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 Zhe/CfHv 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 02, 2025 at 03:59:37PM -0600, Keith Busch wrote: > On Tue, Sep 02, 2025 at 10:49:48PM +0200, Marek Szyprowski wrote: > > On 19.08.2025 19:36, Leon Romanovsky wrote: > > > @@ -87,8 +87,8 @@ static bool blk_dma_map_bus(struct blk_dma_iter *iter, struct phys_vec *vec) > > > static bool blk_dma_map_direct(struct request *req, struct device *dma_dev, > > > struct blk_dma_iter *iter, struct phys_vec *vec) > > > { > > > - iter->addr = dma_map_page(dma_dev, phys_to_page(vec->paddr), > > > - offset_in_page(vec->paddr), vec->len, rq_dma_dir(req)); > > > + iter->addr = dma_map_phys(dma_dev, vec->paddr, vec->len, > > > + rq_dma_dir(req), 0); > > > if (dma_mapping_error(dma_dev, iter->addr)) { > > > iter->status = BLK_STS_RESOURCE; > > > return false; > > > > I wonder where is the corresponding dma_unmap_page() call and its change > > to dma_unmap_phys()... > > You can't do that in the generic layer, so it's up to the caller. The > dma addrs that blk_dma_iter yield are used in a caller specific > structure. For example, for NVMe, it goes into an NVMe PRP. The generic > layer doesn't know what that is, so the driver has to provide the > unmapping. To be specific I think it is this hunk in another patch that matches the above: @@ -682,11 +682,15 @@ static void nvme_free_prps(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct nvme_queue *nvmeq = req->mq_hctx->driver_data; + unsigned int attrs = 0; unsigned int i; + if (req->cmd_flags & REQ_MMIO) + attrs = DMA_ATTR_MMIO; + for (i = 0; i < iod->nr_dma_vecs; i++) - dma_unmap_page(nvmeq->dev->dev, iod->dma_vecs[i].addr, - iod->dma_vecs[i].len, rq_dma_dir(req)); + dma_unmap_phys(nvmeq->dev->dev, iod->dma_vecs[i].addr, + iod->dma_vecs[i].len, rq_dma_dir(req), attrs); And it is functionally fine to split the series like this because unmap_page is a nop around unmap_phys: void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { if (unlikely(attrs & DMA_ATTR_MMIO)) return; dma_unmap_phys(dev, addr, size, dir, attrs); } EXPORT_SYMBOL(dma_unmap_page_attrs); Jason