diff options
| author | Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com> | 2016-11-02 10:23:24 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-12-14 16:33:39 +0100 |
| commit | c1c1368de497648cf532e7f37a407361c70aa638 (patch) | |
| tree | 61cab74f5476c11cc7032beebab982b0063f233c /drivers/s390 | |
| parent | 148784246ef2d85f000713cf56e1c90b405228e8 (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')
| -rw-r--r-- | drivers/s390/crypto/ap_bus.c | 3 |
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. |