[PATCH v1] s390/ap: Support new APMLM field with PQAP/TAPQ instruction

[Harald Freudenberger <freude@linux.ibm.com>]

There is a new field APMLM (AP message limit multiplier) defined
within the GR2 register on successful invocation of the TAPQ
subfunction for the PQAP instruction.

So the new formula to calculate the AP max message limit is now:

  if ml field <= 3
    AP max message limit is 12KB
  else
    AP max message limit = apml * (apmlm + 1) * 4KB

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
---
 arch/s390/include/asm/ap.h    | 4 ++--
 drivers/s390/crypto/ap_card.c | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index c91b6ace199d..01d575c35887 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -123,8 +123,8 @@ struct ap_tapq_hwinfo {
 			unsigned int	   : 14;
 			unsigned int at	   :  8; /* ap type */
 			unsigned int nd	   :  8; /* nr of domains */
-			unsigned int	   :  4;
-			unsigned int ml	   :  4; /* apxl ml */
+			unsigned int mlm   :  4; /* AP msg limit multiplier */
+			unsigned int ml	   :  4; /* AP msg limit */
 			unsigned int	   :  3;
 			unsigned int qd	   :  5; /* queue depth */
 		};
diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c
index c86397f4ddcd..e9a8180f08c2 100644
--- a/drivers/s390/crypto/ap_card.c
+++ b/drivers/s390/crypto/ap_card.c
@@ -242,7 +242,8 @@ struct ap_card *ap_card_create(int id, struct ap_tapq_hwinfo hwinfo,
 	ac->hwinfo = hwinfo;
 	ac->id = id;
 	ac->maxmsgsize = hwinfo.ml > 3 ?
-		hwinfo.ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
+		hwinfo.ml * (hwinfo.mlm + 1) * AP_TAPQ_ML_FIELD_CHUNK_SIZE :
+		AP_DEFAULT_MAX_MSG_SIZE;
 
 	return ac;
 }
-- 
2.43.0