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Zero DMA memory after load, and add PREREAD sync op after to ensure it is visible

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jmcneill 2020-12-27 16:52:01 +00:00
parent 9524640e66
commit ca0bc97d2a
1 changed files with 5 additions and 3 deletions
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8
sys/dev/ic/nvme.c
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@ -1,4 +1,4 @@
/* $NetBSD: nvme.c,v 1.53 2020/12/04 23:03:11 kardel Exp $ */
/* $NetBSD: nvme.c,v 1.54 2020/12/27 16:52:01 jmcneill Exp $ */
/* $OpenBSD: nvme.c,v 1.49 2016/04/18 05:59:50 dlg Exp $ */
/*
@ -18,7 +18,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nvme.c,v 1.53 2020/12/04 23:03:11 kardel Exp $");
__KERNEL_RCSID(0, "$NetBSD: nvme.c,v 1.54 2020/12/27 16:52:01 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1925,12 +1925,14 @@ nvme_dmamem_alloc(struct nvme_softc *sc, size_t size)
if (bus_dmamem_map(sc->sc_dmat, &ndm->ndm_seg, nsegs, size,
&ndm->ndm_kva, BUS_DMA_WAITOK) != 0)
goto free;
memset(ndm->ndm_kva, 0, size);
if (bus_dmamap_load(sc->sc_dmat, ndm->ndm_map, ndm->ndm_kva, size,
NULL, BUS_DMA_WAITOK) != 0)
goto unmap;
memset(ndm->ndm_kva, 0, size);
bus_dmamap_sync(sc->sc_dmat, ndm->ndm_map, 0, size, BUS_DMASYNC_PREREAD);
return ndm;
unmap: