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s390/airq: simplify adapter interrupt code

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There are three users of adapter interrupts: AP, QDIO and PCI. Each
registers a single adapter interrupt with independent ISCs. Define
a "struct airq" with the interrupt handler, a pointer and a mask for
the local summary indicator and the ISC for the adapter interrupt
source. Convert the indicator array with its fixed number of adapter
interrupt sources per ISE to an array of hlists. This removes the
limitation to 32 adapter interrupts per ISC and allows for arbitrary
memory locations for the local summary indicator.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2013-06-24 10:30:41 +02:00
parent 386aa051fb
commit f4eae94f71
5 changed files with 130 additions and 168 deletions
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15
arch/s390/include/asm/airq.h
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@@ -9,9 +9,18 @@
#ifndef _ASM_S390_AIRQ_H
#define _ASM_S390_AIRQ_H
typedef void (*adapter_int_handler_t)(void *, void *);
struct airq_struct {
struct hlist_node list; /* Handler queueing. */
void (*handler)(struct airq_struct *); /* Thin-interrupt handler */
u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
u8 lsi_mask; /* Local-Summary-Indicator mask */
u8 isc; /* Interrupt-subclass */
u8 flags;
};
void *s390_register_adapter_interrupt(adapter_int_handler_t, void *, u8);
void s390_unregister_adapter_interrupt(void *, u8);
#define AIRQ_PTR_ALLOCATED 0x01
int register_adapter_interrupt(struct airq_struct *airq);
void unregister_adapter_interrupt(struct airq_struct *airq);
#endif /* _ASM_S390_AIRQ_H */