diff options
Diffstat (limited to 'kernel/irq/msi.c')
| -rw-r--r-- | kernel/irq/msi.c | 915 |
1 files changed, 744 insertions, 171 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index a9ee535293eb..955267bbc2be 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -19,8 +19,31 @@ #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 @@ -33,7 +56,7 @@ static inline int msi_sysfs_create_group(struct device *dev); * 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) + const struct irq_affinity_desc *affinity) { struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL); @@ -58,25 +81,56 @@ static void msi_free_desc(struct msi_desc *desc) kfree(desc); } -static int msi_insert_desc(struct msi_device_data *md, struct msi_desc *desc, unsigned int index) +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; - desc->msi_index = index; - ret = xa_insert(&md->__store, index, desc, GFP_KERNEL); - if (ret) - msi_free_desc(desc); + 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_add_msi_desc - Allocate and initialize a MSI descriptor + * 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_add_msi_desc(struct device *dev, struct msi_desc *init_desc) +int msi_domain_insert_msi_desc(struct device *dev, unsigned int domid, + struct msi_desc *init_desc) { struct msi_desc *desc; @@ -88,40 +142,8 @@ int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc) /* Copy type specific data to the new descriptor. */ desc->pci = init_desc->pci; - return msi_insert_desc(dev->msi.data, desc, init_desc->msi_index); -} -/** - * msi_add_simple_msi_descs - Allocate and initialize MSI descriptors - * @dev: Pointer to the device for which the descriptors are allocated - * @index: Index for the first MSI descriptor - * @ndesc: Number of descriptors to allocate - * - * Return: 0 on success or an appropriate failure code. - */ -static int msi_add_simple_msi_descs(struct device *dev, unsigned int index, unsigned int ndesc) -{ - unsigned int idx, last = index + ndesc - 1; - struct msi_desc *desc; - int ret; - - lockdep_assert_held(&dev->msi.data->mutex); - - for (idx = index; idx <= last; idx++) { - desc = msi_alloc_desc(dev, 1, NULL); - if (!desc) - goto fail_mem; - ret = msi_insert_desc(dev->msi.data, desc, idx); - if (ret) - goto fail; - } - return 0; - -fail_mem: - ret = -ENOMEM; -fail: - msi_free_msi_descs_range(dev, MSI_DESC_NOTASSOCIATED, index, last); - return ret; + 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) @@ -138,28 +160,97 @@ static bool msi_desc_match(struct msi_desc *desc, enum msi_desc_filter filter) 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_free_msi_descs_range - Free MSI descriptors of a device - * @dev: Device to free the descriptors - * @filter: Descriptor state filter - * @first_index: Index to start freeing from - * @last_index: Last index to be freed + * 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_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter, - unsigned int first_index, unsigned int last_index) +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 xarray *xa = &dev->msi.data->__store; struct msi_desc *desc; - unsigned long idx; + unsigned int idx; + int ret; lockdep_assert_held(&dev->msi.data->mutex); - xa_for_each_range(xa, idx, desc, first_index, last_index) { - if (msi_desc_match(desc, filter)) { - xa_erase(xa, idx); - msi_free_desc(desc); - } + 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) @@ -178,9 +269,13 @@ 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; - WARN_ON_ONCE(!xa_empty(&md->__store)); - xa_destroy(&md->__store); + 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; } @@ -197,7 +292,7 @@ static void msi_device_data_release(struct device *dev, void *res) int msi_setup_device_data(struct device *dev) { struct msi_device_data *md; - int ret; + int ret, i; if (dev->msi.data) return 0; @@ -212,7 +307,18 @@ int msi_setup_device_data(struct device *dev) return ret; } - xa_init(&md->__store); + 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); @@ -235,27 +341,30 @@ EXPORT_SYMBOL_GPL(msi_lock_descs); */ void msi_unlock_descs(struct device *dev) { - /* Invalidate the index wich was cached by the iterator */ - dev->msi.data->__iter_idx = MSI_MAX_INDEX; + /* 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, enum msi_desc_filter filter) +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(&md->__store, md->__iter_idx, desc, md->__iter_idx) { + xa_for_each_start(xa, md->__iter_idx, desc, md->__iter_idx) { if (msi_desc_match(desc, filter)) return desc; } - md->__iter_idx = MSI_MAX_INDEX; + md->__iter_idx = MSI_XA_MAX_INDEX; return NULL; } /** - * msi_first_desc - Get the first MSI descriptor of a device + * 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() @@ -264,23 +373,26 @@ static struct msi_desc *msi_find_desc(struct msi_device_data *md, enum msi_desc_ * Return: Pointer to the first MSI descriptor matching the search * criteria, NULL if none found. */ -struct msi_desc *msi_first_desc(struct device *dev, enum msi_desc_filter filter) +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)) + 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, filter); + return msi_find_desc(md, domid, filter); } -EXPORT_SYMBOL_GPL(msi_first_desc); +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 @@ -290,11 +402,12 @@ EXPORT_SYMBOL_GPL(msi_first_desc); * Return: Pointer to the next MSI descriptor matching the search * criteria, NULL if none found. */ -struct msi_desc *msi_next_desc(struct device *dev, enum msi_desc_filter filter) +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)) + if (WARN_ON_ONCE(!md || domid >= MSI_MAX_DEVICE_IRQDOMAINS)) return NULL; lockdep_assert_held(&md->mutex); @@ -303,30 +416,38 @@ struct msi_desc *msi_next_desc(struct device *dev, enum msi_desc_filter filter) return NULL; md->__iter_idx++; - return msi_find_desc(md, filter); + return msi_find_desc(md, domid, filter); } EXPORT_SYMBOL_GPL(msi_next_desc); /** - * msi_get_virq - Return Linux interrupt number of a MSI interrupt + * 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_get_virq(struct device *dev, unsigned int index) +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; + bool pcimsi = false; + struct xarray *xa; if (!dev->msi.data) return 0; - pcimsi = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false; + 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); - desc = xa_load(&dev->msi.data->__store, pcimsi ? 0 : index); + 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. @@ -340,10 +461,11 @@ unsigned int msi_get_virq(struct device *dev, unsigned int index) ret = desc->irq; } } + msi_unlock_descs(dev); return ret; } -EXPORT_SYMBOL_GPL(msi_get_virq); +EXPORT_SYMBOL_GPL(msi_domain_get_virq); #ifdef CONFIG_SYSFS static struct attribute *msi_dev_attrs[] = { @@ -459,7 +581,39 @@ static inline int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *d static inline void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc) { } #endif /* !CONFIG_SYSFS */ -#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN +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) { @@ -613,21 +767,11 @@ static int msi_domain_ops_init(struct irq_domain *domain, return 0; } -static int msi_domain_ops_check(struct irq_domain *domain, - struct msi_domain_info *info, - struct device *dev) -{ - 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_check = msi_domain_ops_check, .msi_prepare = msi_domain_ops_prepare, .set_desc = msi_domain_ops_set_desc, - .domain_alloc_irqs = __msi_domain_alloc_irqs, - .domain_free_irqs = __msi_domain_free_irqs, }; static void msi_domain_update_dom_ops(struct msi_domain_info *info) @@ -639,11 +783,6 @@ static void msi_domain_update_dom_ops(struct msi_domain_info *info) return; } - if (ops->domain_alloc_irqs == NULL) - ops->domain_alloc_irqs = msi_domain_ops_default.domain_alloc_irqs; - if (ops->domain_free_irqs == NULL) - ops->domain_free_irqs = msi_domain_ops_default.domain_free_irqs; - if (!(info->flags & MSI_FLAG_USE_DEF_DOM_OPS)) return; @@ -651,8 +790,6 @@ static void msi_domain_update_dom_ops(struct msi_domain_info *info) 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_check == NULL) - ops->msi_check = msi_domain_ops_default.msi_check; if (ops->msi_prepare == NULL) ops->msi_prepare = msi_domain_ops_default.msi_prepare; if (ops->set_desc == NULL) @@ -668,6 +805,40 @@ static void msi_domain_update_chip_ops(struct msi_domain_info *info) 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) { + if (!domain->name && info->chip) + domain->name = info->chip->name; + 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 @@ -680,19 +851,210 @@ 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: + kfree(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 msi_domain_info *info; struct irq_domain *domain; - msi_domain_update_dom_ops(info); - if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) - msi_domain_update_chip_ops(info); + msi_lock_descs(dev); - domain = irq_domain_create_hierarchy(parent, IRQ_DOMAIN_FLAG_MSI, 0, - fwnode, &msi_domain_ops, info); + domain = msi_get_device_domain(dev, domid); - if (domain && !domain->name && info->chip) - domain->name = info->chip->name; + if (!domain || !irq_domain_is_msi_device(domain)) + goto unlock; - return domain; + dev->msi.data->__domains[domid].domain = NULL; + info = domain->host_data; + irq_domain_remove(domain); + 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, @@ -700,13 +1062,8 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, { struct msi_domain_info *info = domain->host_data; struct msi_domain_ops *ops = info->ops; - int ret; - - ret = ops->msi_check(domain, info, dev); - if (ret == 0) - ret = ops->msi_prepare(domain, dev, nvec, arg); - return ret; + return ops->msi_prepare(domain, dev, nvec, arg); } int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, @@ -714,16 +1071,27 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, { 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; + if (!msi_ctrl_valid(dev, &ctrl)) + return -EINVAL; + msi_lock_descs(dev); - ret = msi_add_simple_msi_descs(dev, virq_base, nvec); + 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(&dev->msi.data->__store, virq); + desc = xa_load(xa, virq); desc->irq = virq; ops->set_desc(arg, desc); @@ -739,7 +1107,7 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, fail: for (--virq; virq >= virq_base; virq--) irq_domain_free_irqs_common(domain, virq, 1); - msi_free_msi_descs_range(dev, MSI_DESC_ALL, virq_base, virq_base + nvec - 1); + msi_domain_free_descs(dev, &ctrl); unlock: msi_unlock_descs(dev); return ret; @@ -764,6 +1132,8 @@ static bool msi_check_reservation_mode(struct irq_domain *domain, 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: @@ -789,6 +1159,8 @@ static int msi_handle_pci_fail(struct irq_domain *domain, 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: if (IS_ENABLED(CONFIG_PCI_MSI)) break; @@ -850,18 +1222,19 @@ static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflag return 0; } -int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, - int nvec) +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 = { }; - unsigned int vflags = 0; struct msi_desc *desc; - int allocated = 0; + unsigned long idx; int i, ret, virq; - ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg); + ret = msi_domain_prepare_irqs(domain, dev, ctrl->nirqs, &arg); if (ret) return ret; @@ -883,11 +1256,21 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, * MSI affinity setting requires a special quirk (X86) when * reservation mode is active. */ - if (domain->flags & IRQ_DOMAIN_MSI_NOMASK_QUIRK) + if (info->flags & MSI_FLAG_NOMASK_QUIRK) vflags |= VIRQ_NOMASK_QUIRK; } - msi_for_each_desc(desc, dev, MSI_DESC_NOTASSOCIATED) { + 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, @@ -913,76 +1296,213 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, return 0; } -static int msi_domain_add_simple_msi_descs(struct msi_domain_info *info, - struct device *dev, - unsigned int num_descs) +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_add_simple_msi_descs(dev, 0, num_descs); + 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_descs_locked - Allocate interrupts from a MSI interrupt domain - * @domain: The domain to allocate from + * 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 - * @nvec: The number of interrupts to allocate + * @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 vector + * 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_descs_locked(struct irq_domain *domain, struct device *dev, - int nvec) +int msi_domain_alloc_irqs_range_locked(struct device *dev, unsigned int domid, + unsigned int first, unsigned int last) { - struct msi_domain_info *info = domain->host_data; - struct msi_domain_ops *ops = info->ops; - int ret; - - lockdep_assert_held(&dev->msi.data->mutex); + struct msi_ctrl ctrl = { + .domid = domid, + .first = first, + .last = last, + .nirqs = last + 1 - first, + }; + + return msi_domain_alloc_locked(dev, &ctrl); +} - ret = msi_domain_add_simple_msi_descs(info, dev, nvec); - if (ret) - return ret; +/** + * 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; - ret = ops->domain_alloc_irqs(domain, dev, nvec); - if (ret) - msi_domain_free_irqs_descs_locked(domain, dev); + 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 - Allocate interrupts from a MSI interrupt domain - * @domain: The domain to allocate from + * 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 - * @nvec: The number of interrupts to allocate + * @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(struct irq_domain *domain, struct device *dev, int nvec) +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); - ret = msi_domain_alloc_irqs_descs_locked(domain, dev, nvec); + 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 ret; + return map; } -void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) +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; - /* Only handle MSI entries which have an interrupt associated */ - msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) { + 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); @@ -997,44 +1517,99 @@ void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) } } -static void msi_domain_free_msi_descs(struct msi_domain_info *info, - struct device *dev) +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_free_msi_descs(dev); + msi_domain_free_descs(dev, ctrl); } /** - * msi_domain_free_irqs_descs_locked - Free interrupts from a MSI interrupt @domain associated to @dev - * @domain: The domain to managing the interrupts + * 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 free + * 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_descs_locked(struct irq_domain *domain, struct device *dev) +void msi_domain_free_irqs_all_locked(struct device *dev, unsigned int domid) { - struct msi_domain_info *info = domain->host_data; - struct msi_domain_ops *ops = info->ops; - - lockdep_assert_held(&dev->msi.data->mutex); - - ops->domain_free_irqs(domain, dev); - msi_domain_free_msi_descs(info, dev); + msi_domain_free_irqs_range_locked(dev, domid, 0, + msi_domain_get_hwsize(dev, domid) - 1); } /** - * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated to @dev - * @domain: The domain to managing the interrupts + * 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 free + * are freed + * @domid: The id of the domain to operate on */ -void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) +void msi_domain_free_irqs_all(struct device *dev, unsigned int domid) { msi_lock_descs(dev); - msi_domain_free_irqs_descs_locked(domain, dev); + msi_domain_free_irqs_all_locked(dev, domid); msi_unlock_descs(dev); } @@ -1048,5 +1623,3 @@ struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) { return (struct msi_domain_info *)domain->host_data; } - -#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ |