platform-msi: Allow creation of a MSI-based stacked irq domain
We almost have all the needed bits requiredable to create a irq domain
on top of a MSI domain.
For this, we enable a few things:
- the virq is stored in the msi_desc
- device, msi_alloc_info and domain-specific data
are stored in the platform_priv_data structure
- we introduce a new API for platform-msi:
/* Create a MSI-based domain */
struct irq_domain *
platform_msi_create_device_domain(struct device *dev,
unsigned int nvec,
irq_write_msi_msg_t write_msi_msg,
const struct irq_domain_ops *ops,
void *host_data);
/* Allocate MSIs in an MSI domain */
int platform_msi_domain_alloc(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs);
/* Free MSIs from an MSI domain */
void platform_msi_domain_free(struct irq_domain *domain,
unsigned int virq,
unsigned int nvec);
/* Obtain the host data passed to platform_msi_create_device_domain */
void *platform_msi_get_host_data(struct irq_domain *domain);
platform_msi_create_device_domain() is a hybrid of irqdomain creation
and interrupt allocation, creating a domain backed by the MSIs associated
to a device. IRQs can then be allocated in that domain using
platform_msi_domain_alloc().
This now allows a wired irq to MSI bridge to be created.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier
Родитель
2145ac9310
Коммит
552c494a76
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@ -32,6 +32,9 @@
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* and the callback to write the MSI message.
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*/
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struct platform_msi_priv_data {
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struct device *dev;
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void *host_data;
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msi_alloc_info_t arg;
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irq_write_msi_msg_t write_msg;
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int devid;
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};
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@ -124,8 +127,9 @@ static void platform_msi_free_descs(struct device *dev, int base, int nvec)
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}
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}
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static int platform_msi_alloc_descs(struct device *dev, int nvec,
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struct platform_msi_priv_data *data)
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static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
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int nvec,
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struct platform_msi_priv_data *data)
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{
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struct msi_desc *desc;
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@ -145,6 +149,7 @@ static int platform_msi_alloc_descs(struct device *dev, int nvec,
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desc->platform.msi_priv_data = data;
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desc->platform.msi_index = base + i;
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desc->nvec_used = 1;
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desc->irq = virq ? virq + i : 0;
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list_add_tail(&desc->list, dev_to_msi_list(dev));
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}
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@ -159,6 +164,13 @@ static int platform_msi_alloc_descs(struct device *dev, int nvec,
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return 0;
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}
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static int platform_msi_alloc_descs(struct device *dev, int nvec,
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struct platform_msi_priv_data *data)
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{
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return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data);
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}
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/**
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* platform_msi_create_irq_domain - Create a platform MSI interrupt domain
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* @fwnode: Optional fwnode of the interrupt controller
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@ -225,6 +237,7 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
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}
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datap->write_msg = write_msi_msg;
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datap->dev = dev;
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return datap;
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}
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@ -288,3 +301,116 @@ void platform_msi_domain_free_irqs(struct device *dev)
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msi_domain_free_irqs(dev->msi_domain, dev);
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platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
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}
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/**
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* platform_msi_get_host_data - Query the private data associated with
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* a platform-msi domain
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* @domain: The platform-msi domain
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*
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* Returns the private data provided when calling
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* platform_msi_create_device_domain.
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*/
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void *platform_msi_get_host_data(struct irq_domain *domain)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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return data->host_data;
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}
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/**
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* platform_msi_create_device_domain - Create a platform-msi domain
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*
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* @dev: The device generating the MSIs
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* @nvec: The number of MSIs that need to be allocated
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* @write_msi_msg: Callback to write an interrupt message for @dev
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* @ops: The hierarchy domain operations to use
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* @host_data: Private data associated to this domain
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*
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* Returns an irqdomain for @nvec interrupts
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*/
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struct irq_domain *
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platform_msi_create_device_domain(struct device *dev,
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unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct platform_msi_priv_data *data;
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struct irq_domain *domain;
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int err;
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data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg);
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if (IS_ERR(data))
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return NULL;
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data->host_data = host_data;
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domain = irq_domain_create_hierarchy(dev->msi_domain, 0, nvec,
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of_node_to_fwnode(dev->of_node),
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ops, data);
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if (!domain)
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goto free_priv;
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err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg);
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if (err)
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goto free_domain;
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return domain;
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free_domain:
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irq_domain_remove(domain);
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free_priv:
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platform_msi_free_priv_data(data);
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return NULL;
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}
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/**
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* platform_msi_domain_free - Free interrupts associated with a platform-msi
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* domain
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*
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* @domain: The platform-msi domain
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* @virq: The base irq from which to perform the free operation
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* @nvec: How many interrupts to free from @virq
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*/
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void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nvec)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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struct msi_desc *desc;
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for_each_msi_entry(desc, data->dev) {
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if (WARN_ON(!desc->irq || desc->nvec_used != 1))
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return;
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if (!(desc->irq >= virq && desc->irq < (virq + nvec)))
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continue;
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irq_domain_free_irqs_common(domain, desc->irq, 1);
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}
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}
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/**
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* platform_msi_domain_alloc - Allocate interrupts associated with
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* a platform-msi domain
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*
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* @domain: The platform-msi domain
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* @virq: The base irq from which to perform the allocate operation
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* @nvec: How many interrupts to free from @virq
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*
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* Return 0 on success, or an error code on failure. Must be called
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* with irq_domain_mutex held (which can only be done as part of a
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* top-level interrupt allocation).
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*/
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int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct platform_msi_priv_data *data = domain->host_data;
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int err;
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err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data);
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if (err)
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return err;
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err = msi_domain_populate_irqs(domain->parent, data->dev,
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virq, nr_irqs, &data->arg);
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if (err)
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platform_msi_domain_free(domain, virq, nr_irqs);
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return err;
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}
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@ -174,6 +174,7 @@ struct msi_controller {
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#include <asm/msi.h>
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struct irq_domain;
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struct irq_domain_ops;
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struct irq_chip;
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struct device_node;
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struct fwnode_handle;
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@ -285,6 +286,17 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
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int nvec, msi_alloc_info_t *args);
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int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
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int virq, int nvec, msi_alloc_info_t *args);
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struct irq_domain *
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platform_msi_create_device_domain(struct device *dev,
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unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg,
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const struct irq_domain_ops *ops,
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void *host_data);
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int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs);
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void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nvec);
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void *platform_msi_get_host_data(struct irq_domain *domain);
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#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
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#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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