From: David Daney <david.da...@cavium.com>
The new Enhanced Allocation (EA) capability support (patches to
follow) creates resources with the IORESOURCE_PCI_FIXED set. During
resource assignment in pci_bus_assign_resources(),
IORESOURCE_PCI_FIXED resources are not given a parent. This, in turn,
causes pci_enable_resources() to fail with a "not claimed" error.
So, In __pci_bus_assign_resources(), for IORESOURCE_PCI_FIXED resources,
try to request the resource from a parent bus.
Acked-by: Sean O. Stalley <sean.stal...@intel.com>
Signed-off-by: David Daney <david.da...@cavium.com>
---
drivers/pci/setup-bus.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 4dfef10..7239a2c 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1341,6 +1341,47 @@ void pci_bus_size_bridges(struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_size_bridges);
+static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
+{
+ int i;
+ struct resource *parent_r;
+ unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ pci_bus_for_each_resource(b, parent_r, i) {
+ if (!parent_r)
+ continue;
+
+ if ((r->flags & mask) == (parent_r->flags & mask) &&
+ resource_contains(parent_r, r))
+ request_resource(parent_r, r);
+ }
+}
+
+/*
+ * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they
+ * are skipped by pbus_assign_resources_sorted().
+ */
+static void pdev_assign_fixed_resources(struct pci_dev *dev)
+{
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ struct pci_bus *b;
+ struct resource *r = &dev->resource[i];
+
+ if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
+ !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+ continue;
+
+ b = dev->bus;
+ while (b && !r->parent) {
+ assign_fixed_resource_on_bus(b, r);
+ b = b->parent;
+ }
+ }
+}
+
void __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head)
@@ -1351,6 +1392,8 @@ void __pci_bus_assign_resources(const struct pci_bus *bus,
pbus_assign_resources_sorted(bus, realloc_head, fail_head);
list_for_each_entry(dev, &bus->devices, bus_list) {
+ pdev_assign_fixed_resources(dev);
+
b = dev->subordinate;
if (!b)
continue;
--
1.9.1
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