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 63*ecddbb7eSBodo Stroesser /* For mailbox plus cmd ring, the size is fixed 8MB */ 64*ecddbb7eSBodo Stroesser #define MB_CMDR_SIZE (8 * 1024 * 1024) 65*ecddbb7eSBodo Stroesser /* Offset of cmd ring is size of mailbox */ 66*ecddbb7eSBodo Stroesser #define CMDR_OFF sizeof(struct tcmu_mailbox) 67*ecddbb7eSBodo Stroesser #define CMDR_SIZE (MB_CMDR_SIZE - CMDR_OFF) 6826418649SSheng Yang 69b6df4b79SXiubo Li /* 70b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 71b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 72b6df4b79SXiubo Li */ 73b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 7480eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 7580eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 767c9e7a6fSAndy Grover 7780eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 7880eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 7980eb8761SMike Christie 80af1dd7ffSMike Christie /* 81af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 82af1dd7ffSMike Christie * when the unmap thread will be started. 83af1dd7ffSMike Christie */ 8480eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 85b6df4b79SXiubo Li 86b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 87bdaeedc1SMike Christie static u8 tcmu_netlink_blocked; 88b3af66e2SMike Christie 897c9e7a6fSAndy Grover static struct device *tcmu_root_device; 907c9e7a6fSAndy Grover 917c9e7a6fSAndy Grover struct tcmu_hba { 927c9e7a6fSAndy Grover u32 host_id; 937c9e7a6fSAndy Grover }; 947c9e7a6fSAndy Grover 957c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 967c9e7a6fSAndy Grover 973228691fSMike Christie static DEFINE_MUTEX(tcmu_nl_cmd_mutex); 983228691fSMike Christie static LIST_HEAD(tcmu_nl_cmd_list); 993228691fSMike Christie 1003228691fSMike Christie struct tcmu_dev; 1013228691fSMike Christie 102b3af66e2SMike Christie struct tcmu_nl_cmd { 103b3af66e2SMike Christie /* wake up thread waiting for reply */ 104b3af66e2SMike Christie struct completion complete; 1053228691fSMike Christie struct list_head nl_list; 1063228691fSMike Christie struct tcmu_dev *udev; 107b3af66e2SMike Christie int cmd; 108b3af66e2SMike Christie int status; 109b3af66e2SMike Christie }; 110b3af66e2SMike Christie 1117c9e7a6fSAndy Grover struct tcmu_dev { 112b6df4b79SXiubo Li struct list_head node; 113f3cdbe39SMike Christie struct kref kref; 114af1dd7ffSMike Christie 1157c9e7a6fSAndy Grover struct se_device se_dev; 1166888da81SMike Christie struct se_dev_plug se_plug; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover char *name; 1197c9e7a6fSAndy Grover struct se_hba *hba; 1207c9e7a6fSAndy Grover 1217c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1227c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 123892782caSMike Christie #define TCMU_DEV_BIT_BLOCKED 2 12459526d7aSBodo Stroesser #define TCMU_DEV_BIT_TMR_NOTIFY 3 1256888da81SMike Christie #define TCM_DEV_BIT_PLUGGED 4 1267c9e7a6fSAndy Grover unsigned long flags; 1277c9e7a6fSAndy Grover 1287c9e7a6fSAndy Grover struct uio_info uio_info; 1297c9e7a6fSAndy Grover 130b6df4b79SXiubo Li struct inode *inode; 131b6df4b79SXiubo Li 1320e0d7526SMike Christie uint64_t dev_size; 133*ecddbb7eSBodo Stroesser 134*ecddbb7eSBodo Stroesser struct tcmu_mailbox *mb_addr; 135*ecddbb7eSBodo Stroesser void *cmdr; 1367c9e7a6fSAndy Grover u32 cmdr_size; 1377c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1383d9b9555SAndy Grover /* Offset of data area from start of mb */ 13926418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1407c9e7a6fSAndy Grover size_t data_off; 1417c9e7a6fSAndy Grover size_t data_size; 14280eb8761SMike Christie uint32_t max_blocks; 143*ecddbb7eSBodo Stroesser size_t mmap_pages; 14426418649SSheng Yang 145b6df4b79SXiubo Li struct mutex cmdr_lock; 146a94a2572SXiubo Li struct list_head qfull_queue; 147bc2d214aSBodo Stroesser struct list_head tmr_queue; 1487c9e7a6fSAndy Grover 149141685a3SXiubo Li uint32_t dbi_max; 150b6df4b79SXiubo Li uint32_t dbi_thresh; 15180eb8761SMike Christie unsigned long *data_bitmap; 152f7c89771SBodo Stroesser struct xarray data_blocks; 153141685a3SXiubo Li 154d3cbb743SBodo Stroesser struct xarray commands; 1557c9e7a6fSAndy Grover 1569103575aSMike Christie struct timer_list cmd_timer; 157af980e46SMike Christie unsigned int cmd_time_out; 158a94a2572SXiubo Li struct list_head inflight_queue; 1599103575aSMike Christie 1609103575aSMike Christie struct timer_list qfull_timer; 1619103575aSMike Christie int qfull_time_out; 1629103575aSMike Christie 163488ebe4cSMike Christie struct list_head timedout_entry; 1647c9e7a6fSAndy Grover 165b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 166b3af66e2SMike Christie 1677c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 168b849b456SKenjiro Nakayama 169b849b456SKenjiro Nakayama int nl_reply_supported; 1707c9e7a6fSAndy Grover }; 1717c9e7a6fSAndy Grover 1727c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1737c9e7a6fSAndy Grover 1747c9e7a6fSAndy Grover struct tcmu_cmd { 1757c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1767c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 177a94a2572SXiubo Li struct list_head queue_entry; 1787c9e7a6fSAndy Grover 1797c9e7a6fSAndy Grover uint16_t cmd_id; 1807c9e7a6fSAndy Grover 18126418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1827c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 183141685a3SXiubo Li uint32_t dbi_cnt; 18452ef2743SBodo Stroesser uint32_t dbi_bidi_cnt; 185141685a3SXiubo Li uint32_t dbi_cur; 186141685a3SXiubo Li uint32_t *dbi; 1877c9e7a6fSAndy Grover 1883c9a7c58SBodo Stroesser uint32_t data_len_bidi; 1893c9a7c58SBodo Stroesser 1907c9e7a6fSAndy Grover unsigned long deadline; 1917c9e7a6fSAndy Grover 1927c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1937c9e7a6fSAndy Grover unsigned long flags; 1947c9e7a6fSAndy Grover }; 195bc2d214aSBodo Stroesser 196bc2d214aSBodo Stroesser struct tcmu_tmr { 197bc2d214aSBodo Stroesser struct list_head queue_entry; 198bc2d214aSBodo Stroesser 199bc2d214aSBodo Stroesser uint8_t tmr_type; 200bc2d214aSBodo Stroesser uint32_t tmr_cmd_cnt; 2018fdaabe1SGustavo A. R. Silva int16_t tmr_cmd_ids[]; 202bc2d214aSBodo Stroesser }; 203bc2d214aSBodo Stroesser 204af1dd7ffSMike Christie /* 205af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 206af1dd7ffSMike Christie * 207af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 208af1dd7ffSMike Christie * ... 209af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 210af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 211af1dd7ffSMike Christie * ... 212af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 213af1dd7ffSMike Christie */ 214b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 215b6df4b79SXiubo Li static LIST_HEAD(root_udev); 216b6df4b79SXiubo Li 217488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 218488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 219488ebe4cSMike Christie 22080eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 22180eb8761SMike Christie 222b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 223af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 22480eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 225b6df4b79SXiubo Li 22680eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 22780eb8761SMike Christie const struct kernel_param *kp) 22880eb8761SMike Christie { 22980eb8761SMike Christie int ret, max_area_mb; 23080eb8761SMike Christie 23180eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 23280eb8761SMike Christie if (ret) 23380eb8761SMike Christie return -EINVAL; 23480eb8761SMike Christie 23580eb8761SMike Christie if (max_area_mb <= 0) { 23680eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 23780eb8761SMike Christie return -EINVAL; 23880eb8761SMike Christie } 23980eb8761SMike Christie 24080eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 24180eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 24280eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 24380eb8761SMike Christie else 24480eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 24580eb8761SMike Christie 24680eb8761SMike Christie return 0; 24780eb8761SMike Christie } 24880eb8761SMike Christie 24980eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 25080eb8761SMike Christie const struct kernel_param *kp) 25180eb8761SMike Christie { 2526d70cb34SXiongfeng Wang return sprintf(buffer, "%d\n", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 25380eb8761SMike Christie } 25480eb8761SMike Christie 25580eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 25680eb8761SMike Christie .set = tcmu_set_global_max_data_area, 25780eb8761SMike Christie .get = tcmu_get_global_max_data_area, 25880eb8761SMike Christie }; 25980eb8761SMike Christie 26080eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 26180eb8761SMike Christie S_IWUSR | S_IRUGO); 26280eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 26380eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 26480eb8761SMike Christie "data areas."); 2657c9e7a6fSAndy Grover 266bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 267bdaeedc1SMike Christie const struct kernel_param *kp) 268bdaeedc1SMike Christie { 269bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 270bdaeedc1SMike Christie "blocked" : "unblocked"); 271bdaeedc1SMike Christie } 272bdaeedc1SMike Christie 273bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 274bdaeedc1SMike Christie const struct kernel_param *kp) 275bdaeedc1SMike Christie { 276bdaeedc1SMike Christie int ret; 277bdaeedc1SMike Christie u8 val; 278bdaeedc1SMike Christie 279bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 280bdaeedc1SMike Christie if (ret < 0) 281bdaeedc1SMike Christie return ret; 282bdaeedc1SMike Christie 283bdaeedc1SMike Christie if (val > 1) { 284bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 285bdaeedc1SMike Christie return -EINVAL; 286bdaeedc1SMike Christie } 287bdaeedc1SMike Christie 288bdaeedc1SMike Christie tcmu_netlink_blocked = val; 289bdaeedc1SMike Christie return 0; 290bdaeedc1SMike Christie } 291bdaeedc1SMike Christie 292bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 293bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 294bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 295bdaeedc1SMike Christie }; 296bdaeedc1SMike Christie 297bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 298bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 299bdaeedc1SMike Christie 300bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 301bdaeedc1SMike Christie { 302bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 303bdaeedc1SMike Christie 304bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 305bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 306bdaeedc1SMike Christie return -EBUSY; 307bdaeedc1SMike Christie } 308bdaeedc1SMike Christie 309bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 310bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 311bdaeedc1SMike Christie nl_cmd->status = -EINTR; 312bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 313bdaeedc1SMike Christie complete(&nl_cmd->complete); 314bdaeedc1SMike Christie } 315bdaeedc1SMike Christie return 0; 316bdaeedc1SMike Christie } 317bdaeedc1SMike Christie 318bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 319bdaeedc1SMike Christie const struct kernel_param *kp) 320bdaeedc1SMike Christie { 321bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 322bdaeedc1SMike Christie int ret; 323bdaeedc1SMike Christie u8 val; 324bdaeedc1SMike Christie 325bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 326bdaeedc1SMike Christie if (ret < 0) 327bdaeedc1SMike Christie return ret; 328bdaeedc1SMike Christie 329bdaeedc1SMike Christie if (val != 1) { 330bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 331bdaeedc1SMike Christie return -EINVAL; 332bdaeedc1SMike Christie } 333bdaeedc1SMike Christie 334bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 335bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 336bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 337bdaeedc1SMike Christie if (ret) 338bdaeedc1SMike Christie break; 339bdaeedc1SMike Christie } 340bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 341bdaeedc1SMike Christie 342bdaeedc1SMike Christie return ret; 343bdaeedc1SMike Christie } 344bdaeedc1SMike Christie 345bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 346bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 347bdaeedc1SMike Christie }; 348bdaeedc1SMike Christie 349bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 350bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 351bdaeedc1SMike Christie 3527c9e7a6fSAndy Grover /* multicast group */ 3537c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3547c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3557c9e7a6fSAndy Grover }; 3567c9e7a6fSAndy Grover 3577c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3587c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3597c9e7a6fSAndy Grover }; 3607c9e7a6fSAndy Grover 361b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 362b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 363b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 364b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 365b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 366b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 367b3af66e2SMike Christie }; 368b3af66e2SMike Christie 369b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 370b3af66e2SMike Christie { 3713228691fSMike Christie struct tcmu_dev *udev = NULL; 372b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 373b3af66e2SMike Christie int dev_id, rc, ret = 0; 374b3af66e2SMike Christie 375b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 376b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 377b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 378b3af66e2SMike Christie return -EINVAL; 379b3af66e2SMike Christie } 380b3af66e2SMike Christie 381b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 382b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 383b3af66e2SMike Christie 3843228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3853228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3863228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3873228691fSMike Christie udev = nl_cmd->udev; 3883228691fSMike Christie break; 389b3af66e2SMike Christie } 3903228691fSMike Christie } 391b3af66e2SMike Christie 3923228691fSMike Christie if (!udev) { 3930c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3943228691fSMike Christie completed_cmd, rc, dev_id); 3953228691fSMike Christie ret = -ENODEV; 3963228691fSMike Christie goto unlock; 3973228691fSMike Christie } 3983228691fSMike Christie list_del(&nl_cmd->nl_list); 399b3af66e2SMike Christie 400bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 401bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 402bdaeedc1SMike Christie nl_cmd->status); 403b3af66e2SMike Christie 404b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 4053228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 4063228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 407b3af66e2SMike Christie ret = -EINVAL; 4083228691fSMike Christie goto unlock; 409b3af66e2SMike Christie } 410b3af66e2SMike Christie 4113228691fSMike Christie nl_cmd->status = rc; 412b3af66e2SMike Christie complete(&nl_cmd->complete); 4133228691fSMike Christie unlock: 4143228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 415b3af66e2SMike Christie return ret; 416b3af66e2SMike Christie } 417b3af66e2SMike Christie 418b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 419b3af66e2SMike Christie { 420b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 421b3af66e2SMike Christie } 422b3af66e2SMike Christie 423b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 424b3af66e2SMike Christie { 425b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 426b3af66e2SMike Christie } 427b3af66e2SMike Christie 428b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 429b3af66e2SMike Christie struct genl_info *info) 430b3af66e2SMike Christie { 431b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 432b3af66e2SMike Christie } 433b3af66e2SMike Christie 434b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 435b3af66e2SMike Christie { 436b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 437b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 438b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 439b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 440b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 441b3af66e2SMike Christie } 442b3af66e2SMike Christie 443b3af66e2SMike Christie return 0; 444b3af66e2SMike Christie } 445b3af66e2SMike Christie 44666a9b928SJakub Kicinski static const struct genl_small_ops tcmu_genl_ops[] = { 447b3af66e2SMike Christie { 448b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 449ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 450b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 451b3af66e2SMike Christie .doit = tcmu_genl_set_features, 452b3af66e2SMike Christie }, 453b3af66e2SMike Christie { 454b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 455ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 456b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 457b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 458b3af66e2SMike Christie }, 459b3af66e2SMike Christie { 460b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 461ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 462b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 463b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 464b3af66e2SMike Christie }, 465b3af66e2SMike Christie { 466b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 467ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 468b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 469b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 470b3af66e2SMike Christie }, 471b3af66e2SMike Christie }; 472b3af66e2SMike Christie 4737c9e7a6fSAndy Grover /* Our generic netlink family */ 47456989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 475489111e5SJohannes Berg .module = THIS_MODULE, 4767c9e7a6fSAndy Grover .hdrsize = 0, 4777c9e7a6fSAndy Grover .name = "TCM-USER", 478b3af66e2SMike Christie .version = 2, 4797c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4803b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4817c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4827c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 48320c08b36SSheng Yang .netnsok = true, 48466a9b928SJakub Kicinski .small_ops = tcmu_genl_ops, 48566a9b928SJakub Kicinski .n_small_ops = ARRAY_SIZE(tcmu_genl_ops), 4867c9e7a6fSAndy Grover }; 4877c9e7a6fSAndy Grover 488141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 489141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 490141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 491141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 492141685a3SXiubo Li 493b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 494141685a3SXiubo Li { 495141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 496141685a3SXiubo Li uint32_t i; 497141685a3SXiubo Li 498b6df4b79SXiubo Li for (i = 0; i < len; i++) 499141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 500141685a3SXiubo Li } 501141685a3SXiubo Li 5027e98905eSBodo Stroesser static inline int tcmu_get_empty_block(struct tcmu_dev *udev, 5037e98905eSBodo Stroesser struct tcmu_cmd *tcmu_cmd, 5047e98905eSBodo Stroesser int prev_dbi, int *iov_cnt) 505141685a3SXiubo Li { 506b6df4b79SXiubo Li struct page *page; 507f7c89771SBodo Stroesser int dbi; 508141685a3SXiubo Li 509b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 510b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 5117e98905eSBodo Stroesser return -1; 512b6df4b79SXiubo Li 513f7c89771SBodo Stroesser page = xa_load(&udev->data_blocks, dbi); 514b6df4b79SXiubo Li if (!page) { 515b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 51680eb8761SMike Christie tcmu_global_max_blocks) 517af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 518b6df4b79SXiubo Li 519b6df4b79SXiubo Li /* try to get new page from the mm */ 5200eccce86SDamien Le Moal page = alloc_page(GFP_NOIO); 521b6df4b79SXiubo Li if (!page) 522daf78c30SXiubo Li goto err_alloc; 523b6df4b79SXiubo Li 5241080782fSBodo Stroesser if (xa_store(&udev->data_blocks, dbi, page, GFP_NOIO)) 525daf78c30SXiubo Li goto err_insert; 526b6df4b79SXiubo Li } 527b6df4b79SXiubo Li 528141685a3SXiubo Li if (dbi > udev->dbi_max) 529141685a3SXiubo Li udev->dbi_max = dbi; 530141685a3SXiubo Li 531141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 532b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 533141685a3SXiubo Li 5347e98905eSBodo Stroesser if (dbi != prev_dbi + 1) 5357e98905eSBodo Stroesser *iov_cnt += 1; 5367e98905eSBodo Stroesser 5377e98905eSBodo Stroesser return dbi; 538daf78c30SXiubo Li err_insert: 539daf78c30SXiubo Li __free_page(page); 540daf78c30SXiubo Li err_alloc: 541daf78c30SXiubo Li atomic_dec(&global_db_count); 5427e98905eSBodo Stroesser return -1; 543141685a3SXiubo Li } 544141685a3SXiubo Li 5457e98905eSBodo Stroesser static int tcmu_get_empty_blocks(struct tcmu_dev *udev, 5467e98905eSBodo Stroesser struct tcmu_cmd *tcmu_cmd, int dbi_cnt) 547b6df4b79SXiubo Li { 5487e98905eSBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 5497e98905eSBodo Stroesser int dbi = -2; 5507e98905eSBodo Stroesser int i, iov_cnt = 0; 551b6df4b79SXiubo Li 5527e98905eSBodo Stroesser for (i = 0; i < dbi_cnt; i++) { 5537e98905eSBodo Stroesser dbi = tcmu_get_empty_block(udev, tcmu_cmd, dbi, &iov_cnt); 5547e98905eSBodo Stroesser if (dbi < 0) 5557e98905eSBodo Stroesser return -1; 556141685a3SXiubo Li } 5577e98905eSBodo Stroesser return iov_cnt; 558141685a3SXiubo Li } 559141685a3SXiubo Li 560b6df4b79SXiubo Li static inline struct page * 561b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 562141685a3SXiubo Li { 563f7c89771SBodo Stroesser return xa_load(&udev->data_blocks, dbi); 564141685a3SXiubo Li } 565141685a3SXiubo Li 566141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 567141685a3SXiubo Li { 568141685a3SXiubo Li kfree(tcmu_cmd->dbi); 569141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 570141685a3SXiubo Li } 571141685a3SXiubo Li 57252ef2743SBodo Stroesser static inline void tcmu_cmd_set_block_cnts(struct tcmu_cmd *cmd) 573141685a3SXiubo Li { 57452ef2743SBodo Stroesser int i, len; 57552ef2743SBodo Stroesser struct se_cmd *se_cmd = cmd->se_cmd; 57652ef2743SBodo Stroesser 57752ef2743SBodo Stroesser cmd->dbi_cnt = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 578141685a3SXiubo Li 579141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 580141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 58152ef2743SBodo Stroesser for (i = 0, len = 0; i < se_cmd->t_bidi_data_nents; i++) 58252ef2743SBodo Stroesser len += se_cmd->t_bidi_data_sg[i].length; 58352ef2743SBodo Stroesser cmd->dbi_bidi_cnt = DIV_ROUND_UP(len, DATA_BLOCK_SIZE); 58452ef2743SBodo Stroesser cmd->dbi_cnt += cmd->dbi_bidi_cnt; 5853c9a7c58SBodo Stroesser cmd->data_len_bidi = len; 586141685a3SXiubo Li } 587141685a3SXiubo Li } 588141685a3SXiubo Li 5893c9a7c58SBodo Stroesser static int new_block_to_iov(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 590c8ed1ff8SBodo Stroesser struct iovec **iov, int prev_dbi, int len) 5913c9a7c58SBodo Stroesser { 5923c9a7c58SBodo Stroesser /* Get the next dbi */ 5933c9a7c58SBodo Stroesser int dbi = tcmu_cmd_get_dbi(cmd); 5943c9a7c58SBodo Stroesser 595c8ed1ff8SBodo Stroesser /* Do not add more than DATA_BLOCK_SIZE to iov */ 596c8ed1ff8SBodo Stroesser if (len > DATA_BLOCK_SIZE) 597c8ed1ff8SBodo Stroesser len = DATA_BLOCK_SIZE; 598c8ed1ff8SBodo Stroesser 5993c9a7c58SBodo Stroesser /* 6003c9a7c58SBodo Stroesser * The following code will gather and map the blocks to the same iovec 6013c9a7c58SBodo Stroesser * when the blocks are all next to each other. 6023c9a7c58SBodo Stroesser */ 6033c9a7c58SBodo Stroesser if (dbi != prev_dbi + 1) { 6043c9a7c58SBodo Stroesser /* dbi is not next to previous dbi, so start new iov */ 6053c9a7c58SBodo Stroesser if (prev_dbi >= 0) 6063c9a7c58SBodo Stroesser (*iov)++; 6073c9a7c58SBodo Stroesser /* write offset relative to mb_addr */ 6083c9a7c58SBodo Stroesser (*iov)->iov_base = (void __user *) 6093c9a7c58SBodo Stroesser (udev->data_off + dbi * DATA_BLOCK_SIZE); 6103c9a7c58SBodo Stroesser } 6113c9a7c58SBodo Stroesser (*iov)->iov_len += len; 6123c9a7c58SBodo Stroesser 6133c9a7c58SBodo Stroesser return dbi; 6143c9a7c58SBodo Stroesser } 6153c9a7c58SBodo Stroesser 6163c9a7c58SBodo Stroesser static void tcmu_setup_iovs(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 6173c9a7c58SBodo Stroesser struct iovec **iov, int data_length) 6183c9a7c58SBodo Stroesser { 6193c9a7c58SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 6203c9a7c58SBodo Stroesser int dbi = -2; 6213c9a7c58SBodo Stroesser 6223c9a7c58SBodo Stroesser /* We prepare the IOVs for DMA_FROM_DEVICE transfer direction */ 623c8ed1ff8SBodo Stroesser for (; data_length > 0; data_length -= DATA_BLOCK_SIZE) 624c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, cmd, iov, dbi, data_length); 6253c9a7c58SBodo Stroesser } 6263c9a7c58SBodo Stroesser 6277c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 6287c9e7a6fSAndy Grover { 6297c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 6307c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 6317c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 6327c9e7a6fSAndy Grover 6330eccce86SDamien Le Moal tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); 6347c9e7a6fSAndy Grover if (!tcmu_cmd) 6357c9e7a6fSAndy Grover return NULL; 6367c9e7a6fSAndy Grover 637a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 6387c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 6397c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 6407c9e7a6fSAndy Grover 64152ef2743SBodo Stroesser tcmu_cmd_set_block_cnts(tcmu_cmd); 642141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 6430eccce86SDamien Le Moal GFP_NOIO); 644141685a3SXiubo Li if (!tcmu_cmd->dbi) { 645141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 646141685a3SXiubo Li return NULL; 647141685a3SXiubo Li } 648141685a3SXiubo Li 6497c9e7a6fSAndy Grover return tcmu_cmd; 6507c9e7a6fSAndy Grover } 6517c9e7a6fSAndy Grover 6527c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 6537c9e7a6fSAndy Grover { 654b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 65526d2b310Stangwenji void *start = vaddr - offset; 6567c9e7a6fSAndy Grover 6577c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6587c9e7a6fSAndy Grover 6597c9e7a6fSAndy Grover while (size) { 6603145550aSBodo Stroesser flush_dcache_page(vmalloc_to_page(start)); 66126d2b310Stangwenji start += PAGE_SIZE; 6627c9e7a6fSAndy Grover size -= PAGE_SIZE; 6637c9e7a6fSAndy Grover } 6647c9e7a6fSAndy Grover } 6657c9e7a6fSAndy Grover 6667c9e7a6fSAndy Grover /* 6677c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6687c9e7a6fSAndy Grover * we can't use circ_buf.h. 6697c9e7a6fSAndy Grover */ 6707c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6717c9e7a6fSAndy Grover { 6727c9e7a6fSAndy Grover int diff = head - tail; 6737c9e7a6fSAndy Grover 6747c9e7a6fSAndy Grover if (diff >= 0) 6757c9e7a6fSAndy Grover return diff; 6767c9e7a6fSAndy Grover else 6777c9e7a6fSAndy Grover return size + diff; 6787c9e7a6fSAndy Grover } 6797c9e7a6fSAndy Grover 6807c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6817c9e7a6fSAndy Grover { 6827c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6837c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6847c9e7a6fSAndy Grover } 6857c9e7a6fSAndy Grover 6867c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6877c9e7a6fSAndy Grover { 6887c9e7a6fSAndy Grover return size - head; 6897c9e7a6fSAndy Grover } 6907c9e7a6fSAndy Grover 6917c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6927c9e7a6fSAndy Grover 693c8ed1ff8SBodo Stroesser #define TCMU_SG_TO_DATA_AREA 1 694c8ed1ff8SBodo Stroesser #define TCMU_DATA_AREA_TO_SG 2 695c8ed1ff8SBodo Stroesser 696c8ed1ff8SBodo Stroesser static inline void tcmu_copy_data(struct tcmu_dev *udev, 697c8ed1ff8SBodo Stroesser struct tcmu_cmd *tcmu_cmd, uint32_t direction, 698c8ed1ff8SBodo Stroesser struct scatterlist *sg, unsigned int sg_nents, 699c8ed1ff8SBodo Stroesser struct iovec **iov, size_t data_len) 700c8ed1ff8SBodo Stroesser { 701c8ed1ff8SBodo Stroesser /* start value of dbi + 1 must not be a valid dbi */ 702c8ed1ff8SBodo Stroesser int dbi = -2; 703c8ed1ff8SBodo Stroesser size_t block_remaining, cp_len; 704c8ed1ff8SBodo Stroesser struct sg_mapping_iter sg_iter; 705c8ed1ff8SBodo Stroesser unsigned int sg_flags; 706c8ed1ff8SBodo Stroesser struct page *page; 707c8ed1ff8SBodo Stroesser void *data_page_start, *data_addr; 708c8ed1ff8SBodo Stroesser 709c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 710c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_FROM_SG; 711c8ed1ff8SBodo Stroesser else 712c8ed1ff8SBodo Stroesser sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; 713c8ed1ff8SBodo Stroesser sg_miter_start(&sg_iter, sg, sg_nents, sg_flags); 714c8ed1ff8SBodo Stroesser 715c8ed1ff8SBodo Stroesser while (data_len) { 716c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 717c8ed1ff8SBodo Stroesser dbi = new_block_to_iov(udev, tcmu_cmd, iov, dbi, 718c8ed1ff8SBodo Stroesser data_len); 719c8ed1ff8SBodo Stroesser else 720c8ed1ff8SBodo Stroesser dbi = tcmu_cmd_get_dbi(tcmu_cmd); 721c8ed1ff8SBodo Stroesser page = tcmu_get_block_page(udev, dbi); 722c8ed1ff8SBodo Stroesser if (direction == TCMU_DATA_AREA_TO_SG) 723c8ed1ff8SBodo Stroesser flush_dcache_page(page); 724c8ed1ff8SBodo Stroesser data_page_start = kmap_atomic(page); 725c8ed1ff8SBodo Stroesser block_remaining = DATA_BLOCK_SIZE; 726c8ed1ff8SBodo Stroesser 727c8ed1ff8SBodo Stroesser while (block_remaining && data_len) { 728c8ed1ff8SBodo Stroesser if (!sg_miter_next(&sg_iter)) { 729c8ed1ff8SBodo Stroesser /* set length to 0 to abort outer loop */ 730c8ed1ff8SBodo Stroesser data_len = 0; 731c8ed1ff8SBodo Stroesser pr_debug("tcmu_move_data: aborting data copy due to exhausted sg_list\n"); 732c8ed1ff8SBodo Stroesser break; 733c8ed1ff8SBodo Stroesser } 734c8ed1ff8SBodo Stroesser cp_len = min3(sg_iter.length, block_remaining, data_len); 735c8ed1ff8SBodo Stroesser 736c8ed1ff8SBodo Stroesser data_addr = data_page_start + 737c8ed1ff8SBodo Stroesser DATA_BLOCK_SIZE - block_remaining; 738c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 739c8ed1ff8SBodo Stroesser memcpy(data_addr, sg_iter.addr, cp_len); 740c8ed1ff8SBodo Stroesser else 741c8ed1ff8SBodo Stroesser memcpy(sg_iter.addr, data_addr, cp_len); 742c8ed1ff8SBodo Stroesser 743c8ed1ff8SBodo Stroesser data_len -= cp_len; 744c8ed1ff8SBodo Stroesser block_remaining -= cp_len; 745c8ed1ff8SBodo Stroesser sg_iter.consumed = cp_len; 746c8ed1ff8SBodo Stroesser } 747c8ed1ff8SBodo Stroesser sg_miter_stop(&sg_iter); 748c8ed1ff8SBodo Stroesser 749c8ed1ff8SBodo Stroesser kunmap_atomic(data_page_start); 750c8ed1ff8SBodo Stroesser if (direction == TCMU_SG_TO_DATA_AREA) 751c8ed1ff8SBodo Stroesser flush_dcache_page(page); 752c8ed1ff8SBodo Stroesser } 753c8ed1ff8SBodo Stroesser } 754c8ed1ff8SBodo Stroesser 7553c9a7c58SBodo Stroesser static void scatter_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7563c9a7c58SBodo Stroesser struct iovec **iov) 75726418649SSheng Yang { 7583c9a7c58SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 759f97ec7dbSIlias Tsitsimpis 760c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_SG_TO_DATA_AREA, se_cmd->t_data_sg, 761c8ed1ff8SBodo Stroesser se_cmd->t_data_nents, iov, se_cmd->data_length); 7623c58f737SBodo Stroesser } 763b6df4b79SXiubo Li 764c8ed1ff8SBodo Stroesser static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, 7656c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 766f97ec7dbSIlias Tsitsimpis { 767c8ed1ff8SBodo Stroesser struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 768c8ed1ff8SBodo Stroesser struct scatterlist *data_sg; 769a5d68ba8SXiubo Li unsigned int data_nents; 770a5d68ba8SXiubo Li 771a5d68ba8SXiubo Li if (!bidi) { 772a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 773a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 774a5d68ba8SXiubo Li } else { 775a5d68ba8SXiubo Li /* 776a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 777a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 77852ef2743SBodo Stroesser * the Data-Out buffer blocks should be skipped. 779a5d68ba8SXiubo Li */ 780c8ed1ff8SBodo Stroesser tcmu_cmd_set_dbi_cur(tcmu_cmd, 781c8ed1ff8SBodo Stroesser tcmu_cmd->dbi_cnt - tcmu_cmd->dbi_bidi_cnt); 782a5d68ba8SXiubo Li 783a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 784a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 785a5d68ba8SXiubo Li } 786f97ec7dbSIlias Tsitsimpis 787c8ed1ff8SBodo Stroesser tcmu_copy_data(udev, tcmu_cmd, TCMU_DATA_AREA_TO_SG, data_sg, 788c8ed1ff8SBodo Stroesser data_nents, NULL, read_len); 789f97ec7dbSIlias Tsitsimpis } 790f97ec7dbSIlias Tsitsimpis 791b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 79226418649SSheng Yang { 7933c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 79426418649SSheng Yang } 79526418649SSheng Yang 7967c9e7a6fSAndy Grover /* 7977e98905eSBodo Stroesser * We can't queue a command until we have space available on the cmd ring. 7987c9e7a6fSAndy Grover * 7997c9e7a6fSAndy Grover * Called with ring lock held. 8007c9e7a6fSAndy Grover */ 8017e98905eSBodo Stroesser static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size) 8027c9e7a6fSAndy Grover { 8037c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 8040241fd39SNicholas Bellinger size_t space, cmd_needed; 8057c9e7a6fSAndy Grover u32 cmd_head; 8067c9e7a6fSAndy Grover 8077c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8087c9e7a6fSAndy Grover 8097c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8107c9e7a6fSAndy Grover 811f56574a2SAndy Grover /* 812f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 813f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 814f56574a2SAndy Grover */ 815f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 816f56574a2SAndy Grover cmd_needed = cmd_size; 817f56574a2SAndy Grover else 818f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 819f56574a2SAndy Grover 8207c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8217c9e7a6fSAndy Grover if (space < cmd_needed) { 8227c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8237c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8247c9e7a6fSAndy Grover return false; 8257c9e7a6fSAndy Grover } 826bc2d214aSBodo Stroesser return true; 8277e98905eSBodo Stroesser } 8287e98905eSBodo Stroesser 8297e98905eSBodo Stroesser /* 8307e98905eSBodo Stroesser * We have to allocate data buffers before we can queue a command. 8317e98905eSBodo Stroesser * Returns -1 on error (not enough space) or number of needed iovs on success 8327e98905eSBodo Stroesser * 8337e98905eSBodo Stroesser * Called with ring lock held. 8347e98905eSBodo Stroesser */ 8357e98905eSBodo Stroesser static int tcmu_alloc_data_space(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 8367e98905eSBodo Stroesser int *iov_bidi_cnt) 8377e98905eSBodo Stroesser { 8387e98905eSBodo Stroesser int space, iov_cnt = 0, ret = 0; 8397e98905eSBodo Stroesser 8407e98905eSBodo Stroesser if (!cmd->dbi_cnt) 8417e98905eSBodo Stroesser goto wr_iov_cnts; 842bc2d214aSBodo Stroesser 843b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 844b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 84552ef2743SBodo Stroesser if (space < cmd->dbi_cnt) { 84680eb8761SMike Christie unsigned long blocks_left = 84780eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 848b6df4b79SXiubo Li 84952ef2743SBodo Stroesser if (blocks_left < cmd->dbi_cnt) { 8507e98905eSBodo Stroesser pr_debug("no data space: only %lu available, but ask for %lu\n", 851b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 85252ef2743SBodo Stroesser cmd->dbi_cnt * DATA_BLOCK_SIZE); 8537e98905eSBodo Stroesser return -1; 8547c9e7a6fSAndy Grover } 8557c9e7a6fSAndy Grover 85652ef2743SBodo Stroesser udev->dbi_thresh += cmd->dbi_cnt; 85780eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 85880eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 859b6df4b79SXiubo Li } 860b6df4b79SXiubo Li 8617e98905eSBodo Stroesser iov_cnt = tcmu_get_empty_blocks(udev, cmd, 8627e98905eSBodo Stroesser cmd->dbi_cnt - cmd->dbi_bidi_cnt); 8637e98905eSBodo Stroesser if (iov_cnt < 0) 8647e98905eSBodo Stroesser return -1; 8657e98905eSBodo Stroesser 8667e98905eSBodo Stroesser if (cmd->dbi_bidi_cnt) { 8677e98905eSBodo Stroesser ret = tcmu_get_empty_blocks(udev, cmd, cmd->dbi_bidi_cnt); 8687e98905eSBodo Stroesser if (ret < 0) 8697e98905eSBodo Stroesser return -1; 8707e98905eSBodo Stroesser } 8717e98905eSBodo Stroesser wr_iov_cnts: 8727e98905eSBodo Stroesser *iov_bidi_cnt = ret; 8737e98905eSBodo Stroesser return iov_cnt + ret; 8747c9e7a6fSAndy Grover } 8757c9e7a6fSAndy Grover 876fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 877fe25cc34SXiubo Li { 878fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 879fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 880fe25cc34SXiubo Li } 881fe25cc34SXiubo Li 882fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 883fe25cc34SXiubo Li size_t base_command_size) 884fe25cc34SXiubo Li { 885fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 886fe25cc34SXiubo Li size_t command_size; 887fe25cc34SXiubo Li 888fe25cc34SXiubo Li command_size = base_command_size + 889fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 890fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 891fe25cc34SXiubo Li 892fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 893fe25cc34SXiubo Li 894fe25cc34SXiubo Li return command_size; 895fe25cc34SXiubo Li } 896fe25cc34SXiubo Li 89761fb2482SBodo Stroesser static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8989103575aSMike Christie struct timer_list *timer) 8990d44374cSMike Christie { 9009103575aSMike Christie if (!tmo) 90161fb2482SBodo Stroesser return; 9029103575aSMike Christie 9030d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 904a94a2572SXiubo Li if (!timer_pending(timer)) 9059103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 906a94a2572SXiubo Li 90761fb2482SBodo Stroesser pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, 90861fb2482SBodo Stroesser tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); 9090d44374cSMike Christie } 9100d44374cSMike Christie 911a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 912af1dd7ffSMike Christie { 913af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9149103575aSMike Christie unsigned int tmo; 915af1dd7ffSMike Christie 9169103575aSMike Christie /* 9179103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9189103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9199103575aSMike Christie */ 9209103575aSMike Christie if (!udev->qfull_time_out) 9219103575aSMike Christie return -ETIMEDOUT; 9229103575aSMike Christie else if (udev->qfull_time_out > 0) 9239103575aSMike Christie tmo = udev->qfull_time_out; 9249103575aSMike Christie else if (udev->cmd_time_out) 9259103575aSMike Christie tmo = udev->cmd_time_out; 9269103575aSMike Christie else 9279103575aSMike Christie tmo = TCMU_TIME_OUT; 9289103575aSMike Christie 92961fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 930af1dd7ffSMike Christie 931a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 93261fb2482SBodo Stroesser pr_debug("adding cmd %p on dev %s to ring space wait queue\n", 93361fb2482SBodo Stroesser tcmu_cmd, udev->name); 934af1dd7ffSMike Christie return 0; 935af1dd7ffSMike Christie } 936af1dd7ffSMike Christie 9373d3f9d56SBodo Stroesser static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) 9383d3f9d56SBodo Stroesser { 9393d3f9d56SBodo Stroesser struct tcmu_cmd_entry_hdr *hdr; 9403d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 9413d3f9d56SBodo Stroesser uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9423d3f9d56SBodo Stroesser 9433d3f9d56SBodo Stroesser /* Insert a PAD if end-of-ring space is too small */ 9443d3f9d56SBodo Stroesser if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { 9453d3f9d56SBodo Stroesser size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 9463d3f9d56SBodo Stroesser 947*ecddbb7eSBodo Stroesser hdr = udev->cmdr + cmd_head; 9483d3f9d56SBodo Stroesser tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); 9493d3f9d56SBodo Stroesser tcmu_hdr_set_len(&hdr->len_op, pad_size); 9503d3f9d56SBodo Stroesser hdr->cmd_id = 0; /* not used for PAD */ 9513d3f9d56SBodo Stroesser hdr->kflags = 0; 9523d3f9d56SBodo Stroesser hdr->uflags = 0; 9533d3f9d56SBodo Stroesser tcmu_flush_dcache_range(hdr, sizeof(*hdr)); 9543d3f9d56SBodo Stroesser 9553d3f9d56SBodo Stroesser UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 9563d3f9d56SBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 9573d3f9d56SBodo Stroesser 9583d3f9d56SBodo Stroesser cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9593d3f9d56SBodo Stroesser WARN_ON(cmd_head != 0); 9603d3f9d56SBodo Stroesser } 9613d3f9d56SBodo Stroesser 9623d3f9d56SBodo Stroesser return cmd_head; 9633d3f9d56SBodo Stroesser } 9643d3f9d56SBodo Stroesser 9656888da81SMike Christie static void tcmu_unplug_device(struct se_dev_plug *se_plug) 9666888da81SMike Christie { 9676888da81SMike Christie struct se_device *se_dev = se_plug->se_dev; 9686888da81SMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 9696888da81SMike Christie 9706888da81SMike Christie clear_bit(TCM_DEV_BIT_PLUGGED, &udev->flags); 9716888da81SMike Christie uio_event_notify(&udev->uio_info); 9726888da81SMike Christie } 9736888da81SMike Christie 9746888da81SMike Christie static struct se_dev_plug *tcmu_plug_device(struct se_device *se_dev) 9756888da81SMike Christie { 9766888da81SMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 9776888da81SMike Christie 9786888da81SMike Christie if (!test_and_set_bit(TCM_DEV_BIT_PLUGGED, &udev->flags)) 9796888da81SMike Christie return &udev->se_plug; 9806888da81SMike Christie 9816888da81SMike Christie return NULL; 9826888da81SMike Christie } 9836888da81SMike Christie 9846fd0ce79SMike Christie /** 9856fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9866fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9876fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9886fd0ce79SMike Christie * 9896fd0ce79SMike Christie * Returns: 9906fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9916fd0ce79SMike Christie * 0 success 992af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9936fd0ce79SMike Christie */ 994e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9957c9e7a6fSAndy Grover { 9967c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9977c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9987c9e7a6fSAndy Grover size_t base_command_size, command_size; 9993d3f9d56SBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 10007c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 10017c9e7a6fSAndy Grover struct iovec *iov; 1002d3cbb743SBodo Stroesser int iov_cnt, iov_bidi_cnt; 1003d3cbb743SBodo Stroesser uint32_t cmd_id, cmd_head; 10047c9e7a6fSAndy Grover uint64_t cdb_off; 100552ef2743SBodo Stroesser /* size of data buffer needed */ 100652ef2743SBodo Stroesser size_t data_length = (size_t)tcmu_cmd->dbi_cnt * DATA_BLOCK_SIZE; 10077c9e7a6fSAndy Grover 10086fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 10096fd0ce79SMike Christie 1010892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 1011892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 1012892782caSMike Christie return -1; 1013892782caSMike Christie } 1014892782caSMike Christie 10156fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 10166fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10176fd0ce79SMike Christie return -1; 10186fd0ce79SMike Christie } 10197c9e7a6fSAndy Grover 1020a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 1021af1dd7ffSMike Christie goto queue; 10227c9e7a6fSAndy Grover 10237e98905eSBodo Stroesser if (data_length > udev->data_size) { 10247e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %zu data area\n", 10257e98905eSBodo Stroesser data_length, udev->data_size); 10266fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 10276fd0ce79SMike Christie return -1; 1028554617b2SAndy Grover } 10297c9e7a6fSAndy Grover 10307e98905eSBodo Stroesser iov_cnt = tcmu_alloc_data_space(udev, tcmu_cmd, &iov_bidi_cnt); 10317e98905eSBodo Stroesser if (iov_cnt < 0) 10327e98905eSBodo Stroesser goto free_and_queue; 10337e98905eSBodo Stroesser 10347e98905eSBodo Stroesser /* 10357e98905eSBodo Stroesser * Must be a certain minimum size for response sense info, but 10367e98905eSBodo Stroesser * also may be larger if the iov array is large. 10377e98905eSBodo Stroesser */ 10387e98905eSBodo Stroesser base_command_size = tcmu_cmd_get_base_cmd_size(iov_cnt); 10397e98905eSBodo Stroesser command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 10407e98905eSBodo Stroesser 10417e98905eSBodo Stroesser if (command_size > (udev->cmdr_size / 2)) { 10427e98905eSBodo Stroesser pr_warn("TCMU: Request of size %zu is too big for %u cmd ring\n", 10437e98905eSBodo Stroesser command_size, udev->cmdr_size); 10447e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 10457e98905eSBodo Stroesser *scsi_err = TCM_INVALID_CDB_FIELD; 10467e98905eSBodo Stroesser return -1; 10477e98905eSBodo Stroesser } 10487e98905eSBodo Stroesser 10497e98905eSBodo Stroesser if (!is_ring_space_avail(udev, command_size)) 1050810b8153SMike Christie /* 1051810b8153SMike Christie * Don't leave commands partially setup because the unmap 1052810b8153SMike Christie * thread might need the blocks to make forward progress. 1053810b8153SMike Christie */ 10547e98905eSBodo Stroesser goto free_and_queue; 105526418649SSheng Yang 1056d3cbb743SBodo Stroesser if (xa_alloc(&udev->commands, &cmd_id, tcmu_cmd, XA_LIMIT(1, 0xffff), 1057d3cbb743SBodo Stroesser GFP_NOWAIT) < 0) { 105861fb2482SBodo Stroesser pr_err("tcmu: Could not allocate cmd id.\n"); 10596fd0ce79SMike Christie 106061fb2482SBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10616fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10626fd0ce79SMike Christie return -1; 10630d44374cSMike Christie } 106461fb2482SBodo Stroesser tcmu_cmd->cmd_id = cmd_id; 106561fb2482SBodo Stroesser 106661fb2482SBodo Stroesser pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, 106761fb2482SBodo Stroesser tcmu_cmd, udev->name); 106861fb2482SBodo Stroesser 10697e98905eSBodo Stroesser cmd_head = ring_insert_padding(udev, command_size); 10707e98905eSBodo Stroesser 1071*ecddbb7eSBodo Stroesser entry = udev->cmdr + cmd_head; 10727e98905eSBodo Stroesser memset(entry, 0, command_size); 10737e98905eSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10747e98905eSBodo Stroesser 10757e98905eSBodo Stroesser /* prepare iov list and copy data to data area if necessary */ 10767e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10777e98905eSBodo Stroesser iov = &entry->req.iov[0]; 10783c9a7c58SBodo Stroesser 10793c9a7c58SBodo Stroesser if (se_cmd->data_direction == DMA_TO_DEVICE || 10803c9a7c58SBodo Stroesser se_cmd->se_cmd_flags & SCF_BIDI) 10813c9a7c58SBodo Stroesser scatter_data_area(udev, tcmu_cmd, &iov); 10823c9a7c58SBodo Stroesser else 10833c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, se_cmd->data_length); 10843c9a7c58SBodo Stroesser 10857e98905eSBodo Stroesser entry->req.iov_cnt = iov_cnt - iov_bidi_cnt; 10867e98905eSBodo Stroesser 10877e98905eSBodo Stroesser /* Handle BIDI commands */ 10887e98905eSBodo Stroesser if (se_cmd->se_cmd_flags & SCF_BIDI) { 10897e98905eSBodo Stroesser iov++; 10903c9a7c58SBodo Stroesser tcmu_setup_iovs(udev, tcmu_cmd, &iov, tcmu_cmd->data_len_bidi); 10917e98905eSBodo Stroesser entry->req.iov_bidi_cnt = iov_bidi_cnt; 10927e98905eSBodo Stroesser } 10937e98905eSBodo Stroesser 109461fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); 109561fb2482SBodo Stroesser 10960d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10970d44374cSMike Christie 1098fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1099fe25cc34SXiubo Li 11007c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 11017c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 11027c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 11037c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 11048c4e0f21SBodo Stroesser tcmu_flush_dcache_range(entry, command_size); 11057c9e7a6fSAndy Grover 11067c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 11077c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 11087c9e7a6fSAndy Grover 1109a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1110a94a2572SXiubo Li 11116888da81SMike Christie if (!test_bit(TCM_DEV_BIT_PLUGGED, &udev->flags)) 11127c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 11137c9e7a6fSAndy Grover 11146fd0ce79SMike Christie return 0; 1115af1dd7ffSMike Christie 11167e98905eSBodo Stroesser free_and_queue: 11177e98905eSBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 11187e98905eSBodo Stroesser tcmu_cmd_reset_dbi_cur(tcmu_cmd); 11197e98905eSBodo Stroesser 1120af1dd7ffSMike Christie queue: 1121a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1122af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1123af1dd7ffSMike Christie return -1; 1124af1dd7ffSMike Christie } 1125af1dd7ffSMike Christie 1126af1dd7ffSMike Christie return 1; 11277c9e7a6fSAndy Grover } 11287c9e7a6fSAndy Grover 1129bc2d214aSBodo Stroesser /** 1130bc2d214aSBodo Stroesser * queue_tmr_ring - queue tmr info to ring or internally 1131bc2d214aSBodo Stroesser * @udev: related tcmu_dev 1132bc2d214aSBodo Stroesser * @tmr: tcmu_tmr containing tmr info to queue 1133bc2d214aSBodo Stroesser * 1134bc2d214aSBodo Stroesser * Returns: 1135bc2d214aSBodo Stroesser * 0 success 1136bc2d214aSBodo Stroesser * 1 internally queued to wait for ring memory to free. 1137bc2d214aSBodo Stroesser */ 1138bc2d214aSBodo Stroesser static int 1139bc2d214aSBodo Stroesser queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) 1140bc2d214aSBodo Stroesser { 1141bc2d214aSBodo Stroesser struct tcmu_tmr_entry *entry; 1142bc2d214aSBodo Stroesser int cmd_size; 1143bc2d214aSBodo Stroesser int id_list_sz; 1144bc2d214aSBodo Stroesser struct tcmu_mailbox *mb = udev->mb_addr; 1145bc2d214aSBodo Stroesser uint32_t cmd_head; 1146bc2d214aSBodo Stroesser 1147bc2d214aSBodo Stroesser if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 1148bc2d214aSBodo Stroesser goto out_free; 1149bc2d214aSBodo Stroesser 1150bc2d214aSBodo Stroesser id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; 1151bc2d214aSBodo Stroesser cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); 1152bc2d214aSBodo Stroesser 1153bc2d214aSBodo Stroesser if (!list_empty(&udev->tmr_queue) || 11547e98905eSBodo Stroesser !is_ring_space_avail(udev, cmd_size)) { 1155bc2d214aSBodo Stroesser list_add_tail(&tmr->queue_entry, &udev->tmr_queue); 1156bc2d214aSBodo Stroesser pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", 1157bc2d214aSBodo Stroesser tmr, udev->name); 1158bc2d214aSBodo Stroesser return 1; 1159bc2d214aSBodo Stroesser } 1160bc2d214aSBodo Stroesser 1161bc2d214aSBodo Stroesser cmd_head = ring_insert_padding(udev, cmd_size); 1162bc2d214aSBodo Stroesser 1163*ecddbb7eSBodo Stroesser entry = udev->cmdr + cmd_head; 1164bc2d214aSBodo Stroesser memset(entry, 0, cmd_size); 1165bc2d214aSBodo Stroesser tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); 1166bc2d214aSBodo Stroesser tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); 1167bc2d214aSBodo Stroesser entry->tmr_type = tmr->tmr_type; 1168bc2d214aSBodo Stroesser entry->cmd_cnt = tmr->tmr_cmd_cnt; 1169bc2d214aSBodo Stroesser memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); 1170bc2d214aSBodo Stroesser tcmu_flush_dcache_range(entry, cmd_size); 1171bc2d214aSBodo Stroesser 1172bc2d214aSBodo Stroesser UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); 1173bc2d214aSBodo Stroesser tcmu_flush_dcache_range(mb, sizeof(*mb)); 1174bc2d214aSBodo Stroesser 1175bc2d214aSBodo Stroesser uio_event_notify(&udev->uio_info); 1176bc2d214aSBodo Stroesser 1177bc2d214aSBodo Stroesser out_free: 1178bc2d214aSBodo Stroesser kfree(tmr); 1179bc2d214aSBodo Stroesser 1180bc2d214aSBodo Stroesser return 0; 1181bc2d214aSBodo Stroesser } 1182bc2d214aSBodo Stroesser 118302eb924fSAndy Grover static sense_reason_t 118402eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11857c9e7a6fSAndy Grover { 1186af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1187af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11887c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1189c9684927SBodo Stroesser sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; 1190c9684927SBodo Stroesser int ret = -1; 11917c9e7a6fSAndy Grover 11927c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11937c9e7a6fSAndy Grover if (!tcmu_cmd) 119402eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11957c9e7a6fSAndy Grover 1196af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1197c9684927SBodo Stroesser if (!(se_cmd->transport_state & CMD_T_ABORTED)) 1198af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1199af1dd7ffSMike Christie if (ret < 0) 1200141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 1201780e1384SShin'ichiro Kawasaki else 1202780e1384SShin'ichiro Kawasaki se_cmd->priv = tcmu_cmd; 1203a3512902SBodo Stroesser mutex_unlock(&udev->cmdr_lock); 12046fd0ce79SMike Christie return scsi_ret; 12057c9e7a6fSAndy Grover } 12067c9e7a6fSAndy Grover 1207ed212ca8SBodo Stroesser static void tcmu_set_next_deadline(struct list_head *queue, 1208ed212ca8SBodo Stroesser struct timer_list *timer) 1209ed212ca8SBodo Stroesser { 1210ed212ca8SBodo Stroesser struct tcmu_cmd *cmd; 1211ed212ca8SBodo Stroesser 1212ed212ca8SBodo Stroesser if (!list_empty(queue)) { 1213ed212ca8SBodo Stroesser cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); 1214ed212ca8SBodo Stroesser mod_timer(timer, cmd->deadline); 1215ed212ca8SBodo Stroesser } else 1216ed212ca8SBodo Stroesser del_timer(timer); 1217ed212ca8SBodo Stroesser } 1218ed212ca8SBodo Stroesser 1219bc2d214aSBodo Stroesser static int 1220bc2d214aSBodo Stroesser tcmu_tmr_type(enum tcm_tmreq_table tmf) 1221bc2d214aSBodo Stroesser { 1222bc2d214aSBodo Stroesser switch (tmf) { 1223bc2d214aSBodo Stroesser case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; 1224bc2d214aSBodo Stroesser case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; 1225bc2d214aSBodo Stroesser case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; 1226bc2d214aSBodo Stroesser case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; 1227bc2d214aSBodo Stroesser case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; 1228bc2d214aSBodo Stroesser case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; 1229bc2d214aSBodo Stroesser case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; 1230bc2d214aSBodo Stroesser case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; 1231bc2d214aSBodo Stroesser default: return TCMU_TMR_UNKNOWN; 1232bc2d214aSBodo Stroesser } 1233bc2d214aSBodo Stroesser } 1234bc2d214aSBodo Stroesser 1235bc2d214aSBodo Stroesser static void 1236bc2d214aSBodo Stroesser tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, 1237bc2d214aSBodo Stroesser struct list_head *cmd_list) 1238bc2d214aSBodo Stroesser { 1239bc2d214aSBodo Stroesser int i = 0, cmd_cnt = 0; 1240bc2d214aSBodo Stroesser bool unqueued = false; 1241bc2d214aSBodo Stroesser uint16_t *cmd_ids = NULL; 1242bc2d214aSBodo Stroesser struct tcmu_cmd *cmd; 1243bc2d214aSBodo Stroesser struct se_cmd *se_cmd; 1244bc2d214aSBodo Stroesser struct tcmu_tmr *tmr; 1245bc2d214aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(se_dev); 1246bc2d214aSBodo Stroesser 1247bc2d214aSBodo Stroesser mutex_lock(&udev->cmdr_lock); 1248bc2d214aSBodo Stroesser 1249bc2d214aSBodo Stroesser /* First we check for aborted commands in qfull_queue */ 1250bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1251bc2d214aSBodo Stroesser i++; 1252bc2d214aSBodo Stroesser if (!se_cmd->priv) 1253bc2d214aSBodo Stroesser continue; 1254bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1255bc2d214aSBodo Stroesser /* Commands on qfull queue have no id yet */ 1256bc2d214aSBodo Stroesser if (cmd->cmd_id) { 1257bc2d214aSBodo Stroesser cmd_cnt++; 1258bc2d214aSBodo Stroesser continue; 1259bc2d214aSBodo Stroesser } 1260bc2d214aSBodo Stroesser pr_debug("Removing aborted command %p from queue on dev %s.\n", 1261bc2d214aSBodo Stroesser cmd, udev->name); 1262bc2d214aSBodo Stroesser 1263bc2d214aSBodo Stroesser list_del_init(&cmd->queue_entry); 1264bc2d214aSBodo Stroesser tcmu_free_cmd(cmd); 1265780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 1266bc2d214aSBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); 1267bc2d214aSBodo Stroesser unqueued = true; 1268bc2d214aSBodo Stroesser } 1269bc2d214aSBodo Stroesser if (unqueued) 1270bc2d214aSBodo Stroesser tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1271bc2d214aSBodo Stroesser 127259526d7aSBodo Stroesser if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) 127359526d7aSBodo Stroesser goto unlock; 127459526d7aSBodo Stroesser 1275bc2d214aSBodo Stroesser pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", 1276bc2d214aSBodo Stroesser tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); 1277bc2d214aSBodo Stroesser 12781080782fSBodo Stroesser tmr = kmalloc(sizeof(*tmr) + cmd_cnt * sizeof(*cmd_ids), GFP_NOIO); 1279bc2d214aSBodo Stroesser if (!tmr) 1280bc2d214aSBodo Stroesser goto unlock; 1281bc2d214aSBodo Stroesser 1282bc2d214aSBodo Stroesser tmr->tmr_type = tcmu_tmr_type(tmf); 1283bc2d214aSBodo Stroesser tmr->tmr_cmd_cnt = cmd_cnt; 1284bc2d214aSBodo Stroesser 1285bc2d214aSBodo Stroesser if (cmd_cnt != 0) { 1286bc2d214aSBodo Stroesser cmd_cnt = 0; 1287bc2d214aSBodo Stroesser list_for_each_entry(se_cmd, cmd_list, state_list) { 1288bc2d214aSBodo Stroesser if (!se_cmd->priv) 1289bc2d214aSBodo Stroesser continue; 1290bc2d214aSBodo Stroesser cmd = se_cmd->priv; 1291bc2d214aSBodo Stroesser if (cmd->cmd_id) 1292bc2d214aSBodo Stroesser tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; 1293bc2d214aSBodo Stroesser } 1294bc2d214aSBodo Stroesser } 1295bc2d214aSBodo Stroesser 1296bc2d214aSBodo Stroesser queue_tmr_ring(udev, tmr); 1297bc2d214aSBodo Stroesser 1298bc2d214aSBodo Stroesser unlock: 1299bc2d214aSBodo Stroesser mutex_unlock(&udev->cmdr_lock); 1300bc2d214aSBodo Stroesser } 1301bc2d214aSBodo Stroesser 13027c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 13037c9e7a6fSAndy Grover { 13047c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 13057c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 13066c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 1307a86a7586SDmitry Fomichev uint32_t read_len; 13087c9e7a6fSAndy Grover 1309b25c7863SSheng Yang /* 1310b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 13113d9b9555SAndy Grover * data area space and free cmd 1312b25c7863SSheng Yang */ 1313a86a7586SDmitry Fomichev if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1314a86a7586SDmitry Fomichev WARN_ON_ONCE(se_cmd); 1315141685a3SXiubo Li goto out; 1316a86a7586SDmitry Fomichev } 1317b25c7863SSheng Yang 1318a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1319a94a2572SXiubo Li 1320141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 13217c9e7a6fSAndy Grover 13220ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 13230ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 13240ad46af8SAndy Grover cmd->se_cmd); 1325ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 13266c3796d1Sbstroesser@ts.fujitsu.com goto done; 13276c3796d1Sbstroesser@ts.fujitsu.com } 13286c3796d1Sbstroesser@ts.fujitsu.com 1329a86a7586SDmitry Fomichev read_len = se_cmd->data_length; 13306c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 13316c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 13326c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 13336c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 13346c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 13356c3796d1Sbstroesser@ts.fujitsu.com } 13366c3796d1Sbstroesser@ts.fujitsu.com 13376c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1338406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 13396c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 13406c3796d1Sbstroesser@ts.fujitsu.com goto done; 13416c3796d1Sbstroesser@ts.fujitsu.com else 13426c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 13436c3796d1Sbstroesser@ts.fujitsu.com } 13446c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 134526418649SSheng Yang /* Get Data-In buffer before clean up */ 13466c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1347e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 13486c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 13497c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1350141685a3SXiubo Li /* TODO: */ 13512bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 13522bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 13532bc396a2SIlias Tsitsimpis se_cmd->data_direction); 13547c9e7a6fSAndy Grover } 13557c9e7a6fSAndy Grover 13566c3796d1Sbstroesser@ts.fujitsu.com done: 1357780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 13586c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 13596c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 13606c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 13616c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 13626c3796d1Sbstroesser@ts.fujitsu.com } else 13637c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 13647c9e7a6fSAndy Grover 1365141685a3SXiubo Li out: 1366b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1367141685a3SXiubo Li tcmu_free_cmd(cmd); 13687c9e7a6fSAndy Grover } 13697c9e7a6fSAndy Grover 1370bc2d214aSBodo Stroesser static int tcmu_run_tmr_queue(struct tcmu_dev *udev) 1371bc2d214aSBodo Stroesser { 1372bc2d214aSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 1373bc2d214aSBodo Stroesser LIST_HEAD(tmrs); 1374bc2d214aSBodo Stroesser 1375bc2d214aSBodo Stroesser if (list_empty(&udev->tmr_queue)) 1376bc2d214aSBodo Stroesser return 1; 1377bc2d214aSBodo Stroesser 1378bc2d214aSBodo Stroesser pr_debug("running %s's tmr queue\n", udev->name); 1379bc2d214aSBodo Stroesser 1380bc2d214aSBodo Stroesser list_splice_init(&udev->tmr_queue, &tmrs); 1381bc2d214aSBodo Stroesser 1382bc2d214aSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { 1383bc2d214aSBodo Stroesser list_del_init(&tmr->queue_entry); 1384bc2d214aSBodo Stroesser 1385bc2d214aSBodo Stroesser pr_debug("removing tmr %p on dev %s from queue\n", 1386bc2d214aSBodo Stroesser tmr, udev->name); 1387bc2d214aSBodo Stroesser 1388bc2d214aSBodo Stroesser if (queue_tmr_ring(udev, tmr)) { 1389bc2d214aSBodo Stroesser pr_debug("ran out of space during tmr queue run\n"); 1390bc2d214aSBodo Stroesser /* 1391bc2d214aSBodo Stroesser * tmr was requeued, so just put all tmrs back in 1392bc2d214aSBodo Stroesser * the queue 1393bc2d214aSBodo Stroesser */ 1394bc2d214aSBodo Stroesser list_splice_tail(&tmrs, &udev->tmr_queue); 1395bc2d214aSBodo Stroesser return 0; 1396bc2d214aSBodo Stroesser } 1397bc2d214aSBodo Stroesser } 1398bc2d214aSBodo Stroesser 1399bc2d214aSBodo Stroesser return 1; 1400bc2d214aSBodo Stroesser } 1401bc2d214aSBodo Stroesser 14027c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 14037c9e7a6fSAndy Grover { 14047c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1405a94a2572SXiubo Li struct tcmu_cmd *cmd; 1406bc2d214aSBodo Stroesser bool free_space = false; 14077c9e7a6fSAndy Grover 14087c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 14097c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 14107c9e7a6fSAndy Grover return 0; 14117c9e7a6fSAndy Grover } 14127c9e7a6fSAndy Grover 14137c9e7a6fSAndy Grover mb = udev->mb_addr; 14147c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 14157c9e7a6fSAndy Grover 14166aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 14177c9e7a6fSAndy Grover 1418*ecddbb7eSBodo Stroesser struct tcmu_cmd_entry *entry = udev->cmdr + udev->cmdr_last_cleaned; 14197c9e7a6fSAndy Grover 14205a0c256dSBodo Stroesser /* 14215a0c256dSBodo Stroesser * Flush max. up to end of cmd ring since current entry might 14225a0c256dSBodo Stroesser * be a padding that is shorter than sizeof(*entry) 14235a0c256dSBodo Stroesser */ 14245a0c256dSBodo Stroesser size_t ring_left = head_to_end(udev->cmdr_last_cleaned, 14255a0c256dSBodo Stroesser udev->cmdr_size); 14265a0c256dSBodo Stroesser tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? 14275a0c256dSBodo Stroesser ring_left : sizeof(*entry)); 14287c9e7a6fSAndy Grover 1429bc2d214aSBodo Stroesser free_space = true; 1430bc2d214aSBodo Stroesser 1431bc2d214aSBodo Stroesser if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || 1432bc2d214aSBodo Stroesser tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { 14330ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14340ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14350ad46af8SAndy Grover udev->cmdr_size); 14367c9e7a6fSAndy Grover continue; 14377c9e7a6fSAndy Grover } 14380ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 14397c9e7a6fSAndy Grover 1440d3cbb743SBodo Stroesser cmd = xa_erase(&udev->commands, entry->hdr.cmd_id); 14417c9e7a6fSAndy Grover if (!cmd) { 144288cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 144388cf1073SMike Christie entry->hdr.cmd_id); 14447c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 14457c9e7a6fSAndy Grover break; 14467c9e7a6fSAndy Grover } 14477c9e7a6fSAndy Grover 14487c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 14497c9e7a6fSAndy Grover 14500ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 14510ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 14520ad46af8SAndy Grover udev->cmdr_size); 14537c9e7a6fSAndy Grover } 1454bc2d214aSBodo Stroesser if (free_space) 1455bc2d214aSBodo Stroesser free_space = tcmu_run_tmr_queue(udev); 14567c9e7a6fSAndy Grover 1457ed212ca8SBodo Stroesser if (atomic_read(&global_db_count) > tcmu_global_max_blocks && 1458d3cbb743SBodo Stroesser xa_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { 1459af1dd7ffSMike Christie /* 1460ed212ca8SBodo Stroesser * Allocated blocks exceeded global block limit, currently no 1461ed212ca8SBodo Stroesser * more pending or waiting commands so try to reclaim blocks. 1462af1dd7ffSMike Christie */ 1463af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1464af1dd7ffSMike Christie } 1465ed212ca8SBodo Stroesser if (udev->cmd_time_out) 1466a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 14677c9e7a6fSAndy Grover 1468bc2d214aSBodo Stroesser return free_space; 14697c9e7a6fSAndy Grover } 14707c9e7a6fSAndy Grover 147161fb2482SBodo Stroesser static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) 14727c9e7a6fSAndy Grover { 1473af1dd7ffSMike Christie struct se_cmd *se_cmd; 14747c9e7a6fSAndy Grover 1475ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 147661fb2482SBodo Stroesser return; 14779103575aSMike Christie 1478af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 147940d883b0SXiubo Li list_del_init(&cmd->queue_entry); 148061fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 1481a3512902SBodo Stroesser se_cmd->priv = NULL; 1482a86a7586SDmitry Fomichev cmd->se_cmd = NULL; 148361fb2482SBodo Stroesser 148461fb2482SBodo Stroesser pr_debug("Timing out inflight cmd %u on dev %s.\n", 148561fb2482SBodo Stroesser cmd->cmd_id, cmd->tcmu_dev->name); 148661fb2482SBodo Stroesser 148761fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); 1488af1dd7ffSMike Christie } 14899103575aSMike Christie 149061fb2482SBodo Stroesser static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) 149161fb2482SBodo Stroesser { 149261fb2482SBodo Stroesser struct se_cmd *se_cmd; 14939103575aSMike Christie 1494ed212ca8SBodo Stroesser if (!time_after_eq(jiffies, cmd->deadline)) 149561fb2482SBodo Stroesser return; 149661fb2482SBodo Stroesser 14979d7464b1SDan Carpenter pr_debug("Timing out queued cmd %p on dev %s.\n", 14989d7464b1SDan Carpenter cmd, cmd->tcmu_dev->name); 14999d7464b1SDan Carpenter 150061fb2482SBodo Stroesser list_del_init(&cmd->queue_entry); 150161fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 150261fb2482SBodo Stroesser tcmu_free_cmd(cmd); 150361fb2482SBodo Stroesser 1504780e1384SShin'ichiro Kawasaki se_cmd->priv = NULL; 150561fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); 15067c9e7a6fSAndy Grover } 15077c9e7a6fSAndy Grover 15089103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 15097c9e7a6fSAndy Grover { 1510488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1511488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1512488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1513488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 15147c9e7a6fSAndy Grover 1515af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 15167c9e7a6fSAndy Grover } 15177c9e7a6fSAndy Grover 15189103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 15199103575aSMike Christie { 15209103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 15219103575aSMike Christie 15229103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 15239103575aSMike Christie tcmu_device_timedout(udev); 15249103575aSMike Christie } 15259103575aSMike Christie 15269103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 15279103575aSMike Christie { 15289103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 15299103575aSMike Christie 15309103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 15319103575aSMike Christie tcmu_device_timedout(udev); 15329103575aSMike Christie } 15339103575aSMike Christie 15347c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 15357c9e7a6fSAndy Grover { 15367c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 15377c9e7a6fSAndy Grover 15387c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 15397c9e7a6fSAndy Grover if (!tcmu_hba) 15407c9e7a6fSAndy Grover return -ENOMEM; 15417c9e7a6fSAndy Grover 15427c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 15437c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 15447c9e7a6fSAndy Grover 15457c9e7a6fSAndy Grover return 0; 15467c9e7a6fSAndy Grover } 15477c9e7a6fSAndy Grover 15487c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 15497c9e7a6fSAndy Grover { 15507c9e7a6fSAndy Grover kfree(hba->hba_ptr); 15517c9e7a6fSAndy Grover hba->hba_ptr = NULL; 15527c9e7a6fSAndy Grover } 15537c9e7a6fSAndy Grover 15547c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 15557c9e7a6fSAndy Grover { 15567c9e7a6fSAndy Grover struct tcmu_dev *udev; 15577c9e7a6fSAndy Grover 15587c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 15597c9e7a6fSAndy Grover if (!udev) 15607c9e7a6fSAndy Grover return NULL; 1561f3cdbe39SMike Christie kref_init(&udev->kref); 15627c9e7a6fSAndy Grover 15637c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 15647c9e7a6fSAndy Grover if (!udev->name) { 15657c9e7a6fSAndy Grover kfree(udev); 15667c9e7a6fSAndy Grover return NULL; 15677c9e7a6fSAndy Grover } 15687c9e7a6fSAndy Grover 15697c9e7a6fSAndy Grover udev->hba = hba; 1570af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 15719103575aSMike Christie udev->qfull_time_out = -1; 15727c9e7a6fSAndy Grover 157380eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1574b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 15757c9e7a6fSAndy Grover 1576ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1577488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1578a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1579bc2d214aSBodo Stroesser INIT_LIST_HEAD(&udev->tmr_queue); 1580a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 1581d3cbb743SBodo Stroesser xa_init_flags(&udev->commands, XA_FLAGS_ALLOC1); 15827c9e7a6fSAndy Grover 15839103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 15849103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 15857c9e7a6fSAndy Grover 1586f7c89771SBodo Stroesser xa_init(&udev->data_blocks); 1587c22adc0bSXiubo Li 15887c9e7a6fSAndy Grover return &udev->se_dev; 15897c9e7a6fSAndy Grover } 15907c9e7a6fSAndy Grover 159143bf922cSBodo Stroesser static void tcmu_dev_call_rcu(struct rcu_head *p) 159243bf922cSBodo Stroesser { 159343bf922cSBodo Stroesser struct se_device *dev = container_of(p, struct se_device, rcu_head); 159443bf922cSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(dev); 159543bf922cSBodo Stroesser 159643bf922cSBodo Stroesser kfree(udev->uio_info.name); 159743bf922cSBodo Stroesser kfree(udev->name); 159843bf922cSBodo Stroesser kfree(udev); 159943bf922cSBodo Stroesser } 160043bf922cSBodo Stroesser 160143bf922cSBodo Stroesser static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 160243bf922cSBodo Stroesser { 160343bf922cSBodo Stroesser if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 160443bf922cSBodo Stroesser kmem_cache_free(tcmu_cmd_cache, cmd); 160543bf922cSBodo Stroesser return 0; 160643bf922cSBodo Stroesser } 160743bf922cSBodo Stroesser return -EINVAL; 160843bf922cSBodo Stroesser } 160943bf922cSBodo Stroesser 1610f7c89771SBodo Stroesser static void tcmu_blocks_release(struct xarray *blocks, unsigned long first, 1611f7c89771SBodo Stroesser unsigned long last) 161243bf922cSBodo Stroesser { 1613f7c89771SBodo Stroesser XA_STATE(xas, blocks, first); 161443bf922cSBodo Stroesser struct page *page; 161543bf922cSBodo Stroesser 1616f7c89771SBodo Stroesser xas_lock(&xas); 1617f7c89771SBodo Stroesser xas_for_each(&xas, page, last) { 1618f7c89771SBodo Stroesser xas_store(&xas, NULL); 161943bf922cSBodo Stroesser __free_page(page); 162043bf922cSBodo Stroesser atomic_dec(&global_db_count); 162143bf922cSBodo Stroesser } 1622f7c89771SBodo Stroesser xas_unlock(&xas); 162343bf922cSBodo Stroesser } 162443bf922cSBodo Stroesser 162543bf922cSBodo Stroesser static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) 162643bf922cSBodo Stroesser { 162743bf922cSBodo Stroesser struct tcmu_tmr *tmr, *tmp; 162843bf922cSBodo Stroesser 162943bf922cSBodo Stroesser list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { 163043bf922cSBodo Stroesser list_del_init(&tmr->queue_entry); 163143bf922cSBodo Stroesser kfree(tmr); 163243bf922cSBodo Stroesser } 163343bf922cSBodo Stroesser } 163443bf922cSBodo Stroesser 163543bf922cSBodo Stroesser static void tcmu_dev_kref_release(struct kref *kref) 163643bf922cSBodo Stroesser { 163743bf922cSBodo Stroesser struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 163843bf922cSBodo Stroesser struct se_device *dev = &udev->se_dev; 163943bf922cSBodo Stroesser struct tcmu_cmd *cmd; 164043bf922cSBodo Stroesser bool all_expired = true; 1641d3cbb743SBodo Stroesser unsigned long i; 164243bf922cSBodo Stroesser 164343bf922cSBodo Stroesser vfree(udev->mb_addr); 164443bf922cSBodo Stroesser udev->mb_addr = NULL; 164543bf922cSBodo Stroesser 164643bf922cSBodo Stroesser spin_lock_bh(&timed_out_udevs_lock); 164743bf922cSBodo Stroesser if (!list_empty(&udev->timedout_entry)) 164843bf922cSBodo Stroesser list_del(&udev->timedout_entry); 164943bf922cSBodo Stroesser spin_unlock_bh(&timed_out_udevs_lock); 165043bf922cSBodo Stroesser 165143bf922cSBodo Stroesser /* Upper layer should drain all requests before calling this */ 165243bf922cSBodo Stroesser mutex_lock(&udev->cmdr_lock); 1653d3cbb743SBodo Stroesser xa_for_each(&udev->commands, i, cmd) { 165443bf922cSBodo Stroesser if (tcmu_check_and_free_pending_cmd(cmd) != 0) 165543bf922cSBodo Stroesser all_expired = false; 165643bf922cSBodo Stroesser } 165743bf922cSBodo Stroesser /* There can be left over TMR cmds. Remove them. */ 165843bf922cSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 165943bf922cSBodo Stroesser if (!list_empty(&udev->qfull_queue)) 166043bf922cSBodo Stroesser all_expired = false; 1661d3cbb743SBodo Stroesser xa_destroy(&udev->commands); 166243bf922cSBodo Stroesser WARN_ON(!all_expired); 166343bf922cSBodo Stroesser 1664471ee95cSBodo Stroesser tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max); 166543bf922cSBodo Stroesser bitmap_free(udev->data_bitmap); 166643bf922cSBodo Stroesser mutex_unlock(&udev->cmdr_lock); 166743bf922cSBodo Stroesser 16688f33bb24SBodo Stroesser pr_debug("dev_kref_release\n"); 16698f33bb24SBodo Stroesser 167043bf922cSBodo Stroesser call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 167143bf922cSBodo Stroesser } 167243bf922cSBodo Stroesser 167361fb2482SBodo Stroesser static void run_qfull_queue(struct tcmu_dev *udev, bool fail) 1674af1dd7ffSMike Christie { 1675af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1676af1dd7ffSMike Christie LIST_HEAD(cmds); 1677af1dd7ffSMike Christie sense_reason_t scsi_ret; 1678af1dd7ffSMike Christie int ret; 1679af1dd7ffSMike Christie 1680a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 168161fb2482SBodo Stroesser return; 1682af1dd7ffSMike Christie 1683892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1684af1dd7ffSMike Christie 1685a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1686af1dd7ffSMike Christie 1687a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1688a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1689af1dd7ffSMike Christie 169061fb2482SBodo Stroesser pr_debug("removing cmd %p on dev %s from queue\n", 169161fb2482SBodo Stroesser tcmu_cmd, udev->name); 1692af1dd7ffSMike Christie 1693892782caSMike Christie if (fail) { 1694892782caSMike Christie /* 1695892782caSMike Christie * We were not able to even start the command, so 1696892782caSMike Christie * fail with busy to allow a retry in case runner 1697892782caSMike Christie * was only temporarily down. If the device is being 1698892782caSMike Christie * removed then LIO core will do the right thing and 1699892782caSMike Christie * fail the retry. 1700892782caSMike Christie */ 1701780e1384SShin'ichiro Kawasaki tcmu_cmd->se_cmd->priv = NULL; 1702892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1703892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1704892782caSMike Christie continue; 1705892782caSMike Christie } 1706892782caSMike Christie 1707af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1708af1dd7ffSMike Christie if (ret < 0) { 170961fb2482SBodo Stroesser pr_debug("cmd %p on dev %s failed with %u\n", 171061fb2482SBodo Stroesser tcmu_cmd, udev->name, scsi_ret); 1711af1dd7ffSMike Christie /* 1712af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1713af1dd7ffSMike Christie * drops it. 1714af1dd7ffSMike Christie */ 1715780e1384SShin'ichiro Kawasaki tcmu_cmd->se_cmd->priv = NULL; 1716af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1717af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1718af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1719af1dd7ffSMike Christie } else if (ret > 0) { 1720af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1721af1dd7ffSMike Christie /* 1722af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1723af1dd7ffSMike Christie * the queue 1724af1dd7ffSMike Christie */ 1725a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1726a94a2572SXiubo Li break; 1727af1dd7ffSMike Christie } 1728af1dd7ffSMike Christie } 1729a94a2572SXiubo Li 1730a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1731af1dd7ffSMike Christie } 1732af1dd7ffSMike Christie 17337c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 17347c9e7a6fSAndy Grover { 1735af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 17367c9e7a6fSAndy Grover 1737af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1738bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 1739a94a2572SXiubo Li run_qfull_queue(udev, false); 1740af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 17417c9e7a6fSAndy Grover 17427c9e7a6fSAndy Grover return 0; 17437c9e7a6fSAndy Grover } 17447c9e7a6fSAndy Grover 17457c9e7a6fSAndy Grover /* 17467c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 17477c9e7a6fSAndy Grover * and this stuff must come along. 17487c9e7a6fSAndy Grover */ 17497c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 17507c9e7a6fSAndy Grover { 17517c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 17527c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 17537c9e7a6fSAndy Grover 17547c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 17557c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 17567c9e7a6fSAndy Grover return -1; 17577c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 17587c9e7a6fSAndy Grover } 17597c9e7a6fSAndy Grover return -1; 17607c9e7a6fSAndy Grover } 17617c9e7a6fSAndy Grover 1762b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1763b6df4b79SXiubo Li { 1764b6df4b79SXiubo Li struct page *page; 1765b6df4b79SXiubo Li 1766b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1767b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1768b6df4b79SXiubo Li if (likely(page)) { 1769b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1770b6df4b79SXiubo Li return page; 1771b6df4b79SXiubo Li } 1772b6df4b79SXiubo Li 1773b6df4b79SXiubo Li /* 1774c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1775c1c390baSMike Christie * data iov passed to it. 1776b6df4b79SXiubo Li */ 1777c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1778c1c390baSMike Christie dbi, udev->name); 1779c1c390baSMike Christie page = NULL; 1780b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1781b6df4b79SXiubo Li 1782b6df4b79SXiubo Li return page; 1783b6df4b79SXiubo Li } 1784b6df4b79SXiubo Li 17858f33bb24SBodo Stroesser static void tcmu_vma_open(struct vm_area_struct *vma) 17868f33bb24SBodo Stroesser { 17878f33bb24SBodo Stroesser struct tcmu_dev *udev = vma->vm_private_data; 17888f33bb24SBodo Stroesser 17898f33bb24SBodo Stroesser pr_debug("vma_open\n"); 17908f33bb24SBodo Stroesser 17918f33bb24SBodo Stroesser kref_get(&udev->kref); 17928f33bb24SBodo Stroesser } 17938f33bb24SBodo Stroesser 17948f33bb24SBodo Stroesser static void tcmu_vma_close(struct vm_area_struct *vma) 17958f33bb24SBodo Stroesser { 17968f33bb24SBodo Stroesser struct tcmu_dev *udev = vma->vm_private_data; 17978f33bb24SBodo Stroesser 17988f33bb24SBodo Stroesser pr_debug("vma_close\n"); 17998f33bb24SBodo Stroesser 18008f33bb24SBodo Stroesser /* release ref from tcmu_vma_open */ 18018f33bb24SBodo Stroesser kref_put(&udev->kref, tcmu_dev_kref_release); 18028f33bb24SBodo Stroesser } 18038f33bb24SBodo Stroesser 180469589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 18057c9e7a6fSAndy Grover { 180611bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 18077c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 18087c9e7a6fSAndy Grover struct page *page; 18097c9e7a6fSAndy Grover unsigned long offset; 18107c9e7a6fSAndy Grover void *addr; 18117c9e7a6fSAndy Grover 181211bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 18137c9e7a6fSAndy Grover if (mi < 0) 18147c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 18157c9e7a6fSAndy Grover 18167c9e7a6fSAndy Grover /* 18177c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 18187c9e7a6fSAndy Grover * to use mem[N]. 18197c9e7a6fSAndy Grover */ 18207c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 18217c9e7a6fSAndy Grover 1822141685a3SXiubo Li if (offset < udev->data_off) { 1823141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 18247c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 18257c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1826141685a3SXiubo Li } else { 1827141685a3SXiubo Li uint32_t dbi; 1828141685a3SXiubo Li 1829b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1830141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1831b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1832b6df4b79SXiubo Li if (!page) 1833c1c390baSMike Christie return VM_FAULT_SIGBUS; 1834141685a3SXiubo Li } 1835141685a3SXiubo Li 18367c9e7a6fSAndy Grover get_page(page); 18377c9e7a6fSAndy Grover vmf->page = page; 18387c9e7a6fSAndy Grover return 0; 18397c9e7a6fSAndy Grover } 18407c9e7a6fSAndy Grover 18417c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 18428f33bb24SBodo Stroesser .open = tcmu_vma_open, 18438f33bb24SBodo Stroesser .close = tcmu_vma_close, 18447c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 18457c9e7a6fSAndy Grover }; 18467c9e7a6fSAndy Grover 18477c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 18487c9e7a6fSAndy Grover { 18497c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18507c9e7a6fSAndy Grover 18517c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 18527c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 18537c9e7a6fSAndy Grover 18547c9e7a6fSAndy Grover vma->vm_private_data = udev; 18557c9e7a6fSAndy Grover 18567c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 1857*ecddbb7eSBodo Stroesser if (vma_pages(vma) != udev->mmap_pages) 18587c9e7a6fSAndy Grover return -EINVAL; 18597c9e7a6fSAndy Grover 18608f33bb24SBodo Stroesser tcmu_vma_open(vma); 18618f33bb24SBodo Stroesser 18627c9e7a6fSAndy Grover return 0; 18637c9e7a6fSAndy Grover } 18647c9e7a6fSAndy Grover 18657c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 18667c9e7a6fSAndy Grover { 18677c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18687c9e7a6fSAndy Grover 18697c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 18707c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 18717c9e7a6fSAndy Grover return -EBUSY; 18727c9e7a6fSAndy Grover 1873b6df4b79SXiubo Li udev->inode = inode; 1874b6df4b79SXiubo Li 18757c9e7a6fSAndy Grover pr_debug("open\n"); 18767c9e7a6fSAndy Grover 18777c9e7a6fSAndy Grover return 0; 18787c9e7a6fSAndy Grover } 18797c9e7a6fSAndy Grover 18807c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 18817c9e7a6fSAndy Grover { 18827c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 18837c9e7a6fSAndy Grover 18847c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 18857c9e7a6fSAndy Grover 18867c9e7a6fSAndy Grover pr_debug("close\n"); 18878f33bb24SBodo Stroesser 18887c9e7a6fSAndy Grover return 0; 18897c9e7a6fSAndy Grover } 18907c9e7a6fSAndy Grover 18919de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1892b3af66e2SMike Christie { 1893b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1894b3af66e2SMike Christie 1895b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 18969de3a1efSMike Christie return 0; 1897b849b456SKenjiro Nakayama 1898b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 18999de3a1efSMike Christie return 0; 1900b849b456SKenjiro Nakayama 19013228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1902b3af66e2SMike Christie 1903bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1904bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1905bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1906bdaeedc1SMike Christie udev->name); 1907bdaeedc1SMike Christie return -EAGAIN; 1908bdaeedc1SMike Christie } 1909b3af66e2SMike Christie 1910b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 19113228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 19129de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 19139de3a1efSMike Christie nl_cmd->cmd, udev->name); 19149de3a1efSMike Christie return -EBUSY; 1915b3af66e2SMike Christie } 1916b3af66e2SMike Christie 1917b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1918b3af66e2SMike Christie nl_cmd->cmd = cmd; 19193228691fSMike Christie nl_cmd->udev = udev; 1920b3af66e2SMike Christie init_completion(&nl_cmd->complete); 19213228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1922b3af66e2SMike Christie 19233228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 19243228691fSMike Christie 19253228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 19269de3a1efSMike Christie return 0; 1927b3af66e2SMike Christie } 1928b3af66e2SMike Christie 19297d894862SLi Zhong static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) 19307d894862SLi Zhong { 19317d894862SLi Zhong struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 19327d894862SLi Zhong 19337d894862SLi Zhong if (!tcmu_kern_cmd_reply_supported) 19347d894862SLi Zhong return; 19357d894862SLi Zhong 19367d894862SLi Zhong if (udev->nl_reply_supported <= 0) 19377d894862SLi Zhong return; 19387d894862SLi Zhong 19397d894862SLi Zhong mutex_lock(&tcmu_nl_cmd_mutex); 19407d894862SLi Zhong 19417d894862SLi Zhong list_del(&nl_cmd->nl_list); 19427d894862SLi Zhong memset(nl_cmd, 0, sizeof(*nl_cmd)); 19437d894862SLi Zhong 19447d894862SLi Zhong mutex_unlock(&tcmu_nl_cmd_mutex); 19457d894862SLi Zhong } 19467d894862SLi Zhong 1947b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1948b3af66e2SMike Christie { 1949b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1950b3af66e2SMike Christie int ret; 1951b3af66e2SMike Christie 1952b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1953b3af66e2SMike Christie return 0; 1954b3af66e2SMike Christie 1955b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1956b849b456SKenjiro Nakayama return 0; 1957b849b456SKenjiro Nakayama 1958b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1959b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1960b3af66e2SMike Christie 19613228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1962b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1963b3af66e2SMike Christie ret = nl_cmd->status; 19643228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1965b3af66e2SMike Christie 196685fae482SLuis de Bethencourt return ret; 1967b3af66e2SMike Christie } 1968b3af66e2SMike Christie 19690e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 19700e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 19710e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 19727c9e7a6fSAndy Grover { 19737c9e7a6fSAndy Grover struct sk_buff *skb; 19747c9e7a6fSAndy Grover void *msg_header; 19756e14eab9SNicholas Bellinger int ret = -ENOMEM; 19767c9e7a6fSAndy Grover 19777c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 19787c9e7a6fSAndy Grover if (!skb) 19796e14eab9SNicholas Bellinger return ret; 19807c9e7a6fSAndy Grover 19817c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 19826e14eab9SNicholas Bellinger if (!msg_header) 19836e14eab9SNicholas Bellinger goto free_skb; 19847c9e7a6fSAndy Grover 1985b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 19866e14eab9SNicholas Bellinger if (ret < 0) 19876e14eab9SNicholas Bellinger goto free_skb; 19887c9e7a6fSAndy Grover 1989b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1990b3af66e2SMike Christie if (ret < 0) 1991b3af66e2SMike Christie goto free_skb; 1992b3af66e2SMike Christie 1993b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 19946e14eab9SNicholas Bellinger if (ret < 0) 19956e14eab9SNicholas Bellinger goto free_skb; 19967c9e7a6fSAndy Grover 19970e5aee39SZhu Lingshan *buf = skb; 19980e5aee39SZhu Lingshan *hdr = msg_header; 19990e5aee39SZhu Lingshan return ret; 20000e5aee39SZhu Lingshan 20010e5aee39SZhu Lingshan free_skb: 20020e5aee39SZhu Lingshan nlmsg_free(skb); 20030e5aee39SZhu Lingshan return ret; 20042d76443eSMike Christie } 20052d76443eSMike Christie 20060e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 20070e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 200806add777SMike Christie struct sk_buff *skb, void *msg_header) 20090e5aee39SZhu Lingshan { 201006add777SMike Christie int ret; 20118a45885cSBryant G. Ly 2012053c095aSJohannes Berg genlmsg_end(skb, msg_header); 20137c9e7a6fSAndy Grover 20149de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 20159de3a1efSMike Christie if (ret) { 20169de3a1efSMike Christie nlmsg_free(skb); 20179de3a1efSMike Christie return ret; 20189de3a1efSMike Christie } 2019b3af66e2SMike Christie 202020c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 20217c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 20222ff717cdSCathy Avery 20232ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 20242ff717cdSCathy Avery if (ret == 0 || 20252ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 20262ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 20277d894862SLi Zhong else 20287d894862SLi Zhong tcmu_destroy_genl_cmd_reply(udev); 20292ff717cdSCathy Avery 20300e5aee39SZhu Lingshan return ret; 20310e5aee39SZhu Lingshan } 20327c9e7a6fSAndy Grover 2033e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 2034e0c240acSZhu Lingshan { 2035e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 2036e0c240acSZhu Lingshan void *msg_header = NULL; 2037e0c240acSZhu Lingshan int ret = 0; 2038e0c240acSZhu Lingshan 2039e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 2040e0c240acSZhu Lingshan &msg_header); 2041e0c240acSZhu Lingshan if (ret < 0) 20427c9e7a6fSAndy Grover return ret; 204306add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 204406add777SMike Christie msg_header); 2045e0c240acSZhu Lingshan } 2046e0c240acSZhu Lingshan 2047f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 2048f892bd8eSZhu Lingshan { 2049f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 2050f892bd8eSZhu Lingshan void *msg_header = NULL; 2051f892bd8eSZhu Lingshan int ret = 0; 2052f892bd8eSZhu Lingshan 2053f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 2054f892bd8eSZhu Lingshan &skb, &msg_header); 2055f892bd8eSZhu Lingshan if (ret < 0) 20566e14eab9SNicholas Bellinger return ret; 2057f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 205806add777SMike Christie skb, msg_header); 20597c9e7a6fSAndy Grover } 20607c9e7a6fSAndy Grover 2061de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 20627c9e7a6fSAndy Grover { 20637c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 20647c9e7a6fSAndy Grover struct uio_info *info; 20657c9e7a6fSAndy Grover char *str; 20667c9e7a6fSAndy Grover 20677c9e7a6fSAndy Grover info = &udev->uio_info; 206822c2f35fSChristophe JAILLET 206922c2f35fSChristophe JAILLET if (udev->dev_config[0]) 207022c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, 207122c2f35fSChristophe JAILLET udev->name, udev->dev_config); 207222c2f35fSChristophe JAILLET else 207322c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, 207422c2f35fSChristophe JAILLET udev->name); 20757c9e7a6fSAndy Grover if (!str) 20767c9e7a6fSAndy Grover return -ENOMEM; 20777c9e7a6fSAndy Grover 2078ededd039SBryant G. Ly /* If the old string exists, free it */ 2079ededd039SBryant G. Ly kfree(info->name); 20807c9e7a6fSAndy Grover info->name = str; 20817c9e7a6fSAndy Grover 2082de8c5221SBryant G. Ly return 0; 2083de8c5221SBryant G. Ly } 2084de8c5221SBryant G. Ly 2085de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 2086de8c5221SBryant G. Ly { 2087de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 2088de8c5221SBryant G. Ly struct uio_info *info; 2089de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 2090de8c5221SBryant G. Ly int ret = 0; 2091de8c5221SBryant G. Ly 2092de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2093de8c5221SBryant G. Ly if (ret) 2094de8c5221SBryant G. Ly return ret; 2095de8c5221SBryant G. Ly 2096de8c5221SBryant G. Ly info = &udev->uio_info; 2097de8c5221SBryant G. Ly 2098c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 209998effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 2100c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2101a24e7917SWei Yongjun if (!udev->data_bitmap) { 2102a24e7917SWei Yongjun ret = -ENOMEM; 210380eb8761SMike Christie goto err_bitmap_alloc; 2104a24e7917SWei Yongjun } 210580eb8761SMike Christie 2106*ecddbb7eSBodo Stroesser mb = vzalloc(MB_CMDR_SIZE); 2107*ecddbb7eSBodo Stroesser if (!mb) { 21087c9e7a6fSAndy Grover ret = -ENOMEM; 21097c9e7a6fSAndy Grover goto err_vzalloc; 21107c9e7a6fSAndy Grover } 21117c9e7a6fSAndy Grover 21127c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 2113*ecddbb7eSBodo Stroesser udev->mb_addr = mb; 2114*ecddbb7eSBodo Stroesser udev->cmdr = (void *)mb + CMDR_OFF; 2115*ecddbb7eSBodo Stroesser udev->cmdr_size = CMDR_SIZE; 2116*ecddbb7eSBodo Stroesser udev->data_off = MB_CMDR_SIZE; 211780eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 2118*ecddbb7eSBodo Stroesser udev->mmap_pages = (udev->data_size + MB_CMDR_SIZE) >> PAGE_SHIFT; 2119b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 21207c9e7a6fSAndy Grover 2121141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 21220ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 2123bc2d214aSBodo Stroesser mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | 2124bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_READ_LEN | 2125bc2d214aSBodo Stroesser TCMU_MAILBOX_FLAG_CAP_TMR; 21267c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 21277c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 21287c9e7a6fSAndy Grover 21297c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 21307c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 213126418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 21327c9e7a6fSAndy Grover 2133ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 21347c9e7a6fSAndy Grover 21357c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 21360633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 2137*ecddbb7eSBodo Stroesser info->mem[0].size = udev->data_size + MB_CMDR_SIZE; 2138141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 21397c9e7a6fSAndy Grover 21407c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 21417c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 21427c9e7a6fSAndy Grover 21437c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 21447c9e7a6fSAndy Grover info->open = tcmu_open; 21457c9e7a6fSAndy Grover info->release = tcmu_release; 21467c9e7a6fSAndy Grover 21477c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 21487c9e7a6fSAndy Grover if (ret) 21497c9e7a6fSAndy Grover goto err_register; 21507c9e7a6fSAndy Grover 215181ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 215281ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 21537c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 215481ee28deSSheng Yang /* Other attributes can be configured in userspace */ 21553abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 21567c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 21579a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 21589a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 21597c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 21607c9e7a6fSAndy Grover 2161b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 2162b849b456SKenjiro Nakayama * module scope setting. 2163b849b456SKenjiro Nakayama */ 2164b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 2165b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 2166b849b456SKenjiro Nakayama 2167f3cdbe39SMike Christie /* 2168f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 2169f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 2170f3cdbe39SMike Christie */ 2171f3cdbe39SMike Christie kref_get(&udev->kref); 2172f3cdbe39SMike Christie 2173e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 21747c9e7a6fSAndy Grover if (ret) 21757c9e7a6fSAndy Grover goto err_netlink; 21767c9e7a6fSAndy Grover 2177b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2178b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 2179b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2180b6df4b79SXiubo Li 21817c9e7a6fSAndy Grover return 0; 21827c9e7a6fSAndy Grover 21837c9e7a6fSAndy Grover err_netlink: 2184f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 21857c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 21867c9e7a6fSAndy Grover err_register: 21877c9e7a6fSAndy Grover vfree(udev->mb_addr); 2188c22adc0bSXiubo Li udev->mb_addr = NULL; 21897c9e7a6fSAndy Grover err_vzalloc: 219098effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 219180eb8761SMike Christie udev->data_bitmap = NULL; 219280eb8761SMike Christie err_bitmap_alloc: 21937c9e7a6fSAndy Grover kfree(info->name); 2194f3cdbe39SMike Christie info->name = NULL; 21957c9e7a6fSAndy Grover 21967c9e7a6fSAndy Grover return ret; 21977c9e7a6fSAndy Grover } 21987c9e7a6fSAndy Grover 21997c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 22007c9e7a6fSAndy Grover { 22017c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 220292634706SMike Christie 220392634706SMike Christie /* release ref from init */ 220492634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 220592634706SMike Christie } 220692634706SMike Christie 220792634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 220892634706SMike Christie { 220992634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 22107c9e7a6fSAndy Grover 22119103575aSMike Christie del_timer_sync(&udev->cmd_timer); 22129103575aSMike Christie del_timer_sync(&udev->qfull_timer); 22137c9e7a6fSAndy Grover 2214b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2215b6df4b79SXiubo Li list_del(&udev->node); 2216b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 2217b6df4b79SXiubo Li 2218f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 22197c9e7a6fSAndy Grover 22207c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 22219260695dSMike Christie 22229260695dSMike Christie /* release ref from configure */ 22239260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 22247c9e7a6fSAndy Grover } 22257c9e7a6fSAndy Grover 2226892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 2227892782caSMike Christie { 2228892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2229892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 2230892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2231892782caSMike Christie } 2232892782caSMike Christie 2233892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 2234892782caSMike Christie { 2235892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2236892782caSMike Christie 2237892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2238892782caSMike Christie goto unlock; 2239892782caSMike Christie 2240892782caSMike Christie /* complete IO that has executed successfully */ 2241892782caSMike Christie tcmu_handle_completions(udev); 2242892782caSMike Christie /* fail IO waiting to be queued */ 2243a94a2572SXiubo Li run_qfull_queue(udev, true); 2244892782caSMike Christie 2245892782caSMike Christie unlock: 2246892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2247892782caSMike Christie } 2248892782caSMike Christie 2249892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2250892782caSMike Christie { 2251892782caSMike Christie struct tcmu_mailbox *mb; 2252892782caSMike Christie struct tcmu_cmd *cmd; 2253d3cbb743SBodo Stroesser unsigned long i; 2254892782caSMike Christie 2255892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2256892782caSMike Christie 2257d3cbb743SBodo Stroesser xa_for_each(&udev->commands, i, cmd) { 2258892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2259892782caSMike Christie cmd->cmd_id, udev->name, 2260892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2261892782caSMike Christie 2262d3cbb743SBodo Stroesser xa_erase(&udev->commands, i); 2263892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2264a86a7586SDmitry Fomichev WARN_ON(!cmd->se_cmd); 2265a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2266780e1384SShin'ichiro Kawasaki cmd->se_cmd->priv = NULL; 2267892782caSMike Christie if (err_level == 1) { 2268892782caSMike Christie /* 2269892782caSMike Christie * Userspace was not able to start the 2270892782caSMike Christie * command or it is retryable. 2271892782caSMike Christie */ 2272892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2273892782caSMike Christie } else { 2274892782caSMike Christie /* hard failure */ 2275892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2276892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2277892782caSMike Christie } 2278892782caSMike Christie } 2279892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2280892782caSMike Christie tcmu_free_cmd(cmd); 2281892782caSMike Christie } 2282892782caSMike Christie 2283892782caSMike Christie mb = udev->mb_addr; 2284892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2285892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2286892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2287892782caSMike Christie 2288892782caSMike Christie udev->cmdr_last_cleaned = 0; 2289892782caSMike Christie mb->cmd_tail = 0; 2290892782caSMike Christie mb->cmd_head = 0; 2291892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2292066f79a5SBodo Stroesser clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 2293892782caSMike Christie 2294892782caSMike Christie del_timer(&udev->cmd_timer); 2295892782caSMike Christie 2296bc2d214aSBodo Stroesser /* 2297bc2d214aSBodo Stroesser * ring is empty and qfull queue never contains aborted commands. 2298bc2d214aSBodo Stroesser * So TMRs in tmr queue do not contain relevant cmd_ids. 2299bc2d214aSBodo Stroesser * After a ring reset userspace should do a fresh start, so 2300bc2d214aSBodo Stroesser * even LUN RESET message is no longer relevant. 2301bc2d214aSBodo Stroesser * Therefore remove all TMRs from qfull queue 2302bc2d214aSBodo Stroesser */ 2303bc2d214aSBodo Stroesser tcmu_remove_all_queued_tmr(udev); 2304bc2d214aSBodo Stroesser 230561fb2482SBodo Stroesser run_qfull_queue(udev, false); 230661fb2482SBodo Stroesser 2307892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2308892782caSMike Christie } 2309892782caSMike Christie 23107c9e7a6fSAndy Grover enum { 23113abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 231280eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 23137c9e7a6fSAndy Grover }; 23147c9e7a6fSAndy Grover 23157c9e7a6fSAndy Grover static match_table_t tokens = { 23167c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 23170e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2318b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2319b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2320b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2321c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 23227c9e7a6fSAndy Grover {Opt_err, NULL} 23237c9e7a6fSAndy Grover }; 23247c9e7a6fSAndy Grover 23253abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 23263abaa2bfSMike Christie { 2327b60cb1f8SMike Christie int val, ret; 23283abaa2bfSMike Christie 2329b60cb1f8SMike Christie ret = match_int(arg, &val); 23303abaa2bfSMike Christie if (ret < 0) { 2331b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2332b60cb1f8SMike Christie ret); 23333abaa2bfSMike Christie return ret; 23343abaa2bfSMike Christie } 2335b60cb1f8SMike Christie 2336b60cb1f8SMike Christie if (val <= 0) { 2337b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2338b60cb1f8SMike Christie val); 23393abaa2bfSMike Christie return -EINVAL; 23403abaa2bfSMike Christie } 2341b60cb1f8SMike Christie *dev_attrib = val; 23423abaa2bfSMike Christie return 0; 23433abaa2bfSMike Christie } 23443abaa2bfSMike Christie 2345c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2346c97840c8SMike Christie { 2347c97840c8SMike Christie int val, ret; 2348c97840c8SMike Christie 2349c97840c8SMike Christie ret = match_int(arg, &val); 2350c97840c8SMike Christie if (ret < 0) { 2351c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2352c97840c8SMike Christie ret); 2353c97840c8SMike Christie return ret; 2354c97840c8SMike Christie } 2355c97840c8SMike Christie 2356c97840c8SMike Christie if (val <= 0) { 2357c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2358c97840c8SMike Christie return -EINVAL; 2359c97840c8SMike Christie } 2360c97840c8SMike Christie 2361c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2362c97840c8SMike Christie if (udev->data_bitmap) { 2363c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2364c97840c8SMike Christie ret = -EINVAL; 2365c97840c8SMike Christie goto unlock; 2366c97840c8SMike Christie } 2367c97840c8SMike Christie 2368c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2369c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2370c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2371c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2372c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2373c97840c8SMike Christie } 2374c97840c8SMike Christie 2375c97840c8SMike Christie unlock: 2376c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2377c97840c8SMike Christie return ret; 2378c97840c8SMike Christie } 2379c97840c8SMike Christie 23807c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 23817c9e7a6fSAndy Grover const char *page, ssize_t count) 23827c9e7a6fSAndy Grover { 23837c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 23840e0d7526SMike Christie char *orig, *ptr, *opts; 23857c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2386c97840c8SMike Christie int ret = 0, token; 23877c9e7a6fSAndy Grover 23887c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 23897c9e7a6fSAndy Grover if (!opts) 23907c9e7a6fSAndy Grover return -ENOMEM; 23917c9e7a6fSAndy Grover 23927c9e7a6fSAndy Grover orig = opts; 23937c9e7a6fSAndy Grover 23947c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 23957c9e7a6fSAndy Grover if (!*ptr) 23967c9e7a6fSAndy Grover continue; 23977c9e7a6fSAndy Grover 23987c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 23997c9e7a6fSAndy Grover switch (token) { 24007c9e7a6fSAndy Grover case Opt_dev_config: 24017c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 24027c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 24037c9e7a6fSAndy Grover ret = -EINVAL; 24047c9e7a6fSAndy Grover break; 24057c9e7a6fSAndy Grover } 24067c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 24077c9e7a6fSAndy Grover break; 24087c9e7a6fSAndy Grover case Opt_dev_size: 24090e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 24107c9e7a6fSAndy Grover if (ret < 0) 24110e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 24120e0d7526SMike Christie ret); 24137c9e7a6fSAndy Grover break; 24149c1cd1b6SAndy Grover case Opt_hw_block_size: 24153abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 24163abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 24179c1cd1b6SAndy Grover break; 24183abaa2bfSMike Christie case Opt_hw_max_sectors: 24193abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 24203abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 24219c1cd1b6SAndy Grover break; 2422b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2423b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2424b849b456SKenjiro Nakayama if (ret < 0) 2425b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2426b60cb1f8SMike Christie ret); 2427b849b456SKenjiro Nakayama break; 242880eb8761SMike Christie case Opt_max_data_area_mb: 2429c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 243080eb8761SMike Christie break; 24317c9e7a6fSAndy Grover default: 24327c9e7a6fSAndy Grover break; 24337c9e7a6fSAndy Grover } 24342579325cSMike Christie 24352579325cSMike Christie if (ret) 24362579325cSMike Christie break; 24377c9e7a6fSAndy Grover } 24387c9e7a6fSAndy Grover 24397c9e7a6fSAndy Grover kfree(orig); 24407c9e7a6fSAndy Grover return (!ret) ? count : ret; 24417c9e7a6fSAndy Grover } 24427c9e7a6fSAndy Grover 24437c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 24447c9e7a6fSAndy Grover { 24457c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 24467c9e7a6fSAndy Grover ssize_t bl = 0; 24477c9e7a6fSAndy Grover 24487c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 24497c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 24500e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 245180eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 245280eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 24537c9e7a6fSAndy Grover 24547c9e7a6fSAndy Grover return bl; 24557c9e7a6fSAndy Grover } 24567c9e7a6fSAndy Grover 24577c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 24587c9e7a6fSAndy Grover { 24597c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 24607c9e7a6fSAndy Grover 24617c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 24627c9e7a6fSAndy Grover dev->dev_attrib.block_size); 24637c9e7a6fSAndy Grover } 24647c9e7a6fSAndy Grover 24657c9e7a6fSAndy Grover static sense_reason_t 24667c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 24677c9e7a6fSAndy Grover { 246802eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 24699c1cd1b6SAndy Grover } 24709c1cd1b6SAndy Grover 24717d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 24727d7a7435SNicholas Bellinger { 24737d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24747d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2475b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24767d7a7435SNicholas Bellinger 24777d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 24787d7a7435SNicholas Bellinger } 24797d7a7435SNicholas Bellinger 24807d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 24817d7a7435SNicholas Bellinger size_t count) 24827d7a7435SNicholas Bellinger { 24837d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 24847d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 24857d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 24867d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 24877d7a7435SNicholas Bellinger u32 val; 24887d7a7435SNicholas Bellinger int ret; 24897d7a7435SNicholas Bellinger 24907d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 24917d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 24927d7a7435SNicholas Bellinger return -EINVAL; 24937d7a7435SNicholas Bellinger } 24947d7a7435SNicholas Bellinger 24957d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 24967d7a7435SNicholas Bellinger if (ret < 0) 24977d7a7435SNicholas Bellinger return ret; 24987d7a7435SNicholas Bellinger 24997d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 25007d7a7435SNicholas Bellinger return count; 25017d7a7435SNicholas Bellinger } 25027d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 25037d7a7435SNicholas Bellinger 25049103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 25059103575aSMike Christie { 25069103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 25079103575aSMike Christie struct se_dev_attrib, da_group); 25089103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25099103575aSMike Christie 25109103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 25119103575aSMike Christie udev->qfull_time_out : 25129103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 25139103575aSMike Christie } 25149103575aSMike Christie 25159103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 25169103575aSMike Christie const char *page, size_t count) 25179103575aSMike Christie { 25189103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 25199103575aSMike Christie struct se_dev_attrib, da_group); 25209103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25219103575aSMike Christie s32 val; 25229103575aSMike Christie int ret; 25239103575aSMike Christie 25249103575aSMike Christie ret = kstrtos32(page, 0, &val); 25259103575aSMike Christie if (ret < 0) 25269103575aSMike Christie return ret; 25279103575aSMike Christie 25289103575aSMike Christie if (val >= 0) { 25299103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2530125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2531125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 25329103575aSMike Christie } else { 25339103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 25349103575aSMike Christie return -EINVAL; 25359103575aSMike Christie } 25369103575aSMike Christie return count; 25379103575aSMike Christie } 25389103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 25399103575aSMike Christie 254080eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 254180eb8761SMike Christie { 254280eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 254380eb8761SMike Christie struct se_dev_attrib, da_group); 254480eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 254580eb8761SMike Christie 254680eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 254780eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 254880eb8761SMike Christie } 254980eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 255080eb8761SMike Christie 25512d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2552ee018252SBryant G. Ly { 2553ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2554ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2555ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2556ee018252SBryant G. Ly 2557ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2558ee018252SBryant G. Ly } 2559ee018252SBryant G. Ly 256002ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 256102ccfb54SZhu Lingshan const char *reconfig_data) 256202ccfb54SZhu Lingshan { 256302ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 256402ccfb54SZhu Lingshan void *msg_header = NULL; 256502ccfb54SZhu Lingshan int ret = 0; 256602ccfb54SZhu Lingshan 256702ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 256802ccfb54SZhu Lingshan &skb, &msg_header); 256902ccfb54SZhu Lingshan if (ret < 0) 257002ccfb54SZhu Lingshan return ret; 257102ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 257202ccfb54SZhu Lingshan if (ret < 0) { 257302ccfb54SZhu Lingshan nlmsg_free(skb); 257402ccfb54SZhu Lingshan return ret; 257502ccfb54SZhu Lingshan } 257602ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 257706add777SMike Christie skb, msg_header); 257802ccfb54SZhu Lingshan } 257902ccfb54SZhu Lingshan 258002ccfb54SZhu Lingshan 25812d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2582ee018252SBryant G. Ly size_t count) 2583ee018252SBryant G. Ly { 2584ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2585ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2586ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 25872d76443eSMike Christie int ret, len; 2588ee018252SBryant G. Ly 25892d76443eSMike Christie len = strlen(page); 25902d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2591ee018252SBryant G. Ly return -EINVAL; 2592ee018252SBryant G. Ly 2593ee018252SBryant G. Ly /* Check if device has been configured before */ 259463d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 259502ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2596ee018252SBryant G. Ly if (ret) { 2597ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2598ee018252SBryant G. Ly return ret; 2599ee018252SBryant G. Ly } 2600de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2601de8c5221SBryant G. Ly 2602de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2603de8c5221SBryant G. Ly if (ret) 2604de8c5221SBryant G. Ly return ret; 2605de8c5221SBryant G. Ly return count; 2606ee018252SBryant G. Ly } 26072d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2608ee018252SBryant G. Ly 2609ee018252SBryant G. Ly return count; 2610ee018252SBryant G. Ly } 26112d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2612ee018252SBryant G. Ly 2613801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2614801fc54dSBryant G. Ly { 2615801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2616801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2617801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2618801fc54dSBryant G. Ly 26190e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2620801fc54dSBryant G. Ly } 2621801fc54dSBryant G. Ly 262284e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 262384e28506SZhu Lingshan { 262484e28506SZhu Lingshan struct sk_buff *skb = NULL; 262584e28506SZhu Lingshan void *msg_header = NULL; 262684e28506SZhu Lingshan int ret = 0; 262784e28506SZhu Lingshan 262884e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 262984e28506SZhu Lingshan &skb, &msg_header); 263084e28506SZhu Lingshan if (ret < 0) 263184e28506SZhu Lingshan return ret; 263284e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 263384e28506SZhu Lingshan size, TCMU_ATTR_PAD); 263484e28506SZhu Lingshan if (ret < 0) { 263584e28506SZhu Lingshan nlmsg_free(skb); 263684e28506SZhu Lingshan return ret; 263784e28506SZhu Lingshan } 263884e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 263906add777SMike Christie skb, msg_header); 264084e28506SZhu Lingshan } 264184e28506SZhu Lingshan 2642801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2643801fc54dSBryant G. Ly size_t count) 2644801fc54dSBryant G. Ly { 2645801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2646801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2647801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 26482d76443eSMike Christie u64 val; 2649801fc54dSBryant G. Ly int ret; 2650801fc54dSBryant G. Ly 26512d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2652801fc54dSBryant G. Ly if (ret < 0) 2653801fc54dSBryant G. Ly return ret; 2654801fc54dSBryant G. Ly 2655801fc54dSBryant G. Ly /* Check if device has been configured before */ 265663d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 265784e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2658801fc54dSBryant G. Ly if (ret) { 2659801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2660801fc54dSBryant G. Ly return ret; 2661801fc54dSBryant G. Ly } 2662801fc54dSBryant G. Ly } 26632d76443eSMike Christie udev->dev_size = val; 2664801fc54dSBryant G. Ly return count; 2665801fc54dSBryant G. Ly } 2666801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2667801fc54dSBryant G. Ly 2668b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2669b849b456SKenjiro Nakayama char *page) 2670b849b456SKenjiro Nakayama { 2671b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2672b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2673b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2674b849b456SKenjiro Nakayama 2675b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2676b849b456SKenjiro Nakayama } 2677b849b456SKenjiro Nakayama 2678b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2679b849b456SKenjiro Nakayama const char *page, size_t count) 2680b849b456SKenjiro Nakayama { 2681b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2682b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2683b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2684b849b456SKenjiro Nakayama s8 val; 2685b849b456SKenjiro Nakayama int ret; 2686b849b456SKenjiro Nakayama 2687b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2688b849b456SKenjiro Nakayama if (ret < 0) 2689b849b456SKenjiro Nakayama return ret; 2690b849b456SKenjiro Nakayama 2691b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2692b849b456SKenjiro Nakayama return count; 2693b849b456SKenjiro Nakayama } 2694b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2695b849b456SKenjiro Nakayama 26969a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 26979a8bb606SBryant G. Ly char *page) 26989a8bb606SBryant G. Ly { 26999a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 27009a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 27019a8bb606SBryant G. Ly 27029a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 27039a8bb606SBryant G. Ly } 27049a8bb606SBryant G. Ly 270533d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 270633d065ccSZhu Lingshan { 270733d065ccSZhu Lingshan struct sk_buff *skb = NULL; 270833d065ccSZhu Lingshan void *msg_header = NULL; 270933d065ccSZhu Lingshan int ret = 0; 271033d065ccSZhu Lingshan 271133d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 271233d065ccSZhu Lingshan &skb, &msg_header); 271333d065ccSZhu Lingshan if (ret < 0) 271433d065ccSZhu Lingshan return ret; 271533d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 271633d065ccSZhu Lingshan if (ret < 0) { 271733d065ccSZhu Lingshan nlmsg_free(skb); 271833d065ccSZhu Lingshan return ret; 271933d065ccSZhu Lingshan } 272033d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 272106add777SMike Christie skb, msg_header); 272233d065ccSZhu Lingshan } 272333d065ccSZhu Lingshan 27249a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 27259a8bb606SBryant G. Ly const char *page, size_t count) 27269a8bb606SBryant G. Ly { 27279a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 27289a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 27291068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 27302d76443eSMike Christie u8 val; 27319a8bb606SBryant G. Ly int ret; 27329a8bb606SBryant G. Ly 27332d76443eSMike Christie ret = kstrtou8(page, 0, &val); 27349a8bb606SBryant G. Ly if (ret < 0) 27359a8bb606SBryant G. Ly return ret; 27369a8bb606SBryant G. Ly 27371068be7bSBryant G. Ly /* Check if device has been configured before */ 273863d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 273933d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 27401068be7bSBryant G. Ly if (ret) { 27411068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 27421068be7bSBryant G. Ly return ret; 27431068be7bSBryant G. Ly } 27441068be7bSBryant G. Ly } 27452d76443eSMike Christie 27462d76443eSMike Christie da->emulate_write_cache = val; 27479a8bb606SBryant G. Ly return count; 27489a8bb606SBryant G. Ly } 27499a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 27509a8bb606SBryant G. Ly 275159526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) 275259526d7aSBodo Stroesser { 275359526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 275459526d7aSBodo Stroesser struct se_dev_attrib, da_group); 275559526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 275659526d7aSBodo Stroesser 275759526d7aSBodo Stroesser return snprintf(page, PAGE_SIZE, "%i\n", 275859526d7aSBodo Stroesser test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); 275959526d7aSBodo Stroesser } 276059526d7aSBodo Stroesser 276159526d7aSBodo Stroesser static ssize_t tcmu_tmr_notification_store(struct config_item *item, 276259526d7aSBodo Stroesser const char *page, size_t count) 276359526d7aSBodo Stroesser { 276459526d7aSBodo Stroesser struct se_dev_attrib *da = container_of(to_config_group(item), 276559526d7aSBodo Stroesser struct se_dev_attrib, da_group); 276659526d7aSBodo Stroesser struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 276759526d7aSBodo Stroesser u8 val; 276859526d7aSBodo Stroesser int ret; 276959526d7aSBodo Stroesser 277059526d7aSBodo Stroesser ret = kstrtou8(page, 0, &val); 277159526d7aSBodo Stroesser if (ret < 0) 277259526d7aSBodo Stroesser return ret; 277359526d7aSBodo Stroesser if (val > 1) 277459526d7aSBodo Stroesser return -EINVAL; 277559526d7aSBodo Stroesser 277659526d7aSBodo Stroesser if (val) 277759526d7aSBodo Stroesser set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 277859526d7aSBodo Stroesser else 277959526d7aSBodo Stroesser clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); 278059526d7aSBodo Stroesser return count; 278159526d7aSBodo Stroesser } 278259526d7aSBodo Stroesser CONFIGFS_ATTR(tcmu_, tmr_notification); 278359526d7aSBodo Stroesser 2784892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2785892782caSMike Christie { 2786892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2787892782caSMike Christie struct se_device, 2788892782caSMike Christie dev_action_group); 2789892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2790892782caSMike Christie 2791892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2792892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2793892782caSMike Christie else 2794892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2795892782caSMike Christie } 2796892782caSMike Christie 2797892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2798892782caSMike Christie size_t count) 2799892782caSMike Christie { 2800892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2801892782caSMike Christie struct se_device, 2802892782caSMike Christie dev_action_group); 2803892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2804892782caSMike Christie u8 val; 2805892782caSMike Christie int ret; 2806892782caSMike Christie 2807a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2808a30b0473SMike Christie pr_err("Device is not configured.\n"); 2809a30b0473SMike Christie return -EINVAL; 2810a30b0473SMike Christie } 2811a30b0473SMike Christie 2812892782caSMike Christie ret = kstrtou8(page, 0, &val); 2813892782caSMike Christie if (ret < 0) 2814892782caSMike Christie return ret; 2815892782caSMike Christie 2816892782caSMike Christie if (val > 1) { 2817892782caSMike Christie pr_err("Invalid block value %d\n", val); 2818892782caSMike Christie return -EINVAL; 2819892782caSMike Christie } 2820892782caSMike Christie 2821892782caSMike Christie if (!val) 2822892782caSMike Christie tcmu_unblock_dev(udev); 2823892782caSMike Christie else 2824892782caSMike Christie tcmu_block_dev(udev); 2825892782caSMike Christie return count; 2826892782caSMike Christie } 2827892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2828892782caSMike Christie 2829892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2830892782caSMike Christie size_t count) 2831892782caSMike Christie { 2832892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2833892782caSMike Christie struct se_device, 2834892782caSMike Christie dev_action_group); 2835892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2836892782caSMike Christie u8 val; 2837892782caSMike Christie int ret; 2838892782caSMike Christie 2839a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2840a30b0473SMike Christie pr_err("Device is not configured.\n"); 2841a30b0473SMike Christie return -EINVAL; 2842a30b0473SMike Christie } 2843a30b0473SMike Christie 2844892782caSMike Christie ret = kstrtou8(page, 0, &val); 2845892782caSMike Christie if (ret < 0) 2846892782caSMike Christie return ret; 2847892782caSMike Christie 2848892782caSMike Christie if (val != 1 && val != 2) { 2849892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2850892782caSMike Christie return -EINVAL; 2851892782caSMike Christie } 2852892782caSMike Christie 2853892782caSMike Christie tcmu_reset_ring(udev, val); 2854892782caSMike Christie return count; 2855892782caSMike Christie } 2856892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2857892782caSMike Christie 28585821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2859801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 28609103575aSMike Christie &tcmu_attr_qfull_time_out, 286180eb8761SMike Christie &tcmu_attr_max_data_area_mb, 28622d76443eSMike Christie &tcmu_attr_dev_config, 2863801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2864801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 286559526d7aSBodo Stroesser &tcmu_attr_tmr_notification, 2866b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2867801fc54dSBryant G. Ly NULL, 2868801fc54dSBryant G. Ly }; 2869801fc54dSBryant G. Ly 28707d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 28717d7a7435SNicholas Bellinger 2872892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2873892782caSMike Christie &tcmu_attr_block_dev, 2874892782caSMike Christie &tcmu_attr_reset_ring, 2875892782caSMike Christie NULL, 2876892782caSMike Christie }; 2877892782caSMike Christie 28787d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 28797c9e7a6fSAndy Grover .name = "user", 28807c9e7a6fSAndy Grover .owner = THIS_MODULE, 288169088a04SBodo Stroesser .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, 2882356ba2a8SBodo Stroesser .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | 2883356ba2a8SBodo Stroesser TRANSPORT_FLAG_PASSTHROUGH_ALUA, 28847c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 28857c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 28867c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 28877c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 288892634706SMike Christie .destroy_device = tcmu_destroy_device, 28897c9e7a6fSAndy Grover .free_device = tcmu_free_device, 28906888da81SMike Christie .unplug_device = tcmu_unplug_device, 28916888da81SMike Christie .plug_device = tcmu_plug_device, 28927c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 2893bc2d214aSBodo Stroesser .tmr_notify = tcmu_tmr_notify, 28947c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 28957c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 28967c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 28977c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2898892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 28997c9e7a6fSAndy Grover }; 29007c9e7a6fSAndy Grover 290189ec9cfdSMike Christie static void find_free_blocks(void) 2902b6df4b79SXiubo Li { 2903b6df4b79SXiubo Li struct tcmu_dev *udev; 2904b6df4b79SXiubo Li loff_t off; 2905af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2906af1dd7ffSMike Christie 290780eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2908af1dd7ffSMike Christie return; 2909b6df4b79SXiubo Li 2910b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2911b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2912b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2913b6df4b79SXiubo Li 2914dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2915dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2916dc335a99SMike Christie continue; 2917dc335a99SMike Christie } 2918dc335a99SMike Christie 2919b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2920bc2d214aSBodo Stroesser if (tcmu_handle_completions(udev)) 2921bc2d214aSBodo Stroesser run_qfull_queue(udev, false); 2922b6df4b79SXiubo Li 2923af1dd7ffSMike Christie /* Skip the udevs in idle */ 2924af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2925b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2926b6df4b79SXiubo Li continue; 2927b6df4b79SXiubo Li } 2928b6df4b79SXiubo Li 2929b6df4b79SXiubo Li end = udev->dbi_max + 1; 2930b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2931b6df4b79SXiubo Li if (block == udev->dbi_max) { 2932b6df4b79SXiubo Li /* 2933af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2934af1dd7ffSMike Christie * reclaim any blocks. 2935b6df4b79SXiubo Li */ 2936b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2937b6df4b79SXiubo Li continue; 2938b6df4b79SXiubo Li } else if (block == end) { 2939b6df4b79SXiubo Li /* The current udev will goto idle state */ 2940b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2941b6df4b79SXiubo Li udev->dbi_max = 0; 2942b6df4b79SXiubo Li } else { 2943b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2944b6df4b79SXiubo Li udev->dbi_max = block; 2945b6df4b79SXiubo Li } 2946b6df4b79SXiubo Li 2947b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2948b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2949b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2950b6df4b79SXiubo Li 2951b6df4b79SXiubo Li /* Release the block pages */ 2952f7c89771SBodo Stroesser tcmu_blocks_release(&udev->data_blocks, start, end - 1); 2953b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2954af1dd7ffSMike Christie 2955af1dd7ffSMike Christie total_freed += end - start; 2956af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2957af1dd7ffSMike Christie total_freed, udev->name); 2958b6df4b79SXiubo Li } 295989ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 296089ec9cfdSMike Christie 296180eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2962af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2963b6df4b79SXiubo Li } 2964b6df4b79SXiubo Li 2965488ebe4cSMike Christie static void check_timedout_devices(void) 2966488ebe4cSMike Christie { 2967488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 296861fb2482SBodo Stroesser struct tcmu_cmd *cmd, *tmp_cmd; 2969488ebe4cSMike Christie LIST_HEAD(devs); 2970488ebe4cSMike Christie 2971488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2972488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2973488ebe4cSMike Christie 2974488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2975488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2976488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2977488ebe4cSMike Christie 29786fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2979a94a2572SXiubo Li 298061fb2482SBodo Stroesser /* 298161fb2482SBodo Stroesser * If cmd_time_out is disabled but qfull is set deadline 298261fb2482SBodo Stroesser * will only reflect the qfull timeout. Ignore it. 298361fb2482SBodo Stroesser */ 298461fb2482SBodo Stroesser if (udev->cmd_time_out) { 298561fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, 298661fb2482SBodo Stroesser &udev->inflight_queue, 298761fb2482SBodo Stroesser queue_entry) { 298861fb2482SBodo Stroesser tcmu_check_expired_ring_cmd(cmd); 298961fb2482SBodo Stroesser } 299061fb2482SBodo Stroesser tcmu_set_next_deadline(&udev->inflight_queue, 299161fb2482SBodo Stroesser &udev->cmd_timer); 299261fb2482SBodo Stroesser } 299361fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, 299461fb2482SBodo Stroesser queue_entry) { 299561fb2482SBodo Stroesser tcmu_check_expired_queue_cmd(cmd); 299661fb2482SBodo Stroesser } 2997a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2998a94a2572SXiubo Li 29996fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 3000488ebe4cSMike Christie 3001488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 3002488ebe4cSMike Christie } 3003488ebe4cSMike Christie 3004488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 3005488ebe4cSMike Christie } 3006488ebe4cSMike Christie 30079972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 300889ec9cfdSMike Christie { 3009488ebe4cSMike Christie check_timedout_devices(); 301089ec9cfdSMike Christie find_free_blocks(); 301189ec9cfdSMike Christie } 301289ec9cfdSMike Christie 30137c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 30147c9e7a6fSAndy Grover { 3015801fc54dSBryant G. Ly int ret, i, k, len = 0; 30167c9e7a6fSAndy Grover 30177c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 30187c9e7a6fSAndy Grover 3019af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 30209972cebbSMike Christie 30217c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 30227c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 30237c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 30247c9e7a6fSAndy Grover 0, NULL); 30257c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 30267c9e7a6fSAndy Grover return -ENOMEM; 30277c9e7a6fSAndy Grover 30287c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 30297c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 30307c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 30317c9e7a6fSAndy Grover goto out_free_cache; 30327c9e7a6fSAndy Grover } 30337c9e7a6fSAndy Grover 30347c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 30357c9e7a6fSAndy Grover if (ret < 0) { 30367c9e7a6fSAndy Grover goto out_unreg_device; 30377c9e7a6fSAndy Grover } 30387c9e7a6fSAndy Grover 30394703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 30407d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 30414703b625SBodo Stroesser for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) 3042801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 30434703b625SBodo Stroesser for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) 30444703b625SBodo Stroesser len += sizeof(struct configfs_attribute *); 3045801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 30467d7a7435SNicholas Bellinger 30477d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 30487d7a7435SNicholas Bellinger if (!tcmu_attrs) { 30497d7a7435SNicholas Bellinger ret = -ENOMEM; 30507d7a7435SNicholas Bellinger goto out_unreg_genl; 30517d7a7435SNicholas Bellinger } 30527d7a7435SNicholas Bellinger 30534703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 30547d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 30554703b625SBodo Stroesser for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) 30564703b625SBodo Stroesser tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; 30574703b625SBodo Stroesser for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) 30584703b625SBodo Stroesser tcmu_attrs[i++] = tcmu_attrib_attrs[k]; 30597d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 30607d7a7435SNicholas Bellinger 30610a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 30627c9e7a6fSAndy Grover if (ret) 30637d7a7435SNicholas Bellinger goto out_attrs; 30647c9e7a6fSAndy Grover 30657c9e7a6fSAndy Grover return 0; 30667c9e7a6fSAndy Grover 30677d7a7435SNicholas Bellinger out_attrs: 30687d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30697c9e7a6fSAndy Grover out_unreg_genl: 30707c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30717c9e7a6fSAndy Grover out_unreg_device: 30727c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30737c9e7a6fSAndy Grover out_free_cache: 30747c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30757c9e7a6fSAndy Grover 30767c9e7a6fSAndy Grover return ret; 30777c9e7a6fSAndy Grover } 30787c9e7a6fSAndy Grover 30797c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 30807c9e7a6fSAndy Grover { 3081af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 30820a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 30837d7a7435SNicholas Bellinger kfree(tcmu_attrs); 30847c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 30857c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 30867c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 30877c9e7a6fSAndy Grover } 30887c9e7a6fSAndy Grover 30897c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 30907c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 30917c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 30927c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 30937c9e7a6fSAndy Grover 30947c9e7a6fSAndy Grover module_init(tcmu_module_init); 30957c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 3096