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CONFIG_PCI_MSI: Message Signaled Interrupts (MSI and MSI-X)

General informations

The Linux kernel configuration item CONFIG_PCI_MSI:

Help text

This allows device drivers to enable MSI (Message Signaled Interrupts). Message Signaled Interrupts enable a device to generate an interrupt using an inbound Memory Write on its PCI bus instead of asserting a device IRQ pin.

Use of PCI MSI interrupts can be disabled at kernel boot time by using the 'pci=nomsi' option. This disables MSI for the entire system.

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Hardware

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