a9a6f0341d
The PCI code is the first user of adapter interrupts vectors. Add a set of helpers to airq.c to separate the adatper interrupt code from the PCI bits. The helpers allow for adapter interrupt vectors of any size. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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* Copyright IBM Corp. 2002, 2007
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* Author(s): Ingo Adlung <adlung@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* Arnd Bergmann <arndb@de.ibm.com>
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#ifndef _ASM_S390_AIRQ_H
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#define _ASM_S390_AIRQ_H
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#include <linux/bit_spinlock.h>
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struct airq_struct {
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struct hlist_node list; /* Handler queueing. */
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void (*handler)(struct airq_struct *); /* Thin-interrupt handler */
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u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
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u8 lsi_mask; /* Local-Summary-Indicator mask */
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u8 isc; /* Interrupt-subclass */
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u8 flags;
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};
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#define AIRQ_PTR_ALLOCATED 0x01
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int register_adapter_interrupt(struct airq_struct *airq);
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void unregister_adapter_interrupt(struct airq_struct *airq);
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/* Adapter interrupt bit vector */
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struct airq_iv {
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unsigned long *vector; /* Adapter interrupt bit vector */
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unsigned long *avail; /* Allocation bit mask for the bit vector */
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unsigned long *bitlock; /* Lock bit mask for the bit vector */
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unsigned long *ptr; /* Pointer associated with each bit */
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unsigned int *data; /* 32 bit value associated with each bit */
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unsigned long bits; /* Number of bits in the vector */
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unsigned long end; /* Number of highest allocated bit + 1 */
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spinlock_t lock; /* Lock to protect alloc & free */
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};
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#define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */
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#define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */
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#define AIRQ_IV_PTR 4 /* Allocate the ptr array */
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#define AIRQ_IV_DATA 8 /* Allocate the data array */
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struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
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void airq_iv_release(struct airq_iv *iv);
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unsigned long airq_iv_alloc_bit(struct airq_iv *iv);
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void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit);
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unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
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unsigned long end);
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static inline unsigned long airq_iv_end(struct airq_iv *iv)
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{
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return iv->end;
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}
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static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_lock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
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{
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const unsigned long be_to_le = BITS_PER_LONG - 1;
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bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
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}
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static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
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unsigned int data)
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{
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iv->data[bit] = data;
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}
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static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->data[bit];
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}
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static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
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unsigned long ptr)
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{
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iv->ptr[bit] = ptr;
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}
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static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
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unsigned long bit)
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{
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return iv->ptr[bit];
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}
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#endif /* _ASM_S390_AIRQ_H */
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