[PATCH 16/16] PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg()

Logan Gunthorpe
2021-04-08T17:02:00Z

This interface is superseded by the new dma_map_sg_p2pdma() interface
which supports heterogeneous scatterlists. There are no longer
any users, so remove it.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/pci/p2pdma.c | 67 --------------------------------------
include/linux/pci-p2pdma.h | 27 ---------------
2 files changed, 94 deletions(-)

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 44ad7664e875..2f2adcccfa11 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -856,73 +856,6 @@ enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap,
GFP_ATOMIC);
}

-static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap,
- struct device *dev, struct scatterlist *sg, int nents)
-{
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i) {
- s->dma_address = sg_phys(s) - p2p_pgmap->bus_offset;
- sg_dma_len(s) = s->length;
- }
-
- return nents;
-}
-
-/**
- * pci_p2pdma_map_sg_attrs - map a PCI peer-to-peer scatterlist for DMA
- * @dev: device doing the DMA request
- * @sg: scatter list to map
- * @nents: elements in the scatterlist
- * @dir: DMA direction
- * @attrs: DMA attributes passed to dma_map_sg() (if called)
- *
- * Scatterlists mapped with this function should be unmapped using
- * pci_p2pdma_unmap_sg_attrs().
- *
- * Returns the number of SG entries mapped or 0 on error.
- */
-int pci_p2pdma_map_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);
-
- switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev,
- __DMA_ATTR_PCI_P2PDMA)) {
- 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:
- return 0;
- }
-}
-EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs);
-
-/**
- * pci_p2pdma_unmap_sg_attrs - unmap a PCI peer-to-peer scatterlist that was
- * mapped with pci_p2pdma_map_sg()
- * @dev: device doing the DMA request
- * @sg: scatter list to map
- * @nents: number of elements returned by pci_p2pdma_map_sg()
- * @dir: DMA direction
- * @attrs: DMA attributes passed to dma_unmap_sg() (if called)
- */
-void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- enum pci_p2pdma_map_type map_type;
-
- map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev,
- __DMA_ATTR_PCI_P2PDMA);
-
- 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);
-
/**
* pci_p2pdma_map_segment - map an sg segment determining the mapping type
* @state: State structure that should be declared on the stack outside of
diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h
index 49e7679403cf..2ec9c75fa097 100644
--- a/include/linux/pci-p2pdma.h
+++ b/include/linux/pci-p2pdma.h
@@ -45,10 +45,6 @@ void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap,
struct device *dev, unsigned long dma_attrs);
-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_map_segment(struct pci_p2pdma_map_state *state,
struct device *dev, struct scatterlist *sg,
unsigned long dma_attrs);
@@ -109,17 +105,6 @@ static inline enum pci_p2pdma_map_type pci_p2pdma_map_type(
{
return PCI_P2PDMA_MAP_NOT_SUPPORTED;
}
-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_map_segment(struct pci_p2pdma_map_state *state,
struct device *dev, struct scatterlist *sg,
unsigned long dma_attrs)
@@ -155,16 +140,4 @@ 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 */
--
2.20.1