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charset="utf-8" Extend the PCI endpoint core to support mapping subranges within a BAR. Introduce a new 'submap' field and a 'use_submap' flag in struct pci_epf_bar so an endpoint function driver can request inbound mappings that fully cover the BAR. The submap array describes the complete BAR layout (no overlaps and no gaps are allowed to avoid exposing untranslated address ranges). This provides the generic infrastructure needed to map multiple logical regions into a single BAR at different offsets, without assuming a controller-specific inbound address translation mechanism. Also, the array must be sorted in ascending order by offset. No controller-specific implementation is added in this commit. Signed-off-by: Koichiro Den --- include/linux/pci-epf.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 48f68c4dcfa5..91f2e3489cda 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -110,6 +110,28 @@ struct pci_epf_driver { =20 #define to_pci_epf_driver(drv) container_of_const((drv), struct pci_epf_dr= iver, driver) =20 +/** + * struct pci_epf_bar_submap - BAR subrange for inbound mapping + * @phys_addr: target physical/DMA address for this subrange + * @size: the size of the subrange to be mapped + * @offset: byte offset within the BAR base + * + * When pci_epf_bar.use_submap is set, pci_epf_bar.submap describes the + * complete BAR layout. This allows an EPC driver to program multiple + * inbound translation windows for a single BAR when supported by the + * controller. + * + * Note that the subranges: + * - must be non-overlapping + * - must exactly cover the BAR (i.e. no holes) + * - must be sorted (in ascending order by offset) + */ +struct pci_epf_bar_submap { + dma_addr_t phys_addr; + size_t size; + size_t offset; +}; + /** * struct pci_epf_bar - represents the BAR of EPF device * @phys_addr: physical address that should be mapped to the BAR @@ -119,6 +141,10 @@ struct pci_epf_driver { * requirement * @barno: BAR number * @flags: flags that are set for the BAR + * @use_submap: set true to request subrange mappings within this BAR + * @num_submap: number of entries in @submap + * @submap: array of subrange descriptors allocated by the caller. See + * struct pci_epf_bar_submap for the restrictions in detail. */ struct pci_epf_bar { dma_addr_t phys_addr; @@ -127,6 +153,11 @@ struct pci_epf_bar { size_t mem_size; enum pci_barno barno; int flags; + + /* Optional sub-range mapping */ + bool use_submap; + unsigned int num_submap; + struct pci_epf_bar_submap *submap; }; =20 /** --=20 2.51.0