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> 11ba929992SBart Van Assche #include <linux/kernel.h> 127c9e7a6fSAndy Grover #include <linux/timer.h> 137c9e7a6fSAndy Grover #include <linux/parser.h> 145538d294SDavid S. Miller #include <linux/vmalloc.h> 157c9e7a6fSAndy Grover #include <linux/uio_driver.h> 16d3cbb743SBodo Stroesser #include <linux/xarray.h> 17ac64a2ceSDavid Disseldorp #include <linux/stringify.h> 1826418649SSheng Yang #include <linux/bitops.h> 19f5045724SBart Van Assche #include <linux/highmem.h> 207d7a7435SNicholas Bellinger #include <linux/configfs.h> 21b6df4b79SXiubo Li #include <linux/mutex.h> 229972cebbSMike Christie #include <linux/workqueue.h> 237c9e7a6fSAndy Grover #include <net/genetlink.h> 24ba929992SBart Van Assche #include <scsi/scsi_common.h> 25ba929992SBart Van Assche #include <scsi/scsi_proto.h> 267c9e7a6fSAndy Grover #include <target/target_core_base.h> 277c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 287c9e7a6fSAndy Grover #include <target/target_core_backend.h> 29e9f720d6SNicholas Bellinger 307c9e7a6fSAndy Grover #include <linux/target_core_user.h> 317c9e7a6fSAndy Grover 32572ccdabSRandy Dunlap /** 33572ccdabSRandy Dunlap * DOC: Userspace I/O 34572ccdabSRandy Dunlap * Userspace I/O 35572ccdabSRandy Dunlap * ------------- 36572ccdabSRandy Dunlap * 377c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 387c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 397c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 407c9e7a6fSAndy Grover * 417c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 427c9e7a6fSAndy Grover * introspection work for us. 437c9e7a6fSAndy Grover * 447c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 457c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 467c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 47572ccdabSRandy Dunlap * internal to the mmap-ed area. There is separate space outside the 487c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 497c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 507c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 517c9e7a6fSAndy Grover * 527c9e7a6fSAndy Grover * SECURITY: 537c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 547c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 557c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 567c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 577c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 587c9e7a6fSAndy Grover * this may have a 'UAM' comment. 597c9e7a6fSAndy Grover */ 607c9e7a6fSAndy Grover 617c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 627c9e7a6fSAndy Grover 63b6df4b79SXiubo Li /* For cmd area, the size is fixed 8MB */ 64b6df4b79SXiubo Li #define CMDR_SIZE (8 * 1024 * 1024) 6526418649SSheng Yang 66b6df4b79SXiubo Li /* 67b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 68b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 69b6df4b79SXiubo Li */ 70b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 7180eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 7280eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 737c9e7a6fSAndy Grover 7480eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 7580eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 7680eb8761SMike Christie 77af1dd7ffSMike Christie /* 78af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 79af1dd7ffSMike Christie * when the unmap thread will be started. 80af1dd7ffSMike Christie */ 8180eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 82b6df4b79SXiubo Li 83b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 84bdaeedc1SMike Christie static u8 tcmu_netlink_blocked; 85b3af66e2SMike Christie 867c9e7a6fSAndy Grover static struct device *tcmu_root_device; 877c9e7a6fSAndy Grover 887c9e7a6fSAndy Grover struct tcmu_hba { 897c9e7a6fSAndy Grover u32 host_id; 907c9e7a6fSAndy Grover }; 917c9e7a6fSAndy Grover 927c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 937c9e7a6fSAndy Grover 943228691fSMike Christie static DEFINE_MUTEX(tcmu_nl_cmd_mutex); 953228691fSMike Christie static LIST_HEAD(tcmu_nl_cmd_list); 963228691fSMike Christie 973228691fSMike Christie struct tcmu_dev; 983228691fSMike Christie 99b3af66e2SMike Christie struct tcmu_nl_cmd { 100b3af66e2SMike Christie /* wake up thread waiting for reply */ 101b3af66e2SMike Christie struct completion complete; 1023228691fSMike Christie struct list_head nl_list; 1033228691fSMike Christie struct tcmu_dev *udev; 104b3af66e2SMike Christie int cmd; 105b3af66e2SMike Christie int status; 106b3af66e2SMike Christie }; 107b3af66e2SMike Christie 1087c9e7a6fSAndy Grover struct tcmu_dev { 109b6df4b79SXiubo Li struct list_head node; 110f3cdbe39SMike Christie struct kref kref; 111af1dd7ffSMike Christie 1127c9e7a6fSAndy Grover struct se_device se_dev; 1136888da81SMike Christie struct se_dev_plug se_plug; 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 1226888da81SMike Christie #define TCM_DEV_BIT_PLUGGED 4 1237c9e7a6fSAndy Grover unsigned long flags; 1247c9e7a6fSAndy Grover 1257c9e7a6fSAndy Grover struct uio_info uio_info; 1267c9e7a6fSAndy Grover 127b6df4b79SXiubo Li struct inode *inode; 128b6df4b79SXiubo Li 1297c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1300e0d7526SMike Christie uint64_t dev_size; 1317c9e7a6fSAndy Grover u32 cmdr_size; 1327c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1333d9b9555SAndy Grover /* Offset of data area from start of mb */ 13426418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1357c9e7a6fSAndy Grover size_t data_off; 1367c9e7a6fSAndy Grover size_t data_size; 13780eb8761SMike Christie uint32_t max_blocks; 13880eb8761SMike Christie size_t ring_size; 13926418649SSheng Yang 140b6df4b79SXiubo Li struct mutex cmdr_lock; 141a94a2572SXiubo Li struct list_head qfull_queue; 142bc2d214aSBodo Stroesser struct list_head tmr_queue; 1437c9e7a6fSAndy Grover 144141685a3SXiubo Li uint32_t dbi_max; 145b6df4b79SXiubo Li uint32_t dbi_thresh; 14680eb8761SMike Christie unsigned long *data_bitmap; 147*f7c89771SBodo Stroesser struct xarray data_blocks; 148141685a3SXiubo Li 149d3cbb743SBodo Stroesser struct xarray commands; 1507c9e7a6fSAndy Grover 1519103575aSMike Christie struct timer_list cmd_timer; 152af980e46SMike Christie unsigned int cmd_time_out; 153a94a2572SXiubo Li struct list_head inflight_queue; 1549103575aSMike Christie 1559103575aSMike Christie struct timer_list qfull_timer; 1569103575aSMike Christie int qfull_time_out; 1579103575aSMike Christie 158488ebe4cSMike Christie struct list_head timedout_entry; 1597c9e7a6fSAndy Grover 160b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 161b3af66e2SMike Christie 1627c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 163b849b456SKenjiro Nakayama 164b849b456SKenjiro Nakayama int nl_reply_supported; 1657c9e7a6fSAndy Grover }; 1667c9e7a6fSAndy Grover 1677c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1687c9e7a6fSAndy Grover 1697c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1707c9e7a6fSAndy Grover 1717c9e7a6fSAndy Grover struct tcmu_cmd { 1727c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1737c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 174a94a2572SXiubo Li struct list_head queue_entry; 1757c9e7a6fSAndy Grover 1767c9e7a6fSAndy Grover uint16_t cmd_id; 1777c9e7a6fSAndy Grover 17826418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1797c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 180141685a3SXiubo Li uint32_t dbi_cnt; 18152ef2743SBodo Stroesser uint32_t dbi_bidi_cnt; 182141685a3SXiubo Li uint32_t dbi_cur; 183141685a3SXiubo Li uint32_t *dbi; 1847c9e7a6fSAndy Grover 1853c9a7c58SBodo Stroesser uint32_t data_len_bidi; 1863c9a7c58SBodo Stroesser 1877c9e7a6fSAndy Grover unsigned long deadline; 1887c9e7a6fSAndy Grover 1897c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1907c9e7a6fSAndy Grover unsigned long flags; 1917c9e7a6fSAndy Grover }; 192bc2d214aSBodo Stroesser 193bc2d214aSBodo Stroesser struct tcmu_tmr { 194bc2d214aSBodo Stroesser struct list_head queue_entry; 195bc2d214aSBodo Stroesser 196bc2d214aSBodo Stroesser uint8_t tmr_type; 197bc2d214aSBodo Stroesser uint32_t tmr_cmd_cnt; 1988fdaabe1SGustavo A. R. Silva int16_t tmr_cmd_ids[]; 199bc2d214aSBodo Stroesser }; 200bc2d214aSBodo Stroesser 201af1dd7ffSMike Christie /* 202af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 203af1dd7ffSMike Christie * 204af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 205af1dd7ffSMike Christie * ... 206af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 207af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 208af1dd7ffSMike Christie * ... 209af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 210af1dd7ffSMike Christie */ 211b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 212b6df4b79SXiubo Li static LIST_HEAD(root_udev); 213b6df4b79SXiubo Li 214488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 215488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 216488ebe4cSMike Christie 21780eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 21880eb8761SMike Christie 219b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 220af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 22180eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 222b6df4b79SXiubo Li 22380eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 22480eb8761SMike Christie const struct kernel_param *kp) 22580eb8761SMike Christie { 22680eb8761SMike Christie int ret, max_area_mb; 22780eb8761SMike Christie 22880eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 22980eb8761SMike Christie if (ret) 23080eb8761SMike Christie return -EINVAL; 23180eb8761SMike Christie 23280eb8761SMike Christie if (max_area_mb <= 0) { 23380eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 23480eb8761SMike Christie return -EINVAL; 23580eb8761SMike Christie } 23680eb8761SMike Christie 23780eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 23880eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 23980eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 24080eb8761SMike Christie else 24180eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 24280eb8761SMike Christie 24380eb8761SMike Christie return 0; 24480eb8761SMike Christie } 24580eb8761SMike Christie 24680eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 24780eb8761SMike Christie const struct kernel_param *kp) 24880eb8761SMike Christie { 2496d70cb34SXiongfeng Wang return sprintf(buffer, "%d\n", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 25080eb8761SMike Christie } 25180eb8761SMike Christie 25280eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 25380eb8761SMike Christie .set = tcmu_set_global_max_data_area, 25480eb8761SMike Christie .get = tcmu_get_global_max_data_area, 25580eb8761SMike Christie }; 25680eb8761SMike Christie 25780eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 25880eb8761SMike Christie S_IWUSR | S_IRUGO); 25980eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 26080eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 26180eb8761SMike Christie "data areas."); 2627c9e7a6fSAndy Grover 263bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 264bdaeedc1SMike Christie const struct kernel_param *kp) 265bdaeedc1SMike Christie { 266bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 267bdaeedc1SMike Christie "blocked" : "unblocked"); 268bdaeedc1SMike Christie } 269bdaeedc1SMike Christie 270bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 271bdaeedc1SMike Christie const struct kernel_param *kp) 272bdaeedc1SMike Christie { 273bdaeedc1SMike Christie int ret; 274bdaeedc1SMike Christie u8 val; 275bdaeedc1SMike Christie 276bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 277bdaeedc1SMike Christie if (ret < 0) 278bdaeedc1SMike Christie return ret; 279bdaeedc1SMike Christie 280bdaeedc1SMike Christie if (val > 1) { 281bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 282bdaeedc1SMike Christie return -EINVAL; 283bdaeedc1SMike Christie } 284bdaeedc1SMike Christie 285bdaeedc1SMike Christie tcmu_netlink_blocked = val; 286bdaeedc1SMike Christie return 0; 287bdaeedc1SMike Christie } 288bdaeedc1SMike Christie 289bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 290bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 291bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 292bdaeedc1SMike Christie }; 293bdaeedc1SMike Christie 294bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 295bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 296bdaeedc1SMike Christie 297bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 298bdaeedc1SMike Christie { 299bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 300bdaeedc1SMike Christie 301bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 302bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 303bdaeedc1SMike Christie return -EBUSY; 304bdaeedc1SMike Christie } 305bdaeedc1SMike Christie 306bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 307bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 308bdaeedc1SMike Christie nl_cmd->status = -EINTR; 309bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 310bdaeedc1SMike Christie complete(&nl_cmd->complete); 311bdaeedc1SMike Christie } 312bdaeedc1SMike Christie return 0; 313bdaeedc1SMike Christie } 314bdaeedc1SMike Christie 315bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 316bdaeedc1SMike Christie const struct kernel_param *kp) 317bdaeedc1SMike Christie { 318bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 319bdaeedc1SMike Christie int ret; 320bdaeedc1SMike Christie u8 val; 321bdaeedc1SMike Christie 322bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 323bdaeedc1SMike Christie if (ret < 0) 324bdaeedc1SMike Christie return ret; 325bdaeedc1SMike Christie 326bdaeedc1SMike Christie if (val != 1) { 327bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 328bdaeedc1SMike Christie return -EINVAL; 329bdaeedc1SMike Christie } 330bdaeedc1SMike Christie 331bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 332bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 333bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 334bdaeedc1SMike Christie if (ret) 335bdaeedc1SMike Christie break; 336bdaeedc1SMike Christie } 337bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 338bdaeedc1SMike Christie 339bdaeedc1SMike Christie return ret; 340bdaeedc1SMike Christie } 341bdaeedc1SMike Christie 342bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 343bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 344bdaeedc1SMike Christie }; 345bdaeedc1SMike Christie 346bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 347bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 348bdaeedc1SMike Christie 3497c9e7a6fSAndy Grover /* multicast group */ 3507c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3517c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3527c9e7a6fSAndy Grover }; 3537c9e7a6fSAndy Grover 3547c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3557c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3567c9e7a6fSAndy Grover }; 3577c9e7a6fSAndy Grover 358b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 359b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 360b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 361b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 362b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 363b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 364b3af66e2SMike Christie }; 365b3af66e2SMike Christie 366b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 367b3af66e2SMike Christie { 3683228691fSMike Christie struct tcmu_dev *udev = NULL; 369b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 370b3af66e2SMike Christie int dev_id, rc, ret = 0; 371b3af66e2SMike Christie 372b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 373b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 374b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 375b3af66e2SMike Christie return -EINVAL; 376b3af66e2SMike Christie } 377b3af66e2SMike Christie 378b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 379b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 380b3af66e2SMike Christie 3813228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3823228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3833228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3843228691fSMike Christie udev = nl_cmd->udev; 3853228691fSMike Christie break; 386b3af66e2SMike Christie } 3873228691fSMike Christie } 388b3af66e2SMike Christie 3893228691fSMike Christie if (!udev) { 3900c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3913228691fSMike Christie completed_cmd, rc, dev_id); 3923228691fSMike Christie ret = -ENODEV; 3933228691fSMike Christie goto unlock; 3943228691fSMike Christie } 3953228691fSMike Christie list_del(&nl_cmd->nl_list); 396b3af66e2SMike Christie 397bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 398bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 399bdaeedc1SMike Christie nl_cmd->status); 400b3af66e2SMike Christie 401b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 4023228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 4033228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 404b3af66e2SMike Christie ret = -EINVAL; 4053228691fSMike Christie goto unlock; 406b3af66e2SMike Christie } 407b3af66e2SMike Christie 4083228691fSMike Christie nl_cmd->status = rc; 409b3af66e2SMike Christie complete(&nl_cmd->complete); 4103228691fSMike Christie unlock: 4113228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 412b3af66e2SMike Christie return ret; 413b3af66e2SMike Christie } 414b3af66e2SMike Christie 415b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 416b3af66e2SMike Christie { 417b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 418b3af66e2SMike Christie } 419b3af66e2SMike Christie 420b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 421b3af66e2SMike Christie { 422b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 423b3af66e2SMike Christie } 424b3af66e2SMike Christie 425b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 426b3af66e2SMike Christie struct genl_info *info) 427b3af66e2SMike Christie { 428b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 429b3af66e2SMike Christie } 430b3af66e2SMike Christie 431b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 432b3af66e2SMike Christie { 433b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 434b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 435b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 436b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 437b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 438b3af66e2SMike Christie } 439b3af66e2SMike Christie 440b3af66e2SMike Christie return 0; 441b3af66e2SMike Christie } 442b3af66e2SMike Christie 44366a9b928SJakub Kicinski static const struct genl_small_ops tcmu_genl_ops[] = { 444b3af66e2SMike Christie { 445b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 446ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 447b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 448b3af66e2SMike Christie .doit = tcmu_genl_set_features, 449b3af66e2SMike Christie }, 450b3af66e2SMike Christie { 451b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 452ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 453b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 454b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 455b3af66e2SMike Christie }, 456b3af66e2SMike Christie { 457b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 458ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 459b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 460b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 461b3af66e2SMike Christie }, 462b3af66e2SMike Christie { 463b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 464ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 465b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 466b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 467b3af66e2SMike Christie }, 468b3af66e2SMike Christie }; 469b3af66e2SMike Christie 4707c9e7a6fSAndy Grover /* Our generic netlink family */ 47156989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 472489111e5SJohannes Berg .module = THIS_MODULE, 4737c9e7a6fSAndy Grover .hdrsize = 0, 4747c9e7a6fSAndy Grover .name = "TCM-USER", 475b3af66e2SMike Christie .version = 2, 4767c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4773b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4787c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4797c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 48020c08b36SSheng Yang .netnsok = true, 48166a9b928SJakub Kicinski .small_ops = tcmu_genl_ops, 48266a9b928SJakub Kicinski .n_small_ops = ARRAY_SIZE(tcmu_genl_ops), 4837c9e7a6fSAndy Grover }; 4847c9e7a6fSAndy Grover 485141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 486141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 487141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 488141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 489141685a3SXiubo Li 490b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 491141685a3SXiubo Li { 492141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 493141685a3SXiubo Li uint32_t i; 494141685a3SXiubo Li 495b6df4b79SXiubo Li for (i = 0; i < len; i++) 496141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 497141685a3SXiubo Li } 498141685a3SXiubo Li 4997e98905eSBodo Stroesser static inline int tcmu_get_empty_block(struct tcmu_dev *udev, 5007e98905eSBodo Stroesser struct tcmu_cmd *tcmu_cmd, 5017e98905eSBodo Stroesser int prev_dbi, int *iov_cnt) 502141685a3SXiubo Li { 503b6df4b79SXiubo Li struct page *page; 504*f7c89771SBodo Stroesser int dbi; 505141685a3SXiubo Li 506b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 507b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 5087e98905eSBodo Stroesser return -1; 509b6df4b79SXiubo Li 510*f7c89771SBodo Stroesser page = xa_load(&udev->data_blocks, dbi); 511b6df4b79SXiubo Li if (!page) { 512b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 51380eb8761SMike Christie tcmu_global_max_blocks) 514af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 515b6df4b79SXiubo Li 516b6df4b79SXiubo Li /* try to get new page from the mm */ 5170eccce86SDamien Le Moal page = alloc_page(GFP_NOIO); 518b6df4b79SXiubo Li if (!page) 519daf78c30SXiubo Li goto err_alloc; 520b6df4b79SXiubo Li 521*f7c89771SBodo Stroesser if (xa_store(&udev->data_blocks, dbi, page, GFP_KERNEL)) 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 { 560*f7c89771SBodo Stroesser return xa_load(&udev->data_blocks, dbi); 561141685a3SXiubo Li } 562141685a3SXiubo Li 563141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 564141685a3SXiubo Li { 565141685a3SXiubo Li kfree(tcmu_cmd->dbi); 566141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 567141685a3SXiubo Li } 568141685a3SXiubo Li 56952ef2743SBodo Stroesser static inline void tcmu_cmd_set_block_cnts(struct tcmu_cmd *cmd) 570141685a3SXiubo Li { 57152ef2743SBodo Stroesser int i, len; 57252ef2743SBodo Stroesser struct se_cmd *se_cmd = cmd->se_cmd; 57352ef2743SBodo Stroesser 57452ef2743SBodo Stroesser cmd->dbi_cnt = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 575141685a3SXiubo Li 576141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 577141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 57852ef2743SBodo Stroesser for (i = 0, len = 0; i < se_cmd->t_bidi_data_nents; i++) 57952ef2743SBodo Stroesser len += se_cmd->t_bidi_data_sg[i].length; 58052ef2743SBodo Stroesser cmd->dbi_bidi_cnt = DIV_ROUND_UP(len, DATA_BLOCK_SIZE); 58152ef2743SBodo Stroesser cmd->dbi_cnt += cmd->dbi_bidi_cnt; 5823c9a7c58SBodo Stroesser cmd->data_len_bidi = len; 583141685a3SXiubo Li } 584141685a3SXiubo Li } 585141685a3SXiubo Li 5863c9a7c58SBodo Stroesser static int new_block_to_iov(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 587c8ed1ff8SBodo Stroesser struct iovec **iov, int prev_dbi, int len) 5883c9a7c58SBodo Stroesser { 5893c9a7c58SBodo Stroesser /* Get the next dbi */ 5903c9a7c58SBodo Stroesser int dbi = tcmu_cmd_get_dbi(cmd); 5913c9a7c58SBodo Stroesser 592c8ed1ff8SBodo Stroesser /* Do not add more than DATA_BLOCK_SIZE to iov */ 593c8ed1ff8SBodo Stroesser if (len > DATA_BLOCK_SIZE) 594c8ed1ff8SBodo Stroesser len = DATA_BLOCK_SIZE; 595c8ed1ff8SBodo Stroesser 5963c9a7c58SBodo Stroesser /* 5973c9a7c58SBodo Stroesser * The following code will gather and map the blocks to the same iovec 5983c9a7c58SBodo Stroesser * when the blocks are all next to each other. 5993c9a7c58SBodo Stroesser */ 6003c9a7c58SBodo Stroesser if (dbi != prev_dbi + 1) { 6013c9a7c58SBodo Stroesser /* dbi is not next to previous dbi, so start new iov */ 6023c9a7c58SBodo Stroesser if (prev_dbi >= 0) 6033c9a7c58SBodo Stroesser (*iov)++; 6043c9a7c58SBodo Stroesser /* write offset relative to mb_addr */ 6053c9a7c58SBodo Stroesser (*iov)->iov_base = (void __user *) 6063c9a7c58SBodo Stroesser (udev->data_off + dbi * DATA_BLOCK_SIZE); 6073c9a7c58SBodo Stroesser } 6083c9a7c58SBodo Stroesser (*iov)->iov_len += len; 6093c9a7c58SBodo Stroesser 6103c9a7c58SBodo Stroesser return dbi; 6113c9a7c58SBodo Stroesser } 6123c9a7c58SBodo Stroesser 6133c9a7c58SBodo Stroesser static void tcmu_setup_iovs(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 6143c9a7c58SBodo Stroesser struct iovec **iov, int data_length) 6153c9a7c58SBodo Stroesser { 6163c9a7c58SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 6173c9a7c58SBodo Stroesser int dbi = -2; 6183c9a7c58SBodo Stroesser 6193c9a7c58SBodo Stroesser /* We prepare the IOVs for DMA_FROM_DEVICE transfer direction */ 620c8ed1ff8SBodo Stroesser for (; data_length > 0; data_length -= DATA_BLOCK_SIZE) 621c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, cmd, iov, dbi, data_length); 6223c9a7c58SBodo Stroesser } 6233c9a7c58SBodo Stroesser 6247c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 6257c9e7a6fSAndy Grover { 6267c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 6277c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 6287c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 6297c9e7a6fSAndy Grover 6300eccce86SDamien Le Moal tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); 6317c9e7a6fSAndy Grover if (!tcmu_cmd) 6327c9e7a6fSAndy Grover return NULL; 6337c9e7a6fSAndy Grover 634a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 6357c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 6367c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 6377c9e7a6fSAndy Grover 63852ef2743SBodo Stroesser tcmu_cmd_set_block_cnts(tcmu_cmd); 639141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 6400eccce86SDamien Le Moal GFP_NOIO); 641141685a3SXiubo Li if (!tcmu_cmd->dbi) { 642141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 643141685a3SXiubo Li return NULL; 644141685a3SXiubo Li } 645141685a3SXiubo Li 6467c9e7a6fSAndy Grover return tcmu_cmd; 6477c9e7a6fSAndy Grover } 6487c9e7a6fSAndy Grover 6497c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 6507c9e7a6fSAndy Grover { 651b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 65226d2b310Stangwenji void *start = vaddr - offset; 6537c9e7a6fSAndy Grover 6547c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6557c9e7a6fSAndy Grover 6567c9e7a6fSAndy Grover while (size) { 6573145550aSBodo Stroesser flush_dcache_page(vmalloc_to_page(start)); 65826d2b310Stangwenji start += PAGE_SIZE; 6597c9e7a6fSAndy Grover size -= PAGE_SIZE; 6607c9e7a6fSAndy Grover } 6617c9e7a6fSAndy Grover } 6627c9e7a6fSAndy Grover 6637c9e7a6fSAndy Grover /* 6647c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6657c9e7a6fSAndy Grover * we can't use circ_buf.h. 6667c9e7a6fSAndy Grover */ 6677c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6687c9e7a6fSAndy Grover { 6697c9e7a6fSAndy Grover int diff = head - tail; 6707c9e7a6fSAndy Grover 6717c9e7a6fSAndy Grover if (diff >= 0) 6727c9e7a6fSAndy Grover return diff; 6737c9e7a6fSAndy Grover else 6747c9e7a6fSAndy Grover return size + diff; 6757c9e7a6fSAndy Grover } 6767c9e7a6fSAndy Grover 6777c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6787c9e7a6fSAndy Grover { 6797c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6807c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6817c9e7a6fSAndy Grover } 6827c9e7a6fSAndy Grover 6837c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6847c9e7a6fSAndy Grover { 6857c9e7a6fSAndy Grover return size - head; 6867c9e7a6fSAndy Grover } 6877c9e7a6fSAndy Grover 6887c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6897c9e7a6fSAndy Grover 690c8ed1ff8SBodo Stroesser #define TCMU_SG_TO_DATA_AREA 1 691c8ed1ff8SBodo Stroesser #define TCMU_DATA_AREA_TO_SG 2 692c8ed1ff8SBodo Stroesser 693c8ed1ff8SBodo Stroesser static inline void tcmu_copy_data(struct tcmu_dev *udev, 694c8ed1ff8SBodo Stroesser struct tcmu_cmd *tcmu_cmd, uint32_t direction, 695c8ed1ff8SBodo Stroesser struct scatterlist *sg, unsigned int sg_nents, 696c8ed1ff8SBodo Stroesser struct iovec **iov, size_t data_len) 697c8ed1ff8SBodo Stroesser { 698c8ed1ff8SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 699c8ed1ff8SBodo Stroesser int dbi = -2; 700c8ed1ff8SBodo Stroesser size_t block_remaining, cp_len; 701c8ed1ff8SBodo Stroesser struct sg_mapping_iter sg_iter; 702c8ed1ff8SBodo Stroesser unsigned int sg_flags; 703c8ed1ff8SBodo Stroesser struct page *page; 704c8ed1ff8SBodo Stroesser void *data_page_start, *data_addr; 705c8ed1ff8SBodo Stroesser 706c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 707c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_FROM_SG; 708c8ed1ff8SBodo Stroesser else 709c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; 710c8ed1ff8SBodo Stroesser sg_miter_start(&sg_iter, sg, sg_nents, sg_flags); 711c8ed1ff8SBodo Stroesser 712c8ed1ff8SBodo Stroesser while (data_len) { 713c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 714c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, tcmu_cmd, iov, dbi, 715c8ed1ff8SBodo Stroesser data_len); 716c8ed1ff8SBodo Stroesser else 717c8ed1ff8SBodo Stroesser dbi = tcmu_cmd_get_dbi(tcmu_cmd); 718c8ed1ff8SBodo Stroesser page = tcmu_get_block_page(udev, dbi); 719c8ed1ff8SBodo Stroesser if (direction == TCMU_DATA_AREA_TO_SG) 720c8ed1ff8SBodo Stroesser flush_dcache_page(page); 721c8ed1ff8SBodo Stroesser data_page_start = kmap_atomic(page); 722c8ed1ff8SBodo Stroesser block_remaining = DATA_BLOCK_SIZE; 723c8ed1ff8SBodo Stroesser 724c8ed1ff8SBodo Stroesser while (block_remaining && data_len) { 725c8ed1ff8SBodo Stroesser if (!sg_miter_next(&sg_iter)) { 726c8ed1ff8SBodo Stroesser /* set length to 0 to abort outer loop */ 727c8ed1ff8SBodo Stroesser data_len = 0; 728c8ed1ff8SBodo Stroesser pr_debug("tcmu_move_data: aborting data copy due to exhausted sg_list\n"); 729c8ed1ff8SBodo Stroesser break; 730c8ed1ff8SBodo Stroesser } 731c8ed1ff8SBodo Stroesser cp_len = min3(sg_iter.length, block_remaining, data_len); 732c8ed1ff8SBodo Stroesser 733c8ed1ff8SBodo Stroesser data_addr = data_page_start + 734c8ed1ff8SBodo Stroesser DATA_BLOCK_SIZE - block_remaining; 735c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 736c8ed1ff8SBodo Stroesser memcpy(data_addr, sg_iter.addr, cp_len); 737c8ed1ff8SBodo Stroesser else 738c8ed1ff8SBodo Stroesser memcpy(sg_iter.addr, data_addr, cp_len); 739c8ed1ff8SBodo Stroesser 740c8ed1ff8SBodo Stroesser data_len -= cp_len; 741c8ed1ff8SBodo Stroesser block_remaining -= cp_len; 742c8ed1ff8SBodo Stroesser sg_iter.consumed = cp_len; 743c8ed1ff8SBodo Stroesser } 744c8ed1ff8SBodo Stroesser sg_miter_stop(&sg_iter); 745c8ed1ff8SBodo Stroesser 746c8ed1ff8SBodo Stroesser kunmap_atomic(data_page_start); 747c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 748c8ed1ff8SBodo Stroesser flush_dcache_page(page); 749c8ed1ff8SBodo Stroesser } 750c8ed1ff8SBodo Stroesser } 751c8ed1ff8SBodo Stroesser 7523c9a7c58SBodo Stroesser static void scatter_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7533c9a7c58SBodo Stroesser struct iovec **iov) 75426418649SSheng Yang { 7553c9a7c58SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 756f97ec7dbSIlias Tsitsimpis 757c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_SG_TO_DATA_AREA, se_cmd->t_data_sg, 758c8ed1ff8SBodo Stroesser se_cmd->t_data_nents, iov, se_cmd->data_length); 7593c58f737SBodo Stroesser } 760b6df4b79SXiubo Li 761c8ed1ff8SBodo Stroesser static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7626c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 763f97ec7dbSIlias Tsitsimpis { 764c8ed1ff8SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 765c8ed1ff8SBodo Stroesser struct scatterlist *data_sg; 766a5d68ba8SXiubo Li unsigned int data_nents; 767a5d68ba8SXiubo Li 768a5d68ba8SXiubo Li if (!bidi) { 769a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 770a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 771a5d68ba8SXiubo Li } else { 772a5d68ba8SXiubo Li /* 773a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 774a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 77552ef2743SBodo Stroesser * the Data-Out buffer blocks should be skipped. 776a5d68ba8SXiubo Li */ 777c8ed1ff8SBodo Stroesser tcmu_cmd_set_dbi_cur(tcmu_cmd, 778c8ed1ff8SBodo Stroesser tcmu_cmd->dbi_cnt - tcmu_cmd->dbi_bidi_cnt); 779a5d68ba8SXiubo Li 780a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 781a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 782a5d68ba8SXiubo Li } 783f97ec7dbSIlias Tsitsimpis 784c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_DATA_AREA_TO_SG, data_sg, 785c8ed1ff8SBodo Stroesser data_nents, NULL, read_len); 786f97ec7dbSIlias Tsitsimpis } 787f97ec7dbSIlias Tsitsimpis 788b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 78926418649SSheng Yang { 7903c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 79126418649SSheng Yang } 79226418649SSheng Yang 7937c9e7a6fSAndy Grover /* 7947e98905eSBodo Stroesser * We can't queue a command until we have space available on the cmd ring. 7957c9e7a6fSAndy Grover * 7967c9e7a6fSAndy Grover * Called with ring lock held. 7977c9e7a6fSAndy Grover */ 7987e98905eSBodo Stroesser static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size) 7997c9e7a6fSAndy Grover { 8007c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 8010241fd39SNicholas Bellinger size_t space, cmd_needed; 8027c9e7a6fSAndy Grover u32 cmd_head; 8037c9e7a6fSAndy Grover 8047c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8057c9e7a6fSAndy Grover 8067c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8077c9e7a6fSAndy Grover 808f56574a2SAndy Grover /* 809f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 810f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 811f56574a2SAndy Grover */ 812f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 813f56574a2SAndy Grover cmd_needed = cmd_size; 814f56574a2SAndy Grover else 815f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 816f56574a2SAndy Grover 8177c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8187c9e7a6fSAndy Grover if (space < cmd_needed) { 8197c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8207c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8217c9e7a6fSAndy Grover return false; 8227c9e7a6fSAndy Grover } 823bc2d214aSBodo Stroesser return true; 8247e98905eSBodo Stroesser } 8257e98905eSBodo Stroesser 8267e98905eSBodo Stroesser /* 8277e98905eSBodo Stroesser * We have to allocate data buffers before we can queue a command. 8287e98905eSBodo Stroesser * Returns -1 on error (not enough space) or number of needed iovs on success 8297e98905eSBodo Stroesser * 8307e98905eSBodo Stroesser * Called with ring lock held. 8317e98905eSBodo Stroesser */ 8327e98905eSBodo Stroesser static int tcmu_alloc_data_space(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 8337e98905eSBodo Stroesser int *iov_bidi_cnt) 8347e98905eSBodo Stroesser { 8357e98905eSBodo Stroesser int space, iov_cnt = 0, ret = 0; 8367e98905eSBodo Stroesser 8377e98905eSBodo Stroesser if (!cmd->dbi_cnt) 8387e98905eSBodo Stroesser goto wr_iov_cnts; 839bc2d214aSBodo Stroesser 840b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 841b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 84252ef2743SBodo Stroesser if (space < cmd->dbi_cnt) { 84380eb8761SMike Christie unsigned long blocks_left = 84480eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 845b6df4b79SXiubo Li 84652ef2743SBodo Stroesser if (blocks_left < cmd->dbi_cnt) { 8477e98905eSBodo Stroesser pr_debug("no data space: only %lu available, but ask for %lu\n", 848b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 84952ef2743SBodo Stroesser cmd->dbi_cnt * DATA_BLOCK_SIZE); 8507e98905eSBodo Stroesser return -1; 8517c9e7a6fSAndy Grover } 8527c9e7a6fSAndy Grover 85352ef2743SBodo Stroesser udev->dbi_thresh += cmd->dbi_cnt; 85480eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 85580eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 856b6df4b79SXiubo Li } 857b6df4b79SXiubo Li 8587e98905eSBodo Stroesser iov_cnt = tcmu_get_empty_blocks(udev, cmd, 8597e98905eSBodo Stroesser cmd->dbi_cnt - cmd->dbi_bidi_cnt); 8607e98905eSBodo Stroesser if (iov_cnt < 0) 8617e98905eSBodo Stroesser return -1; 8627e98905eSBodo Stroesser 8637e98905eSBodo Stroesser if (cmd->dbi_bidi_cnt) { 8647e98905eSBodo Stroesser ret = tcmu_get_empty_blocks(udev, cmd, cmd->dbi_bidi_cnt); 8657e98905eSBodo Stroesser if (ret < 0) 8667e98905eSBodo Stroesser return -1; 8677e98905eSBodo Stroesser } 8687e98905eSBodo Stroesser wr_iov_cnts: 8697e98905eSBodo Stroesser *iov_bidi_cnt = ret; 8707e98905eSBodo Stroesser return iov_cnt + ret; 8717c9e7a6fSAndy Grover } 8727c9e7a6fSAndy Grover 873fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 874fe25cc34SXiubo Li { 875fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 876fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 877fe25cc34SXiubo Li } 878fe25cc34SXiubo Li 879fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 880fe25cc34SXiubo Li size_t base_command_size) 881fe25cc34SXiubo Li { 882fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 883fe25cc34SXiubo Li size_t command_size; 884fe25cc34SXiubo Li 885fe25cc34SXiubo Li command_size = base_command_size + 886fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 887fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 888fe25cc34SXiubo Li 889fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 890fe25cc34SXiubo Li 891fe25cc34SXiubo Li return command_size; 892fe25cc34SXiubo Li } 893fe25cc34SXiubo Li 89461fb2482SBodo Stroesser static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8959103575aSMike Christie struct timer_list *timer) 8960d44374cSMike Christie { 8979103575aSMike Christie if (!tmo) 89861fb2482SBodo Stroesser return; 8999103575aSMike Christie 9000d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 901a94a2572SXiubo Li if (!timer_pending(timer)) 9029103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 903a94a2572SXiubo Li 90461fb2482SBodo Stroesser pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, 90561fb2482SBodo Stroesser tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); 9060d44374cSMike Christie } 9070d44374cSMike Christie 908a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 909af1dd7ffSMike Christie { 910af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9119103575aSMike Christie unsigned int tmo; 912af1dd7ffSMike Christie 9139103575aSMike Christie /* 9149103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9159103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9169103575aSMike Christie */ 9179103575aSMike Christie if (!udev->qfull_time_out) 9189103575aSMike Christie return -ETIMEDOUT; 9199103575aSMike Christie else if (udev->qfull_time_out > 0) 9209103575aSMike Christie tmo = udev->qfull_time_out; 9219103575aSMike Christie else if (udev->cmd_time_out) 9229103575aSMike Christie tmo = udev->cmd_time_out; 9239103575aSMike Christie else 9249103575aSMike Christie tmo = TCMU_TIME_OUT; 9259103575aSMike Christie 92661fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 927af1dd7ffSMike Christie 928a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 92961fb2482SBodo Stroesser pr_debug("adding cmd %p on dev %s to ring space wait queue\n", 93061fb2482SBodo Stroesser tcmu_cmd, udev->name); 931af1dd7ffSMike Christie return 0; 932af1dd7ffSMike Christie } 933af1dd7ffSMike Christie 9343d3f9d56SBodo Stroesser static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) 9353d3f9d56SBodo Stroesser { 9363d3f9d56SBodo Stroesser struct tcmu_cmd_entry_hdr *hdr; 9373d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 9383d3f9d56SBodo Stroesser uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9393d3f9d56SBodo Stroesser 9403d3f9d56SBodo Stroesser /* Insert a PAD if end-of-ring space is too small */ 9413d3f9d56SBodo Stroesser if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { 9423d3f9d56SBodo Stroesser size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 9433d3f9d56SBodo Stroesser 9443d3f9d56SBodo Stroesser hdr = (void *) mb + CMDR_OFF + cmd_head; 9453d3f9d56SBodo Stroesser tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); 9463d3f9d56SBodo Stroesser tcmu_hdr_set_len(&hdr->len_op, pad_size); 9473d3f9d56SBodo Stroesser hdr->cmd_id = 0; /* not used for PAD */ 9483d3f9d56SBodo Stroesser hdr->kflags = 0; 9493d3f9d56SBodo Stroesser hdr->uflags = 0; 9503d3f9d56SBodo Stroesser tcmu_flush_dcache_range(hdr, sizeof(*hdr)); 9513d3f9d56SBodo Stroesser 9523d3f9d56SBodo Stroesser UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 9533d3f9d56SBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 9543d3f9d56SBodo Stroesser 9553d3f9d56SBodo Stroesser cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9563d3f9d56SBodo Stroesser WARN_ON(cmd_head != 0); 9573d3f9d56SBodo Stroesser } 9583d3f9d56SBodo Stroesser 9593d3f9d56SBodo Stroesser return cmd_head; 9603d3f9d56SBodo Stroesser } 9613d3f9d56SBodo Stroesser 9626888da81SMike Christie static void tcmu_unplug_device(struct se_dev_plug *se_plug) 9636888da81SMike Christie { 9646888da81SMike Christie struct se_device *se_dev = se_plug->se_dev; 9656888da81SMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 9666888da81SMike Christie 9676888da81SMike Christie clear_bit(TCM_DEV_BIT_PLUGGED, &udev->flags); 9686888da81SMike Christie uio_event_notify(&udev->uio_info); 9696888da81SMike Christie } 9706888da81SMike Christie 9716888da81SMike Christie static struct se_dev_plug *tcmu_plug_device(struct se_device *se_dev) 9726888da81SMike Christie { 9736888da81SMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 9746888da81SMike Christie 9756888da81SMike Christie if (!test_and_set_bit(TCM_DEV_BIT_PLUGGED, &udev->flags)) 9766888da81SMike Christie return &udev->se_plug; 9776888da81SMike Christie 9786888da81SMike Christie return NULL; 9796888da81SMike Christie } 9806888da81SMike Christie 9816fd0ce79SMike Christie /** 9826fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9836fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9846fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9856fd0ce79SMike Christie * 9866fd0ce79SMike Christie * Returns: 9876fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9886fd0ce79SMike Christie * 0 success 989af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9906fd0ce79SMike Christie */ 991e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9927c9e7a6fSAndy Grover { 9937c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9947c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9957c9e7a6fSAndy Grover size_t base_command_size, command_size; 9963d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 9977c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 9987c9e7a6fSAndy Grover struct iovec *iov; 999d3cbb743SBodo Stroesser int iov_cnt, iov_bidi_cnt; 1000d3cbb743SBodo Stroesser uint32_t cmd_id, cmd_head; 10017c9e7a6fSAndy Grover uint64_t cdb_off; 100252ef2743SBodo Stroesser /* size of data buffer needed */ 100352ef2743SBodo Stroesser size_t data_length = (size_t)tcmu_cmd->dbi_cnt * DATA_BLOCK_SIZE; 10047c9e7a6fSAndy Grover 10056fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 10066fd0ce79SMike Christie 1007892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 1008892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 1009892782caSMike Christie return -1; 1010892782caSMike Christie } 1011892782caSMike Christie 10126fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 10136fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10146fd0ce79SMike Christie return -1; 10156fd0ce79SMike Christie } 10167c9e7a6fSAndy Grover 1017a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 1018af1dd7ffSMike Christie goto queue; 10197c9e7a6fSAndy Grover 10207e98905eSBodo Stroesser if (data_length > udev->data_size) { 10217e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %zu data area\n", 10227e98905eSBodo Stroesser data_length, udev->data_size); 10236fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 10246fd0ce79SMike Christie return -1; 1025554617b2SAndy Grover } 10267c9e7a6fSAndy Grover 10277e98905eSBodo Stroesser iov_cnt = tcmu_alloc_data_space(udev, tcmu_cmd, &iov_bidi_cnt); 10287e98905eSBodo Stroesser if (iov_cnt < 0) 10297e98905eSBodo Stroesser goto free_and_queue; 10307e98905eSBodo Stroesser 10317e98905eSBodo Stroesser /* 10327e98905eSBodo Stroesser * Must be a certain minimum size for response sense info, but 10337e98905eSBodo Stroesser * also may be larger if the iov array is large. 10347e98905eSBodo Stroesser */ 10357e98905eSBodo Stroesser base_command_size = tcmu_cmd_get_base_cmd_size(iov_cnt); 10367e98905eSBodo Stroesser command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 10377e98905eSBodo Stroesser 10387e98905eSBodo Stroesser if (command_size > (udev->cmdr_size / 2)) { 10397e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %u cmd ring\n", 10407e98905eSBodo Stroesser command_size, udev->cmdr_size); 10417e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 10427e98905eSBodo Stroesser *scsi_err = TCM_INVALID_CDB_FIELD; 10437e98905eSBodo Stroesser return -1; 10447e98905eSBodo Stroesser } 10457e98905eSBodo Stroesser 10467e98905eSBodo Stroesser if (!is_ring_space_avail(udev, command_size)) 1047810b8153SMike Christie /* 1048810b8153SMike Christie * Don't leave commands partially setup because the unmap 1049810b8153SMike Christie * thread might need the blocks to make forward progress. 1050810b8153SMike Christie */ 10517e98905eSBodo Stroesser goto free_and_queue; 105226418649SSheng Yang 1053d3cbb743SBodo Stroesser if (xa_alloc(&udev->commands, &cmd_id, tcmu_cmd, XA_LIMIT(1, 0xffff), 1054d3cbb743SBodo Stroesser GFP_NOWAIT) < 0) { 105561fb2482SBodo Stroesser pr_err("tcmu: Could not allocate cmd id.\n"); 10566fd0ce79SMike Christie 105761fb2482SBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10586fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10596fd0ce79SMike Christie return -1; 10600d44374cSMike Christie } 106161fb2482SBodo Stroesser tcmu_cmd->cmd_id = cmd_id; 106261fb2482SBodo Stroesser 106361fb2482SBodo Stroesser pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, 106461fb2482SBodo Stroesser tcmu_cmd, udev->name); 106561fb2482SBodo Stroesser 10667e98905eSBodo Stroesser cmd_head = ring_insert_padding(udev, command_size); 10677e98905eSBodo Stroesser 10687e98905eSBodo Stroesser entry = (void *) mb + CMDR_OFF + cmd_head; 10697e98905eSBodo Stroesser memset(entry, 0, command_size); 10707e98905eSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10717e98905eSBodo Stroesser 10727e98905eSBodo Stroesser /* prepare iov list and copy data to data area if necessary */ 10737e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10747e98905eSBodo Stroesser iov = &entry->req.iov[0]; 10753c9a7c58SBodo Stroesser 10763c9a7c58SBodo Stroesser if (se_cmd->data_direction == DMA_TO_DEVICE || 10773c9a7c58SBodo Stroesser se_cmd->se_cmd_flags & SCF_BIDI) 10783c9a7c58SBodo Stroesser scatter_data_area(udev, tcmu_cmd, &iov); 10793c9a7c58SBodo Stroesser else 10803c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, se_cmd->data_length); 10813c9a7c58SBodo Stroesser 10827e98905eSBodo Stroesser entry->req.iov_cnt = iov_cnt - iov_bidi_cnt; 10837e98905eSBodo Stroesser 10847e98905eSBodo Stroesser /* Handle BIDI commands */ 10857e98905eSBodo Stroesser if (se_cmd->se_cmd_flags & SCF_BIDI) { 10867e98905eSBodo Stroesser iov++; 10873c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, tcmu_cmd->data_len_bidi); 10887e98905eSBodo Stroesser entry->req.iov_bidi_cnt = iov_bidi_cnt; 10897e98905eSBodo Stroesser } 10907e98905eSBodo Stroesser 109161fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); 109261fb2482SBodo Stroesser 10930d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10940d44374cSMike Christie 1095fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1096fe25cc34SXiubo Li 10977c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 10987c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 10997c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 11007c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 11018c4e0f21SBodo Stroesser tcmu_flush_dcache_range(entry, command_size); 11027c9e7a6fSAndy Grover 11037c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 11047c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 11057c9e7a6fSAndy Grover 1106a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1107a94a2572SXiubo Li 11086888da81SMike Christie if (!test_bit(TCM_DEV_BIT_PLUGGED, &udev->flags)) 11097c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 11107c9e7a6fSAndy Grover 11116fd0ce79SMike Christie return 0; 1112af1dd7ffSMike Christie 11137e98905eSBodo Stroesser free_and_queue: 11147e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 11157e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 11167e98905eSBodo Stroesser 1117af1dd7ffSMike Christie queue: 1118a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1119af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1120af1dd7ffSMike Christie return -1; 1121af1dd7ffSMike Christie } 1122af1dd7ffSMike Christie 1123af1dd7ffSMike Christie return 1; 11247c9e7a6fSAndy Grover } 11257c9e7a6fSAndy Grover 1126bc2d214aSBodo Stroesser /** 1127bc2d214aSBodo Stroesser * queue_tmr_ring - queue tmr info to ring or internally 1128bc2d214aSBodo Stroesser * @udev: related tcmu_dev 1129bc2d214aSBodo Stroesser * @tmr: tcmu_tmr containing tmr info to queue 1130bc2d214aSBodo Stroesser * 1131bc2d214aSBodo Stroesser * Returns: 1132bc2d214aSBodo Stroesser * 0 success 1133bc2d214aSBodo Stroesser * 1 internally queued to wait for ring memory to free. 1134bc2d214aSBodo Stroesser */ 1135bc2d214aSBodo Stroesser static int 1136bc2d214aSBodo Stroesser queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) 1137bc2d214aSBodo Stroesser { 1138bc2d214aSBodo Stroesser struct tcmu_tmr_entry *entry; 1139bc2d214aSBodo Stroesser int cmd_size; 1140bc2d214aSBodo Stroesser int id_list_sz; 1141bc2d214aSBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 1142bc2d214aSBodo Stroesser uint32_t cmd_head; 1143bc2d214aSBodo Stroesser 1144bc2d214aSBodo Stroesser if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 1145bc2d214aSBodo Stroesser goto out_free; 1146bc2d214aSBodo Stroesser 1147bc2d214aSBodo Stroesser id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; 1148bc2d214aSBodo Stroesser cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); 1149bc2d214aSBodo Stroesser 1150bc2d214aSBodo Stroesser if (!list_empty(&udev->tmr_queue) || 11517e98905eSBodo Stroesser !is_ring_space_avail(udev, cmd_size)) { 1152bc2d214aSBodo Stroesser list_add_tail(&tmr->queue_entry, &udev->tmr_queue); 1153bc2d214aSBodo Stroesser pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", 1154bc2d214aSBodo Stroesser tmr, udev->name); 1155bc2d214aSBodo Stroesser return 1; 1156bc2d214aSBodo Stroesser } 1157bc2d214aSBodo Stroesser 1158bc2d214aSBodo Stroesser cmd_head = ring_insert_padding(udev, cmd_size); 1159bc2d214aSBodo Stroesser 1160bc2d214aSBodo Stroesser entry = (void *)mb + CMDR_OFF + cmd_head; 1161bc2d214aSBodo Stroesser memset(entry, 0, cmd_size); 1162bc2d214aSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); 1163bc2d214aSBodo Stroesser tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); 1164bc2d214aSBodo Stroesser entry->tmr_type = tmr->tmr_type; 1165bc2d214aSBodo Stroesser entry->cmd_cnt = tmr->tmr_cmd_cnt; 1166bc2d214aSBodo Stroesser memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); 1167bc2d214aSBodo Stroesser tcmu_flush_dcache_range(entry, cmd_size); 1168bc2d214aSBodo Stroesser 1169bc2d214aSBodo Stroesser UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); 1170bc2d214aSBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 1171bc2d214aSBodo Stroesser 1172bc2d214aSBodo Stroesser uio_event_notify(&udev->uio_info); 1173bc2d214aSBodo Stroesser 1174bc2d214aSBodo Stroesser out_free: 1175bc2d214aSBodo Stroesser kfree(tmr); 1176bc2d214aSBodo Stroesser 1177bc2d214aSBodo Stroesser return 0; 1178bc2d214aSBodo Stroesser } 1179bc2d214aSBodo Stroesser 118002eb924fSAndy Grover static sense_reason_t 118102eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11827c9e7a6fSAndy Grover { 1183af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1184af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11857c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1186c9684927SBodo Stroesser sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; 1187c9684927SBodo Stroesser int ret = -1; 11887c9e7a6fSAndy Grover 11897c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11907c9e7a6fSAndy Grover if (!tcmu_cmd) 119102eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11927c9e7a6fSAndy Grover 1193af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1194c9684927SBodo Stroesser if (!(se_cmd->transport_state & CMD_T_ABORTED)) 1195af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1196af1dd7ffSMike Christie if (ret < 0) 1197141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 1198780e1384SShin'ichiro Kawasaki else 1199780e1384SShin'ichiro Kawasaki se_cmd->priv = tcmu_cmd; 1200a3512902SBodo Stroesser mutex_unlock(&udev->cmdr_lock); 12016fd0ce79SMike Christie return scsi_ret; 12027c9e7a6fSAndy Grover } 12037c9e7a6fSAndy Grover 1204ed212ca8SBodo Stroesser static void tcmu_set_next_deadline(struct list_head *queue, 1205ed212ca8SBodo Stroesser struct timer_list *timer) 1206ed212ca8SBodo Stroesser { 1207ed212ca8SBodo Stroesser struct tcmu_cmd *cmd; 1208ed212ca8SBodo Stroesser 1209ed212ca8SBodo Stroesser if (!list_empty(queue)) { 1210ed212ca8SBodo Stroesser cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); 1211ed212ca8SBodo Stroesser mod_timer(timer, cmd->deadline); 1212ed212ca8SBodo Stroesser } else 1213ed212ca8SBodo Stroesser del_timer(timer); 1214ed212ca8SBodo Stroesser } 1215ed212ca8SBodo Stroesser 1216bc2d214aSBodo Stroesser static int 1217bc2d214aSBodo Stroesser tcmu_tmr_type(enum tcm_tmreq_table tmf) 1218bc2d214aSBodo Stroesser { 1219bc2d214aSBodo Stroesser switch (tmf) { 1220bc2d214aSBodo Stroesser case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; 1221bc2d214aSBodo Stroesser case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; 1222bc2d214aSBodo Stroesser case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; 1223bc2d214aSBodo Stroesser case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; 1224bc2d214aSBodo Stroesser case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; 1225bc2d214aSBodo Stroesser case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; 1226bc2d214aSBodo Stroesser case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; 1227bc2d214aSBodo Stroesser case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; 1228bc2d214aSBodo Stroesser default: return TCMU_TMR_UNKNOWN; 1229bc2d214aSBodo Stroesser } 1230bc2d214aSBodo Stroesser } 1231bc2d214aSBodo Stroesser 1232bc2d214aSBodo Stroesser static void 1233bc2d214aSBodo Stroesser tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, 1234bc2d214aSBodo Stroesser struct list_head *cmd_list) 1235bc2d214aSBodo Stroesser { 1236bc2d214aSBodo Stroesser int i = 0, cmd_cnt = 0; 1237bc2d214aSBodo Stroesser bool unqueued = false; 1238bc2d214aSBodo Stroesser uint16_t *cmd_ids = NULL; 1239bc2d214aSBodo Stroesser struct tcmu_cmd *cmd; 1240bc2d214aSBodo Stroesser struct se_cmd *se_cmd; 1241bc2d214aSBodo Stroesser struct tcmu_tmr *tmr; 1242bc2d214aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(se_dev); 1243bc2d214aSBodo Stroesser 1244bc2d214aSBodo Stroesser mutex_lock(&udev->cmdr_lock); 1245bc2d214aSBodo Stroesser 1246bc2d214aSBodo Stroesser /* First we check for aborted commands in qfull_queue */ 1247bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1248bc2d214aSBodo Stroesser i++; 1249bc2d214aSBodo Stroesser if (!se_cmd->priv) 1250bc2d214aSBodo Stroesser continue; 1251bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1252bc2d214aSBodo Stroesser /* Commands on qfull queue have no id yet */ 1253bc2d214aSBodo Stroesser if (cmd->cmd_id) { 1254bc2d214aSBodo Stroesser cmd_cnt++; 1255bc2d214aSBodo Stroesser continue; 1256bc2d214aSBodo Stroesser } 1257bc2d214aSBodo Stroesser pr_debug("Removing aborted command %p from queue on dev %s.\n", 1258bc2d214aSBodo Stroesser cmd, udev->name); 1259bc2d214aSBodo Stroesser 1260bc2d214aSBodo Stroesser list_del_init(&cmd->queue_entry); 1261bc2d214aSBodo Stroesser tcmu_free_cmd(cmd); 1262780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 1263bc2d214aSBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); 1264bc2d214aSBodo Stroesser unqueued = true; 1265bc2d214aSBodo Stroesser } 1266bc2d214aSBodo Stroesser if (unqueued) 1267bc2d214aSBodo Stroesser tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1268bc2d214aSBodo Stroesser 126959526d7aSBodo Stroesser if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) 127059526d7aSBodo Stroesser goto unlock; 127159526d7aSBodo Stroesser 1272bc2d214aSBodo Stroesser pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", 1273bc2d214aSBodo Stroesser tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); 1274bc2d214aSBodo Stroesser 1275bc2d214aSBodo Stroesser tmr = kmalloc(sizeof(*tmr) + cmd_cnt * sizeof(*cmd_ids), GFP_KERNEL); 1276bc2d214aSBodo Stroesser if (!tmr) 1277bc2d214aSBodo Stroesser goto unlock; 1278bc2d214aSBodo Stroesser 1279bc2d214aSBodo Stroesser tmr->tmr_type = tcmu_tmr_type(tmf); 1280bc2d214aSBodo Stroesser tmr->tmr_cmd_cnt = cmd_cnt; 1281bc2d214aSBodo Stroesser 1282bc2d214aSBodo Stroesser if (cmd_cnt != 0) { 1283bc2d214aSBodo Stroesser cmd_cnt = 0; 1284bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1285bc2d214aSBodo Stroesser if (!se_cmd->priv) 1286bc2d214aSBodo Stroesser continue; 1287bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1288bc2d214aSBodo Stroesser if (cmd->cmd_id) 1289bc2d214aSBodo Stroesser tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; 1290bc2d214aSBodo Stroesser } 1291bc2d214aSBodo Stroesser } 1292bc2d214aSBodo Stroesser 1293bc2d214aSBodo Stroesser queue_tmr_ring(udev, tmr); 1294bc2d214aSBodo Stroesser 1295bc2d214aSBodo Stroesser unlock: 1296bc2d214aSBodo Stroesser mutex_unlock(&udev->cmdr_lock); 1297bc2d214aSBodo Stroesser } 1298bc2d214aSBodo Stroesser 12997c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 13007c9e7a6fSAndy Grover { 13017c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 13027c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 13036c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 1304a86a7586SDmitry Fomichev uint32_t read_len; 13057c9e7a6fSAndy Grover 1306b25c7863SSheng Yang /* 1307b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 13083d9b9555SAndy Grover * data area space and free cmd 1309b25c7863SSheng Yang */ 1310a86a7586SDmitry Fomichev if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1311a86a7586SDmitry Fomichev WARN_ON_ONCE(se_cmd); 1312141685a3SXiubo Li goto out; 1313a86a7586SDmitry Fomichev } 1314b25c7863SSheng Yang 1315a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1316a94a2572SXiubo Li 1317141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 13187c9e7a6fSAndy Grover 13190ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 13200ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 13210ad46af8SAndy Grover cmd->se_cmd); 1322ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 13236c3796d1Sbstroesser@ts.fujitsu.com goto done; 13246c3796d1Sbstroesser@ts.fujitsu.com } 13256c3796d1Sbstroesser@ts.fujitsu.com 1326a86a7586SDmitry Fomichev read_len = se_cmd->data_length; 13276c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 13286c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 13296c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 13306c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 13316c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 13326c3796d1Sbstroesser@ts.fujitsu.com } 13336c3796d1Sbstroesser@ts.fujitsu.com 13346c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1335406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 13366c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 13376c3796d1Sbstroesser@ts.fujitsu.com goto done; 13386c3796d1Sbstroesser@ts.fujitsu.com else 13396c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 13406c3796d1Sbstroesser@ts.fujitsu.com } 13416c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 134226418649SSheng Yang /* Get Data-In buffer before clean up */ 13436c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1344e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 13456c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 13467c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1347141685a3SXiubo Li /* TODO: */ 13482bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 13492bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 13502bc396a2SIlias Tsitsimpis se_cmd->data_direction); 13517c9e7a6fSAndy Grover } 13527c9e7a6fSAndy Grover 13536c3796d1Sbstroesser@ts.fujitsu.com done: 1354780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 13556c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 13566c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 13576c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 13586c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 13596c3796d1Sbstroesser@ts.fujitsu.com } else 13607c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 13617c9e7a6fSAndy Grover 1362141685a3SXiubo Li out: 1363b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1364141685a3SXiubo Li tcmu_free_cmd(cmd); 13657c9e7a6fSAndy Grover } 13667c9e7a6fSAndy Grover 1367bc2d214aSBodo Stroesser static int tcmu_run_tmr_queue(struct tcmu_dev *udev) 1368bc2d214aSBodo Stroesser { 1369bc2d214aSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 1370bc2d214aSBodo Stroesser LIST_HEAD(tmrs); 1371bc2d214aSBodo Stroesser 1372bc2d214aSBodo Stroesser if (list_empty(&udev->tmr_queue)) 1373bc2d214aSBodo Stroesser return 1; 1374bc2d214aSBodo Stroesser 1375bc2d214aSBodo Stroesser pr_debug("running %s's tmr queue\n", udev->name); 1376bc2d214aSBodo Stroesser 1377bc2d214aSBodo Stroesser list_splice_init(&udev->tmr_queue, &tmrs); 1378bc2d214aSBodo Stroesser 1379bc2d214aSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { 1380bc2d214aSBodo Stroesser list_del_init(&tmr->queue_entry); 1381bc2d214aSBodo Stroesser 1382bc2d214aSBodo Stroesser pr_debug("removing tmr %p on dev %s from queue\n", 1383bc2d214aSBodo Stroesser tmr, udev->name); 1384bc2d214aSBodo Stroesser 1385bc2d214aSBodo Stroesser if (queue_tmr_ring(udev, tmr)) { 1386bc2d214aSBodo Stroesser pr_debug("ran out of space during tmr queue run\n"); 1387bc2d214aSBodo Stroesser /* 1388bc2d214aSBodo Stroesser * tmr was requeued, so just put all tmrs back in 1389bc2d214aSBodo Stroesser * the queue 1390bc2d214aSBodo Stroesser */ 1391bc2d214aSBodo Stroesser list_splice_tail(&tmrs, &udev->tmr_queue); 1392bc2d214aSBodo Stroesser return 0; 1393bc2d214aSBodo Stroesser } 1394bc2d214aSBodo Stroesser } 1395bc2d214aSBodo Stroesser 1396bc2d214aSBodo Stroesser return 1; 1397bc2d214aSBodo Stroesser } 1398bc2d214aSBodo Stroesser 13997c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 14007c9e7a6fSAndy Grover { 14017c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1402a94a2572SXiubo Li struct tcmu_cmd *cmd; 1403bc2d214aSBodo Stroesser bool free_space = false; 14047c9e7a6fSAndy Grover 14057c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 14067c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 14077c9e7a6fSAndy Grover return 0; 14087c9e7a6fSAndy Grover } 14097c9e7a6fSAndy Grover 14107c9e7a6fSAndy Grover mb = udev->mb_addr; 14117c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 14127c9e7a6fSAndy Grover 14136aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 14147c9e7a6fSAndy Grover 14157c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 14167c9e7a6fSAndy Grover 14175a0c256dSBodo Stroesser /* 14185a0c256dSBodo Stroesser * Flush max. up to end of cmd ring since current entry might 14195a0c256dSBodo Stroesser * be a padding that is shorter than sizeof(*entry) 14205a0c256dSBodo Stroesser */ 14215a0c256dSBodo Stroesser size_t ring_left = head_to_end(udev->cmdr_last_cleaned, 14225a0c256dSBodo Stroesser udev->cmdr_size); 14235a0c256dSBodo Stroesser tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? 14245a0c256dSBodo Stroesser ring_left : sizeof(*entry)); 14257c9e7a6fSAndy Grover 1426bc2d214aSBodo Stroesser free_space = true; 1427bc2d214aSBodo Stroesser 1428bc2d214aSBodo Stroesser if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || 1429bc2d214aSBodo Stroesser tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { 14300ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14310ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14320ad46af8SAndy Grover udev->cmdr_size); 14337c9e7a6fSAndy Grover continue; 14347c9e7a6fSAndy Grover } 14350ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 14367c9e7a6fSAndy Grover 1437d3cbb743SBodo Stroesser cmd = xa_erase(&udev->commands, entry->hdr.cmd_id); 14387c9e7a6fSAndy Grover if (!cmd) { 143988cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 144088cf1073SMike Christie entry->hdr.cmd_id); 14417c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 14427c9e7a6fSAndy Grover break; 14437c9e7a6fSAndy Grover } 14447c9e7a6fSAndy Grover 14457c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 14467c9e7a6fSAndy Grover 14470ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14480ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14490ad46af8SAndy Grover udev->cmdr_size); 14507c9e7a6fSAndy Grover } 1451bc2d214aSBodo Stroesser if (free_space) 1452bc2d214aSBodo Stroesser free_space = tcmu_run_tmr_queue(udev); 14537c9e7a6fSAndy Grover 1454ed212ca8SBodo Stroesser if (atomic_read(&global_db_count) > tcmu_global_max_blocks && 1455d3cbb743SBodo Stroesser xa_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { 1456af1dd7ffSMike Christie /* 1457ed212ca8SBodo Stroesser * Allocated blocks exceeded global block limit, currently no 1458ed212ca8SBodo Stroesser * more pending or waiting commands so try to reclaim blocks. 1459af1dd7ffSMike Christie */ 1460af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1461af1dd7ffSMike Christie } 1462ed212ca8SBodo Stroesser if (udev->cmd_time_out) 1463a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 14647c9e7a6fSAndy Grover 1465bc2d214aSBodo Stroesser return free_space; 14667c9e7a6fSAndy Grover } 14677c9e7a6fSAndy Grover 146861fb2482SBodo Stroesser static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) 14697c9e7a6fSAndy Grover { 1470af1dd7ffSMike Christie struct se_cmd *se_cmd; 14717c9e7a6fSAndy Grover 1472ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 147361fb2482SBodo Stroesser return; 14749103575aSMike Christie 1475af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 147640d883b0SXiubo Li list_del_init(&cmd->queue_entry); 147761fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 1478a3512902SBodo Stroesser se_cmd->priv = NULL; 1479a86a7586SDmitry Fomichev cmd->se_cmd = NULL; 148061fb2482SBodo Stroesser 148161fb2482SBodo Stroesser pr_debug("Timing out inflight cmd %u on dev %s.\n", 148261fb2482SBodo Stroesser cmd->cmd_id, cmd->tcmu_dev->name); 148361fb2482SBodo Stroesser 148461fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); 1485af1dd7ffSMike Christie } 14869103575aSMike Christie 148761fb2482SBodo Stroesser static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) 148861fb2482SBodo Stroesser { 148961fb2482SBodo Stroesser struct se_cmd *se_cmd; 14909103575aSMike Christie 1491ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 149261fb2482SBodo Stroesser return; 149361fb2482SBodo Stroesser 14949d7464b1SDan Carpenter pr_debug("Timing out queued cmd %p on dev %s.\n", 14959d7464b1SDan Carpenter cmd, cmd->tcmu_dev->name); 14969d7464b1SDan Carpenter 149761fb2482SBodo Stroesser list_del_init(&cmd->queue_entry); 149861fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 149961fb2482SBodo Stroesser tcmu_free_cmd(cmd); 150061fb2482SBodo Stroesser 1501780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 150261fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); 15037c9e7a6fSAndy Grover } 15047c9e7a6fSAndy Grover 15059103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 15067c9e7a6fSAndy Grover { 1507488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1508488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1509488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1510488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 15117c9e7a6fSAndy Grover 1512af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 15137c9e7a6fSAndy Grover } 15147c9e7a6fSAndy Grover 15159103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 15169103575aSMike Christie { 15179103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 15189103575aSMike Christie 15199103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 15209103575aSMike Christie tcmu_device_timedout(udev); 15219103575aSMike Christie } 15229103575aSMike Christie 15239103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 15249103575aSMike Christie { 15259103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 15269103575aSMike Christie 15279103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 15289103575aSMike Christie tcmu_device_timedout(udev); 15299103575aSMike Christie } 15309103575aSMike Christie 15317c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 15327c9e7a6fSAndy Grover { 15337c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 15347c9e7a6fSAndy Grover 15357c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 15367c9e7a6fSAndy Grover if (!tcmu_hba) 15377c9e7a6fSAndy Grover return -ENOMEM; 15387c9e7a6fSAndy Grover 15397c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 15407c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 15417c9e7a6fSAndy Grover 15427c9e7a6fSAndy Grover return 0; 15437c9e7a6fSAndy Grover } 15447c9e7a6fSAndy Grover 15457c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 15467c9e7a6fSAndy Grover { 15477c9e7a6fSAndy Grover kfree(hba->hba_ptr); 15487c9e7a6fSAndy Grover hba->hba_ptr = NULL; 15497c9e7a6fSAndy Grover } 15507c9e7a6fSAndy Grover 15517c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 15527c9e7a6fSAndy Grover { 15537c9e7a6fSAndy Grover struct tcmu_dev *udev; 15547c9e7a6fSAndy Grover 15557c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 15567c9e7a6fSAndy Grover if (!udev) 15577c9e7a6fSAndy Grover return NULL; 1558f3cdbe39SMike Christie kref_init(&udev->kref); 15597c9e7a6fSAndy Grover 15607c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 15617c9e7a6fSAndy Grover if (!udev->name) { 15627c9e7a6fSAndy Grover kfree(udev); 15637c9e7a6fSAndy Grover return NULL; 15647c9e7a6fSAndy Grover } 15657c9e7a6fSAndy Grover 15667c9e7a6fSAndy Grover udev->hba = hba; 1567af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 15689103575aSMike Christie udev->qfull_time_out = -1; 15697c9e7a6fSAndy Grover 157080eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1571b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 15727c9e7a6fSAndy Grover 1573ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1574488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1575a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1576bc2d214aSBodo Stroesser INIT_LIST_HEAD(&udev->tmr_queue); 1577a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 1578d3cbb743SBodo Stroesser xa_init_flags(&udev->commands, XA_FLAGS_ALLOC1); 15797c9e7a6fSAndy Grover 15809103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 15819103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 15827c9e7a6fSAndy Grover 1583*f7c89771SBodo Stroesser xa_init(&udev->data_blocks); 1584c22adc0bSXiubo Li 15857c9e7a6fSAndy Grover return &udev->se_dev; 15867c9e7a6fSAndy Grover } 15877c9e7a6fSAndy Grover 158843bf922cSBodo Stroesser static void tcmu_dev_call_rcu(struct rcu_head *p) 158943bf922cSBodo Stroesser { 159043bf922cSBodo Stroesser struct se_device *dev = container_of(p, struct se_device, rcu_head); 159143bf922cSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(dev); 159243bf922cSBodo Stroesser 159343bf922cSBodo Stroesser kfree(udev->uio_info.name); 159443bf922cSBodo Stroesser kfree(udev->name); 159543bf922cSBodo Stroesser kfree(udev); 159643bf922cSBodo Stroesser } 159743bf922cSBodo Stroesser 159843bf922cSBodo Stroesser static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 159943bf922cSBodo Stroesser { 160043bf922cSBodo Stroesser if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 160143bf922cSBodo Stroesser kmem_cache_free(tcmu_cmd_cache, cmd); 160243bf922cSBodo Stroesser return 0; 160343bf922cSBodo Stroesser } 160443bf922cSBodo Stroesser return -EINVAL; 160543bf922cSBodo Stroesser } 160643bf922cSBodo Stroesser 1607*f7c89771SBodo Stroesser static void tcmu_blocks_release(struct xarray *blocks, unsigned long first, 1608*f7c89771SBodo Stroesser unsigned long last) 160943bf922cSBodo Stroesser { 1610*f7c89771SBodo Stroesser XA_STATE(xas, blocks, first); 161143bf922cSBodo Stroesser struct page *page; 161243bf922cSBodo Stroesser 1613*f7c89771SBodo Stroesser xas_lock(&xas); 1614*f7c89771SBodo Stroesser xas_for_each(&xas, page, last) { 1615*f7c89771SBodo Stroesser xas_store(&xas, NULL); 161643bf922cSBodo Stroesser __free_page(page); 161743bf922cSBodo Stroesser atomic_dec(&global_db_count); 161843bf922cSBodo Stroesser } 1619*f7c89771SBodo Stroesser xas_unlock(&xas); 162043bf922cSBodo Stroesser } 162143bf922cSBodo Stroesser 162243bf922cSBodo Stroesser static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) 162343bf922cSBodo Stroesser { 162443bf922cSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 162543bf922cSBodo Stroesser 162643bf922cSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { 162743bf922cSBodo Stroesser list_del_init(&tmr->queue_entry); 162843bf922cSBodo Stroesser kfree(tmr); 162943bf922cSBodo Stroesser } 163043bf922cSBodo Stroesser } 163143bf922cSBodo Stroesser 163243bf922cSBodo Stroesser static void tcmu_dev_kref_release(struct kref *kref) 163343bf922cSBodo Stroesser { 163443bf922cSBodo Stroesser struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 163543bf922cSBodo Stroesser struct se_device *dev = &udev->se_dev; 163643bf922cSBodo Stroesser struct tcmu_cmd *cmd; 163743bf922cSBodo Stroesser bool all_expired = true; 1638d3cbb743SBodo Stroesser unsigned long i; 163943bf922cSBodo Stroesser 164043bf922cSBodo Stroesser vfree(udev->mb_addr); 164143bf922cSBodo Stroesser udev->mb_addr = NULL; 164243bf922cSBodo Stroesser 164343bf922cSBodo Stroesser spin_lock_bh(&timed_out_udevs_lock); 164443bf922cSBodo Stroesser if (!list_empty(&udev->timedout_entry)) 164543bf922cSBodo Stroesser list_del(&udev->timedout_entry); 164643bf922cSBodo Stroesser spin_unlock_bh(&timed_out_udevs_lock); 164743bf922cSBodo Stroesser 164843bf922cSBodo Stroesser /* Upper layer should drain all requests before calling this */ 164943bf922cSBodo Stroesser mutex_lock(&udev->cmdr_lock); 1650d3cbb743SBodo Stroesser xa_for_each(&udev->commands, i, cmd) { 165143bf922cSBodo Stroesser if (tcmu_check_and_free_pending_cmd(cmd) != 0) 165243bf922cSBodo Stroesser all_expired = false; 165343bf922cSBodo Stroesser } 165443bf922cSBodo Stroesser /* There can be left over TMR cmds. Remove them. */ 165543bf922cSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 165643bf922cSBodo Stroesser if (!list_empty(&udev->qfull_queue)) 165743bf922cSBodo Stroesser all_expired = false; 1658d3cbb743SBodo Stroesser xa_destroy(&udev->commands); 165943bf922cSBodo Stroesser WARN_ON(!all_expired); 166043bf922cSBodo Stroesser 166143bf922cSBodo Stroesser tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 166243bf922cSBodo Stroesser bitmap_free(udev->data_bitmap); 166343bf922cSBodo Stroesser mutex_unlock(&udev->cmdr_lock); 166443bf922cSBodo Stroesser 16658f33bb24SBodo Stroesser pr_debug("dev_kref_release\n"); 16668f33bb24SBodo Stroesser 166743bf922cSBodo Stroesser call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 166843bf922cSBodo Stroesser } 166943bf922cSBodo Stroesser 167061fb2482SBodo Stroesser static void run_qfull_queue(struct tcmu_dev *udev, bool fail) 1671af1dd7ffSMike Christie { 1672af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1673af1dd7ffSMike Christie LIST_HEAD(cmds); 1674af1dd7ffSMike Christie sense_reason_t scsi_ret; 1675af1dd7ffSMike Christie int ret; 1676af1dd7ffSMike Christie 1677a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 167861fb2482SBodo Stroesser return; 1679af1dd7ffSMike Christie 1680892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1681af1dd7ffSMike Christie 1682a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1683af1dd7ffSMike Christie 1684a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1685a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1686af1dd7ffSMike Christie 168761fb2482SBodo Stroesser pr_debug("removing cmd %p on dev %s from queue\n", 168861fb2482SBodo Stroesser tcmu_cmd, udev->name); 1689af1dd7ffSMike Christie 1690892782caSMike Christie if (fail) { 1691892782caSMike Christie /* 1692892782caSMike Christie * We were not able to even start the command, so 1693892782caSMike Christie * fail with busy to allow a retry in case runner 1694892782caSMike Christie * was only temporarily down. If the device is being 1695892782caSMike Christie * removed then LIO core will do the right thing and 1696892782caSMike Christie * fail the retry. 1697892782caSMike Christie */ 1698780e1384SShin'ichiro Kawasaki tcmu_cmd->se_cmd->priv = NULL; 1699892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1700892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1701892782caSMike Christie continue; 1702892782caSMike Christie } 1703892782caSMike Christie 1704af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1705af1dd7ffSMike Christie if (ret < 0) { 170661fb2482SBodo Stroesser pr_debug("cmd %p on dev %s failed with %u\n", 170761fb2482SBodo Stroesser tcmu_cmd, udev->name, scsi_ret); 1708af1dd7ffSMike Christie /* 1709af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1710af1dd7ffSMike Christie * drops it. 1711af1dd7ffSMike Christie */ 1712780e1384SShin'ichiro Kawasaki tcmu_cmd->se_cmd->priv = NULL; 1713af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1714af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1715af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1716af1dd7ffSMike Christie } else if (ret > 0) { 1717af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1718af1dd7ffSMike Christie /* 1719af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1720af1dd7ffSMike Christie * the queue 1721af1dd7ffSMike Christie */ 1722a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1723a94a2572SXiubo Li break; 1724af1dd7ffSMike Christie } 1725af1dd7ffSMike Christie } 1726a94a2572SXiubo Li 1727a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1728af1dd7ffSMike Christie } 1729af1dd7ffSMike Christie 17307c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 17317c9e7a6fSAndy Grover { 1732af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 17337c9e7a6fSAndy Grover 1734af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1735bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 1736a94a2572SXiubo Li run_qfull_queue(udev, false); 1737af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 17387c9e7a6fSAndy Grover 17397c9e7a6fSAndy Grover return 0; 17407c9e7a6fSAndy Grover } 17417c9e7a6fSAndy Grover 17427c9e7a6fSAndy Grover /* 17437c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 17447c9e7a6fSAndy Grover * and this stuff must come along. 17457c9e7a6fSAndy Grover */ 17467c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 17477c9e7a6fSAndy Grover { 17487c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 17497c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 17507c9e7a6fSAndy Grover 17517c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 17527c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 17537c9e7a6fSAndy Grover return -1; 17547c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 17557c9e7a6fSAndy Grover } 17567c9e7a6fSAndy Grover return -1; 17577c9e7a6fSAndy Grover } 17587c9e7a6fSAndy Grover 1759b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1760b6df4b79SXiubo Li { 1761b6df4b79SXiubo Li struct page *page; 1762b6df4b79SXiubo Li 1763b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1764b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1765b6df4b79SXiubo Li if (likely(page)) { 1766b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1767b6df4b79SXiubo Li return page; 1768b6df4b79SXiubo Li } 1769b6df4b79SXiubo Li 1770b6df4b79SXiubo Li /* 1771c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1772c1c390baSMike Christie * data iov passed to it. 1773b6df4b79SXiubo Li */ 1774c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1775c1c390baSMike Christie dbi, udev->name); 1776c1c390baSMike Christie page = NULL; 1777b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1778b6df4b79SXiubo Li 1779b6df4b79SXiubo Li return page; 1780b6df4b79SXiubo Li } 1781b6df4b79SXiubo Li 17828f33bb24SBodo Stroesser static void tcmu_vma_open(struct vm_area_struct *vma) 17838f33bb24SBodo Stroesser { 17848f33bb24SBodo Stroesser struct tcmu_dev *udev = vma->vm_private_data; 17858f33bb24SBodo Stroesser 17868f33bb24SBodo Stroesser pr_debug("vma_open\n"); 17878f33bb24SBodo Stroesser 17888f33bb24SBodo Stroesser kref_get(&udev->kref); 17898f33bb24SBodo Stroesser } 17908f33bb24SBodo Stroesser 17918f33bb24SBodo Stroesser static void tcmu_vma_close(struct vm_area_struct *vma) 17928f33bb24SBodo Stroesser { 17938f33bb24SBodo Stroesser struct tcmu_dev *udev = vma->vm_private_data; 17948f33bb24SBodo Stroesser 17958f33bb24SBodo Stroesser pr_debug("vma_close\n"); 17968f33bb24SBodo Stroesser 17978f33bb24SBodo Stroesser /* release ref from tcmu_vma_open */ 17988f33bb24SBodo Stroesser kref_put(&udev->kref, tcmu_dev_kref_release); 17998f33bb24SBodo Stroesser } 18008f33bb24SBodo Stroesser 180169589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 18027c9e7a6fSAndy Grover { 180311bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 18047c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 18057c9e7a6fSAndy Grover struct page *page; 18067c9e7a6fSAndy Grover unsigned long offset; 18077c9e7a6fSAndy Grover void *addr; 18087c9e7a6fSAndy Grover 180911bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 18107c9e7a6fSAndy Grover if (mi < 0) 18117c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 18127c9e7a6fSAndy Grover 18137c9e7a6fSAndy Grover /* 18147c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 18157c9e7a6fSAndy Grover * to use mem[N]. 18167c9e7a6fSAndy Grover */ 18177c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 18187c9e7a6fSAndy Grover 1819141685a3SXiubo Li if (offset < udev->data_off) { 1820141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 18217c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 18227c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1823141685a3SXiubo Li } else { 1824141685a3SXiubo Li uint32_t dbi; 1825141685a3SXiubo Li 1826b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1827141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1828b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1829b6df4b79SXiubo Li if (!page) 1830c1c390baSMike Christie return VM_FAULT_SIGBUS; 1831141685a3SXiubo Li } 1832141685a3SXiubo Li 18337c9e7a6fSAndy Grover get_page(page); 18347c9e7a6fSAndy Grover vmf->page = page; 18357c9e7a6fSAndy Grover return 0; 18367c9e7a6fSAndy Grover } 18377c9e7a6fSAndy Grover 18387c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 18398f33bb24SBodo Stroesser .open = tcmu_vma_open, 18408f33bb24SBodo Stroesser .close = tcmu_vma_close, 18417c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 18427c9e7a6fSAndy Grover }; 18437c9e7a6fSAndy Grover 18447c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 18457c9e7a6fSAndy Grover { 18467c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18477c9e7a6fSAndy Grover 18487c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 18497c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 18507c9e7a6fSAndy Grover 18517c9e7a6fSAndy Grover vma->vm_private_data = udev; 18527c9e7a6fSAndy Grover 18537c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 185480eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 18557c9e7a6fSAndy Grover return -EINVAL; 18567c9e7a6fSAndy Grover 18578f33bb24SBodo Stroesser tcmu_vma_open(vma); 18588f33bb24SBodo Stroesser 18597c9e7a6fSAndy Grover return 0; 18607c9e7a6fSAndy Grover } 18617c9e7a6fSAndy Grover 18627c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 18637c9e7a6fSAndy Grover { 18647c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18657c9e7a6fSAndy Grover 18667c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 18677c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 18687c9e7a6fSAndy Grover return -EBUSY; 18697c9e7a6fSAndy Grover 1870b6df4b79SXiubo Li udev->inode = inode; 1871b6df4b79SXiubo Li 18727c9e7a6fSAndy Grover pr_debug("open\n"); 18737c9e7a6fSAndy Grover 18747c9e7a6fSAndy Grover return 0; 18757c9e7a6fSAndy Grover } 18767c9e7a6fSAndy Grover 18777c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 18787c9e7a6fSAndy Grover { 18797c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18807c9e7a6fSAndy Grover 18817c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 18827c9e7a6fSAndy Grover 18837c9e7a6fSAndy Grover pr_debug("close\n"); 18848f33bb24SBodo Stroesser 18857c9e7a6fSAndy Grover return 0; 18867c9e7a6fSAndy Grover } 18877c9e7a6fSAndy Grover 18889de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1889b3af66e2SMike Christie { 1890b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1891b3af66e2SMike Christie 1892b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 18939de3a1efSMike Christie return 0; 1894b849b456SKenjiro Nakayama 1895b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 18969de3a1efSMike Christie return 0; 1897b849b456SKenjiro Nakayama 18983228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1899b3af66e2SMike Christie 1900bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1901bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1902bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1903bdaeedc1SMike Christie udev->name); 1904bdaeedc1SMike Christie return -EAGAIN; 1905bdaeedc1SMike Christie } 1906b3af66e2SMike Christie 1907b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 19083228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 19099de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 19109de3a1efSMike Christie nl_cmd->cmd, udev->name); 19119de3a1efSMike Christie return -EBUSY; 1912b3af66e2SMike Christie } 1913b3af66e2SMike Christie 1914b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1915b3af66e2SMike Christie nl_cmd->cmd = cmd; 19163228691fSMike Christie nl_cmd->udev = udev; 1917b3af66e2SMike Christie init_completion(&nl_cmd->complete); 19183228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1919b3af66e2SMike Christie 19203228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 19213228691fSMike Christie 19223228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 19239de3a1efSMike Christie return 0; 1924b3af66e2SMike Christie } 1925b3af66e2SMike Christie 19267d894862SLi Zhong static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) 19277d894862SLi Zhong { 19287d894862SLi Zhong struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 19297d894862SLi Zhong 19307d894862SLi Zhong if (!tcmu_kern_cmd_reply_supported) 19317d894862SLi Zhong return; 19327d894862SLi Zhong 19337d894862SLi Zhong if (udev->nl_reply_supported <= 0) 19347d894862SLi Zhong return; 19357d894862SLi Zhong 19367d894862SLi Zhong mutex_lock(&tcmu_nl_cmd_mutex); 19377d894862SLi Zhong 19387d894862SLi Zhong list_del(&nl_cmd->nl_list); 19397d894862SLi Zhong memset(nl_cmd, 0, sizeof(*nl_cmd)); 19407d894862SLi Zhong 19417d894862SLi Zhong mutex_unlock(&tcmu_nl_cmd_mutex); 19427d894862SLi Zhong } 19437d894862SLi Zhong 1944b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1945b3af66e2SMike Christie { 1946b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1947b3af66e2SMike Christie int ret; 1948b3af66e2SMike Christie 1949b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1950b3af66e2SMike Christie return 0; 1951b3af66e2SMike Christie 1952b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1953b849b456SKenjiro Nakayama return 0; 1954b849b456SKenjiro Nakayama 1955b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1956b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1957b3af66e2SMike Christie 19583228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1959b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1960b3af66e2SMike Christie ret = nl_cmd->status; 19613228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1962b3af66e2SMike Christie 196385fae482SLuis de Bethencourt return ret; 1964b3af66e2SMike Christie } 1965b3af66e2SMike Christie 19660e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 19670e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 19680e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 19697c9e7a6fSAndy Grover { 19707c9e7a6fSAndy Grover struct sk_buff *skb; 19717c9e7a6fSAndy Grover void *msg_header; 19726e14eab9SNicholas Bellinger int ret = -ENOMEM; 19737c9e7a6fSAndy Grover 19747c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 19757c9e7a6fSAndy Grover if (!skb) 19766e14eab9SNicholas Bellinger return ret; 19777c9e7a6fSAndy Grover 19787c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 19796e14eab9SNicholas Bellinger if (!msg_header) 19806e14eab9SNicholas Bellinger goto free_skb; 19817c9e7a6fSAndy Grover 1982b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 19836e14eab9SNicholas Bellinger if (ret < 0) 19846e14eab9SNicholas Bellinger goto free_skb; 19857c9e7a6fSAndy Grover 1986b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1987b3af66e2SMike Christie if (ret < 0) 1988b3af66e2SMike Christie goto free_skb; 1989b3af66e2SMike Christie 1990b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 19916e14eab9SNicholas Bellinger if (ret < 0) 19926e14eab9SNicholas Bellinger goto free_skb; 19937c9e7a6fSAndy Grover 19940e5aee39SZhu Lingshan *buf = skb; 19950e5aee39SZhu Lingshan *hdr = msg_header; 19960e5aee39SZhu Lingshan return ret; 19970e5aee39SZhu Lingshan 19980e5aee39SZhu Lingshan free_skb: 19990e5aee39SZhu Lingshan nlmsg_free(skb); 20000e5aee39SZhu Lingshan return ret; 20012d76443eSMike Christie } 20022d76443eSMike Christie 20030e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 20040e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 200506add777SMike Christie struct sk_buff *skb, void *msg_header) 20060e5aee39SZhu Lingshan { 200706add777SMike Christie int ret; 20088a45885cSBryant G. Ly 2009053c095aSJohannes Berg genlmsg_end(skb, msg_header); 20107c9e7a6fSAndy Grover 20119de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 20129de3a1efSMike Christie if (ret) { 20139de3a1efSMike Christie nlmsg_free(skb); 20149de3a1efSMike Christie return ret; 20159de3a1efSMike Christie } 2016b3af66e2SMike Christie 201720c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 20187c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 20192ff717cdSCathy Avery 20202ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 20212ff717cdSCathy Avery if (ret == 0 || 20222ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 20232ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 20247d894862SLi Zhong else 20257d894862SLi Zhong tcmu_destroy_genl_cmd_reply(udev); 20262ff717cdSCathy Avery 20270e5aee39SZhu Lingshan return ret; 20280e5aee39SZhu Lingshan } 20297c9e7a6fSAndy Grover 2030e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 2031e0c240acSZhu Lingshan { 2032e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 2033e0c240acSZhu Lingshan void *msg_header = NULL; 2034e0c240acSZhu Lingshan int ret = 0; 2035e0c240acSZhu Lingshan 2036e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 2037e0c240acSZhu Lingshan &msg_header); 2038e0c240acSZhu Lingshan if (ret < 0) 20397c9e7a6fSAndy Grover return ret; 204006add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 204106add777SMike Christie msg_header); 2042e0c240acSZhu Lingshan } 2043e0c240acSZhu Lingshan 2044f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 2045f892bd8eSZhu Lingshan { 2046f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 2047f892bd8eSZhu Lingshan void *msg_header = NULL; 2048f892bd8eSZhu Lingshan int ret = 0; 2049f892bd8eSZhu Lingshan 2050f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 2051f892bd8eSZhu Lingshan &skb, &msg_header); 2052f892bd8eSZhu Lingshan if (ret < 0) 20536e14eab9SNicholas Bellinger return ret; 2054f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 205506add777SMike Christie skb, msg_header); 20567c9e7a6fSAndy Grover } 20577c9e7a6fSAndy Grover 2058de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 20597c9e7a6fSAndy Grover { 20607c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 20617c9e7a6fSAndy Grover struct uio_info *info; 20627c9e7a6fSAndy Grover char *str; 20637c9e7a6fSAndy Grover 20647c9e7a6fSAndy Grover info = &udev->uio_info; 206522c2f35fSChristophe JAILLET 206622c2f35fSChristophe JAILLET if (udev->dev_config[0]) 206722c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, 206822c2f35fSChristophe JAILLET udev->name, udev->dev_config); 206922c2f35fSChristophe JAILLET else 207022c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, 207122c2f35fSChristophe JAILLET udev->name); 20727c9e7a6fSAndy Grover if (!str) 20737c9e7a6fSAndy Grover return -ENOMEM; 20747c9e7a6fSAndy Grover 2075ededd039SBryant G. Ly /* If the old string exists, free it */ 2076ededd039SBryant G. Ly kfree(info->name); 20777c9e7a6fSAndy Grover info->name = str; 20787c9e7a6fSAndy Grover 2079de8c5221SBryant G. Ly return 0; 2080de8c5221SBryant G. Ly } 2081de8c5221SBryant G. Ly 2082de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 2083de8c5221SBryant G. Ly { 2084de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 2085de8c5221SBryant G. Ly struct uio_info *info; 2086de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 2087de8c5221SBryant G. Ly int ret = 0; 2088de8c5221SBryant G. Ly 2089de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2090de8c5221SBryant G. Ly if (ret) 2091de8c5221SBryant G. Ly return ret; 2092de8c5221SBryant G. Ly 2093de8c5221SBryant G. Ly info = &udev->uio_info; 2094de8c5221SBryant G. Ly 2095c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 209698effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 2097c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2098a24e7917SWei Yongjun if (!udev->data_bitmap) { 2099a24e7917SWei Yongjun ret = -ENOMEM; 210080eb8761SMike Christie goto err_bitmap_alloc; 2101a24e7917SWei Yongjun } 210280eb8761SMike Christie 2103141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 21047c9e7a6fSAndy Grover if (!udev->mb_addr) { 21057c9e7a6fSAndy Grover ret = -ENOMEM; 21067c9e7a6fSAndy Grover goto err_vzalloc; 21077c9e7a6fSAndy Grover } 21087c9e7a6fSAndy Grover 21097c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 21107c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 21117c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 211280eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 2113b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 21147c9e7a6fSAndy Grover 2115141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 21167c9e7a6fSAndy Grover mb = udev->mb_addr; 21170ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 2118bc2d214aSBodo Stroesser mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | 2119bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_READ_LEN | 2120bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_TMR; 21217c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 21227c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 21237c9e7a6fSAndy Grover 21247c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 21257c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 212626418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 21277c9e7a6fSAndy Grover 2128ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 21297c9e7a6fSAndy Grover 21307c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 21310633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 213280eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 2133141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 21347c9e7a6fSAndy Grover 21357c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 21367c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 21377c9e7a6fSAndy Grover 21387c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 21397c9e7a6fSAndy Grover info->open = tcmu_open; 21407c9e7a6fSAndy Grover info->release = tcmu_release; 21417c9e7a6fSAndy Grover 21427c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 21437c9e7a6fSAndy Grover if (ret) 21447c9e7a6fSAndy Grover goto err_register; 21457c9e7a6fSAndy Grover 214681ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 214781ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 21487c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 214981ee28deSSheng Yang /* Other attributes can be configured in userspace */ 21503abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 21517c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 21529a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 21539a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 21547c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 21557c9e7a6fSAndy Grover 2156b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 2157b849b456SKenjiro Nakayama * module scope setting. 2158b849b456SKenjiro Nakayama */ 2159b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 2160b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 2161b849b456SKenjiro Nakayama 2162f3cdbe39SMike Christie /* 2163f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 2164f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 2165f3cdbe39SMike Christie */ 2166f3cdbe39SMike Christie kref_get(&udev->kref); 2167f3cdbe39SMike Christie 2168e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 21697c9e7a6fSAndy Grover if (ret) 21707c9e7a6fSAndy Grover goto err_netlink; 21717c9e7a6fSAndy Grover 2172b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2173b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 2174b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2175b6df4b79SXiubo Li 21767c9e7a6fSAndy Grover return 0; 21777c9e7a6fSAndy Grover 21787c9e7a6fSAndy Grover err_netlink: 2179f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 21807c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 21817c9e7a6fSAndy Grover err_register: 21827c9e7a6fSAndy Grover vfree(udev->mb_addr); 2183c22adc0bSXiubo Li udev->mb_addr = NULL; 21847c9e7a6fSAndy Grover err_vzalloc: 218598effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 218680eb8761SMike Christie udev->data_bitmap = NULL; 218780eb8761SMike Christie err_bitmap_alloc: 21887c9e7a6fSAndy Grover kfree(info->name); 2189f3cdbe39SMike Christie info->name = NULL; 21907c9e7a6fSAndy Grover 21917c9e7a6fSAndy Grover return ret; 21927c9e7a6fSAndy Grover } 21937c9e7a6fSAndy Grover 21947c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 21957c9e7a6fSAndy Grover { 21967c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 219792634706SMike Christie 219892634706SMike Christie /* release ref from init */ 219992634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 220092634706SMike Christie } 220192634706SMike Christie 220292634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 220392634706SMike Christie { 220492634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 22057c9e7a6fSAndy Grover 22069103575aSMike Christie del_timer_sync(&udev->cmd_timer); 22079103575aSMike Christie del_timer_sync(&udev->qfull_timer); 22087c9e7a6fSAndy Grover 2209b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2210b6df4b79SXiubo Li list_del(&udev->node); 2211b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2212b6df4b79SXiubo Li 2213f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 22147c9e7a6fSAndy Grover 22157c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 22169260695dSMike Christie 22179260695dSMike Christie /* release ref from configure */ 22189260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 22197c9e7a6fSAndy Grover } 22207c9e7a6fSAndy Grover 2221892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 2222892782caSMike Christie { 2223892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2224892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 2225892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2226892782caSMike Christie } 2227892782caSMike Christie 2228892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 2229892782caSMike Christie { 2230892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2231892782caSMike Christie 2232892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2233892782caSMike Christie goto unlock; 2234892782caSMike Christie 2235892782caSMike Christie /* complete IO that has executed successfully */ 2236892782caSMike Christie tcmu_handle_completions(udev); 2237892782caSMike Christie /* fail IO waiting to be queued */ 2238a94a2572SXiubo Li run_qfull_queue(udev, true); 2239892782caSMike Christie 2240892782caSMike Christie unlock: 2241892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2242892782caSMike Christie } 2243892782caSMike Christie 2244892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2245892782caSMike Christie { 2246892782caSMike Christie struct tcmu_mailbox *mb; 2247892782caSMike Christie struct tcmu_cmd *cmd; 2248d3cbb743SBodo Stroesser unsigned long i; 2249892782caSMike Christie 2250892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2251892782caSMike Christie 2252d3cbb743SBodo Stroesser xa_for_each(&udev->commands, i, cmd) { 2253892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2254892782caSMike Christie cmd->cmd_id, udev->name, 2255892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2256892782caSMike Christie 2257d3cbb743SBodo Stroesser xa_erase(&udev->commands, i); 2258892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2259a86a7586SDmitry Fomichev WARN_ON(!cmd->se_cmd); 2260a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2261780e1384SShin'ichiro Kawasaki cmd->se_cmd->priv = NULL; 2262892782caSMike Christie if (err_level == 1) { 2263892782caSMike Christie /* 2264892782caSMike Christie * Userspace was not able to start the 2265892782caSMike Christie * command or it is retryable. 2266892782caSMike Christie */ 2267892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2268892782caSMike Christie } else { 2269892782caSMike Christie /* hard failure */ 2270892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2271892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2272892782caSMike Christie } 2273892782caSMike Christie } 2274892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2275892782caSMike Christie tcmu_free_cmd(cmd); 2276892782caSMike Christie } 2277892782caSMike Christie 2278892782caSMike Christie mb = udev->mb_addr; 2279892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2280892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2281892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2282892782caSMike Christie 2283892782caSMike Christie udev->cmdr_last_cleaned = 0; 2284892782caSMike Christie mb->cmd_tail = 0; 2285892782caSMike Christie mb->cmd_head = 0; 2286892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2287066f79a5SBodo Stroesser clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 2288892782caSMike Christie 2289892782caSMike Christie del_timer(&udev->cmd_timer); 2290892782caSMike Christie 2291bc2d214aSBodo Stroesser /* 2292bc2d214aSBodo Stroesser * ring is empty and qfull queue never contains aborted commands. 2293bc2d214aSBodo Stroesser * So TMRs in tmr queue do not contain relevant cmd_ids. 2294bc2d214aSBodo Stroesser * After a ring reset userspace should do a fresh start, so 2295bc2d214aSBodo Stroesser * even LUN RESET message is no longer relevant. 2296bc2d214aSBodo Stroesser * Therefore remove all TMRs from qfull queue 2297bc2d214aSBodo Stroesser */ 2298bc2d214aSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 2299bc2d214aSBodo Stroesser 230061fb2482SBodo Stroesser run_qfull_queue(udev, false); 230161fb2482SBodo Stroesser 2302892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2303892782caSMike Christie } 2304892782caSMike Christie 23057c9e7a6fSAndy Grover enum { 23063abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 230780eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 23087c9e7a6fSAndy Grover }; 23097c9e7a6fSAndy Grover 23107c9e7a6fSAndy Grover static match_table_t tokens = { 23117c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 23120e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2313b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2314b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2315b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2316c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 23177c9e7a6fSAndy Grover {Opt_err, NULL} 23187c9e7a6fSAndy Grover }; 23197c9e7a6fSAndy Grover 23203abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 23213abaa2bfSMike Christie { 2322b60cb1f8SMike Christie int val, ret; 23233abaa2bfSMike Christie 2324b60cb1f8SMike Christie ret = match_int(arg, &val); 23253abaa2bfSMike Christie if (ret < 0) { 2326b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2327b60cb1f8SMike Christie ret); 23283abaa2bfSMike Christie return ret; 23293abaa2bfSMike Christie } 2330b60cb1f8SMike Christie 2331b60cb1f8SMike Christie if (val <= 0) { 2332b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2333b60cb1f8SMike Christie val); 23343abaa2bfSMike Christie return -EINVAL; 23353abaa2bfSMike Christie } 2336b60cb1f8SMike Christie *dev_attrib = val; 23373abaa2bfSMike Christie return 0; 23383abaa2bfSMike Christie } 23393abaa2bfSMike Christie 2340c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2341c97840c8SMike Christie { 2342c97840c8SMike Christie int val, ret; 2343c97840c8SMike Christie 2344c97840c8SMike Christie ret = match_int(arg, &val); 2345c97840c8SMike Christie if (ret < 0) { 2346c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2347c97840c8SMike Christie ret); 2348c97840c8SMike Christie return ret; 2349c97840c8SMike Christie } 2350c97840c8SMike Christie 2351c97840c8SMike Christie if (val <= 0) { 2352c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2353c97840c8SMike Christie return -EINVAL; 2354c97840c8SMike Christie } 2355c97840c8SMike Christie 2356c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2357c97840c8SMike Christie if (udev->data_bitmap) { 2358c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2359c97840c8SMike Christie ret = -EINVAL; 2360c97840c8SMike Christie goto unlock; 2361c97840c8SMike Christie } 2362c97840c8SMike Christie 2363c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2364c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2365c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2366c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2367c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2368c97840c8SMike Christie } 2369c97840c8SMike Christie 2370c97840c8SMike Christie unlock: 2371c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2372c97840c8SMike Christie return ret; 2373c97840c8SMike Christie } 2374c97840c8SMike Christie 23757c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 23767c9e7a6fSAndy Grover const char *page, ssize_t count) 23777c9e7a6fSAndy Grover { 23787c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 23790e0d7526SMike Christie char *orig, *ptr, *opts; 23807c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2381c97840c8SMike Christie int ret = 0, token; 23827c9e7a6fSAndy Grover 23837c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 23847c9e7a6fSAndy Grover if (!opts) 23857c9e7a6fSAndy Grover return -ENOMEM; 23867c9e7a6fSAndy Grover 23877c9e7a6fSAndy Grover orig = opts; 23887c9e7a6fSAndy Grover 23897c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 23907c9e7a6fSAndy Grover if (!*ptr) 23917c9e7a6fSAndy Grover continue; 23927c9e7a6fSAndy Grover 23937c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 23947c9e7a6fSAndy Grover switch (token) { 23957c9e7a6fSAndy Grover case Opt_dev_config: 23967c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 23977c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 23987c9e7a6fSAndy Grover ret = -EINVAL; 23997c9e7a6fSAndy Grover break; 24007c9e7a6fSAndy Grover } 24017c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 24027c9e7a6fSAndy Grover break; 24037c9e7a6fSAndy Grover case Opt_dev_size: 24040e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 24057c9e7a6fSAndy Grover if (ret < 0) 24060e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 24070e0d7526SMike Christie ret); 24087c9e7a6fSAndy Grover break; 24099c1cd1b6SAndy Grover case Opt_hw_block_size: 24103abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 24113abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 24129c1cd1b6SAndy Grover break; 24133abaa2bfSMike Christie case Opt_hw_max_sectors: 24143abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 24153abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 24169c1cd1b6SAndy Grover break; 2417b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2418b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2419b849b456SKenjiro Nakayama if (ret < 0) 2420b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2421b60cb1f8SMike Christie ret); 2422b849b456SKenjiro Nakayama break; 242380eb8761SMike Christie case Opt_max_data_area_mb: 2424c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 242580eb8761SMike Christie break; 24267c9e7a6fSAndy Grover default: 24277c9e7a6fSAndy Grover break; 24287c9e7a6fSAndy Grover } 24292579325cSMike Christie 24302579325cSMike Christie if (ret) 24312579325cSMike Christie break; 24327c9e7a6fSAndy Grover } 24337c9e7a6fSAndy Grover 24347c9e7a6fSAndy Grover kfree(orig); 24357c9e7a6fSAndy Grover return (!ret) ? count : ret; 24367c9e7a6fSAndy Grover } 24377c9e7a6fSAndy Grover 24387c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 24397c9e7a6fSAndy Grover { 24407c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 24417c9e7a6fSAndy Grover ssize_t bl = 0; 24427c9e7a6fSAndy Grover 24437c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 24447c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 24450e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 244680eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 244780eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 24487c9e7a6fSAndy Grover 24497c9e7a6fSAndy Grover return bl; 24507c9e7a6fSAndy Grover } 24517c9e7a6fSAndy Grover 24527c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 24537c9e7a6fSAndy Grover { 24547c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 24557c9e7a6fSAndy Grover 24567c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 24577c9e7a6fSAndy Grover dev->dev_attrib.block_size); 24587c9e7a6fSAndy Grover } 24597c9e7a6fSAndy Grover 24607c9e7a6fSAndy Grover static sense_reason_t 24617c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 24627c9e7a6fSAndy Grover { 246302eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 24649c1cd1b6SAndy Grover } 24659c1cd1b6SAndy Grover 24667d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 24677d7a7435SNicholas Bellinger { 24687d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24697d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2470b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24717d7a7435SNicholas Bellinger 24727d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 24737d7a7435SNicholas Bellinger } 24747d7a7435SNicholas Bellinger 24757d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 24767d7a7435SNicholas Bellinger size_t count) 24777d7a7435SNicholas Bellinger { 24787d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24797d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 24807d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 24817d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 24827d7a7435SNicholas Bellinger u32 val; 24837d7a7435SNicholas Bellinger int ret; 24847d7a7435SNicholas Bellinger 24857d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 24867d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 24877d7a7435SNicholas Bellinger return -EINVAL; 24887d7a7435SNicholas Bellinger } 24897d7a7435SNicholas Bellinger 24907d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 24917d7a7435SNicholas Bellinger if (ret < 0) 24927d7a7435SNicholas Bellinger return ret; 24937d7a7435SNicholas Bellinger 24947d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 24957d7a7435SNicholas Bellinger return count; 24967d7a7435SNicholas Bellinger } 24977d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 24987d7a7435SNicholas Bellinger 24999103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 25009103575aSMike Christie { 25019103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 25029103575aSMike Christie struct se_dev_attrib, da_group); 25039103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25049103575aSMike Christie 25059103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 25069103575aSMike Christie udev->qfull_time_out : 25079103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 25089103575aSMike Christie } 25099103575aSMike Christie 25109103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 25119103575aSMike Christie const char *page, size_t count) 25129103575aSMike Christie { 25139103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 25149103575aSMike Christie struct se_dev_attrib, da_group); 25159103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25169103575aSMike Christie s32 val; 25179103575aSMike Christie int ret; 25189103575aSMike Christie 25199103575aSMike Christie ret = kstrtos32(page, 0, &val); 25209103575aSMike Christie if (ret < 0) 25219103575aSMike Christie return ret; 25229103575aSMike Christie 25239103575aSMike Christie if (val >= 0) { 25249103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2525125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2526125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 25279103575aSMike Christie } else { 25289103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 25299103575aSMike Christie return -EINVAL; 25309103575aSMike Christie } 25319103575aSMike Christie return count; 25329103575aSMike Christie } 25339103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 25349103575aSMike Christie 253580eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 253680eb8761SMike Christie { 253780eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 253880eb8761SMike Christie struct se_dev_attrib, da_group); 253980eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 254080eb8761SMike Christie 254180eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 254280eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 254380eb8761SMike Christie } 254480eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 254580eb8761SMike Christie 25462d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2547ee018252SBryant G. Ly { 2548ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2549ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2550ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2551ee018252SBryant G. Ly 2552ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2553ee018252SBryant G. Ly } 2554ee018252SBryant G. Ly 255502ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 255602ccfb54SZhu Lingshan const char *reconfig_data) 255702ccfb54SZhu Lingshan { 255802ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 255902ccfb54SZhu Lingshan void *msg_header = NULL; 256002ccfb54SZhu Lingshan int ret = 0; 256102ccfb54SZhu Lingshan 256202ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 256302ccfb54SZhu Lingshan &skb, &msg_header); 256402ccfb54SZhu Lingshan if (ret < 0) 256502ccfb54SZhu Lingshan return ret; 256602ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 256702ccfb54SZhu Lingshan if (ret < 0) { 256802ccfb54SZhu Lingshan nlmsg_free(skb); 256902ccfb54SZhu Lingshan return ret; 257002ccfb54SZhu Lingshan } 257102ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 257206add777SMike Christie skb, msg_header); 257302ccfb54SZhu Lingshan } 257402ccfb54SZhu Lingshan 257502ccfb54SZhu Lingshan 25762d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2577ee018252SBryant G. Ly size_t count) 2578ee018252SBryant G. Ly { 2579ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2580ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2581ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25822d76443eSMike Christie int ret, len; 2583ee018252SBryant G. Ly 25842d76443eSMike Christie len = strlen(page); 25852d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2586ee018252SBryant G. Ly return -EINVAL; 2587ee018252SBryant G. Ly 2588ee018252SBryant G. Ly /* Check if device has been configured before */ 258963d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 259002ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2591ee018252SBryant G. Ly if (ret) { 2592ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2593ee018252SBryant G. Ly return ret; 2594ee018252SBryant G. Ly } 2595de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2596de8c5221SBryant G. Ly 2597de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2598de8c5221SBryant G. Ly if (ret) 2599de8c5221SBryant G. Ly return ret; 2600de8c5221SBryant G. Ly return count; 2601ee018252SBryant G. Ly } 26022d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2603ee018252SBryant G. Ly 2604ee018252SBryant G. Ly return count; 2605ee018252SBryant G. Ly } 26062d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2607ee018252SBryant G. Ly 2608801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2609801fc54dSBryant G. Ly { 2610801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2611801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2612801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2613801fc54dSBryant G. Ly 26140e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2615801fc54dSBryant G. Ly } 2616801fc54dSBryant G. Ly 261784e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 261884e28506SZhu Lingshan { 261984e28506SZhu Lingshan struct sk_buff *skb = NULL; 262084e28506SZhu Lingshan void *msg_header = NULL; 262184e28506SZhu Lingshan int ret = 0; 262284e28506SZhu Lingshan 262384e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 262484e28506SZhu Lingshan &skb, &msg_header); 262584e28506SZhu Lingshan if (ret < 0) 262684e28506SZhu Lingshan return ret; 262784e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 262884e28506SZhu Lingshan size, TCMU_ATTR_PAD); 262984e28506SZhu Lingshan if (ret < 0) { 263084e28506SZhu Lingshan nlmsg_free(skb); 263184e28506SZhu Lingshan return ret; 263284e28506SZhu Lingshan } 263384e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 263406add777SMike Christie skb, msg_header); 263584e28506SZhu Lingshan } 263684e28506SZhu Lingshan 2637801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2638801fc54dSBryant G. Ly size_t count) 2639801fc54dSBryant G. Ly { 2640801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2641801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2642801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 26432d76443eSMike Christie u64 val; 2644801fc54dSBryant G. Ly int ret; 2645801fc54dSBryant G. Ly 26462d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2647801fc54dSBryant G. Ly if (ret < 0) 2648801fc54dSBryant G. Ly return ret; 2649801fc54dSBryant G. Ly 2650801fc54dSBryant G. Ly /* Check if device has been configured before */ 265163d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 265284e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2653801fc54dSBryant G. Ly if (ret) { 2654801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2655801fc54dSBryant G. Ly return ret; 2656801fc54dSBryant G. Ly } 2657801fc54dSBryant G. Ly } 26582d76443eSMike Christie udev->dev_size = val; 2659801fc54dSBryant G. Ly return count; 2660801fc54dSBryant G. Ly } 2661801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2662801fc54dSBryant G. Ly 2663b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2664b849b456SKenjiro Nakayama char *page) 2665b849b456SKenjiro Nakayama { 2666b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2667b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2668b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2669b849b456SKenjiro Nakayama 2670b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2671b849b456SKenjiro Nakayama } 2672b849b456SKenjiro Nakayama 2673b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2674b849b456SKenjiro Nakayama const char *page, size_t count) 2675b849b456SKenjiro Nakayama { 2676b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2677b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2678b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2679b849b456SKenjiro Nakayama s8 val; 2680b849b456SKenjiro Nakayama int ret; 2681b849b456SKenjiro Nakayama 2682b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2683b849b456SKenjiro Nakayama if (ret < 0) 2684b849b456SKenjiro Nakayama return ret; 2685b849b456SKenjiro Nakayama 2686b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2687b849b456SKenjiro Nakayama return count; 2688b849b456SKenjiro Nakayama } 2689b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2690b849b456SKenjiro Nakayama 26919a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 26929a8bb606SBryant G. Ly char *page) 26939a8bb606SBryant G. Ly { 26949a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 26959a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 26969a8bb606SBryant G. Ly 26979a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 26989a8bb606SBryant G. Ly } 26999a8bb606SBryant G. Ly 270033d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 270133d065ccSZhu Lingshan { 270233d065ccSZhu Lingshan struct sk_buff *skb = NULL; 270333d065ccSZhu Lingshan void *msg_header = NULL; 270433d065ccSZhu Lingshan int ret = 0; 270533d065ccSZhu Lingshan 270633d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 270733d065ccSZhu Lingshan &skb, &msg_header); 270833d065ccSZhu Lingshan if (ret < 0) 270933d065ccSZhu Lingshan return ret; 271033d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 271133d065ccSZhu Lingshan if (ret < 0) { 271233d065ccSZhu Lingshan nlmsg_free(skb); 271333d065ccSZhu Lingshan return ret; 271433d065ccSZhu Lingshan } 271533d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 271606add777SMike Christie skb, msg_header); 271733d065ccSZhu Lingshan } 271833d065ccSZhu Lingshan 27199a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 27209a8bb606SBryant G. Ly const char *page, size_t count) 27219a8bb606SBryant G. Ly { 27229a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 27239a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 27241068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 27252d76443eSMike Christie u8 val; 27269a8bb606SBryant G. Ly int ret; 27279a8bb606SBryant G. Ly 27282d76443eSMike Christie ret = kstrtou8(page, 0, &val); 27299a8bb606SBryant G. Ly if (ret < 0) 27309a8bb606SBryant G. Ly return ret; 27319a8bb606SBryant G. Ly 27321068be7bSBryant G. Ly /* Check if device has been configured before */ 273363d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 273433d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 27351068be7bSBryant G. Ly if (ret) { 27361068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 27371068be7bSBryant G. Ly return ret; 27381068be7bSBryant G. Ly } 27391068be7bSBryant G. Ly } 27402d76443eSMike Christie 27412d76443eSMike Christie da->emulate_write_cache = val; 27429a8bb606SBryant G. Ly return count; 27439a8bb606SBryant G. Ly } 27449a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 27459a8bb606SBryant G. Ly 274659526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) 274759526d7aSBodo Stroesser { 274859526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 274959526d7aSBodo Stroesser struct se_dev_attrib, da_group); 275059526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 275159526d7aSBodo Stroesser 275259526d7aSBodo Stroesser return snprintf(page, PAGE_SIZE, "%i\n", 275359526d7aSBodo Stroesser test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); 275459526d7aSBodo Stroesser } 275559526d7aSBodo Stroesser 275659526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_store(struct config_item *item, 275759526d7aSBodo Stroesser const char *page, size_t count) 275859526d7aSBodo Stroesser { 275959526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 276059526d7aSBodo Stroesser struct se_dev_attrib, da_group); 276159526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 276259526d7aSBodo Stroesser u8 val; 276359526d7aSBodo Stroesser int ret; 276459526d7aSBodo Stroesser 276559526d7aSBodo Stroesser ret = kstrtou8(page, 0, &val); 276659526d7aSBodo Stroesser if (ret < 0) 276759526d7aSBodo Stroesser return ret; 276859526d7aSBodo Stroesser if (val > 1) 276959526d7aSBodo Stroesser return -EINVAL; 277059526d7aSBodo Stroesser 277159526d7aSBodo Stroesser if (val) 277259526d7aSBodo Stroesser set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 277359526d7aSBodo Stroesser else 277459526d7aSBodo Stroesser clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 277559526d7aSBodo Stroesser return count; 277659526d7aSBodo Stroesser } 277759526d7aSBodo Stroesser CONFIGFS_ATTR(tcmu_, tmr_notification); 277859526d7aSBodo Stroesser 2779892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2780892782caSMike Christie { 2781892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2782892782caSMike Christie struct se_device, 2783892782caSMike Christie dev_action_group); 2784892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2785892782caSMike Christie 2786892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2787892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2788892782caSMike Christie else 2789892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2790892782caSMike Christie } 2791892782caSMike Christie 2792892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2793892782caSMike Christie size_t count) 2794892782caSMike Christie { 2795892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2796892782caSMike Christie struct se_device, 2797892782caSMike Christie dev_action_group); 2798892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2799892782caSMike Christie u8 val; 2800892782caSMike Christie int ret; 2801892782caSMike Christie 2802a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2803a30b0473SMike Christie pr_err("Device is not configured.\n"); 2804a30b0473SMike Christie return -EINVAL; 2805a30b0473SMike Christie } 2806a30b0473SMike Christie 2807892782caSMike Christie ret = kstrtou8(page, 0, &val); 2808892782caSMike Christie if (ret < 0) 2809892782caSMike Christie return ret; 2810892782caSMike Christie 2811892782caSMike Christie if (val > 1) { 2812892782caSMike Christie pr_err("Invalid block value %d\n", val); 2813892782caSMike Christie return -EINVAL; 2814892782caSMike Christie } 2815892782caSMike Christie 2816892782caSMike Christie if (!val) 2817892782caSMike Christie tcmu_unblock_dev(udev); 2818892782caSMike Christie else 2819892782caSMike Christie tcmu_block_dev(udev); 2820892782caSMike Christie return count; 2821892782caSMike Christie } 2822892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2823892782caSMike Christie 2824892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2825892782caSMike Christie size_t count) 2826892782caSMike Christie { 2827892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2828892782caSMike Christie struct se_device, 2829892782caSMike Christie dev_action_group); 2830892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2831892782caSMike Christie u8 val; 2832892782caSMike Christie int ret; 2833892782caSMike Christie 2834a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2835a30b0473SMike Christie pr_err("Device is not configured.\n"); 2836a30b0473SMike Christie return -EINVAL; 2837a30b0473SMike Christie } 2838a30b0473SMike Christie 2839892782caSMike Christie ret = kstrtou8(page, 0, &val); 2840892782caSMike Christie if (ret < 0) 2841892782caSMike Christie return ret; 2842892782caSMike Christie 2843892782caSMike Christie if (val != 1 && val != 2) { 2844892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2845892782caSMike Christie return -EINVAL; 2846892782caSMike Christie } 2847892782caSMike Christie 2848892782caSMike Christie tcmu_reset_ring(udev, val); 2849892782caSMike Christie return count; 2850892782caSMike Christie } 2851892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2852892782caSMike Christie 28535821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2854801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 28559103575aSMike Christie &tcmu_attr_qfull_time_out, 285680eb8761SMike Christie &tcmu_attr_max_data_area_mb, 28572d76443eSMike Christie &tcmu_attr_dev_config, 2858801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2859801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 286059526d7aSBodo Stroesser &tcmu_attr_tmr_notification, 2861b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2862801fc54dSBryant G. Ly NULL, 2863801fc54dSBryant G. Ly }; 2864801fc54dSBryant G. Ly 28657d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 28667d7a7435SNicholas Bellinger 2867892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2868892782caSMike Christie &tcmu_attr_block_dev, 2869892782caSMike Christie &tcmu_attr_reset_ring, 2870892782caSMike Christie NULL, 2871892782caSMike Christie }; 2872892782caSMike Christie 28737d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 28747c9e7a6fSAndy Grover .name = "user", 28757c9e7a6fSAndy Grover .owner = THIS_MODULE, 287669088a04SBodo Stroesser .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, 2877356ba2a8SBodo Stroesser .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | 2878356ba2a8SBodo Stroesser TRANSPORT_FLAG_PASSTHROUGH_ALUA, 28797c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 28807c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 28817c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 28827c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 288392634706SMike Christie .destroy_device = tcmu_destroy_device, 28847c9e7a6fSAndy Grover .free_device = tcmu_free_device, 28856888da81SMike Christie .unplug_device = tcmu_unplug_device, 28866888da81SMike Christie .plug_device = tcmu_plug_device, 28877c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 2888bc2d214aSBodo Stroesser .tmr_notify = tcmu_tmr_notify, 28897c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 28907c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 28917c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 28927c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2893892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 28947c9e7a6fSAndy Grover }; 28957c9e7a6fSAndy Grover 289689ec9cfdSMike Christie static void find_free_blocks(void) 2897b6df4b79SXiubo Li { 2898b6df4b79SXiubo Li struct tcmu_dev *udev; 2899b6df4b79SXiubo Li loff_t off; 2900af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2901af1dd7ffSMike Christie 290280eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2903af1dd7ffSMike Christie return; 2904b6df4b79SXiubo Li 2905b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2906b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2907b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2908b6df4b79SXiubo Li 2909dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2910dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2911dc335a99SMike Christie continue; 2912dc335a99SMike Christie } 2913dc335a99SMike Christie 2914b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2915bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 2916bc2d214aSBodo Stroesser run_qfull_queue(udev, false); 2917b6df4b79SXiubo Li 2918af1dd7ffSMike Christie /* Skip the udevs in idle */ 2919af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2920b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2921b6df4b79SXiubo Li continue; 2922b6df4b79SXiubo Li } 2923b6df4b79SXiubo Li 2924b6df4b79SXiubo Li end = udev->dbi_max + 1; 2925b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2926b6df4b79SXiubo Li if (block == udev->dbi_max) { 2927b6df4b79SXiubo Li /* 2928af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2929af1dd7ffSMike Christie * reclaim any blocks. 2930b6df4b79SXiubo Li */ 2931b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2932b6df4b79SXiubo Li continue; 2933b6df4b79SXiubo Li } else if (block == end) { 2934b6df4b79SXiubo Li /* The current udev will goto idle state */ 2935b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2936b6df4b79SXiubo Li udev->dbi_max = 0; 2937b6df4b79SXiubo Li } else { 2938b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2939b6df4b79SXiubo Li udev->dbi_max = block; 2940b6df4b79SXiubo Li } 2941b6df4b79SXiubo Li 2942b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2943b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2944b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2945b6df4b79SXiubo Li 2946b6df4b79SXiubo Li /* Release the block pages */ 2947*f7c89771SBodo Stroesser tcmu_blocks_release(&udev->data_blocks, start, end - 1); 2948b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2949af1dd7ffSMike Christie 2950af1dd7ffSMike Christie total_freed += end - start; 2951af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2952af1dd7ffSMike Christie total_freed, udev->name); 2953b6df4b79SXiubo Li } 295489ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 295589ec9cfdSMike Christie 295680eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2957af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2958b6df4b79SXiubo Li } 2959b6df4b79SXiubo Li 2960488ebe4cSMike Christie static void check_timedout_devices(void) 2961488ebe4cSMike Christie { 2962488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 296361fb2482SBodo Stroesser struct tcmu_cmd *cmd, *tmp_cmd; 2964488ebe4cSMike Christie LIST_HEAD(devs); 2965488ebe4cSMike Christie 2966488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2967488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2968488ebe4cSMike Christie 2969488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2970488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2971488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2972488ebe4cSMike Christie 29736fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2974a94a2572SXiubo Li 297561fb2482SBodo Stroesser /* 297661fb2482SBodo Stroesser * If cmd_time_out is disabled but qfull is set deadline 297761fb2482SBodo Stroesser * will only reflect the qfull timeout. Ignore it. 297861fb2482SBodo Stroesser */ 297961fb2482SBodo Stroesser if (udev->cmd_time_out) { 298061fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, 298161fb2482SBodo Stroesser &udev->inflight_queue, 298261fb2482SBodo Stroesser queue_entry) { 298361fb2482SBodo Stroesser tcmu_check_expired_ring_cmd(cmd); 298461fb2482SBodo Stroesser } 298561fb2482SBodo Stroesser tcmu_set_next_deadline(&udev->inflight_queue, 298661fb2482SBodo Stroesser &udev->cmd_timer); 298761fb2482SBodo Stroesser } 298861fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, 298961fb2482SBodo Stroesser queue_entry) { 299061fb2482SBodo Stroesser tcmu_check_expired_queue_cmd(cmd); 299161fb2482SBodo Stroesser } 2992a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2993a94a2572SXiubo Li 29946fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2995488ebe4cSMike Christie 2996488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2997488ebe4cSMike Christie } 2998488ebe4cSMike Christie 2999488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 3000488ebe4cSMike Christie } 3001488ebe4cSMike Christie 30029972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 300389ec9cfdSMike Christie { 3004488ebe4cSMike Christie check_timedout_devices(); 300589ec9cfdSMike Christie find_free_blocks(); 300689ec9cfdSMike Christie } 300789ec9cfdSMike Christie 30087c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 30097c9e7a6fSAndy Grover { 3010801fc54dSBryant G. Ly int ret, i, k, len = 0; 30117c9e7a6fSAndy Grover 30127c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 30137c9e7a6fSAndy Grover 3014af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 30159972cebbSMike Christie 30167c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 30177c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 30187c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 30197c9e7a6fSAndy Grover 0, NULL); 30207c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 30217c9e7a6fSAndy Grover return -ENOMEM; 30227c9e7a6fSAndy Grover 30237c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 30247c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 30257c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 30267c9e7a6fSAndy Grover goto out_free_cache; 30277c9e7a6fSAndy Grover } 30287c9e7a6fSAndy Grover 30297c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 30307c9e7a6fSAndy Grover if (ret < 0) { 30317c9e7a6fSAndy Grover goto out_unreg_device; 30327c9e7a6fSAndy Grover } 30337c9e7a6fSAndy Grover 30344703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 30357d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 30364703b625SBodo Stroesser for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) 3037801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 30384703b625SBodo Stroesser for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) 30394703b625SBodo Stroesser len += sizeof(struct configfs_attribute *); 3040801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 30417d7a7435SNicholas Bellinger 30427d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 30437d7a7435SNicholas Bellinger if (!tcmu_attrs) { 30447d7a7435SNicholas Bellinger ret = -ENOMEM; 30457d7a7435SNicholas Bellinger goto out_unreg_genl; 30467d7a7435SNicholas Bellinger } 30477d7a7435SNicholas Bellinger 30484703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 30497d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 30504703b625SBodo Stroesser for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) 30514703b625SBodo Stroesser tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; 30524703b625SBodo Stroesser for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) 30534703b625SBodo Stroesser tcmu_attrs[i++] = tcmu_attrib_attrs[k]; 30547d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 30557d7a7435SNicholas Bellinger 30560a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 30577c9e7a6fSAndy Grover if (ret) 30587d7a7435SNicholas Bellinger goto out_attrs; 30597c9e7a6fSAndy Grover 30607c9e7a6fSAndy Grover return 0; 30617c9e7a6fSAndy Grover 30627d7a7435SNicholas Bellinger out_attrs: 30637d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30647c9e7a6fSAndy Grover out_unreg_genl: 30657c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30667c9e7a6fSAndy Grover out_unreg_device: 30677c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30687c9e7a6fSAndy Grover out_free_cache: 30697c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30707c9e7a6fSAndy Grover 30717c9e7a6fSAndy Grover return ret; 30727c9e7a6fSAndy Grover } 30737c9e7a6fSAndy Grover 30747c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 30757c9e7a6fSAndy Grover { 3076af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 30770a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 30787d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30797c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30807c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30817c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30827c9e7a6fSAndy Grover } 30837c9e7a6fSAndy Grover 30847c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 30857c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 30867c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 30877c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 30887c9e7a6fSAndy Grover 30897c9e7a6fSAndy Grover module_init(tcmu_module_init); 30907c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 3091