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PCI: add pci_create_root_bus() that accepts resource list

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pci_create_bus() assigns ioport_resource and iomem_resource as the default
bus resources, i.e., the entire address space.  Architectures fix these
later, typically in pcibios_fixup_bus() or after pci_scan_bus_parented()
returns, but code that runs in the interim sees incorrect resource
information.

This patch adds a new pci_create_root_bus() that sets the bus resources
correctly from a supplied list of resources.

I intend to remove pci_create_bus() after changing all callers.

Based on original patch by Deng-Cheng Zhu.

Reference: http://www.spinics.net/lists/mips/msg41654.html
Reference: https://lkml.org/lkml/2011/8/26/88
Signed-off-by: Deng-Cheng Zhu <dczhu@mips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2011-10-28 16:25:45 -06:00 committed by Jesse Barnes
parent a9d9f5276c
commit 166c637075
2 changed files with 24 additions and 4 deletions
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25
drivers/pci/probe.c
View File

@ -1522,12 +1522,13 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
return max;
}
struct pci_bus * pci_create_bus(struct device *parent,
int bus, struct pci_ops *ops, void *sysdata)
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
int error, i;
struct pci_bus *b, *b2;
struct device *dev;
struct pci_bus_resource *bus_res, *n;
struct resource *res;
b = pci_alloc_bus();
@ -1578,8 +1579,10 @@ struct pci_bus * pci_create_bus(struct device *parent,
pci_create_legacy_files(b);
b->number = b->secondary = bus;
b->resource[0] = &ioport_resource;
b->resource[1] = &iomem_resource;
/* Add initial resources to the bus */
list_for_each_entry_safe(bus_res, n, resources, list)
list_move_tail(&bus_res->list, &b->resources);
if (parent)
dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
@ -1605,6 +1608,20 @@ struct pci_bus * pci_create_bus(struct device *parent,
return NULL;
}
struct pci_bus *pci_create_bus(struct device *parent,
int bus, struct pci_ops *ops, void *sysdata)
{
LIST_HEAD(resources);
struct pci_bus *b;
pci_add_resource(&resources, &ioport_resource);
pci_add_resource(&resources, &iomem_resource);
b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
if (!b)
pci_free_resource_list(&resources);
return b;
}
struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
int bus, struct pci_ops *ops, void *sysdata)
{

3
include/linux/pci.h
View File

@ -670,6 +670,9 @@ static inline struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *o
pci_bus_add_devices(root_bus);
return root_bus;
}
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
struct pci_bus *pci_create_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,