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linux/drivers/s390/crypto
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Harald Freudenberger e01f18c5af s390/ap: Fix wrong APQN fill calculation 
commit 3317785a88 upstream.

The upper limit of the firmware queue fill state for each APQN
is reported by the hwinfo.qd field. This field shows the
numbers 0-7 for 1-8 queue spaces available. But the exploiting
code assumed the real boundary is stored there and thus stoppes
queuing in messages one tick too early.

Correct the limit calculation and thus offer a boost
of 12.5% performance for high traffic on one APQN.

Fixes: d4c53ae8e4 ("s390/ap: store TAPQ hwinfo in struct ap_card")
Cc: stable@vger.kernel.org
Reported-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-01-30 10:28:46 +01:00
..
ap_bus.c s390/ap: Don't leak debug feature files if AP instructions are not available 2025-12-18 13:54:47 +01:00
ap_bus.h s390/ap: Unmask SLCF bit in card and queue ap functions sysfs 2025-08-15 12:14:05 +02:00
ap_card.c s390/ap: Fix wrong APQN fill calculation 2026-01-30 10:28:46 +01:00
ap_debug.h s390/zcrypt: introduce dynamic debugging for AP and zcrypt code 2024-02-16 14:30:12 +01:00
ap_queue.c s390/ap: Fix wrong APQN fill calculation 2026-01-30 10:28:46 +01:00
Makefile s390/pkey: Introduce pkey base with handler registry and handler modules 2024-08-29 22:56:34 +02:00
pkey_api.c s390/pkey: Prevent overflow in size calculation for memdup_user() 2025-07-06 11:01:38 +02:00
pkey_base.c s390/pkey: Add function to enforce pkey handler modules load 2024-08-29 22:56:34 +02:00
pkey_base.h s390/pkey: Add AES xts and HMAC clear key token support 2024-09-05 15:17:23 +02:00
pkey_cca.c s390/pkey: Add slowpath function to CCA and EP11 handler 2024-08-29 22:56:34 +02:00
pkey_ep11.c s390/pkey: Add slowpath function to CCA and EP11 handler 2024-08-29 22:56:34 +02:00
pkey_pckmo.c s390/pkey_pckmo: Return with success for valid protected key types 2024-10-16 11:32:32 +02:00
pkey_sysfs.c s390/pkey: Add AES xts and HMAC clear key token support 2024-09-05 15:17:23 +02:00
vfio_ap_debug.h s390-vfio-ap: introduces s390 kernel debug feature for vfio_ap device driver 2022-02-06 23:31:29 +01:00
vfio_ap_drv.c s390/vfio-ap: Driver feature advertisement 2024-09-23 17:57:04 +02:00
vfio_ap_ops.c s390/vfio-ap: Fix no AP queue sharing allowed message written to kernel log 2025-05-29 11:02:02 +02:00
vfio_ap_private.h s390/vfio-ap: Add write support to sysfs attr ap_config 2024-04-22 12:49:17 +02:00
zcrypt_api.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
zcrypt_api.h s390/zcrypt: improve zcrypt retry behavior 2024-03-07 14:41:15 +01:00
zcrypt_card.c s390/zcrypt: don't report online if card or queue is in check-stop state 2023-11-05 22:34:57 +01:00
zcrypt_cca_key.h s390/zcrypt: rework arrays with length zero occurrences 2023-04-19 16:47:31 +02:00
zcrypt_ccamisc.c s390/pkey: Rework and split PKEY kernel module code 2024-08-29 22:56:33 +02:00
zcrypt_ccamisc.h s390/pkey: Rework and split PKEY kernel module code 2024-08-29 22:56:33 +02:00
zcrypt_cex2a.c s390/zcrypt: remove CEX2 and CEX3 device drivers 2023-07-24 12:12:22 +02:00
zcrypt_cex2a.h s390/zcrypt: remove CEX2 and CEX3 device drivers 2023-07-24 12:12:22 +02:00
zcrypt_cex2c.c s390/zcrypt: remove CEX2 and CEX3 device drivers 2023-07-24 12:12:22 +02:00
zcrypt_cex2c.h s390/zcrypt: remove CEX2 and CEX3 device drivers 2023-07-24 12:12:22 +02:00
zcrypt_cex4.c s390/ap: store TAPQ hwinfo in struct ap_card 2023-11-30 16:24:23 +01:00
zcrypt_cex4.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
zcrypt_debug.h s390/zcrypt: introduce dynamic debugging for AP and zcrypt code 2024-02-16 14:30:12 +01:00
zcrypt_ep11misc.c s390/pkey: Rework and split PKEY kernel module code 2024-08-29 22:56:33 +02:00
zcrypt_ep11misc.h s390/pkey: Rework and split PKEY kernel module code 2024-08-29 22:56:33 +02:00
zcrypt_error.h s390/zcrypt: improve zcrypt retry behavior 2024-03-07 14:41:15 +01:00
zcrypt_msgtype6.c s390/zcrypt_msgtype6: Cleanup debug code 2024-08-21 16:17:01 +02:00
zcrypt_msgtype6.h s390/zcrypt: code cleanup 2022-04-25 13:54:14 +02:00
zcrypt_msgtype50.c s390/zcrypt_msgtype50: Cleanup debug code 2024-08-21 16:17:01 +02:00
zcrypt_msgtype50.h s390/zcrypt: remove CEX2 and CEX3 device drivers 2023-07-24 12:12:22 +02:00
zcrypt_queue.c s390/zcrypt: don't report online if card or queue is in check-stop state 2023-11-05 22:34:57 +01:00