1033         struct buf *bp;
1034         struct tgdk_iob *iobp;
1035         size_t rlen;
1036 
1037         iobp = kmem_zalloc(sizeof (*iobp), kmsflg);
1038         if (iobp == NULL)
1039                 return (NULL);
1040         if ((bp = getrbuf(kmsflg)) == NULL) {
1041                 kmem_free(iobp, sizeof (*iobp));
1042                 return (NULL);
1043         }
1044 
1045         iobp->b_psec  = LBLK2SEC(blkno, dadkp->dad_blkshf);
1046         iobp->b_pbyteoff = (blkno & ((1<<dadkp->dad_blkshf) - 1)) << SCTRSHFT;
1047         iobp->b_pbytecnt = ((iobp->b_pbyteoff + xfer + dadkp->DAD_SECSIZ - 1)
1048             >> dadkp->dad_secshf) << dadkp->dad_secshf;
1049 
1050         bp->b_un.b_addr = 0;
1051         /*
1052          * use i_ddi_mem_alloc() for now until we have an interface to allocate
1053          * memory for DMA which doesn't require a DMA handle. ddi_iopb_alloc()
1054          * is obsolete and we want more flexibility in controlling the DMA
1055          * address constraints..
1056          */
1057         if (i_ddi_mem_alloc((dadkp->dad_sd)->sd_dev, &dadk_alloc_attr,
1058             (size_t)iobp->b_pbytecnt, ((kmsflg == KM_SLEEP) ? 1 : 0), 0, NULL,
1059             &bp->b_un.b_addr, &rlen, NULL) != DDI_SUCCESS) {
1060                 freerbuf(bp);
1061                 kmem_free(iobp, sizeof (*iobp));
1062                 return (NULL);
1063         }
1064         iobp->b_flag |= IOB_BPALLOC | IOB_BPBUFALLOC;
1065         iobp->b_bp = bp;
1066         iobp->b_lblk = blkno;
1067         iobp->b_xfer = xfer;
1068         iobp->b_lblk = blkno;
1069         iobp->b_xfer = xfer;
1070         return (iobp);
1071 }
1072 
1073 /* ARGSUSED */
1074 int
1075 dadk_iob_free(opaque_t objp, struct tgdk_iob *iobp)

1033         struct buf *bp;
1034         struct tgdk_iob *iobp;
1035         size_t rlen;
1036 
1037         iobp = kmem_zalloc(sizeof (*iobp), kmsflg);
1038         if (iobp == NULL)
1039                 return (NULL);
1040         if ((bp = getrbuf(kmsflg)) == NULL) {
1041                 kmem_free(iobp, sizeof (*iobp));
1042                 return (NULL);
1043         }
1044 
1045         iobp->b_psec  = LBLK2SEC(blkno, dadkp->dad_blkshf);
1046         iobp->b_pbyteoff = (blkno & ((1<<dadkp->dad_blkshf) - 1)) << SCTRSHFT;
1047         iobp->b_pbytecnt = ((iobp->b_pbyteoff + xfer + dadkp->DAD_SECSIZ - 1)
1048             >> dadkp->dad_secshf) << dadkp->dad_secshf;
1049 
1050         bp->b_un.b_addr = 0;
1051         /*
1052          * use i_ddi_mem_alloc() for now until we have an interface to allocate
1053          * memory for DMA which doesn't require a DMA handle.


1054          */
1055         if (i_ddi_mem_alloc((dadkp->dad_sd)->sd_dev, &dadk_alloc_attr,
1056             (size_t)iobp->b_pbytecnt, ((kmsflg == KM_SLEEP) ? 1 : 0), 0, NULL,
1057             &bp->b_un.b_addr, &rlen, NULL) != DDI_SUCCESS) {
1058                 freerbuf(bp);
1059                 kmem_free(iobp, sizeof (*iobp));
1060                 return (NULL);
1061         }
1062         iobp->b_flag |= IOB_BPALLOC | IOB_BPBUFALLOC;
1063         iobp->b_bp = bp;
1064         iobp->b_lblk = blkno;
1065         iobp->b_xfer = xfer;
1066         iobp->b_lblk = blkno;
1067         iobp->b_xfer = xfer;
1068         return (iobp);
1069 }
1070 
1071 /* ARGSUSED */
1072 int
1073 dadk_iob_free(opaque_t objp, struct tgdk_iob *iobp)