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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Kevin Tian <kevin.tian@intel.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Nicolin Chen <nicolinc@nvidia.com>
Cc: Yi Liu <yi.l.liu@intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Longfang Liu <liulongfang@huawei.com>,
	Yan Zhao <yan.y.zhao@intel.com>,
	iommu@lists.linux.dev, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>,
	Jason Gunthorpe <jgg@nvidia.com>
Subject: [PATCH v8 02/12] iommu/arm-smmu-v3: Remove unrecoverable faults reporting
Date: Thu,  7 Dec 2023 14:42:58 +0800	[thread overview]
Message-ID: <20231207064308.313316-3-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20231207064308.313316-1-baolu.lu@linux.intel.com>

No device driver registers fault handler to handle the reported
unrecoveraable faults. Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Longfang Liu <liulongfang@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 46 ++++++---------------
 1 file changed, 13 insertions(+), 33 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 fc4317c25b6d..0f33b212ca28 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1463,7 +1463,6 @@ arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid)
 static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 {
 	int ret;
-	u32 reason;
 	u32 perm = 0;
 	struct arm_smmu_master *master;
 	bool ssid_valid = evt[0] & EVTQ_0_SSV;
@@ -1473,16 +1472,9 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 
 	switch (FIELD_GET(EVTQ_0_ID, evt[0])) {
 	case EVT_ID_TRANSLATION_FAULT:
-		reason = IOMMU_FAULT_REASON_PTE_FETCH;
-		break;
 	case EVT_ID_ADDR_SIZE_FAULT:
-		reason = IOMMU_FAULT_REASON_OOR_ADDRESS;
-		break;
 	case EVT_ID_ACCESS_FAULT:
-		reason = IOMMU_FAULT_REASON_ACCESS;
-		break;
 	case EVT_ID_PERMISSION_FAULT:
-		reason = IOMMU_FAULT_REASON_PERMISSION;
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -1492,6 +1484,9 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 	if (evt[1] & EVTQ_1_S2)
 		return -EFAULT;
 
+	if (!(evt[1] & EVTQ_1_STALL))
+		return -EOPNOTSUPP;
+
 	if (evt[1] & EVTQ_1_RnW)
 		perm |= IOMMU_FAULT_PERM_READ;
 	else
@@ -1503,32 +1498,17 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 	if (evt[1] & EVTQ_1_PnU)
 		perm |= IOMMU_FAULT_PERM_PRIV;
 
-	if (evt[1] & EVTQ_1_STALL) {
-		flt->type = IOMMU_FAULT_PAGE_REQ;
-		flt->prm = (struct iommu_fault_page_request) {
-			.flags = IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE,
-			.grpid = FIELD_GET(EVTQ_1_STAG, evt[1]),
-			.perm = perm,
-			.addr = FIELD_GET(EVTQ_2_ADDR, evt[2]),
-		};
+	flt->type = IOMMU_FAULT_PAGE_REQ;
+	flt->prm = (struct iommu_fault_page_request) {
+		.flags = IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE,
+		.grpid = FIELD_GET(EVTQ_1_STAG, evt[1]),
+		.perm = perm,
+		.addr = FIELD_GET(EVTQ_2_ADDR, evt[2]),
+	};
 
-		if (ssid_valid) {
-			flt->prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID;
-			flt->prm.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]);
-		}
-	} else {
-		flt->type = IOMMU_FAULT_DMA_UNRECOV;
-		flt->event = (struct iommu_fault_unrecoverable) {
-			.reason = reason,
-			.flags = IOMMU_FAULT_UNRECOV_ADDR_VALID,
-			.perm = perm,
-			.addr = FIELD_GET(EVTQ_2_ADDR, evt[2]),
-		};
-
-		if (ssid_valid) {
-			flt->event.flags |= IOMMU_FAULT_UNRECOV_PASID_VALID;
-			flt->event.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]);
-		}
+	if (ssid_valid) {
+		flt->prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID;
+		flt->prm.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]);
 	}
 
 	mutex_lock(&smmu->streams_mutex);
-- 
2.34.1


  parent reply	other threads:[~2023-12-07  6:48 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-07  6:42 [PATCH v8 00/12] iommu: Prepare to deliver page faults to user space Lu Baolu
2023-12-07  6:42 ` [PATCH v8 01/12] iommu: Move iommu fault data to linux/iommu.h Lu Baolu
2023-12-07  6:42 ` Lu Baolu [this message]
2023-12-07  6:42 ` [PATCH v8 03/12] iommu: Remove unrecoverable fault data Lu Baolu
2023-12-07  6:43 ` [PATCH v8 04/12] iommu: Cleanup iopf data structure definitions Lu Baolu
2023-12-07  6:43 ` [PATCH v8 05/12] iommu: Merge iopf_device_param into iommu_fault_param Lu Baolu
2023-12-07  6:43 ` [PATCH v8 06/12] iommu: Remove iommu_[un]register_device_fault_handler() Lu Baolu
2023-12-07  6:43 ` [PATCH v8 07/12] iommu: Merge iommu_fault_event and iopf_fault Lu Baolu
2023-12-07  6:43 ` [PATCH v8 08/12] iommu: Prepare for separating SVA and IOPF Lu Baolu
2023-12-07  6:43 ` [PATCH v8 09/12] iommu: Make iommu_queue_iopf() more generic Lu Baolu
2023-12-07  6:43 ` [PATCH v8 10/12] iommu: Separate SVA and IOPF Lu Baolu
2023-12-07  6:43 ` [PATCH v8 11/12] iommu: Refine locking for per-device fault data management Lu Baolu
2023-12-11 14:50   ` Jason Gunthorpe
2023-12-07  6:43 ` [PATCH v8 12/12] iommu: Use refcount for fault data access Lu Baolu
2023-12-11 15:12   ` Jason Gunthorpe
2023-12-12  3:44     ` Baolu Lu
2023-12-12 15:18       ` Jason Gunthorpe
2023-12-11 15:24   ` Jason Gunthorpe
2023-12-12  5:07     ` Baolu Lu
2023-12-12 15:18       ` Jason Gunthorpe
2023-12-13  2:19         ` Baolu Lu
2023-12-12  5:17     ` Baolu Lu
2023-12-12 15:14       ` Jason Gunthorpe
2023-12-13  2:14         ` Baolu Lu
2023-12-12  5:23     ` Baolu Lu

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