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Merge branch 'pci/kevin-bus-to-resource' into next

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* pci/kevin-bus-to-resource:
  PCI: Unset resource if initial BAR value is invalid
  PCI: Consolidate calls to pcibios_bus_to_resource() in __pci_read_base()
  PCI: Add 0x prefix to BAR register position in __pci_read_base()
This commit is contained in:
Bjorn Helgaas 2013-05-25 17:44:24 -06:00
commit b194dbf5ee
1 changed files with 25 additions and 6 deletions
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31
drivers/pci/probe.c
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@ -170,7 +170,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
{
u32 l, sz, mask;
u16 orig_cmd;
struct pci_bus_region region;
struct pci_bus_region region, inverted_region;
bool bar_too_big = false, bar_disabled = false;
mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
@ -250,12 +250,10 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
pci_write_config_dword(dev, pos + 4, 0);
region.start = 0;
region.end = sz64;
pcibios_bus_to_resource(dev, res, &region);
bar_disabled = true;
} else {
region.start = l64;
region.end = l64 + sz64;
pcibios_bus_to_resource(dev, res, &region);
}
} else {
sz = pci_size(l, sz, mask);
@ -265,7 +263,28 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
region.start = l;
region.end = l + sz;
pcibios_bus_to_resource(dev, res, &region);
}
pcibios_bus_to_resource(dev, res, &region);
pcibios_resource_to_bus(dev, &inverted_region, res);
/*
* If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
* the corresponding resource address (the physical address used by
* the CPU. Converting that resource address back to a bus address
* should yield the original BAR value:
*
* resource_to_bus(bus_to_resource(A)) == A
*
* If it doesn't, CPU accesses to "bus_to_resource(A)" will not
* be claimed by the device.
*/
if (inverted_region.start != region.start) {
dev_info(&dev->dev, "reg 0x%x: initial BAR value %pa invalid; forcing reassignment\n",
pos, &region.start);
res->flags |= IORESOURCE_UNSET;
res->end -= res->start;
res->start = 0;
}
goto out;
@ -278,9 +297,9 @@ out:
pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
if (bar_too_big)
dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", pos);
dev_err(&dev->dev, "reg 0x%x: can't handle 64-bit BAR\n", pos);
if (res->flags && !bar_disabled)
dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
}