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PCI: Add pci_bus_clip_resource() to clip to fit upstream window

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Add pci_bus_clip_resource().  If a PCI-PCI bridge window overlaps an
upstream bridge window but is not completely contained by it, this clips
the downstream window so it fits inside the upstream one.

No functional change (this adds the function but no callers).

[bhelgaas: changelog, split into separate patch]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491
Reported-by: Marek Kordik <kordikmarek@gmail.com>
Fixes: 5b28541552 ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources")
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.16+
This commit is contained in:
Yinghai Lu 2015-01-15 16:21:49 -06:00 committed by Bjorn Helgaas
parent 3f2f4dc456
commit 0f7e7aee2f
2 changed files with 44 additions and 0 deletions
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43
drivers/pci/bus.c
View File

@ -228,6 +228,49 @@ int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
}
EXPORT_SYMBOL(pci_bus_alloc_resource);
/*
* The @idx resource of @dev should be a PCI-PCI bridge window. If this
* resource fits inside a window of an upstream bridge, do nothing. If it
* overlaps an upstream window but extends outside it, clip the resource so
* it fits completely inside.
*/
bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
{
struct pci_bus *bus = dev->bus;
struct resource *res = &dev->resource[idx];
struct resource orig_res = *res;
struct resource *r;
int i;
pci_bus_for_each_resource(bus, r, i) {
resource_size_t start, end;
if (!r)
continue;
if (resource_type(res) != resource_type(r))
continue;
start = max(r->start, res->start);
end = min(r->end, res->end);
if (start > end)
continue; /* no overlap */
if (res->start == start && res->end == end)
return false; /* no change */
res->start = start;
res->end = end;
dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
&orig_res, res);
return true;
}
return false;
}
void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
/**

1
drivers/pci/pci.h
View File

@ -208,6 +208,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus,
void __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head);
bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
/**
* pci_ari_enabled - query ARI forwarding status