On 2021-04-20 09:27, Shameer Kolothum wrote:
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.thodi@xxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++++++++++++++
1 file changed, 29 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 14e9c7034c04..8bacedf7bb34 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2531,6 +2531,34 @@ 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;
+
+ for (i = 0; i < master->num_sids; i++) {
+ if (e->sid == 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) {
+ if (!arm_smmu_dev_has_rmr(master, rmr))
+ continue;
+
+ iommu_dma_get_rmr_resv_regions(dev, rmr, head);
+ }
+}
+
TBH I wouldn't have thought we need a driver-specific hook for this, or
is it too painful to correlate fwspec->iommu_fwnode back to the relevant
IORT node generically?
Robin.
static void arm_smmu_get_resv_regions(struct device *dev,
struct list_head *head)
{
@@ -2545,6 +2573,7 @@ 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 bool arm_smmu_dev_has_feature(struct device *dev,
