drivers/iommu/amd/io_pgtable.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * CPU-agnostic AMD IO page table allocator.
   4  *
   5  * Copyright (C) 2020 Advanced Micro Devices, Inc.
   6  * Author: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
   7  */
   8
   9 #define pr_fmt(fmt)     "AMD-Vi: " fmt
  10 #define dev_fmt(fmt)    pr_fmt(fmt)
  11
  12 #include <linux/atomic.h>
  13 #include <linux/bitops.h>
  14 #include <linux/io-pgtable.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sizes.h>
  17 #include <linux/slab.h>
  18 #include <linux/types.h>
  19 #include <linux/dma-mapping.h>
  20
  21 #include <asm/barrier.h>
  22
  23 #include "amd_iommu_types.h"
  24 #include "amd_iommu.h"
  25
  26 static void v1_tlb_flush_all(void *cookie)
  27 {
  28 }
  29
  30 static void v1_tlb_flush_walk(unsigned long iova, size_t size,
  31                                   size_t granule, void *cookie)
  32 {
  33 }
  34
  35 static void v1_tlb_add_page(struct iommu_iotlb_gather *gather,
  36                                          unsigned long iova, size_t granule,
  37                                          void *cookie)
  38 {
  39 }
  40
  41 static const struct iommu_flush_ops v1_flush_ops = {
  42         .tlb_flush_all  = v1_tlb_flush_all,
  43         .tlb_flush_walk = v1_tlb_flush_walk,
  44         .tlb_add_page   = v1_tlb_add_page,
  45 };
  46
  47 /*
  48  * ----------------------------------------------------
  49  */
  50 static void v1_free_pgtable(struct io_pgtable *iop)
  51 {
  52 }
  53
  54 static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
  55 {
  56         struct amd_io_pgtable *pgtable = io_pgtable_cfg_to_data(cfg);
  57
  58         cfg->pgsize_bitmap  = AMD_IOMMU_PGSIZES,
  59         cfg->ias            = IOMMU_IN_ADDR_BIT_SIZE,
  60         cfg->oas            = IOMMU_OUT_ADDR_BIT_SIZE,
  61         cfg->tlb            = &v1_flush_ops;
  62
  63         return &pgtable->iop;
  64 }
  65
  66 struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns = {
  67         .alloc  = v1_alloc_pgtable,
  68         .free   = v1_free_pgtable,
  69 };