diff options
| author | Harald Freudenberger <freude@linux.vnet.ibm.com> | 2016-11-09 15:00:23 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-09-06 09:24:42 +0200 |
| commit | 46fde9a9d204e322cf4fda391c30213633dcc17f (patch) | |
| tree | 1ebd485d7fb7ebd1862011d4caade02a4c211935 /arch/s390 | |
| parent | 050349b5b71df52c24989037bd6515cb54c3ef35 (diff) | |
| download | linux-46fde9a9d204e322cf4fda391c30213633dcc17f.tar.gz | |
s390/zcrypt: externalize AP queue interrupt control
KVM has a need to control the interrupts on real and virtualized AP queue devices. This fix provides a new function to control the interrupt facilities of an AP queue device. Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/ap.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h index 8cefd6ed981d..c02f4aba88a6 100644 --- a/arch/s390/include/asm/ap.h +++ b/arch/s390/include/asm/ap.h @@ -87,4 +87,40 @@ struct ap_config_info { */ int ap_query_configuration(struct ap_config_info *info); +/* + * struct ap_qirq_ctrl - convenient struct for easy invocation + * of the ap_queue_irq_ctrl() function. This struct is passed + * as GR1 parameter to the PQAP(AQIC) instruction. For details + * please see the AR documentation. + */ +struct ap_qirq_ctrl { + unsigned int _res1 : 8; + unsigned int zone : 8; /* zone info */ + unsigned int ir : 1; /* ir flag: enable (1) or disable (0) irq */ + unsigned int _res2 : 4; + unsigned int gisc : 3; /* guest isc field */ + unsigned int _res3 : 6; + unsigned int gf : 2; /* gisa format */ + unsigned int _res4 : 1; + unsigned int gisa : 27; /* gisa origin */ + unsigned int _res5 : 1; + unsigned int isc : 3; /* irq sub class */ +}; + +/** + * ap_queue_irq_ctrl(): Control interruption on a AP queue. + * @qid: The AP queue number + * @qirqctrl: struct ap_qirq_ctrl, see above + * @ind: The notification indicator byte + * + * Returns AP queue status. + * + * Control interruption on the given AP queue. + * Just a simple wrapper function for the low level PQAP(AQIC) + * instruction available for other kernel modules. + */ +struct ap_queue_status ap_queue_irq_ctrl(ap_qid_t qid, + struct ap_qirq_ctrl qirqctrl, + void *ind); + #endif /* _ASM_S390_AP_H_ */ |