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s390/pci: PCI adapter interrupts for MSI/MSI-X

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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>
This commit is contained in:
Jan Glauber
2012-11-29 13:05:05 +01:00
committed by Martin Schwidefsky
parent e56e4e87e3
commit 9a4da8a5b1
11 changed files with 683 additions and 7 deletions
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arch/s390/kernel/irq.c
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@@ -58,6 +58,8 @@ static const struct irq_class intrclass_names[] = {
[IOINT_APB] = {.name = "APB", .desc = "[I/O] AP Bus"},
[IOINT_ADM] = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
[IOINT_CSC] = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
[IOINT_PCI] = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
[IOINT_MSI] = {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
[NMI_NMI] = {.name = "NMI", .desc = "[NMI] Machine Check"},
};