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Fri, 16 Oct 2026 11:44:07 -0500 Message-ID: <4c9b533f-251a-4569-bc78-fd7af664c831@amd.com> Date: Fri, 16 Oct 2026 11:44:07 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Q] zynqmp-ipi-mailbox and SGI interrupts To: Sebastian Andrzej Siewior , CC: , , Jassi Brar , Michal Simek , Harini T , Saeed Nowshadi References: <20261015083937.8SDbdK8P@linutronix.de> <1ee3f542-e0b2-41d4-bf6a-b103dabf50cd@amd.com> <20261016162356.m2X9jbCa@linutronix.de> Content-Language: en-US From: "Shah, Tanmay" In-Reply-To: <20261016162356.m2X9jbCa@linutronix.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00006003:EE_|DS0PR12MB8443:EE_ X-MS-Office365-Filtering-Correlation-Id: a1ef21bd-5232-42df-e139-08df2ba4b6cb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|82310400026|1800799024|376014|6133799003|22082099003|18002099003|10067099003|11063799006|4143699003|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: pG8l0HiM/3dUMKVuTI7pvEQ2gR6wS2nGQ4fqCNyx7kijnClfuQZzylckkPyKBa0e0LeOK1UcUc/2dpsy1zCGMB4OfwxISzyYRZHU5pLYsi6OmUN/WxkcMTyT6B+PgLBHiRyp5d7hmTKU3uLQXFhugHBbw0PvPDikPxSOQc/LRvui75Q0rDavidKyDTWSZ/vmMj+SZSDzdpP3NrrVvyTsiifn6Nd0a5CfynUqHIQdjUA8QshHgOS0mF2J/bJZq9BW4L7C7/CKBXUBbI+MqaO3wumtHJuyP0uO3Z5NN3FJ1DsBhc31Ss6svgMAP4cD2nH/sdajndXWoTMtjOshsENcqxpp4YVX8n6OBQmglEuyQBE9HTgG+JOa8skL3G6vdkirLvV+U5ypkQhEyOrLDXx1cgMz+g1Vpvhm/OnDQRkRUmS+NPATMFylAeHYbrQ5MDX5 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2026 16:44:15.0895 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a1ef21bd-5232-42df-e139-08df2ba4b6cb 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: BN1PEPF00006003.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8443 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261016_094424_096091_7103EF38 X-CRM114-Status: GOOD ( 16.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: tanmay.shah@amd.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/16/2026 11:23 AM, Sebastian Andrzej Siewior wrote: > On 2026-10-16 11:10:29 [-0500], Shah, Tanmay wrote: >> Hello, > Hello, > >> Thank you for your email, please find my response below: > > Thank you for your email, too. > >>> So is this SGI-IPI a thing or not? >>> >> >> Yes it is. Ideally, TF-A and Linux can share the IPI. If the IPI >> interrupt is used by the TF-A and the expectation is that Linux mailbox >> work on the same IPI (because all other IPIs are busy) then the work >> around is, TF-A will generate SGI for the linux mbox driver, and the >> mbox driver will use that SGI via device-tree. >> >> It is a vendor specific use case. So the dt-node for this use case, may >> not be available in the usptream kernel, but can be enabled if correct >> SGI is configured via the device-tree. > > And it has to be a per-CPU interrupt? It can't become a regular > interrupt which is not per-CPU? Does the driver at some point access > per-CPU registers? > As per my understanding, it has to be a per-CPU interrupt. Driver access those registers via percpu APIs, for example: xlnx_mbox_cpuhp_start() uses enable_percpu_irq(). It is called for each CPU. >> Thank you, >> Tanmay >> > Sebastian