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s390/zcrypt: externalize AP queue interrupt control

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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>
This commit is contained in:
Harald Freudenberger
2016-11-09 15:00:23 +01:00
committed by Martin Schwidefsky
parent 050349b5b7
commit 46fde9a9d2
3 changed files with 65 additions and 4 deletions
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24
drivers/s390/crypto/ap_queue.c
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@@ -15,6 +15,25 @@
#include "ap_bus.h"
#include "ap_asm.h"
/**
* ap_queue_irq_ctrl(): Control interruption on a AP queue.
* @qirqctrl: struct ap_qirq_ctrl (64 bit value)
* @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)
{
return ap_aqic(qid, qirqctrl, ind);
}
EXPORT_SYMBOL(ap_queue_irq_ctrl);
/**
* ap_queue_enable_interruption(): Enable interruption on an AP queue.
* @qid: The AP queue number
@@ -27,8 +46,11 @@
static int ap_queue_enable_interruption(struct ap_queue *aq, void *ind)
{
struct ap_queue_status status;
struct ap_qirq_ctrl qirqctrl = { 0 };
status = ap_aqic(aq->qid, ind);
qirqctrl.ir = 1;
qirqctrl.isc = AP_ISC;
status = ap_aqic(aq->qid, qirqctrl, ind);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
case AP_RESPONSE_OTHERWISE_CHANGED: