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Mon, 6 Apr 2026 16:34:29 +0000 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 06 Apr 2026 17:34:28 +0100 Message-Id: Cc: "John Hubbard" , "Alistair Popple" , "Joel Fernandes" , "Timur Tabi" , , , Subject: Re: [PATCH] gpu: nova-core: require little endian From: "Gary Guo" To: "Eliot Courtney" , "Danilo Krummrich" , "Alexandre Courbot" , "Alice Ryhl" , "David Airlie" , "Simona Vetter" X-Mailer: aerc 0.21.0 References: <20260406-fix-kconfig-v1-1-8f634499f7f0@nvidia.com> In-Reply-To: <20260406-fix-kconfig-v1-1-8f634499f7f0@nvidia.com> X-ClientProxiedBy: LNXP265CA0093.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:76::33) To LOVP265MB8871.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:488::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LOVP265MB8871:EE_|CWLP265MB5706:EE_ X-MS-Office365-Filtering-Correlation-Id: e0a98144-b077-4ff3-be9b-08de93fa6018 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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For > example, all the code that reads RPCs out of the command queue just > directly interprets the bytes. > > Make this explicit in Kconfig. > > Signed-off-by: Eliot Courtney > --- > The current code assumes little endian in a bunch of places. I think we > should either explicitly decide to be generic on endianness or explicitly > decide not to - having some handling sprinkled around in various > locations seems confusing to me. > > I believe that currently e.g. `RUST` transitively depends on > !CPU_BIG_ENDIAN, so this is more about making the decision explicit for > nova-core rather than fixing any kind of hole. IBM is adding PowerPC support which will be the first BE architecture that = RfL is going to support. However, only 32-bit BE is going to be added soon, so `depends on 64BIT` will prevent Nova from supporting that. So I think it's good that we put it in. Acked-by: Gary Guo Best, Gary > --- > drivers/gpu/nova-core/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/nova-core/Kconfig b/drivers/gpu/nova-core/Kconfi= g > index a4f2380654e2..d8456f8eaa05 100644 > --- a/drivers/gpu/nova-core/Kconfig > +++ b/drivers/gpu/nova-core/Kconfig > @@ -3,6 +3,7 @@ config NOVA_CORE > depends on 64BIT > depends on PCI > depends on RUST > + depends on !CPU_BIG_ENDIAN > select AUXILIARY_BUS > select RUST_FW_LOADER_ABSTRACTIONS > default n > > --- > base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd > change-id: 20260406-fix-kconfig-3a059f622697 > > Best regards, > -- =20 > Eliot Courtney