linux-kernel - [PATCH 1/1] of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses

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Message-Id: <20210415180050.373791-1-leobras.c@gmail.com>
Date:   Thu, 15 Apr 2021 15:00:51 -0300
From:   Leonardo Bras <leobras.c@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>, aik@...abs.ru
Cc:     Leonardo Bras <leobras.c@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses

Many other resource flag parsers already add this flag when the input
has bits 24 & 25 set, so update this one to do the same.

Some devices (like virtio-net) have more than one memory resource
(like MMIO32 and MMIO64) and without this flag it would be needed to
verify the address range to know which one is which.

Signed-off-by: Leonardo Bras <leobras.c@...il.com>
---
 drivers/of/address.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 73ddf2540f3f..dc7147843783 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -116,9 +116,12 @@ static unsigned int of_bus_pci_get_flags(const __be32 *addr)
 		flags |= IORESOURCE_IO;
 		break;
 	case 0x02: /* 32 bits */
-	case 0x03: /* 64 bits */
 		flags |= IORESOURCE_MEM;
 		break;
+
+	case 0x03: /* 64 bits */
+		flags |= IORESOURCE_MEM | IORESOURCE_MEM_64;
+		break;
 	}
 	if (w & 0x40000000)
 		flags |= IORESOURCE_PREFETCH;
-- 
2.30.2