[PATCH 5/5] iommu/tegra-smmu: Add resv_regions ops

[Navneet Kumar <navneetk-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Add support for get/put reserved regions.

Signed-off-by: Navneet Kumar <navneetk-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/tegra-smmu.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 4b43c63..e848a45 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -22,6 +22,9 @@
 #include <soc/tegra/ahb.h>
 #include <soc/tegra/mc.h>
 
+#define MSI_IOVA_BASE	0x8000000
+#define MSI_IOVA_LENGTH	0x100000
+
 struct tegra_smmu_group {
 	struct list_head list;
 	const struct tegra_smmu_group_soc *soc;
@@ -882,6 +885,31 @@ static int tegra_smmu_of_xlate(struct device *dev,
 	return iommu_fwspec_add_ids(dev, &id, 1);
 }
 
+static void tegra_smmu_get_resv_regions(struct device *dev,
+		struct list_head *head)
+{
+	struct iommu_resv_region *region;
+	int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+	region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
+					prot, IOMMU_RESV_SW_MSI);
+	if (!region)
+		return;
+
+	list_add_tail(&region->list, head);
+
+	iommu_dma_get_resv_regions(dev, head);
+}
+
+static void tegra_smmu_put_resv_regions(struct device *dev,
+		struct list_head *head)
+{
+	struct iommu_resv_region *entry, *next;
+
+	list_for_each_entry_safe(entry, next, head, list)
+		kfree(entry);
+}
+
 static const struct iommu_ops tegra_smmu_ops = {
 	.capable = tegra_smmu_capable,
 	.domain_alloc = tegra_smmu_domain_alloc,
@@ -896,6 +924,9 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.iova_to_phys = tegra_smmu_iova_to_phys,
 	.of_xlate = tegra_smmu_of_xlate,
 	.pgsize_bitmap = SZ_4K,
+
+	.get_resv_regions = tegra_smmu_get_resv_regions,
+	.put_resv_regions = tegra_smmu_put_resv_regions,
 };
 
 static void tegra_smmu_ahb_enable(void)
-- 
2.7.4