path: root/drivers/s390/crypto/ap_bus.c
diff options
authorIngo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>2016-11-02 10:23:24 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-12-14 16:33:39 +0100
commitc1c1368de497648cf532e7f37a407361c70aa638 (patch)
tree61cab74f5476c11cc7032beebab982b0063f233c /drivers/s390/crypto/ap_bus.c
parent148784246ef2d85f000713cf56e1c90b405228e8 (diff)
s390/zcrypt: Fix ap_max_domain_id for older machine types
According to the system architecture the current implementation requires the presence of the N bit in GR2 in the TAPQ response field to validate the max. number of domains (Nd). Older machine types don't have this N bit, hence the max. domain field was ignored. Before the N bit was introduced the maximum number of domain was a constant value of 15. So set this value in case of N bit absence. Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com> Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index b15013234c77..78c99ae42b1f 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -271,8 +271,11 @@ static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
*facilities = (unsigned int)(info >> 32);
/* Update maximum domain id */
nd = (info >> 16) & 0xff;
+ /* if N bit is available, z13 and newer */
if ((info & (1UL << 57)) && nd > 0)
ap_max_domain_id = nd;
+ else /* older machine types */
+ ap_max_domain_id = 15;
switch (*device_type) {
/* For CEX2 and CEX3 the available functions
* are not refrected by the facilities bits.

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