From: Vidya Sagar <vidyas@nvidia.com>
Date: Wed, 18 Nov 2020 20:16:25 +0530
Subject: PCI: of: Warn if non-prefetchable memory aperture size is > 32-bit
Git-commit: fede8526cc4880d2a1ac4cfe357c299c4e1fd848
Patch-mainline: v5.11-rc1
References: bsc#1179344
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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/pci/of.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index ac24cd5439a9..5ea472ae22ac 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -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;
}
}
--
2.26.2