lkl: Add MSI and MSI-X support - #642
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Add PCI MSI/MSI-X interrupt support for LKL PCI devices. Implement LKL arch MSI hooks so PCI drivers can allocate MSI and MSI-X vectors through the generic PCI MSI fallback path. MSI vectors are backed by contiguous LKL IRQ blocks, while MSI-X vectors preserve sparse hardware vector indexes. The setup path associates MSI descriptors with LKL IRQs, installs an MSI irq_chip, programs the MSI multiple-message enable value, and unwinds IRQ state on failures. Extend the LKL PCI host ABI with MSI/MSI-X setup and teardown callbacks, and teach the VFIO PCI host backend to wire VFIO MSI/MSI-X eventfds to LKL IRQs. When MSI/MSI-X is enabled, the VFIO backend disables the INTx path, polls the MSI eventfds, triggers the matching LKL IRQs, and restores INTx when MSI/MSI-X is torn down. Also fix LKL ioremap handling for BAR offsets and add KUnit coverage for MSI IRQ allocation, sparse MSI-X vector indexes, and failure unwind paths. Enable PCI_MSI in the LKL defconfig and include the MSI KUnit suite in the LKL test configuration. Signed-off-by: Cheng Lingfei <chenglingfei@foxmail.com>
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Thanks. Test failures have been fixed |
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Add PCI MSI/MSI-X interrupt support for LKL PCI devices.
Implement LKL arch MSI hooks so PCI drivers can allocate MSI and MSI-X vectors through the generic PCI MSI fallback path. MSI vectors are backed by contiguous LKL IRQ blocks, while MSI-X vectors preserve sparse hardware vector indexes. The setup path associates MSI descriptors with LKL IRQs, installs an MSI irq_chip, programs the MSI multiple-message enable value, and unwinds IRQ state on failures.
Extend the LKL PCI host ABI with MSI/MSI-X setup and teardown callbacks, and teach the VFIO PCI host backend to wire VFIO MSI/MSI-X eventfds to LKL IRQs. When MSI/MSI-X is enabled, the VFIO backend disables the INTx path, polls the MSI eventfds, triggers the matching LKL IRQs, and restores INTx when MSI/MSI-X is torn down.
Also fix LKL ioremap handling for BAR offsets and add KUnit coverage for MSI IRQ allocation, sparse MSI-X vector indexes, and failure unwind paths. Enable PCI_MSI in the LKL defconfig and include the MSI KUnit suite in the LKL test configuration.