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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 cover only a portion of a BAR. 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. No controller-specific implementation is added in this commit. Signed-off-by: Koichiro Den --- include/linux/pci-epf.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 48f68c4dcfa5..164768db85f6 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -110,6 +110,24 @@ 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 - represents a BAR subrange for inbound mappi= ng + * @phys_addr: physical address that should be mapped to the BAR subrange + * @size: the size of the subrange to be mapped + * @offset: The byte offset from the BAR base + * + * When pci_epf_bar.use_submap is set, an EPF driver may describe multiple + * independent mappings within a single BAR. An EPC driver can use these + * descriptors to set up the required address translation (e.g. multiple + * inbound iATU regions) without requiring the whole BAR to be mapped at + * once. + */ +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 +137,9 @@ 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 */ struct pci_epf_bar { dma_addr_t phys_addr; @@ -127,6 +148,11 @@ struct pci_epf_bar { size_t mem_size; enum pci_barno barno; int flags; + + /* Optional sub-range mapping */ + bool use_submap; + int num_submap; + struct pci_epf_bar_submap *submap; }; =20 /** --=20 2.51.0 From nobody Sun Feb 8 22:22:30 2026 Received: from OS0P286CU010.outbound.protection.outlook.com (mail-japanwestazon11021121.outbound.protection.outlook.com [40.107.74.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 218F020DD75; 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charset="utf-8" Extend dw_pcie_ep_set_bar() to support inbound mappings for BAR subranges using Address Match Mode IB iATU. Refactor the existing BAR-match helper into dw_pcie_ep_ib_atu_bar() and introduce dw_pcie_ep_ib_atu_addr() for address-match mode. When an endpoint function requests subrange mapping via pci_epf_bar.submap, the DesignWare PCIe endpoint controller programs an inbound iATU entry that matches only the specified address range within the BAR. This builds on the generic BAR subrange mapping support added in the PCI endpoint core. Signed-off-by: Koichiro Den --- .../pci/controller/dwc/pcie-designware-ep.c | 198 ++++++++++++++++-- drivers/pci/controller/dwc/pcie-designware.h | 2 + 2 files changed, 188 insertions(+), 12 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/= controller/dwc/pcie-designware-ep.c index 1195d401df19..d1e50e9989ed 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -139,9 +139,10 @@ static int dw_pcie_ep_write_header(struct pci_epc *epc= , u8 func_no, u8 vfunc_no, return 0; } =20 -static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int t= ype, - dma_addr_t parent_bus_addr, enum pci_barno bar, - size_t size) +/* Bar match mode */ +static int dw_pcie_ep_ib_atu_bar(struct dw_pcie_ep *ep, u8 func_no, int ty= pe, + dma_addr_t parent_bus_addr, enum pci_barno bar, + size_t size) { int ret; u32 free_win; @@ -174,6 +175,151 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *= ep, u8 func_no, int type, return 0; } =20 +struct dw_pcie_ib_map { + struct list_head list; + enum pci_barno bar; + u64 pci_addr; + u64 parent_bus_addr; + u64 size; + u32 index; +}; + +static struct dw_pcie_ib_map * +dw_pcie_ep_find_ib_map(struct dw_pcie_ep *ep, enum pci_barno bar, u64 pci_= addr) +{ + struct dw_pcie_ib_map *m; + + list_for_each_entry(m, &ep->ib_map_list, list) { + if (m->bar =3D=3D bar && m->pci_addr =3D=3D pci_addr) + return m; + } + + return NULL; +} + +static u64 dw_pcie_ep_read_bar_assigned(struct dw_pcie_ep *ep, u8 func_no, + enum pci_barno bar, int flags) +{ + u32 reg =3D PCI_BASE_ADDRESS_0 + (4 * bar); + u32 lo, hi; + u64 addr; + + lo =3D dw_pcie_ep_readl_dbi(ep, func_no, reg); + + if (flags & PCI_BASE_ADDRESS_SPACE) + return lo & PCI_BASE_ADDRESS_IO_MASK; + + addr =3D lo & PCI_BASE_ADDRESS_MEM_MASK; + if (!(flags & PCI_BASE_ADDRESS_MEM_TYPE_64)) + return addr; + + hi =3D dw_pcie_ep_readl_dbi(ep, func_no, reg + 4); + return addr | ((u64)hi << 32); +} + +/* Address match mode */ +static int dw_pcie_ep_ib_atu_addr(struct dw_pcie_ep *ep, u8 func_no, int t= ype, + struct pci_epf_bar *epf_bar) +{ + struct pci_epf_bar_submap *submap =3D epf_bar->submap; + struct dw_pcie *pci =3D to_dw_pcie_from_ep(ep); + enum pci_barno bar =3D epf_bar->barno; + struct dw_pcie_ib_map *m, *new; + struct device *dev =3D pci->dev; + u64 pci_addr, parent_bus_addr; + u64 size, off, base; + unsigned long flags; + int free_win, ret; + u32 i; + + if (!epf_bar->num_submap) + return 0; + + if (!submap) + return -EINVAL; + + base =3D dw_pcie_ep_read_bar_assigned(ep, func_no, bar, epf_bar->flags); + if (!base) { + dev_err(dev, + "BAR%u not assigned, cannot set up sub-range mappings\n", + bar); + return -EINVAL; + } + + for (i =3D 0; i < epf_bar->num_submap; i++) { + off =3D submap[i].offset; + size =3D submap[i].size; + parent_bus_addr =3D submap[i].phys_addr; + + if (!size) + continue; + + if (off > (~0ULL) - base) + return -EINVAL; + + pci_addr =3D base + off; + + new =3D devm_kzalloc(dev, sizeof(*new), GFP_KERNEL); + if (!new) + return -ENOMEM; + + spin_lock_irqsave(&ep->ib_map_lock, flags); + m =3D dw_pcie_ep_find_ib_map(ep, bar, pci_addr); + if (m) { + if (m->parent_bus_addr =3D=3D parent_bus_addr && + m->size =3D=3D size) { + spin_unlock_irqrestore(&ep->ib_map_lock, flags); + devm_kfree(dev, new); + continue; + } + + ret =3D dw_pcie_prog_inbound_atu(pci, m->index, type, + parent_bus_addr, pci_addr, + size); + if (!ret) { + m->parent_bus_addr =3D parent_bus_addr; + m->size =3D size; + } + spin_unlock_irqrestore(&ep->ib_map_lock, flags); + devm_kfree(dev, new); + if (ret) + return ret; + continue; + } + + free_win =3D find_first_zero_bit(ep->ib_window_map, + pci->num_ib_windows); + if (free_win >=3D pci->num_ib_windows) { + spin_unlock_irqrestore(&ep->ib_map_lock, flags); + devm_kfree(dev, new); + return -ENOSPC; + } + set_bit(free_win, ep->ib_window_map); + + new->bar =3D bar; + new->index =3D free_win; + new->pci_addr =3D pci_addr; + new->parent_bus_addr =3D parent_bus_addr; + new->size =3D size; + list_add_tail(&new->list, &ep->ib_map_list); + + spin_unlock_irqrestore(&ep->ib_map_lock, flags); + + ret =3D dw_pcie_prog_inbound_atu(pci, free_win, type, + parent_bus_addr, pci_addr, size); + if (ret) { + spin_lock_irqsave(&ep->ib_map_lock, flags); + list_del(&new->list); + clear_bit(free_win, ep->ib_window_map); + spin_unlock_irqrestore(&ep->ib_map_lock, flags); + devm_kfree(dev, new); + return ret; + } + } + + return 0; +} + static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, struct dw_pcie_ob_atu_cfg *atu) { @@ -204,17 +350,35 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc,= u8 func_no, u8 vfunc_no, struct dw_pcie_ep *ep =3D epc_get_drvdata(epc); struct dw_pcie *pci =3D to_dw_pcie_from_ep(ep); enum pci_barno bar =3D epf_bar->barno; - u32 atu_index =3D ep->bar_to_atu[bar] - 1; + struct dw_pcie_ib_map *m, *tmp; + struct device *dev =3D pci->dev; + u32 atu_index; =20 - if (!ep->bar_to_atu[bar]) + if (!ep->epf_bar[bar]) return; =20 __dw_pcie_ep_reset_bar(pci, func_no, bar, epf_bar->flags); =20 - dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, atu_index); - clear_bit(atu_index, ep->ib_window_map); + /* BAR match iATU */ + if (ep->bar_to_atu[bar]) { + atu_index =3D ep->bar_to_atu[bar] - 1; + dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, atu_index); + clear_bit(atu_index, ep->ib_window_map); + ep->bar_to_atu[bar] =3D 0; + } + + /* Address match iATU */ + guard(spinlock_irqsave)(&ep->ib_map_lock); + list_for_each_entry_safe(m, tmp, &ep->ib_map_list, list) { + if (m->bar !=3D bar) + continue; + dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, m->index); + clear_bit(m->index, ep->ib_window_map); + list_del(&m->list); + devm_kfree(dev, m); + } + ep->epf_bar[bar] =3D NULL; - ep->bar_to_atu[bar] =3D 0; } =20 static unsigned int dw_pcie_ep_get_rebar_offset(struct dw_pcie *pci, @@ -364,10 +528,14 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8= func_no, u8 vfunc_no, /* * We can only dynamically change a BAR if the new BAR size and * BAR flags do not differ from the existing configuration. + * When 'use_submap' is set and the intention is to create + * sub-range mappings perhaps incrementally, epf_bar->size + * does not mean anything so no need to validate it. */ if (ep->epf_bar[bar]->barno !=3D bar || - ep->epf_bar[bar]->size !=3D size || - ep->epf_bar[bar]->flags !=3D flags) + ep->epf_bar[bar]->flags !=3D flags || + ep->epf_bar[bar]->use_submap !=3D epf_bar->use_submap || + (!epf_bar->use_submap && ep->epf_bar[bar]->size !=3D size)) return -EINVAL; =20 /* @@ -408,8 +576,12 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 = func_no, u8 vfunc_no, else type =3D PCIE_ATU_TYPE_IO; =20 - ret =3D dw_pcie_ep_inbound_atu(ep, func_no, type, epf_bar->phys_addr, bar, - size); + if (epf_bar->use_submap) + ret =3D dw_pcie_ep_ib_atu_addr(ep, func_no, type, epf_bar); + else + ret =3D dw_pcie_ep_ib_atu_bar(ep, func_no, type, + epf_bar->phys_addr, bar, size); + if (ret) return ret; =20 @@ -1120,6 +1292,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) struct device *dev =3D pci->dev; =20 INIT_LIST_HEAD(&ep->func_list); + INIT_LIST_HEAD(&ep->ib_map_list); + spin_lock_init(&ep->ib_map_lock); ep->msi_iatu_mapped =3D false; ep->msi_msg_addr =3D 0; ep->msi_map_size =3D 0; diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/con= troller/dwc/pcie-designware.h index f87c67a7a482..1ebe8a9ee139 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -479,6 +479,8 @@ struct dw_pcie_ep { phys_addr_t *outbound_addr; unsigned long *ib_window_map; unsigned long *ob_window_map; + struct list_head ib_map_list; + spinlock_t ib_map_lock; void __iomem *msi_mem; phys_addr_t msi_mem_phys; struct pci_epf_bar *epf_bar[PCI_STD_NUM_BARS]; --=20 2.51.0