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authorLogan Gunthorpe <logang@deltatee.com>2018-10-04 15:27:42 -0600
committerBjorn Helgaas <bhelgaas@google.com>2018-10-17 12:18:20 -0500
commit50b7d22079f74571a0fa73420586a7ad1ffebe2f (patch)
treeb803fb76711af7c26ec22bde8f9cea71f1f22fa9 /drivers/infiniband/core
parent49d92c0dd64ae769c2d67fe27ac260ae31259ba6 (diff)
IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]()
In order to use PCI P2P memory the pci_p2pmem_map_sg() function must be called to map the correct PCI bus address. To do this, check the first page in the scatter list to see if it is P2P memory or not. At the moment, scatter lists that contain P2P memory must be homogeneous so if the first page is P2P the entire SGL should be P2P. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/rw.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c
index 683e6d11a564..d22c4a2ebac6 100644
--- a/drivers/infiniband/core/rw.c
+++ b/drivers/infiniband/core/rw.c
@@ -12,6 +12,7 @@
*/
#include <linux/moduleparam.h>
#include <linux/slab.h>
+#include <linux/pci-p2pdma.h>
#include <rdma/mr_pool.h>
#include <rdma/rw.h>
@@ -280,7 +281,11 @@ int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
struct ib_device *dev = qp->pd->device;
int ret;
- ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
+ if (is_pci_p2pdma_page(sg_page(sg)))
+ ret = pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir);
+ else
+ ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
+
if (!ret)
return -ENOMEM;
sg_cnt = ret;
@@ -602,7 +607,9 @@ void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
break;
}
- ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
+ /* P2PDMA contexts do not need to be unmapped */
+ if (!is_pci_p2pdma_page(sg_page(sg)))
+ ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
}
EXPORT_SYMBOL(rdma_rw_ctx_destroy);