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PCI/MSI: Provide pci_ims_alloc/free_irq()
Single vector allocation which allocates the next free index in the IMS space. The free function releases. All allocated vectors are released also via pci_free_vectors() which is also releasing MSI/MSI-X vectors. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221124232326.961711347@linutronix.de
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@ -365,6 +365,56 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
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}
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EXPORT_SYMBOL(pci_irq_get_affinity);
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/**
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* pci_ims_alloc_irq - Allocate an interrupt on a PCI/IMS interrupt domain
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* @dev: The PCI device to operate on
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* @icookie: Pointer to an IMS implementation specific cookie for this
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* IMS instance (PASID, queue ID, pointer...).
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* The cookie content is copied into the MSI descriptor for the
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* interrupt chip callbacks or domain specific setup functions.
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* @affdesc: Optional pointer to an interrupt affinity descriptor
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*
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* There is no index for IMS allocations as IMS is an implementation
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* specific storage and does not have any direct associations between
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* index, which might be a pure software construct, and device
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* functionality. This association is established by the driver either via
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* the index - if there is a hardware table - or in case of purely software
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* managed IMS implementation the association happens via the
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* irq_write_msi_msg() callback of the implementation specific interrupt
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* chip, which utilizes the provided @icookie to store the MSI message in
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* the appropriate place.
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*
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* Return: A struct msi_map
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*
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* On success msi_map::index contains the allocated index (>= 0) and
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* msi_map::virq the allocated Linux interrupt number (> 0).
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*
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* On fail msi_map::index contains the error code and msi_map::virq
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* is set to 0.
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*/
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struct msi_map pci_ims_alloc_irq(struct pci_dev *dev, union msi_instance_cookie *icookie,
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const struct irq_affinity_desc *affdesc)
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{
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return msi_domain_alloc_irq_at(&dev->dev, MSI_SECONDARY_DOMAIN, MSI_ANY_INDEX,
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affdesc, icookie);
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}
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EXPORT_SYMBOL_GPL(pci_ims_alloc_irq);
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/**
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* pci_ims_free_irq - Allocate an interrupt on a PCI/IMS interrupt domain
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* which was allocated via pci_ims_alloc_irq()
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* @dev: The PCI device to operate on
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* @map: A struct msi_map describing the interrupt to free as
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* returned from pci_ims_alloc_irq()
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*/
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void pci_ims_free_irq(struct pci_dev *dev, struct msi_map map)
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{
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if (WARN_ON_ONCE(map.index < 0 || map.virq <= 0))
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return;
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msi_domain_free_irqs_range(&dev->dev, MSI_SECONDARY_DOMAIN, map.index, map.index);
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}
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EXPORT_SYMBOL_GPL(pci_ims_free_irq);
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/**
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* pci_free_irq_vectors() - Free previously allocated IRQs for a device
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* @dev: the PCI device to operate on
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@ -2491,6 +2491,9 @@ struct msi_domain_template;
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bool pci_create_ims_domain(struct pci_dev *pdev, const struct msi_domain_template *template,
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unsigned int hwsize, void *data);
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struct msi_map pci_ims_alloc_irq(struct pci_dev *pdev, union msi_instance_cookie *icookie,
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const struct irq_affinity_desc *affdesc);
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void pci_ims_free_irq(struct pci_dev *pdev, struct msi_map map);
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#include <linux/dma-mapping.h>
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