Merge tag 'iommu-fixes-v6.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - Core: Fix an iommu-group refcount leak

 - Fix overflow issue in IOVA alloc path

 - ARM-SMMU fixes from Will:
    - Fix VFIO regression on NXP SoCs by reporting IOMMU_CAP_CACHE_COHERENCY
    - Fix SMMU shutdown paths to avoid device unregistration race

 - Error handling fix for Mediatek IOMMU driver

* tag 'iommu-fixes-v6.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/mediatek-v1: Fix an error handling path in mtk_iommu_v1_probe()
  iommu/iova: Fix alloc iova overflows issue
  iommu: Fix refcount leak in iommu_device_claim_dma_owner
  iommu/arm-smmu-v3: Don't unregister on shutdown
  iommu/arm-smmu: Don't unregister on shutdown
  iommu/arm-smmu: Report IOMMU_CAP_CACHE_COHERENCY even betterer

5 files changed, 35 insertions, 17 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 ab160198edd6..f2425b0f0cd6 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3858,7 +3858,9 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 
 static void arm_smmu_device_shutdown(struct platform_device *pdev)
 {
-	arm_smmu_device_remove(pdev);
+	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
+
+	arm_smmu_device_disable(smmu);
 }
 
 static const struct of_device_id arm_smmu_of_match[] = {
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 719fbca1fe52..2ff7a72cf377 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1316,8 +1316,14 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
 
 	switch (cap) {
 	case IOMMU_CAP_CACHE_COHERENCY:
-		/* Assume that a coherent TCU implies coherent TBUs */
-		return cfg->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK;
+		/*
+		 * It's overwhelmingly the case in practice that when the pagetable
+		 * walk interface is connected to a coherent interconnect, all the
+		 * translation interfaces are too. Furthermore if the device is
+		 * natively coherent, then its translation interface must also be.
+		 */
+		return cfg->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK ||
+			device_get_dma_attr(dev) == DEV_DMA_COHERENT;
 	case IOMMU_CAP_NOEXEC:
 		return true;
 	default:
@@ -2185,19 +2191,16 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int arm_smmu_device_remove(struct platform_device *pdev)
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
 {
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
 	if (!smmu)
-		return -ENODEV;
+		return;
 
 	if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
 		dev_notice(&pdev->dev, "disabling translation\n");
 
-	iommu_device_unregister(&smmu->iommu);
-	iommu_device_sysfs_remove(&smmu->iommu);
-
 	arm_smmu_rpm_get(smmu);
 	/* Turn the thing off */
 	arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sCR0, ARM_SMMU_sCR0_CLIENTPD);
@@ -2209,12 +2212,21 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 		clk_bulk_disable(smmu->num_clks, smmu->clks);
 
 	clk_bulk_unprepare(smmu->num_clks, smmu->clks);
-	return 0;
 }
 
-static void arm_smmu_device_shutdown(struct platform_device *pdev)
+static int arm_smmu_device_remove(struct platform_device *pdev)
 {
-	arm_smmu_device_remove(pdev);
+	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
+
+	if (!smmu)
+		return -ENODEV;
+
+	iommu_device_unregister(&smmu->iommu);
+	iommu_device_sysfs_remove(&smmu->iommu);
+
+	arm_smmu_device_shutdown(pdev);
+
+	return 0;
 }
 
 static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index de91dd88705b..5f6a85aea501 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3185,14 +3185,16 @@ EXPORT_SYMBOL_GPL(iommu_group_claim_dma_owner);
  */
 int iommu_device_claim_dma_owner(struct device *dev, void *owner)
 {
-	struct iommu_group *group = iommu_group_get(dev);
+	struct iommu_group *group;
 	int ret = 0;
 
-	if (!group)
-		return -ENODEV;
 	if (WARN_ON(!owner))
 		return -EINVAL;
 
+	group = iommu_group_get(dev);
+	if (!group)
+		return -ENODEV;
+
 	mutex_lock(&group->mutex);
 	if (group->owner_cnt) {
 		if (group->owner != owner) {
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index a44ad92fc5eb..fe452ce46642 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -197,7 +197,7 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
 
 	curr = __get_cached_rbnode(iovad, limit_pfn);
 	curr_iova = to_iova(curr);
-	retry_pfn = curr_iova->pfn_hi + 1;
+	retry_pfn = curr_iova->pfn_hi;
 
 retry:
 	do {
@@ -211,7 +211,7 @@ retry:
 	if (high_pfn < size || new_pfn < low_pfn) {
 		if (low_pfn == iovad->start_pfn && retry_pfn < limit_pfn) {
 			high_pfn = limit_pfn;
-			low_pfn = retry_pfn;
+			low_pfn = retry_pfn + 1;
 			curr = iova_find_limit(iovad, limit_pfn);
 			curr_iova = to_iova(curr);
 			goto retry;
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 69682ee068d2..ca581ff1c769 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -683,7 +683,7 @@ static int mtk_iommu_v1_probe(struct platform_device *pdev)
 	ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
 				     dev_name(&pdev->dev));
 	if (ret)
-		return ret;
+		goto out_clk_unprepare;
 
 	ret = iommu_device_register(&data->iommu, &mtk_iommu_v1_ops, dev);
 	if (ret)
@@ -698,6 +698,8 @@ out_dev_unreg:
 	iommu_device_unregister(&data->iommu);
 out_sysfs_remove:
 	iommu_device_sysfs_remove(&data->iommu);
+out_clk_unprepare:
+	clk_disable_unprepare(data->bclk);
 	return ret;
 }