Current we are using PCIBIOS_MAX_MEM_32 (4G limit) directly in the
pci_bus_alloc_resource to make sure that don't allocate too high
pref 64bit above 4G in the system that does not support that.
That is not right, as allocate_resource() should take resource limit.
Add pci_clip_resource() and use it check the pci bus address limit.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
drivers/pci/bus.c | 41 ++++++++++++++++++++++++++++++++++-------
1 file changed, 34 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 1ffd95b..e75bb17 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -98,6 +98,25 @@ void pci_bus_remove_resources(struct pci_bus *bus)
}
}
+static struct pci_bus_region pci_mem_32 = {0, 0xffffffff};
+
+static void pci_clip_resource(struct resource *res, struct pci_bus *bus,
+ struct pci_bus_region *region)
+{
+ struct pci_bus_region r;
+
+ __pcibios_resource_to_bus(bus, &r, res);
+ if (r.start < region->start)
+ r.start = region->start;
+ if (r.end > region->end)
+ r.end = region->end;
+
+ if (r.end < r.start)
+ res->end = res->start - 1;
+ else
+ __pcibios_bus_to_resource(bus, res, &r);
+}
+
/**
* pci_bus_alloc_resource - allocate a resource from a parent bus
* @bus: PCI bus
@@ -125,15 +144,12 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct
resource *res,
{
int i, ret = -ENOMEM;
struct resource *r;
- resource_size_t max = -1;
type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
- /* don't allocate too high if the pref mem doesn't support 64bit*/
- if (!(res->flags & IORESOURCE_MEM_64))
- max = PCIBIOS_MAX_MEM_32;
-
pci_bus_for_each_resource(bus, r, i) {
+ struct resource avail;
+
if (!r)
continue;
@@ -147,10 +163,21 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct
resource *res,
!(res->flags & IORESOURCE_PREFETCH))
continue;
+ /*
+ * don't allocate too high if the pref mem doesn't
+ * support 64bit.
+ */
+ avail = *r;
+ if (!(res->flags & IORESOURCE_MEM_64)) {
+ pci_clip_resource(&avail, bus, &pci_mem_32);
+ if (!resource_size(&avail))
+ continue;
+ }
+
/* Ok, try it out.. */
ret = allocate_resource(r, res, size,
- r->start ? : min,
- max, align,
+ max(avail.start, r->start ? : min),
+ avail.end, align,
alignf, alignf_data);
if (ret == 0)
break;
--
1.8.1.4
--
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