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Wysocki" , Shameerali Kolothum Thodi , Mostafa Saleh Subject: [PATCH v3 4/9] iommu/arm-smmu-v3: Report IOMMU_CAP_ENFORCE_CACHE_COHERENCY for CANWBS Date: Wed, 9 Oct 2024 13:23:10 -0300 Message-ID: <4-v3-e2e16cd7467f+2a6a1-smmuv3_nesting_jgg@nvidia.com> In-Reply-To: <0-v3-e2e16cd7467f+2a6a1-smmuv3_nesting_jgg@nvidia.com> References: X-ClientProxiedBy: BL1PR13CA0224.namprd13.prod.outlook.com (2603:10b6:208:2bf::19) To CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB8659:EE_|SJ1PR12MB6073:EE_ X-MS-Office365-Filtering-Correlation-Id: 3b5bcaba-4be7-4cac-a8ad-08dce87eae39 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:CH3PR12MB8659.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(366016)(376014)(1800799024)(921020); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: irmSj1wv0w71F+l/lFBXKHLFY/69FiKqeTKm1i+hz4A/mtEd7QCc5DN+cJNm45sutIlvF4bywdCrHTVkggSZAdbYI7Q7YXh7QVjnuDtEsSh6McL2vx57uBO3/7C5fn3lG749IAlnCfLpm/gJTFKOlZ2B2y3DmPjBJrfdbNQ1Rd+PklFLCMMuGIn71tQzd4LIeMzgf18WNe0J7PfVdGvBk4fVDBvGtE6gZuW42eJKZHl7zGbw2HrcLS8mdS0teP3MTTwyz+xAPMpoW35ejE+7XdgDAlr+VwQcG1q0IMIuDoxvrdpQmuf1c3A0stsfqCQ9rk9rWrOL+1XnWtf1cZnQQvRIlN0stMwP5akiDLvof61vC0pPLAwBnOv0qIHK4DhHxWvt++7AKdlQtF8/Nc5ndQDHys9yVxIoyE3k96rbDuFwxGBRJ+gGtv65BO4y+SMozK/PehiHOhUgfDsmz/uwYHTwIhhGT88o+MeChd9Ukx8G9EorpZFGAgq1Z+knq9BAlvzG98BlmwBiuHPQ8TUHgOxgNpFATojnR+ZFlM3jHSAuIZyXDq9b5z8V4D6Xxv4WXHtErHf3U0N2HX1djTx6/1Xmb6RbkD1SBfQLm80fDE+GcvDyu74gPawXJgUpHcN/BTTGClK++OTI8jDU148WdMVBUqhzurvA3TZyxjHutPc4nEpJVpQR7Jd33B1gJQA7pQ+jUPUVX8o4rgI4iv9z8CtiVpsIqm4c72MYQlnsfS3QkodBHvpBwe8v9fTB0RejdeWS8e6QqUcsdHW1iOslZMbOrP4B3tX1vaqqpUw+vr8ZtSsECti37GaTmm4lPZVlIGAVHmBkFD3xo6YxRUgsykOSOin1Klu848XHLKrH/ZFn3yxBSTpcwQUjesNxTf5z5TTD9kFsREV7MjE89tBL12Gy73sonu8qeorn8xZZ5rwBfyZePjkJ41t2Br3T5vQ9ZzEfaIz3aMSLI/uyjUOXrezo4tmVx8edLQupNzbOQPYS+IkmfRxd+CVsADdOQD4F1jhmlZeMDQXXZCzWC8gEDjVR7CWBfBJSjucKmm7Y9260s3nm8lfhXI0EUIoXq4aBo1up4fiv5yo8uSCrLsWP3bsWLU8n9bJKfRcC5/6ps4+sPUJhh5v3si8v8qCSUgecfu64VfxJJeicjOl1cyYvTj4+y1+o2+UjTz53JQKVIwWYIVH93wzAvWOM3yddHyDVtdD0k/RvKxoz0eXJHBR3TglLsCX61tI66wYznbZptQtGSWrOuFLOIOSOBFW5udlNketN8rJXCfxVDXJJpK//qp8t6pY27f6YatqYG0Snmt7wuwX9U7FcRSGdhcWFSraT2eWY6nrJJmOq7IQSr8t3ouTN7JeilzaoV7uQ4iNrSUukgIfc1CTsYqQ4SB421mZyffmqujvkN+ZyScWlOuz6sdGRkmy7kc98eYOGIZ4OgC9UeFBvnhDG/2uAalo6xgpkVTYcCsZzO/YW2ol2rhmKlLzlPz08YRfflf0U7BhIG1Wz99CitPamx4wiBXxC2wxOjvYQIVYL1PChEKBqKwkJV2rmqFy22JqPDR31kmXPepc= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3b5bcaba-4be7-4cac-a8ad-08dce87eae39 X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB8659.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Oct 2024 16:23:16.8492 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WZi9RBK54LUj5/rXkaHwmnHi29o5N0cqg80YXVErXrHS0v9bovmVShySAx5LmxPC X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6073 HW with CANWBS is always cache coherent and ignores PCI No Snoop requests as well. This meets the requirement for IOMMU_CAP_ENFORCE_CACHE_COHERENCY, so let's return it. Implement the enforce_cache_coherency() op to reject attaching devices that don't have CANWBS. Reviewed-by: Nicolin Chen Reviewed-by: Mostafa Saleh Tested-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 31 +++++++++++++++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 7 +++++ 2 files changed, 38 insertions(+) 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 acf250aeb18b27..38725810c14eeb 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2293,6 +2293,8 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap) case IOMMU_CAP_CACHE_COHERENCY: /* Assume that a coherent TCU implies coherent TBUs */ return master->smmu->features & ARM_SMMU_FEAT_COHERENCY; + case IOMMU_CAP_ENFORCE_CACHE_COHERENCY: + return arm_smmu_master_canwbs(master); case IOMMU_CAP_NOEXEC: case IOMMU_CAP_DEFERRED_FLUSH: return true; @@ -2303,6 +2305,26 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap) } } +static bool arm_smmu_enforce_cache_coherency(struct iommu_domain *domain) +{ + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); + struct arm_smmu_master_domain *master_domain; + unsigned long flags; + bool ret = true; + + spin_lock_irqsave(&smmu_domain->devices_lock, flags); + list_for_each_entry(master_domain, &smmu_domain->devices, + devices_elm) { + if (!arm_smmu_master_canwbs(master_domain->master)) { + ret = false; + break; + } + } + smmu_domain->enforce_cache_coherency = ret; + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); + return ret; +} + struct arm_smmu_domain *arm_smmu_domain_alloc(void) { struct arm_smmu_domain *smmu_domain; @@ -2731,6 +2753,14 @@ static int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state, * one of them. */ spin_lock_irqsave(&smmu_domain->devices_lock, flags); + if (smmu_domain->enforce_cache_coherency && + !arm_smmu_master_canwbs(master)) { + spin_unlock_irqrestore(&smmu_domain->devices_lock, + flags); + kfree(master_domain); + return -EINVAL; + } + if (state->ats_enabled) atomic_inc(&smmu_domain->nr_ats_masters); list_add(&master_domain->devices_elm, &smmu_domain->devices); @@ -3493,6 +3523,7 @@ static struct iommu_ops arm_smmu_ops = { .owner = THIS_MODULE, .default_domain_ops = &(const struct iommu_domain_ops) { .attach_dev = arm_smmu_attach_dev, + .enforce_cache_coherency = arm_smmu_enforce_cache_coherency, .set_dev_pasid = arm_smmu_s1_set_dev_pasid, .map_pages = arm_smmu_map_pages, .unmap_pages = arm_smmu_unmap_pages, diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 1e9952ca989f87..06e3d88932df12 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -811,6 +811,7 @@ struct arm_smmu_domain { /* List of struct arm_smmu_master_domain */ struct list_head devices; spinlock_t devices_lock; + bool enforce_cache_coherency : 1; struct mmu_notifier mmu_notifier; }; @@ -893,6 +894,12 @@ int arm_smmu_init_one_queue(struct arm_smmu_device *smmu, int arm_smmu_cmdq_init(struct arm_smmu_device *smmu, struct arm_smmu_cmdq *cmdq); +static inline bool arm_smmu_master_canwbs(struct arm_smmu_master *master) +{ + return dev_iommu_fwspec_get(master->dev)->flags & + IOMMU_FWSPEC_PCI_RC_CANWBS; +} + #ifdef CONFIG_ARM_SMMU_V3_SVA bool arm_smmu_sva_supported(struct arm_smmu_device *smmu); bool arm_smmu_master_sva_supported(struct arm_smmu_master *master);