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PCI: Add defines for bridge window indexing 

include/linux/pci.h provides PCI_BRIDGE_{IO,MEM,PREF_MEM}_WINDOW defines,
however, they're based on the resource array indexing in the pci_dev
struct. The struct pci_bus also has pointers to those same resources but
they start from zeroth index.

Add PCI_BUS_BRIDGE_{IO,MEM,PREF_MEM}_WINDOW defines to get rid of literal
indexing.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250829131113.36754-12-ilpo.jarvinen@linux.intel.com
This commit is contained in:
Ilpo Järvinen 2025-08-29 16:11:00 +03:00 committed by Bjorn Helgaas
parent 8278c69143
commit e4934832c5
2 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/pci/pci.h
View File

@ -81,6 +81,10 @@ struct pcie_tlp_log;
#define PCIE_MSG_CODE_DEASSERT_INTC 0x26
#define PCIE_MSG_CODE_DEASSERT_INTD 0x27
#define PCI_BUS_BRIDGE_IO_WINDOW 0
#define PCI_BUS_BRIDGE_MEM_WINDOW 1
#define PCI_BUS_BRIDGE_PREF_MEM_WINDOW 2
extern const unsigned char pcie_link_speed[];
extern bool pci_early_dump;

10
drivers/pci/probe.c
View File

@ -598,9 +598,13 @@ void pci_read_bridge_bases(struct pci_bus *child)
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
pci_read_bridge_io(child->self, child->resource[0], false);
pci_read_bridge_mmio(child->self, child->resource[1], false);
pci_read_bridge_mmio_pref(child->self, child->resource[2], false);
pci_read_bridge_io(child->self,
child->resource[PCI_BUS_BRIDGE_IO_WINDOW], false);
pci_read_bridge_mmio(child->self,
child->resource[PCI_BUS_BRIDGE_MEM_WINDOW], false);
pci_read_bridge_mmio_pref(child->self,
child->resource[PCI_BUS_BRIDGE_PREF_MEM_WINDOW],
false);
if (!dev->transparent)
return;