diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/ap.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h new file mode 100644 index 000000000000..0f3e6f38db55 --- /dev/null +++ b/arch/s390/include/asm/ap.h @@ -0,0 +1,64 @@ +/* + * Adjunct processor (AP) interfaces + * + * Copyright IBM Corp. 2017 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (version 2 only) + * as published by the Free Software Foundation. + * + * Author(s): Tony Krowiak <akrowia@linux.vnet.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * Harald Freudenberger <freude@de.ibm.com> + */ + +#ifndef _ASM_S390_AP_H_ +#define _ASM_S390_AP_H_ + +/** + * The ap_qid_t identifier of an ap queue. + * If the AP facilities test (APFT) facility is available, + * card and queue index are 8 bit values, otherwise + * card index is 6 bit and queue index a 4 bit value. + */ +typedef unsigned int ap_qid_t; + +#define AP_MKQID(_card, _queue) (((_card) & 63) << 8 | ((_queue) & 255)) +#define AP_QID_CARD(_qid) (((_qid) >> 8) & 63) +#define AP_QID_QUEUE(_qid) ((_qid) & 255) + +/** + * struct ap_queue_status - Holds the AP queue status. + * @queue_empty: Shows if queue is empty + * @replies_waiting: Waiting replies + * @queue_full: Is 1 if the queue is full + * @irq_enabled: Shows if interrupts are enabled for the AP + * @response_code: Holds the 8 bit response code + * + * The ap queue status word is returned by all three AP functions + * (PQAP, NQAP and DQAP). There's a set of flags in the first + * byte, followed by a 1 byte response code. + */ +struct ap_queue_status { + unsigned int queue_empty : 1; + unsigned int replies_waiting : 1; + unsigned int queue_full : 1; + unsigned int _pad1 : 4; + unsigned int irq_enabled : 1; + unsigned int response_code : 8; + unsigned int _pad2 : 16; +}; + +/** + * ap_test_queue(): Test adjunct processor queue. + * @qid: The AP queue number + * @tbit: Test facilities bit + * @info: Pointer to queue descriptor + * + * Returns AP queue status structure. + */ +struct ap_queue_status ap_test_queue(ap_qid_t qid, + int tbit, + unsigned long *info); + +#endif /* _ASM_S390_AP_H_ */ |