| Message ID | 20210311233142.7900-12-logang@deltatee.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Add support to dma_map_sg for P2PDMA | expand |
On Thu, Mar 11, 2021 at 04:31:41PM -0700, Logan Gunthorpe wrote: > Convert to using dma_[un]map_sg() for PCI p2pdma pages. > > This should be equivalent, though support will be somewhat less > (only dma-direct and dma-iommu are currently supported). > > Signed-off-by: Logan Gunthorpe <logang@deltatee.com> > drivers/nvme/host/pci.c | 27 +++++++-------------------- > 1 file changed, 7 insertions(+), 20 deletions(-) > > diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c > index 7d40c6a9e58e..89ca5acf7a62 100644 > +++ b/drivers/nvme/host/pci.c > @@ -577,17 +577,6 @@ static void nvme_free_sgls(struct nvme_dev *dev, struct request *req) > > } > > -static void nvme_unmap_sg(struct nvme_dev *dev, struct request *req) > -{ > - struct nvme_iod *iod = blk_mq_rq_to_pdu(req); > - > - if (is_pci_p2pdma_page(sg_page(iod->sg))) > - pci_p2pdma_unmap_sg(dev->dev, iod->sg, iod->nents, > - rq_dma_dir(req)); > - else > - dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); > -} Can the two other places with this code pattern be changed too? Jason
On 2021-03-11 4:59 p.m., Jason Gunthorpe wrote: > On Thu, Mar 11, 2021 at 04:31:41PM -0700, Logan Gunthorpe wrote: >> Convert to using dma_[un]map_sg() for PCI p2pdma pages. >> >> This should be equivalent, though support will be somewhat less >> (only dma-direct and dma-iommu are currently supported). >> >> Signed-off-by: Logan Gunthorpe <logang@deltatee.com> >> drivers/nvme/host/pci.c | 27 +++++++-------------------- >> 1 file changed, 7 insertions(+), 20 deletions(-) >> >> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c >> index 7d40c6a9e58e..89ca5acf7a62 100644 >> +++ b/drivers/nvme/host/pci.c >> @@ -577,17 +577,6 @@ static void nvme_free_sgls(struct nvme_dev *dev, struct request *req) >> >> } >> >> -static void nvme_unmap_sg(struct nvme_dev *dev, struct request *req) >> -{ >> - struct nvme_iod *iod = blk_mq_rq_to_pdu(req); >> - >> - if (is_pci_p2pdma_page(sg_page(iod->sg))) >> - pci_p2pdma_unmap_sg(dev->dev, iod->sg, iod->nents, >> - rq_dma_dir(req)); >> - else >> - dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); >> -} > > Can the two other places with this code pattern be changed too? Yes, if this goes forward, I imagine completely dropping pci_p2pdma_unmap_sg(). Logan
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 7d40c6a9e58e..89ca5acf7a62 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -577,17 +577,6 @@ static void nvme_free_sgls(struct nvme_dev *dev, struct request *req) } -static void nvme_unmap_sg(struct nvme_dev *dev, struct request *req) -{ - struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - - if (is_pci_p2pdma_page(sg_page(iod->sg))) - pci_p2pdma_unmap_sg(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req)); - else - dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); -} - static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); @@ -600,7 +589,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) WARN_ON_ONCE(!iod->nents); - nvme_unmap_sg(dev, req); + dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); if (iod->npages == 0) dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], iod->first_dma); @@ -868,13 +857,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, if (!iod->nents) goto out_free_sg; - if (is_pci_p2pdma_page(sg_page(iod->sg))) - nr_mapped = pci_p2pdma_map_sg_attrs(dev->dev, iod->sg, - iod->nents, rq_dma_dir(req), DMA_ATTR_NO_WARN); - else - nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req), DMA_ATTR_NO_WARN); - if (!nr_mapped) + nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, + rq_dma_dir(req), DMA_ATTR_NO_WARN); + if (nr_mapped < 0) + ret = BLK_STS_P2PDMA; + if (nr_mapped <= 0) goto out_free_sg; iod->use_sgl = nvme_pci_use_sgls(dev, req); @@ -887,7 +874,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, return BLK_STS_OK; out_unmap_sg: - nvme_unmap_sg(dev, req); + dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); out_free_sg: mempool_free(iod->sg, dev->iod_mempool); return ret;
Convert to using dma_[un]map_sg() for PCI p2pdma pages. This should be equivalent, though support will be somewhat less (only dma-direct and dma-iommu are currently supported). Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/nvme/host/pci.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-)