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PCI: Add pbus_validate_busn() for Bus Number validation

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pci_scan_bridge_extend() validates bus numbers but upcoming changes that
separate CardBus code into own function need to call that the same
validation.

Thus, add pbus_validate_busn for validating the Bus Numbers.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20251219174036.16738-23-ilpo.jarvinen@linux.intel.com
This commit is contained in:
Ilpo Järvinen 2025-12-19 19:40:35 +02:00 committed by Bjorn Helgaas
parent cad3337bb6
commit 3cbb40c3d4
2 changed files with 22 additions and 12 deletions
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1
drivers/pci/pci.h
View File

@ -501,6 +501,7 @@ static inline int pci_resource_num(const struct pci_dev *dev,
return resno;
}
void pbus_validate_busn(struct pci_bus *bus);
struct resource *pbus_select_window(struct pci_bus *bus,
const struct resource *res);
void pci_reassigndev_resource_alignment(struct pci_dev *dev);

33
drivers/pci/probe.c
View File

@ -1312,6 +1312,26 @@ static void pci_enable_rrs_sv(struct pci_dev *pdev)
static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus,
unsigned int available_buses);
void pbus_validate_busn(struct pci_bus *bus)
{
struct pci_bus *upstream = bus->parent;
struct pci_dev *bridge = bus->self;
/* Check that all devices are accessible */
while (upstream->parent) {
if ((bus->busn_res.end > upstream->busn_res.end) ||
(bus->number > upstream->busn_res.end) ||
(bus->number < upstream->number) ||
(bus->busn_res.end < upstream->number)) {
pci_info(bridge, "devices behind bridge are unusable because %pR cannot be assigned for them\n",
&bus->busn_res);
break;
}
upstream = upstream->parent;
}
}
/**
* pci_ea_fixed_busnrs() - Read fixed Secondary and Subordinate bus
* numbers from EA capability.
@ -1577,18 +1597,7 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
(is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
pci_domain_nr(bus), child->number);
/* Check that all devices are accessible */
while (bus->parent) {
if ((child->busn_res.end > bus->busn_res.end) ||
(child->number > bus->busn_res.end) ||
(child->number < bus->number) ||
(child->busn_res.end < bus->number)) {
dev_info(&dev->dev, "devices behind bridge are unusable because %pR cannot be assigned for them\n",
&child->busn_res);
break;
}
bus = bus->parent;
}
pbus_validate_busn(child);
out:
/* Clear errors in the Secondary Status Register */