PCI/P2PDMA: dma_map() requests that traverse the host bridge

Any requests that traverse the host bridge will need to be mapped into the
IOMMU, so call dma_map_sg() inside pci_p2pdma_map_sg() when appropriate.

Similarly, call dma_unmap_sg() inside pci_p2pdma_unmap_sg().

Link: https://lore.kernel.org/r/20190730163545.4915-13-logang@deltatee.com
Link: https://lore.kernel.org/r/20190812173048.9186-13-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Logan Gunthorpe 2019-08-12 11:30:46 -06:00 committed by Bjorn Helgaas
parent 110203bee0
commit 5d52e1abcd

View File

@ -807,6 +807,16 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
} }
EXPORT_SYMBOL_GPL(pci_p2pmem_publish); EXPORT_SYMBOL_GPL(pci_p2pmem_publish);
static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct pci_dev *provider,
struct pci_dev *client)
{
if (!provider->p2pdma)
return PCI_P2PDMA_MAP_NOT_SUPPORTED;
return xa_to_value(xa_load(&provider->p2pdma->map_types,
map_types_idx(client)));
}
static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap, static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap,
struct device *dev, struct scatterlist *sg, int nents) struct device *dev, struct scatterlist *sg, int nents)
{ {
@ -852,8 +862,22 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
{ {
struct pci_p2pdma_pagemap *p2p_pgmap = struct pci_p2pdma_pagemap *p2p_pgmap =
to_p2p_pgmap(sg_page(sg)->pgmap); to_p2p_pgmap(sg_page(sg)->pgmap);
struct pci_dev *client;
return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents); if (WARN_ON_ONCE(!dev_is_pci(dev)))
return 0;
client = to_pci_dev(dev);
switch (pci_p2pdma_map_type(p2p_pgmap->provider, client)) {
case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE:
return dma_map_sg_attrs(dev, sg, nents, dir, attrs);
case PCI_P2PDMA_MAP_BUS_ADDR:
return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents);
default:
WARN_ON_ONCE(1);
return 0;
}
} }
EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs); EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs);
@ -869,6 +893,20 @@ EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs);
void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs) int nents, enum dma_data_direction dir, unsigned long attrs)
{ {
struct pci_p2pdma_pagemap *p2p_pgmap =
to_p2p_pgmap(sg_page(sg)->pgmap);
enum pci_p2pdma_map_type map_type;
struct pci_dev *client;
if (WARN_ON_ONCE(!dev_is_pci(dev)))
return;
client = to_pci_dev(dev);
map_type = pci_p2pdma_map_type(p2p_pgmap->provider, client);
if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE)
dma_unmap_sg_attrs(dev, sg, nents, dir, attrs);
} }
EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs); EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs);