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Even in that case, EPF drivers may need to reference a > well-defined subset of that BAR, e.g. to reuse an integrated DMA > controller MMIO window as a doorbell target. > > Introduce struct pci_epc_bar_rsvd_region and extend struct > pci_epc_bar_desc so EPC drivers can advertise such fixed subregions in a > controller-agnostic way. > > No functional change for existing users. > > Signed-off-by: Koichiro Den > Signed-off-by: Niklas Cassel Tested by: Manikanta Maddireddy > --- > include/linux/pci-epc.h | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h > index c22f8a6cf9a3..f7f48f43d370 100644 > --- a/include/linux/pci-epc.h > +++ b/include/linux/pci-epc.h > @@ -203,6 +203,30 @@ enum pci_epc_bar_type { > BAR_64BIT_UPPER, > }; > > +/** > + * enum pci_epc_bar_rsvd_region_type - type of a fixed subregion behind a BAR > + * @PCI_EPC_BAR_RSVD_DMA_CTRL_MMIO: Integrated DMA controller MMIO window > + * > + * BARs marked BAR_RESERVED are owned by the SoC/EPC hardware and must not be > + * reprogrammed by EPF drivers. Some of them still expose fixed subregions that > + * EPFs may want to reference (e.g. embedded doorbell fallback). > + */ > +enum pci_epc_bar_rsvd_region_type { > + PCI_EPC_BAR_RSVD_DMA_CTRL_MMIO = 0, > +}; > + > +/** > + * struct pci_epc_bar_rsvd_region - fixed subregion behind a BAR > + * @type: reserved region type > + * @offset: offset within the BAR aperture > + * @size: size of the reserved region > + */ > +struct pci_epc_bar_rsvd_region { > + enum pci_epc_bar_rsvd_region_type type; > + resource_size_t offset; > + resource_size_t size; > +}; > + > /** > * struct pci_epc_bar_desc - hardware description for a BAR > * @type: the type of the BAR > @@ -216,11 +240,15 @@ enum pci_epc_bar_type { > * (If BARx is a 64-bit BAR that an EPF driver is not allowed to > * touch, then both BARx and BARx+1 must be set to type > * BAR_RESERVED.) > + * @nr_rsvd_regions: number of fixed subregions described for BAR_RESERVED > + * @rsvd_regions: fixed subregions behind BAR_RESERVED > */ > struct pci_epc_bar_desc { > enum pci_epc_bar_type type; > u64 fixed_size; > bool only_64bit; > + u8 nr_rsvd_regions; > + const struct pci_epc_bar_rsvd_region *rsvd_regions; > }; > > /**