From: Halil Pasic <pasic@linux.ibm.com>
Date: Tue, 14 Dec 2021 15:54:16 +0100
Subject: s390/airq: use DMA memory for summary indicators
Git-commit: 9d792ef17f18734bca823910b89254dec37b50c5
Patch-mainline: v5.18-rc1
References: jsc#PED-596

Protected virtualization guests have to use shared pages for airq
notifier bit vectors and summary bytes or bits, thus these need to be
allocated as DMA coherent memory.  Commit b50623e5db80 ("s390/airq: use
DMA memory for adapter interrupts")  took care of the notifier bit
vectors, but omitted to take care of the summary bytes/bits.

In practice this omission is not a big deal, because the summary ain't
necessarily allocated here, but can be supplied by the driver. Currently
all the I/O we have for SE guests is virtio-ccw, and  virtio-ccw uses a
self-allocated array of summary indicators.

Let us cover all our bases nevertheless!

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/cio/airq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/s390/cio/airq.c
+++ b/drivers/s390/cio/airq.c
@@ -44,7 +44,7 @@ int register_adapter_interrupt(struct ai
 	if (!airq->handler || airq->isc > MAX_ISC)
 		return -EINVAL;
 	if (!airq->lsi_ptr) {
-		airq->lsi_ptr = kzalloc(1, GFP_KERNEL);
+		airq->lsi_ptr = cio_dma_zalloc(1);
 		if (!airq->lsi_ptr)
 			return -ENOMEM;
 		airq->flags |= AIRQ_PTR_ALLOCATED;
@@ -79,7 +79,7 @@ void unregister_adapter_interrupt(struct
 	synchronize_rcu();
 	isc_unregister(airq->isc);
 	if (airq->flags & AIRQ_PTR_ALLOCATED) {
-		kfree(airq->lsi_ptr);
+		cio_dma_free(airq->lsi_ptr, 1);
 		airq->lsi_ptr = NULL;
 		airq->flags &= ~AIRQ_PTR_ALLOCATED;
 	}