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Subject[PATCH 04/16] PCI/P2PDMA: Refactor pci_p2pdma_map_type() to take pagmap and device
All callers of pci_p2pdma_map_type() have a struct dev_pgmap and a
struct device (of the client doing the DMA transfer). Thus move the
conversion to struct pci_devs for the provider and client into this
function.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/pci/p2pdma.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 2574a062a255..bcb1a6d6119d 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -822,14 +822,21 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool 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)
+static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap,
+ struct device *dev)
{
+ struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider;
enum pci_p2pdma_map_type ret;
+ struct pci_dev *client;

if (!provider->p2pdma)
return PCI_P2PDMA_MAP_NOT_SUPPORTED;

+ if (!dev_is_pci(dev))
+ return PCI_P2PDMA_MAP_NOT_SUPPORTED;
+
+ client = to_pci_dev(dev);
+
ret = xa_to_value(xa_load(&provider->p2pdma->map_types,
map_types_idx(client)));
if (ret != PCI_P2PDMA_MAP_UNKNOWN)
@@ -871,14 +878,8 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
{
struct pci_p2pdma_pagemap *p2p_pgmap =
to_p2p_pgmap(sg_page(sg)->pgmap);
- struct pci_dev *client;
-
- if (WARN_ON_ONCE(!dev_is_pci(dev)))
- return 0;

- client = to_pci_dev(dev);
-
- switch (pci_p2pdma_map_type(p2p_pgmap->provider, client)) {
+ switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev)) {
case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE:
return dma_map_sg_attrs(dev, sg, nents, dir, attrs);
case PCI_P2PDMA_MAP_BUS_ADDR:
@@ -901,17 +902,9 @@ EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs);
void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
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);
+ map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev);

if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE)
dma_unmap_sg_attrs(dev, sg, nents, dir, attrs);
--
2.20.1
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