diff options
Diffstat (limited to 'sys/kern/subr_bus_dma.c')
| -rw-r--r-- | sys/kern/subr_bus_dma.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sys/kern/subr_bus_dma.c b/sys/kern/subr_bus_dma.c index 38d192e..0c4be9b 100644 --- a/sys/kern/subr_bus_dma.c +++ b/sys/kern/subr_bus_dma.c @@ -409,6 +409,45 @@ bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, } int +bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, + bus_dmamap_callback_t *callback, void *callback_arg, + int flags) +{ + bus_dma_segment_t *segs; + struct memdesc mem; + int error; + int nsegs; + + if ((flags & BUS_DMA_NOWAIT) == 0) { + mem = memdesc_bio(bio); + _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); + } + nsegs = -1; + error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags); + nsegs++; + + CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", + __func__, dmat, flags, error, nsegs); + + if (error == EINPROGRESS) + return (error); + + segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); + if (error) + (*callback)(callback_arg, segs, 0, error); + else + (*callback)(callback_arg, segs, nsegs, error); + /* + * Return ENOMEM to the caller so that it can pass it up the stack. + * This error only happens when NOWAIT is set, so deferral is disabled. + */ + if (error == ENOMEM) + return (error); + + return (0); +} + +int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map, struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg, int flags) |
