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[v2,2/4] PCI: of: Relax the condition for warning about non-prefetchable memory aperture size

Message ID 20210531221057.3406958-3-punitagrawal@gmail.com (mailing list archive)
State New, archived
Headers show
Series PCI: of: Improvements to handle 64-bit attribute for non-prefetchable ranges | expand

Commit Message

Punit Agrawal May 31, 2021, 10:10 p.m. UTC 
Commit fede8526cc48 ("PCI: of: Warn if non-prefetchable memory
aperture size is > 32-bit") introduced a warning for non-prefetchable
resources that need more than 32bits to resolve. It turns out that the
check is too restrictive and should be applicable to only resources
that are limited to host bridge windows that don't have the ability to
map 64-bit address space.

Relax the condition to only warn when the resource size requires >
32-bits and doesn't allow mapping to 64-bit addresses.

Link: https://lore.kernel.org/r/7a1e2ebc-f7d8-8431-d844-41a9c36a8911@arm.com
Signed-off-by: Punit Agrawal <punitagrawal@gmail.com>
Cc: Vidya Sagar <vidyas@nvidia.com>
---
 drivers/pci/of.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index e2e64c5c55cb..c2a57c61f1d1 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -574,7 +574,8 @@  static int pci_parse_request_of_pci_ranges(struct device *dev,
 			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
 
 			if (!(res->flags & IORESOURCE_PREFETCH))
-				if (upper_32_bits(resource_size(res)))
+				if (!(res->flags & IORESOURCE_MEM_64) &&
+				    upper_32_bits(resource_size(res)))
 					dev_warn(dev, "Memory resource size exceeds max for 32 bits\n");
 
 			break;