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Fri, 13 Mar 2026 09:54:07 -0700 From: Zhi Wang To: , , , , , , CC: , , , , , , , , , , , , , , , , "Zhi Wang" Subject: [RFC v2 03/10] gpu: nova-core: return FSP response buffer to caller Date: Fri, 13 Mar 2026 18:53:27 +0200 Message-ID: <20260313165336.935771-4-zhiw@nvidia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260313165336.935771-1-zhiw@nvidia.com> References: <20260313165336.935771-1-zhiw@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000014:EE_|MW6PR12MB8835:EE_ X-MS-Office365-Filtering-Correlation-Id: 8c2e05d8-c844-4744-5e2d-08de81213578 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700016|1800799024|82310400026|56012099003|22082099003|18002099003; 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charset="utf-8" Change send_sync_fsp() to return the raw response buffer after validating the common MCTP/NVDM headers and error code. This allows callers to perform protocol-specific parsing on the response payload, which is needed for the upcoming PRC protocol support. For the existing COT caller, the response buffer is unused. Signed-off-by: Zhi Wang --- drivers/gpu/nova-core/fsp.rs | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/nova-core/fsp.rs b/drivers/gpu/nova-core/fsp.rs index 477ed719b757..69e48b655879 100644 --- a/drivers/gpu/nova-core/fsp.rs +++ b/drivers/gpu/nova-core/fsp.rs @@ -454,12 +454,13 @@ pub(crate) fn boot_fmc( } =20 /// Send message to FSP and wait for response. + /// Returns the raw response buffer for protocol-specific parsing. fn send_sync_fsp( dev: &device::Device, bar: &crate::driver::Bar0, fsp_falcon: &crate::falcon::Falcon, msg: &M, - ) -> Result + ) -> Result> where M: MessageToFsp, { @@ -482,12 +483,13 @@ fn send_sync_fsp( response_buf.resize(packet_size, 0, GFP_KERNEL)?; fsp_falcon.recv_msg(bar, &mut response_buf, packet_size)?; =20 - if response_buf.len() < core::mem::size_of::() { + let min_size =3D core::mem::size_of::(); + if response_buf.len() < min_size { dev_err!(dev, "FSP response too small: {}\n", response_buf.len= ()); return Err(EIO); } =20 - let response =3D FspResponse::from_bytes(&response_buf[..]).ok_or(= EIO)?; + let response =3D FspResponse::from_bytes(&response_buf[..min_size]= ).ok_or(EIO)?; =20 let mctp_header: MctpHeader =3D response.header.mctp_header.into(); let nvdm_header: NvdmHeader =3D response.header.nvdm_header.into(); @@ -532,6 +534,6 @@ fn send_sync_fsp( return Err(EIO); } =20 - Ok(()) + Ok(response_buf) } } --=20 2.51.0