[v4,6/8] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE

Message ID 20210513134550.2117-7-shameerali.kolothum.thodi@huawei.com
State Superseded
Headers show
Series
  • ACPI/IORT: Support for IORT RMR node
Related show

Commit Message

Shameerali Kolothum Thodi May 13, 2021, 1:45 p.m.
Check if there is any RMR info associated with the devices behind
the SMMUv3 and if any, install bypass STEs for them. This is to
keep any ongoing traffic associated with these devices alive
when we enable/reset SMMUv3 during probe().

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>

---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++++++++++
 1 file changed, 33 insertions(+)

-- 
2.17.1

Patch

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 f9195b740f48..c2d2e65b9856 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3574,6 +3574,36 @@  static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t start,
 	return devm_ioremap_resource(dev, &res);
 }
 
+static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu)
+{
+	struct list_head rmr_list;
+	struct iommu_rmr *e;
+	int ret;
+
+	INIT_LIST_HEAD(&rmr_list);
+	if (iommu_dma_get_rmrs(dev_fwnode(smmu->dev), &rmr_list))
+		return;
+
+	/*
+	 * Since, we don't have a mechanism to differentiate the RMR
+	 * SIDs that has an ongoing live stream, install bypass STEs
+	 * for all the reported ones. 
+	 */
+	list_for_each_entry(e, &rmr_list, list) {
+		__le64 *step;
+
+		ret = arm_smmu_init_sid_strtab(smmu, e->sid);
+		if (ret) {
+			dev_err(smmu->dev, "RMR bypass(0x%x) failed\n",
+				e->sid);
+			continue;
+		}
+
+		step = arm_smmu_get_step_for_sid(smmu, e->sid);
+		arm_smmu_write_strtab_ent(NULL, e->sid, step, true);
+	}
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	int irq, ret;
@@ -3657,6 +3687,9 @@  static int arm_smmu_device_probe(struct platform_device *pdev)
 	/* Record our private device structure */
 	platform_set_drvdata(pdev, smmu);
 
+	/* Check for RMRs and install bypass STEs if any */
+	arm_smmu_rmr_install_bypass_ste(smmu);
+
 	/* Reset the device */
 	ret = arm_smmu_device_reset(smmu, bypass);
 	if (ret)