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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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12
arch/s390/include/asm/irq.h
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@@ -33,6 +33,8 @@ enum interruption_class {
IOINT_APB,
IOINT_ADM,
IOINT_CSC,
IOINT_PCI,
IOINT_MSI,
NMI_NMI,
NR_IRQS,
};
@@ -51,4 +53,14 @@ void service_subclass_irq_unregister(void);
void measurement_alert_subclass_register(void);
void measurement_alert_subclass_unregister(void);
#ifdef CONFIG_LOCKDEP
# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
disable_irq_nosync(irq)
# define disable_irq_lockdep(irq) disable_irq(irq)
# define enable_irq_lockdep(irq) enable_irq(irq)
# define enable_irq_lockdep_irqrestore(irq, flags) \
enable_irq(irq)
#endif
#endif /* _ASM_IRQ_H */