[PATCH v3 3/4] PCI: of: Refactor the check for non-prefetchable 32-bit window

Punit Agrawal
2021-06-07T11:33:43Z

Recently, an override was added for non-prefetchable host bridge
windows below 4GB that have the 64-bit address attribute set. As many
of the conditions for the check overlap with the check for
non-prefetchable window size, refactor the code to unify the ranges
validation into devm_of_pci_get_host_bridge_resources().

As an added benefit, the warning message is now printed right after
the range mapping giving the user a better indication of where the
issue is.

Signed-off-by: Punit Agrawal <punitagrawal@gmail.com>
Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Vidya Sagar <vidyas@nvidia.com>
---
drivers/pci/of.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 38fe2589beb0..0580c654127e 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -355,11 +355,15 @@ static int devm_of_pci_get_host_bridge_resources(struct device *dev,
*io_base = range.cpu_addr;
} else if (resource_type(res) == IORESOURCE_MEM) {
if (!(res->flags & IORESOURCE_PREFETCH)) {
- if (res->flags & IORESOURCE_MEM_64)
+ if (res->flags & IORESOURCE_MEM_64) {
if (!upper_32_bits(range.pci_addr + range.size - 1)) {
dev_warn(dev, "Clearing 64-bit flag for non-prefetchable memory below 4GB\n");
res->flags &= ~IORESOURCE_MEM_64;
}
+ } else {
+ if (upper_32_bits(resource_size(res)))
+ dev_warn(dev, "Memory resource size exceeds max for 32 bits\n");
+ }
}
}

@@ -579,12 +583,6 @@ 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 (!(res->flags & IORESOURCE_MEM_64) &&
- upper_32_bits(resource_size(res)))
- dev_warn(dev, "Memory resource size exceeds max for 32 bits\n");
-
break;
}
}
--
2.30.2