git: 795a9974144e - main - Hyper-V: storvsc: Call bus_dmamap_sync() for dma operations

The branch main has been updated by whu:

URL: https://cgit.FreeBSD.org/src/commit/?id=795a9974144ec26f93a9081f72e09a2814ac3e4c

commit 795a9974144ec26f93a9081f72e09a2814ac3e4c
Author:     Wei Hu <whu@FreeBSD.org>
AuthorDate: 2022-08-15 06:56:01 +0000
Commit:     Wei Hu <whu@FreeBSD.org>
CommitDate: 2022-08-15 07:05:43 +0000

    Hyper-V: storvsc: Call bus_dmamap_sync() for dma operations
    
    Call bus_dmamap_sync() for related dma operations. This is required
    on ARM64 architecture.
    
    Tested by:      Souradeep Chakrabarti <schakrabarti@microsoft.com>
    MFC after:      2 weeks
    Sponsored by:   Microsoft
---
 sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c b/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c
index 2e2ecf3dd228..4c9869887db6 100644
--- a/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c
+++ b/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c
@@ -1853,6 +1853,18 @@ storvsc_xferbuf_prepare(void *arg, bus_dma_segment_t *segs, int nsegs, int error
 		prplist->gpa_page[i] = atop(segs[i].ds_addr);
 	}
 	reqp->prp_cnt = nsegs;
+
+	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
+		bus_dmasync_op_t op;
+
+		if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
+			op = BUS_DMASYNC_PREREAD;
+		else
+			op = BUS_DMASYNC_PREWRITE;
+
+		bus_dmamap_sync(reqp->softc->storvsc_req_dtag,
+		    reqp->data_dmap, op);
+	}
 }
 
 /**
@@ -2113,6 +2125,19 @@ storvsc_io_done(struct hv_storvsc_request *reqp)
 	int ori_sg_count = 0;
 	const struct scsi_generic *cmd;
 
+	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
+		bus_dmasync_op_t op;
+
+		if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
+			op = BUS_DMASYNC_POSTREAD;
+		else
+			op = BUS_DMASYNC_POSTWRITE;
+
+		bus_dmamap_sync(reqp->softc->storvsc_req_dtag,
+		    reqp->data_dmap, op);
+		bus_dmamap_unload(sc->storvsc_req_dtag, reqp->data_dmap);
+	}
+
 	/* destroy bounce buffer if it is used */
 	if (reqp->bounce_sgl_count) {
 		ori_sglist = (bus_dma_segment_t *)ccb->csio.data_ptr;