iommu/amd: Remove the confusing dummy iommu_flush_ops tlb ops

The iommu driver is supposed to provide these ops to its io_pgtable
implementation so that it can hook the invalidations and do the right
thing.

They are called by wrapper functions like io_pgtable_tlb_add_page() etc,
which the AMD code never calls.

Instead it directly calls the AMD IOMMU invalidation functions by casting
to the struct protection_domain. Remove it all.

Reviewed-by: Vasant Hegde <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: jgunthorpe

drivers/iommu/amd/io_pgtable.c

@@ -24,27 +24,6 @@
 #include "amd_iommu.h"
 #include "../iommu-pages.h"
 
-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_add_page(struct iommu_iotlb_gather *gather,
-					 unsigned long iova, size_t granule,
-					 void *cookie)
-{
-}
-
-static const struct iommu_flush_ops v1_flush_ops = {
-	.tlb_flush_all	= v1_tlb_flush_all,
-	.tlb_flush_walk = v1_tlb_flush_walk,
-	.tlb_add_page	= v1_tlb_add_page,
-};
-
 /*
  * Helper function to get the first pte of a large mapping
  */
@@ -572,7 +551,6 @@ static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo
 	cfg->pgsize_bitmap  = AMD_IOMMU_PGSIZES;
 	cfg->ias            = IOMMU_IN_ADDR_BIT_SIZE;
 	cfg->oas            = IOMMU_OUT_ADDR_BIT_SIZE;
-	cfg->tlb            = &v1_flush_ops;
 
 	pgtable->pgtbl.ops.map_pages    = iommu_v1_map_pages;
 	pgtable->pgtbl.ops.unmap_pages  = iommu_v1_unmap_pages;

drivers/iommu/amd/io_pgtable_v2.c

@@ -326,27 +326,6 @@ static phys_addr_t iommu_v2_iova_to_phys(struct io_pgtable_ops *ops, unsigned lo
 /*
  * ----------------------------------------------------
  */
-static void v2_tlb_flush_all(void *cookie)
-{
-}
-
-static void v2_tlb_flush_walk(unsigned long iova, size_t size,
-			      size_t granule, void *cookie)
-{
-}
-
-static void v2_tlb_add_page(struct iommu_iotlb_gather *gather,
-			    unsigned long iova, size_t granule,
-			    void *cookie)
-{
-}
-
-static const struct iommu_flush_ops v2_flush_ops = {
-	.tlb_flush_all	= v2_tlb_flush_all,
-	.tlb_flush_walk = v2_tlb_flush_walk,
-	.tlb_add_page	= v2_tlb_add_page,
-};
-
 static void v2_free_pgtable(struct io_pgtable *iop)
 {
 	struct amd_io_pgtable *pgtable = container_of(iop, struct amd_io_pgtable, pgtbl);
@@ -378,7 +357,6 @@ static struct io_pgtable *v2_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo
 	cfg->pgsize_bitmap = AMD_IOMMU_PGSIZES_V2;
 	cfg->ias           = ias;
 	cfg->oas           = IOMMU_OUT_ADDR_BIT_SIZE;
-	cfg->tlb           = &v2_flush_ops;
 
 	return &pgtable->pgtbl;
 }