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sys/dev/virtio/block/virtio_blk.c
| Show First 20 Lines • Show All 391 Lines • ▼ Show 20 Lines | error = bus_dma_tag_create( | ||||
| busdma_lock_mutex, /* lockfunc */ | busdma_lock_mutex, /* lockfunc */ | ||||
| &sc->vtblk_mtx, /* lockarg */ | &sc->vtblk_mtx, /* lockarg */ | ||||
| &sc->vtblk_dmat); | &sc->vtblk_dmat); | ||||
| if (error) { | if (error) { | ||||
| device_printf(dev, "cannot create bus dma tag\n"); | device_printf(dev, "cannot create bus dma tag\n"); | ||||
| goto fail; | goto fail; | ||||
| } | } | ||||
| #ifdef __powerpc__ | |||||
| /* | |||||
| * Virtio uses physical addresses rather than bus addresses, so we | |||||
| * need to ask busdma to skip the iommu physical->bus mapping. At | |||||
| * present, this is only a thing on the powerpc architectures. | |||||
| */ | |||||
| bus_dma_tag_set_iommu(sc->vtblk_dmat, NULL, NULL); | |||||
| #endif | |||||
| error = vtblk_alloc_virtqueue(sc); | error = vtblk_alloc_virtqueue(sc); | ||||
| if (error) { | if (error) { | ||||
| device_printf(dev, "cannot allocate virtqueue\n"); | device_printf(dev, "cannot allocate virtqueue\n"); | ||||
| goto fail; | goto fail; | ||||
| } | } | ||||
| error = vtblk_request_prealloc(sc); | error = vtblk_request_prealloc(sc); | ||||
| if (error) { | if (error) { | ||||
| ▲ Show 20 Lines • Show All 657 Lines • ▼ Show 20 Lines | if ((sc->vtblk_flags & VTBLK_FLAG_BARRIER) == 0) { | ||||
| } | } | ||||
| } | } | ||||
| sglist_reset(sg); | sglist_reset(sg); | ||||
| sglist_append(sg, &req->vbr_hdr, sizeof(struct virtio_blk_outhdr)); | sglist_append(sg, &req->vbr_hdr, sizeof(struct virtio_blk_outhdr)); | ||||
| if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { | if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { | ||||
| /* | /* | ||||
| * We cast bus_addr_t to vm_paddr_t here; this isn't valid on | * We cast bus_addr_t to vm_paddr_t here; since we skip the | ||||
| * all platforms, but we believe it works on all platforms | * iommu mapping (see vtblk_attach) this should be safe. | ||||
| * which are supported by virtio. | |||||
| */ | */ | ||||
| for (i = 0; i < nseg; i++) { | for (i = 0; i < nseg; i++) { | ||||
| error = sglist_append_phys(sg, | error = sglist_append_phys(sg, | ||||
| (vm_paddr_t)segs[i].ds_addr, segs[i].ds_len); | (vm_paddr_t)segs[i].ds_addr, segs[i].ds_len); | ||||
| if (error || sg->sg_nseg == sg->sg_maxseg) { | if (error || sg->sg_nseg == sg->sg_maxseg) { | ||||
| panic("%s: bio %p data buffer too big %d", | panic("%s: bio %p data buffer too big %d", | ||||
| __func__, bp, error); | __func__, bp, error); | ||||
| } | } | ||||
| ▲ Show 20 Lines • Show All 567 Lines • Show Last 20 Lines | |||||