linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2013-08-22	s390: convert interrupt handling to use generic hardirq	Martin Schwidefsky	1	-14/+3
	With the introduction of PCI it became apparent that s390 should convert to generic hardirqs as too many drivers do not have the correct dependency for GENERIC_HARDIRQS. On the architecture level s390 does not have irq lines. It has external interrupts, I/O interrupts and adapter interrupts. This patch hard-codes all external interrupts as irq #1, all I/O interrupts as irq #2 and all adapter interrupts as irq #3. The additional information from the lowcore associated with the interrupt is stored in the pt_regs of the interrupt frame, where the interrupt handler can pick it up. For PCI/MSI interrupts the adapter interrupt handler scans the relevant bit fields and calls generic_handle_irq with the virtual irq number for the MSI interrupt. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-11-30	s390/pci: PCI adapter interrupts for MSI/MSI-X	Jan Glauber	1	-0/+22
	Support PCI adapter interrupts using the Single-IRQ-mode. Single-IRQ-mode disables an adapter IRQ automatically after delivering it until the SIC instruction enables it again. This is used to reduce the number of IRQs for streaming workloads. Up to 64 MSI handlers can be registered per PCI function. A hash table is used to map interrupt numbers to MSI descriptors. The interrupt vector is scanned using the flogr instruction. Only MSI/MSI-X interrupts are supported, no legacy INTs. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>