[RFC/RFT PATCH 2/2] ARM64: kernel: pci: implement PCI device resources claiming

[Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>]

When a device is scanned and added to the PCI bus, its resources
should be claimed to validate the BARs configuration and to assign
them a parent resource so that the resource hierarchy can be sanity
checked.

This patch adds code that carries out PCI device resources claiming to
the ARM64 pcibios_add_device implementation so that device resources
are claimed by the core PCI layer upon PCI device initialization on
ARM64 systems.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
---
 arch/arm64/kernel/pci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 4095379..c0a88ca 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -43,8 +43,18 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
  */
 int pcibios_add_device(struct pci_dev *dev)
 {
+	struct resource *res;
+	int i;
+
 	dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
 
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		res = &dev->resource[i];
+		if (res->parent || !res->flags)
+			continue;
+		pci_claim_resource(dev, i);
+	}
+
 	return 0;
 }
 
-- 
2.2.1