| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef LINUX_MSI_API_H |
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| 3 | #define LINUX_MSI_API_H |
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| 4 | |
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| 5 | /* |
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| 6 | * APIs which are relevant for device driver code for allocating and |
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| 7 | * freeing MSI interrupts and querying the associations between |
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| 8 | * hardware/software MSI indices and the Linux interrupt number. |
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| 9 | */ |
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| 10 | |
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| 11 | struct device; |
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| 12 | |
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| 13 | /* |
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| 14 | * Per device interrupt domain related constants. |
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| 15 | */ |
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| 16 | enum msi_domain_ids { |
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| 17 | MSI_DEFAULT_DOMAIN, |
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| 18 | MSI_MAX_DEVICE_IRQDOMAINS, |
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| 19 | }; |
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| 20 | |
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| 21 | /** |
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| 22 | * union msi_instance_cookie - MSI instance cookie |
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| 23 | * @value: u64 value store |
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| 24 | * @ptr: Pointer to usage site specific data |
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| 25 | * |
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| 26 | * This cookie is handed to the IMS allocation function and stored in the |
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| 27 | * MSI descriptor for the interrupt chip callbacks. |
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| 28 | * |
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| 29 | * The content of this cookie is MSI domain implementation defined. For |
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| 30 | * PCI/IMS implementations this could be a PASID or a pointer to queue |
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| 31 | * memory. |
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| 32 | */ |
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| 33 | union msi_instance_cookie { |
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| 34 | u64 value; |
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| 35 | void *ptr; |
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| 36 | }; |
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| 37 | |
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| 38 | /** |
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| 39 | * msi_map - Mapping between MSI index and Linux interrupt number |
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| 40 | * @index: The MSI index, e.g. slot in the MSI-X table or |
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| 41 | * a software managed index if >= 0. If negative |
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| 42 | * the allocation function failed and it contains |
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| 43 | * the error code. |
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| 44 | * @virq: The associated Linux interrupt number |
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| 45 | */ |
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| 46 | struct msi_map { |
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| 47 | int index; |
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| 48 | int virq; |
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| 49 | }; |
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| 50 | |
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| 51 | /* |
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| 52 | * Constant to be used for dynamic allocations when the allocation is any |
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| 53 | * free MSI index, which is either an entry in a hardware table or a |
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| 54 | * software managed index. |
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| 55 | */ |
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| 56 | #define MSI_ANY_INDEX UINT_MAX |
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| 57 | |
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| 58 | unsigned int msi_domain_get_virq(struct device *dev, unsigned int domid, unsigned int index); |
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| 59 | |
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| 60 | /** |
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| 61 | * msi_get_virq - Lookup the Linux interrupt number for a MSI index on the default interrupt domain |
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| 62 | * @dev: Device for which the lookup happens |
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| 63 | * @index: The MSI index to lookup |
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| 64 | * |
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| 65 | * Return: The Linux interrupt number on success (> 0), 0 if not found |
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| 66 | */ |
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| 67 | static inline unsigned int msi_get_virq(struct device *dev, unsigned int index) |
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| 68 | { |
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| 69 | return msi_domain_get_virq(dev, domid: MSI_DEFAULT_DOMAIN, index); |
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| 70 | } |
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| 71 | |
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| 72 | #endif |
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| 73 | |
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