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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-06-25 14:17:57 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-08-22 12:20:02 +0200 |
commit | a9a6f0341df9a634a98aaf252c89962af77d1376 (patch) | |
tree | 92efad15aad3ce29bc86e97720966e06779e6cfb /arch/s390/include | |
parent | 0ea46b0e371e3ccc0ce666c4988a7961e4ffa8ec (diff) | |
download | linux-a9a6f0341df9a634a98aaf252c89962af77d1376.tar.bz2 |
s390/airq: introduce adapter interrupt vector helper
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>
Diffstat (limited to 'arch/s390/include')
-rw-r--r-- | arch/s390/include/asm/airq.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/s390/include/asm/airq.h b/arch/s390/include/asm/airq.h index 4066cee0c2d2..4bbb5957ed1b 100644 --- a/arch/s390/include/asm/airq.h +++ b/arch/s390/include/asm/airq.h @@ -9,6 +9,8 @@ #ifndef _ASM_S390_AIRQ_H #define _ASM_S390_AIRQ_H +#include <linux/bit_spinlock.h> + struct airq_struct { struct hlist_node list; /* Handler queueing. */ void (*handler)(struct airq_struct *); /* Thin-interrupt handler */ @@ -23,4 +25,69 @@ struct airq_struct { int register_adapter_interrupt(struct airq_struct *airq); void unregister_adapter_interrupt(struct airq_struct *airq); +/* Adapter interrupt bit vector */ +struct airq_iv { + unsigned long *vector; /* Adapter interrupt bit vector */ + unsigned long *avail; /* Allocation bit mask for the bit vector */ + unsigned long *bitlock; /* Lock bit mask for the bit vector */ + unsigned long *ptr; /* Pointer associated with each bit */ + unsigned int *data; /* 32 bit value associated with each bit */ + unsigned long bits; /* Number of bits in the vector */ + unsigned long end; /* Number of highest allocated bit + 1 */ + spinlock_t lock; /* Lock to protect alloc & free */ +}; + +#define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */ +#define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */ +#define AIRQ_IV_PTR 4 /* Allocate the ptr array */ +#define AIRQ_IV_DATA 8 /* Allocate the data array */ + +struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags); +void airq_iv_release(struct airq_iv *iv); +unsigned long airq_iv_alloc_bit(struct airq_iv *iv); +void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit); +unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start, + unsigned long end); + +static inline unsigned long airq_iv_end(struct airq_iv *iv) +{ + return iv->end; +} + +static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit) +{ + const unsigned long be_to_le = BITS_PER_LONG - 1; + bit_spin_lock(bit ^ be_to_le, iv->bitlock); +} + +static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit) +{ + const unsigned long be_to_le = BITS_PER_LONG - 1; + bit_spin_unlock(bit ^ be_to_le, iv->bitlock); +} + +static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit, + unsigned int data) +{ + iv->data[bit] = data; +} + +static inline unsigned int airq_iv_get_data(struct airq_iv *iv, + unsigned long bit) +{ + return iv->data[bit]; +} + +static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit, + unsigned long ptr) +{ + iv->ptr[bit] = ptr; +} + +static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv, + unsigned long bit) +{ + return iv->ptr[bit]; +} + #endif /* _ASM_S390_AIRQ_H */ |