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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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10
include/linux/irq.h
View file

@ -10,9 +10,6 @@
*/
#include <linux/smp.h>
#ifndef CONFIG_S390
#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
@ -737,8 +734,11 @@ static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
#endif
#else /* !CONFIG_GENERIC_HARDIRQS */
extern struct msi_desc *irq_get_msi_desc(unsigned int irq);
extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
#endif /* CONFIG_GENERIC_HARDIRQS */
#endif /* !CONFIG_S390 */
#endif /* _LINUX_IRQ_H */