| Message ID | 27698e7cc55f6ca5371c3d86c50fd3afce9afddd.1730037276.git.leon@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Provide a new two step DMA mapping API | expand |
On 2024-10-27 08:21, Leon Romanovsky wrote: > From: Christoph Hellwig <hch@lst.de> > > To support the upcoming non-scatterlist mapping helpers, we need to go > back to have them called outside of the DMA API. Thus move them out of > dma-map-ops.h, which is only for DMA API implementations to pci-p2pdma.h, > which is for driver use. > > Note that the core helper is still not exported as the mapping is > expected to be done only by very highlevel subsystem code at least for > now. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Also looks good. Thanks! Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
On Sun, Oct 27, 2024 at 04:21:02PM +0200, Leon Romanovsky wrote: > From: Christoph Hellwig <hch@lst.de> > > To support the upcoming non-scatterlist mapping helpers, we need to go > back to have them called outside of the DMA API. Thus move them out of > dma-map-ops.h, which is only for DMA API implementations to pci-p2pdma.h, > which is for driver use. > > Note that the core helper is still not exported as the mapping is > expected to be done only by very highlevel subsystem code at least for > now. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/iommu/dma-iommu.c | 1 + > include/linux/dma-map-ops.h | 84 ------------------------------------- > include/linux/pci-p2pdma.h | 84 +++++++++++++++++++++++++++++++++++++ > kernel/dma/direct.c | 1 + > 4 files changed, 86 insertions(+), 84 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 6e50023c8112..c422e36c0d66 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -26,6 +26,7 @@ > #include <linux/mutex.h> > #include <linux/of_iommu.h> > #include <linux/pci.h> > +#include <linux/pci-p2pdma.h> > #include <linux/scatterlist.h> > #include <linux/spinlock.h> > #include <linux/swiotlb.h> > diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h > index 49edcbda19d1..6ee626e50708 100644 > --- a/include/linux/dma-map-ops.h > +++ b/include/linux/dma-map-ops.h > @@ -435,88 +435,4 @@ static inline void debug_dma_dump_mappings(struct device *dev) > > extern const struct dma_map_ops dma_dummy_ops; > > -enum pci_p2pdma_map_type { > - /* > - * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping > - * type hasn't been calculated yet. Functions that return this enum > - * never return this value. > - */ > - PCI_P2PDMA_MAP_UNKNOWN = 0, > - > - /* > - * Not a PCI P2PDMA transfer. > - */ > - PCI_P2PDMA_MAP_NONE, > - > - /* > - * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will > - * traverse the host bridge and the host bridge is not in the > - * allowlist. DMA Mapping routines should return an error when > - * this is returned. > - */ > - PCI_P2PDMA_MAP_NOT_SUPPORTED, > - > - /* > - * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to > - * each other directly through a PCI switch and the transaction will > - * not traverse the host bridge. Such a mapping should program > - * the DMA engine with PCI bus addresses. > - */ > - PCI_P2PDMA_MAP_BUS_ADDR, > - > - /* > - * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk > - * to each other, but the transaction traverses a host bridge on the > - * allowlist. In this case, a normal mapping either with CPU physical > - * addresses (in the case of dma-direct) or IOVA addresses (in the > - * case of IOMMUs) should be used to program the DMA engine. > - */ > - PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, > -}; > - > -struct pci_p2pdma_map_state { > - struct dev_pagemap *pgmap; > - enum pci_p2pdma_map_type map; > - u64 bus_off; > -}; > - > -/* helper for pci_p2pdma_state(), do not use directly */ > -void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, > - struct device *dev, struct page *page); > - > -/** > - * pci_p2pdma_state - check the P2P transfer state of a page > - * @state: P2P state structure > - * @dev: device to transfer to/from > - * @page: page to map > - * > - * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the > - * map type, and updates @state with all information needed for a P2P transfer. > - */ > -static inline enum pci_p2pdma_map_type > -pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, > - struct page *page) > -{ > - if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { > - if (state->pgmap != page->pgmap) > - __pci_p2pdma_update_state(state, dev, page); > - return state->map; > - } > - return PCI_P2PDMA_MAP_NONE; > -} > - > -/** > - * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer > - * @state: P2P state structure > - * @paddr: physical address to map > - * > - * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. > - */ > -static inline dma_addr_t > -pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) > -{ > - WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); > - return paddr + state->bus_off; > -} > - > #endif /* _LINUX_DMA_MAP_OPS_H */ > diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h > index 2c07aa6b7665..66b71f60a811 100644 > --- a/include/linux/pci-p2pdma.h > +++ b/include/linux/pci-p2pdma.h > @@ -104,4 +104,88 @@ static inline struct pci_dev *pci_p2pmem_find(struct device *client) > return pci_p2pmem_find_many(&client, 1); > } > > +enum pci_p2pdma_map_type { > + /* > + * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping > + * type hasn't been calculated yet. Functions that return this enum > + * never return this value. > + */ > + PCI_P2PDMA_MAP_UNKNOWN = 0, > + > + /* > + * Not a PCI P2PDMA transfer. > + */ > + PCI_P2PDMA_MAP_NONE, > + > + /* > + * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will > + * traverse the host bridge and the host bridge is not in the > + * allowlist. DMA Mapping routines should return an error when > + * this is returned. > + */ > + PCI_P2PDMA_MAP_NOT_SUPPORTED, > + > + /* > + * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to > + * each other directly through a PCI switch and the transaction will > + * not traverse the host bridge. Such a mapping should program > + * the DMA engine with PCI bus addresses. > + */ > + PCI_P2PDMA_MAP_BUS_ADDR, > + > + /* > + * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk > + * to each other, but the transaction traverses a host bridge on the > + * allowlist. In this case, a normal mapping either with CPU physical > + * addresses (in the case of dma-direct) or IOVA addresses (in the > + * case of IOMMUs) should be used to program the DMA engine. > + */ > + PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, > +}; > + > +struct pci_p2pdma_map_state { > + struct dev_pagemap *pgmap; > + enum pci_p2pdma_map_type map; > + u64 bus_off; > +}; > + > +/* helper for pci_p2pdma_state(), do not use directly */ > +void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, > + struct device *dev, struct page *page); > + > +/** > + * pci_p2pdma_state - check the P2P transfer state of a page > + * @state: P2P state structure > + * @dev: device to transfer to/from > + * @page: page to map > + * > + * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the > + * map type, and updates @state with all information needed for a P2P transfer. > + */ > +static inline enum pci_p2pdma_map_type > +pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, > + struct page *page) > +{ > + if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { > + if (state->pgmap != page->pgmap) > + __pci_p2pdma_update_state(state, dev, page); > + return state->map; > + } > + return PCI_P2PDMA_MAP_NONE; > +} > + > +/** > + * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer > + * @state: P2P state structure > + * @paddr: physical address to map > + * > + * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. > + */ > +static inline dma_addr_t > +pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) > +{ > + WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); > + return paddr + state->bus_off; > +} > + > #endif /* _LINUX_PCI_P2P_H */ > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index a793400161c2..47e124561fff 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -13,6 +13,7 @@ > #include <linux/vmalloc.h> > #include <linux/set_memory.h> > #include <linux/slab.h> > +#include <linux/pci-p2pdma.h> > #include "direct.h" > > /* > -- > 2.46.2 >
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 6e50023c8112..c422e36c0d66 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -26,6 +26,7 @@ #include <linux/mutex.h> #include <linux/of_iommu.h> #include <linux/pci.h> +#include <linux/pci-p2pdma.h> #include <linux/scatterlist.h> #include <linux/spinlock.h> #include <linux/swiotlb.h> diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 49edcbda19d1..6ee626e50708 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -435,88 +435,4 @@ static inline void debug_dma_dump_mappings(struct device *dev) extern const struct dma_map_ops dma_dummy_ops; -enum pci_p2pdma_map_type { - /* - * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping - * type hasn't been calculated yet. Functions that return this enum - * never return this value. - */ - PCI_P2PDMA_MAP_UNKNOWN = 0, - - /* - * Not a PCI P2PDMA transfer. - */ - PCI_P2PDMA_MAP_NONE, - - /* - * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will - * traverse the host bridge and the host bridge is not in the - * allowlist. DMA Mapping routines should return an error when - * this is returned. - */ - PCI_P2PDMA_MAP_NOT_SUPPORTED, - - /* - * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to - * each other directly through a PCI switch and the transaction will - * not traverse the host bridge. Such a mapping should program - * the DMA engine with PCI bus addresses. - */ - PCI_P2PDMA_MAP_BUS_ADDR, - - /* - * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk - * to each other, but the transaction traverses a host bridge on the - * allowlist. In this case, a normal mapping either with CPU physical - * addresses (in the case of dma-direct) or IOVA addresses (in the - * case of IOMMUs) should be used to program the DMA engine. - */ - PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, -}; - -struct pci_p2pdma_map_state { - struct dev_pagemap *pgmap; - enum pci_p2pdma_map_type map; - u64 bus_off; -}; - -/* helper for pci_p2pdma_state(), do not use directly */ -void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, - struct device *dev, struct page *page); - -/** - * pci_p2pdma_state - check the P2P transfer state of a page - * @state: P2P state structure - * @dev: device to transfer to/from - * @page: page to map - * - * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the - * map type, and updates @state with all information needed for a P2P transfer. - */ -static inline enum pci_p2pdma_map_type -pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, - struct page *page) -{ - if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { - if (state->pgmap != page->pgmap) - __pci_p2pdma_update_state(state, dev, page); - return state->map; - } - return PCI_P2PDMA_MAP_NONE; -} - -/** - * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer - * @state: P2P state structure - * @paddr: physical address to map - * - * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. - */ -static inline dma_addr_t -pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) -{ - WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); - return paddr + state->bus_off; -} - #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 2c07aa6b7665..66b71f60a811 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -104,4 +104,88 @@ static inline struct pci_dev *pci_p2pmem_find(struct device *client) return pci_p2pmem_find_many(&client, 1); } +enum pci_p2pdma_map_type { + /* + * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping + * type hasn't been calculated yet. Functions that return this enum + * never return this value. + */ + PCI_P2PDMA_MAP_UNKNOWN = 0, + + /* + * Not a PCI P2PDMA transfer. + */ + PCI_P2PDMA_MAP_NONE, + + /* + * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will + * traverse the host bridge and the host bridge is not in the + * allowlist. DMA Mapping routines should return an error when + * this is returned. + */ + PCI_P2PDMA_MAP_NOT_SUPPORTED, + + /* + * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to + * each other directly through a PCI switch and the transaction will + * not traverse the host bridge. Such a mapping should program + * the DMA engine with PCI bus addresses. + */ + PCI_P2PDMA_MAP_BUS_ADDR, + + /* + * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk + * to each other, but the transaction traverses a host bridge on the + * allowlist. In this case, a normal mapping either with CPU physical + * addresses (in the case of dma-direct) or IOVA addresses (in the + * case of IOMMUs) should be used to program the DMA engine. + */ + PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, +}; + +struct pci_p2pdma_map_state { + struct dev_pagemap *pgmap; + enum pci_p2pdma_map_type map; + u64 bus_off; +}; + +/* helper for pci_p2pdma_state(), do not use directly */ +void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, + struct device *dev, struct page *page); + +/** + * pci_p2pdma_state - check the P2P transfer state of a page + * @state: P2P state structure + * @dev: device to transfer to/from + * @page: page to map + * + * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the + * map type, and updates @state with all information needed for a P2P transfer. + */ +static inline enum pci_p2pdma_map_type +pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, + struct page *page) +{ + if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { + if (state->pgmap != page->pgmap) + __pci_p2pdma_update_state(state, dev, page); + return state->map; + } + return PCI_P2PDMA_MAP_NONE; +} + +/** + * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer + * @state: P2P state structure + * @paddr: physical address to map + * + * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. + */ +static inline dma_addr_t +pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) +{ + WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); + return paddr + state->bus_off; +} + #endif /* _LINUX_PCI_P2P_H */ diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index a793400161c2..47e124561fff 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -13,6 +13,7 @@ #include <linux/vmalloc.h> #include <linux/set_memory.h> #include <linux/slab.h> +#include <linux/pci-p2pdma.h> #include "direct.h" /*