1a61127c2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 27c9e7a6fSAndy Grover /* 37c9e7a6fSAndy Grover * Copyright (C) 2013 Shaohua Li <shli@kernel.org> 47c9e7a6fSAndy Grover * Copyright (C) 2014 Red Hat, Inc. 5f97ec7dbSIlias Tsitsimpis * Copyright (C) 2015 Arrikto, Inc. 6141685a3SXiubo Li * Copyright (C) 2017 Chinamobile, Inc. 77c9e7a6fSAndy Grover */ 87c9e7a6fSAndy Grover 97c9e7a6fSAndy Grover #include <linux/spinlock.h> 107c9e7a6fSAndy Grover #include <linux/module.h> 117c9e7a6fSAndy Grover #include <linux/idr.h> 12ba929992SBart Van Assche #include <linux/kernel.h> 137c9e7a6fSAndy Grover #include <linux/timer.h> 147c9e7a6fSAndy Grover #include <linux/parser.h> 155538d294SDavid S. Miller #include <linux/vmalloc.h> 167c9e7a6fSAndy Grover #include <linux/uio_driver.h> 17141685a3SXiubo Li #include <linux/radix-tree.h> 18ac64a2ceSDavid Disseldorp #include <linux/stringify.h> 1926418649SSheng Yang #include <linux/bitops.h> 20f5045724SBart Van Assche #include <linux/highmem.h> 217d7a7435SNicholas Bellinger #include <linux/configfs.h> 22b6df4b79SXiubo Li #include <linux/mutex.h> 239972cebbSMike Christie #include <linux/workqueue.h> 247c9e7a6fSAndy Grover #include <net/genetlink.h> 25ba929992SBart Van Assche #include <scsi/scsi_common.h> 26ba929992SBart Van Assche #include <scsi/scsi_proto.h> 277c9e7a6fSAndy Grover #include <target/target_core_base.h> 287c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 297c9e7a6fSAndy Grover #include <target/target_core_backend.h> 30e9f720d6SNicholas Bellinger 317c9e7a6fSAndy Grover #include <linux/target_core_user.h> 327c9e7a6fSAndy Grover 33572ccdabSRandy Dunlap /** 34572ccdabSRandy Dunlap * DOC: Userspace I/O 35572ccdabSRandy Dunlap * Userspace I/O 36572ccdabSRandy Dunlap * ------------- 37572ccdabSRandy Dunlap * 387c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 397c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 407c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 417c9e7a6fSAndy Grover * 427c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 437c9e7a6fSAndy Grover * introspection work for us. 447c9e7a6fSAndy Grover * 457c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 467c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 477c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 48572ccdabSRandy Dunlap * internal to the mmap-ed area. There is separate space outside the 497c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 507c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 517c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 527c9e7a6fSAndy Grover * 537c9e7a6fSAndy Grover * SECURITY: 547c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 557c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 567c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 577c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 587c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 597c9e7a6fSAndy Grover * this may have a 'UAM' comment. 607c9e7a6fSAndy Grover */ 617c9e7a6fSAndy Grover 627c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 637c9e7a6fSAndy Grover 64b6df4b79SXiubo Li /* For cmd area, the size is fixed 8MB */ 65b6df4b79SXiubo Li #define CMDR_SIZE (8 * 1024 * 1024) 6626418649SSheng Yang 67b6df4b79SXiubo Li /* 68b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 69b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 70b6df4b79SXiubo Li */ 71b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 7280eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 7380eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 747c9e7a6fSAndy Grover 7580eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 7680eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 7780eb8761SMike Christie 78af1dd7ffSMike Christie /* 79af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 80af1dd7ffSMike Christie * when the unmap thread will be started. 81af1dd7ffSMike Christie */ 8280eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 83b6df4b79SXiubo Li 84b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 85bdaeedc1SMike Christie static u8 tcmu_netlink_blocked; 86b3af66e2SMike Christie 877c9e7a6fSAndy Grover static struct device *tcmu_root_device; 887c9e7a6fSAndy Grover 897c9e7a6fSAndy Grover struct tcmu_hba { 907c9e7a6fSAndy Grover u32 host_id; 917c9e7a6fSAndy Grover }; 927c9e7a6fSAndy Grover 937c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 947c9e7a6fSAndy Grover 953228691fSMike Christie static DEFINE_MUTEX(tcmu_nl_cmd_mutex); 963228691fSMike Christie static LIST_HEAD(tcmu_nl_cmd_list); 973228691fSMike Christie 983228691fSMike Christie struct tcmu_dev; 993228691fSMike Christie 100b3af66e2SMike Christie struct tcmu_nl_cmd { 101b3af66e2SMike Christie /* wake up thread waiting for reply */ 102b3af66e2SMike Christie struct completion complete; 1033228691fSMike Christie struct list_head nl_list; 1043228691fSMike Christie struct tcmu_dev *udev; 105b3af66e2SMike Christie int cmd; 106b3af66e2SMike Christie int status; 107b3af66e2SMike Christie }; 108b3af66e2SMike Christie 1097c9e7a6fSAndy Grover struct tcmu_dev { 110b6df4b79SXiubo Li struct list_head node; 111f3cdbe39SMike Christie struct kref kref; 112af1dd7ffSMike Christie 1137c9e7a6fSAndy Grover struct se_device se_dev; 1147c9e7a6fSAndy Grover 1157c9e7a6fSAndy Grover char *name; 1167c9e7a6fSAndy Grover struct se_hba *hba; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1197c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 120892782caSMike Christie #define TCMU_DEV_BIT_BLOCKED 2 12159526d7aSBodo Stroesser #define TCMU_DEV_BIT_TMR_NOTIFY 3 1227c9e7a6fSAndy Grover unsigned long flags; 1237c9e7a6fSAndy Grover 1247c9e7a6fSAndy Grover struct uio_info uio_info; 1257c9e7a6fSAndy Grover 126b6df4b79SXiubo Li struct inode *inode; 127b6df4b79SXiubo Li 1287c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1290e0d7526SMike Christie uint64_t dev_size; 1307c9e7a6fSAndy Grover u32 cmdr_size; 1317c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1323d9b9555SAndy Grover /* Offset of data area from start of mb */ 13326418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1347c9e7a6fSAndy Grover size_t data_off; 1357c9e7a6fSAndy Grover size_t data_size; 13680eb8761SMike Christie uint32_t max_blocks; 13780eb8761SMike Christie size_t ring_size; 13826418649SSheng Yang 139b6df4b79SXiubo Li struct mutex cmdr_lock; 140a94a2572SXiubo Li struct list_head qfull_queue; 141bc2d214aSBodo Stroesser struct list_head tmr_queue; 1427c9e7a6fSAndy Grover 143141685a3SXiubo Li uint32_t dbi_max; 144b6df4b79SXiubo Li uint32_t dbi_thresh; 14580eb8761SMike Christie unsigned long *data_bitmap; 146141685a3SXiubo Li struct radix_tree_root data_blocks; 147141685a3SXiubo Li 1487c9e7a6fSAndy Grover struct idr commands; 1497c9e7a6fSAndy Grover 1509103575aSMike Christie struct timer_list cmd_timer; 151af980e46SMike Christie unsigned int cmd_time_out; 152a94a2572SXiubo Li struct list_head inflight_queue; 1539103575aSMike Christie 1549103575aSMike Christie struct timer_list qfull_timer; 1559103575aSMike Christie int qfull_time_out; 1569103575aSMike Christie 157488ebe4cSMike Christie struct list_head timedout_entry; 1587c9e7a6fSAndy Grover 159b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 160b3af66e2SMike Christie 1617c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 162b849b456SKenjiro Nakayama 163b849b456SKenjiro Nakayama int nl_reply_supported; 1647c9e7a6fSAndy Grover }; 1657c9e7a6fSAndy Grover 1667c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1677c9e7a6fSAndy Grover 1687c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1697c9e7a6fSAndy Grover 1707c9e7a6fSAndy Grover struct tcmu_cmd { 1717c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1727c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 173a94a2572SXiubo Li struct list_head queue_entry; 1747c9e7a6fSAndy Grover 1757c9e7a6fSAndy Grover uint16_t cmd_id; 1767c9e7a6fSAndy Grover 17726418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1787c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 179141685a3SXiubo Li uint32_t dbi_cnt; 18052ef2743SBodo Stroesser uint32_t dbi_bidi_cnt; 181141685a3SXiubo Li uint32_t dbi_cur; 182141685a3SXiubo Li uint32_t *dbi; 1837c9e7a6fSAndy Grover 1843c9a7c58SBodo Stroesser uint32_t data_len_bidi; 1853c9a7c58SBodo Stroesser 1867c9e7a6fSAndy Grover unsigned long deadline; 1877c9e7a6fSAndy Grover 1887c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1897c9e7a6fSAndy Grover unsigned long flags; 1907c9e7a6fSAndy Grover }; 191bc2d214aSBodo Stroesser 192bc2d214aSBodo Stroesser struct tcmu_tmr { 193bc2d214aSBodo Stroesser struct list_head queue_entry; 194bc2d214aSBodo Stroesser 195bc2d214aSBodo Stroesser uint8_t tmr_type; 196bc2d214aSBodo Stroesser uint32_t tmr_cmd_cnt; 197bc2d214aSBodo Stroesser int16_t tmr_cmd_ids[0]; 198bc2d214aSBodo Stroesser }; 199bc2d214aSBodo Stroesser 200af1dd7ffSMike Christie /* 201af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 202af1dd7ffSMike Christie * 203af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 204af1dd7ffSMike Christie * ... 205af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 206af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 207af1dd7ffSMike Christie * ... 208af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 209af1dd7ffSMike Christie */ 210b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 211b6df4b79SXiubo Li static LIST_HEAD(root_udev); 212b6df4b79SXiubo Li 213488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 214488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 215488ebe4cSMike Christie 21680eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 21780eb8761SMike Christie 218b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 219af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 22080eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 221b6df4b79SXiubo Li 22280eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 22380eb8761SMike Christie const struct kernel_param *kp) 22480eb8761SMike Christie { 22580eb8761SMike Christie int ret, max_area_mb; 22680eb8761SMike Christie 22780eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 22880eb8761SMike Christie if (ret) 22980eb8761SMike Christie return -EINVAL; 23080eb8761SMike Christie 23180eb8761SMike Christie if (max_area_mb <= 0) { 23280eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 23380eb8761SMike Christie return -EINVAL; 23480eb8761SMike Christie } 23580eb8761SMike Christie 23680eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 23780eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 23880eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 23980eb8761SMike Christie else 24080eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 24180eb8761SMike Christie 24280eb8761SMike Christie return 0; 24380eb8761SMike Christie } 24480eb8761SMike Christie 24580eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 24680eb8761SMike Christie const struct kernel_param *kp) 24780eb8761SMike Christie { 2486d70cb34SXiongfeng Wang return sprintf(buffer, "%d\n", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 24980eb8761SMike Christie } 25080eb8761SMike Christie 25180eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 25280eb8761SMike Christie .set = tcmu_set_global_max_data_area, 25380eb8761SMike Christie .get = tcmu_get_global_max_data_area, 25480eb8761SMike Christie }; 25580eb8761SMike Christie 25680eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 25780eb8761SMike Christie S_IWUSR | S_IRUGO); 25880eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 25980eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 26080eb8761SMike Christie "data areas."); 2617c9e7a6fSAndy Grover 262bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 263bdaeedc1SMike Christie const struct kernel_param *kp) 264bdaeedc1SMike Christie { 265bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 266bdaeedc1SMike Christie "blocked" : "unblocked"); 267bdaeedc1SMike Christie } 268bdaeedc1SMike Christie 269bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 270bdaeedc1SMike Christie const struct kernel_param *kp) 271bdaeedc1SMike Christie { 272bdaeedc1SMike Christie int ret; 273bdaeedc1SMike Christie u8 val; 274bdaeedc1SMike Christie 275bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 276bdaeedc1SMike Christie if (ret < 0) 277bdaeedc1SMike Christie return ret; 278bdaeedc1SMike Christie 279bdaeedc1SMike Christie if (val > 1) { 280bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 281bdaeedc1SMike Christie return -EINVAL; 282bdaeedc1SMike Christie } 283bdaeedc1SMike Christie 284bdaeedc1SMike Christie tcmu_netlink_blocked = val; 285bdaeedc1SMike Christie return 0; 286bdaeedc1SMike Christie } 287bdaeedc1SMike Christie 288bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 289bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 290bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 291bdaeedc1SMike Christie }; 292bdaeedc1SMike Christie 293bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 294bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 295bdaeedc1SMike Christie 296bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 297bdaeedc1SMike Christie { 298bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 299bdaeedc1SMike Christie 300bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 301bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 302bdaeedc1SMike Christie return -EBUSY; 303bdaeedc1SMike Christie } 304bdaeedc1SMike Christie 305bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 306bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 307bdaeedc1SMike Christie nl_cmd->status = -EINTR; 308bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 309bdaeedc1SMike Christie complete(&nl_cmd->complete); 310bdaeedc1SMike Christie } 311bdaeedc1SMike Christie return 0; 312bdaeedc1SMike Christie } 313bdaeedc1SMike Christie 314bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 315bdaeedc1SMike Christie const struct kernel_param *kp) 316bdaeedc1SMike Christie { 317bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 318bdaeedc1SMike Christie int ret; 319bdaeedc1SMike Christie u8 val; 320bdaeedc1SMike Christie 321bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 322bdaeedc1SMike Christie if (ret < 0) 323bdaeedc1SMike Christie return ret; 324bdaeedc1SMike Christie 325bdaeedc1SMike Christie if (val != 1) { 326bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 327bdaeedc1SMike Christie return -EINVAL; 328bdaeedc1SMike Christie } 329bdaeedc1SMike Christie 330bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 331bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 332bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 333bdaeedc1SMike Christie if (ret) 334bdaeedc1SMike Christie break; 335bdaeedc1SMike Christie } 336bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 337bdaeedc1SMike Christie 338bdaeedc1SMike Christie return ret; 339bdaeedc1SMike Christie } 340bdaeedc1SMike Christie 341bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 342bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 343bdaeedc1SMike Christie }; 344bdaeedc1SMike Christie 345bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 346bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 347bdaeedc1SMike Christie 3487c9e7a6fSAndy Grover /* multicast group */ 3497c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3507c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3517c9e7a6fSAndy Grover }; 3527c9e7a6fSAndy Grover 3537c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3547c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3557c9e7a6fSAndy Grover }; 3567c9e7a6fSAndy Grover 357b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 358b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 359b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 360b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 361b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 362b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 363b3af66e2SMike Christie }; 364b3af66e2SMike Christie 365b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 366b3af66e2SMike Christie { 3673228691fSMike Christie struct tcmu_dev *udev = NULL; 368b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 369b3af66e2SMike Christie int dev_id, rc, ret = 0; 370b3af66e2SMike Christie 371b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 372b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 373b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 374b3af66e2SMike Christie return -EINVAL; 375b3af66e2SMike Christie } 376b3af66e2SMike Christie 377b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 378b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 379b3af66e2SMike Christie 3803228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3813228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3823228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3833228691fSMike Christie udev = nl_cmd->udev; 3843228691fSMike Christie break; 385b3af66e2SMike Christie } 3863228691fSMike Christie } 387b3af66e2SMike Christie 3883228691fSMike Christie if (!udev) { 3890c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3903228691fSMike Christie completed_cmd, rc, dev_id); 3913228691fSMike Christie ret = -ENODEV; 3923228691fSMike Christie goto unlock; 3933228691fSMike Christie } 3943228691fSMike Christie list_del(&nl_cmd->nl_list); 395b3af66e2SMike Christie 396bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 397bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 398bdaeedc1SMike Christie nl_cmd->status); 399b3af66e2SMike Christie 400b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 4013228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 4023228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 403b3af66e2SMike Christie ret = -EINVAL; 4043228691fSMike Christie goto unlock; 405b3af66e2SMike Christie } 406b3af66e2SMike Christie 4073228691fSMike Christie nl_cmd->status = rc; 408b3af66e2SMike Christie complete(&nl_cmd->complete); 4093228691fSMike Christie unlock: 4103228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 411b3af66e2SMike Christie return ret; 412b3af66e2SMike Christie } 413b3af66e2SMike Christie 414b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 415b3af66e2SMike Christie { 416b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 417b3af66e2SMike Christie } 418b3af66e2SMike Christie 419b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 420b3af66e2SMike Christie { 421b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 422b3af66e2SMike Christie } 423b3af66e2SMike Christie 424b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 425b3af66e2SMike Christie struct genl_info *info) 426b3af66e2SMike Christie { 427b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 428b3af66e2SMike Christie } 429b3af66e2SMike Christie 430b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 431b3af66e2SMike Christie { 432b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 433b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 434b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 435b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 436b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 437b3af66e2SMike Christie } 438b3af66e2SMike Christie 439b3af66e2SMike Christie return 0; 440b3af66e2SMike Christie } 441b3af66e2SMike Christie 44266a9b928SJakub Kicinski static const struct genl_small_ops tcmu_genl_ops[] = { 443b3af66e2SMike Christie { 444b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 445ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 446b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 447b3af66e2SMike Christie .doit = tcmu_genl_set_features, 448b3af66e2SMike Christie }, 449b3af66e2SMike Christie { 450b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 451ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 452b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 453b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 454b3af66e2SMike Christie }, 455b3af66e2SMike Christie { 456b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 457ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 458b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 459b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 460b3af66e2SMike Christie }, 461b3af66e2SMike Christie { 462b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 463ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 464b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 465b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 466b3af66e2SMike Christie }, 467b3af66e2SMike Christie }; 468b3af66e2SMike Christie 4697c9e7a6fSAndy Grover /* Our generic netlink family */ 47056989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 471489111e5SJohannes Berg .module = THIS_MODULE, 4727c9e7a6fSAndy Grover .hdrsize = 0, 4737c9e7a6fSAndy Grover .name = "TCM-USER", 474b3af66e2SMike Christie .version = 2, 4757c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4763b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4777c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4787c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 47920c08b36SSheng Yang .netnsok = true, 48066a9b928SJakub Kicinski .small_ops = tcmu_genl_ops, 48166a9b928SJakub Kicinski .n_small_ops = ARRAY_SIZE(tcmu_genl_ops), 4827c9e7a6fSAndy Grover }; 4837c9e7a6fSAndy Grover 484141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 485141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 486141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 487141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 488141685a3SXiubo Li 489b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 490141685a3SXiubo Li { 491141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 492141685a3SXiubo Li uint32_t i; 493141685a3SXiubo Li 494b6df4b79SXiubo Li for (i = 0; i < len; i++) 495141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 496141685a3SXiubo Li } 497141685a3SXiubo Li 4987e98905eSBodo Stroesser static inline int tcmu_get_empty_block(struct tcmu_dev *udev, 4997e98905eSBodo Stroesser struct tcmu_cmd *tcmu_cmd, 5007e98905eSBodo Stroesser int prev_dbi, int *iov_cnt) 501141685a3SXiubo Li { 502b6df4b79SXiubo Li struct page *page; 503b6df4b79SXiubo Li int ret, dbi; 504141685a3SXiubo Li 505b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 506b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 5077e98905eSBodo Stroesser return -1; 508b6df4b79SXiubo Li 509b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 510b6df4b79SXiubo Li if (!page) { 511b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 51280eb8761SMike Christie tcmu_global_max_blocks) 513af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 514b6df4b79SXiubo Li 515b6df4b79SXiubo Li /* try to get new page from the mm */ 5160eccce86SDamien Le Moal page = alloc_page(GFP_NOIO); 517b6df4b79SXiubo Li if (!page) 518daf78c30SXiubo Li goto err_alloc; 519b6df4b79SXiubo Li 520b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 521daf78c30SXiubo Li if (ret) 522daf78c30SXiubo Li goto err_insert; 523b6df4b79SXiubo Li } 524b6df4b79SXiubo Li 525141685a3SXiubo Li if (dbi > udev->dbi_max) 526141685a3SXiubo Li udev->dbi_max = dbi; 527141685a3SXiubo Li 528141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 529b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 530141685a3SXiubo Li 5317e98905eSBodo Stroesser if (dbi != prev_dbi + 1) 5327e98905eSBodo Stroesser *iov_cnt += 1; 5337e98905eSBodo Stroesser 5347e98905eSBodo Stroesser return dbi; 535daf78c30SXiubo Li err_insert: 536daf78c30SXiubo Li __free_page(page); 537daf78c30SXiubo Li err_alloc: 538daf78c30SXiubo Li atomic_dec(&global_db_count); 5397e98905eSBodo Stroesser return -1; 540141685a3SXiubo Li } 541141685a3SXiubo Li 5427e98905eSBodo Stroesser static int tcmu_get_empty_blocks(struct tcmu_dev *udev, 5437e98905eSBodo Stroesser struct tcmu_cmd *tcmu_cmd, int dbi_cnt) 544b6df4b79SXiubo Li { 5457e98905eSBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 5467e98905eSBodo Stroesser int dbi = -2; 5477e98905eSBodo Stroesser int i, iov_cnt = 0; 548b6df4b79SXiubo Li 5497e98905eSBodo Stroesser for (i = 0; i < dbi_cnt; i++) { 5507e98905eSBodo Stroesser dbi = tcmu_get_empty_block(udev, tcmu_cmd, dbi, &iov_cnt); 5517e98905eSBodo Stroesser if (dbi < 0) 5527e98905eSBodo Stroesser return -1; 553141685a3SXiubo Li } 5547e98905eSBodo Stroesser return iov_cnt; 555141685a3SXiubo Li } 556141685a3SXiubo Li 557b6df4b79SXiubo Li static inline struct page * 558b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 559141685a3SXiubo Li { 560141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 561141685a3SXiubo Li } 562141685a3SXiubo Li 563141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 564141685a3SXiubo Li { 565a3512902SBodo Stroesser if (tcmu_cmd->se_cmd) 566a3512902SBodo Stroesser tcmu_cmd->se_cmd->priv = NULL; 567141685a3SXiubo Li kfree(tcmu_cmd->dbi); 568141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 569141685a3SXiubo Li } 570141685a3SXiubo Li 57152ef2743SBodo Stroesser static inline void tcmu_cmd_set_block_cnts(struct tcmu_cmd *cmd) 572141685a3SXiubo Li { 57352ef2743SBodo Stroesser int i, len; 57452ef2743SBodo Stroesser struct se_cmd *se_cmd = cmd->se_cmd; 57552ef2743SBodo Stroesser 57652ef2743SBodo Stroesser cmd->dbi_cnt = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 577141685a3SXiubo Li 578141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 579141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 58052ef2743SBodo Stroesser for (i = 0, len = 0; i < se_cmd->t_bidi_data_nents; i++) 58152ef2743SBodo Stroesser len += se_cmd->t_bidi_data_sg[i].length; 58252ef2743SBodo Stroesser cmd->dbi_bidi_cnt = DIV_ROUND_UP(len, DATA_BLOCK_SIZE); 58352ef2743SBodo Stroesser cmd->dbi_cnt += cmd->dbi_bidi_cnt; 5843c9a7c58SBodo Stroesser cmd->data_len_bidi = len; 585141685a3SXiubo Li } 586141685a3SXiubo Li } 587141685a3SXiubo Li 5883c9a7c58SBodo Stroesser static int new_block_to_iov(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 589*c8ed1ff8SBodo Stroesser struct iovec **iov, int prev_dbi, int len) 5903c9a7c58SBodo Stroesser { 5913c9a7c58SBodo Stroesser /* Get the next dbi */ 5923c9a7c58SBodo Stroesser int dbi = tcmu_cmd_get_dbi(cmd); 5933c9a7c58SBodo Stroesser 594*c8ed1ff8SBodo Stroesser /* Do not add more than DATA_BLOCK_SIZE to iov */ 595*c8ed1ff8SBodo Stroesser if (len > DATA_BLOCK_SIZE) 596*c8ed1ff8SBodo Stroesser len = DATA_BLOCK_SIZE; 597*c8ed1ff8SBodo Stroesser 5983c9a7c58SBodo Stroesser /* 5993c9a7c58SBodo Stroesser * The following code will gather and map the blocks to the same iovec 6003c9a7c58SBodo Stroesser * when the blocks are all next to each other. 6013c9a7c58SBodo Stroesser */ 6023c9a7c58SBodo Stroesser if (dbi != prev_dbi + 1) { 6033c9a7c58SBodo Stroesser /* dbi is not next to previous dbi, so start new iov */ 6043c9a7c58SBodo Stroesser if (prev_dbi >= 0) 6053c9a7c58SBodo Stroesser (*iov)++; 6063c9a7c58SBodo Stroesser /* write offset relative to mb_addr */ 6073c9a7c58SBodo Stroesser (*iov)->iov_base = (void __user *) 6083c9a7c58SBodo Stroesser (udev->data_off + dbi * DATA_BLOCK_SIZE); 6093c9a7c58SBodo Stroesser } 6103c9a7c58SBodo Stroesser (*iov)->iov_len += len; 6113c9a7c58SBodo Stroesser 6123c9a7c58SBodo Stroesser return dbi; 6133c9a7c58SBodo Stroesser } 6143c9a7c58SBodo Stroesser 6153c9a7c58SBodo Stroesser static void tcmu_setup_iovs(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 6163c9a7c58SBodo Stroesser struct iovec **iov, int data_length) 6173c9a7c58SBodo Stroesser { 6183c9a7c58SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 6193c9a7c58SBodo Stroesser int dbi = -2; 6203c9a7c58SBodo Stroesser 6213c9a7c58SBodo Stroesser /* We prepare the IOVs for DMA_FROM_DEVICE transfer direction */ 622*c8ed1ff8SBodo Stroesser for (; data_length > 0; data_length -= DATA_BLOCK_SIZE) 623*c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, cmd, iov, dbi, data_length); 6243c9a7c58SBodo Stroesser } 6253c9a7c58SBodo Stroesser 6267c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 6277c9e7a6fSAndy Grover { 6287c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 6297c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 6307c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 6317c9e7a6fSAndy Grover 6320eccce86SDamien Le Moal tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); 6337c9e7a6fSAndy Grover if (!tcmu_cmd) 6347c9e7a6fSAndy Grover return NULL; 6357c9e7a6fSAndy Grover 636a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 6377c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 6387c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 6397c9e7a6fSAndy Grover 64052ef2743SBodo Stroesser tcmu_cmd_set_block_cnts(tcmu_cmd); 641141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 6420eccce86SDamien Le Moal GFP_NOIO); 643141685a3SXiubo Li if (!tcmu_cmd->dbi) { 644141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 645141685a3SXiubo Li return NULL; 646141685a3SXiubo Li } 647141685a3SXiubo Li 6487c9e7a6fSAndy Grover return tcmu_cmd; 6497c9e7a6fSAndy Grover } 6507c9e7a6fSAndy Grover 6517c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 6527c9e7a6fSAndy Grover { 653b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 65426d2b310Stangwenji void *start = vaddr - offset; 6557c9e7a6fSAndy Grover 6567c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6577c9e7a6fSAndy Grover 6587c9e7a6fSAndy Grover while (size) { 6593145550aSBodo Stroesser flush_dcache_page(vmalloc_to_page(start)); 66026d2b310Stangwenji start += PAGE_SIZE; 6617c9e7a6fSAndy Grover size -= PAGE_SIZE; 6627c9e7a6fSAndy Grover } 6637c9e7a6fSAndy Grover } 6647c9e7a6fSAndy Grover 6657c9e7a6fSAndy Grover /* 6667c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6677c9e7a6fSAndy Grover * we can't use circ_buf.h. 6687c9e7a6fSAndy Grover */ 6697c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6707c9e7a6fSAndy Grover { 6717c9e7a6fSAndy Grover int diff = head - tail; 6727c9e7a6fSAndy Grover 6737c9e7a6fSAndy Grover if (diff >= 0) 6747c9e7a6fSAndy Grover return diff; 6757c9e7a6fSAndy Grover else 6767c9e7a6fSAndy Grover return size + diff; 6777c9e7a6fSAndy Grover } 6787c9e7a6fSAndy Grover 6797c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6807c9e7a6fSAndy Grover { 6817c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6827c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6837c9e7a6fSAndy Grover } 6847c9e7a6fSAndy Grover 6857c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6867c9e7a6fSAndy Grover { 6877c9e7a6fSAndy Grover return size - head; 6887c9e7a6fSAndy Grover } 6897c9e7a6fSAndy Grover 6907c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6917c9e7a6fSAndy Grover 692*c8ed1ff8SBodo Stroesser #define TCMU_SG_TO_DATA_AREA 1 693*c8ed1ff8SBodo Stroesser #define TCMU_DATA_AREA_TO_SG 2 694*c8ed1ff8SBodo Stroesser 695*c8ed1ff8SBodo Stroesser static inline void tcmu_copy_data(struct tcmu_dev *udev, 696*c8ed1ff8SBodo Stroesser struct tcmu_cmd *tcmu_cmd, uint32_t direction, 697*c8ed1ff8SBodo Stroesser struct scatterlist *sg, unsigned int sg_nents, 698*c8ed1ff8SBodo Stroesser struct iovec **iov, size_t data_len) 699*c8ed1ff8SBodo Stroesser { 700*c8ed1ff8SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 701*c8ed1ff8SBodo Stroesser int dbi = -2; 702*c8ed1ff8SBodo Stroesser size_t block_remaining, cp_len; 703*c8ed1ff8SBodo Stroesser struct sg_mapping_iter sg_iter; 704*c8ed1ff8SBodo Stroesser unsigned int sg_flags; 705*c8ed1ff8SBodo Stroesser struct page *page; 706*c8ed1ff8SBodo Stroesser void *data_page_start, *data_addr; 707*c8ed1ff8SBodo Stroesser 708*c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 709*c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_FROM_SG; 710*c8ed1ff8SBodo Stroesser else 711*c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; 712*c8ed1ff8SBodo Stroesser sg_miter_start(&sg_iter, sg, sg_nents, sg_flags); 713*c8ed1ff8SBodo Stroesser 714*c8ed1ff8SBodo Stroesser while (data_len) { 715*c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 716*c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, tcmu_cmd, iov, dbi, 717*c8ed1ff8SBodo Stroesser data_len); 718*c8ed1ff8SBodo Stroesser else 719*c8ed1ff8SBodo Stroesser dbi = tcmu_cmd_get_dbi(tcmu_cmd); 720*c8ed1ff8SBodo Stroesser page = tcmu_get_block_page(udev, dbi); 721*c8ed1ff8SBodo Stroesser if (direction == TCMU_DATA_AREA_TO_SG) 722*c8ed1ff8SBodo Stroesser flush_dcache_page(page); 723*c8ed1ff8SBodo Stroesser data_page_start = kmap_atomic(page); 724*c8ed1ff8SBodo Stroesser block_remaining = DATA_BLOCK_SIZE; 725*c8ed1ff8SBodo Stroesser 726*c8ed1ff8SBodo Stroesser while (block_remaining && data_len) { 727*c8ed1ff8SBodo Stroesser if (!sg_miter_next(&sg_iter)) { 728*c8ed1ff8SBodo Stroesser /* set length to 0 to abort outer loop */ 729*c8ed1ff8SBodo Stroesser data_len = 0; 730*c8ed1ff8SBodo Stroesser pr_debug("tcmu_move_data: aborting data copy due to exhausted sg_list\n"); 731*c8ed1ff8SBodo Stroesser break; 732*c8ed1ff8SBodo Stroesser } 733*c8ed1ff8SBodo Stroesser cp_len = min3(sg_iter.length, block_remaining, data_len); 734*c8ed1ff8SBodo Stroesser 735*c8ed1ff8SBodo Stroesser data_addr = data_page_start + 736*c8ed1ff8SBodo Stroesser DATA_BLOCK_SIZE - block_remaining; 737*c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 738*c8ed1ff8SBodo Stroesser memcpy(data_addr, sg_iter.addr, cp_len); 739*c8ed1ff8SBodo Stroesser else 740*c8ed1ff8SBodo Stroesser memcpy(sg_iter.addr, data_addr, cp_len); 741*c8ed1ff8SBodo Stroesser 742*c8ed1ff8SBodo Stroesser data_len -= cp_len; 743*c8ed1ff8SBodo Stroesser block_remaining -= cp_len; 744*c8ed1ff8SBodo Stroesser sg_iter.consumed = cp_len; 745*c8ed1ff8SBodo Stroesser } 746*c8ed1ff8SBodo Stroesser sg_miter_stop(&sg_iter); 747*c8ed1ff8SBodo Stroesser 748*c8ed1ff8SBodo Stroesser kunmap_atomic(data_page_start); 749*c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 750*c8ed1ff8SBodo Stroesser flush_dcache_page(page); 751*c8ed1ff8SBodo Stroesser } 752*c8ed1ff8SBodo Stroesser } 753*c8ed1ff8SBodo Stroesser 7543c9a7c58SBodo Stroesser static void scatter_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7553c9a7c58SBodo Stroesser struct iovec **iov) 75626418649SSheng Yang { 7573c9a7c58SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 758f97ec7dbSIlias Tsitsimpis 759*c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_SG_TO_DATA_AREA, se_cmd->t_data_sg, 760*c8ed1ff8SBodo Stroesser se_cmd->t_data_nents, iov, se_cmd->data_length); 7613c58f737SBodo Stroesser } 762b6df4b79SXiubo Li 763*c8ed1ff8SBodo Stroesser static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7646c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 765f97ec7dbSIlias Tsitsimpis { 766*c8ed1ff8SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 767*c8ed1ff8SBodo Stroesser struct scatterlist *data_sg; 768a5d68ba8SXiubo Li unsigned int data_nents; 769a5d68ba8SXiubo Li 770a5d68ba8SXiubo Li if (!bidi) { 771a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 772a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 773a5d68ba8SXiubo Li } else { 774a5d68ba8SXiubo Li /* 775a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 776a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 77752ef2743SBodo Stroesser * the Data-Out buffer blocks should be skipped. 778a5d68ba8SXiubo Li */ 779*c8ed1ff8SBodo Stroesser tcmu_cmd_set_dbi_cur(tcmu_cmd, 780*c8ed1ff8SBodo Stroesser tcmu_cmd->dbi_cnt - tcmu_cmd->dbi_bidi_cnt); 781a5d68ba8SXiubo Li 782a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 783a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 784a5d68ba8SXiubo Li } 785f97ec7dbSIlias Tsitsimpis 786*c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_DATA_AREA_TO_SG, data_sg, 787*c8ed1ff8SBodo Stroesser data_nents, NULL, read_len); 788f97ec7dbSIlias Tsitsimpis } 789f97ec7dbSIlias Tsitsimpis 790b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 79126418649SSheng Yang { 7923c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 79326418649SSheng Yang } 79426418649SSheng Yang 7957c9e7a6fSAndy Grover /* 7967e98905eSBodo Stroesser * We can't queue a command until we have space available on the cmd ring. 7977c9e7a6fSAndy Grover * 7987c9e7a6fSAndy Grover * Called with ring lock held. 7997c9e7a6fSAndy Grover */ 8007e98905eSBodo Stroesser static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size) 8017c9e7a6fSAndy Grover { 8027c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 8030241fd39SNicholas Bellinger size_t space, cmd_needed; 8047c9e7a6fSAndy Grover u32 cmd_head; 8057c9e7a6fSAndy Grover 8067c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8077c9e7a6fSAndy Grover 8087c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8097c9e7a6fSAndy Grover 810f56574a2SAndy Grover /* 811f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 812f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 813f56574a2SAndy Grover */ 814f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 815f56574a2SAndy Grover cmd_needed = cmd_size; 816f56574a2SAndy Grover else 817f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 818f56574a2SAndy Grover 8197c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8207c9e7a6fSAndy Grover if (space < cmd_needed) { 8217c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8227c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8237c9e7a6fSAndy Grover return false; 8247c9e7a6fSAndy Grover } 825bc2d214aSBodo Stroesser return true; 8267e98905eSBodo Stroesser } 8277e98905eSBodo Stroesser 8287e98905eSBodo Stroesser /* 8297e98905eSBodo Stroesser * We have to allocate data buffers before we can queue a command. 8307e98905eSBodo Stroesser * Returns -1 on error (not enough space) or number of needed iovs on success 8317e98905eSBodo Stroesser * 8327e98905eSBodo Stroesser * Called with ring lock held. 8337e98905eSBodo Stroesser */ 8347e98905eSBodo Stroesser static int tcmu_alloc_data_space(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 8357e98905eSBodo Stroesser int *iov_bidi_cnt) 8367e98905eSBodo Stroesser { 8377e98905eSBodo Stroesser int space, iov_cnt = 0, ret = 0; 8387e98905eSBodo Stroesser 8397e98905eSBodo Stroesser if (!cmd->dbi_cnt) 8407e98905eSBodo Stroesser goto wr_iov_cnts; 841bc2d214aSBodo Stroesser 842b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 843b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 84452ef2743SBodo Stroesser if (space < cmd->dbi_cnt) { 84580eb8761SMike Christie unsigned long blocks_left = 84680eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 847b6df4b79SXiubo Li 84852ef2743SBodo Stroesser if (blocks_left < cmd->dbi_cnt) { 8497e98905eSBodo Stroesser pr_debug("no data space: only %lu available, but ask for %lu\n", 850b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 85152ef2743SBodo Stroesser cmd->dbi_cnt * DATA_BLOCK_SIZE); 8527e98905eSBodo Stroesser return -1; 8537c9e7a6fSAndy Grover } 8547c9e7a6fSAndy Grover 85552ef2743SBodo Stroesser udev->dbi_thresh += cmd->dbi_cnt; 85680eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 85780eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 858b6df4b79SXiubo Li } 859b6df4b79SXiubo Li 8607e98905eSBodo Stroesser iov_cnt = tcmu_get_empty_blocks(udev, cmd, 8617e98905eSBodo Stroesser cmd->dbi_cnt - cmd->dbi_bidi_cnt); 8627e98905eSBodo Stroesser if (iov_cnt < 0) 8637e98905eSBodo Stroesser return -1; 8647e98905eSBodo Stroesser 8657e98905eSBodo Stroesser if (cmd->dbi_bidi_cnt) { 8667e98905eSBodo Stroesser ret = tcmu_get_empty_blocks(udev, cmd, cmd->dbi_bidi_cnt); 8677e98905eSBodo Stroesser if (ret < 0) 8687e98905eSBodo Stroesser return -1; 8697e98905eSBodo Stroesser } 8707e98905eSBodo Stroesser wr_iov_cnts: 8717e98905eSBodo Stroesser *iov_bidi_cnt = ret; 8727e98905eSBodo Stroesser return iov_cnt + ret; 8737c9e7a6fSAndy Grover } 8747c9e7a6fSAndy Grover 875fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 876fe25cc34SXiubo Li { 877fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 878fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 879fe25cc34SXiubo Li } 880fe25cc34SXiubo Li 881fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 882fe25cc34SXiubo Li size_t base_command_size) 883fe25cc34SXiubo Li { 884fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 885fe25cc34SXiubo Li size_t command_size; 886fe25cc34SXiubo Li 887fe25cc34SXiubo Li command_size = base_command_size + 888fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 889fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 890fe25cc34SXiubo Li 891fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 892fe25cc34SXiubo Li 893fe25cc34SXiubo Li return command_size; 894fe25cc34SXiubo Li } 895fe25cc34SXiubo Li 89661fb2482SBodo Stroesser static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8979103575aSMike Christie struct timer_list *timer) 8980d44374cSMike Christie { 8999103575aSMike Christie if (!tmo) 90061fb2482SBodo Stroesser return; 9019103575aSMike Christie 9020d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 903a94a2572SXiubo Li if (!timer_pending(timer)) 9049103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 905a94a2572SXiubo Li 90661fb2482SBodo Stroesser pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, 90761fb2482SBodo Stroesser tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); 9080d44374cSMike Christie } 9090d44374cSMike Christie 910a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 911af1dd7ffSMike Christie { 912af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9139103575aSMike Christie unsigned int tmo; 914af1dd7ffSMike Christie 9159103575aSMike Christie /* 9169103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9179103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9189103575aSMike Christie */ 9199103575aSMike Christie if (!udev->qfull_time_out) 9209103575aSMike Christie return -ETIMEDOUT; 9219103575aSMike Christie else if (udev->qfull_time_out > 0) 9229103575aSMike Christie tmo = udev->qfull_time_out; 9239103575aSMike Christie else if (udev->cmd_time_out) 9249103575aSMike Christie tmo = udev->cmd_time_out; 9259103575aSMike Christie else 9269103575aSMike Christie tmo = TCMU_TIME_OUT; 9279103575aSMike Christie 92861fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 929af1dd7ffSMike Christie 930a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 93161fb2482SBodo Stroesser pr_debug("adding cmd %p on dev %s to ring space wait queue\n", 93261fb2482SBodo Stroesser tcmu_cmd, udev->name); 933af1dd7ffSMike Christie return 0; 934af1dd7ffSMike Christie } 935af1dd7ffSMike Christie 9363d3f9d56SBodo Stroesser static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) 9373d3f9d56SBodo Stroesser { 9383d3f9d56SBodo Stroesser struct tcmu_cmd_entry_hdr *hdr; 9393d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 9403d3f9d56SBodo Stroesser uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9413d3f9d56SBodo Stroesser 9423d3f9d56SBodo Stroesser /* Insert a PAD if end-of-ring space is too small */ 9433d3f9d56SBodo Stroesser if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { 9443d3f9d56SBodo Stroesser size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 9453d3f9d56SBodo Stroesser 9463d3f9d56SBodo Stroesser hdr = (void *) mb + CMDR_OFF + cmd_head; 9473d3f9d56SBodo Stroesser tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); 9483d3f9d56SBodo Stroesser tcmu_hdr_set_len(&hdr->len_op, pad_size); 9493d3f9d56SBodo Stroesser hdr->cmd_id = 0; /* not used for PAD */ 9503d3f9d56SBodo Stroesser hdr->kflags = 0; 9513d3f9d56SBodo Stroesser hdr->uflags = 0; 9523d3f9d56SBodo Stroesser tcmu_flush_dcache_range(hdr, sizeof(*hdr)); 9533d3f9d56SBodo Stroesser 9543d3f9d56SBodo Stroesser UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 9553d3f9d56SBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 9563d3f9d56SBodo Stroesser 9573d3f9d56SBodo Stroesser cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9583d3f9d56SBodo Stroesser WARN_ON(cmd_head != 0); 9593d3f9d56SBodo Stroesser } 9603d3f9d56SBodo Stroesser 9613d3f9d56SBodo Stroesser return cmd_head; 9623d3f9d56SBodo Stroesser } 9633d3f9d56SBodo Stroesser 9646fd0ce79SMike Christie /** 9656fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9666fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9676fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9686fd0ce79SMike Christie * 9696fd0ce79SMike Christie * Returns: 9706fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9716fd0ce79SMike Christie * 0 success 972af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9736fd0ce79SMike Christie */ 974e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9757c9e7a6fSAndy Grover { 9767c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9777c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9787c9e7a6fSAndy Grover size_t base_command_size, command_size; 9793d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 9807c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 9817c9e7a6fSAndy Grover struct iovec *iov; 9827e98905eSBodo Stroesser int iov_cnt, iov_bidi_cnt, cmd_id; 9837c9e7a6fSAndy Grover uint32_t cmd_head; 9847c9e7a6fSAndy Grover uint64_t cdb_off; 98552ef2743SBodo Stroesser /* size of data buffer needed */ 98652ef2743SBodo Stroesser size_t data_length = (size_t)tcmu_cmd->dbi_cnt * DATA_BLOCK_SIZE; 9877c9e7a6fSAndy Grover 9886fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 9896fd0ce79SMike Christie 990892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 991892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 992892782caSMike Christie return -1; 993892782caSMike Christie } 994892782caSMike Christie 9956fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 9966fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 9976fd0ce79SMike Christie return -1; 9986fd0ce79SMike Christie } 9997c9e7a6fSAndy Grover 1000a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 1001af1dd7ffSMike Christie goto queue; 10027c9e7a6fSAndy Grover 10037e98905eSBodo Stroesser if (data_length > udev->data_size) { 10047e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %zu data area\n", 10057e98905eSBodo Stroesser data_length, udev->data_size); 10066fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 10076fd0ce79SMike Christie return -1; 1008554617b2SAndy Grover } 10097c9e7a6fSAndy Grover 10107e98905eSBodo Stroesser iov_cnt = tcmu_alloc_data_space(udev, tcmu_cmd, &iov_bidi_cnt); 10117e98905eSBodo Stroesser if (iov_cnt < 0) 10127e98905eSBodo Stroesser goto free_and_queue; 10137e98905eSBodo Stroesser 10147e98905eSBodo Stroesser /* 10157e98905eSBodo Stroesser * Must be a certain minimum size for response sense info, but 10167e98905eSBodo Stroesser * also may be larger if the iov array is large. 10177e98905eSBodo Stroesser */ 10187e98905eSBodo Stroesser base_command_size = tcmu_cmd_get_base_cmd_size(iov_cnt); 10197e98905eSBodo Stroesser command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 10207e98905eSBodo Stroesser 10217e98905eSBodo Stroesser if (command_size > (udev->cmdr_size / 2)) { 10227e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %u cmd ring\n", 10237e98905eSBodo Stroesser command_size, udev->cmdr_size); 10247e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 10257e98905eSBodo Stroesser *scsi_err = TCM_INVALID_CDB_FIELD; 10267e98905eSBodo Stroesser return -1; 10277e98905eSBodo Stroesser } 10287e98905eSBodo Stroesser 10297e98905eSBodo Stroesser if (!is_ring_space_avail(udev, command_size)) 1030810b8153SMike Christie /* 1031810b8153SMike Christie * Don't leave commands partially setup because the unmap 1032810b8153SMike Christie * thread might need the blocks to make forward progress. 1033810b8153SMike Christie */ 10347e98905eSBodo Stroesser goto free_and_queue; 103526418649SSheng Yang 103661fb2482SBodo Stroesser cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 103761fb2482SBodo Stroesser if (cmd_id < 0) { 103861fb2482SBodo Stroesser pr_err("tcmu: Could not allocate cmd id.\n"); 10396fd0ce79SMike Christie 104061fb2482SBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10416fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10426fd0ce79SMike Christie return -1; 10430d44374cSMike Christie } 104461fb2482SBodo Stroesser tcmu_cmd->cmd_id = cmd_id; 104561fb2482SBodo Stroesser 104661fb2482SBodo Stroesser pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, 104761fb2482SBodo Stroesser tcmu_cmd, udev->name); 104861fb2482SBodo Stroesser 10497e98905eSBodo Stroesser cmd_head = ring_insert_padding(udev, command_size); 10507e98905eSBodo Stroesser 10517e98905eSBodo Stroesser entry = (void *) mb + CMDR_OFF + cmd_head; 10527e98905eSBodo Stroesser memset(entry, 0, command_size); 10537e98905eSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10547e98905eSBodo Stroesser 10557e98905eSBodo Stroesser /* prepare iov list and copy data to data area if necessary */ 10567e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10577e98905eSBodo Stroesser iov = &entry->req.iov[0]; 10583c9a7c58SBodo Stroesser 10593c9a7c58SBodo Stroesser if (se_cmd->data_direction == DMA_TO_DEVICE || 10603c9a7c58SBodo Stroesser se_cmd->se_cmd_flags & SCF_BIDI) 10613c9a7c58SBodo Stroesser scatter_data_area(udev, tcmu_cmd, &iov); 10623c9a7c58SBodo Stroesser else 10633c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, se_cmd->data_length); 10643c9a7c58SBodo Stroesser 10657e98905eSBodo Stroesser entry->req.iov_cnt = iov_cnt - iov_bidi_cnt; 10667e98905eSBodo Stroesser 10677e98905eSBodo Stroesser /* Handle BIDI commands */ 10687e98905eSBodo Stroesser if (se_cmd->se_cmd_flags & SCF_BIDI) { 10697e98905eSBodo Stroesser iov++; 10703c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, tcmu_cmd->data_len_bidi); 10717e98905eSBodo Stroesser entry->req.iov_bidi_cnt = iov_bidi_cnt; 10727e98905eSBodo Stroesser } 10737e98905eSBodo Stroesser 107461fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); 107561fb2482SBodo Stroesser 10760d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10770d44374cSMike Christie 1078fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1079fe25cc34SXiubo Li 10807c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 10817c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 10827c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 10837c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 10848c4e0f21SBodo Stroesser tcmu_flush_dcache_range(entry, command_size); 10857c9e7a6fSAndy Grover 10867c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 10877c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10887c9e7a6fSAndy Grover 1089a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1090a94a2572SXiubo Li 10917c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 10927c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 10937c9e7a6fSAndy Grover 10946fd0ce79SMike Christie return 0; 1095af1dd7ffSMike Christie 10967e98905eSBodo Stroesser free_and_queue: 10977e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 10987e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10997e98905eSBodo Stroesser 1100af1dd7ffSMike Christie queue: 1101a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1102af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1103af1dd7ffSMike Christie return -1; 1104af1dd7ffSMike Christie } 1105af1dd7ffSMike Christie 1106af1dd7ffSMike Christie return 1; 11077c9e7a6fSAndy Grover } 11087c9e7a6fSAndy Grover 1109bc2d214aSBodo Stroesser /** 1110bc2d214aSBodo Stroesser * queue_tmr_ring - queue tmr info to ring or internally 1111bc2d214aSBodo Stroesser * @udev: related tcmu_dev 1112bc2d214aSBodo Stroesser * @tmr: tcmu_tmr containing tmr info to queue 1113bc2d214aSBodo Stroesser * 1114bc2d214aSBodo Stroesser * Returns: 1115bc2d214aSBodo Stroesser * 0 success 1116bc2d214aSBodo Stroesser * 1 internally queued to wait for ring memory to free. 1117bc2d214aSBodo Stroesser */ 1118bc2d214aSBodo Stroesser static int 1119bc2d214aSBodo Stroesser queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) 1120bc2d214aSBodo Stroesser { 1121bc2d214aSBodo Stroesser struct tcmu_tmr_entry *entry; 1122bc2d214aSBodo Stroesser int cmd_size; 1123bc2d214aSBodo Stroesser int id_list_sz; 1124bc2d214aSBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 1125bc2d214aSBodo Stroesser uint32_t cmd_head; 1126bc2d214aSBodo Stroesser 1127bc2d214aSBodo Stroesser if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 1128bc2d214aSBodo Stroesser goto out_free; 1129bc2d214aSBodo Stroesser 1130bc2d214aSBodo Stroesser id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; 1131bc2d214aSBodo Stroesser cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); 1132bc2d214aSBodo Stroesser 1133bc2d214aSBodo Stroesser if (!list_empty(&udev->tmr_queue) || 11347e98905eSBodo Stroesser !is_ring_space_avail(udev, cmd_size)) { 1135bc2d214aSBodo Stroesser list_add_tail(&tmr->queue_entry, &udev->tmr_queue); 1136bc2d214aSBodo Stroesser pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", 1137bc2d214aSBodo Stroesser tmr, udev->name); 1138bc2d214aSBodo Stroesser return 1; 1139bc2d214aSBodo Stroesser } 1140bc2d214aSBodo Stroesser 1141bc2d214aSBodo Stroesser cmd_head = ring_insert_padding(udev, cmd_size); 1142bc2d214aSBodo Stroesser 1143bc2d214aSBodo Stroesser entry = (void *)mb + CMDR_OFF + cmd_head; 1144bc2d214aSBodo Stroesser memset(entry, 0, cmd_size); 1145bc2d214aSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); 1146bc2d214aSBodo Stroesser tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); 1147bc2d214aSBodo Stroesser entry->tmr_type = tmr->tmr_type; 1148bc2d214aSBodo Stroesser entry->cmd_cnt = tmr->tmr_cmd_cnt; 1149bc2d214aSBodo Stroesser memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); 1150bc2d214aSBodo Stroesser tcmu_flush_dcache_range(entry, cmd_size); 1151bc2d214aSBodo Stroesser 1152bc2d214aSBodo Stroesser UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); 1153bc2d214aSBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 1154bc2d214aSBodo Stroesser 1155bc2d214aSBodo Stroesser uio_event_notify(&udev->uio_info); 1156bc2d214aSBodo Stroesser 1157bc2d214aSBodo Stroesser out_free: 1158bc2d214aSBodo Stroesser kfree(tmr); 1159bc2d214aSBodo Stroesser 1160bc2d214aSBodo Stroesser return 0; 1161bc2d214aSBodo Stroesser } 1162bc2d214aSBodo Stroesser 116302eb924fSAndy Grover static sense_reason_t 116402eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11657c9e7a6fSAndy Grover { 1166af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1167af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11687c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1169c9684927SBodo Stroesser sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; 1170c9684927SBodo Stroesser int ret = -1; 11717c9e7a6fSAndy Grover 11727c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11737c9e7a6fSAndy Grover if (!tcmu_cmd) 117402eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11757c9e7a6fSAndy Grover 1176af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1177a3512902SBodo Stroesser se_cmd->priv = tcmu_cmd; 1178c9684927SBodo Stroesser if (!(se_cmd->transport_state & CMD_T_ABORTED)) 1179af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1180af1dd7ffSMike Christie if (ret < 0) 1181141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 1182a3512902SBodo Stroesser mutex_unlock(&udev->cmdr_lock); 11836fd0ce79SMike Christie return scsi_ret; 11847c9e7a6fSAndy Grover } 11857c9e7a6fSAndy Grover 1186ed212ca8SBodo Stroesser static void tcmu_set_next_deadline(struct list_head *queue, 1187ed212ca8SBodo Stroesser struct timer_list *timer) 1188ed212ca8SBodo Stroesser { 1189ed212ca8SBodo Stroesser struct tcmu_cmd *cmd; 1190ed212ca8SBodo Stroesser 1191ed212ca8SBodo Stroesser if (!list_empty(queue)) { 1192ed212ca8SBodo Stroesser cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); 1193ed212ca8SBodo Stroesser mod_timer(timer, cmd->deadline); 1194ed212ca8SBodo Stroesser } else 1195ed212ca8SBodo Stroesser del_timer(timer); 1196ed212ca8SBodo Stroesser } 1197ed212ca8SBodo Stroesser 1198bc2d214aSBodo Stroesser static int 1199bc2d214aSBodo Stroesser tcmu_tmr_type(enum tcm_tmreq_table tmf) 1200bc2d214aSBodo Stroesser { 1201bc2d214aSBodo Stroesser switch (tmf) { 1202bc2d214aSBodo Stroesser case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; 1203bc2d214aSBodo Stroesser case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; 1204bc2d214aSBodo Stroesser case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; 1205bc2d214aSBodo Stroesser case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; 1206bc2d214aSBodo Stroesser case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; 1207bc2d214aSBodo Stroesser case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; 1208bc2d214aSBodo Stroesser case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; 1209bc2d214aSBodo Stroesser case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; 1210bc2d214aSBodo Stroesser default: return TCMU_TMR_UNKNOWN; 1211bc2d214aSBodo Stroesser } 1212bc2d214aSBodo Stroesser } 1213bc2d214aSBodo Stroesser 1214bc2d214aSBodo Stroesser static void 1215bc2d214aSBodo Stroesser tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, 1216bc2d214aSBodo Stroesser struct list_head *cmd_list) 1217bc2d214aSBodo Stroesser { 1218bc2d214aSBodo Stroesser int i = 0, cmd_cnt = 0; 1219bc2d214aSBodo Stroesser bool unqueued = false; 1220bc2d214aSBodo Stroesser uint16_t *cmd_ids = NULL; 1221bc2d214aSBodo Stroesser struct tcmu_cmd *cmd; 1222bc2d214aSBodo Stroesser struct se_cmd *se_cmd; 1223bc2d214aSBodo Stroesser struct tcmu_tmr *tmr; 1224bc2d214aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(se_dev); 1225bc2d214aSBodo Stroesser 1226bc2d214aSBodo Stroesser mutex_lock(&udev->cmdr_lock); 1227bc2d214aSBodo Stroesser 1228bc2d214aSBodo Stroesser /* First we check for aborted commands in qfull_queue */ 1229bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1230bc2d214aSBodo Stroesser i++; 1231bc2d214aSBodo Stroesser if (!se_cmd->priv) 1232bc2d214aSBodo Stroesser continue; 1233bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1234bc2d214aSBodo Stroesser /* Commands on qfull queue have no id yet */ 1235bc2d214aSBodo Stroesser if (cmd->cmd_id) { 1236bc2d214aSBodo Stroesser cmd_cnt++; 1237bc2d214aSBodo Stroesser continue; 1238bc2d214aSBodo Stroesser } 1239bc2d214aSBodo Stroesser pr_debug("Removing aborted command %p from queue on dev %s.\n", 1240bc2d214aSBodo Stroesser cmd, udev->name); 1241bc2d214aSBodo Stroesser 1242bc2d214aSBodo Stroesser list_del_init(&cmd->queue_entry); 1243bc2d214aSBodo Stroesser tcmu_free_cmd(cmd); 1244bc2d214aSBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); 1245bc2d214aSBodo Stroesser unqueued = true; 1246bc2d214aSBodo Stroesser } 1247bc2d214aSBodo Stroesser if (unqueued) 1248bc2d214aSBodo Stroesser tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1249bc2d214aSBodo Stroesser 125059526d7aSBodo Stroesser if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) 125159526d7aSBodo Stroesser goto unlock; 125259526d7aSBodo Stroesser 1253bc2d214aSBodo Stroesser pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", 1254bc2d214aSBodo Stroesser tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); 1255bc2d214aSBodo Stroesser 1256bc2d214aSBodo Stroesser tmr = kmalloc(sizeof(*tmr) + cmd_cnt * sizeof(*cmd_ids), GFP_KERNEL); 1257bc2d214aSBodo Stroesser if (!tmr) 1258bc2d214aSBodo Stroesser goto unlock; 1259bc2d214aSBodo Stroesser 1260bc2d214aSBodo Stroesser tmr->tmr_type = tcmu_tmr_type(tmf); 1261bc2d214aSBodo Stroesser tmr->tmr_cmd_cnt = cmd_cnt; 1262bc2d214aSBodo Stroesser 1263bc2d214aSBodo Stroesser if (cmd_cnt != 0) { 1264bc2d214aSBodo Stroesser cmd_cnt = 0; 1265bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1266bc2d214aSBodo Stroesser if (!se_cmd->priv) 1267bc2d214aSBodo Stroesser continue; 1268bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1269bc2d214aSBodo Stroesser if (cmd->cmd_id) 1270bc2d214aSBodo Stroesser tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; 1271bc2d214aSBodo Stroesser } 1272bc2d214aSBodo Stroesser } 1273bc2d214aSBodo Stroesser 1274bc2d214aSBodo Stroesser queue_tmr_ring(udev, tmr); 1275bc2d214aSBodo Stroesser 1276bc2d214aSBodo Stroesser unlock: 1277bc2d214aSBodo Stroesser mutex_unlock(&udev->cmdr_lock); 1278bc2d214aSBodo Stroesser } 1279bc2d214aSBodo Stroesser 12807c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 12817c9e7a6fSAndy Grover { 12827c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 12837c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 12846c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 1285a86a7586SDmitry Fomichev uint32_t read_len; 12867c9e7a6fSAndy Grover 1287b25c7863SSheng Yang /* 1288b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 12893d9b9555SAndy Grover * data area space and free cmd 1290b25c7863SSheng Yang */ 1291a86a7586SDmitry Fomichev if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1292a86a7586SDmitry Fomichev WARN_ON_ONCE(se_cmd); 1293141685a3SXiubo Li goto out; 1294a86a7586SDmitry Fomichev } 1295b25c7863SSheng Yang 1296a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1297a94a2572SXiubo Li 1298141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 12997c9e7a6fSAndy Grover 13000ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 13010ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 13020ad46af8SAndy Grover cmd->se_cmd); 1303ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 13046c3796d1Sbstroesser@ts.fujitsu.com goto done; 13056c3796d1Sbstroesser@ts.fujitsu.com } 13066c3796d1Sbstroesser@ts.fujitsu.com 1307a86a7586SDmitry Fomichev read_len = se_cmd->data_length; 13086c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 13096c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 13106c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 13116c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 13126c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 13136c3796d1Sbstroesser@ts.fujitsu.com } 13146c3796d1Sbstroesser@ts.fujitsu.com 13156c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1316406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 13176c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 13186c3796d1Sbstroesser@ts.fujitsu.com goto done; 13196c3796d1Sbstroesser@ts.fujitsu.com else 13206c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 13216c3796d1Sbstroesser@ts.fujitsu.com } 13226c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 132326418649SSheng Yang /* Get Data-In buffer before clean up */ 13246c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1325e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 13266c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 13277c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1328141685a3SXiubo Li /* TODO: */ 13292bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 13302bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 13312bc396a2SIlias Tsitsimpis se_cmd->data_direction); 13327c9e7a6fSAndy Grover } 13337c9e7a6fSAndy Grover 13346c3796d1Sbstroesser@ts.fujitsu.com done: 13356c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 13366c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 13376c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 13386c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 13396c3796d1Sbstroesser@ts.fujitsu.com } else 13407c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 13417c9e7a6fSAndy Grover 1342141685a3SXiubo Li out: 1343b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1344141685a3SXiubo Li tcmu_free_cmd(cmd); 13457c9e7a6fSAndy Grover } 13467c9e7a6fSAndy Grover 1347bc2d214aSBodo Stroesser static int tcmu_run_tmr_queue(struct tcmu_dev *udev) 1348bc2d214aSBodo Stroesser { 1349bc2d214aSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 1350bc2d214aSBodo Stroesser LIST_HEAD(tmrs); 1351bc2d214aSBodo Stroesser 1352bc2d214aSBodo Stroesser if (list_empty(&udev->tmr_queue)) 1353bc2d214aSBodo Stroesser return 1; 1354bc2d214aSBodo Stroesser 1355bc2d214aSBodo Stroesser pr_debug("running %s's tmr queue\n", udev->name); 1356bc2d214aSBodo Stroesser 1357bc2d214aSBodo Stroesser list_splice_init(&udev->tmr_queue, &tmrs); 1358bc2d214aSBodo Stroesser 1359bc2d214aSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { 1360bc2d214aSBodo Stroesser list_del_init(&tmr->queue_entry); 1361bc2d214aSBodo Stroesser 1362bc2d214aSBodo Stroesser pr_debug("removing tmr %p on dev %s from queue\n", 1363bc2d214aSBodo Stroesser tmr, udev->name); 1364bc2d214aSBodo Stroesser 1365bc2d214aSBodo Stroesser if (queue_tmr_ring(udev, tmr)) { 1366bc2d214aSBodo Stroesser pr_debug("ran out of space during tmr queue run\n"); 1367bc2d214aSBodo Stroesser /* 1368bc2d214aSBodo Stroesser * tmr was requeued, so just put all tmrs back in 1369bc2d214aSBodo Stroesser * the queue 1370bc2d214aSBodo Stroesser */ 1371bc2d214aSBodo Stroesser list_splice_tail(&tmrs, &udev->tmr_queue); 1372bc2d214aSBodo Stroesser return 0; 1373bc2d214aSBodo Stroesser } 1374bc2d214aSBodo Stroesser } 1375bc2d214aSBodo Stroesser 1376bc2d214aSBodo Stroesser return 1; 1377bc2d214aSBodo Stroesser } 1378bc2d214aSBodo Stroesser 13797c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 13807c9e7a6fSAndy Grover { 13817c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1382a94a2572SXiubo Li struct tcmu_cmd *cmd; 1383bc2d214aSBodo Stroesser bool free_space = false; 13847c9e7a6fSAndy Grover 13857c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 13867c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 13877c9e7a6fSAndy Grover return 0; 13887c9e7a6fSAndy Grover } 13897c9e7a6fSAndy Grover 13907c9e7a6fSAndy Grover mb = udev->mb_addr; 13917c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 13927c9e7a6fSAndy Grover 13936aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 13947c9e7a6fSAndy Grover 13957c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 13967c9e7a6fSAndy Grover 13975a0c256dSBodo Stroesser /* 13985a0c256dSBodo Stroesser * Flush max. up to end of cmd ring since current entry might 13995a0c256dSBodo Stroesser * be a padding that is shorter than sizeof(*entry) 14005a0c256dSBodo Stroesser */ 14015a0c256dSBodo Stroesser size_t ring_left = head_to_end(udev->cmdr_last_cleaned, 14025a0c256dSBodo Stroesser udev->cmdr_size); 14035a0c256dSBodo Stroesser tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? 14045a0c256dSBodo Stroesser ring_left : sizeof(*entry)); 14057c9e7a6fSAndy Grover 1406bc2d214aSBodo Stroesser free_space = true; 1407bc2d214aSBodo Stroesser 1408bc2d214aSBodo Stroesser if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || 1409bc2d214aSBodo Stroesser tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { 14100ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14110ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14120ad46af8SAndy Grover udev->cmdr_size); 14137c9e7a6fSAndy Grover continue; 14147c9e7a6fSAndy Grover } 14150ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 14167c9e7a6fSAndy Grover 1417d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 14187c9e7a6fSAndy Grover if (!cmd) { 141988cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 142088cf1073SMike Christie entry->hdr.cmd_id); 14217c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 14227c9e7a6fSAndy Grover break; 14237c9e7a6fSAndy Grover } 14247c9e7a6fSAndy Grover 14257c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 14267c9e7a6fSAndy Grover 14270ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14280ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14290ad46af8SAndy Grover udev->cmdr_size); 14307c9e7a6fSAndy Grover } 1431bc2d214aSBodo Stroesser if (free_space) 1432bc2d214aSBodo Stroesser free_space = tcmu_run_tmr_queue(udev); 14337c9e7a6fSAndy Grover 1434ed212ca8SBodo Stroesser if (atomic_read(&global_db_count) > tcmu_global_max_blocks && 1435ed212ca8SBodo Stroesser idr_is_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { 1436af1dd7ffSMike Christie /* 1437ed212ca8SBodo Stroesser * Allocated blocks exceeded global block limit, currently no 1438ed212ca8SBodo Stroesser * more pending or waiting commands so try to reclaim blocks. 1439af1dd7ffSMike Christie */ 1440af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1441af1dd7ffSMike Christie } 1442ed212ca8SBodo Stroesser if (udev->cmd_time_out) 1443a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 14447c9e7a6fSAndy Grover 1445bc2d214aSBodo Stroesser return free_space; 14467c9e7a6fSAndy Grover } 14477c9e7a6fSAndy Grover 144861fb2482SBodo Stroesser static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) 14497c9e7a6fSAndy Grover { 1450af1dd7ffSMike Christie struct se_cmd *se_cmd; 14517c9e7a6fSAndy Grover 1452ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 145361fb2482SBodo Stroesser return; 14549103575aSMike Christie 1455af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 145640d883b0SXiubo Li list_del_init(&cmd->queue_entry); 145761fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 1458a3512902SBodo Stroesser se_cmd->priv = NULL; 1459a86a7586SDmitry Fomichev cmd->se_cmd = NULL; 146061fb2482SBodo Stroesser 146161fb2482SBodo Stroesser pr_debug("Timing out inflight cmd %u on dev %s.\n", 146261fb2482SBodo Stroesser cmd->cmd_id, cmd->tcmu_dev->name); 146361fb2482SBodo Stroesser 146461fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); 1465af1dd7ffSMike Christie } 14669103575aSMike Christie 146761fb2482SBodo Stroesser static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) 146861fb2482SBodo Stroesser { 146961fb2482SBodo Stroesser struct se_cmd *se_cmd; 14709103575aSMike Christie 1471ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 147261fb2482SBodo Stroesser return; 147361fb2482SBodo Stroesser 14749d7464b1SDan Carpenter pr_debug("Timing out queued cmd %p on dev %s.\n", 14759d7464b1SDan Carpenter cmd, cmd->tcmu_dev->name); 14769d7464b1SDan Carpenter 147761fb2482SBodo Stroesser list_del_init(&cmd->queue_entry); 147861fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 147961fb2482SBodo Stroesser tcmu_free_cmd(cmd); 148061fb2482SBodo Stroesser 148161fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); 14827c9e7a6fSAndy Grover } 14837c9e7a6fSAndy Grover 14849103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 14857c9e7a6fSAndy Grover { 1486488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1487488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1488488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1489488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 14907c9e7a6fSAndy Grover 1491af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 14927c9e7a6fSAndy Grover } 14937c9e7a6fSAndy Grover 14949103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 14959103575aSMike Christie { 14969103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 14979103575aSMike Christie 14989103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 14999103575aSMike Christie tcmu_device_timedout(udev); 15009103575aSMike Christie } 15019103575aSMike Christie 15029103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 15039103575aSMike Christie { 15049103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 15059103575aSMike Christie 15069103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 15079103575aSMike Christie tcmu_device_timedout(udev); 15089103575aSMike Christie } 15099103575aSMike Christie 15107c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 15117c9e7a6fSAndy Grover { 15127c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 15137c9e7a6fSAndy Grover 15147c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 15157c9e7a6fSAndy Grover if (!tcmu_hba) 15167c9e7a6fSAndy Grover return -ENOMEM; 15177c9e7a6fSAndy Grover 15187c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 15197c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 15207c9e7a6fSAndy Grover 15217c9e7a6fSAndy Grover return 0; 15227c9e7a6fSAndy Grover } 15237c9e7a6fSAndy Grover 15247c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 15257c9e7a6fSAndy Grover { 15267c9e7a6fSAndy Grover kfree(hba->hba_ptr); 15277c9e7a6fSAndy Grover hba->hba_ptr = NULL; 15287c9e7a6fSAndy Grover } 15297c9e7a6fSAndy Grover 15307c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 15317c9e7a6fSAndy Grover { 15327c9e7a6fSAndy Grover struct tcmu_dev *udev; 15337c9e7a6fSAndy Grover 15347c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 15357c9e7a6fSAndy Grover if (!udev) 15367c9e7a6fSAndy Grover return NULL; 1537f3cdbe39SMike Christie kref_init(&udev->kref); 15387c9e7a6fSAndy Grover 15397c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 15407c9e7a6fSAndy Grover if (!udev->name) { 15417c9e7a6fSAndy Grover kfree(udev); 15427c9e7a6fSAndy Grover return NULL; 15437c9e7a6fSAndy Grover } 15447c9e7a6fSAndy Grover 15457c9e7a6fSAndy Grover udev->hba = hba; 1546af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 15479103575aSMike Christie udev->qfull_time_out = -1; 15487c9e7a6fSAndy Grover 154980eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1550b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 15517c9e7a6fSAndy Grover 1552ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1553488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1554a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1555bc2d214aSBodo Stroesser INIT_LIST_HEAD(&udev->tmr_queue); 1556a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 15577c9e7a6fSAndy Grover idr_init(&udev->commands); 15587c9e7a6fSAndy Grover 15599103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 15609103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 15617c9e7a6fSAndy Grover 1562c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1563c22adc0bSXiubo Li 15647c9e7a6fSAndy Grover return &udev->se_dev; 15657c9e7a6fSAndy Grover } 15667c9e7a6fSAndy Grover 156761fb2482SBodo Stroesser static void run_qfull_queue(struct tcmu_dev *udev, bool fail) 1568af1dd7ffSMike Christie { 1569af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1570af1dd7ffSMike Christie LIST_HEAD(cmds); 1571af1dd7ffSMike Christie sense_reason_t scsi_ret; 1572af1dd7ffSMike Christie int ret; 1573af1dd7ffSMike Christie 1574a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 157561fb2482SBodo Stroesser return; 1576af1dd7ffSMike Christie 1577892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1578af1dd7ffSMike Christie 1579a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1580af1dd7ffSMike Christie 1581a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1582a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1583af1dd7ffSMike Christie 158461fb2482SBodo Stroesser pr_debug("removing cmd %p on dev %s from queue\n", 158561fb2482SBodo Stroesser tcmu_cmd, udev->name); 1586af1dd7ffSMike Christie 1587892782caSMike Christie if (fail) { 1588892782caSMike Christie /* 1589892782caSMike Christie * We were not able to even start the command, so 1590892782caSMike Christie * fail with busy to allow a retry in case runner 1591892782caSMike Christie * was only temporarily down. If the device is being 1592892782caSMike Christie * removed then LIO core will do the right thing and 1593892782caSMike Christie * fail the retry. 1594892782caSMike Christie */ 1595892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1596892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1597892782caSMike Christie continue; 1598892782caSMike Christie } 1599892782caSMike Christie 1600af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1601af1dd7ffSMike Christie if (ret < 0) { 160261fb2482SBodo Stroesser pr_debug("cmd %p on dev %s failed with %u\n", 160361fb2482SBodo Stroesser tcmu_cmd, udev->name, scsi_ret); 1604af1dd7ffSMike Christie /* 1605af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1606af1dd7ffSMike Christie * drops it. 1607af1dd7ffSMike Christie */ 1608af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1609af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1610af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1611af1dd7ffSMike Christie } else if (ret > 0) { 1612af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1613af1dd7ffSMike Christie /* 1614af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1615af1dd7ffSMike Christie * the queue 1616af1dd7ffSMike Christie */ 1617a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1618a94a2572SXiubo Li break; 1619af1dd7ffSMike Christie } 1620af1dd7ffSMike Christie } 1621a94a2572SXiubo Li 1622a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1623af1dd7ffSMike Christie } 1624af1dd7ffSMike Christie 16257c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 16267c9e7a6fSAndy Grover { 1627af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 16287c9e7a6fSAndy Grover 1629af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1630bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 1631a94a2572SXiubo Li run_qfull_queue(udev, false); 1632af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 16337c9e7a6fSAndy Grover 16347c9e7a6fSAndy Grover return 0; 16357c9e7a6fSAndy Grover } 16367c9e7a6fSAndy Grover 16377c9e7a6fSAndy Grover /* 16387c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 16397c9e7a6fSAndy Grover * and this stuff must come along. 16407c9e7a6fSAndy Grover */ 16417c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 16427c9e7a6fSAndy Grover { 16437c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 16447c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 16457c9e7a6fSAndy Grover 16467c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 16477c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 16487c9e7a6fSAndy Grover return -1; 16497c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 16507c9e7a6fSAndy Grover } 16517c9e7a6fSAndy Grover return -1; 16527c9e7a6fSAndy Grover } 16537c9e7a6fSAndy Grover 1654b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1655b6df4b79SXiubo Li { 1656b6df4b79SXiubo Li struct page *page; 1657b6df4b79SXiubo Li 1658b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1659b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1660b6df4b79SXiubo Li if (likely(page)) { 1661b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1662b6df4b79SXiubo Li return page; 1663b6df4b79SXiubo Li } 1664b6df4b79SXiubo Li 1665b6df4b79SXiubo Li /* 1666c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1667c1c390baSMike Christie * data iov passed to it. 1668b6df4b79SXiubo Li */ 1669c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1670c1c390baSMike Christie dbi, udev->name); 1671c1c390baSMike Christie page = NULL; 1672b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1673b6df4b79SXiubo Li 1674b6df4b79SXiubo Li return page; 1675b6df4b79SXiubo Li } 1676b6df4b79SXiubo Li 167769589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 16787c9e7a6fSAndy Grover { 167911bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 16807c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 16817c9e7a6fSAndy Grover struct page *page; 16827c9e7a6fSAndy Grover unsigned long offset; 16837c9e7a6fSAndy Grover void *addr; 16847c9e7a6fSAndy Grover 168511bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 16867c9e7a6fSAndy Grover if (mi < 0) 16877c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 16887c9e7a6fSAndy Grover 16897c9e7a6fSAndy Grover /* 16907c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 16917c9e7a6fSAndy Grover * to use mem[N]. 16927c9e7a6fSAndy Grover */ 16937c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 16947c9e7a6fSAndy Grover 1695141685a3SXiubo Li if (offset < udev->data_off) { 1696141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 16977c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 16987c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1699141685a3SXiubo Li } else { 1700141685a3SXiubo Li uint32_t dbi; 1701141685a3SXiubo Li 1702b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1703141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1704b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1705b6df4b79SXiubo Li if (!page) 1706c1c390baSMike Christie return VM_FAULT_SIGBUS; 1707141685a3SXiubo Li } 1708141685a3SXiubo Li 17097c9e7a6fSAndy Grover get_page(page); 17107c9e7a6fSAndy Grover vmf->page = page; 17117c9e7a6fSAndy Grover return 0; 17127c9e7a6fSAndy Grover } 17137c9e7a6fSAndy Grover 17147c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 17157c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 17167c9e7a6fSAndy Grover }; 17177c9e7a6fSAndy Grover 17187c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 17197c9e7a6fSAndy Grover { 17207c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 17217c9e7a6fSAndy Grover 17227c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 17237c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 17247c9e7a6fSAndy Grover 17257c9e7a6fSAndy Grover vma->vm_private_data = udev; 17267c9e7a6fSAndy Grover 17277c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 172880eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 17297c9e7a6fSAndy Grover return -EINVAL; 17307c9e7a6fSAndy Grover 17317c9e7a6fSAndy Grover return 0; 17327c9e7a6fSAndy Grover } 17337c9e7a6fSAndy Grover 17347c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 17357c9e7a6fSAndy Grover { 17367c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 17377c9e7a6fSAndy Grover 17387c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 17397c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 17407c9e7a6fSAndy Grover return -EBUSY; 17417c9e7a6fSAndy Grover 1742b6df4b79SXiubo Li udev->inode = inode; 17439260695dSMike Christie kref_get(&udev->kref); 1744b6df4b79SXiubo Li 17457c9e7a6fSAndy Grover pr_debug("open\n"); 17467c9e7a6fSAndy Grover 17477c9e7a6fSAndy Grover return 0; 17487c9e7a6fSAndy Grover } 17497c9e7a6fSAndy Grover 1750f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1751f3cdbe39SMike Christie { 1752f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1753f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1754f3cdbe39SMike Christie 1755f3cdbe39SMike Christie kfree(udev->uio_info.name); 1756f3cdbe39SMike Christie kfree(udev->name); 1757f3cdbe39SMike Christie kfree(udev); 1758f3cdbe39SMike Christie } 1759f3cdbe39SMike Christie 1760c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1761c22adc0bSXiubo Li { 1762c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1763c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1764c22adc0bSXiubo Li return 0; 1765c22adc0bSXiubo Li } 1766c22adc0bSXiubo Li return -EINVAL; 1767c22adc0bSXiubo Li } 1768c22adc0bSXiubo Li 1769bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1770bf99ec13SMike Christie int start, int end) 1771c22adc0bSXiubo Li { 1772c22adc0bSXiubo Li int i; 1773c22adc0bSXiubo Li struct page *page; 1774c22adc0bSXiubo Li 1775bf99ec13SMike Christie for (i = start; i < end; i++) { 1776bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1777c22adc0bSXiubo Li if (page) { 1778c22adc0bSXiubo Li __free_page(page); 1779c22adc0bSXiubo Li atomic_dec(&global_db_count); 1780c22adc0bSXiubo Li } 1781c22adc0bSXiubo Li } 1782c22adc0bSXiubo Li } 1783c22adc0bSXiubo Li 1784bc2d214aSBodo Stroesser static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) 1785bc2d214aSBodo Stroesser { 1786bc2d214aSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 1787bc2d214aSBodo Stroesser 1788bc2d214aSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { 1789bc2d214aSBodo Stroesser list_del_init(&tmr->queue_entry); 1790bc2d214aSBodo Stroesser kfree(tmr); 1791bc2d214aSBodo Stroesser } 1792bc2d214aSBodo Stroesser } 1793bc2d214aSBodo Stroesser 1794f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1795f3cdbe39SMike Christie { 1796f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1797f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1798c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1799c22adc0bSXiubo Li bool all_expired = true; 1800c22adc0bSXiubo Li int i; 1801c22adc0bSXiubo Li 1802c22adc0bSXiubo Li vfree(udev->mb_addr); 1803c22adc0bSXiubo Li udev->mb_addr = NULL; 1804c22adc0bSXiubo Li 1805488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1806488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1807488ebe4cSMike Christie list_del(&udev->timedout_entry); 1808488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1809488ebe4cSMike Christie 1810c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 18116fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1812c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1813c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1814c22adc0bSXiubo Li all_expired = false; 1815c22adc0bSXiubo Li } 1816bc2d214aSBodo Stroesser /* There can be left over TMR cmds. Remove them. */ 1817bc2d214aSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 181861fb2482SBodo Stroesser if (!list_empty(&udev->qfull_queue)) 181961fb2482SBodo Stroesser all_expired = false; 1820c22adc0bSXiubo Li idr_destroy(&udev->commands); 1821c22adc0bSXiubo Li WARN_ON(!all_expired); 1822c22adc0bSXiubo Li 1823bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 182498effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 1825bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1826f3cdbe39SMike Christie 1827f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1828f3cdbe39SMike Christie } 1829f3cdbe39SMike Christie 18307c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 18317c9e7a6fSAndy Grover { 18327c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18337c9e7a6fSAndy Grover 18347c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 18357c9e7a6fSAndy Grover 18367c9e7a6fSAndy Grover pr_debug("close\n"); 18379260695dSMike Christie /* release ref from open */ 1838f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 18397c9e7a6fSAndy Grover return 0; 18407c9e7a6fSAndy Grover } 18417c9e7a6fSAndy Grover 18429de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1843b3af66e2SMike Christie { 1844b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1845b3af66e2SMike Christie 1846b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 18479de3a1efSMike Christie return 0; 1848b849b456SKenjiro Nakayama 1849b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 18509de3a1efSMike Christie return 0; 1851b849b456SKenjiro Nakayama 18523228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1853b3af66e2SMike Christie 1854bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1855bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1856bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1857bdaeedc1SMike Christie udev->name); 1858bdaeedc1SMike Christie return -EAGAIN; 1859bdaeedc1SMike Christie } 1860b3af66e2SMike Christie 1861b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 18623228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 18639de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 18649de3a1efSMike Christie nl_cmd->cmd, udev->name); 18659de3a1efSMike Christie return -EBUSY; 1866b3af66e2SMike Christie } 1867b3af66e2SMike Christie 1868b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1869b3af66e2SMike Christie nl_cmd->cmd = cmd; 18703228691fSMike Christie nl_cmd->udev = udev; 1871b3af66e2SMike Christie init_completion(&nl_cmd->complete); 18723228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1873b3af66e2SMike Christie 18743228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 18753228691fSMike Christie 18763228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 18779de3a1efSMike Christie return 0; 1878b3af66e2SMike Christie } 1879b3af66e2SMike Christie 18807d894862SLi Zhong static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) 18817d894862SLi Zhong { 18827d894862SLi Zhong struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 18837d894862SLi Zhong 18847d894862SLi Zhong if (!tcmu_kern_cmd_reply_supported) 18857d894862SLi Zhong return; 18867d894862SLi Zhong 18877d894862SLi Zhong if (udev->nl_reply_supported <= 0) 18887d894862SLi Zhong return; 18897d894862SLi Zhong 18907d894862SLi Zhong mutex_lock(&tcmu_nl_cmd_mutex); 18917d894862SLi Zhong 18927d894862SLi Zhong list_del(&nl_cmd->nl_list); 18937d894862SLi Zhong memset(nl_cmd, 0, sizeof(*nl_cmd)); 18947d894862SLi Zhong 18957d894862SLi Zhong mutex_unlock(&tcmu_nl_cmd_mutex); 18967d894862SLi Zhong } 18977d894862SLi Zhong 1898b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1899b3af66e2SMike Christie { 1900b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1901b3af66e2SMike Christie int ret; 1902b3af66e2SMike Christie 1903b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1904b3af66e2SMike Christie return 0; 1905b3af66e2SMike Christie 1906b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1907b849b456SKenjiro Nakayama return 0; 1908b849b456SKenjiro Nakayama 1909b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1910b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1911b3af66e2SMike Christie 19123228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1913b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1914b3af66e2SMike Christie ret = nl_cmd->status; 19153228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1916b3af66e2SMike Christie 191785fae482SLuis de Bethencourt return ret; 1918b3af66e2SMike Christie } 1919b3af66e2SMike Christie 19200e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 19210e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 19220e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 19237c9e7a6fSAndy Grover { 19247c9e7a6fSAndy Grover struct sk_buff *skb; 19257c9e7a6fSAndy Grover void *msg_header; 19266e14eab9SNicholas Bellinger int ret = -ENOMEM; 19277c9e7a6fSAndy Grover 19287c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 19297c9e7a6fSAndy Grover if (!skb) 19306e14eab9SNicholas Bellinger return ret; 19317c9e7a6fSAndy Grover 19327c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 19336e14eab9SNicholas Bellinger if (!msg_header) 19346e14eab9SNicholas Bellinger goto free_skb; 19357c9e7a6fSAndy Grover 1936b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 19376e14eab9SNicholas Bellinger if (ret < 0) 19386e14eab9SNicholas Bellinger goto free_skb; 19397c9e7a6fSAndy Grover 1940b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1941b3af66e2SMike Christie if (ret < 0) 1942b3af66e2SMike Christie goto free_skb; 1943b3af66e2SMike Christie 1944b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 19456e14eab9SNicholas Bellinger if (ret < 0) 19466e14eab9SNicholas Bellinger goto free_skb; 19477c9e7a6fSAndy Grover 19480e5aee39SZhu Lingshan *buf = skb; 19490e5aee39SZhu Lingshan *hdr = msg_header; 19500e5aee39SZhu Lingshan return ret; 19510e5aee39SZhu Lingshan 19520e5aee39SZhu Lingshan free_skb: 19530e5aee39SZhu Lingshan nlmsg_free(skb); 19540e5aee39SZhu Lingshan return ret; 19552d76443eSMike Christie } 19562d76443eSMike Christie 19570e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 19580e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 195906add777SMike Christie struct sk_buff *skb, void *msg_header) 19600e5aee39SZhu Lingshan { 196106add777SMike Christie int ret; 19628a45885cSBryant G. Ly 1963053c095aSJohannes Berg genlmsg_end(skb, msg_header); 19647c9e7a6fSAndy Grover 19659de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 19669de3a1efSMike Christie if (ret) { 19679de3a1efSMike Christie nlmsg_free(skb); 19689de3a1efSMike Christie return ret; 19699de3a1efSMike Christie } 1970b3af66e2SMike Christie 197120c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 19727c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 19732ff717cdSCathy Avery 19742ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 19752ff717cdSCathy Avery if (ret == 0 || 19762ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 19772ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 19787d894862SLi Zhong else 19797d894862SLi Zhong tcmu_destroy_genl_cmd_reply(udev); 19802ff717cdSCathy Avery 19810e5aee39SZhu Lingshan return ret; 19820e5aee39SZhu Lingshan } 19837c9e7a6fSAndy Grover 1984e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 1985e0c240acSZhu Lingshan { 1986e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 1987e0c240acSZhu Lingshan void *msg_header = NULL; 1988e0c240acSZhu Lingshan int ret = 0; 1989e0c240acSZhu Lingshan 1990e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 1991e0c240acSZhu Lingshan &msg_header); 1992e0c240acSZhu Lingshan if (ret < 0) 19937c9e7a6fSAndy Grover return ret; 199406add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 199506add777SMike Christie msg_header); 1996e0c240acSZhu Lingshan } 1997e0c240acSZhu Lingshan 1998f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 1999f892bd8eSZhu Lingshan { 2000f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 2001f892bd8eSZhu Lingshan void *msg_header = NULL; 2002f892bd8eSZhu Lingshan int ret = 0; 2003f892bd8eSZhu Lingshan 2004f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 2005f892bd8eSZhu Lingshan &skb, &msg_header); 2006f892bd8eSZhu Lingshan if (ret < 0) 20076e14eab9SNicholas Bellinger return ret; 2008f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 200906add777SMike Christie skb, msg_header); 20107c9e7a6fSAndy Grover } 20117c9e7a6fSAndy Grover 2012de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 20137c9e7a6fSAndy Grover { 20147c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 20157c9e7a6fSAndy Grover struct uio_info *info; 20167c9e7a6fSAndy Grover char *str; 20177c9e7a6fSAndy Grover 20187c9e7a6fSAndy Grover info = &udev->uio_info; 201922c2f35fSChristophe JAILLET 202022c2f35fSChristophe JAILLET if (udev->dev_config[0]) 202122c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, 202222c2f35fSChristophe JAILLET udev->name, udev->dev_config); 202322c2f35fSChristophe JAILLET else 202422c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, 202522c2f35fSChristophe JAILLET udev->name); 20267c9e7a6fSAndy Grover if (!str) 20277c9e7a6fSAndy Grover return -ENOMEM; 20287c9e7a6fSAndy Grover 2029ededd039SBryant G. Ly /* If the old string exists, free it */ 2030ededd039SBryant G. Ly kfree(info->name); 20317c9e7a6fSAndy Grover info->name = str; 20327c9e7a6fSAndy Grover 2033de8c5221SBryant G. Ly return 0; 2034de8c5221SBryant G. Ly } 2035de8c5221SBryant G. Ly 2036de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 2037de8c5221SBryant G. Ly { 2038de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 2039de8c5221SBryant G. Ly struct uio_info *info; 2040de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 2041de8c5221SBryant G. Ly int ret = 0; 2042de8c5221SBryant G. Ly 2043de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2044de8c5221SBryant G. Ly if (ret) 2045de8c5221SBryant G. Ly return ret; 2046de8c5221SBryant G. Ly 2047de8c5221SBryant G. Ly info = &udev->uio_info; 2048de8c5221SBryant G. Ly 2049c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 205098effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 2051c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2052a24e7917SWei Yongjun if (!udev->data_bitmap) { 2053a24e7917SWei Yongjun ret = -ENOMEM; 205480eb8761SMike Christie goto err_bitmap_alloc; 2055a24e7917SWei Yongjun } 205680eb8761SMike Christie 2057141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 20587c9e7a6fSAndy Grover if (!udev->mb_addr) { 20597c9e7a6fSAndy Grover ret = -ENOMEM; 20607c9e7a6fSAndy Grover goto err_vzalloc; 20617c9e7a6fSAndy Grover } 20627c9e7a6fSAndy Grover 20637c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 20647c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 20657c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 206680eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 2067b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 20687c9e7a6fSAndy Grover 2069141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 20707c9e7a6fSAndy Grover mb = udev->mb_addr; 20710ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 2072bc2d214aSBodo Stroesser mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | 2073bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_READ_LEN | 2074bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_TMR; 20757c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 20767c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 20777c9e7a6fSAndy Grover 20787c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 20797c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 208026418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 20817c9e7a6fSAndy Grover 2082ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 20837c9e7a6fSAndy Grover 20847c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 20850633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 208680eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 2087141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 20887c9e7a6fSAndy Grover 20897c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 20907c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 20917c9e7a6fSAndy Grover 20927c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 20937c9e7a6fSAndy Grover info->open = tcmu_open; 20947c9e7a6fSAndy Grover info->release = tcmu_release; 20957c9e7a6fSAndy Grover 20967c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 20977c9e7a6fSAndy Grover if (ret) 20987c9e7a6fSAndy Grover goto err_register; 20997c9e7a6fSAndy Grover 210081ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 210181ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 21027c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 210381ee28deSSheng Yang /* Other attributes can be configured in userspace */ 21043abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 21057c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 21069a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 21079a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 21087c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 21097c9e7a6fSAndy Grover 2110b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 2111b849b456SKenjiro Nakayama * module scope setting. 2112b849b456SKenjiro Nakayama */ 2113b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 2114b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 2115b849b456SKenjiro Nakayama 2116f3cdbe39SMike Christie /* 2117f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 2118f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 2119f3cdbe39SMike Christie */ 2120f3cdbe39SMike Christie kref_get(&udev->kref); 2121f3cdbe39SMike Christie 2122e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 21237c9e7a6fSAndy Grover if (ret) 21247c9e7a6fSAndy Grover goto err_netlink; 21257c9e7a6fSAndy Grover 2126b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2127b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 2128b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2129b6df4b79SXiubo Li 21307c9e7a6fSAndy Grover return 0; 21317c9e7a6fSAndy Grover 21327c9e7a6fSAndy Grover err_netlink: 2133f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 21347c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 21357c9e7a6fSAndy Grover err_register: 21367c9e7a6fSAndy Grover vfree(udev->mb_addr); 2137c22adc0bSXiubo Li udev->mb_addr = NULL; 21387c9e7a6fSAndy Grover err_vzalloc: 213998effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 214080eb8761SMike Christie udev->data_bitmap = NULL; 214180eb8761SMike Christie err_bitmap_alloc: 21427c9e7a6fSAndy Grover kfree(info->name); 2143f3cdbe39SMike Christie info->name = NULL; 21447c9e7a6fSAndy Grover 21457c9e7a6fSAndy Grover return ret; 21467c9e7a6fSAndy Grover } 21477c9e7a6fSAndy Grover 21487c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 21497c9e7a6fSAndy Grover { 21507c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 215192634706SMike Christie 215292634706SMike Christie /* release ref from init */ 215392634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 215492634706SMike Christie } 215592634706SMike Christie 215692634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 215792634706SMike Christie { 215892634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 21597c9e7a6fSAndy Grover 21609103575aSMike Christie del_timer_sync(&udev->cmd_timer); 21619103575aSMike Christie del_timer_sync(&udev->qfull_timer); 21627c9e7a6fSAndy Grover 2163b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2164b6df4b79SXiubo Li list_del(&udev->node); 2165b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2166b6df4b79SXiubo Li 2167f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 21687c9e7a6fSAndy Grover 21697c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 21709260695dSMike Christie 21719260695dSMike Christie /* release ref from configure */ 21729260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 21737c9e7a6fSAndy Grover } 21747c9e7a6fSAndy Grover 2175892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 2176892782caSMike Christie { 2177892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2178892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 2179892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2180892782caSMike Christie } 2181892782caSMike Christie 2182892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 2183892782caSMike Christie { 2184892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2185892782caSMike Christie 2186892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2187892782caSMike Christie goto unlock; 2188892782caSMike Christie 2189892782caSMike Christie /* complete IO that has executed successfully */ 2190892782caSMike Christie tcmu_handle_completions(udev); 2191892782caSMike Christie /* fail IO waiting to be queued */ 2192a94a2572SXiubo Li run_qfull_queue(udev, true); 2193892782caSMike Christie 2194892782caSMike Christie unlock: 2195892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2196892782caSMike Christie } 2197892782caSMike Christie 2198892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2199892782caSMike Christie { 2200892782caSMike Christie struct tcmu_mailbox *mb; 2201892782caSMike Christie struct tcmu_cmd *cmd; 2202892782caSMike Christie int i; 2203892782caSMike Christie 2204892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2205892782caSMike Christie 2206892782caSMike Christie idr_for_each_entry(&udev->commands, cmd, i) { 2207892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2208892782caSMike Christie cmd->cmd_id, udev->name, 2209892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2210892782caSMike Christie 2211892782caSMike Christie idr_remove(&udev->commands, i); 2212892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2213a86a7586SDmitry Fomichev WARN_ON(!cmd->se_cmd); 2214a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2215892782caSMike Christie if (err_level == 1) { 2216892782caSMike Christie /* 2217892782caSMike Christie * Userspace was not able to start the 2218892782caSMike Christie * command or it is retryable. 2219892782caSMike Christie */ 2220892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2221892782caSMike Christie } else { 2222892782caSMike Christie /* hard failure */ 2223892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2224892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2225892782caSMike Christie } 2226892782caSMike Christie } 2227892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2228892782caSMike Christie tcmu_free_cmd(cmd); 2229892782caSMike Christie } 2230892782caSMike Christie 2231892782caSMike Christie mb = udev->mb_addr; 2232892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2233892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2234892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2235892782caSMike Christie 2236892782caSMike Christie udev->cmdr_last_cleaned = 0; 2237892782caSMike Christie mb->cmd_tail = 0; 2238892782caSMike Christie mb->cmd_head = 0; 2239892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2240066f79a5SBodo Stroesser clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 2241892782caSMike Christie 2242892782caSMike Christie del_timer(&udev->cmd_timer); 2243892782caSMike Christie 2244bc2d214aSBodo Stroesser /* 2245bc2d214aSBodo Stroesser * ring is empty and qfull queue never contains aborted commands. 2246bc2d214aSBodo Stroesser * So TMRs in tmr queue do not contain relevant cmd_ids. 2247bc2d214aSBodo Stroesser * After a ring reset userspace should do a fresh start, so 2248bc2d214aSBodo Stroesser * even LUN RESET message is no longer relevant. 2249bc2d214aSBodo Stroesser * Therefore remove all TMRs from qfull queue 2250bc2d214aSBodo Stroesser */ 2251bc2d214aSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 2252bc2d214aSBodo Stroesser 225361fb2482SBodo Stroesser run_qfull_queue(udev, false); 225461fb2482SBodo Stroesser 2255892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2256892782caSMike Christie } 2257892782caSMike Christie 22587c9e7a6fSAndy Grover enum { 22593abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 226080eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 22617c9e7a6fSAndy Grover }; 22627c9e7a6fSAndy Grover 22637c9e7a6fSAndy Grover static match_table_t tokens = { 22647c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 22650e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2266b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2267b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2268b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2269c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 22707c9e7a6fSAndy Grover {Opt_err, NULL} 22717c9e7a6fSAndy Grover }; 22727c9e7a6fSAndy Grover 22733abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 22743abaa2bfSMike Christie { 2275b60cb1f8SMike Christie int val, ret; 22763abaa2bfSMike Christie 2277b60cb1f8SMike Christie ret = match_int(arg, &val); 22783abaa2bfSMike Christie if (ret < 0) { 2279b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2280b60cb1f8SMike Christie ret); 22813abaa2bfSMike Christie return ret; 22823abaa2bfSMike Christie } 2283b60cb1f8SMike Christie 2284b60cb1f8SMike Christie if (val <= 0) { 2285b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2286b60cb1f8SMike Christie val); 22873abaa2bfSMike Christie return -EINVAL; 22883abaa2bfSMike Christie } 2289b60cb1f8SMike Christie *dev_attrib = val; 22903abaa2bfSMike Christie return 0; 22913abaa2bfSMike Christie } 22923abaa2bfSMike Christie 2293c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2294c97840c8SMike Christie { 2295c97840c8SMike Christie int val, ret; 2296c97840c8SMike Christie 2297c97840c8SMike Christie ret = match_int(arg, &val); 2298c97840c8SMike Christie if (ret < 0) { 2299c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2300c97840c8SMike Christie ret); 2301c97840c8SMike Christie return ret; 2302c97840c8SMike Christie } 2303c97840c8SMike Christie 2304c97840c8SMike Christie if (val <= 0) { 2305c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2306c97840c8SMike Christie return -EINVAL; 2307c97840c8SMike Christie } 2308c97840c8SMike Christie 2309c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2310c97840c8SMike Christie if (udev->data_bitmap) { 2311c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2312c97840c8SMike Christie ret = -EINVAL; 2313c97840c8SMike Christie goto unlock; 2314c97840c8SMike Christie } 2315c97840c8SMike Christie 2316c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2317c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2318c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2319c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2320c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2321c97840c8SMike Christie } 2322c97840c8SMike Christie 2323c97840c8SMike Christie unlock: 2324c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2325c97840c8SMike Christie return ret; 2326c97840c8SMike Christie } 2327c97840c8SMike Christie 23287c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 23297c9e7a6fSAndy Grover const char *page, ssize_t count) 23307c9e7a6fSAndy Grover { 23317c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 23320e0d7526SMike Christie char *orig, *ptr, *opts; 23337c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2334c97840c8SMike Christie int ret = 0, token; 23357c9e7a6fSAndy Grover 23367c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 23377c9e7a6fSAndy Grover if (!opts) 23387c9e7a6fSAndy Grover return -ENOMEM; 23397c9e7a6fSAndy Grover 23407c9e7a6fSAndy Grover orig = opts; 23417c9e7a6fSAndy Grover 23427c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 23437c9e7a6fSAndy Grover if (!*ptr) 23447c9e7a6fSAndy Grover continue; 23457c9e7a6fSAndy Grover 23467c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 23477c9e7a6fSAndy Grover switch (token) { 23487c9e7a6fSAndy Grover case Opt_dev_config: 23497c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 23507c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 23517c9e7a6fSAndy Grover ret = -EINVAL; 23527c9e7a6fSAndy Grover break; 23537c9e7a6fSAndy Grover } 23547c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 23557c9e7a6fSAndy Grover break; 23567c9e7a6fSAndy Grover case Opt_dev_size: 23570e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 23587c9e7a6fSAndy Grover if (ret < 0) 23590e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 23600e0d7526SMike Christie ret); 23617c9e7a6fSAndy Grover break; 23629c1cd1b6SAndy Grover case Opt_hw_block_size: 23633abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 23643abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 23659c1cd1b6SAndy Grover break; 23663abaa2bfSMike Christie case Opt_hw_max_sectors: 23673abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 23683abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 23699c1cd1b6SAndy Grover break; 2370b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2371b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2372b849b456SKenjiro Nakayama if (ret < 0) 2373b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2374b60cb1f8SMike Christie ret); 2375b849b456SKenjiro Nakayama break; 237680eb8761SMike Christie case Opt_max_data_area_mb: 2377c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 237880eb8761SMike Christie break; 23797c9e7a6fSAndy Grover default: 23807c9e7a6fSAndy Grover break; 23817c9e7a6fSAndy Grover } 23822579325cSMike Christie 23832579325cSMike Christie if (ret) 23842579325cSMike Christie break; 23857c9e7a6fSAndy Grover } 23867c9e7a6fSAndy Grover 23877c9e7a6fSAndy Grover kfree(orig); 23887c9e7a6fSAndy Grover return (!ret) ? count : ret; 23897c9e7a6fSAndy Grover } 23907c9e7a6fSAndy Grover 23917c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 23927c9e7a6fSAndy Grover { 23937c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 23947c9e7a6fSAndy Grover ssize_t bl = 0; 23957c9e7a6fSAndy Grover 23967c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 23977c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 23980e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 239980eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 240080eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 24017c9e7a6fSAndy Grover 24027c9e7a6fSAndy Grover return bl; 24037c9e7a6fSAndy Grover } 24047c9e7a6fSAndy Grover 24057c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 24067c9e7a6fSAndy Grover { 24077c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 24087c9e7a6fSAndy Grover 24097c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 24107c9e7a6fSAndy Grover dev->dev_attrib.block_size); 24117c9e7a6fSAndy Grover } 24127c9e7a6fSAndy Grover 24137c9e7a6fSAndy Grover static sense_reason_t 24147c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 24157c9e7a6fSAndy Grover { 241602eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 24179c1cd1b6SAndy Grover } 24189c1cd1b6SAndy Grover 24197d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 24207d7a7435SNicholas Bellinger { 24217d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24227d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2423b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24247d7a7435SNicholas Bellinger 24257d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 24267d7a7435SNicholas Bellinger } 24277d7a7435SNicholas Bellinger 24287d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 24297d7a7435SNicholas Bellinger size_t count) 24307d7a7435SNicholas Bellinger { 24317d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24327d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 24337d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 24347d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 24357d7a7435SNicholas Bellinger u32 val; 24367d7a7435SNicholas Bellinger int ret; 24377d7a7435SNicholas Bellinger 24387d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 24397d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 24407d7a7435SNicholas Bellinger return -EINVAL; 24417d7a7435SNicholas Bellinger } 24427d7a7435SNicholas Bellinger 24437d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 24447d7a7435SNicholas Bellinger if (ret < 0) 24457d7a7435SNicholas Bellinger return ret; 24467d7a7435SNicholas Bellinger 24477d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 24487d7a7435SNicholas Bellinger return count; 24497d7a7435SNicholas Bellinger } 24507d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 24517d7a7435SNicholas Bellinger 24529103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 24539103575aSMike Christie { 24549103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 24559103575aSMike Christie struct se_dev_attrib, da_group); 24569103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24579103575aSMike Christie 24589103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 24599103575aSMike Christie udev->qfull_time_out : 24609103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 24619103575aSMike Christie } 24629103575aSMike Christie 24639103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 24649103575aSMike Christie const char *page, size_t count) 24659103575aSMike Christie { 24669103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 24679103575aSMike Christie struct se_dev_attrib, da_group); 24689103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24699103575aSMike Christie s32 val; 24709103575aSMike Christie int ret; 24719103575aSMike Christie 24729103575aSMike Christie ret = kstrtos32(page, 0, &val); 24739103575aSMike Christie if (ret < 0) 24749103575aSMike Christie return ret; 24759103575aSMike Christie 24769103575aSMike Christie if (val >= 0) { 24779103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2478125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2479125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 24809103575aSMike Christie } else { 24819103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 24829103575aSMike Christie return -EINVAL; 24839103575aSMike Christie } 24849103575aSMike Christie return count; 24859103575aSMike Christie } 24869103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 24879103575aSMike Christie 248880eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 248980eb8761SMike Christie { 249080eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 249180eb8761SMike Christie struct se_dev_attrib, da_group); 249280eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 249380eb8761SMike Christie 249480eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 249580eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 249680eb8761SMike Christie } 249780eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 249880eb8761SMike Christie 24992d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2500ee018252SBryant G. Ly { 2501ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2502ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2503ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2504ee018252SBryant G. Ly 2505ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2506ee018252SBryant G. Ly } 2507ee018252SBryant G. Ly 250802ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 250902ccfb54SZhu Lingshan const char *reconfig_data) 251002ccfb54SZhu Lingshan { 251102ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 251202ccfb54SZhu Lingshan void *msg_header = NULL; 251302ccfb54SZhu Lingshan int ret = 0; 251402ccfb54SZhu Lingshan 251502ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 251602ccfb54SZhu Lingshan &skb, &msg_header); 251702ccfb54SZhu Lingshan if (ret < 0) 251802ccfb54SZhu Lingshan return ret; 251902ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 252002ccfb54SZhu Lingshan if (ret < 0) { 252102ccfb54SZhu Lingshan nlmsg_free(skb); 252202ccfb54SZhu Lingshan return ret; 252302ccfb54SZhu Lingshan } 252402ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 252506add777SMike Christie skb, msg_header); 252602ccfb54SZhu Lingshan } 252702ccfb54SZhu Lingshan 252802ccfb54SZhu Lingshan 25292d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2530ee018252SBryant G. Ly size_t count) 2531ee018252SBryant G. Ly { 2532ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2533ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2534ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25352d76443eSMike Christie int ret, len; 2536ee018252SBryant G. Ly 25372d76443eSMike Christie len = strlen(page); 25382d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2539ee018252SBryant G. Ly return -EINVAL; 2540ee018252SBryant G. Ly 2541ee018252SBryant G. Ly /* Check if device has been configured before */ 254263d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 254302ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2544ee018252SBryant G. Ly if (ret) { 2545ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2546ee018252SBryant G. Ly return ret; 2547ee018252SBryant G. Ly } 2548de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2549de8c5221SBryant G. Ly 2550de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2551de8c5221SBryant G. Ly if (ret) 2552de8c5221SBryant G. Ly return ret; 2553de8c5221SBryant G. Ly return count; 2554ee018252SBryant G. Ly } 25552d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2556ee018252SBryant G. Ly 2557ee018252SBryant G. Ly return count; 2558ee018252SBryant G. Ly } 25592d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2560ee018252SBryant G. Ly 2561801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2562801fc54dSBryant G. Ly { 2563801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2564801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2565801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2566801fc54dSBryant G. Ly 25670e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2568801fc54dSBryant G. Ly } 2569801fc54dSBryant G. Ly 257084e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 257184e28506SZhu Lingshan { 257284e28506SZhu Lingshan struct sk_buff *skb = NULL; 257384e28506SZhu Lingshan void *msg_header = NULL; 257484e28506SZhu Lingshan int ret = 0; 257584e28506SZhu Lingshan 257684e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 257784e28506SZhu Lingshan &skb, &msg_header); 257884e28506SZhu Lingshan if (ret < 0) 257984e28506SZhu Lingshan return ret; 258084e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 258184e28506SZhu Lingshan size, TCMU_ATTR_PAD); 258284e28506SZhu Lingshan if (ret < 0) { 258384e28506SZhu Lingshan nlmsg_free(skb); 258484e28506SZhu Lingshan return ret; 258584e28506SZhu Lingshan } 258684e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 258706add777SMike Christie skb, msg_header); 258884e28506SZhu Lingshan } 258984e28506SZhu Lingshan 2590801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2591801fc54dSBryant G. Ly size_t count) 2592801fc54dSBryant G. Ly { 2593801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2594801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2595801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25962d76443eSMike Christie u64 val; 2597801fc54dSBryant G. Ly int ret; 2598801fc54dSBryant G. Ly 25992d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2600801fc54dSBryant G. Ly if (ret < 0) 2601801fc54dSBryant G. Ly return ret; 2602801fc54dSBryant G. Ly 2603801fc54dSBryant G. Ly /* Check if device has been configured before */ 260463d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 260584e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2606801fc54dSBryant G. Ly if (ret) { 2607801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2608801fc54dSBryant G. Ly return ret; 2609801fc54dSBryant G. Ly } 2610801fc54dSBryant G. Ly } 26112d76443eSMike Christie udev->dev_size = val; 2612801fc54dSBryant G. Ly return count; 2613801fc54dSBryant G. Ly } 2614801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2615801fc54dSBryant G. Ly 2616b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2617b849b456SKenjiro Nakayama char *page) 2618b849b456SKenjiro Nakayama { 2619b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2620b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2621b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2622b849b456SKenjiro Nakayama 2623b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2624b849b456SKenjiro Nakayama } 2625b849b456SKenjiro Nakayama 2626b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2627b849b456SKenjiro Nakayama const char *page, size_t count) 2628b849b456SKenjiro Nakayama { 2629b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2630b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2631b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2632b849b456SKenjiro Nakayama s8 val; 2633b849b456SKenjiro Nakayama int ret; 2634b849b456SKenjiro Nakayama 2635b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2636b849b456SKenjiro Nakayama if (ret < 0) 2637b849b456SKenjiro Nakayama return ret; 2638b849b456SKenjiro Nakayama 2639b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2640b849b456SKenjiro Nakayama return count; 2641b849b456SKenjiro Nakayama } 2642b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2643b849b456SKenjiro Nakayama 26449a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 26459a8bb606SBryant G. Ly char *page) 26469a8bb606SBryant G. Ly { 26479a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 26489a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 26499a8bb606SBryant G. Ly 26509a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 26519a8bb606SBryant G. Ly } 26529a8bb606SBryant G. Ly 265333d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 265433d065ccSZhu Lingshan { 265533d065ccSZhu Lingshan struct sk_buff *skb = NULL; 265633d065ccSZhu Lingshan void *msg_header = NULL; 265733d065ccSZhu Lingshan int ret = 0; 265833d065ccSZhu Lingshan 265933d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 266033d065ccSZhu Lingshan &skb, &msg_header); 266133d065ccSZhu Lingshan if (ret < 0) 266233d065ccSZhu Lingshan return ret; 266333d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 266433d065ccSZhu Lingshan if (ret < 0) { 266533d065ccSZhu Lingshan nlmsg_free(skb); 266633d065ccSZhu Lingshan return ret; 266733d065ccSZhu Lingshan } 266833d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 266906add777SMike Christie skb, msg_header); 267033d065ccSZhu Lingshan } 267133d065ccSZhu Lingshan 26729a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 26739a8bb606SBryant G. Ly const char *page, size_t count) 26749a8bb606SBryant G. Ly { 26759a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 26769a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 26771068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 26782d76443eSMike Christie u8 val; 26799a8bb606SBryant G. Ly int ret; 26809a8bb606SBryant G. Ly 26812d76443eSMike Christie ret = kstrtou8(page, 0, &val); 26829a8bb606SBryant G. Ly if (ret < 0) 26839a8bb606SBryant G. Ly return ret; 26849a8bb606SBryant G. Ly 26851068be7bSBryant G. Ly /* Check if device has been configured before */ 268663d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 268733d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 26881068be7bSBryant G. Ly if (ret) { 26891068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 26901068be7bSBryant G. Ly return ret; 26911068be7bSBryant G. Ly } 26921068be7bSBryant G. Ly } 26932d76443eSMike Christie 26942d76443eSMike Christie da->emulate_write_cache = val; 26959a8bb606SBryant G. Ly return count; 26969a8bb606SBryant G. Ly } 26979a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 26989a8bb606SBryant G. Ly 269959526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) 270059526d7aSBodo Stroesser { 270159526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 270259526d7aSBodo Stroesser struct se_dev_attrib, da_group); 270359526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 270459526d7aSBodo Stroesser 270559526d7aSBodo Stroesser return snprintf(page, PAGE_SIZE, "%i\n", 270659526d7aSBodo Stroesser test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); 270759526d7aSBodo Stroesser } 270859526d7aSBodo Stroesser 270959526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_store(struct config_item *item, 271059526d7aSBodo Stroesser const char *page, size_t count) 271159526d7aSBodo Stroesser { 271259526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 271359526d7aSBodo Stroesser struct se_dev_attrib, da_group); 271459526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 271559526d7aSBodo Stroesser u8 val; 271659526d7aSBodo Stroesser int ret; 271759526d7aSBodo Stroesser 271859526d7aSBodo Stroesser ret = kstrtou8(page, 0, &val); 271959526d7aSBodo Stroesser if (ret < 0) 272059526d7aSBodo Stroesser return ret; 272159526d7aSBodo Stroesser if (val > 1) 272259526d7aSBodo Stroesser return -EINVAL; 272359526d7aSBodo Stroesser 272459526d7aSBodo Stroesser if (val) 272559526d7aSBodo Stroesser set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 272659526d7aSBodo Stroesser else 272759526d7aSBodo Stroesser clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 272859526d7aSBodo Stroesser return count; 272959526d7aSBodo Stroesser } 273059526d7aSBodo Stroesser CONFIGFS_ATTR(tcmu_, tmr_notification); 273159526d7aSBodo Stroesser 2732892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2733892782caSMike Christie { 2734892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2735892782caSMike Christie struct se_device, 2736892782caSMike Christie dev_action_group); 2737892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2738892782caSMike Christie 2739892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2740892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2741892782caSMike Christie else 2742892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2743892782caSMike Christie } 2744892782caSMike Christie 2745892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2746892782caSMike Christie size_t count) 2747892782caSMike Christie { 2748892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2749892782caSMike Christie struct se_device, 2750892782caSMike Christie dev_action_group); 2751892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2752892782caSMike Christie u8 val; 2753892782caSMike Christie int ret; 2754892782caSMike Christie 2755a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2756a30b0473SMike Christie pr_err("Device is not configured.\n"); 2757a30b0473SMike Christie return -EINVAL; 2758a30b0473SMike Christie } 2759a30b0473SMike Christie 2760892782caSMike Christie ret = kstrtou8(page, 0, &val); 2761892782caSMike Christie if (ret < 0) 2762892782caSMike Christie return ret; 2763892782caSMike Christie 2764892782caSMike Christie if (val > 1) { 2765892782caSMike Christie pr_err("Invalid block value %d\n", val); 2766892782caSMike Christie return -EINVAL; 2767892782caSMike Christie } 2768892782caSMike Christie 2769892782caSMike Christie if (!val) 2770892782caSMike Christie tcmu_unblock_dev(udev); 2771892782caSMike Christie else 2772892782caSMike Christie tcmu_block_dev(udev); 2773892782caSMike Christie return count; 2774892782caSMike Christie } 2775892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2776892782caSMike Christie 2777892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2778892782caSMike Christie size_t count) 2779892782caSMike Christie { 2780892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2781892782caSMike Christie struct se_device, 2782892782caSMike Christie dev_action_group); 2783892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2784892782caSMike Christie u8 val; 2785892782caSMike Christie int ret; 2786892782caSMike Christie 2787a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2788a30b0473SMike Christie pr_err("Device is not configured.\n"); 2789a30b0473SMike Christie return -EINVAL; 2790a30b0473SMike Christie } 2791a30b0473SMike Christie 2792892782caSMike Christie ret = kstrtou8(page, 0, &val); 2793892782caSMike Christie if (ret < 0) 2794892782caSMike Christie return ret; 2795892782caSMike Christie 2796892782caSMike Christie if (val != 1 && val != 2) { 2797892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2798892782caSMike Christie return -EINVAL; 2799892782caSMike Christie } 2800892782caSMike Christie 2801892782caSMike Christie tcmu_reset_ring(udev, val); 2802892782caSMike Christie return count; 2803892782caSMike Christie } 2804892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2805892782caSMike Christie 28065821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2807801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 28089103575aSMike Christie &tcmu_attr_qfull_time_out, 280980eb8761SMike Christie &tcmu_attr_max_data_area_mb, 28102d76443eSMike Christie &tcmu_attr_dev_config, 2811801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2812801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 281359526d7aSBodo Stroesser &tcmu_attr_tmr_notification, 2814b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2815801fc54dSBryant G. Ly NULL, 2816801fc54dSBryant G. Ly }; 2817801fc54dSBryant G. Ly 28187d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 28197d7a7435SNicholas Bellinger 2820892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2821892782caSMike Christie &tcmu_attr_block_dev, 2822892782caSMike Christie &tcmu_attr_reset_ring, 2823892782caSMike Christie NULL, 2824892782caSMike Christie }; 2825892782caSMike Christie 28267d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 28277c9e7a6fSAndy Grover .name = "user", 28287c9e7a6fSAndy Grover .owner = THIS_MODULE, 282969088a04SBodo Stroesser .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, 2830356ba2a8SBodo Stroesser .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | 2831356ba2a8SBodo Stroesser TRANSPORT_FLAG_PASSTHROUGH_ALUA, 28327c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 28337c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 28347c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 28357c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 283692634706SMike Christie .destroy_device = tcmu_destroy_device, 28377c9e7a6fSAndy Grover .free_device = tcmu_free_device, 28387c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 2839bc2d214aSBodo Stroesser .tmr_notify = tcmu_tmr_notify, 28407c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 28417c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 28427c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 28437c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2844892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 28457c9e7a6fSAndy Grover }; 28467c9e7a6fSAndy Grover 284789ec9cfdSMike Christie static void find_free_blocks(void) 2848b6df4b79SXiubo Li { 2849b6df4b79SXiubo Li struct tcmu_dev *udev; 2850b6df4b79SXiubo Li loff_t off; 2851af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2852af1dd7ffSMike Christie 285380eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2854af1dd7ffSMike Christie return; 2855b6df4b79SXiubo Li 2856b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2857b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2858b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2859b6df4b79SXiubo Li 2860dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2861dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2862dc335a99SMike Christie continue; 2863dc335a99SMike Christie } 2864dc335a99SMike Christie 2865b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2866bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 2867bc2d214aSBodo Stroesser run_qfull_queue(udev, false); 2868b6df4b79SXiubo Li 2869af1dd7ffSMike Christie /* Skip the udevs in idle */ 2870af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2871b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2872b6df4b79SXiubo Li continue; 2873b6df4b79SXiubo Li } 2874b6df4b79SXiubo Li 2875b6df4b79SXiubo Li end = udev->dbi_max + 1; 2876b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2877b6df4b79SXiubo Li if (block == udev->dbi_max) { 2878b6df4b79SXiubo Li /* 2879af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2880af1dd7ffSMike Christie * reclaim any blocks. 2881b6df4b79SXiubo Li */ 2882b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2883b6df4b79SXiubo Li continue; 2884b6df4b79SXiubo Li } else if (block == end) { 2885b6df4b79SXiubo Li /* The current udev will goto idle state */ 2886b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2887b6df4b79SXiubo Li udev->dbi_max = 0; 2888b6df4b79SXiubo Li } else { 2889b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2890b6df4b79SXiubo Li udev->dbi_max = block; 2891b6df4b79SXiubo Li } 2892b6df4b79SXiubo Li 2893b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2894b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2895b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2896b6df4b79SXiubo Li 2897b6df4b79SXiubo Li /* Release the block pages */ 2898bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2899b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2900af1dd7ffSMike Christie 2901af1dd7ffSMike Christie total_freed += end - start; 2902af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2903af1dd7ffSMike Christie total_freed, udev->name); 2904b6df4b79SXiubo Li } 290589ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 290689ec9cfdSMike Christie 290780eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2908af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2909b6df4b79SXiubo Li } 2910b6df4b79SXiubo Li 2911488ebe4cSMike Christie static void check_timedout_devices(void) 2912488ebe4cSMike Christie { 2913488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 291461fb2482SBodo Stroesser struct tcmu_cmd *cmd, *tmp_cmd; 2915488ebe4cSMike Christie LIST_HEAD(devs); 2916488ebe4cSMike Christie 2917488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2918488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2919488ebe4cSMike Christie 2920488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2921488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2922488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2923488ebe4cSMike Christie 29246fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2925a94a2572SXiubo Li 292661fb2482SBodo Stroesser /* 292761fb2482SBodo Stroesser * If cmd_time_out is disabled but qfull is set deadline 292861fb2482SBodo Stroesser * will only reflect the qfull timeout. Ignore it. 292961fb2482SBodo Stroesser */ 293061fb2482SBodo Stroesser if (udev->cmd_time_out) { 293161fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, 293261fb2482SBodo Stroesser &udev->inflight_queue, 293361fb2482SBodo Stroesser queue_entry) { 293461fb2482SBodo Stroesser tcmu_check_expired_ring_cmd(cmd); 293561fb2482SBodo Stroesser } 293661fb2482SBodo Stroesser tcmu_set_next_deadline(&udev->inflight_queue, 293761fb2482SBodo Stroesser &udev->cmd_timer); 293861fb2482SBodo Stroesser } 293961fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, 294061fb2482SBodo Stroesser queue_entry) { 294161fb2482SBodo Stroesser tcmu_check_expired_queue_cmd(cmd); 294261fb2482SBodo Stroesser } 2943a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2944a94a2572SXiubo Li 29456fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2946488ebe4cSMike Christie 2947488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2948488ebe4cSMike Christie } 2949488ebe4cSMike Christie 2950488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2951488ebe4cSMike Christie } 2952488ebe4cSMike Christie 29539972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 295489ec9cfdSMike Christie { 2955488ebe4cSMike Christie check_timedout_devices(); 295689ec9cfdSMike Christie find_free_blocks(); 295789ec9cfdSMike Christie } 295889ec9cfdSMike Christie 29597c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 29607c9e7a6fSAndy Grover { 2961801fc54dSBryant G. Ly int ret, i, k, len = 0; 29627c9e7a6fSAndy Grover 29637c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 29647c9e7a6fSAndy Grover 2965af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 29669972cebbSMike Christie 29677c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 29687c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 29697c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 29707c9e7a6fSAndy Grover 0, NULL); 29717c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 29727c9e7a6fSAndy Grover return -ENOMEM; 29737c9e7a6fSAndy Grover 29747c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 29757c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 29767c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 29777c9e7a6fSAndy Grover goto out_free_cache; 29787c9e7a6fSAndy Grover } 29797c9e7a6fSAndy Grover 29807c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 29817c9e7a6fSAndy Grover if (ret < 0) { 29827c9e7a6fSAndy Grover goto out_unreg_device; 29837c9e7a6fSAndy Grover } 29847c9e7a6fSAndy Grover 29854703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 29867d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 29874703b625SBodo Stroesser for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) 2988801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 29894703b625SBodo Stroesser for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) 29904703b625SBodo Stroesser len += sizeof(struct configfs_attribute *); 2991801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 29927d7a7435SNicholas Bellinger 29937d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 29947d7a7435SNicholas Bellinger if (!tcmu_attrs) { 29957d7a7435SNicholas Bellinger ret = -ENOMEM; 29967d7a7435SNicholas Bellinger goto out_unreg_genl; 29977d7a7435SNicholas Bellinger } 29987d7a7435SNicholas Bellinger 29994703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 30007d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 30014703b625SBodo Stroesser for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) 30024703b625SBodo Stroesser tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; 30034703b625SBodo Stroesser for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) 30044703b625SBodo Stroesser tcmu_attrs[i++] = tcmu_attrib_attrs[k]; 30057d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 30067d7a7435SNicholas Bellinger 30070a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 30087c9e7a6fSAndy Grover if (ret) 30097d7a7435SNicholas Bellinger goto out_attrs; 30107c9e7a6fSAndy Grover 30117c9e7a6fSAndy Grover return 0; 30127c9e7a6fSAndy Grover 30137d7a7435SNicholas Bellinger out_attrs: 30147d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30157c9e7a6fSAndy Grover out_unreg_genl: 30167c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30177c9e7a6fSAndy Grover out_unreg_device: 30187c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30197c9e7a6fSAndy Grover out_free_cache: 30207c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30217c9e7a6fSAndy Grover 30227c9e7a6fSAndy Grover return ret; 30237c9e7a6fSAndy Grover } 30247c9e7a6fSAndy Grover 30257c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 30267c9e7a6fSAndy Grover { 3027af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 30280a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 30297d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30307c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30317c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30327c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30337c9e7a6fSAndy Grover } 30347c9e7a6fSAndy Grover 30357c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 30367c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 30377c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 30387c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 30397c9e7a6fSAndy Grover 30407c9e7a6fSAndy Grover module_init(tcmu_module_init); 30417c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 3042