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Thu, 9 Jul 2026 02:56:16 -0700 From: Ashish Mhetre To: Will Deacon , Robin Murphy , "Joerg Roedel (AMD)" CC: , Nicolin Chen , "Ashish Mhetre" , , , Subject: [PATCH v5 1/3] iommu/arm-smmu-v3: Factor out CMDQ batch force-sync conditions Date: Thu, 9 Jul 2026 09:56:07 +0000 Message-ID: <20260709095613.831769-1-amhetre@nvidia.com> X-Mailer: git-send-email 2.50.1 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: SJ5PEPF000001F7:EE_|BL1PR12MB5921:EE_ X-MS-Office365-Filtering-Correlation-Id: 061047fe-4f97-4bde-b470-08dedda05e16 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|23010399003|82310400026|376014|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700016)(23010399003)(82310400026)(376014)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; 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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 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 a10affb483a4..76efe479e80f 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