C++ (Cpp) _bus_dmamap_load_phys Examples

Example #1

File: subr_bus_dma.c Project: rchander/freebsd

/*
 * Load a cam control block.
 */
static int
_bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
                     int *nsegs, int flags)
{
    struct ccb_hdr *ccb_h;
    void *data_ptr;
    int error;
    uint32_t dxfer_len;
    uint16_t sglist_cnt;

    error = 0;
    ccb_h = &ccb->ccb_h;
    switch (ccb_h->func_code) {
    case XPT_SCSI_IO: {
        struct ccb_scsiio *csio;

        csio = &ccb->csio;
        data_ptr = csio->data_ptr;
        dxfer_len = csio->dxfer_len;
        sglist_cnt = csio->sglist_cnt;
        break;
    }
    case XPT_CONT_TARGET_IO: {
        struct ccb_scsiio *ctio;

        ctio = &ccb->ctio;
        data_ptr = ctio->data_ptr;
        dxfer_len = ctio->dxfer_len;
        sglist_cnt = ctio->sglist_cnt;
        break;
    }
    case XPT_ATA_IO: {
        struct ccb_ataio *ataio;

        ataio = &ccb->ataio;
        data_ptr = ataio->data_ptr;
        dxfer_len = ataio->dxfer_len;
        sglist_cnt = 0;
        break;
    }
    default:
        panic("_bus_dmamap_load_ccb: Unsupported func code %d",
              ccb_h->func_code);
    }

    switch ((ccb_h->flags & CAM_DATA_MASK)) {
    case CAM_DATA_VADDR:
        error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
                                        kernel_pmap, flags, NULL, nsegs);
        break;
    case CAM_DATA_PADDR:
        error = _bus_dmamap_load_phys(dmat, map,
                                      (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
                                      nsegs);
        break;
    case CAM_DATA_SG:
        error = _bus_dmamap_load_vlist(dmat, map,
                                       (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
                                       nsegs, flags);
        break;
    case CAM_DATA_SG_PADDR:
        error = _bus_dmamap_load_plist(dmat, map,
                                       (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
        break;
    case CAM_DATA_BIO:
        error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
                                     nsegs, flags);
        break;
    default:
        panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
              ccb_h->flags);
    }
    return (error);
}

Example #2

int
bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
    struct memdesc *mem, bus_dmamap_callback_t *callback,
    void *callback_arg, int flags)
{
	bus_dma_segment_t *segs;
	int error;
	int nsegs;

	if ((flags & BUS_DMA_NOWAIT) == 0)
		_bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);

	nsegs = -1;
	error = 0;
	switch (mem->md_type) {
	case MEMDESC_VADDR:
		error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
		    mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
		break;
	case MEMDESC_PADDR:
		error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
		    mem->md_opaque, flags, NULL, &nsegs);
		break;
	case MEMDESC_VLIST:
		error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
		    mem->md_opaque, kernel_pmap, &nsegs, flags);
		break;
	case MEMDESC_PLIST:
		error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
		    mem->md_opaque, &nsegs, flags);
		break;
	case MEMDESC_BIO:
		error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
		    &nsegs, flags);
		break;
	case MEMDESC_UIO:
		error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
		    &nsegs, flags);
		break;
	case MEMDESC_MBUF:
		error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
		    NULL, &nsegs, flags);
		break;
	case MEMDESC_CCB:
		error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
		    flags);
		break;
	}
	nsegs++;

	CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
	    __func__, dmat, flags, error, nsegs);

	if (error == EINPROGRESS)
		return (error);

	segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
	if (error)
		(*callback)(callback_arg, segs, 0, error);
	else
		(*callback)(callback_arg, segs, nsegs, 0);

	/*
	 * Return ENOMEM to the caller so that it can pass it up the stack.
	 * This error only happens when NOWAIT is set, so deferral is disabled.
	 */
	if (error == ENOMEM)
		return (error);

	return (0);
}