Merge branch 'pci/p2pdma'

  - Move P2PCMA PCI bus offset from generic dev_pagemap to
    pci_p2pdma_pagemap (Logan Gunthorpe)

  - Add provider's pci_dev to pci_p2pdma_pagemap (Logan Gunthorpe)

  - Apply host bridge whitelist for ACS (Logan Gunthorpe)

  - Whitelist some Intel host bridges for P2PDMA (Logan Gunthorpe)

  - Add attrs to pci_p2pdma_map_sg() to match dma_map_sg() (Logan
    Gunthorpe)

  - Add pci_p2pdma_unmap_sg() (Logan Gunthorpe)

  - Store P2PDMA mapping method in xarray (Logan Gunthorpe)

  - Map requests that traverse a host bridge (Logan Gunthorpe)

  - Allow IOMMU for host bridge whitelist (Logan Gunthorpe)

* pci/p2pdma:
  PCI/P2PDMA: Update pci_p2pdma_distance_many() documentation
  PCI/P2PDMA: Allow IOMMU for host bridge whitelist
  PCI/P2PDMA: dma_map() requests that traverse the host bridge
  PCI/P2PDMA: Store mapping method in an xarray
  PCI/P2PDMA: Factor out __pci_p2pdma_map_sg()
  PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg()
  PCI/P2PDMA: Add attrs argument to pci_p2pdma_map_sg()
  PCI/P2PDMA: Whitelist some Intel host bridges
  PCI/P2PDMA: Factor out host_bridge_whitelist()
  PCI/P2PDMA: Apply host bridge whitelist for ACS
  PCI/P2PDMA: Factor out __upstream_bridge_distance()
  PCI/P2PDMA: Add constants for map type results to upstream_bridge_distance()
  PCI/P2PDMA: Add provider's pci_dev to pci_p2pdma_pagemap struct
  PCI/P2PDMA: Introduce private pagemap structure

drivers/infiniband/core/rw.c

@@ -583,8 +583,10 @@ void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
 		break;
 	}
 
-	/* P2PDMA contexts do not need to be unmapped */
-	if (!is_pci_p2pdma_page(sg_page(sg)))
+	if (is_pci_p2pdma_page(sg_page(sg)))
+		pci_p2pdma_unmap_sg(qp->pd->device->dma_device, sg,
+				    sg_cnt, dir);
+	else
 		ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
 }
 EXPORT_SYMBOL(rdma_rw_ctx_destroy);

drivers/nvme/host/pci.c

@@ -547,8 +547,10 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
 
 	WARN_ON_ONCE(!iod->nents);
 
-	/* P2PDMA requests do not need to be unmapped */
-	if (!is_pci_p2pdma_page(sg_page(iod->sg)))
+	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));
 
 
@@ -832,8 +834,8 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
 		goto out;
 
 	if (is_pci_p2pdma_page(sg_page(iod->sg)))
-		nr_mapped = pci_p2pdma_map_sg(dev->dev, iod->sg, iod->nents,
-					      rq_dma_dir(req));
+		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);

include/linux/memremap.h

@@ -112,7 +112,6 @@ struct dev_pagemap {
 	struct device *dev;
 	enum memory_type type;
 	unsigned int flags;
-	u64 pci_p2pdma_bus_offset;
 	const struct dev_pagemap_ops *ops;
 };
 

include/linux/pci-p2pdma.h

@@ -30,8 +30,10 @@ struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
 					 unsigned int *nents, u32 length);
 void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
 void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
-int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-		      enum dma_data_direction dir);
+int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, unsigned long attrs);
+void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, unsigned long attrs);
 int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
 			    bool *use_p2pdma);
 ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
@@ -81,11 +83,17 @@ static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
 static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
 {
 }
-static inline int pci_p2pdma_map_sg(struct device *dev,
-		struct scatterlist *sg, int nents, enum dma_data_direction dir)
+static inline int pci_p2pdma_map_sg_attrs(struct device *dev,
+		struct scatterlist *sg, int nents, enum dma_data_direction dir,
+		unsigned long attrs)
 {
 	return 0;
 }
+static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev,
+		struct scatterlist *sg, int nents, enum dma_data_direction dir,
+		unsigned long attrs)
+{
+}
 static inline int pci_p2pdma_enable_store(const char *page,
 		struct pci_dev **p2p_dev, bool *use_p2pdma)
 {
@@ -111,4 +119,16 @@ static inline struct pci_dev *pci_p2pmem_find(struct device *client)
 	return pci_p2pmem_find_many(&client, 1);
 }
 
+static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg,
+				    int nents, enum dma_data_direction dir)
+{
+	return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0);
+}
+
+static inline void pci_p2pdma_unmap_sg(struct device *dev,
+		struct scatterlist *sg, int nents, enum dma_data_direction dir)
+{
+	pci_p2pdma_unmap_sg_attrs(dev, sg, nents, dir, 0);
+}
+
 #endif /* _LINUX_PCI_P2P_H */