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pci_msix_alloc_irq_at() enables an individual MSI-X interrupt to be allocated after MSI-X enabling. Use dynamic MSI-X (if supported by the device) to allocate an interrupt after MSI-X is enabled. An MSI-X interrupt is dynamically allocated at the time a valid eventfd is assigned. This is different behavior from a range provided during MSI-X enabling where interrupts are allocated for the entire range whether a valid eventfd is provided for each interrupt or not. The PCI-MSIX API requires that some number of irqs are allocated for an initial set of vectors when enabling MSI-X on the device. When dynamic MSIX allocation is not supported, the vector table, and thus the allocated irq set can only be resized by disabling and re-enabling MSI-X with a different range. In that case the irq allocation is essentially a cache for configuring vectors within the previously allocated vector range. When dynamic MSI-X allocation is supported, the API still requires some initial set of irqs to be allocated, but also supports allocating and freeing specific irq vectors both within and beyond the initially allocated range. For consistency between modes, as well as to reduce latency and improve reliability of allocations, and also simplicity, this implementation only releases irqs via pci_free_irq_vectors() when either the interrupt mode changes or the device is released. Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://lore.kernel.org/lkml/20230403211841.0e206b67.alex.williamson@redhat.com/ Reviewed-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/956c47057ae9fd45591feaa82e9ae20929889249.1683740667.git.reinette.chatre@intel.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com> |
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| .. | ||
| fsl-mc | ||
| mdev | ||
| pci | ||
| platform | ||
| container.c | ||
| group.c | ||
| iommufd.c | ||
| iova_bitmap.c | ||
| Kconfig | ||
| Makefile | ||
| vfio_iommu_spapr_tce.c | ||
| vfio_iommu_type1.c | ||
| vfio_main.c | ||
| vfio.h | ||
| virqfd.c | ||