1667 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c new file mode 100644 index 0000000000..79b4a58ba9 --- /dev/null +++ b/kernel/irq/msi.c @@ -0,0 +1,1667 @@ +// 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 const struct irq_domain_ops msi_domain_ops = { + .alloc = msi_domain_alloc, + .free = msi_domain_free, + .activate = msi_domain_activate, + .deactivate = msi_domain_deactivate, +}; + +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); + + 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; + const struct msi_parent_ops *pops; + struct msi_domain_template *bundle; + struct fwnode_handle *fwnode; + + 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; + + fwnode = 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(fwnode); +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); +} + +/** + * 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_ctrl ctrl = { .domid = domid, .nirqs = 1, }; + struct irq_domain *domain; + struct msi_map map = { }; + struct msi_desc *desc; + int ret; + + msi_lock_descs(dev); + domain = msi_get_device_domain(dev, domid); + if (!domain) { + map.index = -ENODEV; + goto unlock; + } + + desc = msi_alloc_desc(dev, 1, affdesc); + if (!desc) { + map.index = -ENOMEM; + goto unlock; + } + + if (icookie) + desc->data.icookie = *icookie; + + ret = msi_insert_desc(dev, desc, domid, index); + if (ret) { + map.index = ret; + goto unlock; + } + + 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; + } +unlock: + msi_unlock_descs(dev); + return map; +} + +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_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); |