pci_epc_set_bar() can be called with flag PCI_BASE_ADDRESS_MEM_TYPE_64,
and can thus request a BAR size larger than 4 GB.
However, the pcie-designware-ep.c driver currently doesn't handle
BAR sizes larger than 4 GB. (Since we are only writing the BAR_mask[x]
register and not the BAR_mask[x+1] register.)
For now, return an error when requesting a BAR size larger than 4 GB.
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
---
drivers/pci/dwc/pcie-designware-ep.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index 3a6feeff5f5b..efb65a7c06b8 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -126,6 +126,11 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
enum dw_pcie_as_type as_type;
u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
+ if (upper_32_bits(size)) {
+ dev_err(pci->dev, "can't handle BAR larger than 4GB\n");
+ return -EINVAL;
+ }
+
if (!(flags & PCI_BASE_ADDRESS_SPACE))
as_type = DW_PCIE_AS_MEM;
else
--
2.14.2
