[PATCH v3 10/10] iommu/arm-smmu: Reserve any RMR regions associated with a dev
Shameer Kolothum
shameerali.kolothum.thodi at huawei.com
Tue Apr 20 09:27:51 BST 2021
From: Jon Nettleton <jon at solid-run.com>
Get RMR regions associated with a dev reserved so that there is
a unity mapping for them in SMMU.
Signed-off-by: Jon Nettleton <jon at solid-run.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
---
drivers/iommu/arm/arm-smmu/arm-smmu.c | 33 +++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 4d2f91626d87..8cbe8b98e8f0 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1591,6 +1591,38 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
return iommu_fwspec_add_ids(dev, &fwid, 1);
}
+static bool arm_smmu_dev_has_rmr(struct arm_smmu_master_cfg *cfg,
+ struct iommu_fwspec *fwspec,
+ struct iommu_rmr *e)
+{
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct arm_smmu_smr *smrs = smmu->smrs;
+ int i, idx;
+
+ for_each_cfg_sme(cfg, fwspec, i, idx) {
+ if (e->sid == smrs[idx].id)
+ return true;
+ }
+
+ return false;
+}
+
+static void arm_smmu_rmr_get_resv_regions(struct device *dev,
+ struct list_head *head)
+{
+ struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct iommu_rmr *rmr;
+
+ list_for_each_entry(rmr, &smmu->rmr_list, list) {
+ if (!arm_smmu_dev_has_rmr(cfg, fwspec, rmr))
+ continue;
+
+ iommu_dma_get_rmr_resv_regions(dev, rmr, head);
+ }
+}
+
static void arm_smmu_get_resv_regions(struct device *dev,
struct list_head *head)
{
@@ -1605,6 +1637,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
list_add_tail(®ion->list, head);
iommu_dma_get_resv_regions(dev, head);
+ arm_smmu_rmr_get_resv_regions(dev, head);
}
static int arm_smmu_def_domain_type(struct device *dev)
--
2.17.1
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