1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright 2023 Solidigm All Rights Reserved 3 */ 4 5 #include "ftl_nvc_dev.h" 6 #include "ftl_core.h" 7 #include "ftl_layout.h" 8 #include "utils/ftl_layout_tracker_bdev.h" 9 10 static bool 11 is_bdev_compatible(struct spdk_ftl_dev *dev, struct spdk_bdev *bdev) 12 { 13 if (!spdk_bdev_is_md_separate(bdev)) { 14 /* It doesn't support separate metadata buffer IO */ 15 return false; 16 } 17 18 if (spdk_bdev_get_md_size(bdev) != sizeof(union ftl_md_vss)) { 19 /* Bdev's metadata is invalid size */ 20 return false; 21 } 22 23 if (spdk_bdev_get_dif_type(bdev) != SPDK_DIF_DISABLE) { 24 /* Unsupported DIF type used by bdev */ 25 return false; 26 } 27 28 if (ftl_md_xfer_blocks(dev) * spdk_bdev_get_md_size(bdev) > FTL_ZERO_BUFFER_SIZE) { 29 FTL_ERRLOG(dev, "Zero buffer too small for bdev %s metadata transfer\n", 30 spdk_bdev_get_name(bdev)); 31 return false; 32 } 33 34 return true; 35 } 36 37 static bool 38 is_chunk_active(struct spdk_ftl_dev *dev, uint64_t chunk_offset) 39 { 40 const struct ftl_layout_tracker_bdev_region_props *reg_free = ftl_layout_tracker_bdev_insert_region( 41 dev->nvc_layout_tracker, FTL_LAYOUT_REGION_TYPE_INVALID, 0, chunk_offset, 42 dev->layout.nvc.chunk_data_blocks); 43 44 assert(!reg_free || reg_free->type == FTL_LAYOUT_REGION_TYPE_FREE); 45 return reg_free != NULL; 46 } 47 48 static void 49 md_region_setup(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, 50 struct ftl_layout_region *region) 51 { 52 assert(region); 53 region->type = reg_type; 54 region->mirror_type = FTL_LAYOUT_REGION_TYPE_INVALID; 55 region->name = ftl_md_region_name(reg_type); 56 57 region->bdev_desc = dev->nv_cache.bdev_desc; 58 region->ioch = dev->nv_cache.cache_ioch; 59 region->vss_blksz = dev->nv_cache.md_size; 60 } 61 62 static int 63 md_region_create(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, 64 uint32_t reg_version, size_t reg_blks) 65 { 66 const struct ftl_layout_tracker_bdev_region_props *reg_props; 67 68 assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX); 69 reg_blks = ftl_md_region_align_blocks(dev, reg_blks); 70 71 reg_props = ftl_layout_tracker_bdev_add_region(dev->nvc_layout_tracker, reg_type, reg_version, 72 reg_blks, 0); 73 if (!reg_props) { 74 return -1; 75 } 76 assert(reg_props->type == reg_type); 77 assert(reg_props->ver == reg_version); 78 assert(reg_props->blk_sz == reg_blks); 79 assert(reg_props->blk_offs + reg_blks <= dev->layout.nvc.total_blocks); 80 return 0; 81 } 82 83 static int 84 md_region_open(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, uint32_t reg_version, 85 size_t entry_size, size_t entry_count, struct ftl_layout_region *region) 86 { 87 const struct ftl_layout_tracker_bdev_region_props *reg_search_ctx = NULL; 88 uint64_t reg_blks = ftl_md_region_blocks(dev, entry_size * entry_count); 89 90 assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX); 91 92 while (true) { 93 ftl_layout_tracker_bdev_find_next_region(dev->nvc_layout_tracker, reg_type, ®_search_ctx); 94 if (!reg_search_ctx || reg_search_ctx->ver == reg_version) { 95 break; 96 } 97 } 98 99 if (!reg_search_ctx || reg_search_ctx->blk_sz < reg_blks) { 100 /* Region not found or insufficient space */ 101 return -1; 102 } 103 104 if (!region) { 105 return 0; 106 } 107 108 md_region_setup(dev, reg_type, region); 109 110 region->entry_size = entry_size / FTL_BLOCK_SIZE; 111 region->num_entries = entry_count; 112 113 region->current.version = reg_version; 114 region->current.offset = reg_search_ctx->blk_offs; 115 region->current.blocks = reg_search_ctx->blk_sz; 116 117 return 0; 118 } 119 120 struct ftl_nv_cache_device_type nvc_bdev_vss = { 121 .name = "bdev", 122 .features = { 123 }, 124 .ops = { 125 .is_bdev_compatible = is_bdev_compatible, 126 .is_chunk_active = is_chunk_active, 127 .md_layout_ops = { 128 .region_create = md_region_create, 129 .region_open = md_region_open, 130 }, 131 } 132 }; 133 FTL_NV_CACHE_DEVICE_TYPE_REGISTER(nvc_bdev_vss) 134