[RFC v2 2/4] iommu/arm-smmu-v3: Add tlbi_on_map option

[Eric Auger <eric.auger@redhat.com>]

When running a virtual SMMU on a guest we sometimes need to trap
all changes to the translation structures. This is especially useful
to integrate with VFIO. This patch adds a new option that forces
the IO_PGTABLE_QUIRK_TLBI_ON_MAP to be applied on LPAE page tables.

TLBI commands then can be trapped.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v1 -> v2:
- rebase on v4.13-rc2
---
 Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 4 ++++
 drivers/iommu/arm-smmu-v3.c                             | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index c9abbf3..ebb85e9 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -52,6 +52,10 @@ the PCIe specification.
                         devicetree/bindings/interrupt-controller/msi.txt
                       for a description of the msi-parent property.
 
+- tlbi-on-map       : invalidate caches whenever there is an update of
+                      any remapping structure (updates to not-present or
+                      present entries).
+
 - hisilicon,broken-prefetch-cmd
                     : Avoid sending CMD_PREFETCH_* commands to the SMMU.
 
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 568c400..690247b 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -608,6 +608,7 @@ struct arm_smmu_device {
 
 #define ARM_SMMU_OPT_SKIP_PREFETCH	(1 << 0)
 #define ARM_SMMU_OPT_PAGE0_REGS_ONLY	(1 << 1)
+#define ARM_SMMU_OPT_TLBI_ON_MAP	(1 << 2)
 	u32				options;
 
 	struct arm_smmu_cmdq		cmdq;
@@ -675,6 +676,7 @@ struct arm_smmu_option_prop {
 static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
 	{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium,cn9900-broken-page1-regspace"},
+	{ ARM_SMMU_OPT_TLBI_ON_MAP, "tlbi-on-map" },
 	{ 0, NULL},
 };
 
@@ -1604,6 +1606,9 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
 	if (smmu->features & ARM_SMMU_FEAT_COHERENCY)
 		pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA;
 
+	if (smmu->options & ARM_SMMU_OPT_TLBI_ON_MAP)
+		pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_TLBI_ON_MAP;
+
 	pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
 	if (!pgtbl_ops)
 		return -ENOMEM;
-- 
2.5.5