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 void 38 md_region_setup(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, 39 struct ftl_layout_region *region) 40 { 41 assert(region); 42 region->type = reg_type; 43 region->mirror_type = FTL_LAYOUT_REGION_TYPE_INVALID; 44 region->name = ftl_md_region_name(reg_type); 45 46 region->bdev_desc = dev->nv_cache.bdev_desc; 47 region->ioch = dev->nv_cache.cache_ioch; 48 region->vss_blksz = dev->nv_cache.md_size; 49 } 50 51 static int 52 md_region_create(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, 53 uint32_t reg_version, size_t reg_blks) 54 { 55 const struct ftl_layout_tracker_bdev_region_props *reg_props; 56 57 assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX); 58 reg_blks = ftl_md_region_align_blocks(dev, reg_blks); 59 60 reg_props = ftl_layout_tracker_bdev_add_region(dev->nvc_layout_tracker, reg_type, reg_version, 61 reg_blks, 0); 62 if (!reg_props) { 63 return -1; 64 } 65 assert(reg_props->type == reg_type); 66 assert(reg_props->ver == reg_version); 67 assert(reg_props->blk_sz == reg_blks); 68 assert(reg_props->blk_offs + reg_blks <= dev->layout.nvc.total_blocks); 69 return 0; 70 } 71 72 static int 73 md_region_open(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, uint32_t reg_version, 74 size_t entry_size, size_t entry_count, struct ftl_layout_region *region) 75 { 76 const struct ftl_layout_tracker_bdev_region_props *reg_search_ctx = NULL; 77 uint64_t reg_blks = ftl_md_region_blocks(dev, entry_size * entry_count); 78 79 assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX); 80 81 while (true) { 82 ftl_layout_tracker_bdev_find_next_region(dev->nvc_layout_tracker, reg_type, ®_search_ctx); 83 if (!reg_search_ctx || reg_search_ctx->ver == reg_version) { 84 break; 85 } 86 } 87 88 if (!reg_search_ctx || reg_search_ctx->blk_sz < reg_blks) { 89 /* Region not found or insufficient space */ 90 return -1; 91 } 92 93 if (!region) { 94 return 0; 95 } 96 97 md_region_setup(dev, reg_type, region); 98 99 region->entry_size = entry_size / FTL_BLOCK_SIZE; 100 region->num_entries = entry_count; 101 102 region->current.version = reg_version; 103 region->current.offset = reg_search_ctx->blk_offs; 104 region->current.blocks = reg_search_ctx->blk_sz; 105 106 return 0; 107 } 108 109 struct ftl_nv_cache_device_desc nvc_bdev_vss = { 110 .name = "bdev", 111 .features = { 112 }, 113 .ops = { 114 .is_bdev_compatible = is_bdev_compatible, 115 116 .md_layout_ops = { 117 .region_create = md_region_create, 118 .region_open = md_region_open, 119 }, 120 } 121 }; 122 FTL_NV_CACHE_DEVICE_TYPE_REGISTER(nvc_bdev_vss) 123