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PCI: of: Warn if non-prefetchable memory aperture size is > 32-bit 

As per PCIe spec r5.0, sec 7.5.1.3.8 only 32-bit BAR registers are defined
for non-prefetchable memory and hence a warning should be reported when
the size of them go beyond 32-bits.

Link: https://lore.kernel.org/r/20201118144626.32189-2-vidyas@nvidia.com
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Vidya Sagar 2020-11-18 20:16:25 +05:30 committed by Lorenzo Pieralisi
parent 9f9e59a480
commit fede8526cc
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/of.c
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@ -556,6 +556,11 @@ static int pci_parse_request_of_pci_ranges(struct device *dev,
break;
case IORESOURCE_MEM:
res_valid |= !(res->flags & IORESOURCE_PREFETCH);
if (!(res->flags & IORESOURCE_PREFETCH))
if (upper_32_bits(resource_size(res)))
dev_warn(dev, "Memory resource size exceeds max for 32 bits\n");
break;
}
}