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Merge branch 'pci/peer-to-peer'

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- Add PCI support for peer-to-peer DMA (Logan Gunthorpe)

  - Add sysfs group for PCI peer-to-peer memory statistics (Logan
    Gunthorpe)

  - Add PCI peer-to-peer DMA scatterlist mapping interface (Logan
    Gunthorpe)

  - Add PCI configfs/sysfs helpers for use by peer-to-peer users (Logan
    Gunthorpe)

  - Add PCI peer-to-peer DMA driver writer's documentation (Logan
    Gunthorpe)

  - Add block layer flag to indicate driver support for PCI peer-to-peer
    DMA (Logan Gunthorpe)

  - Map Infiniband scatterlists for peer-to-peer DMA if they contain P2P
    memory (Logan Gunthorpe)

  - Register nvme-pci CMB buffer as PCI peer-to-peer memory (Logan
    Gunthorpe)

  - Add nvme-pci support for PCI peer-to-peer memory in requests (Logan
    Gunthorpe)

  - Use PCI peer-to-peer memory in nvme (Stephen Bates, Steve Wise,
    Christoph Hellwig, Logan Gunthorpe)

* pci/peer-to-peer:
  nvmet: Optionally use PCI P2P memory
  nvmet: Introduce helper functions to allocate and free request SGLs
  nvme-pci: Add support for P2P memory in requests
  nvme-pci: Use PCI p2pmem subsystem to manage the CMB
  IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]()
  block: Add PCI P2P flag for request queue
  PCI/P2PDMA: Add P2P DMA driver writer's documentation
  docs-rst: Add a new directory for PCI documentation
  PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers
  PCI/P2PDMA: Add PCI p2pmem DMA mappings to adjust the bus offset
  PCI/P2PDMA: Add sysfs group to display p2pmem stats
  PCI/P2PDMA: Support peer-to-peer memory
This commit is contained in:
Bjorn Helgaas
2018-10-20 11:45:33 -05:00
parent 0af6166395 c6925093d0
commit 1734715493
22 changed files with 1493 additions and 50 deletions
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11
drivers/infiniband/core/rw.c
View File

@@ -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);