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Sun, 26 Jul 2026 01:19:06 -0700 From: Ashish Mhetre To: , , , , , , , CC: , , , , , Jason Gunthorpe , "Ashish Mhetre" Subject: [PATCH v9 1/4] iommu/arm-smmu-v3: Factor out CMDQ batch force-sync conditions Date: Sun, 26 Jul 2026 08:19:01 +0000 Message-ID: <20260726081904.1408859-2-amhetre@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260726081904.1408859-1-amhetre@nvidia.com> References: <20260726081904.1408859-1-amhetre@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C6193:EE_|DM6PR12MB4267:EE_ X-MS-Office365-Filtering-Correlation-Id: 6cc86788-5703-4e85-d37d-08deeaee94f3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|23010399003|376014|7416014|1800799024|36860700016|10067099003|22082099003|18002099003|56012099006|11063799006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: AxtlEgLK2J0UimXVXsFCkiWIkC6hagWTVXS3NoEsRXAmwPDHHEkMMOQH0eqDMeQuoMtD6Jz+fVu/9CW/fpQmiaqXqNRhVnUaPyIqq3u1oUiD6n0lWMDdNpm5N0dZG19hMIoBXM+ofPPwajH1UzyQz3hUB0PAPJnO2Qo+qkliHbBA5551VdaEiRiOkuN/YipVe4eyvOnOiiZ1wCEUysqeAoEeMwdb52YEb7GLQFrAuDay3XFwySDehbxMdnU73DlSnX/NQ7VA2Vx9wQoxTsiLw8/OCMVpnaeDNuKvqTds3YJisfwkYsu78VniafjrEpJ6isgUTHNj+ZDgHdy7nJR/K9R74nNadmK2ghNVfWk/qQysdgEFAk4GLxBClUPjboD+TWkJktLKRJWW6N3PT53ckJ9l9hl0fr6un9T+F7OSJoSuuHBJd8acV/U3nmAFXsVY X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jul 2026 08:19:15.4651 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6cc86788-5703-4e85-d37d-08deeaee94f3 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000C6193.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4267 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260726_011924_548142_45A0C114 X-CRM114-Status: GOOD ( 12.25 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Nicolin Chen arm_smmu_cmdq_batch_add_cmd_p() carries two distinct reasons for flushing the current batch with a CMD_SYNC before appending the new command: - The batch's pre-assigned cmdq does not support the new command. - The Arm erratum 2812531 workaround (ARM_SMMU_OPT_CMDQ_FORCE_SYNC) forces a SYNC at one entry before the batch is full. Lift those checks into a new arm_smmu_cmdq_batch_force_sync() helper so that adding another force-sync condition becomes a one-line addition. No functional change. Signed-off-by: Nicolin Chen Reviewed-by: Jason Gunthorpe Signed-off-by: Ashish Mhetre --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 23 +++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index f71642428df3..f278c962a7a9 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -847,16 +847,27 @@ static void arm_smmu_cmdq_batch_init_cmd(struct arm_smmu_device *smmu, cmds->cmdq = arm_smmu_get_cmdq(smmu, cmd); } +static bool arm_smmu_cmdq_batch_force_sync(struct arm_smmu_device *smmu, + struct arm_smmu_cmdq_batch *cmds, + struct arm_smmu_cmd *cmd) +{ + /* The batch's pre-assigned cmdq doesn't support the new command */ + if (!arm_smmu_cmdq_supports_cmd(cmds->cmdq, cmd)) + return true; + + /* Arm erratum 2812531 */ + if (cmds->num == CMDQ_BATCH_ENTRIES - 1 && + (smmu->options & ARM_SMMU_OPT_CMDQ_FORCE_SYNC)) + return true; + + return false; +} + static void arm_smmu_cmdq_batch_add_cmd_p(struct arm_smmu_device *smmu, struct arm_smmu_cmdq_batch *cmds, struct arm_smmu_cmd *cmd) { - bool force_sync = (cmds->num == CMDQ_BATCH_ENTRIES - 1) && - (smmu->options & ARM_SMMU_OPT_CMDQ_FORCE_SYNC); - bool unsupported_cmd; - - unsupported_cmd = !arm_smmu_cmdq_supports_cmd(cmds->cmdq, cmd); - if (force_sync || unsupported_cmd) { + if (arm_smmu_cmdq_batch_force_sync(smmu, cmds, cmd)) { arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmdq, cmds->cmds, cmds->num, true); arm_smmu_cmdq_batch_init_cmd(smmu, cmds, cmd); -- 2.50.1