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

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Message-Id: <20210531221057.3406958-3-punitagrawal@gmail.com>
Date:   Tue,  1 Jun 2021 07:10:55 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     linux-rockchip@...ts.infradead.org, linux-pci@...r.kernel.org
Cc:     Punit Agrawal <punitagrawal@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alexandru.elisei@....com, wqu@...e.com, robin.murphy@....com,
        pgwipeout@...il.com, ardb@...nel.org, briannorris@...omium.org,
        shawn.lin@...k-chips.com, helgaas@...nel.org, robh+dt@...nel.org,
        Vidya Sagar <vidyas@...dia.com>
Subject: [PATCH v2 2/4] PCI: of: Relax the condition for warning about non-prefetchable memory aperture size

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@...il.com>
Cc: Vidya Sagar <vidyas@...dia.com>
---
 drivers/pci/of.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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;
-- 
2.30.2