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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_MSI_API_H
#define LINUX_MSI_API_H
/*
* APIs which are relevant for device driver code for allocating and
* freeing MSI interrupts and querying the associations between
* hardware/software MSI indices and the Linux interrupt number.
*/
struct device;
/*
* Per device interrupt domain related constants.
*/
enum msi_domain_ids {
MSI_DEFAULT_DOMAIN,
MSI_MAX_DEVICE_IRQDOMAINS,
};
/**
* union msi_instance_cookie - MSI instance cookie
* @value: u64 value store
* @ptr: Pointer to usage site specific data
*
* This cookie is handed to the IMS allocation function and stored in the
* MSI descriptor for the interrupt chip callbacks.
*
* The content of this cookie is MSI domain implementation defined. For
* PCI/IMS implementations this could be a PASID or a pointer to queue
* memory.
*/
union msi_instance_cookie {
u64 value;
void *ptr;
};
/**
* msi_map - Mapping between MSI index and Linux interrupt number
* @index: The MSI index, e.g. slot in the MSI-X table or
* a software managed index if >= 0. If negative
* the allocation function failed and it contains
* the error code.
* @virq: The associated Linux interrupt number
*/
struct msi_map {
int index;
int virq;
};
/*
* Constant to be used for dynamic allocations when the allocation is any
* free MSI index, which is either an entry in a hardware table or a
* software managed index.
*/
#define MSI_ANY_INDEX UINT_MAX
unsigned int msi_domain_get_virq(struct device *dev, unsigned int domid, unsigned int index);
/**
* msi_get_virq - Lookup the Linux interrupt number for a MSI index on the default interrupt domain
* @dev: Device for which the lookup happens
* @index: The MSI index to lookup
*
* Return: The Linux interrupt number on success (> 0), 0 if not found
*/
static inline unsigned int msi_get_virq(struct device *dev, unsigned int index)
{
return msi_domain_get_virq(dev, MSI_DEFAULT_DOMAIN, index);
}
#endif
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