diff options
Diffstat (limited to 'lib/dma.h')
-rw-r--r-- | lib/dma.h | 48 |
1 files changed, 28 insertions, 20 deletions
@@ -229,35 +229,38 @@ dma_map_sg(dma_controller_t *dma, dma_sg_t *sg, struct iovec *iov, int cnt) { dma_memory_region_t *region; - int i; assert(dma != NULL); assert(sg != NULL); assert(iov != NULL); + assert(cnt > 0); - for (i = 0; i < cnt; i++) { - if (sg[i].region >= dma->nregions) { + do { + if (sg->region >= dma->nregions) { return ERROR_INT(EINVAL); } - region = &dma->regions[sg[i].region]; + region = &dma->regions[sg->region]; if (region->info.vaddr == NULL) { return ERROR_INT(EFAULT); } - if (sg[i].writeable) { + if (sg->writeable) { if (dma->dirty_pgsize > 0) { - _dma_mark_dirty(dma, region, &sg[i]); + _dma_mark_dirty(dma, region, sg); } - LIST_INSERT_HEAD(&dma->maps, &sg[i], entry); + LIST_INSERT_HEAD(&dma->maps, sg, entry); } vfu_log(dma->vfu_ctx, LOG_DEBUG, "map %p-%p", - sg[i].dma_addr + sg[i].offset, - sg[i].dma_addr + sg[i].offset + sg[i].length); - iov[i].iov_base = region->info.vaddr + sg[i].offset; - iov[i].iov_len = sg[i].length; + sg->dma_addr + sg->offset, + sg->dma_addr + sg->offset + sg->length); + iov->iov_base = region->info.vaddr + sg->offset; + iov->iov_len = sg->length; region->refcnt++; - } + + sg++; + iov++; + } while (--cnt > 0); return 0; } @@ -266,9 +269,13 @@ static inline void dma_unmap_sg(dma_controller_t *dma, const dma_sg_t *sg, UNUSED struct iovec *iov, int cnt) { - int i; - for (i = 0; i < cnt; i++) { + assert(dma != NULL); + assert(sg != NULL); + assert(iov != NULL); + assert(cnt > 0); + + do { dma_memory_region_t *r; /* * FIXME this double loop will be removed if we replace the array with @@ -276,20 +283,21 @@ dma_unmap_sg(dma_controller_t *dma, const dma_sg_t *sg, */ for (r = dma->regions; r < dma->regions + dma->nregions && - r->info.iova.iov_base != sg[i].dma_addr; + r->info.iova.iov_base != sg->dma_addr; r++); if (r > dma->regions + dma->nregions) { /* bad region */ continue; } - if (sg[i].writeable) { - LIST_REMOVE(&sg[i], entry); + if (sg->writeable) { + LIST_REMOVE(sg, entry); } vfu_log(dma->vfu_ctx, LOG_DEBUG, "unmap %p-%p", - sg[i].dma_addr + sg[i].offset, - sg[i].dma_addr + sg[i].offset + sg[i].length); + sg->dma_addr + sg->offset, + sg->dma_addr + sg->offset + sg->length); r->refcnt--; - } + sg++; + } while (--cnt > 0); } int |