[PATCH v6 10/30] PCI: Prohibit assigning BARs and bridge windows to non-direct parents

[Sergey Miroshnichenko]

When movable BARs are enabled, the feature of resource relocating from
commit 2bbc6942273b5 ("PCI : ability to relocate assigned pci-resources")
is not used. Instead, inability to assign a resource is used as a signal
to retry BAR assignment with other configuration of bridge windows.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko at yadro.com>
---
 drivers/pci/setup-bus.c |  2 ++
 drivers/pci/setup-res.c | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index ff33b47b1bb7..cf325daae1b1 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1355,6 +1355,8 @@ static void pdev_assign_fixed_resources(struct pci_dev *dev)
 		while (b && !r->parent) {
 			assign_fixed_resource_on_bus(b, r);
 			b = b->parent;
+			if (!r->parent && pci_can_move_bars)
+				break;
 		}
 	}
 }
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index d8ca40a97693..a1657a8bf93d 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -298,6 +298,18 @@ static int _pci_assign_resource(struct pci_dev *dev, int resno,
 
 	bus = dev->bus;
 	while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
+		if (pci_can_move_bars) {
+			if (resno >= PCI_BRIDGE_RESOURCES &&
+			    resno <= PCI_BRIDGE_RESOURCE_END) {
+				struct resource *res = dev->resource + resno;
+
+				res->start = 0;
+				res->end = 0;
+				res->flags = 0;
+			}
+			break;
+		}
+
 		if (!bus->parent || !bus->self->transparent)
 			break;
 		bus = bus->parent;
-- 
2.23.0