11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2c66ac9dbSNicholas Bellinger /******************************************************************************* 3c66ac9dbSNicholas Bellinger * Filename: target_core_iblock.c 4c66ac9dbSNicholas Bellinger * 5c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> Linux BlockIO transport 6c66ac9dbSNicholas Bellinger * specific functions. 7c66ac9dbSNicholas Bellinger * 84c76251eSNicholas Bellinger * (c) Copyright 2003-2013 Datera, Inc. 9c66ac9dbSNicholas Bellinger * 10c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 11c66ac9dbSNicholas Bellinger * 12c66ac9dbSNicholas Bellinger ******************************************************************************/ 13c66ac9dbSNicholas Bellinger 14c66ac9dbSNicholas Bellinger #include <linux/string.h> 15c66ac9dbSNicholas Bellinger #include <linux/parser.h> 16c66ac9dbSNicholas Bellinger #include <linux/timer.h> 17c66ac9dbSNicholas Bellinger #include <linux/fs.h> 18c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 19c66ac9dbSNicholas Bellinger #include <linux/slab.h> 20c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 21c66ac9dbSNicholas Bellinger #include <linux/bio.h> 22c66ac9dbSNicholas Bellinger #include <linux/genhd.h> 23c66ac9dbSNicholas Bellinger #include <linux/file.h> 24827509e3SPaul Gortmaker #include <linux/module.h> 25ba929992SBart Van Assche #include <scsi/scsi_proto.h> 2614150a6bSChristoph Hellwig #include <asm/unaligned.h> 27c66ac9dbSNicholas Bellinger 28c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 29c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 30c66ac9dbSNicholas Bellinger 31c66ac9dbSNicholas Bellinger #include "target_core_iblock.h" 32c66ac9dbSNicholas Bellinger 33d5b4a21bSChristoph Hellwig #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ 34d5b4a21bSChristoph Hellwig #define IBLOCK_BIO_POOL_SIZE 128 35d5b4a21bSChristoph Hellwig 360fd97ccfSChristoph Hellwig static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) 370fd97ccfSChristoph Hellwig { 380fd97ccfSChristoph Hellwig return container_of(dev, struct iblock_dev, dev); 390fd97ccfSChristoph Hellwig } 400fd97ccfSChristoph Hellwig 410fd97ccfSChristoph Hellwig 42c66ac9dbSNicholas Bellinger static int iblock_attach_hba(struct se_hba *hba, u32 host_id) 43c66ac9dbSNicholas Bellinger { 446708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" 45c66ac9dbSNicholas Bellinger " Generic Target Core Stack %s\n", hba->hba_id, 46ce8dd25dSChristoph Hellwig IBLOCK_VERSION, TARGET_CORE_VERSION); 47c66ac9dbSNicholas Bellinger return 0; 48c66ac9dbSNicholas Bellinger } 49c66ac9dbSNicholas Bellinger 50c66ac9dbSNicholas Bellinger static void iblock_detach_hba(struct se_hba *hba) 51c66ac9dbSNicholas Bellinger { 52c66ac9dbSNicholas Bellinger } 53c66ac9dbSNicholas Bellinger 540fd97ccfSChristoph Hellwig static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) 55c66ac9dbSNicholas Bellinger { 56c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = NULL; 57c66ac9dbSNicholas Bellinger 58c66ac9dbSNicholas Bellinger ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); 596708bb27SAndy Grover if (!ib_dev) { 606708bb27SAndy Grover pr_err("Unable to allocate struct iblock_dev\n"); 61c66ac9dbSNicholas Bellinger return NULL; 62c66ac9dbSNicholas Bellinger } 63c66ac9dbSNicholas Bellinger 64415ccd98SMike Christie ib_dev->ibd_plug = kcalloc(nr_cpu_ids, sizeof(*ib_dev->ibd_plug), 65415ccd98SMike Christie GFP_KERNEL); 66415ccd98SMike Christie if (!ib_dev->ibd_plug) 67415ccd98SMike Christie goto free_dev; 68415ccd98SMike Christie 696708bb27SAndy Grover pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); 70c66ac9dbSNicholas Bellinger 710fd97ccfSChristoph Hellwig return &ib_dev->dev; 72415ccd98SMike Christie 73415ccd98SMike Christie free_dev: 74415ccd98SMike Christie kfree(ib_dev); 75415ccd98SMike Christie return NULL; 76c66ac9dbSNicholas Bellinger } 77c66ac9dbSNicholas Bellinger 780fd97ccfSChristoph Hellwig static int iblock_configure_device(struct se_device *dev) 79c66ac9dbSNicholas Bellinger { 800fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 81c66ac9dbSNicholas Bellinger struct request_queue *q; 820fd97ccfSChristoph Hellwig struct block_device *bd = NULL; 83ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 8444bfd018SAndy Grover fmode_t mode; 852237498fSNicholas Bellinger unsigned int max_write_zeroes_sectors; 868f13142aSColin Ian King int ret; 87c66ac9dbSNicholas Bellinger 880fd97ccfSChristoph Hellwig if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { 890fd97ccfSChristoph Hellwig pr_err("Missing udev_path= parameters for IBLOCK\n"); 900fd97ccfSChristoph Hellwig return -EINVAL; 91c66ac9dbSNicholas Bellinger } 92d5b4a21bSChristoph Hellwig 93a47a28b7SKent Overstreet ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 94a47a28b7SKent Overstreet if (ret) { 950fd97ccfSChristoph Hellwig pr_err("IBLOCK: Unable to create bioset\n"); 960fd97ccfSChristoph Hellwig goto out; 97c66ac9dbSNicholas Bellinger } 980fd97ccfSChristoph Hellwig 996708bb27SAndy Grover pr_debug( "IBLOCK: Claiming struct block_device: %s\n", 100c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 101c66ac9dbSNicholas Bellinger 10244bfd018SAndy Grover mode = FMODE_READ|FMODE_EXCL; 10344bfd018SAndy Grover if (!ib_dev->ibd_readonly) 10444bfd018SAndy Grover mode |= FMODE_WRITE; 105eeeb9522SNicholas Bellinger else 106eeeb9522SNicholas Bellinger dev->dev_flags |= DF_READ_ONLY; 10744bfd018SAndy Grover 10844bfd018SAndy Grover bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); 109613640e4SNicholas Bellinger if (IS_ERR(bd)) { 110613640e4SNicholas Bellinger ret = PTR_ERR(bd); 1110fd97ccfSChristoph Hellwig goto out_free_bioset; 112613640e4SNicholas Bellinger } 113c66ac9dbSNicholas Bellinger ib_dev->ibd_bd = bd; 114c66ac9dbSNicholas Bellinger 1150fd97ccfSChristoph Hellwig q = bdev_get_queue(bd); 1160fd97ccfSChristoph Hellwig 1170fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); 118046ba642SNicholas Bellinger dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); 1190fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = q->nr_requests; 120c66ac9dbSNicholas Bellinger 121ea263c7fSMike Christie if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) 1226708bb27SAndy Grover pr_debug("IBLOCK: BLOCK Discard support available," 123c66ac9dbSNicholas Bellinger " disabled by default\n"); 1248a9ebe71SMike Christie 125f6970ad3SNicholas Bellinger /* 126f6970ad3SNicholas Bellinger * Enable write same emulation for IBLOCK and use 0xFFFF as 127f6970ad3SNicholas Bellinger * the smaller WRITE_SAME(10) only has a two-byte block count. 128f6970ad3SNicholas Bellinger */ 1292237498fSNicholas Bellinger max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); 1302237498fSNicholas Bellinger if (max_write_zeroes_sectors) 1312237498fSNicholas Bellinger dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; 1322237498fSNicholas Bellinger else 133f6970ad3SNicholas Bellinger dev->dev_attrib.max_write_same_len = 0xFFFF; 134c66ac9dbSNicholas Bellinger 135e22a7f07SRoland Dreier if (blk_queue_nonrot(q)) 1360fd97ccfSChristoph Hellwig dev->dev_attrib.is_nonrot = 1; 137d0c8b259SNicholas Bellinger 138ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(bd); 139ecebbf6cSNicholas Bellinger if (bi) { 140a47a28b7SKent Overstreet struct bio_set *bs = &ib_dev->ibd_bio_set; 141ecebbf6cSNicholas Bellinger 1420f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || 1430f8087ecSMartin K. Petersen !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { 144ecebbf6cSNicholas Bellinger pr_err("IBLOCK export of blk_integrity: %s not" 1450f8087ecSMartin K. Petersen " supported\n", bi->profile->name); 146ecebbf6cSNicholas Bellinger ret = -ENOSYS; 147ecebbf6cSNicholas Bellinger goto out_blkdev_put; 148ecebbf6cSNicholas Bellinger } 149ecebbf6cSNicholas Bellinger 1500f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { 151ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; 1520f8087ecSMartin K. Petersen } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { 153ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; 154ecebbf6cSNicholas Bellinger } 155ecebbf6cSNicholas Bellinger 156ecebbf6cSNicholas Bellinger if (dev->dev_attrib.pi_prot_type) { 157ecebbf6cSNicholas Bellinger if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { 158ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bioset for PI\n"); 159ecebbf6cSNicholas Bellinger ret = -ENOMEM; 160ecebbf6cSNicholas Bellinger goto out_blkdev_put; 161ecebbf6cSNicholas Bellinger } 162ecebbf6cSNicholas Bellinger pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", 163f4f8154aSKent Overstreet &bs->bio_integrity_pool); 164ecebbf6cSNicholas Bellinger } 165ecebbf6cSNicholas Bellinger dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; 166ecebbf6cSNicholas Bellinger } 167ecebbf6cSNicholas Bellinger 1680fd97ccfSChristoph Hellwig return 0; 169e22a7f07SRoland Dreier 170ecebbf6cSNicholas Bellinger out_blkdev_put: 171ecebbf6cSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 1720fd97ccfSChristoph Hellwig out_free_bioset: 173a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 1740fd97ccfSChristoph Hellwig out: 1750fd97ccfSChristoph Hellwig return ret; 176c66ac9dbSNicholas Bellinger } 177c66ac9dbSNicholas Bellinger 1784cc987eaSNicholas Bellinger static void iblock_dev_call_rcu(struct rcu_head *p) 1794cc987eaSNicholas Bellinger { 1804cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 1814cc987eaSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1824cc987eaSNicholas Bellinger 183415ccd98SMike Christie kfree(ib_dev->ibd_plug); 1844cc987eaSNicholas Bellinger kfree(ib_dev); 1854cc987eaSNicholas Bellinger } 1864cc987eaSNicholas Bellinger 1870fd97ccfSChristoph Hellwig static void iblock_free_device(struct se_device *dev) 188c66ac9dbSNicholas Bellinger { 18992634706SMike Christie call_rcu(&dev->rcu_head, iblock_dev_call_rcu); 19092634706SMike Christie } 19192634706SMike Christie 19292634706SMike Christie static void iblock_destroy_device(struct se_device *dev) 19392634706SMike Christie { 1940fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 195c66ac9dbSNicholas Bellinger 196bc665524SNicholas Bellinger if (ib_dev->ibd_bd != NULL) 197c66ac9dbSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 198a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 199c66ac9dbSNicholas Bellinger } 200c66ac9dbSNicholas Bellinger 201415ccd98SMike Christie static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) 202415ccd98SMike Christie { 203415ccd98SMike Christie struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); 204415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug; 205415ccd98SMike Christie 206415ccd98SMike Christie /* 2075aaeca25SMike Christie * Each se_device has a per cpu work this can be run from. We 208415ccd98SMike Christie * shouldn't have multiple threads on the same cpu calling this 209415ccd98SMike Christie * at the same time. 210415ccd98SMike Christie */ 2115aaeca25SMike Christie ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; 212415ccd98SMike Christie if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) 213415ccd98SMike Christie return NULL; 214415ccd98SMike Christie 215415ccd98SMike Christie blk_start_plug(&ib_dev_plug->blk_plug); 216415ccd98SMike Christie return &ib_dev_plug->se_plug; 217415ccd98SMike Christie } 218415ccd98SMike Christie 219415ccd98SMike Christie static void iblock_unplug_device(struct se_dev_plug *se_plug) 220415ccd98SMike Christie { 221415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, 222415ccd98SMike Christie struct iblock_dev_plug, se_plug); 223415ccd98SMike Christie 224415ccd98SMike Christie blk_finish_plug(&ib_dev_plug->blk_plug); 225415ccd98SMike Christie clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); 226415ccd98SMike Christie } 227415ccd98SMike Christie 228c66ac9dbSNicholas Bellinger static unsigned long long iblock_emulate_read_cap_with_block_size( 229c66ac9dbSNicholas Bellinger struct se_device *dev, 230c66ac9dbSNicholas Bellinger struct block_device *bd, 231c66ac9dbSNicholas Bellinger struct request_queue *q) 232c66ac9dbSNicholas Bellinger { 233c66ac9dbSNicholas Bellinger unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), 234c66ac9dbSNicholas Bellinger bdev_logical_block_size(bd)) - 1); 235c66ac9dbSNicholas Bellinger u32 block_size = bdev_logical_block_size(bd); 236c66ac9dbSNicholas Bellinger 2370fd97ccfSChristoph Hellwig if (block_size == dev->dev_attrib.block_size) 238c66ac9dbSNicholas Bellinger return blocks_long; 239c66ac9dbSNicholas Bellinger 240c66ac9dbSNicholas Bellinger switch (block_size) { 241c66ac9dbSNicholas Bellinger case 4096: 2420fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 243c66ac9dbSNicholas Bellinger case 2048: 244c66ac9dbSNicholas Bellinger blocks_long <<= 1; 245c66ac9dbSNicholas Bellinger break; 246c66ac9dbSNicholas Bellinger case 1024: 247c66ac9dbSNicholas Bellinger blocks_long <<= 2; 248c66ac9dbSNicholas Bellinger break; 249c66ac9dbSNicholas Bellinger case 512: 250c66ac9dbSNicholas Bellinger blocks_long <<= 3; 251492096ecSGustavo A. R. Silva break; 252c66ac9dbSNicholas Bellinger default: 253c66ac9dbSNicholas Bellinger break; 254c66ac9dbSNicholas Bellinger } 255c66ac9dbSNicholas Bellinger break; 256c66ac9dbSNicholas Bellinger case 2048: 2570fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 258c66ac9dbSNicholas Bellinger case 4096: 259c66ac9dbSNicholas Bellinger blocks_long >>= 1; 260c66ac9dbSNicholas Bellinger break; 261c66ac9dbSNicholas Bellinger case 1024: 262c66ac9dbSNicholas Bellinger blocks_long <<= 1; 263c66ac9dbSNicholas Bellinger break; 264c66ac9dbSNicholas Bellinger case 512: 265c66ac9dbSNicholas Bellinger blocks_long <<= 2; 266c66ac9dbSNicholas Bellinger break; 267c66ac9dbSNicholas Bellinger default: 268c66ac9dbSNicholas Bellinger break; 269c66ac9dbSNicholas Bellinger } 270c66ac9dbSNicholas Bellinger break; 271c66ac9dbSNicholas Bellinger case 1024: 2720fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 273c66ac9dbSNicholas Bellinger case 4096: 274c66ac9dbSNicholas Bellinger blocks_long >>= 2; 275c66ac9dbSNicholas Bellinger break; 276c66ac9dbSNicholas Bellinger case 2048: 277c66ac9dbSNicholas Bellinger blocks_long >>= 1; 278c66ac9dbSNicholas Bellinger break; 279c66ac9dbSNicholas Bellinger case 512: 280c66ac9dbSNicholas Bellinger blocks_long <<= 1; 281c66ac9dbSNicholas Bellinger break; 282c66ac9dbSNicholas Bellinger default: 283c66ac9dbSNicholas Bellinger break; 284c66ac9dbSNicholas Bellinger } 285c66ac9dbSNicholas Bellinger break; 286c66ac9dbSNicholas Bellinger case 512: 2870fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 288c66ac9dbSNicholas Bellinger case 4096: 289c66ac9dbSNicholas Bellinger blocks_long >>= 3; 290c66ac9dbSNicholas Bellinger break; 291c66ac9dbSNicholas Bellinger case 2048: 292c66ac9dbSNicholas Bellinger blocks_long >>= 2; 293c66ac9dbSNicholas Bellinger break; 294c66ac9dbSNicholas Bellinger case 1024: 295c66ac9dbSNicholas Bellinger blocks_long >>= 1; 296c66ac9dbSNicholas Bellinger break; 297c66ac9dbSNicholas Bellinger default: 298c66ac9dbSNicholas Bellinger break; 299c66ac9dbSNicholas Bellinger } 300c66ac9dbSNicholas Bellinger break; 301c66ac9dbSNicholas Bellinger default: 302c66ac9dbSNicholas Bellinger break; 303c66ac9dbSNicholas Bellinger } 304c66ac9dbSNicholas Bellinger 305c66ac9dbSNicholas Bellinger return blocks_long; 306c66ac9dbSNicholas Bellinger } 307c66ac9dbSNicholas Bellinger 3083a41d85fSNicholas Bellinger static void iblock_complete_cmd(struct se_cmd *cmd) 3093a41d85fSNicholas Bellinger { 3103a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3113a41d85fSNicholas Bellinger u8 status; 3123a41d85fSNicholas Bellinger 3135981c245SElena Reshetova if (!refcount_dec_and_test(&ibr->pending)) 3143a41d85fSNicholas Bellinger return; 3153a41d85fSNicholas Bellinger 3163a41d85fSNicholas Bellinger if (atomic_read(&ibr->ib_bio_err_cnt)) 3173a41d85fSNicholas Bellinger status = SAM_STAT_CHECK_CONDITION; 3183a41d85fSNicholas Bellinger else 3193a41d85fSNicholas Bellinger status = SAM_STAT_GOOD; 3203a41d85fSNicholas Bellinger 3213a41d85fSNicholas Bellinger target_complete_cmd(cmd, status); 3223a41d85fSNicholas Bellinger kfree(ibr); 3233a41d85fSNicholas Bellinger } 3243a41d85fSNicholas Bellinger 3254246a0b6SChristoph Hellwig static void iblock_bio_done(struct bio *bio) 3263a41d85fSNicholas Bellinger { 3273a41d85fSNicholas Bellinger struct se_cmd *cmd = bio->bi_private; 3283a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3293a41d85fSNicholas Bellinger 3304e4cbee9SChristoph Hellwig if (bio->bi_status) { 3314e4cbee9SChristoph Hellwig pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); 3323a41d85fSNicholas Bellinger /* 3333a41d85fSNicholas Bellinger * Bump the ib_bio_err_cnt and release bio. 3343a41d85fSNicholas Bellinger */ 3353a41d85fSNicholas Bellinger atomic_inc(&ibr->ib_bio_err_cnt); 3364e857c58SPeter Zijlstra smp_mb__after_atomic(); 3373a41d85fSNicholas Bellinger } 3383a41d85fSNicholas Bellinger 3393a41d85fSNicholas Bellinger bio_put(bio); 3403a41d85fSNicholas Bellinger 3413a41d85fSNicholas Bellinger iblock_complete_cmd(cmd); 3423a41d85fSNicholas Bellinger } 3433a41d85fSNicholas Bellinger 344bc9e0e36SChaitanya Kulkarni static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, 345bc9e0e36SChaitanya Kulkarni unsigned int opf) 3463a41d85fSNicholas Bellinger { 3473a41d85fSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 3483a41d85fSNicholas Bellinger struct bio *bio; 3493a41d85fSNicholas Bellinger 3503a41d85fSNicholas Bellinger /* 3513a41d85fSNicholas Bellinger * Only allocate as many vector entries as the bio code allows us to, 3523a41d85fSNicholas Bellinger * we'll loop later on until we have handled the whole request. 3533a41d85fSNicholas Bellinger */ 3545f7136dbSMatthew Wilcox (Oracle) bio = bio_alloc_bioset(GFP_NOIO, bio_max_segs(sg_num), 3555f7136dbSMatthew Wilcox (Oracle) &ib_dev->ibd_bio_set); 3563a41d85fSNicholas Bellinger if (!bio) { 3573a41d85fSNicholas Bellinger pr_err("Unable to allocate memory for bio\n"); 3583a41d85fSNicholas Bellinger return NULL; 3593a41d85fSNicholas Bellinger } 3603a41d85fSNicholas Bellinger 36174d46992SChristoph Hellwig bio_set_dev(bio, ib_dev->ibd_bd); 3623a41d85fSNicholas Bellinger bio->bi_private = cmd; 3633a41d85fSNicholas Bellinger bio->bi_end_io = &iblock_bio_done; 3644f024f37SKent Overstreet bio->bi_iter.bi_sector = lba; 365bc9e0e36SChaitanya Kulkarni bio->bi_opf = opf; 3663a41d85fSNicholas Bellinger 3673a41d85fSNicholas Bellinger return bio; 3683a41d85fSNicholas Bellinger } 3693a41d85fSNicholas Bellinger 3704e49ea4aSMike Christie static void iblock_submit_bios(struct bio_list *list) 3713a41d85fSNicholas Bellinger { 3723a41d85fSNicholas Bellinger struct blk_plug plug; 3733a41d85fSNicholas Bellinger struct bio *bio; 374415ccd98SMike Christie /* 375415ccd98SMike Christie * The block layer handles nested plugs, so just plug/unplug to handle 376415ccd98SMike Christie * fabric drivers that didn't support batching and multi bio cmds. 377415ccd98SMike Christie */ 3783a41d85fSNicholas Bellinger blk_start_plug(&plug); 3793a41d85fSNicholas Bellinger while ((bio = bio_list_pop(list))) 3804e49ea4aSMike Christie submit_bio(bio); 3813a41d85fSNicholas Bellinger blk_finish_plug(&plug); 3823a41d85fSNicholas Bellinger } 3833a41d85fSNicholas Bellinger 3844246a0b6SChristoph Hellwig static void iblock_end_io_flush(struct bio *bio) 385df5fa691SChristoph Hellwig { 386df5fa691SChristoph Hellwig struct se_cmd *cmd = bio->bi_private; 387df5fa691SChristoph Hellwig 3884e4cbee9SChristoph Hellwig if (bio->bi_status) 3894e4cbee9SChristoph Hellwig pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); 390df5fa691SChristoph Hellwig 3915787cacdSChristoph Hellwig if (cmd) { 3924e4cbee9SChristoph Hellwig if (bio->bi_status) 3935787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 394de103c93SChristoph Hellwig else 3955787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 3965787cacdSChristoph Hellwig } 3975787cacdSChristoph Hellwig 398df5fa691SChristoph Hellwig bio_put(bio); 399df5fa691SChristoph Hellwig } 400df5fa691SChristoph Hellwig 401c66ac9dbSNicholas Bellinger /* 402df5fa691SChristoph Hellwig * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must 403df5fa691SChristoph Hellwig * always flush the whole cache. 404c66ac9dbSNicholas Bellinger */ 405de103c93SChristoph Hellwig static sense_reason_t 406de103c93SChristoph Hellwig iblock_execute_sync_cache(struct se_cmd *cmd) 407c66ac9dbSNicholas Bellinger { 4080fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 409a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 410df5fa691SChristoph Hellwig struct bio *bio; 411c66ac9dbSNicholas Bellinger 412c66ac9dbSNicholas Bellinger /* 413c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 414df5fa691SChristoph Hellwig * for this SYNCHRONIZE_CACHE op. 415c66ac9dbSNicholas Bellinger */ 416c66ac9dbSNicholas Bellinger if (immed) 4175787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 418c66ac9dbSNicholas Bellinger 419df5fa691SChristoph Hellwig bio = bio_alloc(GFP_KERNEL, 0); 420df5fa691SChristoph Hellwig bio->bi_end_io = iblock_end_io_flush; 42174d46992SChristoph Hellwig bio_set_dev(bio, ib_dev->ibd_bd); 42270fd7614SChristoph Hellwig bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; 423c66ac9dbSNicholas Bellinger if (!immed) 424df5fa691SChristoph Hellwig bio->bi_private = cmd; 4254e49ea4aSMike Christie submit_bio(bio); 426ad67f0d9SChristoph Hellwig return 0; 427c66ac9dbSNicholas Bellinger } 428c66ac9dbSNicholas Bellinger 429de103c93SChristoph Hellwig static sense_reason_t 43062e46942SChristoph Hellwig iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 431dbc21c5aSAsias He { 43262e46942SChristoph Hellwig struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 4338a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 434dbc21c5aSAsias He int ret; 435dbc21c5aSAsias He 4368a9ebe71SMike Christie ret = blkdev_issue_discard(bdev, 4378a9ebe71SMike Christie target_to_linux_sector(dev, lba), 4388a9ebe71SMike Christie target_to_linux_sector(dev, nolb), 4398a9ebe71SMike Christie GFP_KERNEL, 0); 440dbc21c5aSAsias He if (ret < 0) { 441dbc21c5aSAsias He pr_err("blkdev_issue_discard() failed: %d\n", ret); 442dbc21c5aSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 443dbc21c5aSAsias He } 444dbc21c5aSAsias He 445dbc21c5aSAsias He return 0; 446dbc21c5aSAsias He } 447dbc21c5aSAsias He 448dbc21c5aSAsias He static sense_reason_t 4492237498fSNicholas Bellinger iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) 45007b63196SMike Christie { 45107b63196SMike Christie struct se_device *dev = cmd->se_dev; 45207b63196SMike Christie struct scatterlist *sg = &cmd->t_data_sg[0]; 453f5957dadSBryant G Ly unsigned char *buf, *not_zero; 454f5957dadSBryant G Ly int ret; 45507b63196SMike Christie 4562237498fSNicholas Bellinger buf = kmap(sg_page(sg)) + sg->offset; 4572237498fSNicholas Bellinger if (!buf) 4582237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4592237498fSNicholas Bellinger /* 4602237498fSNicholas Bellinger * Fall back to block_execute_write_same() slow-path if 4612237498fSNicholas Bellinger * incoming WRITE_SAME payload does not contain zeros. 4622237498fSNicholas Bellinger */ 463f5957dadSBryant G Ly not_zero = memchr_inv(buf, 0x00, cmd->data_length); 4642237498fSNicholas Bellinger kunmap(sg_page(sg)); 46507b63196SMike Christie 466f5957dadSBryant G Ly if (not_zero) 4672237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4682237498fSNicholas Bellinger 4692237498fSNicholas Bellinger ret = blkdev_issue_zeroout(bdev, 47007b63196SMike Christie target_to_linux_sector(dev, cmd->t_task_lba), 47107b63196SMike Christie target_to_linux_sector(dev, 47207b63196SMike Christie sbc_get_write_same_sectors(cmd)), 4731d2ff149SDavid Disseldorp GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); 47407b63196SMike Christie if (ret) 47507b63196SMike Christie return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 47607b63196SMike Christie 47714b40c1eSHannes Reinecke target_complete_cmd(cmd, SAM_STAT_GOOD); 47807b63196SMike Christie return 0; 47907b63196SMike Christie } 48007b63196SMike Christie 48107b63196SMike Christie static sense_reason_t 482f6970ad3SNicholas Bellinger iblock_execute_write_same(struct se_cmd *cmd) 483f6970ad3SNicholas Bellinger { 48407b63196SMike Christie struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 485f6970ad3SNicholas Bellinger struct iblock_req *ibr; 486f6970ad3SNicholas Bellinger struct scatterlist *sg; 487f6970ad3SNicholas Bellinger struct bio *bio; 488f6970ad3SNicholas Bellinger struct bio_list list; 4898a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 4908a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 4918a9ebe71SMike Christie sector_t sectors = target_to_linux_sector(dev, 4928a9ebe71SMike Christie sbc_get_write_same_sectors(cmd)); 493f6970ad3SNicholas Bellinger 494afd73f1bSNicholas Bellinger if (cmd->prot_op) { 495afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with IBLOCK" 496afd73f1bSNicholas Bellinger " backends not supported\n"); 497afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 498afd73f1bSNicholas Bellinger } 499f6970ad3SNicholas Bellinger sg = &cmd->t_data_sg[0]; 500f6970ad3SNicholas Bellinger 501f6970ad3SNicholas Bellinger if (cmd->t_data_nents > 1 || 502f6970ad3SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 503f6970ad3SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 504f6970ad3SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 505f6970ad3SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 506f6970ad3SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 507f6970ad3SNicholas Bellinger } 508f6970ad3SNicholas Bellinger 5092237498fSNicholas Bellinger if (bdev_write_zeroes_sectors(bdev)) { 5102237498fSNicholas Bellinger if (!iblock_execute_zero_out(bdev, cmd)) 5112237498fSNicholas Bellinger return 0; 5122237498fSNicholas Bellinger } 51307b63196SMike Christie 514f6970ad3SNicholas Bellinger ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 515f6970ad3SNicholas Bellinger if (!ibr) 516f6970ad3SNicholas Bellinger goto fail; 517f6970ad3SNicholas Bellinger cmd->priv = ibr; 518f6970ad3SNicholas Bellinger 519bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 520f6970ad3SNicholas Bellinger if (!bio) 521f6970ad3SNicholas Bellinger goto fail_free_ibr; 522f6970ad3SNicholas Bellinger 523f6970ad3SNicholas Bellinger bio_list_init(&list); 524f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 525f6970ad3SNicholas Bellinger 5265981c245SElena Reshetova refcount_set(&ibr->pending, 1); 527f6970ad3SNicholas Bellinger 528f6970ad3SNicholas Bellinger while (sectors) { 529f6970ad3SNicholas Bellinger while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 530f6970ad3SNicholas Bellinger != sg->length) { 531f6970ad3SNicholas Bellinger 532bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 533f6970ad3SNicholas Bellinger if (!bio) 534f6970ad3SNicholas Bellinger goto fail_put_bios; 535f6970ad3SNicholas Bellinger 5365981c245SElena Reshetova refcount_inc(&ibr->pending); 537f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 538f6970ad3SNicholas Bellinger } 539f6970ad3SNicholas Bellinger 540f6970ad3SNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 54180b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 5425676234fSRoman Bolshakov sectors -= sg->length >> SECTOR_SHIFT; 543f6970ad3SNicholas Bellinger } 544f6970ad3SNicholas Bellinger 5454e49ea4aSMike Christie iblock_submit_bios(&list); 546f6970ad3SNicholas Bellinger return 0; 547f6970ad3SNicholas Bellinger 548f6970ad3SNicholas Bellinger fail_put_bios: 549f6970ad3SNicholas Bellinger while ((bio = bio_list_pop(&list))) 550f6970ad3SNicholas Bellinger bio_put(bio); 551f6970ad3SNicholas Bellinger fail_free_ibr: 552f6970ad3SNicholas Bellinger kfree(ibr); 553f6970ad3SNicholas Bellinger fail: 554f6970ad3SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 555f6970ad3SNicholas Bellinger } 556f6970ad3SNicholas Bellinger 557c66ac9dbSNicholas Bellinger enum { 55844bfd018SAndy Grover Opt_udev_path, Opt_readonly, Opt_force, Opt_err 559c66ac9dbSNicholas Bellinger }; 560c66ac9dbSNicholas Bellinger 561c66ac9dbSNicholas Bellinger static match_table_t tokens = { 562c66ac9dbSNicholas Bellinger {Opt_udev_path, "udev_path=%s"}, 56344bfd018SAndy Grover {Opt_readonly, "readonly=%d"}, 564c66ac9dbSNicholas Bellinger {Opt_force, "force=%d"}, 565c66ac9dbSNicholas Bellinger {Opt_err, NULL} 566c66ac9dbSNicholas Bellinger }; 567c66ac9dbSNicholas Bellinger 5680fd97ccfSChristoph Hellwig static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, 569c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 570c66ac9dbSNicholas Bellinger { 5710fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 5726d180253SJesper Juhl char *orig, *ptr, *arg_p, *opts; 573c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 57421bca31cSRoland Dreier int ret = 0, token; 57544bfd018SAndy Grover unsigned long tmp_readonly; 576c66ac9dbSNicholas Bellinger 577c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 578c66ac9dbSNicholas Bellinger if (!opts) 579c66ac9dbSNicholas Bellinger return -ENOMEM; 580c66ac9dbSNicholas Bellinger 581c66ac9dbSNicholas Bellinger orig = opts; 582c66ac9dbSNicholas Bellinger 58390c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 584c66ac9dbSNicholas Bellinger if (!*ptr) 585c66ac9dbSNicholas Bellinger continue; 586c66ac9dbSNicholas Bellinger 587c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 588c66ac9dbSNicholas Bellinger switch (token) { 589c66ac9dbSNicholas Bellinger case Opt_udev_path: 590c66ac9dbSNicholas Bellinger if (ib_dev->ibd_bd) { 5916708bb27SAndy Grover pr_err("Unable to set udev_path= while" 592c66ac9dbSNicholas Bellinger " ib_dev->ibd_bd exists\n"); 593c66ac9dbSNicholas Bellinger ret = -EEXIST; 594c66ac9dbSNicholas Bellinger goto out; 595c66ac9dbSNicholas Bellinger } 596852b6ed1SNicholas Bellinger if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], 597852b6ed1SNicholas Bellinger SE_UDEV_PATH_LEN) == 0) { 598852b6ed1SNicholas Bellinger ret = -EINVAL; 5996d180253SJesper Juhl break; 6006d180253SJesper Juhl } 6016708bb27SAndy Grover pr_debug("IBLOCK: Referencing UDEV path: %s\n", 602c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 603c66ac9dbSNicholas Bellinger ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 604c66ac9dbSNicholas Bellinger break; 60544bfd018SAndy Grover case Opt_readonly: 60644bfd018SAndy Grover arg_p = match_strdup(&args[0]); 60744bfd018SAndy Grover if (!arg_p) { 60844bfd018SAndy Grover ret = -ENOMEM; 60944bfd018SAndy Grover break; 61044bfd018SAndy Grover } 61157103d7fSJingoo Han ret = kstrtoul(arg_p, 0, &tmp_readonly); 61244bfd018SAndy Grover kfree(arg_p); 61344bfd018SAndy Grover if (ret < 0) { 61457103d7fSJingoo Han pr_err("kstrtoul() failed for" 61544bfd018SAndy Grover " readonly=\n"); 61644bfd018SAndy Grover goto out; 61744bfd018SAndy Grover } 61844bfd018SAndy Grover ib_dev->ibd_readonly = tmp_readonly; 61944bfd018SAndy Grover pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); 62044bfd018SAndy Grover break; 621c66ac9dbSNicholas Bellinger case Opt_force: 622c66ac9dbSNicholas Bellinger break; 623c66ac9dbSNicholas Bellinger default: 624c66ac9dbSNicholas Bellinger break; 625c66ac9dbSNicholas Bellinger } 626c66ac9dbSNicholas Bellinger } 627c66ac9dbSNicholas Bellinger 628c66ac9dbSNicholas Bellinger out: 629c66ac9dbSNicholas Bellinger kfree(orig); 630c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 631c66ac9dbSNicholas Bellinger } 632c66ac9dbSNicholas Bellinger 6330fd97ccfSChristoph Hellwig static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) 634c66ac9dbSNicholas Bellinger { 6350fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 6360fd97ccfSChristoph Hellwig struct block_device *bd = ib_dev->ibd_bd; 637c66ac9dbSNicholas Bellinger ssize_t bl = 0; 638c66ac9dbSNicholas Bellinger 639c66ac9dbSNicholas Bellinger if (bd) 640*1b74ab77SChristoph Hellwig bl += sprintf(b + bl, "iBlock device: %pg", bd); 6410fd97ccfSChristoph Hellwig if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) 64244bfd018SAndy Grover bl += sprintf(b + bl, " UDEV PATH: %s", 6430fd97ccfSChristoph Hellwig ib_dev->ibd_udev_path); 6440fd97ccfSChristoph Hellwig bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); 645c66ac9dbSNicholas Bellinger 646c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " "); 647c66ac9dbSNicholas Bellinger if (bd) { 648c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 64957ba1059SChristoph Hellwig MAJOR(bd->bd_dev), MINOR(bd->bd_dev), 65057ba1059SChristoph Hellwig "CLAIMED: IBLOCK"); 651c66ac9dbSNicholas Bellinger } else { 65221bca31cSRoland Dreier bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 653c66ac9dbSNicholas Bellinger } 654c66ac9dbSNicholas Bellinger 655c66ac9dbSNicholas Bellinger return bl; 656c66ac9dbSNicholas Bellinger } 657c66ac9dbSNicholas Bellinger 658ecebbf6cSNicholas Bellinger static int 659fed564f6SGreg Edwards iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, 660fed564f6SGreg Edwards struct sg_mapping_iter *miter) 661ecebbf6cSNicholas Bellinger { 662ecebbf6cSNicholas Bellinger struct se_device *dev = cmd->se_dev; 663ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 664ecebbf6cSNicholas Bellinger struct bio_integrity_payload *bip; 665ecebbf6cSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 666fed564f6SGreg Edwards int rc; 667fed564f6SGreg Edwards size_t resid, len; 668ecebbf6cSNicholas Bellinger 669ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(ib_dev->ibd_bd); 670ecebbf6cSNicholas Bellinger if (!bi) { 671ecebbf6cSNicholas Bellinger pr_err("Unable to locate bio_integrity\n"); 672ecebbf6cSNicholas Bellinger return -ENODEV; 673ecebbf6cSNicholas Bellinger } 674ecebbf6cSNicholas Bellinger 6755f7136dbSMatthew Wilcox (Oracle) bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); 67606c1e390SKeith Busch if (IS_ERR(bip)) { 677ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bio_integrity_payload\n"); 67806c1e390SKeith Busch return PTR_ERR(bip); 679ecebbf6cSNicholas Bellinger } 680ecebbf6cSNicholas Bellinger 681fed564f6SGreg Edwards bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); 682e4dc9a4cSIsrael Rukshin /* virtual start sector must be in integrity interval units */ 683e4dc9a4cSIsrael Rukshin bip_set_seed(bip, bio->bi_iter.bi_sector >> 684e4dc9a4cSIsrael Rukshin (bi->interval_exp - SECTOR_SHIFT)); 685ecebbf6cSNicholas Bellinger 6864e13c5d0SLinus Torvalds pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, 6874e13c5d0SLinus Torvalds (unsigned long long)bip->bip_iter.bi_sector); 688ecebbf6cSNicholas Bellinger 689fed564f6SGreg Edwards resid = bip->bip_iter.bi_size; 690fed564f6SGreg Edwards while (resid > 0 && sg_miter_next(miter)) { 691ecebbf6cSNicholas Bellinger 692fed564f6SGreg Edwards len = min_t(size_t, miter->length, resid); 693fed564f6SGreg Edwards rc = bio_integrity_add_page(bio, miter->page, len, 694fed564f6SGreg Edwards offset_in_page(miter->addr)); 695fed564f6SGreg Edwards if (rc != len) { 696ecebbf6cSNicholas Bellinger pr_err("bio_integrity_add_page() failed; %d\n", rc); 697fed564f6SGreg Edwards sg_miter_stop(miter); 698ecebbf6cSNicholas Bellinger return -ENOMEM; 699ecebbf6cSNicholas Bellinger } 700ecebbf6cSNicholas Bellinger 701fed564f6SGreg Edwards pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", 702fed564f6SGreg Edwards miter->page, len, offset_in_page(miter->addr)); 703fed564f6SGreg Edwards 704fed564f6SGreg Edwards resid -= len; 705fed564f6SGreg Edwards if (len < miter->length) 706fed564f6SGreg Edwards miter->consumed -= miter->length - len; 707ecebbf6cSNicholas Bellinger } 708fed564f6SGreg Edwards sg_miter_stop(miter); 709ecebbf6cSNicholas Bellinger 710ecebbf6cSNicholas Bellinger return 0; 711ecebbf6cSNicholas Bellinger } 712ecebbf6cSNicholas Bellinger 713de103c93SChristoph Hellwig static sense_reason_t 714a82a9538SNicholas Bellinger iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 715a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 716c66ac9dbSNicholas Bellinger { 7175951146dSAndy Grover struct se_device *dev = cmd->se_dev; 7188a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 7195787cacdSChristoph Hellwig struct iblock_req *ibr; 720fed564f6SGreg Edwards struct bio *bio; 721dbbf3e94SChristoph Hellwig struct bio_list list; 722c66ac9dbSNicholas Bellinger struct scatterlist *sg; 7235787cacdSChristoph Hellwig u32 sg_num = sgl_nents; 724bc9e0e36SChaitanya Kulkarni unsigned int opf; 725d5b4a21bSChristoph Hellwig unsigned bio_cnt; 726bc9e0e36SChaitanya Kulkarni int i, rc; 727fed564f6SGreg Edwards struct sg_mapping_iter prot_miter; 728bc9e0e36SChaitanya Kulkarni unsigned int miter_dir; 729dbbf3e94SChristoph Hellwig 7305787cacdSChristoph Hellwig if (data_direction == DMA_TO_DEVICE) { 731d0c8b259SNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 732d0c8b259SNicholas Bellinger struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); 733dbbf3e94SChristoph Hellwig /* 73470fd7614SChristoph Hellwig * Force writethrough using REQ_FUA if a volatile write cache 735d0c8b259SNicholas Bellinger * is not enabled, or if initiator set the Force Unit Access bit. 736dbbf3e94SChristoph Hellwig */ 737bc9e0e36SChaitanya Kulkarni opf = REQ_OP_WRITE; 738bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_TO_SG; 739c888a8f9SJens Axboe if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { 740d0c8b259SNicholas Bellinger if (cmd->se_cmd_flags & SCF_FUA) 741bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 742c888a8f9SJens Axboe else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) 743bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 744d0c8b259SNicholas Bellinger } 745dbbf3e94SChristoph Hellwig } else { 746bc9e0e36SChaitanya Kulkarni opf = REQ_OP_READ; 747bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_FROM_SG; 748dbbf3e94SChristoph Hellwig } 749dbbf3e94SChristoph Hellwig 7505787cacdSChristoph Hellwig ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 7515787cacdSChristoph Hellwig if (!ibr) 7525787cacdSChristoph Hellwig goto fail; 7535787cacdSChristoph Hellwig cmd->priv = ibr; 7545787cacdSChristoph Hellwig 755e0de4457SPaolo Bonzini if (!sgl_nents) { 7565981c245SElena Reshetova refcount_set(&ibr->pending, 1); 757e0de4457SPaolo Bonzini iblock_complete_cmd(cmd); 758e0de4457SPaolo Bonzini return 0; 759e0de4457SPaolo Bonzini } 760e0de4457SPaolo Bonzini 761bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); 7625787cacdSChristoph Hellwig if (!bio) 7635787cacdSChristoph Hellwig goto fail_free_ibr; 764c66ac9dbSNicholas Bellinger 765dbbf3e94SChristoph Hellwig bio_list_init(&list); 766dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 7675787cacdSChristoph Hellwig 7685981c245SElena Reshetova refcount_set(&ibr->pending, 2); 769d5b4a21bSChristoph Hellwig bio_cnt = 1; 770dbbf3e94SChristoph Hellwig 771fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) 772fed564f6SGreg Edwards sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, 773bc9e0e36SChaitanya Kulkarni miter_dir); 774fed564f6SGreg Edwards 7755787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 776dbbf3e94SChristoph Hellwig /* 777dbbf3e94SChristoph Hellwig * XXX: if the length the device accepts is shorter than the 778dbbf3e94SChristoph Hellwig * length of the S/G list entry this will cause and 779dbbf3e94SChristoph Hellwig * endless loop. Better hope no driver uses huge pages. 780dbbf3e94SChristoph Hellwig */ 781dbbf3e94SChristoph Hellwig while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 782dbbf3e94SChristoph Hellwig != sg->length) { 783fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 784fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 785fed564f6SGreg Edwards if (rc) 786fed564f6SGreg Edwards goto fail_put_bios; 787fed564f6SGreg Edwards } 788fed564f6SGreg Edwards 789d5b4a21bSChristoph Hellwig if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 7904e49ea4aSMike Christie iblock_submit_bios(&list); 791d5b4a21bSChristoph Hellwig bio_cnt = 0; 792d5b4a21bSChristoph Hellwig } 793d5b4a21bSChristoph Hellwig 794bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sg_num, opf); 7956708bb27SAndy Grover if (!bio) 7965787cacdSChristoph Hellwig goto fail_put_bios; 7975787cacdSChristoph Hellwig 7985981c245SElena Reshetova refcount_inc(&ibr->pending); 799dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 800d5b4a21bSChristoph Hellwig bio_cnt++; 801c66ac9dbSNicholas Bellinger } 802dbbf3e94SChristoph Hellwig 803c66ac9dbSNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 80480b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 805c66ac9dbSNicholas Bellinger sg_num--; 806c66ac9dbSNicholas Bellinger } 807c66ac9dbSNicholas Bellinger 8086f16ec43SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 809fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 810ecebbf6cSNicholas Bellinger if (rc) 811ecebbf6cSNicholas Bellinger goto fail_put_bios; 812ecebbf6cSNicholas Bellinger } 813ecebbf6cSNicholas Bellinger 8144e49ea4aSMike Christie iblock_submit_bios(&list); 8155787cacdSChristoph Hellwig iblock_complete_cmd(cmd); 81603e98c9eSNicholas Bellinger return 0; 817dbbf3e94SChristoph Hellwig 8185787cacdSChristoph Hellwig fail_put_bios: 819dbbf3e94SChristoph Hellwig while ((bio = bio_list_pop(&list))) 820c66ac9dbSNicholas Bellinger bio_put(bio); 8215787cacdSChristoph Hellwig fail_free_ibr: 8225787cacdSChristoph Hellwig kfree(ibr); 8235787cacdSChristoph Hellwig fail: 824de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 825c66ac9dbSNicholas Bellinger } 826c66ac9dbSNicholas Bellinger 827c66ac9dbSNicholas Bellinger static sector_t iblock_get_blocks(struct se_device *dev) 828c66ac9dbSNicholas Bellinger { 8290fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8300fd97ccfSChristoph Hellwig struct block_device *bd = ib_dev->ibd_bd; 831c66ac9dbSNicholas Bellinger struct request_queue *q = bdev_get_queue(bd); 832c66ac9dbSNicholas Bellinger 833c66ac9dbSNicholas Bellinger return iblock_emulate_read_cap_with_block_size(dev, bd, q); 834c66ac9dbSNicholas Bellinger } 835c66ac9dbSNicholas Bellinger 8367f7caf6aSAndy Grover static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) 8377f7caf6aSAndy Grover { 8387f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8397f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8407f7caf6aSAndy Grover int ret; 8417f7caf6aSAndy Grover 8427f7caf6aSAndy Grover ret = bdev_alignment_offset(bd); 8437f7caf6aSAndy Grover if (ret == -1) 8447f7caf6aSAndy Grover return 0; 8457f7caf6aSAndy Grover 8467f7caf6aSAndy Grover /* convert offset-bytes to offset-lbas */ 8477f7caf6aSAndy Grover return ret / bdev_logical_block_size(bd); 8487f7caf6aSAndy Grover } 8497f7caf6aSAndy Grover 8507f7caf6aSAndy Grover static unsigned int iblock_get_lbppbe(struct se_device *dev) 8517f7caf6aSAndy Grover { 8527f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8537f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 854c151eddbSChaitanya Kulkarni unsigned int logs_per_phys = 855a2c6c6a3SChaitanya Kulkarni bdev_physical_block_size(bd) / bdev_logical_block_size(bd); 8567f7caf6aSAndy Grover 8577f7caf6aSAndy Grover return ilog2(logs_per_phys); 8587f7caf6aSAndy Grover } 8597f7caf6aSAndy Grover 8607f7caf6aSAndy Grover static unsigned int iblock_get_io_min(struct se_device *dev) 8617f7caf6aSAndy Grover { 8627f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8637f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8647f7caf6aSAndy Grover 8657f7caf6aSAndy Grover return bdev_io_min(bd); 8667f7caf6aSAndy Grover } 8677f7caf6aSAndy Grover 8687f7caf6aSAndy Grover static unsigned int iblock_get_io_opt(struct se_device *dev) 8697f7caf6aSAndy Grover { 8707f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8717f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8727f7caf6aSAndy Grover 8737f7caf6aSAndy Grover return bdev_io_opt(bd); 8747f7caf6aSAndy Grover } 8757f7caf6aSAndy Grover 8769e999a6cSChristoph Hellwig static struct sbc_ops iblock_sbc_ops = { 8770c2ad7d1SChristoph Hellwig .execute_rw = iblock_execute_rw, 878ad67f0d9SChristoph Hellwig .execute_sync_cache = iblock_execute_sync_cache, 8796f974e8cSChristoph Hellwig .execute_write_same = iblock_execute_write_same, 88014150a6bSChristoph Hellwig .execute_unmap = iblock_execute_unmap, 8810c2ad7d1SChristoph Hellwig }; 8820c2ad7d1SChristoph Hellwig 883de103c93SChristoph Hellwig static sense_reason_t 884de103c93SChristoph Hellwig iblock_parse_cdb(struct se_cmd *cmd) 8850c2ad7d1SChristoph Hellwig { 8869e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &iblock_sbc_ops); 8870c2ad7d1SChristoph Hellwig } 8880c2ad7d1SChristoph Hellwig 889452e2010SRashika Kheria static bool iblock_get_write_cache(struct se_device *dev) 890d0c8b259SNicholas Bellinger { 891d0c8b259SNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 892d0c8b259SNicholas Bellinger struct block_device *bd = ib_dev->ibd_bd; 893d0c8b259SNicholas Bellinger struct request_queue *q = bdev_get_queue(bd); 894d0c8b259SNicholas Bellinger 895c888a8f9SJens Axboe return test_bit(QUEUE_FLAG_WC, &q->queue_flags); 896d0c8b259SNicholas Bellinger } 897d0c8b259SNicholas Bellinger 8980a06d430SChristoph Hellwig static const struct target_backend_ops iblock_ops = { 899c66ac9dbSNicholas Bellinger .name = "iblock", 9000fd97ccfSChristoph Hellwig .inquiry_prod = "IBLOCK", 9010fd97ccfSChristoph Hellwig .inquiry_rev = IBLOCK_VERSION, 902c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 903c66ac9dbSNicholas Bellinger .attach_hba = iblock_attach_hba, 904c66ac9dbSNicholas Bellinger .detach_hba = iblock_detach_hba, 9050fd97ccfSChristoph Hellwig .alloc_device = iblock_alloc_device, 9060fd97ccfSChristoph Hellwig .configure_device = iblock_configure_device, 90792634706SMike Christie .destroy_device = iblock_destroy_device, 908c66ac9dbSNicholas Bellinger .free_device = iblock_free_device, 909415ccd98SMike Christie .plug_device = iblock_plug_device, 910415ccd98SMike Christie .unplug_device = iblock_unplug_device, 9110c2ad7d1SChristoph Hellwig .parse_cdb = iblock_parse_cdb, 912c66ac9dbSNicholas Bellinger .set_configfs_dev_params = iblock_set_configfs_dev_params, 913c66ac9dbSNicholas Bellinger .show_configfs_dev_params = iblock_show_configfs_dev_params, 9146f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 915c66ac9dbSNicholas Bellinger .get_blocks = iblock_get_blocks, 9167f7caf6aSAndy Grover .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, 9177f7caf6aSAndy Grover .get_lbppbe = iblock_get_lbppbe, 9187f7caf6aSAndy Grover .get_io_min = iblock_get_io_min, 9197f7caf6aSAndy Grover .get_io_opt = iblock_get_io_opt, 920d0c8b259SNicholas Bellinger .get_write_cache = iblock_get_write_cache, 9215873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 922c66ac9dbSNicholas Bellinger }; 923c66ac9dbSNicholas Bellinger 924c66ac9dbSNicholas Bellinger static int __init iblock_module_init(void) 925c66ac9dbSNicholas Bellinger { 9260a06d430SChristoph Hellwig return transport_backend_register(&iblock_ops); 927c66ac9dbSNicholas Bellinger } 928c66ac9dbSNicholas Bellinger 92963b91d5aSAsias He static void __exit iblock_module_exit(void) 930c66ac9dbSNicholas Bellinger { 9310a06d430SChristoph Hellwig target_backend_unregister(&iblock_ops); 932c66ac9dbSNicholas Bellinger } 933c66ac9dbSNicholas Bellinger 934c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 935c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 936c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 937c66ac9dbSNicholas Bellinger 938c66ac9dbSNicholas Bellinger module_init(iblock_module_init); 939c66ac9dbSNicholas Bellinger module_exit(iblock_module_exit); 940