linux-kernel - [PATCH v3 13/14] iommu/amd: Introduce IOMMU flush callbacks

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Date:   Sun,  4 Oct 2020 01:45:48 +0000
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, robin.murphy@....com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v3 13/14] iommu/amd: Introduce IOMMU flush callbacks

Add TLB flush callback functions, which are used by the IO
page table framework.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/io_pgtable.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index d8b329aa0bb2..3c2faa47ea5d 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -514,6 +514,33 @@ static phys_addr_t iommu_v1_iova_to_phys(struct io_pgtable_ops *ops, unsigned lo
 /*
  * ----------------------------------------------------
  */
+static void v1_tlb_flush_all(void *cookie)
+{
+}
+
+static void v1_tlb_flush_walk(unsigned long iova, size_t size,
+				  size_t granule, void *cookie)
+{
+}
+
+static void v1_tlb_flush_leaf(unsigned long iova, size_t size,
+				  size_t granule, void *cookie)
+{
+}
+
+static void v1_tlb_add_page(struct iommu_iotlb_gather *gather,
+					 unsigned long iova, size_t granule,
+					 void *cookie)
+{
+}
+
+const struct iommu_flush_ops v1_flush_ops = {
+	.tlb_flush_all	= v1_tlb_flush_all,
+	.tlb_flush_walk = v1_tlb_flush_walk,
+	.tlb_flush_leaf = v1_tlb_flush_leaf,
+	.tlb_add_page	= v1_tlb_add_page,
+};
+
 static void v1_free_pgtable(struct io_pgtable *iop)
 {
 }
@@ -526,6 +553,8 @@ static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo
 	pgtable->iop.ops.unmap        = iommu_v1_unmap_page;
 	pgtable->iop.ops.iova_to_phys = iommu_v1_iova_to_phys;
 
+	cfg->tlb = &v1_flush_ops;
+
 	return &pgtable->iop;
 }
 
-- 
2.17.1