Reform the busdma API so that new types may be added without modifying

every architecture's busdma_machdep.c.  It is done by unifying the
bus_dmamap_load_buffer() routines so that they may be called from MI
code.  The MD busdma is then given a chance to do any final processing
in the complete() callback.

The cam changes unify the bus_dmamap_load* handling in cam drivers.

The arm and mips implementations are updated to track virtual
addresses for sync().  Previously this was done in a type specific
way.  Now it is done in a generic way by recording the list of
virtuals in the map.

Submitted by:	jeff (sponsored by EMC/Isilon)
Reviewed by:	kan (previous version), scottl,
	mjacob (isp(4), no objections for target mode changes)
Discussed with:	     ian (arm changes)
Tested by:	marius (sparc64), mips (jmallet), isci(4) on x86 (jharris),
	amd64 (Fabian Keil <freebsd-listen@fabiankeil.de>)

46 files changed, 487 insertions, 1433 deletions

diff --git a/sys/dev/aac/aac_cam.c b/sys/dev/aac/aac_cam.c
index 57e87da..7f0d7ee 100644
--- a/sys/dev/aac/aac_cam.c
+++ b/sys/dev/aac/aac_cam.c
@@ -448,26 +448,28 @@ aac_cam_action(struct cam_sim *sim, union ccb *ccb)
 
 		/* Map the s/g list. XXX 32bit addresses only! */
 		if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
+			switch ((ccb->ccb_h.flags & CAM_DATA_MASK)) {
+			case CAM_DATA_VADDR:
 				srb->data_len = csio->dxfer_len;
-				if (ccb->ccb_h.flags & CAM_DATA_PHYS) {
-					/* Send a 32bit command */
-					fib->Header.Command = ScsiPortCommand;
-					srb->sg_map.SgCount = 1;
-					srb->sg_map.SgEntry[0].SgAddress =
-					    (uint32_t)(uintptr_t)csio->data_ptr;
-					srb->sg_map.SgEntry[0].SgByteCount =
-					    csio->dxfer_len;
-				} else {
-					/*
-					 * Arrange things so that the S/G
-					 * map will get set up automagically
-					 */
-					cm->cm_data = (void *)csio->data_ptr;
-					cm->cm_datalen = csio->dxfer_len;
-					cm->cm_sgtable = &srb->sg_map;
-				}
-			} else {
+				/*
+				 * Arrange things so that the S/G
+				 * map will get set up automagically
+				 */
+				cm->cm_data = (void *)csio->data_ptr;
+				cm->cm_datalen = csio->dxfer_len;
+				cm->cm_sgtable = &srb->sg_map;
+				break;
+			case CAM_DATA_PADDR:
+				/* Send a 32bit command */
+				fib->Header.Command = ScsiPortCommand;
+				srb->sg_map.SgCount = 1;
+				srb->sg_map.SgEntry[0].SgAddress =
+				    (uint32_t)(uintptr_t)csio->data_ptr;
+				srb->sg_map.SgEntry[0].SgByteCount =
+				    csio->dxfer_len;
+				srb->data_len = csio->dxfer_len;
+				break;
+			default:
 				/* XXX Need to handle multiple s/g elements */
 				panic("aac_cam: multiple s/g elements");
 			}
diff --git a/sys/dev/advansys/advansys.c b/sys/dev/advansys/advansys.c
index d804b6d..c9ccb67 100644
--- a/sys/dev/advansys/advansys.c
+++ b/sys/dev/advansys/advansys.c
@@ -207,6 +207,7 @@ adv_action(struct cam_sim *sim, union ccb *ccb)
 		struct	ccb_hdr *ccb_h;
 		struct	ccb_scsiio *csio;
 		struct	adv_ccb_info *cinfo;
+		int error;
 
 		ccb_h = &ccb->ccb_h;
 		csio = &ccb->csio;
@@ -217,58 +218,17 @@ adv_action(struct cam_sim *sim, union ccb *ccb)
 		ccb_h->ccb_cinfo_ptr = cinfo;
 		cinfo->ccb = ccb;
 
-		/* Only use S/G if there is a transfer */
-		if ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if ((ccb_h->flags & CAM_SCATTER_VALID) == 0) {
-				/*
-				 * We've been given a pointer
-				 * to a single buffer
-				 */
-				if ((ccb_h->flags & CAM_DATA_PHYS) == 0) {
-					int error;
-
-					error =
-					    bus_dmamap_load(adv->buffer_dmat,
-							    cinfo->dmamap,
-							    csio->data_ptr,
-							    csio->dxfer_len,
-							    adv_execute_ccb,
-							    csio, /*flags*/0);
-					if (error == EINPROGRESS) {
-						/*
-						 * So as to maintain ordering,
-						 * freeze the controller queue
-						 * until our mapping is
-						 * returned.
-						 */
-						adv_set_state(adv,
-							      ADV_BUSDMA_BLOCK);
-					}
-				} else {
-					struct bus_dma_segment seg;
-
-					/* Pointer to physical buffer */
-					seg.ds_addr =
-					     (bus_addr_t)csio->data_ptr;
-					seg.ds_len = csio->dxfer_len;
-					adv_execute_ccb(csio, &seg, 1, 0);
-				}
-			} else {
-				struct bus_dma_segment *segs;
-				if ((ccb_h->flags & CAM_DATA_PHYS) != 0)
-					panic("adv_setup_data - Physical "
-					      "segment pointers unsupported");
-
-				if ((ccb_h->flags & CAM_SG_LIST_PHYS) == 0)
-					panic("adv_setup_data - Virtual "
-					      "segment addresses unsupported");
-
-				/* Just use the segments provided */
-				segs = (struct bus_dma_segment *)csio->data_ptr;
-				adv_execute_ccb(ccb, segs, csio->sglist_cnt, 0);
-			}
-		} else {
-			adv_execute_ccb(ccb, NULL, 0, 0);
+		error = bus_dmamap_load_ccb(adv->buffer_dmat,
+					    cinfo->dmamap,
+					    ccb,
+					    adv_execute_ccb,
+					    csio, /*flags*/0);
+		if (error == EINPROGRESS) {
+			/*
+			 * So as to maintain ordering, freeze the controller
+			 * queue until our mapping is returned.
+			 */
+			adv_set_state(adv, ADV_BUSDMA_BLOCK);
 		}
 		break;
 	}
diff --git a/sys/dev/advansys/adwcam.c b/sys/dev/advansys/adwcam.c
index defc7c7..de1f413 100644
--- a/sys/dev/advansys/adwcam.c
+++ b/sys/dev/advansys/adwcam.c
@@ -353,6 +353,7 @@ adw_action(struct cam_sim *sim, union ccb *ccb)
 		struct	ccb_scsiio *csio;
 		struct	ccb_hdr *ccbh;
 		struct	acb *acb;
+		int error;
 
 		csio = &ccb->csio;
 		ccbh = &ccb->ccb_h;
@@ -427,66 +428,18 @@ adw_action(struct cam_sim *sim, union ccb *ccb)
 			      acb->queue.cdb, csio->cdb_len);
 		}
 
-		/*
-		 * If we have any data to send with this command,
-		 * map it into bus space.
-		 */
-		if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
-				/*
-				 * We've been given a pointer
-				 * to a single buffer.
-				 */
-				if ((ccbh->flags & CAM_DATA_PHYS) == 0) {
-					int error;
-
-					error =
-					    bus_dmamap_load(adw->buffer_dmat,
-							    acb->dmamap,
-							    csio->data_ptr,
-							    csio->dxfer_len,
-							    adwexecuteacb,
-							    acb, /*flags*/0);
-					if (error == EINPROGRESS) {
-						/*
-						 * So as to maintain ordering,
-						 * freeze the controller queue
-						 * until our mapping is
-						 * returned.
-						 */
-						xpt_freeze_simq(sim, 1);
-						acb->state |= CAM_RELEASE_SIMQ;
-					}
-				} else {
-					struct bus_dma_segment seg; 
-
-					/* Pointer to physical buffer */
-					seg.ds_addr =
-					    (bus_addr_t)csio->data_ptr;
-					seg.ds_len = csio->dxfer_len;
-					adwexecuteacb(acb, &seg, 1, 0);
-				}
-			} else {
-				struct bus_dma_segment *segs;
-
-				if ((ccbh->flags & CAM_DATA_PHYS) != 0)
-					panic("adw_action - Physical "
-					      "segment pointers "
-					      "unsupported");
-
-				if ((ccbh->flags&CAM_SG_LIST_PHYS)==0)
-					panic("adw_action - Virtual "
-					      "segment addresses "
-					      "unsupported");
-
-				/* Just use the segments provided */
-				segs = (struct bus_dma_segment *)csio->data_ptr;
-				adwexecuteacb(acb, segs, csio->sglist_cnt,
-					      (csio->sglist_cnt < ADW_SGSIZE)
-					      ? 0 : EFBIG);
-			}
-		} else {
-			adwexecuteacb(acb, NULL, 0, 0);
+		error = bus_dmamap_load_ccb(adw->buffer_dmat,
+					    acb->dmamap,
+					    ccb,
+					    adwexecuteacb,
+					    acb, /*flags*/0);
+		if (error == EINPROGRESS) {
+			/*
+			 * So as to maintain ordering, freeze the controller
+			 * queue until our mapping is returned.
+			 */
+			xpt_freeze_simq(sim, 1);
+			acb->state |= CAM_RELEASE_SIMQ;
 		}
 		break;
 	}
diff --git a/sys/dev/aha/aha.c b/sys/dev/aha/aha.c
index 07b0682..ab2a59a 100644
--- a/sys/dev/aha/aha.c
+++ b/sys/dev/aha/aha.c
@@ -778,6 +778,7 @@ ahaaction(struct cam_sim *sim, union ccb *ccb)
 		if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
 			struct ccb_scsiio *csio;
 			struct ccb_hdr *ccbh;
+			int error;
 
 			csio = &ccb->csio;
 			ccbh = &csio->ccb_h;
@@ -811,67 +812,22 @@ ahaaction(struct cam_sim *sim, union ccb *ccb)
 			 * If we have any data to send with this command,
 			 * map it into bus space.
 			 */
-		        /* Only use S/G if there is a transfer */
-			if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-				if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
-					/*
-					 * We've been given a pointer
-					 * to a single buffer.
-					 */
-					if ((ccbh->flags & CAM_DATA_PHYS)==0) {
-						int error;
-
-						error = bus_dmamap_load(
-						    aha->buffer_dmat,
-						    accb->dmamap,
-						    csio->data_ptr,
-						    csio->dxfer_len,
-						    ahaexecuteccb,
-						    accb,
-						    /*flags*/0);
-						if (error == EINPROGRESS) {
-							/*
-							 * So as to maintain
-							 * ordering, freeze the
-							 * controller queue
-							 * until our mapping is
-							 * returned.
-							 */
-							xpt_freeze_simq(aha->sim,
-									1);
-							csio->ccb_h.status |=
-							    CAM_RELEASE_SIMQ;
-						}
-					} else {
-						struct bus_dma_segment seg;
-
-						/* Pointer to physical buffer */
-						seg.ds_addr =
-						    (bus_addr_t)csio->data_ptr;
-						seg.ds_len = csio->dxfer_len;
-						ahaexecuteccb(accb, &seg, 1, 0);
-					}
-				} else {
-					struct bus_dma_segment *segs;
-
-					if ((ccbh->flags & CAM_DATA_PHYS) != 0)
-						panic("ahaaction - Physical "
-						      "segment pointers "
-						      "unsupported");
-
-					if ((ccbh->flags&CAM_SG_LIST_PHYS)==0)
-						panic("ahaaction - Virtual "
-						      "segment addresses "
-						      "unsupported");
-
-					/* Just use the segments provided */
-					segs = (struct bus_dma_segment *)
-					    csio->data_ptr;
-					ahaexecuteccb(accb, segs,
-						     csio->sglist_cnt, 0);
-				}
-			} else {
-				ahaexecuteccb(accb, NULL, 0, 0);
+
+			error = bus_dmamap_load_ccb(
+			    aha->buffer_dmat,
+			    accb->dmamap,
+			    ccb,
+			    ahaexecuteccb,
+			    accb,
+			    /*flags*/0);
+			if (error == EINPROGRESS) {
+				/*
+				 * So as to maintain ordering, freeze the
+				 * controller queue until our mapping is
+				 * returned.
+				 */
+				xpt_freeze_simq(aha->sim, 1);
+				csio->ccb_h.status |= CAM_RELEASE_SIMQ;
 			}
 		} else {
 			hccb->opcode = INITIATOR_BUS_DEV_RESET;
diff --git a/sys/dev/ahb/ahb.c b/sys/dev/ahb/ahb.c
index b0b4db2..fd07c44 100644
--- a/sys/dev/ahb/ahb.c
+++ b/sys/dev/ahb/ahb.c
@@ -1006,6 +1006,7 @@ ahbaction(struct cam_sim *sim, union ccb *ccb)
 	{
 		struct ecb *ecb;
 		struct hardware_ecb *hecb;
+		int error;
 
 		/*
 		 * get an ecb to use.
@@ -1056,65 +1057,19 @@ ahbaction(struct cam_sim *sim, union ccb *ccb)
 			      hecb->cdb, hecb->cdb_len);
 		}
 
-		/*
-		 * If we have any data to send with this command,
-		 * map it into bus space.
-		 */
-		if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
-				/*
-				 * We've been given a pointer
-				 * to a single buffer.
-				 */
-				if ((ccb->ccb_h.flags & CAM_DATA_PHYS)==0) {
-					int error;
-
-					error = bus_dmamap_load(
-					    ahb->buffer_dmat,
-					    ecb->dmamap,
-					    ccb->csio.data_ptr,
-					    ccb->csio.dxfer_len,
-					    ahbexecuteecb,
-					    ecb, /*flags*/0);
-					if (error == EINPROGRESS) {
-						/*
-						 * So as to maintain ordering,
-						 * freeze the controller queue
-						 * until our mapping is
-						 * returned.
-						 */
-						xpt_freeze_simq(ahb->sim, 1);
-						ccb->ccb_h.status |=
-						    CAM_RELEASE_SIMQ;
-					}
-				} else {
-					struct bus_dma_segment seg; 
-
-					/* Pointer to physical buffer */
-					seg.ds_addr =
-					    (bus_addr_t)ccb->csio.data_ptr;
-					seg.ds_len = ccb->csio.dxfer_len;
-					ahbexecuteecb(ecb, &seg, 1, 0);
-				}
-			} else {
-				struct bus_dma_segment *segs;
-
-				if ((ccb->ccb_h.flags & CAM_DATA_PHYS) != 0)
-					panic("ahbaction - Physical segment "
-					      "pointers unsupported");
-
-				if ((ccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0)
-					panic("btaction - Virtual segment "
-					      "addresses unsupported");
-
-				/* Just use the segments provided */
-				segs = (struct bus_dma_segment *)
-				    ccb->csio.data_ptr;
-				ahbexecuteecb(ecb, segs, ccb->csio.sglist_cnt,
-					     0);
-			}
-		} else {
-			ahbexecuteecb(ecb, NULL, 0, 0);
+		error = bus_dmamap_load_ccb(
+		    ahb->buffer_dmat,
+		    ecb->dmamap,
+		    ccb,
+		    ahbexecuteecb,
+		    ecb, /*flags*/0);
+		if (error == EINPROGRESS) {
+			/*
+			 * So as to maintain ordering, freeze the controller
+			 * queue until our mapping is returned.
+			 */
+			xpt_freeze_simq(ahb->sim, 1);
+			ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
 		}
 		break;
 	}
diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index b17b9f3..8e692bd 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -1683,21 +1683,10 @@ ahci_begin_transaction(device_t dev, union ccb *ccb)
 	    (ccb->ataio.cmd.flags & (CAM_ATAIO_CONTROL | CAM_ATAIO_NEEDRESULT)))
 		ch->aslots |= (1 << slot->slot);
 	slot->dma.nsegs = 0;
-	/* If request moves data, setup and load SG list */
 	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		void *buf;
-		bus_size_t size;
-
 		slot->state = AHCI_SLOT_LOADING;
-		if (ccb->ccb_h.func_code == XPT_ATA_IO) {
-			buf = ccb->ataio.data_ptr;
-			size = ccb->ataio.dxfer_len;
-		} else {
-			buf = ccb->csio.data_ptr;
-			size = ccb->csio.dxfer_len;
-		}
-		bus_dmamap_load(ch->dma.data_tag, slot->dma.data_map,
-		    buf, size, ahci_dmasetprd, slot, 0);
+		bus_dmamap_load_ccb(ch->dma.data_tag, slot->dma.data_map, ccb,
+		    ahci_dmasetprd, slot, 0);
 	} else
 		ahci_execute_transaction(slot);
 }
diff --git a/sys/dev/aic/aic.c b/sys/dev/aic/aic.c
index d83df32..d751b4d 100644
--- a/sys/dev/aic/aic.c
+++ b/sys/dev/aic/aic.c
@@ -146,8 +146,8 @@ aic_action(struct cam_sim *sim, union ccb *ccb)
 				scb->cmd_ptr = ccb->csio.cdb_io.cdb_bytes;
 			}
 			if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-				if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) ||
-				    (ccb->ccb_h.flags & CAM_DATA_PHYS)) {
+				if ((ccb->ccb_h.flags & CAM_DATA_MASK) !=
+				    CAM_DATA_VADDR) {
 					ccb->ccb_h.status = CAM_REQ_INVALID;
 					aic_free_scb(aic, scb);
 					xpt_done(ccb);
diff --git a/sys/dev/aic7xxx/aic79xx_osm.c b/sys/dev/aic7xxx/aic79xx_osm.c
index 3f7b818..6ef0f92 100644
--- a/sys/dev/aic7xxx/aic79xx_osm.c
+++ b/sys/dev/aic7xxx/aic79xx_osm.c
@@ -1071,6 +1071,7 @@ ahd_setup_data(struct ahd_softc *ahd, struct cam_sim *sim,
 {
 	struct hardware_scb *hscb;
 	struct ccb_hdr *ccb_h;
+	int error;
 	
 	hscb = scb->hscb;
 	ccb_h = &csio->ccb_h;
@@ -1120,64 +1121,18 @@ ahd_setup_data(struct ahd_softc *ahd, struct cam_sim *sim,
 		}
 	}
 		
-	/* Only use S/G if there is a transfer */
-	if ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		if ((ccb_h->flags & CAM_SCATTER_VALID) == 0) {
-			/* We've been given a pointer to a single buffer */
-			if ((ccb_h->flags & CAM_DATA_PHYS) == 0) {
-				int s;
-				int error;
-
-				s = splsoftvm();
-				error = bus_dmamap_load(ahd->buffer_dmat,
-							scb->dmamap,
-							csio->data_ptr,
-							csio->dxfer_len,
-							ahd_execute_scb,
-							scb, /*flags*/0);
-				if (error == EINPROGRESS) {
-					/*
-					 * So as to maintain ordering,
-					 * freeze the controller queue
-					 * until our mapping is
-					 * returned.
-					 */
-					xpt_freeze_simq(sim,
-							/*count*/1);
-					scb->io_ctx->ccb_h.status |=
-					    CAM_RELEASE_SIMQ;
-				}
-				splx(s);
-			} else {
-				struct bus_dma_segment seg;
-
-				/* Pointer to physical buffer */
-				if (csio->dxfer_len > AHD_MAXTRANSFER_SIZE)
-					panic("ahd_setup_data - Transfer size "
-					      "larger than can device max");
-
-				seg.ds_addr =
-				    (bus_addr_t)(vm_offset_t)csio->data_ptr;
-				seg.ds_len = csio->dxfer_len;
-				ahd_execute_scb(scb, &seg, 1, 0);
-			}
-		} else {
-			struct bus_dma_segment *segs;
-
-			if ((ccb_h->flags & CAM_DATA_PHYS) != 0)
-				panic("ahd_setup_data - Physical segment "
-				      "pointers unsupported");
-
-			if ((ccb_h->flags & CAM_SG_LIST_PHYS) == 0)
-				panic("ahd_setup_data - Virtual segment "
-				      "addresses unsupported");
-
-			/* Just use the segments provided */
-			segs = (struct bus_dma_segment *)csio->data_ptr;
-			ahd_execute_scb(scb, segs, csio->sglist_cnt, 0);
-		}
-	} else {
-		ahd_execute_scb(scb, NULL, 0, 0);
+	error = bus_dmamap_load_ccb(ahd->buffer_dmat,
+				    scb->dmamap,
+				    (union ccb *)csio,
+				    ahd_execute_scb,
+				    scb, /*flags*/0);
+	if (error == EINPROGRESS) {
+		/*
+		 * So as to maintain ordering, freeze the controller queue
+		 * until our mapping is returned.
+		 */
+		xpt_freeze_simq(sim, /*count*/1);
+		scb->io_ctx->ccb_h.status |= CAM_RELEASE_SIMQ;
 	}
 }
 
diff --git a/sys/dev/aic7xxx/aic7xxx_osm.c b/sys/dev/aic7xxx/aic7xxx_osm.c
index 281b00e..a51177c9 100644
--- a/sys/dev/aic7xxx/aic7xxx_osm.c
+++ b/sys/dev/aic7xxx/aic7xxx_osm.c
@@ -1138,6 +1138,7 @@ ahc_setup_data(struct ahc_softc *ahc, struct cam_sim *sim,
 {
 	struct hardware_scb *hscb;
 	struct ccb_hdr *ccb_h;
+	int error;
 	
 	hscb = scb->hscb;
 	ccb_h = &csio->ccb_h;
@@ -1179,64 +1180,21 @@ ahc_setup_data(struct ahc_softc *ahc, struct cam_sim *sim,
 		}
 	}
 		
-	/* Only use S/G if there is a transfer */
-	if ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		if ((ccb_h->flags & CAM_SCATTER_VALID) == 0) {
-			/* We've been given a pointer to a single buffer */
-			if ((ccb_h->flags & CAM_DATA_PHYS) == 0) {
-				int s;
-				int error;
-
-				s = splsoftvm();
-				error = bus_dmamap_load(ahc->buffer_dmat,
-							scb->dmamap,
-							csio->data_ptr,
-							csio->dxfer_len,
-							ahc_execute_scb,
-							scb, /*flags*/0);
-				if (error == EINPROGRESS) {
-					/*
-					 * So as to maintain ordering,
-					 * freeze the controller queue
-					 * until our mapping is
-					 * returned.
-					 */
-					xpt_freeze_simq(sim,
-							/*count*/1);
-					scb->io_ctx->ccb_h.status |=
-					    CAM_RELEASE_SIMQ;
-				}
-				splx(s);
-			} else {
-				struct bus_dma_segment seg;
-
-				/* Pointer to physical buffer */
-				if (csio->dxfer_len > AHC_MAXTRANSFER_SIZE)
-					panic("ahc_setup_data - Transfer size "
-					      "larger than can device max");
-
-				seg.ds_addr =
-				    (bus_addr_t)(vm_offset_t)csio->data_ptr;
-				seg.ds_len = csio->dxfer_len;
-				ahc_execute_scb(scb, &seg, 1, 0);
-			}
-		} else {
-			struct bus_dma_segment *segs;
-
-			if ((ccb_h->flags & CAM_DATA_PHYS) != 0)
-				panic("ahc_setup_data - Physical segment "
-				      "pointers unsupported");
-
-			if ((ccb_h->flags & CAM_SG_LIST_PHYS) == 0)
-				panic("ahc_setup_data - Virtual segment "
-				      "addresses unsupported");
-
-			/* Just use the segments provided */
-			segs = (struct bus_dma_segment *)csio->data_ptr;
-			ahc_execute_scb(scb, segs, csio->sglist_cnt, 0);
-		}
-	} else {
-		ahc_execute_scb(scb, NULL, 0, 0);
+	error = bus_dmamap_load_ccb(ahc->buffer_dmat,
+				    scb->dmamap,
+				    (union ccb *)csio,
+				    ahc_execute_scb,
+				    scb,
+				    0);
+	if (error == EINPROGRESS) {
+		/*
+		 * So as to maintain ordering,
+		 * freeze the controller queue
+		 * until our mapping is
+		 * returned.
+		 */
+		xpt_freeze_simq(sim, /*count*/1);
+		scb->io_ctx->ccb_h.status |= CAM_RELEASE_SIMQ;
 	}
 }
 
diff --git a/sys/dev/amr/amr_cam.c b/sys/dev/amr/amr_cam.c
index d03ac6d..a1e0a88 100644
--- a/sys/dev/amr/amr_cam.c
+++ b/sys/dev/amr/amr_cam.c
@@ -274,12 +274,9 @@ amr_cam_action(struct cam_sim *sim, union ccb *ccb)
 		 * address
 		 */
 		if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if (ccbh->flags & CAM_DATA_PHYS)
+			if ((ccbh->flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
 				/* we can't map it */
 				ccbh->status = CAM_REQ_INVALID;
-			if (ccbh->flags & CAM_SCATTER_VALID)
-				/* we want to do the s/g setup */
-				ccbh->status = CAM_REQ_INVALID;
 		}
 	
 		/*
diff --git a/sys/dev/arcmsr/arcmsr.c b/sys/dev/arcmsr/arcmsr.c
index 2096a22..c815d02 100644
--- a/sys/dev/arcmsr/arcmsr.c
+++ b/sys/dev/arcmsr/arcmsr.c
@@ -2341,7 +2341,7 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb, union ccb *p
 				(u_int32_t ) pccb->csio.cdb_io.cdb_bytes[7] << 8  |
 				(u_int32_t ) pccb->csio.cdb_io.cdb_bytes[8];
 					/* 4 bytes: Areca io control code */
-	if((pccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
+	if ((pccb->ccb_h.flags & CAM_DATA_MASK) == CAM_DATA_VADDR) {
 		buffer = pccb->csio.data_ptr;
 		transfer_len = pccb->csio.dxfer_len;
 	} else {
@@ -2731,6 +2731,7 @@ static void arcmsr_action(struct cam_sim *psim, union ccb *pccb)
 	case XPT_SCSI_IO: {
 			struct CommandControlBlock *srb;
 			int target = pccb->ccb_h.target_id;
+			int error;
 	
 			if(target == 16) {
 				/* virtual device for iop message transfer */
@@ -2745,52 +2746,13 @@ static void arcmsr_action(struct cam_sim *psim, union ccb *pccb)
 			pccb->ccb_h.arcmsr_ccbsrb_ptr = srb;
 			pccb->ccb_h.arcmsr_ccbacb_ptr = acb;
 			srb->pccb = pccb;
-			if((pccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-				if(!(pccb->ccb_h.flags & CAM_SCATTER_VALID)) {
-					/* Single buffer */
-					if(!(pccb->ccb_h.flags & CAM_DATA_PHYS)) {
-						/* Buffer is virtual */
-						u_int32_t error, s;
-	
-						s = splsoftvm();
-						error =	bus_dmamap_load(acb->dm_segs_dmat
-							, srb->dm_segs_dmamap
-							, pccb->csio.data_ptr
-							, pccb->csio.dxfer_len
-							, arcmsr_execute_srb, srb, /*flags*/0);
-	         				if(error == EINPROGRESS) {
-							xpt_freeze_simq(acb->psim, 1);
-							pccb->ccb_h.status |= CAM_RELEASE_SIMQ;
-						}
-						splx(s);
-					}
-					else {		/* Buffer is physical */
-#ifdef	PAE
-						panic("arcmsr: CAM_DATA_PHYS not supported");
-#else
-						struct bus_dma_segment seg;
-						
-						seg.ds_addr = (bus_addr_t)pccb->csio.data_ptr;
-						seg.ds_len = pccb->csio.dxfer_len;
-						arcmsr_execute_srb(srb, &seg, 1, 0);
-#endif
-					}
-				} else { 
-					/* Scatter/gather list */
-					struct bus_dma_segment *segs;
-	
-					if((pccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0
-					|| (pccb->ccb_h.flags & CAM_DATA_PHYS) != 0) {
-						pccb->ccb_h.status |= CAM_PROVIDE_FAIL;
-						xpt_done(pccb);
-						free(srb, M_DEVBUF);
-						return;
-					}
-					segs = (struct bus_dma_segment *)pccb->csio.data_ptr;
-					arcmsr_execute_srb(srb, segs, pccb->csio.sglist_cnt, 0);
-				}
-			} else {
-				arcmsr_execute_srb(srb, NULL, 0, 0);
+			error =	bus_dmamap_load_ccb(acb->dm_segs_dmat
+				, srb->dm_segs_dmamap
+				, pccb
+				, arcmsr_execute_srb, srb, /*flags*/0);
+			if(error == EINPROGRESS) {
+				xpt_freeze_simq(acb->psim, 1);
+				pccb->ccb_h.status |= CAM_RELEASE_SIMQ;
 			}
 			break;
 		}
diff --git a/sys/dev/ata/ata-dma.c b/sys/dev/ata/ata-dma.c
index ffd2461..9aea845 100644
--- a/sys/dev/ata/ata-dma.c
+++ b/sys/dev/ata/ata-dma.c
@@ -304,10 +304,17 @@ ata_dmaload(struct ata_request *request, void *addr, int *entries)
     else
 	dspa.dmatab = request->dma->sg;
 
-    if ((error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
-				 request->data, request->bytecount,
-				 ch->dma.setprd, &dspa, BUS_DMA_NOWAIT)) ||
-				 (error = dspa.error)) {
+#ifdef ATA_CAM
+    if (request->ccb)
+        error = bus_dmamap_load_ccb(request->dma->data_tag,
+				request->dma->data_map, request->ccb,
+				ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
+    else
+#endif
+        error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
+				request->data, request->bytecount,
+				ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
+    if (error || (error = dspa.error)) {
 	device_printf(request->parent, "FAILURE - load data\n");
 	goto error;
     }
diff --git a/sys/dev/ata/atapi-cam.c b/sys/dev/ata/atapi-cam.c
index 363aa94..0181785 100644
--- a/sys/dev/ata/atapi-cam.c
+++ b/sys/dev/ata/atapi-cam.c
@@ -514,12 +514,6 @@ atapi_action(struct cam_sim *sim, union ccb *ccb)
 		("CAM CCB too long for ATAPI"));
 	    goto action_invalid;
 	}
-	if ((ccb_h->flags & CAM_SCATTER_VALID)) {
-	    /* scatter-gather not supported */
-	    xpt_print_path(ccb_h->path);
-	    printf("ATAPI/CAM does not support scatter-gather yet!\n");
-	    goto action_invalid;
-	}
 
 	switch (ccb_h->flags & CAM_DIR_MASK) {
 	case CAM_DIR_IN:
diff --git a/sys/dev/buslogic/bt.c b/sys/dev/buslogic/bt.c
index 51f5fdd..a2c9f4f 100644
--- a/sys/dev/buslogic/bt.c
+++ b/sys/dev/buslogic/bt.c
@@ -1158,6 +1158,7 @@ btaction(struct cam_sim *sim, union ccb *ccb)
 		if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
 			struct ccb_scsiio *csio;
 			struct ccb_hdr *ccbh;
+			int error;
 
 			csio = &ccb->csio;
 			ccbh = &csio->ccb_h;
@@ -1205,67 +1206,21 @@ btaction(struct cam_sim *sim, union ccb *ccb)
 			 * If we have any data to send with this command,
 			 * map it into bus space.
 			 */
-		        /* Only use S/G if there is a transfer */
-			if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-				if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
-					/*
-					 * We've been given a pointer
-					 * to a single buffer.
-					 */
-					if ((ccbh->flags & CAM_DATA_PHYS)==0) {
-						int error;
-
-						error = bus_dmamap_load(
-						    bt->buffer_dmat,
-						    bccb->dmamap,
-						    csio->data_ptr,
-						    csio->dxfer_len,
-						    btexecuteccb,
-						    bccb,
-						    /*flags*/0);
-						if (error == EINPROGRESS) {
-							/*
-							 * So as to maintain
-							 * ordering, freeze the
-							 * controller queue
-							 * until our mapping is
-							 * returned.
-							 */
-							xpt_freeze_simq(bt->sim,
-									1);
-							csio->ccb_h.status |=
-							    CAM_RELEASE_SIMQ;
-						}
-					} else {
-						struct bus_dma_segment seg; 
-
-						/* Pointer to physical buffer */
-						seg.ds_addr =
-						    (bus_addr_t)csio->data_ptr;
-						seg.ds_len = csio->dxfer_len;
-						btexecuteccb(bccb, &seg, 1, 0);
-					}
-				} else {
-					struct bus_dma_segment *segs;
-
-					if ((ccbh->flags & CAM_DATA_PHYS) != 0)
-						panic("btaction - Physical "
-						      "segment pointers "
-						      "unsupported");
-
-					if ((ccbh->flags&CAM_SG_LIST_PHYS)==0)
-						panic("btaction - Virtual "
-						      "segment addresses "
-						      "unsupported");
-
-					/* Just use the segments provided */
-					segs = (struct bus_dma_segment *)
-					    csio->data_ptr;
-					btexecuteccb(bccb, segs,
-						     csio->sglist_cnt, 0);
-				}
-			} else {
-				btexecuteccb(bccb, NULL, 0, 0);
+			error = bus_dmamap_load_ccb(
+			    bt->buffer_dmat,
+			    bccb->dmamap,
+			    ccb,
+			    btexecuteccb,
+			    bccb,
+			    /*flags*/0);
+			if (error == EINPROGRESS) {
+				/*
+				 * So as to maintain ordering, freeze the
+				 * controller queue until our mapping is
+				 * returned.
+				 */
+				xpt_freeze_simq(bt->sim, 1);
+				csio->ccb_h.status |= CAM_RELEASE_SIMQ;
 			}
 		} else {
 			hccb->opcode = INITIATOR_BUS_DEV_RESET;
diff --git a/sys/dev/ciss/ciss.c b/sys/dev/ciss/ciss.c
index a3f0a4a..9aef998 100644
--- a/sys/dev/ciss/ciss.c
+++ b/sys/dev/ciss/ciss.c
@@ -2688,9 +2688,14 @@ ciss_map_request(struct ciss_request *cr)
 		    BUS_DMASYNC_PREWRITE);
 
     if (cr->cr_data != NULL) {
-	error = bus_dmamap_load(sc->ciss_buffer_dmat, cr->cr_datamap,
-				cr->cr_data, cr->cr_length,
-				ciss_request_map_helper, cr, 0);
+	if (cr->cr_flags & CISS_REQ_CCB)
+		error = bus_dmamap_load_ccb(sc->ciss_buffer_dmat,
+					cr->cr_datamap, cr->cr_data,
+					ciss_request_map_helper, cr, 0);
+	else
+		error = bus_dmamap_load(sc->ciss_buffer_dmat, cr->cr_datamap,
+					cr->cr_data, cr->cr_length,
+					ciss_request_map_helper, cr, 0);
 	if (error != 0)
 	    return (error);
     } else {
@@ -3056,18 +3061,6 @@ ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
 	csio->ccb_h.status = CAM_REQ_CMP_ERR;
     }
 
-    /* if there is data transfer, it must be to/from a virtual address */
-    if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-	if (csio->ccb_h.flags & CAM_DATA_PHYS) {		/* we can't map it */
-	    debug(3, "  data pointer is to physical address");
-	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
-	}
-	if (csio->ccb_h.flags & CAM_SCATTER_VALID) {	/* we want to do the s/g setup */
-	    debug(3, "  data has premature s/g setup");
-	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
-	}
-    }
-
     /* abandon aborted ccbs or those that have failed validation */
     if ((csio->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
 	debug(3, "abandoning CCB due to abort/validation failure");
@@ -3094,7 +3087,7 @@ ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
      * Build the command.
      */
     cc = cr->cr_cc;
-    cr->cr_data = csio->data_ptr;
+    cr->cr_data = csio;
     cr->cr_length = csio->dxfer_len;
     cr->cr_complete = ciss_cam_complete;
     cr->cr_private = csio;
@@ -3112,12 +3105,13 @@ ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
     cc->cdb.type = CISS_CDB_TYPE_COMMAND;
     cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;	/* XXX ordered tags? */
     if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
-	cr->cr_flags = CISS_REQ_DATAOUT;
+	cr->cr_flags = CISS_REQ_DATAOUT | CISS_REQ_CCB;
 	cc->cdb.direction = CISS_CDB_DIRECTION_WRITE;
     } else if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
-	cr->cr_flags = CISS_REQ_DATAIN;
+	cr->cr_flags = CISS_REQ_DATAIN | CISS_REQ_CCB;
 	cc->cdb.direction = CISS_CDB_DIRECTION_READ;
     } else {
+	cr->cr_data = NULL;
 	cr->cr_flags = 0;
 	cc->cdb.direction = CISS_CDB_DIRECTION_NONE;
     }
diff --git a/sys/dev/ciss/cissvar.h b/sys/dev/ciss/cissvar.h
index e89e4e9..b3719cfa 100644
--- a/sys/dev/ciss/cissvar.h
+++ b/sys/dev/ciss/cissvar.h
@@ -116,6 +116,7 @@ struct ciss_request
 #define CISS_REQ_DATAOUT	(1<<3)		/* data host->adapter */
 #define CISS_REQ_DATAIN		(1<<4)		/* data adapter->host */
 #define CISS_REQ_BUSY		(1<<5)		/* controller has req */
+#define CISS_REQ_CCB		(1<<6)		/* data is ccb */
 
     void			(* cr_complete)(struct ciss_request *);
     void			*cr_private;
diff --git a/sys/dev/dpt/dpt_scsi.c b/sys/dev/dpt/dpt_scsi.c
index b4a73c9..908f0f8 100644
--- a/sys/dev/dpt/dpt_scsi.c
+++ b/sys/dev/dpt/dpt_scsi.c
@@ -910,56 +910,22 @@ dpt_action(struct cam_sim *sim, union ccb *ccb)
 		 */
 	        /* Only use S/G if there is a transfer */
 		if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
+			int error;
+
+			error = bus_dmamap_load_ccb(dpt->buffer_dmat,
+						    dccb->dmamap,
+						    ccb,
+						    dptexecuteccb,
+						    dccb, /*flags*/0);
+			if (error == EINPROGRESS) {
 				/*
-				 * We've been given a pointer
-				 * to a single buffer.
+				 * So as to maintain ordering,
+				 * freeze the controller queue
+				 * until our mapping is
+				 * returned.
 				 */
-				if ((ccbh->flags & CAM_DATA_PHYS) == 0) {
-					int error;
-
-					error =
-					    bus_dmamap_load(dpt->buffer_dmat,
-							    dccb->dmamap,
-							    csio->data_ptr,
-							    csio->dxfer_len,
-							    dptexecuteccb,
-							    dccb, /*flags*/0);
-					if (error == EINPROGRESS) {
-						/*
-						 * So as to maintain ordering,
-						 * freeze the controller queue
-						 * until our mapping is
-						 * returned.
-						 */
-						xpt_freeze_simq(sim, 1);
-						dccb->state |= CAM_RELEASE_SIMQ;
-					}
-				} else {
-					struct bus_dma_segment seg; 
-
-					/* Pointer to physical buffer */
-					seg.ds_addr =
-					    (bus_addr_t)csio->data_ptr;
-					seg.ds_len = csio->dxfer_len;
-					dptexecuteccb(dccb, &seg, 1, 0);
-				}
-			} else {
-				struct bus_dma_segment *segs;
-
-				if ((ccbh->flags & CAM_DATA_PHYS) != 0)
-					panic("dpt_action - Physical "
-					      "segment pointers "
-					      "unsupported");
-
-				if ((ccbh->flags&CAM_SG_LIST_PHYS)==0)
-					panic("dpt_action - Virtual "
-					      "segment addresses "
-					      "unsupported");
-
-				/* Just use the segments provided */
-				segs = (struct bus_dma_segment *)csio->data_ptr;
-				dptexecuteccb(dccb, segs, csio->sglist_cnt, 0);
+				xpt_freeze_simq(sim, 1);
+				dccb->state |= CAM_RELEASE_SIMQ;
 			}
 		} else {
 			/*
diff --git a/sys/dev/firewire/sbp.c b/sys/dev/firewire/sbp.c
index 9204449..8089d99 100644
--- a/sys/dev/firewire/sbp.c
+++ b/sys/dev/firewire/sbp.c
@@ -2478,11 +2478,6 @@ END_DEBUG
 			ocb->orb[4] |= htonl(ORB_CMD_IN);
 		}
 
-		if (csio->ccb_h.flags & CAM_SCATTER_VALID)
-			printf("sbp: CAM_SCATTER_VALID\n");
-		if (csio->ccb_h.flags & CAM_DATA_PHYS)
-			printf("sbp: CAM_DATA_PHYS\n");
-
 		if (csio->ccb_h.flags & CAM_CDB_POINTER)
 			cdb = (void *)csio->cdb_io.cdb_ptr;
 		else
@@ -2496,10 +2491,9 @@ printf("ORB %08x %08x %08x %08x\n", ntohl(ocb->orb[4]), ntohl(ocb->orb[5]), ntoh
 			int s, error;
 
 			s = splsoftvm();
-			error = bus_dmamap_load(/*dma tag*/sbp->dmat,
+			error = bus_dmamap_load_ccb(/*dma tag*/sbp->dmat,
 					/*dma map*/ocb->dmamap,
-					ccb->csio.data_ptr,
-					ccb->csio.dxfer_len,
+					ccb,
 					sbp_execute_ocb,
 					ocb,
 					/*flags*/0);
diff --git a/sys/dev/hpt27xx/osm_bsd.c b/sys/dev/hpt27xx/osm_bsd.c
index fab1c71d..9f4d1b9 100644
--- a/sys/dev/hpt27xx/osm_bsd.c
+++ b/sys/dev/hpt27xx/osm_bsd.c
@@ -474,33 +474,6 @@ static void os_cmddone(PCOMMAND pCmd)
 
 static int os_buildsgl(PCOMMAND pCmd, PSG pSg, int logical)
 {
-	POS_CMDEXT ext = (POS_CMDEXT)pCmd->priv;
-	union ccb *ccb = ext->ccb;
-	bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-	int idx;
-
-	if(logical)	{
-		if (ccb->ccb_h.flags & CAM_DATA_PHYS)
-			panic("physical address unsupported");
-
-		if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-			if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-				panic("physical address unsupported");
-	
-			for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-				os_set_sgptr(&pSg[idx], (HPT_U8 *)(HPT_UPTR)sgList[idx].ds_addr);
-				pSg[idx].size = sgList[idx].ds_len;
-				pSg[idx].eot = (idx==ccb->csio.sglist_cnt-1)? 1 : 0;
-			}
-		}
-		else {
-			os_set_sgptr(pSg, (HPT_U8 *)ccb->csio.data_ptr);
-			pSg->size = ccb->csio.dxfer_len;
-			pSg->eot = 1;
-		}
-		return TRUE;
-	}
-
 	/* since we have provided physical sg, nobody will ask us to build physical sg */
 	HPT_ASSERT(0);
 	return FALSE;
@@ -515,23 +488,27 @@ static void hpt_io_dmamap_callback(void *arg, bus_dma_segment_t *segs, int nsegs
 	
 	HPT_ASSERT(pCmd->flags.physical_sg);
 	
-	if (error || nsegs == 0)
+	if (error)
 		panic("busdma error");
 		
 	HPT_ASSERT(nsegs<=os_max_sg_descriptors);
 
-	for (idx = 0; idx < nsegs; idx++, psg++) {
-		psg->addr.bus = segs[idx].ds_addr;
-		psg->size = segs[idx].ds_len;
-		psg->eot = 0;
-	}
-	psg[-1].eot = 1;
+	if (nsegs != 0) {
+		for (idx = 0; idx < nsegs; idx++, psg++) {
+			psg->addr.bus = segs[idx].ds_addr;
+			psg->size = segs[idx].ds_len;
+			psg->eot = 0;
+		}
+		psg[-1].eot = 1;
 	
-	if (pCmd->flags.data_in) {
-		bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map, BUS_DMASYNC_PREREAD);
-	}
-	else if (pCmd->flags.data_out) {
-		bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map, BUS_DMASYNC_PREWRITE);
+		if (pCmd->flags.data_in) {
+			bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map,
+			    BUS_DMASYNC_PREREAD);
+		}
+		else if (pCmd->flags.data_out) {
+			bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map,
+			    BUS_DMASYNC_PREWRITE);
+		}
 	}
 
 	ext->ccb->ccb_h.timeout_ch = timeout(hpt_timeout, pCmd, HPT_OSM_TIMEOUT);
@@ -661,6 +638,7 @@ static void hpt_scsi_io(PVBUS_EXT vbus_ext, union ccb *ccb)
 	case 0x2f:
 	case 0x8f: /* VERIFY_16 */
 	{
+		int error;
 		pCmd = ldm_alloc_cmds(vbus, vd->cmds_per_request);
 		if(!pCmd){
 			KdPrint(("Failed to allocate command!"));
@@ -717,42 +695,20 @@ static void hpt_scsi_io(PVBUS_EXT vbus_ext, union ccb *ccb)
 		pCmd->target = vd;
 		pCmd->done = os_cmddone;
 		pCmd->buildsgl = os_buildsgl;
-
 		pCmd->psg = ext->psg;
-		
-		if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-			int idx;
-			bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-			
-			if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-				pCmd->flags.physical_sg = 1;
-				
-			for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-				pCmd->psg[idx].addr.bus = sgList[idx].ds_addr;
-				pCmd->psg[idx].size = sgList[idx].ds_len;
-				pCmd->psg[idx].eot = (idx==ccb->csio.sglist_cnt-1)? 1 : 0;
-			}
-
-			ccb->ccb_h.timeout_ch = timeout(hpt_timeout, pCmd, HPT_OSM_TIMEOUT);
-			ldm_queue_cmd(pCmd);
-		}
-		else {
-			int error;
-			pCmd->flags.physical_sg = 1;
-			error = bus_dmamap_load(vbus_ext->io_dmat, 
-						ext->dma_map, 
-						ccb->csio.data_ptr, ccb->csio.dxfer_len, 
-						hpt_io_dmamap_callback, pCmd,
+		pCmd->flags.physical_sg = 1;
+		error = bus_dmamap_load_ccb(vbus_ext->io_dmat, 
+					ext->dma_map, ccb, 
+					hpt_io_dmamap_callback, pCmd,
 				    	BUS_DMA_WAITOK
 					);
-			KdPrint(("bus_dmamap_load return %d", error));
-			if (error && error!=EINPROGRESS) {
-				os_printk("bus_dmamap_load error %d", error);
-				cmdext_put(ext);
-				ldm_free_cmds(pCmd);
-				ccb->ccb_h.status = CAM_REQ_CMP_ERR;
-				xpt_done(ccb);
-			}
+		KdPrint(("bus_dmamap_load return %d", error));
+		if (error && error!=EINPROGRESS) {
+			os_printk("bus_dmamap_load error %d", error);
+			cmdext_put(ext);
+			ldm_free_cmds(pCmd);
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+			xpt_done(ccb);
 		}
 		return;
 	}
diff --git a/sys/dev/hptiop/hptiop.c b/sys/dev/hptiop/hptiop.c
index c4e3d5a..e3190d2 100644
--- a/sys/dev/hptiop/hptiop.c
+++ b/sys/dev/hptiop/hptiop.c
@@ -2358,6 +2358,7 @@ static void hptiop_action(struct cam_sim *sim, union ccb *ccb)
 {
 	struct hpt_iop_hba * hba = (struct hpt_iop_hba *)cam_sim_softc(sim);
 	struct hpt_iop_srb * srb;
+	int error;
 
 	switch (ccb->ccb_h.func_code) {
 
@@ -2380,52 +2381,22 @@ static void hptiop_action(struct cam_sim *sim, union ccb *ccb)
 		}
 
 		srb->ccb = ccb;
-
-		if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
-			hptiop_post_scsi_command(srb, NULL, 0, 0);
-		else if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
-			if ((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-				int error;
-
-				error = bus_dmamap_load(hba->io_dmat,
-						srb->dma_map,
-						ccb->csio.data_ptr,
-						ccb->csio.dxfer_len,
-						hptiop_post_scsi_command,
-						srb, 0);
-
-				if (error && error != EINPROGRESS) {
-					device_printf(hba->pcidev,
-						"%d bus_dmamap_load error %d",
-						hba->pciunit, error);
-					xpt_freeze_simq(hba->sim, 1);
-					ccb->ccb_h.status = CAM_REQ_CMP_ERR;
-invalid:
-					hptiop_free_srb(hba, srb);
-					xpt_done(ccb);
-					goto scsi_done;
-				}
-			}
-			else {
-				device_printf(hba->pcidev,
-					"CAM_DATA_PHYS not supported");
-				ccb->ccb_h.status = CAM_REQ_CMP_ERR;
-				goto invalid;
-			}
-		}
-		else {
-			struct bus_dma_segment *segs;
-
-			if ((ccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0 ||
-				(ccb->ccb_h.flags & CAM_DATA_PHYS) != 0) {
-				device_printf(hba->pcidev, "SCSI cmd failed");
-				ccb->ccb_h.status=CAM_PROVIDE_FAIL;
-				goto invalid;
-			}
-
-			segs = (struct bus_dma_segment *)ccb->csio.data_ptr;
-			hptiop_post_scsi_command(srb, segs,
-						ccb->csio.sglist_cnt, 0);
+		error = bus_dmamap_load_ccb(hba->io_dmat,
+					    srb->dma_map,
+					    ccb,
+					    hptiop_post_scsi_command,
+					    srb,
+					    0);
+
+		if (error && error != EINPROGRESS) {
+			device_printf(hba->pcidev,
+				"%d bus_dmamap_load error %d",
+				hba->pciunit, error);
+			xpt_freeze_simq(hba->sim, 1);
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+			hptiop_free_srb(hba, srb);
+			xpt_done(ccb);
+			goto scsi_done;
 		}
 
 scsi_done:
diff --git a/sys/dev/hptmv/entry.c b/sys/dev/hptmv/entry.c
index 8dfa7e2..248d655 100644
--- a/sys/dev/hptmv/entry.c
+++ b/sys/dev/hptmv/entry.c
@@ -2620,32 +2620,7 @@ launch_worker_thread(void)
 
 int HPTLIBAPI fOsBuildSgl(_VBUS_ARG PCommand pCmd, FPSCAT_GATH pSg, int logical)
 {
-	union ccb *ccb = (union ccb *)pCmd->pOrgCommand;
-	bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-	int idx;
 
-	if(logical) {
-		if (ccb->ccb_h.flags & CAM_DATA_PHYS)
-			panic("physical address unsupported");
-	
-		if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-			if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-				panic("physical address unsupported");
-		
-			for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-				pSg[idx].dSgAddress = (ULONG_PTR)(UCHAR *)sgList[idx].ds_addr;
-				pSg[idx].wSgSize = sgList[idx].ds_len;
-				pSg[idx].wSgFlag = (idx==ccb->csio.sglist_cnt-1)? SG_FLAG_EOT : 0;
-			}
-		}
-		else {
-			pSg->dSgAddress = (ULONG_PTR)(UCHAR *)ccb->csio.data_ptr;
-			pSg->wSgSize = ccb->csio.dxfer_len;
-			pSg->wSgFlag = SG_FLAG_EOT;
-		}
-		return TRUE;
-	}
-	
 	/* since we have provided physical sg, nobody will ask us to build physical sg */
 	HPT_ASSERT(0);
 	return FALSE;
@@ -2757,24 +2732,28 @@ hpt_io_dmamap_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 
 	HPT_ASSERT(pCmd->cf_physical_sg);
 		
-	if (error || nsegs == 0)
+	if (error)
 		panic("busdma error");
 		
 	HPT_ASSERT(nsegs<= MAX_SG_DESCRIPTORS);
 
-	for (idx = 0; idx < nsegs; idx++, psg++) {
-		psg->dSgAddress = (ULONG_PTR)(UCHAR *)segs[idx].ds_addr;
-		psg->wSgSize = segs[idx].ds_len;
-		psg->wSgFlag = (idx == nsegs-1)? SG_FLAG_EOT: 0;
-/*		KdPrint(("psg[%d]:add=%p,size=%x,flag=%x\n", idx, psg->dSgAddress,psg->wSgSize,psg->wSgFlag)); */
-	}
-/*	psg[-1].wSgFlag = SG_FLAG_EOT; */
-	
-	if (pCmd->cf_data_in) {
-		bus_dmamap_sync(pAdapter->io_dma_parent, pmap->dma_map, BUS_DMASYNC_PREREAD);
-	}
-	else if (pCmd->cf_data_out) {
-		bus_dmamap_sync(pAdapter->io_dma_parent, pmap->dma_map, BUS_DMASYNC_PREWRITE);
+	if (nsegs != 0) {
+		for (idx = 0; idx < nsegs; idx++, psg++) {
+			psg->dSgAddress = (ULONG_PTR)(UCHAR *)segs[idx].ds_addr;
+			psg->wSgSize = segs[idx].ds_len;
+			psg->wSgFlag = (idx == nsegs-1)? SG_FLAG_EOT: 0;
+	/*		KdPrint(("psg[%d]:add=%p,size=%x,flag=%x\n", idx, psg->dSgAddress,psg->wSgSize,psg->wSgFlag)); */
+		}
+		/*	psg[-1].wSgFlag = SG_FLAG_EOT; */
+		
+		if (pCmd->cf_data_in) {
+			bus_dmamap_sync(pAdapter->io_dma_parent, pmap->dma_map,
+			    BUS_DMASYNC_PREREAD);
+		}
+		else if (pCmd->cf_data_out) {
+			bus_dmamap_sync(pAdapter->io_dma_parent, pmap->dma_map,
+			    BUS_DMASYNC_PREWRITE);
+		}
 	}
 
 	ccb->ccb_h.timeout_ch = timeout(hpt_timeout, (caddr_t)ccb, 20*hz);
@@ -2883,6 +2862,7 @@ OsSendCommand(_VBUS_ARG union ccb *ccb)
 			UCHAR CdbLength;
 			_VBUS_INST(pVDev->pVBus)
 			PCommand pCmd = AllocateCommand(_VBUS_P0);
+			int error;
 			HPT_ASSERT(pCmd);
 
 			CdbLength = csio->cdb_len;
@@ -2960,40 +2940,21 @@ OsSendCommand(_VBUS_ARG union ccb *ccb)
 					break;
 			}
 /*///////////////////////// */
-			if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-				int idx;
-				bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-				
-				if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-					pCmd->cf_physical_sg = 1;
-
-				for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-					pCmd->pSgTable[idx].dSgAddress = (ULONG_PTR)(UCHAR *)sgList[idx].ds_addr;
-					pCmd->pSgTable[idx].wSgSize = sgList[idx].ds_len;
-					pCmd->pSgTable[idx].wSgFlag= (idx==ccb->csio.sglist_cnt-1)?SG_FLAG_EOT: 0;
-				}
-	
-				ccb->ccb_h.timeout_ch = timeout(hpt_timeout, (caddr_t)ccb, 20*hz);
-				pVDev->pfnSendCommand(_VBUS_P pCmd);
-			}	
-			else {
-				int error;
-				pCmd->cf_physical_sg = 1;
-				error = bus_dmamap_load(pAdapter->io_dma_parent, 
-							pmap->dma_map, 
-							ccb->csio.data_ptr, ccb->csio.dxfer_len, 
-							hpt_io_dmamap_callback, pCmd,
-					    		BUS_DMA_WAITOK
-						);
-				KdPrint(("bus_dmamap_load return %d\n", error));
-				if (error && error!=EINPROGRESS) {
-					hpt_printk(("bus_dmamap_load error %d\n", error));
-					FreeCommand(_VBUS_P pCmd);
-					ccb->ccb_h.status = CAM_REQ_CMP_ERR;
-					dmamap_put(pmap);
-					pAdapter->outstandingCommands--;
-					xpt_done(ccb);
-				}
+			pCmd->cf_physical_sg = 1;
+			error = bus_dmamap_load_ccb(pAdapter->io_dma_parent, 
+						    pmap->dma_map, 
+						    ccb,
+						    hpt_io_dmamap_callback,
+						    pCmd, BUS_DMA_WAITOK
+						    );
+			KdPrint(("bus_dmamap_load return %d\n", error));
+			if (error && error!=EINPROGRESS) {
+				hpt_printk(("bus_dmamap_load error %d\n", error));
+				FreeCommand(_VBUS_P pCmd);
+				ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+				dmamap_put(pmap);
+				pAdapter->outstandingCommands--;
+				xpt_done(ccb);
 			}
 			goto Command_Complished;
 		}
diff --git a/sys/dev/hptrr/hptrr_osm_bsd.c b/sys/dev/hptrr/hptrr_osm_bsd.c
index cff4254..3c31f8c 100644
--- a/sys/dev/hptrr/hptrr_osm_bsd.c
+++ b/sys/dev/hptrr/hptrr_osm_bsd.c
@@ -481,32 +481,6 @@ static void os_cmddone(PCOMMAND pCmd)
 
 static int os_buildsgl(PCOMMAND pCmd, PSG pSg, int logical)
 {
-	POS_CMDEXT ext = (POS_CMDEXT)pCmd->priv;
-	union ccb *ccb = ext->ccb;
-	bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-	int idx;
-
-	if(logical)	{
-		if (ccb->ccb_h.flags & CAM_DATA_PHYS)
-			panic("physical address unsupported");
-
-		if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-			if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-				panic("physical address unsupported");
-	
-			for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-				os_set_sgptr(&pSg[idx], (HPT_U8 *)(HPT_UPTR)sgList[idx].ds_addr);
-				pSg[idx].size = sgList[idx].ds_len;
-				pSg[idx].eot = (idx==ccb->csio.sglist_cnt-1)? 1 : 0;
-			}
-		}
-		else {
-			os_set_sgptr(pSg, (HPT_U8 *)ccb->csio.data_ptr);
-			pSg->size = ccb->csio.dxfer_len;
-			pSg->eot = 1;
-		}
-		return TRUE;
-	}
 
 	/* since we have provided physical sg, nobody will ask us to build physical sg */
 	HPT_ASSERT(0);
@@ -522,25 +496,28 @@ static void hpt_io_dmamap_callback(void *arg, bus_dma_segment_t *segs, int nsegs
 	
 	HPT_ASSERT(pCmd->flags.physical_sg);
 	
-	if (error || nsegs == 0)
+	if (error)
 		panic("busdma error");
 		
 	HPT_ASSERT(nsegs<=os_max_sg_descriptors);
 
-	for (idx = 0; idx < nsegs; idx++, psg++) {
-		psg->addr.bus = segs[idx].ds_addr;
-		psg->size = segs[idx].ds_len;
-		psg->eot = 0;
-	}
-	psg[-1].eot = 1;
-	
-	if (pCmd->flags.data_in) {
-		bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map, BUS_DMASYNC_PREREAD);
-	}
-	else if (pCmd->flags.data_out) {
-		bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map, BUS_DMASYNC_PREWRITE);
+	if (nsegs != 0) {
+		for (idx = 0; idx < nsegs; idx++, psg++) {
+			psg->addr.bus = segs[idx].ds_addr;
+			psg->size = segs[idx].ds_len;
+			psg->eot = 0;
+		}
+			psg[-1].eot = 1;
+		
+		if (pCmd->flags.data_in) {
+			bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map,
+			    BUS_DMASYNC_PREREAD);
+		}
+		else if (pCmd->flags.data_out) {
+			bus_dmamap_sync(ext->vbus_ext->io_dmat, ext->dma_map,
+			    BUS_DMASYNC_PREWRITE);
+		}
 	}
-
 	ext->ccb->ccb_h.timeout_ch = timeout(hpt_timeout, pCmd, HPT_OSM_TIMEOUT);
 	ldm_queue_cmd(pCmd);
 }
@@ -667,6 +644,8 @@ static void hpt_scsi_io(PVBUS_EXT vbus_ext, union ccb *ccb)
 	case 0x13:
 	case 0x2f:
 	{
+		int error;
+
 		pCmd = ldm_alloc_cmds(vbus, vd->cmds_per_request);
 		if(!pCmd){
 			KdPrint(("Failed to allocate command!"));
@@ -722,42 +701,21 @@ static void hpt_scsi_io(PVBUS_EXT vbus_ext, union ccb *ccb)
 		pCmd->target = vd;
 		pCmd->done = os_cmddone;
 		pCmd->buildsgl = os_buildsgl;
-
 		pCmd->psg = ext->psg;
-		
-		if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
-			int idx;
-			bus_dma_segment_t *sgList = (bus_dma_segment_t *)ccb->csio.data_ptr;
-			
-			if (ccb->ccb_h.flags & CAM_SG_LIST_PHYS)
-				pCmd->flags.physical_sg = 1;
-				
-			for (idx = 0; idx < ccb->csio.sglist_cnt; idx++) {
-				pCmd->psg[idx].addr.bus = sgList[idx].ds_addr;
-				pCmd->psg[idx].size = sgList[idx].ds_len;
-				pCmd->psg[idx].eot = (idx==ccb->csio.sglist_cnt-1)? 1 : 0;
-			}
-
-			ccb->ccb_h.timeout_ch = timeout(hpt_timeout, pCmd, HPT_OSM_TIMEOUT);
-			ldm_queue_cmd(pCmd);
-		}
-		else {
-			int error;
-			pCmd->flags.physical_sg = 1;
-			error = bus_dmamap_load(vbus_ext->io_dmat, 
-						ext->dma_map, 
-						ccb->csio.data_ptr, ccb->csio.dxfer_len, 
-						hpt_io_dmamap_callback, pCmd,
-				    	BUS_DMA_WAITOK
+		pCmd->flags.physical_sg = 1;
+		error = bus_dmamap_load_ccb(vbus_ext->io_dmat, 
+					ext->dma_map, 
+					ccb,
+					hpt_io_dmamap_callback, pCmd,
+			    		BUS_DMA_WAITOK
 					);
-			KdPrint(("bus_dmamap_load return %d", error));
-			if (error && error!=EINPROGRESS) {
-				os_printk("bus_dmamap_load error %d", error);
-				cmdext_put(ext);
-				ldm_free_cmds(pCmd);
-				ccb->ccb_h.status = CAM_REQ_CMP_ERR;
-				xpt_done(ccb);
-			}
+		KdPrint(("bus_dmamap_load return %d", error));
+		if (error && error!=EINPROGRESS) {
+			os_printk("bus_dmamap_load error %d", error);
+			cmdext_put(ext);
+			ldm_free_cmds(pCmd);
+			ccb->ccb_h.status = CAM_REQ_CMP_ERR;
+			xpt_done(ccb);
 		}
 		return;
 	}
diff --git a/sys/dev/iir/iir.c b/sys/dev/iir/iir.c
index 057194a..4c907f0 100644
--- a/sys/dev/iir/iir.c
+++ b/sys/dev/iir/iir.c
@@ -794,6 +794,7 @@ gdt_raw_cmd(struct gdt_softc *gdt, union ccb *ccb, int *lock)
 {
     struct gdt_ccb *gccb;
     struct cam_sim *sim;
+    int error;
 
     GDT_DPRINTF(GDT_D_CMD, ("gdt_raw_cmd(%p, %p)\n", gdt, ccb));
 
@@ -844,51 +845,14 @@ gdt_raw_cmd(struct gdt_softc *gdt, union ccb *ccb, int *lock)
     gdt_enc32(gccb->gc_cmd + GDT_CMD_UNION + GDT_RAW_SENSE_DATA,
               gccb->gc_scratch_busbase);
  
-    /*
-     * If we have any data to send with this command,
-     * map it into bus space.
-     */
-    /* Only use S/G if there is a transfer */
-    if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-        if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) { 
-            if ((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-                int s;
-                int error;
-            
-                /* vorher unlock von splcam() ??? */
-                s = splsoftvm();
-                error =
-                    bus_dmamap_load(gdt->sc_buffer_dmat,
-                                    gccb->gc_dmamap,
-                                    ccb->csio.data_ptr,
-                                    ccb->csio.dxfer_len,
-                                    gdtexecuteccb,
-                                    gccb, /*flags*/0);
-                if (error == EINPROGRESS) {
-                    xpt_freeze_simq(sim, 1);
-                    gccb->gc_ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
-                }
-                splx(s);
-            } else {
-		panic("iir: CAM_DATA_PHYS not supported");
-            }
-        } else {
-            struct bus_dma_segment *segs;
-
-            if ((ccb->ccb_h.flags & CAM_DATA_PHYS) != 0)
-                panic("iir%d: iir_action - Physical "
-                      "segment pointers unsupported", gdt->sc_hanum);
-
-            if ((ccb->ccb_h.flags & CAM_SG_LIST_PHYS)==0)
-                panic("iir%d: iir_action - Virtual "
-                      "segment addresses unsupported", gdt->sc_hanum);
-
-            /* Just use the segments provided */
-            segs = (struct bus_dma_segment *)ccb->csio.data_ptr;
-            gdtexecuteccb(gccb, segs, ccb->csio.sglist_cnt, 0);
-        }
-    } else {
-        gdtexecuteccb(gccb, NULL, 0, 0);
+    error = bus_dmamap_load_ccb(gdt->sc_buffer_dmat,
+			        gccb->gc_dmamap,
+			        ccb,
+			        gdtexecuteccb,
+			        gccb, /*flags*/0);
+    if (error == EINPROGRESS) {
+        xpt_freeze_simq(sim, 1);
+        gccb->gc_ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
     }
 
     *lock = splcam();
@@ -903,6 +867,7 @@ gdt_cache_cmd(struct gdt_softc *gdt, union ccb *ccb, int *lock)
     u_int8_t *cmdp;
     u_int16_t opcode;
     u_int32_t blockno, blockcnt;
+    int error;
 
     GDT_DPRINTF(GDT_D_CMD, ("gdt_cache_cmd(%p, %p)\n", gdt, ccb));
 
@@ -953,49 +918,15 @@ gdt_cache_cmd(struct gdt_softc *gdt, union ccb *ccb, int *lock)
     gdt_enc32(gccb->gc_cmd + GDT_CMD_UNION + GDT_CACHE_BLOCKCNT,
               blockcnt);
 
-    /*
-     * If we have any data to send with this command,
-     * map it into bus space.
-     */
-    /* Only use S/G if there is a transfer */
-    if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) { 
-        if ((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-            int s;
-            int error;
-            
-            /* vorher unlock von splcam() ??? */
-            s = splsoftvm();
-            error =
-                bus_dmamap_load(gdt->sc_buffer_dmat,
+    error = bus_dmamap_load_ccb(gdt->sc_buffer_dmat,
                                 gccb->gc_dmamap,
-                                ccb->csio.data_ptr,
-                                ccb->csio.dxfer_len,
+                                ccb,
                                 gdtexecuteccb,
                                 gccb, /*flags*/0);
-            if (error == EINPROGRESS) {
-                xpt_freeze_simq(sim, 1);
-                gccb->gc_ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
-            }
-            splx(s);
-        } else {
-	    panic("iir: CAM_DATA_PHYS not supported");
-        }
-    } else {
-        struct bus_dma_segment *segs;
-
-        if ((ccb->ccb_h.flags & CAM_DATA_PHYS) != 0)
-            panic("iir%d: iir_action - Physical "
-                  "segment pointers unsupported", gdt->sc_hanum);
-
-        if ((ccb->ccb_h.flags & CAM_SG_LIST_PHYS)==0)
-            panic("iir%d: iir_action - Virtual "
-                  "segment addresses unsupported", gdt->sc_hanum);
-
-        /* Just use the segments provided */
-        segs = (struct bus_dma_segment *)ccb->csio.data_ptr;
-        gdtexecuteccb(gccb, segs, ccb->csio.sglist_cnt, 0);
+    if (error == EINPROGRESS) {
+        xpt_freeze_simq(sim, 1);
+        gccb->gc_ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
     }
-
     *lock = splcam();
     return (gccb);
 }
diff --git a/sys/dev/isci/isci_io_request.c b/sys/dev/isci/isci_io_request.c
index 719034e..9778ed0 100644
--- a/sys/dev/isci/isci_io_request.c
+++ b/sys/dev/isci/isci_io_request.c
@@ -713,7 +713,6 @@ void
 isci_io_request_execute_scsi_io(union ccb *ccb,
     struct ISCI_CONTROLLER *controller)
 {
-	struct ccb_scsiio *csio = &ccb->csio;
 	target_id_t target_id = ccb->ccb_h.target_id;
 	struct ISCI_REQUEST *request;
 	struct ISCI_IO_REQUEST *io_request;
@@ -748,29 +747,21 @@ isci_io_request_execute_scsi_io(union ccb *ccb,
 	io_request->current_sge_index = 0;
 	io_request->parent.remote_device_handle = device->sci_object;
 
-	if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) != 0)
-		panic("Unexpected CAM_SCATTER_VALID flag!  flags = 0x%x\n",
+	if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
+		panic("Unexpected cam data format!  flags = 0x%x\n",
 		    ccb->ccb_h.flags);
 
-	if ((ccb->ccb_h.flags & CAM_DATA_PHYS) != 0)
-		panic("Unexpected CAM_DATA_PHYS flag!  flags = 0x%x\n",
-		    ccb->ccb_h.flags);
-
-	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		error = bus_dmamap_load(io_request->parent.dma_tag,
-		    io_request->parent.dma_map, csio->data_ptr, csio->dxfer_len,
-		    isci_io_request_construct, io_request, 0x0);
-
-		/* A resource shortage from BUSDMA will be automatically
-		 * continued at a later point, pushing the CCB processing
-		 * forward, which will in turn unfreeze the simq.
-		 */
-		if (error == EINPROGRESS) {
-			xpt_freeze_simq(controller->sim, 1);
-			ccb->ccb_h.flags |= CAM_RELEASE_SIMQ;
-		}
-	} else
-		isci_io_request_construct(io_request, NULL, 0, 0);
+	error = bus_dmamap_load_ccb(io_request->parent.dma_tag,
+	    io_request->parent.dma_map, ccb,
+	    isci_io_request_construct, io_request, 0x0);
+	/* A resource shortage from BUSDMA will be automatically
+	 * continued at a later point, pushing the CCB processing
+	 * forward, which will in turn unfreeze the simq.
+	 */
+	if (error == EINPROGRESS) {
+		xpt_freeze_simq(controller->sim, 1);
+		ccb->ccb_h.flags |= CAM_RELEASE_SIMQ;
+	}
 }
 
 void
diff --git a/sys/dev/isp/isp_pci.c b/sys/dev/isp/isp_pci.c
index e0260d4..795f432 100644
--- a/sys/dev/isp/isp_pci.c
+++ b/sys/dev/isp/isp_pci.c
@@ -1922,6 +1922,7 @@ isp_pci_dmasetup(ispsoftc_t *isp, struct ccb_scsiio *csio, void *ff)
 	mush_t mush, *mp;
 	void (*eptr)(void *, bus_dma_segment_t *, int, int);
 	void (*eptr2)(void *, bus_dma_segment_t *, int, bus_size_t, int);
+	int error;
 
 	mp = &mush;
 	mp->isp = isp;
@@ -1942,70 +1943,17 @@ isp_pci_dmasetup(ispsoftc_t *isp, struct ccb_scsiio *csio, void *ff)
 	}
 
 
-	if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE || (csio->dxfer_len == 0)) {
-		(*eptr)(mp, NULL, 0, 0);
-	} else if ((csio->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
-		if ((csio->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-			int error;
-			error = bus_dmamap_load(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap, csio->data_ptr, csio->dxfer_len, eptr, mp, 0);
-#if 0
-			xpt_print(csio->ccb_h.path, "%s: bus_dmamap_load " "ptr %p len %d returned %d\n", __func__, csio->data_ptr, csio->dxfer_len, error);
-#endif
-
-			if (error == EINPROGRESS) {
-				bus_dmamap_unload(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap);
-				mp->error = EINVAL;
-				isp_prt(isp, ISP_LOGERR, "deferred dma allocation not supported");
-			} else if (error && mp->error == 0) {
+	error = bus_dmamap_load_ccb(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap,
+	    (union ccb *)csio, eptr, mp, 0);
+	if (error == EINPROGRESS) {
+		bus_dmamap_unload(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap);
+		mp->error = EINVAL;
+		isp_prt(isp, ISP_LOGERR, "deferred dma allocation not supported");
+	} else if (error && mp->error == 0) {
 #ifdef	DIAGNOSTIC
-				isp_prt(isp, ISP_LOGERR, "error %d in dma mapping code", error);
+		isp_prt(isp, ISP_LOGERR, "error %d in dma mapping code", error);
 #endif
-				mp->error = error;
-			}
-		} else {
-			/* Pointer to physical buffer */
-			struct bus_dma_segment seg;
-			seg.ds_addr = (bus_addr_t)(vm_offset_t)csio->data_ptr;
-			seg.ds_len = csio->dxfer_len;
-			(*eptr)(mp, &seg, 1, 0);
-		}
-	} else {
-		struct bus_dma_segment *segs;
-
-		if ((csio->ccb_h.flags & CAM_DATA_PHYS) != 0) {
-			isp_prt(isp, ISP_LOGERR, "Physical segment pointers unsupported");
-			mp->error = EINVAL;
-		} else if ((csio->ccb_h.flags & CAM_SG_LIST_PHYS) == 0) {
-			struct uio sguio;
-			int error;
-
-			/*
-			 * We're taking advantage of the fact that
-			 * the pointer/length sizes and layout of the iovec
-			 * structure are the same as the bus_dma_segment
-			 * structure.  This might be a little dangerous,
-			 * but only if they change the structures, which
-			 * seems unlikely.
-			 */
-			KASSERT((sizeof (sguio.uio_iov) == sizeof (csio->data_ptr) &&
-			    sizeof (sguio.uio_iovcnt) >= sizeof (csio->sglist_cnt) &&
-			    sizeof (sguio.uio_resid) >= sizeof (csio->dxfer_len)), ("Ken's assumption failed"));
-			sguio.uio_iov = (struct iovec *)csio->data_ptr;
-			sguio.uio_iovcnt = csio->sglist_cnt;
-			sguio.uio_resid = csio->dxfer_len;
-			sguio.uio_segflg = UIO_SYSSPACE;
-
-			error = bus_dmamap_load_uio(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap, &sguio, eptr2, mp, 0);
-
-			if (error != 0 && mp->error == 0) {
-				isp_prt(isp, ISP_LOGERR, "error %d in dma mapping code", error);
-				mp->error = error;
-			}
-		} else {
-			/* Just use the segments provided */
-			segs = (struct bus_dma_segment *) csio->data_ptr;
-			(*eptr)(mp, segs, csio->sglist_cnt, 0);
-		}
+		mp->error = error;
 	}
 	if (mp->error) {
 		int retval = CMD_COMPLETE;
diff --git a/sys/dev/isp/isp_sbus.c b/sys/dev/isp/isp_sbus.c
index 0b4f63f..9afcc8e 100644
--- a/sys/dev/isp/isp_sbus.c
+++ b/sys/dev/isp/isp_sbus.c
@@ -635,6 +635,7 @@ isp_sbus_dmasetup(ispsoftc_t *isp, struct ccb_scsiio *csio, void *ff)
 {
 	mush_t mush, *mp;
 	void (*eptr)(void *, bus_dma_segment_t *, int, int);
+	int error;
 
 	mp = &mush;
 	mp->isp = isp;
@@ -645,47 +646,18 @@ isp_sbus_dmasetup(ispsoftc_t *isp, struct ccb_scsiio *csio, void *ff)
 
 	eptr = dma2;
 
-	if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE || (csio->dxfer_len == 0)) {
-		(*eptr)(mp, NULL, 0, 0);
-	} else if ((csio->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
-		if ((csio->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-			int error;
-			error = bus_dmamap_load(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap, csio->data_ptr, csio->dxfer_len, eptr, mp, 0);
-#if 0
-			xpt_print(csio->ccb_h.path, "%s: bus_dmamap_load " "ptr %p len %d returned %d\n", __func__, csio->data_ptr, csio->dxfer_len, error);
-#endif
-
-			if (error == EINPROGRESS) {
-				bus_dmamap_unload(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap);
-				mp->error = EINVAL;
-				isp_prt(isp, ISP_LOGERR, "deferred dma allocation not supported");
-			} else if (error && mp->error == 0) {
+	error = bus_dmamap_load_ccb(isp->isp_osinfo.dmat,
+	    PISP_PCMD(csio)->dmap, (union ccb *)csio, eptr, mp, 0);
+	if (error == EINPROGRESS) {
+		bus_dmamap_unload(isp->isp_osinfo.dmat, PISP_PCMD(csio)->dmap);
+		mp->error = EINVAL;
+		isp_prt(isp, ISP_LOGERR,
+		    "deferred dma allocation not supported");
+	} else if (error && mp->error == 0) {
 #ifdef	DIAGNOSTIC
-				isp_prt(isp, ISP_LOGERR, "error %d in dma mapping code", error);
+		isp_prt(isp, ISP_LOGERR, "error %d in dma mapping code", error);
 #endif
-				mp->error = error;
-			}
-		} else {
-			/* Pointer to physical buffer */
-			struct bus_dma_segment seg;
-			seg.ds_addr = (bus_addr_t)(vm_offset_t)csio->data_ptr;
-			seg.ds_len = csio->dxfer_len;
-			(*eptr)(mp, &seg, 1, 0);
-		}
-	} else {
-		struct bus_dma_segment *segs;
-
-		if ((csio->ccb_h.flags & CAM_DATA_PHYS) != 0) {
-			isp_prt(isp, ISP_LOGERR, "Physical segment pointers unsupported");
-			mp->error = EINVAL;
-		} else if ((csio->ccb_h.flags & CAM_SG_LIST_PHYS) == 0) {
-			isp_prt(isp, ISP_LOGERR, "Physical SG/LIST Phys segment pointers unsupported");
-			mp->error = EINVAL;
-		} else {
-			/* Just use the segments provided */
-			segs = (struct bus_dma_segment *) csio->data_ptr;
-			(*eptr)(mp, segs, csio->sglist_cnt, 0);
-		}
+		mp->error = error;
 	}
 	if (mp->error) {
 		int retval = CMD_COMPLETE;
diff --git a/sys/dev/mfi/mfi.c b/sys/dev/mfi/mfi.c
index 7cb19d2..ed759fc 100644
--- a/sys/dev/mfi/mfi.c
+++ b/sys/dev/mfi/mfi.c
@@ -2267,8 +2267,14 @@ mfi_mapcmd(struct mfi_softc *sc, struct mfi_command *cm)
 
 	if ((cm->cm_data != NULL) && (cm->cm_frame->header.cmd != MFI_CMD_STP )) {
 		polled = (cm->cm_flags & MFI_CMD_POLLED) ? BUS_DMA_NOWAIT : 0;
-		error = bus_dmamap_load(sc->mfi_buffer_dmat, cm->cm_dmamap,
-		    cm->cm_data, cm->cm_len, mfi_data_cb, cm, polled);
+		if (cm->cm_flags & MFI_CMD_CCB)
+			error = bus_dmamap_load_ccb(sc->mfi_buffer_dmat,
+			    cm->cm_dmamap, cm->cm_data, mfi_data_cb, cm,
+			    polled);
+		else
+			error = bus_dmamap_load(sc->mfi_buffer_dmat,
+			    cm->cm_dmamap, cm->cm_data, cm->cm_len,
+			    mfi_data_cb, cm, polled);
 		if (error == EINPROGRESS) {
 			sc->mfi_flags |= MFI_FLAGS_QFRZN;
 			return (0);
diff --git a/sys/dev/mfi/mfi_cam.c b/sys/dev/mfi/mfi_cam.c
index 2bbfafe..325b064 100644
--- a/sys/dev/mfi/mfi_cam.c
+++ b/sys/dev/mfi/mfi_cam.c
@@ -265,17 +265,6 @@ mfip_cam_action(struct cam_sim *sim, union ccb *ccb)
 			ccbh->status = CAM_REQ_INVALID;
 			break;
 		}
-		if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-			if (ccbh->flags & CAM_DATA_PHYS) {
-				ccbh->status = CAM_REQ_INVALID;
-				break;
-			}
-			if (ccbh->flags & CAM_SCATTER_VALID) {
-				ccbh->status = CAM_REQ_INVALID;
-				break;
-			}
-		}
-
 		ccbh->ccb_mfip_ptr = sc;
 		TAILQ_INSERT_TAIL(&mfisc->mfi_cam_ccbq, ccbh, sim_links.tqe);
 		mfi_startio(mfisc);
@@ -380,14 +369,14 @@ mfip_start(void *data)
 	cm->cm_private = ccb;
 	cm->cm_sg = &pt->sgl;
 	cm->cm_total_frame_size = MFI_PASS_FRAME_SIZE;
-	cm->cm_data = csio->data_ptr;
+	cm->cm_data = ccb;
 	cm->cm_len = csio->dxfer_len;
 	switch (ccbh->flags & CAM_DIR_MASK) {
 	case CAM_DIR_IN:
-		cm->cm_flags = MFI_CMD_DATAIN;
+		cm->cm_flags = MFI_CMD_DATAIN | MFI_CMD_CCB;
 		break;
 	case CAM_DIR_OUT:
-		cm->cm_flags = MFI_CMD_DATAOUT;
+		cm->cm_flags = MFI_CMD_DATAOUT | MFI_CMD_CCB;
 		break;
 	case CAM_DIR_NONE:
 	default:
diff --git a/sys/dev/mfi/mfivar.h b/sys/dev/mfi/mfivar.h
index 435ca8d..bb2a324 100644
--- a/sys/dev/mfi/mfivar.h
+++ b/sys/dev/mfi/mfivar.h
@@ -107,6 +107,7 @@ struct mfi_command {
 #define MFI_ON_MFIQ_BUSY	(1<<7)
 #define MFI_ON_MFIQ_MASK	((1<<5)|(1<<6)|(1<<7))
 #define MFI_CMD_SCSI		(1<<8)
+#define MFI_CMD_CCB		(1<<9)
 	uint8_t			retry_for_fw_reset;
 	void			(* cm_complete)(struct mfi_command *cm);
 	void			*cm_private;
diff --git a/sys/dev/mly/mly.c b/sys/dev/mly/mly.c
index 1f0a9e2..9155d60 100644
--- a/sys/dev/mly/mly.c
+++ b/sys/dev/mly/mly.c
@@ -1864,9 +1864,13 @@ mly_map_command(struct mly_command *mc)
 
     /* does the command have a data buffer? */
     if (mc->mc_data != NULL) {
-	bus_dmamap_load(sc->mly_buffer_dmat, mc->mc_datamap, mc->mc_data, mc->mc_length, 
-			mly_map_command_sg, mc, 0);
-	
+	if (mc->mc_flags & MLY_CMD_CCB)
+		bus_dmamap_load_ccb(sc->mly_buffer_dmat, mc->mc_datamap,
+				mc->mc_data, mly_map_command_sg, mc, 0);
+	else 
+		bus_dmamap_load(sc->mly_buffer_dmat, mc->mc_datamap,
+				mc->mc_data, mc->mc_length, 
+				mly_map_command_sg, mc, 0);
 	if (mc->mc_flags & MLY_CMD_DATAIN)
 	    bus_dmamap_sync(sc->mly_buffer_dmat, mc->mc_datamap, BUS_DMASYNC_PREREAD);
 	if (mc->mc_flags & MLY_CMD_DATAOUT)
@@ -2220,18 +2224,6 @@ mly_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
 	csio->ccb_h.status = CAM_REQ_CMP_ERR;
     }
 
-    /* if there is data transfer, it must be to/from a virtual address */
-    if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-	if (csio->ccb_h.flags & CAM_DATA_PHYS) {		/* we can't map it */
-	    debug(0, "  data pointer is to physical address");
-	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
-	}
-	if (csio->ccb_h.flags & CAM_SCATTER_VALID) {	/* we want to do the s/g setup */
-	    debug(0, "  data has premature s/g setup");
-	    csio->ccb_h.status = CAM_REQ_CMP_ERR;
-	}
-    }
-
     /* abandon aborted ccbs or those that have failed validation */
     if ((csio->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
 	debug(2, "abandoning CCB due to abort/validation failure");
@@ -2251,10 +2243,12 @@ mly_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
     }
     
     /* build the command */
-    mc->mc_data = csio->data_ptr;
+    mc->mc_data = csio;
     mc->mc_length = csio->dxfer_len;
     mc->mc_complete = mly_cam_complete;
     mc->mc_private = csio;
+    mc->mc_flags |= MLY_CMD_CCB;
+    /* XXX This code doesn't set the data direction in mc_flags. */
 
     /* save the bus number in the ccb for later recovery XXX should be a better way */
      csio->ccb_h.sim_priv.entries[0].field = bus;
diff --git a/sys/dev/mly/mlyvar.h b/sys/dev/mly/mlyvar.h
index 62e674c..7413fa4 100644
--- a/sys/dev/mly/mlyvar.h
+++ b/sys/dev/mly/mlyvar.h
@@ -126,6 +126,7 @@ struct mly_command {
 #define MLY_CMD_MAPPED		(1<<3)		/* command has had its data mapped */
 #define MLY_CMD_DATAIN		(1<<4)		/* data moves controller->system */
 #define MLY_CMD_DATAOUT		(1<<5)		/* data moves system->controller */
+#define MLY_CMD_CCB		(1<<6)		/* data is ccb. */
     u_int16_t			mc_status;	/* command completion status */
     u_int8_t			mc_sense;	/* sense data length */
     int32_t			mc_resid;	/* I/O residual count */
diff --git a/sys/dev/mps/mps.c b/sys/dev/mps/mps.c
index ce94a06..7a3e4f7 100644
--- a/sys/dev/mps/mps.c
+++ b/sys/dev/mps/mps.c
@@ -2278,6 +2278,9 @@ mps_map_command(struct mps_softc *sc, struct mps_command *cm)
 	if (cm->cm_flags & MPS_CM_FLAGS_USE_UIO) {
 		error = bus_dmamap_load_uio(sc->buffer_dmat, cm->cm_dmamap,
 		    &cm->cm_uio, mps_data_cb2, cm, 0);
+	} else if (cm->cm_flags & MPS_CM_FLAGS_USE_CCB) {
+		error = bus_dmamap_load_ccb(sc->buffer_dmat, cm->cm_dmamap,
+		    cm->cm_data, mps_data_cb, cm, 0);
 	} else if ((cm->cm_data != NULL) && (cm->cm_length != 0)) {
 		error = bus_dmamap_load(sc->buffer_dmat, cm->cm_dmamap,
 		    cm->cm_data, cm->cm_length, mps_data_cb, cm, 0);
diff --git a/sys/dev/mps/mps_sas.c b/sys/dev/mps/mps_sas.c
index a76a0aa..0d8342e 100644
--- a/sys/dev/mps/mps_sas.c
+++ b/sys/dev/mps/mps_sas.c
@@ -1755,8 +1755,13 @@ mpssas_action_scsiio(struct mpssas_softc *sassc, union ccb *ccb)
 		}
 	}
 
-	cm->cm_data = csio->data_ptr;
 	cm->cm_length = csio->dxfer_len;
+	if (cm->cm_length != 0) {
+		cm->cm_data = ccb;
+		cm->cm_flags |= MPS_CM_FLAGS_USE_CCB;
+	} else {
+		cm->cm_data = NULL;
+	}
 	cm->cm_sge = &req->SGL;
 	cm->cm_sglsize = (32 - 24) * 4;
 	cm->cm_desc.SCSIIO.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
@@ -2691,19 +2696,15 @@ mpssas_send_smpcmd(struct mpssas_softc *sassc, union ccb *ccb, uint64_t sasaddr)
 	/*
 	 * XXX We don't yet support physical addresses here.
 	 */
-	if (ccb->ccb_h.flags & (CAM_DATA_PHYS|CAM_SG_LIST_PHYS)) {
+	switch ((ccb->ccb_h.flags & CAM_DATA_MASK)) {
+	case CAM_DATA_PADDR:
+	case CAM_DATA_SG_PADDR:
 		mps_printf(sc, "%s: physical addresses not supported\n",
 			   __func__);
 		ccb->ccb_h.status = CAM_REQ_INVALID;
 		xpt_done(ccb);
 		return;
-	}
-
-	/*
-	 * If the user wants to send an S/G list, check to make sure they
-	 * have single buffers.
-	 */
-	if (ccb->ccb_h.flags & CAM_SCATTER_VALID) {
+	case CAM_DATA_SG:
 		/*
 		 * The chip does not support more than one buffer for the
 		 * request or response.
@@ -2741,9 +2742,15 @@ mpssas_send_smpcmd(struct mpssas_softc *sassc, union ccb *ccb, uint64_t sasaddr)
 			response = (uint8_t *)(uintptr_t)rsp_sg[0].ds_addr;
 		} else
 			response = ccb->smpio.smp_response;
-	} else {
+		break;
+	case CAM_DATA_VADDR:
 		request = ccb->smpio.smp_request;
 		response = ccb->smpio.smp_response;
+		break;
+	default:
+		ccb->ccb_h.status = CAM_REQ_INVALID;
+		xpt_done(ccb);
+		return;
 	}
 
 	cm = mps_alloc_command(sc);
diff --git a/sys/dev/mps/mpsvar.h b/sys/dev/mps/mpsvar.h
index ac0f0da..5d14b5f 100644
--- a/sys/dev/mps/mpsvar.h
+++ b/sys/dev/mps/mpsvar.h
@@ -231,6 +231,7 @@ struct mps_command {
 #define MPS_CM_FLAGS_SMP_PASS		(1 << 8)
 #define	MPS_CM_FLAGS_CHAIN_FAILED	(1 << 9)
 #define	MPS_CM_FLAGS_ERROR_MASK		MPS_CM_FLAGS_CHAIN_FAILED
+#define	MPS_CM_FLAGS_USE_CCB		(1 << 10)
 	u_int				cm_state;
 #define MPS_CM_STATE_FREE		0
 #define MPS_CM_STATE_BUSY		1
diff --git a/sys/dev/mpt/mpt_cam.c b/sys/dev/mpt/mpt_cam.c
index d435f77..119dd50 100644
--- a/sys/dev/mpt/mpt_cam.c
+++ b/sys/dev/mpt/mpt_cam.c
@@ -1382,7 +1382,7 @@ bad:
 		}
 	}
 
-	if (!(ccb->ccb_h.flags & (CAM_SG_LIST_PHYS|CAM_DATA_PHYS))) {
+	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
 		bus_dmasync_op_t op;
 		if (istgt == 0) {
 			if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
@@ -1623,7 +1623,7 @@ out:
 		mpt_prt(mpt,
 		    "mpt_execute_req_a64: I/O cancelled (status 0x%x)\n",
 		    ccb->ccb_h.status & CAM_STATUS_MASK);
-		if (nseg && (ccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0) {
+		if (nseg) {
 			bus_dmamap_unload(mpt->buffer_dmat, req->dmap);
 		}
 		ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
@@ -1785,7 +1785,7 @@ bad:
 		}
 	}
 
-	if (!(ccb->ccb_h.flags & (CAM_SG_LIST_PHYS|CAM_DATA_PHYS))) {
+	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
 		bus_dmasync_op_t op;
 		if (istgt) {
 			if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
@@ -2010,7 +2010,7 @@ out:
 		mpt_prt(mpt,
 		    "mpt_execute_req: I/O cancelled (status 0x%x)\n",
 		    ccb->ccb_h.status & CAM_STATUS_MASK);
-		if (nseg && (ccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0) {
+		if (nseg) {
 			bus_dmamap_unload(mpt->buffer_dmat, req->dmap);
 		}
 		ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
@@ -2062,6 +2062,7 @@ mpt_start(struct cam_sim *sim, union ccb *ccb)
 	bus_dmamap_callback_t *cb;
 	target_id_t tgt;
 	int raid_passthru;
+	int error;
 
 	/* Get the pointer for the physical addapter */
 	mpt = ccb->ccb_h.ccb_mpt_ptr;
@@ -2206,64 +2207,15 @@ mpt_start(struct cam_sim *sim, union ccb *ccb)
 		    ccb->ccb_h.target_lun, req, req->serno);
 	}
 
-	/*
-	 * If we have any data to send with this command map it into bus space.
-	 */
-	if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
-			/*
-			 * We've been given a pointer to a single buffer.
-			 */
-			if ((ccbh->flags & CAM_DATA_PHYS) == 0) {
-				/*
-				 * Virtual address that needs to translated into
-				 * one or more physical address ranges.
-				 */
-				int error;
-				int s = splsoftvm();
-				error = bus_dmamap_load(mpt->buffer_dmat,
-				    req->dmap, csio->data_ptr, csio->dxfer_len,
-				    cb, req, 0);
-				splx(s);
-				if (error == EINPROGRESS) {
-					/*
-					 * So as to maintain ordering,
-					 * freeze the controller queue
-					 * until our mapping is
-					 * returned.
-					 */
-					xpt_freeze_simq(mpt->sim, 1);
-					ccbh->status |= CAM_RELEASE_SIMQ;
-				}
-			} else {
-				/*
-				 * We have been given a pointer to single
-				 * physical buffer.
-				 */
-				struct bus_dma_segment seg;
-				seg.ds_addr = 
-				    (bus_addr_t)(vm_offset_t)csio->data_ptr;
-				seg.ds_len = csio->dxfer_len;
-				(*cb)(req, &seg, 1, 0);
-			}
-		} else {
-			/*
-			 * We have been given a list of addresses.
-			 * This case could be easily supported but they are not
-			 * currently generated by the CAM subsystem so there
-			 * is no point in wasting the time right now.
-			 */
-			struct bus_dma_segment *segs;
-			if ((ccbh->flags & CAM_SG_LIST_PHYS) == 0) {
-				(*cb)(req, NULL, 0, EFAULT);
-			} else {
-				/* Just use the segments provided */
-				segs = (struct bus_dma_segment *)csio->data_ptr;
-				(*cb)(req, segs, csio->sglist_cnt, 0);
-			}
-		}
-	} else {
-		(*cb)(req, NULL, 0, 0);
+	error = bus_dmamap_load_ccb(mpt->buffer_dmat, req->dmap, ccb, cb,
+	    req, 0);
+	if (error == EINPROGRESS) {
+		/*
+		 * So as to maintain ordering, freeze the controller queue
+		 * until our mapping is returned.
+		 */
+		xpt_freeze_simq(mpt->sim, 1);
+		ccbh->status |= CAM_RELEASE_SIMQ;
 	}
 }
 
@@ -4458,6 +4410,7 @@ mpt_target_start_io(struct mpt_softc *mpt, union ccb *ccb)
 		bus_dmamap_callback_t *cb;
 		PTR_MSG_TARGET_ASSIST_REQUEST ta;
 		request_t *req;
+		int error;
 
 		KASSERT((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE,
 		    ("dxfer_len %u but direction is NONE", csio->dxfer_len));
@@ -4544,44 +4497,11 @@ mpt_target_start_io(struct mpt_softc *mpt, union ccb *ccb)
 		    "nxtstate=%d\n", csio, csio->tag_id, csio->dxfer_len,
 		    tgt->resid, ccb->ccb_h.flags, req, req->serno, tgt->state);
 
-		if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) == 0) {
-			if ((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) {
-				int error;
-				int s = splsoftvm();
-				error = bus_dmamap_load(mpt->buffer_dmat,
-				    req->dmap, csio->data_ptr, csio->dxfer_len,
-				    cb, req, 0);
-				splx(s);
-				if (error == EINPROGRESS) {
-					xpt_freeze_simq(mpt->sim, 1);
-					ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
-				}
-			} else {
-				/*
-				 * We have been given a pointer to single
-				 * physical buffer.
-				 */
-				struct bus_dma_segment seg;
-				seg.ds_addr = (bus_addr_t)
-				    (vm_offset_t)csio->data_ptr;
-				seg.ds_len = csio->dxfer_len;
-				(*cb)(req, &seg, 1, 0);
-			}
-		} else {
-			/*
-			 * We have been given a list of addresses.
-			 * This case could be easily supported but they are not
-			 * currently generated by the CAM subsystem so there
-			 * is no point in wasting the time right now.
-			 */
-			struct bus_dma_segment *sgs;
-			if ((ccb->ccb_h.flags & CAM_SG_LIST_PHYS) == 0) {
-				(*cb)(req, NULL, 0, EFAULT);
-			} else {
-				/* Just use the segments provided */
-				sgs = (struct bus_dma_segment *)csio->data_ptr;
-				(*cb)(req, sgs, csio->sglist_cnt, 0);
-			}
+		error = bus_dmamap_load_ccb(mpt->buffer_dmat, req->dmap, ccb,
+		    cb, req, 0);
+		if (error == EINPROGRESS) {
+			xpt_freeze_simq(mpt->sim, 1);
+			ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
 		}
 	} else {
 		uint8_t *sp = NULL, sense[MPT_SENSE_SIZE];
diff --git a/sys/dev/mvs/mvs.c b/sys/dev/mvs/mvs.c
index 21c9f97..91ca4f0 100644
--- a/sys/dev/mvs/mvs.c
+++ b/sys/dev/mvs/mvs.c
@@ -1260,19 +1260,9 @@ mvs_begin_transaction(device_t dev, union ccb *ccb)
 		mvs_set_edma_mode(dev, MVS_EDMA_OFF);
 	}
 	if (ch->numpslots == 0 || ch->basic_dma) {
-		void *buf;
-		bus_size_t size;
-
 		slot->state = MVS_SLOT_LOADING;
-		if (ccb->ccb_h.func_code == XPT_ATA_IO) {
-			buf = ccb->ataio.data_ptr;
-			size = ccb->ataio.dxfer_len;
-		} else {
-			buf = ccb->csio.data_ptr;
-			size = ccb->csio.dxfer_len;
-		}
-		bus_dmamap_load(ch->dma.data_tag, slot->dma.data_map,
-		    buf, size, mvs_dmasetprd, slot, 0);
+		bus_dmamap_load_ccb(ch->dma.data_tag, slot->dma.data_map,
+		    ccb, mvs_dmasetprd, slot, 0);
 	} else
 		mvs_legacy_execute_transaction(slot);
 }
diff --git a/sys/dev/siis/siis.c b/sys/dev/siis/siis.c
index a8a1ed2..fb88664 100644
--- a/sys/dev/siis/siis.c
+++ b/sys/dev/siis/siis.c
@@ -996,19 +996,9 @@ siis_begin_transaction(device_t dev, union ccb *ccb)
 	slot->dma.nsegs = 0;
 	/* If request moves data, setup and load SG list */
 	if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
-		void *buf;
-		bus_size_t size;
-
 		slot->state = SIIS_SLOT_LOADING;
-		if (ccb->ccb_h.func_code == XPT_ATA_IO) {
-			buf = ccb->ataio.data_ptr;
-			size = ccb->ataio.dxfer_len;
-		} else {
-			buf = ccb->csio.data_ptr;
-			size = ccb->csio.dxfer_len;
-		}
-		bus_dmamap_load(ch->dma.data_tag, slot->dma.data_map,
-		    buf, size, siis_dmasetprd, slot, 0);
+		bus_dmamap_load_ccb(ch->dma.data_tag, slot->dma.data_map,
+		    ccb, siis_dmasetprd, slot, 0);
 	} else
 		siis_execute_transaction(slot);
 }
@@ -1032,24 +1022,26 @@ siis_dmasetprd(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 		return;
 	}
 	KASSERT(nsegs <= SIIS_SG_ENTRIES, ("too many DMA segment entries\n"));
-	/* Get a piece of the workspace for this request */
-	ctp = (struct siis_cmd *)
-		(ch->dma.work + SIIS_CT_OFFSET + (SIIS_CT_SIZE * slot->slot));
-	/* Fill S/G table */
-	if (slot->ccb->ccb_h.func_code == XPT_ATA_IO) 
-		prd = &ctp->u.ata.prd[0];
-	else
-		prd = &ctp->u.atapi.prd[0];
-	for (i = 0; i < nsegs; i++) {
-		prd[i].dba = htole64(segs[i].ds_addr);
-		prd[i].dbc = htole32(segs[i].ds_len);
-		prd[i].control = 0;
-	}
-	prd[nsegs - 1].control = htole32(SIIS_PRD_TRM);
 	slot->dma.nsegs = nsegs;
-	bus_dmamap_sync(ch->dma.data_tag, slot->dma.data_map,
-	    ((slot->ccb->ccb_h.flags & CAM_DIR_IN) ?
-	    BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE));
+	if (nsegs != 0) {
+		/* Get a piece of the workspace for this request */
+		ctp = (struct siis_cmd *)(ch->dma.work + SIIS_CT_OFFSET +
+		    (SIIS_CT_SIZE * slot->slot));
+		/* Fill S/G table */
+		if (slot->ccb->ccb_h.func_code == XPT_ATA_IO) 
+			prd = &ctp->u.ata.prd[0];
+		else
+			prd = &ctp->u.atapi.prd[0];
+		for (i = 0; i < nsegs; i++) {
+			prd[i].dba = htole64(segs[i].ds_addr);
+			prd[i].dbc = htole32(segs[i].ds_len);
+			prd[i].control = 0;
+		}
+			prd[nsegs - 1].control = htole32(SIIS_PRD_TRM);
+		bus_dmamap_sync(ch->dma.data_tag, slot->dma.data_map,
+		    ((slot->ccb->ccb_h.flags & CAM_DIR_IN) ?
+		    BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE));
+	}
 	siis_execute_transaction(slot);
 }
 
diff --git a/sys/dev/sym/sym_hipd.c b/sys/dev/sym/sym_hipd.c
index 7d0450c..68ad77f 100644
--- a/sys/dev/sym/sym_hipd.c
+++ b/sys/dev/sym/sym_hipd.c
@@ -7877,51 +7877,15 @@ sym_setup_data_and_start(hcb_p np, struct ccb_scsiio *csio, ccb_p cp)
 		return;
 	}
 
-	if (!(ccb_h->flags & CAM_SCATTER_VALID)) {
-		/* Single buffer */
-		if (!(ccb_h->flags & CAM_DATA_PHYS)) {
-			/* Buffer is virtual */
-			cp->dmamapped = (dir == CAM_DIR_IN) ?
-						SYM_DMA_READ : SYM_DMA_WRITE;
-			retv = bus_dmamap_load(np->data_dmat, cp->dmamap,
-					       csio->data_ptr, csio->dxfer_len,
-					       sym_execute_ccb, cp, 0);
-			if (retv == EINPROGRESS) {
-				cp->host_status	= HS_WAIT;
-				xpt_freeze_simq(np->sim, 1);
-				csio->ccb_h.status |= CAM_RELEASE_SIMQ;
-			}
-		} else {
-			/* Buffer is physical */
-			struct bus_dma_segment seg;
-
-			seg.ds_addr = (bus_addr_t) csio->data_ptr;
-			sym_execute_ccb(cp, &seg, 1, 0);
-		}
-	} else {
-		/* Scatter/gather list */
-		struct bus_dma_segment *segs;
-
-		if ((ccb_h->flags & CAM_SG_LIST_PHYS) != 0) {
-			/* The SG list pointer is physical */
-			sym_set_cam_status(cp->cam_ccb, CAM_REQ_INVALID);
-			goto out_abort;
-		}
-
-		if (!(ccb_h->flags & CAM_DATA_PHYS)) {
-			/* SG buffer pointers are virtual */
-			sym_set_cam_status(cp->cam_ccb, CAM_REQ_INVALID);
-			goto out_abort;
-		}
-
-		/* SG buffer pointers are physical */
-		segs  = (struct bus_dma_segment *)csio->data_ptr;
-		sym_execute_ccb(cp, segs, csio->sglist_cnt, 0);
+	cp->dmamapped = (dir == CAM_DIR_IN) ?  SYM_DMA_READ : SYM_DMA_WRITE;
+	retv = bus_dmamap_load_ccb(np->data_dmat, cp->dmamap,
+			       (union ccb *)csio, sym_execute_ccb, cp, 0);
+	if (retv == EINPROGRESS) {
+		cp->host_status	= HS_WAIT;
+		xpt_freeze_simq(np->sim, 1);
+		csio->ccb_h.status |= CAM_RELEASE_SIMQ;
 	}
 	return;
-out_abort:
-	sym_xpt_done(np, (union ccb *) csio, cp);
-	sym_free_ccb(np, cp);
 }
 
 /*
diff --git a/sys/dev/trm/trm.c b/sys/dev/trm/trm.c
index 765d5ea..6032798 100644
--- a/sys/dev/trm/trm.c
+++ b/sys/dev/trm/trm.c
@@ -559,6 +559,7 @@ trm_action(struct cam_sim *psim, union ccb *pccb)
 			PDCB			pDCB = NULL;
 			PSRB			pSRB;
 			struct ccb_scsiio	*pcsio;
+			int			error;
      
 			pcsio = &pccb->csio;
 			TRM_DPRINTF(" XPT_SCSI_IO \n");
@@ -614,71 +615,18 @@ trm_action(struct cam_sim *psim, union ccb *pccb)
 			} else
 				bcopy(pcsio->cdb_io.cdb_bytes,
 				    pSRB->CmdBlock, pcsio->cdb_len);
-			if ((pccb->ccb_h.flags & CAM_DIR_MASK)
-			    != CAM_DIR_NONE) {
-				if ((pccb->ccb_h.flags &
-				      CAM_SCATTER_VALID) == 0) {
-					if ((pccb->ccb_h.flags 
-					      & CAM_DATA_PHYS) == 0) {
-						int vmflags;
-						int error;
-
-						vmflags = splsoftvm();
-						error = bus_dmamap_load(
-						    pACB->buffer_dmat,
+			error = bus_dmamap_load_ccb(pACB->buffer_dmat,
 						    pSRB->dmamap,
-						    pcsio->data_ptr,
-						    pcsio->dxfer_len,
+						    pccb,
 						    trm_ExecuteSRB,
 						    pSRB,
 						    0);
-						if (error == EINPROGRESS) {
-							xpt_freeze_simq(
-							    pACB->psim,
-							    1);
-							pccb->ccb_h.status |=
-							  CAM_RELEASE_SIMQ;
-						}
-						splx(vmflags);
-					} else {   
-						struct bus_dma_segment seg;
-
-						/* Pointer to physical buffer */
-						seg.ds_addr = 
-						  (bus_addr_t)pcsio->data_ptr;
-						seg.ds_len = pcsio->dxfer_len;
-						trm_ExecuteSRB(pSRB, &seg, 1,
-						    0);
-					}
-				} else { 
-					/*  CAM_SCATTER_VALID */
-					struct bus_dma_segment *segs;
-
-					if ((pccb->ccb_h.flags &
-					     CAM_SG_LIST_PHYS) == 0 ||
-					     (pccb->ccb_h.flags 
-					     & CAM_DATA_PHYS) != 0) {
-						pSRB->pNextSRB = pACB->pFreeSRB;
-						pACB->pFreeSRB = pSRB;
-						pccb->ccb_h.status = 
-						  CAM_PROVIDE_FAIL;
-						xpt_done(pccb);
-						splx(actionflags);
-						return;
-					}
-
-					/* cam SG list is physical,
-					 *  cam data is virtual 
-					 */
-					segs = (struct bus_dma_segment *)
-					    pcsio->data_ptr;
-					trm_ExecuteSRB(pSRB, segs,
-					    pcsio->sglist_cnt, 1);
-				}   /*  CAM_SCATTER_VALID */
-			} else
-				trm_ExecuteSRB(pSRB, NULL, 0, 0);
-				  }
+			if (error == EINPROGRESS) {
+				xpt_freeze_simq(pACB->psim, 1);
+				pccb->ccb_h.status |= CAM_RELEASE_SIMQ;
+			}
 			break;
+		}
 		case XPT_GDEV_TYPE:		    
 			TRM_DPRINTF(" XPT_GDEV_TYPE \n");
 	    		pccb->ccb_h.status = CAM_REQ_INVALID;
diff --git a/sys/dev/twa/tw_osl.h b/sys/dev/twa/tw_osl.h
index 50fa722..bed16cd 100644
--- a/sys/dev/twa/tw_osl.h
+++ b/sys/dev/twa/tw_osl.h
@@ -72,6 +72,7 @@
 #define TW_OSLI_REQ_FLAGS_PASSTHRU	(1<<5)	/* pass through request */
 #define TW_OSLI_REQ_FLAGS_SLEEPING	(1<<6)	/* owner sleeping on this cmd */
 #define TW_OSLI_REQ_FLAGS_FAILED	(1<<7)	/* bus_dmamap_load() failed */
+#define TW_OSLI_REQ_FLAGS_CCB		(1<<8)	/* req is ccb. */
 
 
 #ifdef TW_OSL_DEBUG
diff --git a/sys/dev/twa/tw_osl_cam.c b/sys/dev/twa/tw_osl_cam.c
index 2c2d5ae..9c4de23 100644
--- a/sys/dev/twa/tw_osl_cam.c
+++ b/sys/dev/twa/tw_osl_cam.c
@@ -261,55 +261,23 @@ tw_osli_execute_scsi(struct tw_osli_req_context *req, union ccb *ccb)
 		scsi_req->cdb = csio->cdb_io.cdb_bytes;
 	scsi_req->cdb_len = csio->cdb_len;
 
-	if (!(ccb_h->flags & CAM_DATA_PHYS)) {
-		/* Virtual data addresses.  Need to convert them... */
-		tw_osli_dbg_dprintf(3, sc,
-			"XPT_SCSI_IO: Single virtual address!");
-		if (!(ccb_h->flags & CAM_SCATTER_VALID)) {
-			if (csio->dxfer_len > TW_CL_MAX_IO_SIZE) {
-				tw_osli_printf(sc, "size = %d",
-					TW_CL_SEVERITY_ERROR_STRING,
-					TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
-					0x2106,
-					"I/O size too big",
-					csio->dxfer_len);
-				ccb_h->status = CAM_REQ_TOO_BIG;
-				ccb_h->status &= ~CAM_SIM_QUEUED;
-				xpt_done(ccb);
-				return(1);
-			}
-
-			if ((req->length = csio->dxfer_len)) {
-				req->data = csio->data_ptr;
-				scsi_req->sgl_entries = 1;
-			}
-		} else {
-			tw_osli_printf(sc, "",
-				TW_CL_SEVERITY_ERROR_STRING,
-				TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
-				0x2107,
-				"XPT_SCSI_IO: Got SGList");
-			ccb_h->status = CAM_REQ_INVALID;
-			ccb_h->status &= ~CAM_SIM_QUEUED;
-			xpt_done(ccb);
-			return(1);
-		}
-	} else {
-		/* Data addresses are physical. */
-		tw_osli_printf(sc, "",
+	if (csio->dxfer_len > TW_CL_MAX_IO_SIZE) {
+		tw_osli_printf(sc, "size = %d",
 			TW_CL_SEVERITY_ERROR_STRING,
 			TW_CL_MESSAGE_SOURCE_FREEBSD_DRIVER,
-			0x2108,
-			"XPT_SCSI_IO: Physical data addresses");
-		ccb_h->status = CAM_REQ_INVALID;
+			0x2106,
+			"I/O size too big",
+			csio->dxfer_len);
+		ccb_h->status = CAM_REQ_TOO_BIG;
 		ccb_h->status &= ~CAM_SIM_QUEUED;
 		xpt_done(ccb);
 		return(1);
 	}
-
+	req->data = ccb;
+	req->length = csio->dxfer_len;
+	req->flags |= TW_OSLI_REQ_FLAGS_CCB;
 	req->deadline = tw_osl_get_local_time() + (ccb_h->timeout / 1000);
 
-
 	/*
 	 * twa_map_load_data_callback will fill in the SGL,
 	 * and submit the I/O.
diff --git a/sys/dev/twa/tw_osl_freebsd.c b/sys/dev/twa/tw_osl_freebsd.c
index aedcfe8..2956df6 100644
--- a/sys/dev/twa/tw_osl_freebsd.c
+++ b/sys/dev/twa/tw_osl_freebsd.c
@@ -1473,6 +1473,10 @@ tw_osli_map_request(struct tw_osli_req_context *req)
 				twa_map_load_data_callback, req,
 				BUS_DMA_WAITOK);
 			mtx_unlock_spin(sc->io_lock);
+		} else if (req->flags & TW_OSLI_REQ_FLAGS_CCB) {
+			error = bus_dmamap_load_ccb(sc->dma_tag, req->dma_map,
+				req->data, twa_map_load_data_callback, req,
+				BUS_DMA_WAITOK);
 		} else {
 			/*
 			 * There's only one CAM I/O thread running at a time.
diff --git a/sys/dev/tws/tws.h b/sys/dev/tws/tws.h
index 5242d9d..e84047d 100644
--- a/sys/dev/tws/tws.h
+++ b/sys/dev/tws/tws.h
@@ -137,6 +137,7 @@ enum tws_req_flags {
     TWS_DIR_IN = 0x2,
     TWS_DIR_OUT = 0x4,
     TWS_DIR_NONE = 0x8,
+    TWS_DATA_CCB = 0x16,
 };
  
 enum tws_intrs {
diff --git a/sys/dev/tws/tws_cam.c b/sys/dev/tws/tws_cam.c
index 18ac2be..657777a 100644
--- a/sys/dev/tws/tws_cam.c
+++ b/sys/dev/tws/tws_cam.c
@@ -739,39 +739,8 @@ tws_execute_scsi(struct tws_softc *sc, union ccb *ccb)
     else
         bcopy(csio->cdb_io.cdb_bytes, cmd_pkt->cmd.pkt_a.cdb, csio->cdb_len);
 
-    if (!(ccb_h->flags & CAM_DATA_PHYS)) {
-         /* Virtual data addresses.  Need to convert them... */
-         if (!(ccb_h->flags & CAM_SCATTER_VALID)) {
-             if (csio->dxfer_len > TWS_MAX_IO_SIZE) {
-                 TWS_TRACE(sc, "I/O is big", csio->dxfer_len, 0);
-                 tws_release_request(req);
-                 ccb_h->status = CAM_REQ_TOO_BIG;
-                 xpt_done(ccb);
-                 return(0);
-             }
-
-             req->length = csio->dxfer_len;
-             if (req->length) {
-                 req->data = csio->data_ptr;
-                 /* there is 1 sgl_entrie */
-                 /* cmd_pkt->cmd.pkt_a.lun_h4__sgl_entries |= 1; */
-             }
-         } else {
-             TWS_TRACE_DEBUG(sc, "got sglist", ccb_h->target_id, ccb_h->target_lun);
-             tws_release_request(req);
-             ccb_h->status = CAM_REQ_INVALID;
-             xpt_done(ccb);
-             return(0);
-         }
-    } else {
-         /* Data addresses are physical. */
-         TWS_TRACE_DEBUG(sc, "Phy data addr", ccb_h->target_id, ccb_h->target_lun);
-         tws_release_request(req);
-         ccb_h->status = CAM_REQ_INVALID;
-         ccb_h->status &= ~CAM_SIM_QUEUED;
-         xpt_done(ccb);
-         return(0);
-    }
+    req->data = ccb;
+    req->flags |= TWS_DATA_CCB;
     /* save ccb ptr */
     req->ccb_ptr = ccb;
     /* 
@@ -961,10 +930,16 @@ tws_map_request(struct tws_softc *sc, struct tws_request *req)
          * Map the data buffer into bus space and build the SG list.
          */
         mtx_lock(&sc->io_lock);
-        error = bus_dmamap_load(sc->data_tag, req->dma_map,
-                                req->data, req->length,
-                                tws_dmamap_data_load_cbfn, req,
-                                my_flags);
+	if (req->flags & TWS_DATA_CCB)
+		error = bus_dmamap_load_ccb(sc->data_tag, req->dma_map,
+					    req->data,
+					    tws_dmamap_data_load_cbfn, req,
+					    my_flags);
+	else
+		error = bus_dmamap_load(sc->data_tag, req->dma_map,
+					req->data, req->length,
+					tws_dmamap_data_load_cbfn, req,
+					my_flags);
         mtx_unlock(&sc->io_lock);
 
         if (error == EINPROGRESS) {
diff --git a/sys/dev/virtio/scsi/virtio_scsi.c b/sys/dev/virtio/scsi/virtio_scsi.c
index 86684ba..7ebce09 100644
--- a/sys/dev/virtio/scsi/virtio_scsi.c
+++ b/sys/dev/virtio/scsi/virtio_scsi.c
@@ -961,28 +961,31 @@ vtscsi_sg_append_scsi_buf(struct vtscsi_softc *sc, struct sglist *sg,
 	ccbh = &csio->ccb_h;
 	error = 0;
 
-	if ((ccbh->flags & CAM_SCATTER_VALID) == 0) {
-
-		if ((ccbh->flags & CAM_DATA_PHYS) == 0)
+	switch ((ccbh->flags & CAM_DATA_MASK)) {
+	case CAM_DATA_VADDR:
+		error = sglist_append(sg, csio->data_ptr, csio->dxfer_len);
+		break;
+	case CAM_DATA_PADDR:
+		error = sglist_append_phys(sg,
+		    (vm_paddr_t)(vm_offset_t) csio->data_ptr, csio->dxfer_len);
+		break;
+	case CAM_DATA_SG:
+		for (i = 0; i < csio->sglist_cnt && error == 0; i++) {
+			dseg = &((struct bus_dma_segment *)csio->data_ptr)[i];
 			error = sglist_append(sg,
-			    csio->data_ptr, csio->dxfer_len);
-		else
-			error = sglist_append_phys(sg,
-			    (vm_paddr_t)(vm_offset_t) csio->data_ptr,
-			    csio->dxfer_len);
-	} else {
-
+			    (void *)(vm_offset_t) dseg->ds_addr, dseg->ds_len);
+		}
+		break;
+	case CAM_DATA_SG_PADDR:
 		for (i = 0; i < csio->sglist_cnt && error == 0; i++) {
 			dseg = &((struct bus_dma_segment *)csio->data_ptr)[i];
-
-			if ((ccbh->flags & CAM_SG_LIST_PHYS) == 0)
-				error = sglist_append(sg,
-				    (void *)(vm_offset_t) dseg->ds_addr,
-				    dseg->ds_len);
-			else
-				error = sglist_append_phys(sg,
-				    (vm_paddr_t) dseg->ds_addr, dseg->ds_len);
+			error = sglist_append_phys(sg,
+			    (vm_paddr_t) dseg->ds_addr, dseg->ds_len);
 		}
+		break;
+	default:
+		error = EINVAL;
+		break;
 	}
 
 	return (error);
diff --git a/sys/dev/wds/wd7000.c b/sys/dev/wds/wd7000.c
index 3dcd735..194d39e 100644
--- a/sys/dev/wds/wd7000.c
+++ b/sys/dev/wds/wd7000.c
@@ -1066,7 +1066,7 @@ wds_scsi_io(struct cam_sim * sim, struct ccb_scsiio * csio)
 		xpt_done((union ccb *) csio);
 		return;
 	}
-	if (ccb_h->flags & (CAM_CDB_PHYS | CAM_SCATTER_VALID | CAM_DATA_PHYS)) {
+	if ((ccb_h->flags & CAM_DATA_MASK) != CAM_DATA_VADDR) {
 		/* don't support these */
 		ccb_h->status = CAM_REQ_INVALID;
 		xpt_done((union ccb *) csio);