linux-kernel - [PATCH v3 2/4] PCI: of: Relax the condition for warning about non-prefetchable memory aperture size

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Message-Id: <20210607112856.3499682-3-punitagrawal@gmail.com>
Date:   Mon,  7 Jun 2021 20:28:54 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     helgaas@...nel.org, robh+dt@...nel.org
Cc:     Punit Agrawal <punitagrawal@...il.com>,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...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,
        Vidya Sagar <vidyas@...dia.com>
Subject: [PATCH v3 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>
Tested-by: Alexandru Elisei <alexandru.elisei@....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 1e45186a5715..38fe2589beb0 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -581,7 +581,8 @@ 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