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Fri, 21 Aug 2026 14:35:39 -0500 Received: from p8.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.45 via Frontend Transport; Fri, 21 Aug 2026 14:35:38 -0500 From: Alex Deucher To: CC: Mukul Joshi , Felix Kuehling , Alex Deucher Subject: [PATCH 45/95] drm/amdgpu: Control NPA DMA-buf importing Date: Fri, 21 Aug 2026 15:34:08 -0400 Message-ID: <20260821193458.808626-46-alexander.deucher@amd.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260821193458.808626-1-alexander.deucher@amd.com> References: <20260821193458.808626-1-alexander.deucher@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD81:EE_|SJ5PPFABE38415D:EE_ X-MS-Office365-Filtering-Correlation-Id: 9b2e0246-03df-4ff4-efff-08deffbb65fe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|23010399003|376014|36860700016|1800799024|82310400026|10067099003|56012099006|11063799006|18002099003|22082099003; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: uo1OCAIeLT/5nt7gPvbckSZAnoth5ldleNFsKQ/fyxp4zPCoikCxvV4VVE+Jg1U70HZLNM9hTUoWQxxk+zXpPXsIFt8d4S5Y6uwaHF7xGgSktDB4DBt6MmQVuiVLYkv6Xz4brc72kmBXaJK4hvDyfbLav3gXjbDRn6DgOTvR6Dy58c2PR7251svG9L3C+vQsUCxDWjsIX8BQ2R11k8B4KgF+NdNK6YdX25+UhJQtVbVOzZpy/cJqBVN94t0hb4aopDAq7VvwzHogiY9yA7OxU6zASdVktpcKlXt9PTCfnT3WUPeHkDU1a3caKYW7ffhA5082XCNB983vMeRWpaM6MKCvl3PSHfIdudEBR/qEKlcI9/PRw7PjHVy0MNiqxOEhfLtcP0hbd6T6LgQa03pMhva/vy2RTK6hrciEneqUYi9iHOLAg27OCmfRY8KXRv8Q X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2026 19:35:46.8067 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b2e0246-03df-4ff4-efff-08deffbb65fe X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD81.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPFABE38415D X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Mukul Joshi NPA DMA-Bufs can only be imported on the same device as the original BO. In source-identification mode NPA addresses are importer-specific. Each GPU needs to import the UALink handle by themselves. Sharing the NPA addresses between devices is meaningless and potentially dangerous. Put controls to ensure this is not violated. Signed-off-by: Mukul Joshi Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c index b33c300e26e2e..b4fbd8a407f15 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c @@ -558,6 +558,11 @@ struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev, */ drm_gem_object_get(obj); return obj; + } else { + struct ttm_resource *mem = gem_to_amdgpu_bo(obj)->tbo.resource; + /* NPA DMA-buf can only be imported on the same device. */ + if (mem && mem->mem_type == AMDGPU_PL_NPA) + return ERR_PTR(-EPERM); } } -- 2.55.0