[src/trunk]: src/sys/dev/pci Remove dependency on bus_space_write_8() for i38...

[reinoud <reinoud%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5129a9920ae5
branches:  trunk
changeset: 958834:5129a9920ae5
user:      reinoud <reinoud%NetBSD.org@localhost>
date:      Thu Jan 21 20:48:33 2021 +0000

description:
Remove dependency on bus_space_write_8() for i386 and instead implement it as
two bus_space_write_4()'s as allowed in the spec.

diffstat:

 sys/dev/pci/virtio_pci.c |  25 +++++++++++++++++--------
 1 files changed, 17 insertions(+), 8 deletions(-)

diffs (63 lines):

diff -r 9755de50eab3 -r 5129a9920ae5 sys/dev/pci/virtio_pci.c
--- a/sys/dev/pci/virtio_pci.c  Thu Jan 21 19:37:23 2021 +0000
+++ b/sys/dev/pci/virtio_pci.c  Thu Jan 21 20:48:33 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: virtio_pci.c,v 1.17 2021/01/21 08:17:13 martin Exp $ */
+/* $NetBSD: virtio_pci.c,v 1.18 2021/01/21 20:48:33 reinoud Exp $ */
 
 /*
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -28,7 +28,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: virtio_pci.c,v 1.17 2021/01/21 08:17:13 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: virtio_pci.c,v 1.18 2021/01/21 20:48:33 reinoud Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -727,6 +727,14 @@
        return bus_space_read_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SIZE);
 }
 
+/*
+ * By definition little endian only in v1.0 and 8 byters are allowed to be
+ * written as two 4 byters
+ */
+#define bus_space_write_le_8(iot, ioh, reg, val) \
+       bus_space_write_4(iot, ioh, reg, ((uint64_t) (val)) & 0xffffffff); \
+       bus_space_write_4(iot, ioh, reg + 4, ((uint64_t) (val)) >> 32);
+
 static void
 virtio_pci_setup_queue_10(struct virtio_softc *sc, uint16_t idx, uint64_t addr)
 {
@@ -739,15 +747,15 @@
        bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SELECT, vq->vq_index);
        if (addr == 0) {
                bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_ENABLE, 0);
-               bus_space_write_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_DESC,   0);
-               bus_space_write_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_AVAIL,  0);
-               bus_space_write_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_USED,   0);
+               bus_space_write_le_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_DESC,   0);
+               bus_space_write_le_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_AVAIL,  0);
+               bus_space_write_le_8(iot, ioh, VIRTIO_CONFIG1_QUEUE_USED,   0);
        } else {
-               bus_space_write_8(iot, ioh,
+               bus_space_write_le_8(iot, ioh,
                        VIRTIO_CONFIG1_QUEUE_DESC, addr);
-               bus_space_write_8(iot, ioh,
+               bus_space_write_le_8(iot, ioh,
                        VIRTIO_CONFIG1_QUEUE_AVAIL, addr + vq->vq_availoffset);
-               bus_space_write_8(iot, ioh,
+               bus_space_write_le_8(iot, ioh,
                        VIRTIO_CONFIG1_QUEUE_USED, addr + vq->vq_usedoffset);
                bus_space_write_2(iot, ioh,
                        VIRTIO_CONFIG1_QUEUE_ENABLE, 1);
@@ -763,6 +771,7 @@
                        VIRTIO_CONFIG1_QUEUE_MSIX_VECTOR, vec);
        }
 }
+#undef bus_space_write_le_8
 
 static void
 virtio_pci_set_status_10(struct virtio_softc *sc, int status)