[RFC PATCH v2 8/8] iommu/arm-smmu-v3: Reserve any RMR regions associated with a dev

[Shameer Kolothum]

Get RMR regions associated with a dev reserved so that there is
a unity mapping for them in SMMU.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.th...@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 38 +++++++++++++++++++++
 1 file 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 97df1df001c9..174a9bcfd627 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2492,6 +2492,43 @@ static int arm_smmu_of_xlate(struct device *dev, struct 
of_phandle_args *args)
        return iommu_fwspec_add_ids(dev, args->args, 1);
 }
 
+static bool arm_smmu_dev_has_rmr(struct arm_smmu_master *master,
+                                struct iommu_rmr *e)
+{
+       int i, j;
+
+       for (i = 0; i < master->num_sids; i++) {
+               for (j = 0; j < e->num_ids; j++) {
+                       if (e->ids[j] == master->sids[i])
+                               return true;
+               }
+       }
+
+       return false;
+}
+
+static void arm_smmu_rmr_get_resv_regions(struct device *dev,
+                                         struct list_head *head)
+{
+       struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+       struct arm_smmu_device *smmu = master->smmu;
+       struct iommu_rmr *rmr;
+
+       list_for_each_entry(rmr, &smmu->rmr_list, list) {
+               struct iommu_resv_region *region;
+               int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+               if (!arm_smmu_dev_has_rmr(master, rmr))
+                       continue;
+               region = iommu_alloc_resv_region(rmr->base_address,
+                                                rmr->length, prot,
+                                                IOMMU_RESV_DIRECT);
+               if (!region)
+                       return;
+
+               list_add_tail(&region->list, head);
+       }
+}
 static void arm_smmu_get_resv_regions(struct device *dev,
                                      struct list_head *head)
 {
@@ -2506,6 +2543,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
        list_add_tail(&region->list, head);
 
        iommu_dma_get_resv_regions(dev, head);
+       arm_smmu_rmr_get_resv_regions(dev, head);
 }
 
 static bool arm_smmu_dev_has_feature(struct device *dev,
-- 
2.17.1

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