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authorHarald Freudenberger <freude@linux.vnet.ibm.com>2016-11-09 15:00:23 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-09-06 09:24:42 +0200
commit46fde9a9d204e322cf4fda391c30213633dcc17f (patch)
tree1ebd485d7fb7ebd1862011d4caade02a4c211935 /arch/s390
parent050349b5b71df52c24989037bd6515cb54c3ef35 (diff)
downloadlinux-46fde9a9d204e322cf4fda391c30213633dcc17f.tar.bz2
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.h36
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_ */