1a61127c2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 27c9e7a6fSAndy Grover /* 37c9e7a6fSAndy Grover * Copyright (C) 2013 Shaohua Li <shli@kernel.org> 47c9e7a6fSAndy Grover * Copyright (C) 2014 Red Hat, Inc. 5f97ec7dbSIlias Tsitsimpis * Copyright (C) 2015 Arrikto, Inc. 6141685a3SXiubo Li * Copyright (C) 2017 Chinamobile, Inc. 77c9e7a6fSAndy Grover */ 87c9e7a6fSAndy Grover 97c9e7a6fSAndy Grover #include <linux/spinlock.h> 107c9e7a6fSAndy Grover #include <linux/module.h> 117c9e7a6fSAndy Grover #include <linux/idr.h> 12ba929992SBart Van Assche #include <linux/kernel.h> 137c9e7a6fSAndy Grover #include <linux/timer.h> 147c9e7a6fSAndy Grover #include <linux/parser.h> 155538d294SDavid S. Miller #include <linux/vmalloc.h> 167c9e7a6fSAndy Grover #include <linux/uio_driver.h> 17141685a3SXiubo Li #include <linux/radix-tree.h> 18ac64a2ceSDavid Disseldorp #include <linux/stringify.h> 1926418649SSheng Yang #include <linux/bitops.h> 20f5045724SBart Van Assche #include <linux/highmem.h> 217d7a7435SNicholas Bellinger #include <linux/configfs.h> 22b6df4b79SXiubo Li #include <linux/mutex.h> 239972cebbSMike Christie #include <linux/workqueue.h> 247c9e7a6fSAndy Grover #include <net/genetlink.h> 25ba929992SBart Van Assche #include <scsi/scsi_common.h> 26ba929992SBart Van Assche #include <scsi/scsi_proto.h> 277c9e7a6fSAndy Grover #include <target/target_core_base.h> 287c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 297c9e7a6fSAndy Grover #include <target/target_core_backend.h> 30e9f720d6SNicholas Bellinger 317c9e7a6fSAndy Grover #include <linux/target_core_user.h> 327c9e7a6fSAndy Grover 33572ccdabSRandy Dunlap /** 34572ccdabSRandy Dunlap * DOC: Userspace I/O 35572ccdabSRandy Dunlap * Userspace I/O 36572ccdabSRandy Dunlap * ------------- 37572ccdabSRandy Dunlap * 387c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 397c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 407c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 417c9e7a6fSAndy Grover * 427c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 437c9e7a6fSAndy Grover * introspection work for us. 447c9e7a6fSAndy Grover * 457c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 467c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 477c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 48572ccdabSRandy Dunlap * internal to the mmap-ed area. There is separate space outside the 497c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 507c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 517c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 527c9e7a6fSAndy Grover * 537c9e7a6fSAndy Grover * SECURITY: 547c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 557c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 567c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 577c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 587c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 597c9e7a6fSAndy Grover * this may have a 'UAM' comment. 607c9e7a6fSAndy Grover */ 617c9e7a6fSAndy Grover 627c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 637c9e7a6fSAndy Grover 64b6df4b79SXiubo Li /* For cmd area, the size is fixed 8MB */ 65b6df4b79SXiubo Li #define CMDR_SIZE (8 * 1024 * 1024) 6626418649SSheng Yang 67b6df4b79SXiubo Li /* 68b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 69b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 70b6df4b79SXiubo Li */ 71b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 7280eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 7380eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 747c9e7a6fSAndy Grover 7580eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 7680eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 7780eb8761SMike Christie 78af1dd7ffSMike Christie /* 79af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 80af1dd7ffSMike Christie * when the unmap thread will be started. 81af1dd7ffSMike Christie */ 8280eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 83b6df4b79SXiubo Li 84b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 85bdaeedc1SMike Christie static u8 tcmu_netlink_blocked; 86b3af66e2SMike Christie 877c9e7a6fSAndy Grover static struct device *tcmu_root_device; 887c9e7a6fSAndy Grover 897c9e7a6fSAndy Grover struct tcmu_hba { 907c9e7a6fSAndy Grover u32 host_id; 917c9e7a6fSAndy Grover }; 927c9e7a6fSAndy Grover 937c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 947c9e7a6fSAndy Grover 953228691fSMike Christie static DEFINE_MUTEX(tcmu_nl_cmd_mutex); 963228691fSMike Christie static LIST_HEAD(tcmu_nl_cmd_list); 973228691fSMike Christie 983228691fSMike Christie struct tcmu_dev; 993228691fSMike Christie 100b3af66e2SMike Christie struct tcmu_nl_cmd { 101b3af66e2SMike Christie /* wake up thread waiting for reply */ 102b3af66e2SMike Christie struct completion complete; 1033228691fSMike Christie struct list_head nl_list; 1043228691fSMike Christie struct tcmu_dev *udev; 105b3af66e2SMike Christie int cmd; 106b3af66e2SMike Christie int status; 107b3af66e2SMike Christie }; 108b3af66e2SMike Christie 1097c9e7a6fSAndy Grover struct tcmu_dev { 110b6df4b79SXiubo Li struct list_head node; 111f3cdbe39SMike Christie struct kref kref; 112af1dd7ffSMike Christie 1137c9e7a6fSAndy Grover struct se_device se_dev; 1147c9e7a6fSAndy Grover 1157c9e7a6fSAndy Grover char *name; 1167c9e7a6fSAndy Grover struct se_hba *hba; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1197c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 120892782caSMike Christie #define TCMU_DEV_BIT_BLOCKED 2 1217c9e7a6fSAndy Grover unsigned long flags; 1227c9e7a6fSAndy Grover 1237c9e7a6fSAndy Grover struct uio_info uio_info; 1247c9e7a6fSAndy Grover 125b6df4b79SXiubo Li struct inode *inode; 126b6df4b79SXiubo Li 1277c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1280e0d7526SMike Christie uint64_t dev_size; 1297c9e7a6fSAndy Grover u32 cmdr_size; 1307c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1313d9b9555SAndy Grover /* Offset of data area from start of mb */ 13226418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1337c9e7a6fSAndy Grover size_t data_off; 1347c9e7a6fSAndy Grover size_t data_size; 13580eb8761SMike Christie uint32_t max_blocks; 13680eb8761SMike Christie size_t ring_size; 13726418649SSheng Yang 138b6df4b79SXiubo Li struct mutex cmdr_lock; 139a94a2572SXiubo Li struct list_head qfull_queue; 1407c9e7a6fSAndy Grover 141141685a3SXiubo Li uint32_t dbi_max; 142b6df4b79SXiubo Li uint32_t dbi_thresh; 14380eb8761SMike Christie unsigned long *data_bitmap; 144141685a3SXiubo Li struct radix_tree_root data_blocks; 145141685a3SXiubo Li 1467c9e7a6fSAndy Grover struct idr commands; 1477c9e7a6fSAndy Grover 1489103575aSMike Christie struct timer_list cmd_timer; 149af980e46SMike Christie unsigned int cmd_time_out; 150a94a2572SXiubo Li struct list_head inflight_queue; 1519103575aSMike Christie 1529103575aSMike Christie struct timer_list qfull_timer; 1539103575aSMike Christie int qfull_time_out; 1549103575aSMike Christie 155488ebe4cSMike Christie struct list_head timedout_entry; 1567c9e7a6fSAndy Grover 157b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 158b3af66e2SMike Christie 1597c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 160b849b456SKenjiro Nakayama 161b849b456SKenjiro Nakayama int nl_reply_supported; 1627c9e7a6fSAndy Grover }; 1637c9e7a6fSAndy Grover 1647c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1657c9e7a6fSAndy Grover 1667c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1677c9e7a6fSAndy Grover 1687c9e7a6fSAndy Grover struct tcmu_cmd { 1697c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1707c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 171a94a2572SXiubo Li struct list_head queue_entry; 1727c9e7a6fSAndy Grover 1737c9e7a6fSAndy Grover uint16_t cmd_id; 1747c9e7a6fSAndy Grover 17526418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1767c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 177141685a3SXiubo Li uint32_t dbi_cnt; 178141685a3SXiubo Li uint32_t dbi_cur; 179141685a3SXiubo Li uint32_t *dbi; 1807c9e7a6fSAndy Grover 1817c9e7a6fSAndy Grover unsigned long deadline; 1827c9e7a6fSAndy Grover 1837c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1847c9e7a6fSAndy Grover unsigned long flags; 1857c9e7a6fSAndy Grover }; 186af1dd7ffSMike Christie /* 187af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 188af1dd7ffSMike Christie * 189af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 190af1dd7ffSMike Christie * ... 191af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 192af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 193af1dd7ffSMike Christie * ... 194af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 195af1dd7ffSMike Christie */ 196b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 197b6df4b79SXiubo Li static LIST_HEAD(root_udev); 198b6df4b79SXiubo Li 199488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 200488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 201488ebe4cSMike Christie 20280eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 20380eb8761SMike Christie 204b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 205af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 20680eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 207b6df4b79SXiubo Li 20880eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 20980eb8761SMike Christie const struct kernel_param *kp) 21080eb8761SMike Christie { 21180eb8761SMike Christie int ret, max_area_mb; 21280eb8761SMike Christie 21380eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 21480eb8761SMike Christie if (ret) 21580eb8761SMike Christie return -EINVAL; 21680eb8761SMike Christie 21780eb8761SMike Christie if (max_area_mb <= 0) { 21880eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 21980eb8761SMike Christie return -EINVAL; 22080eb8761SMike Christie } 22180eb8761SMike Christie 22280eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 22380eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 22480eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 22580eb8761SMike Christie else 22680eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 22780eb8761SMike Christie 22880eb8761SMike Christie return 0; 22980eb8761SMike Christie } 23080eb8761SMike Christie 23180eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 23280eb8761SMike Christie const struct kernel_param *kp) 23380eb8761SMike Christie { 23480eb8761SMike Christie return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 23580eb8761SMike Christie } 23680eb8761SMike Christie 23780eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 23880eb8761SMike Christie .set = tcmu_set_global_max_data_area, 23980eb8761SMike Christie .get = tcmu_get_global_max_data_area, 24080eb8761SMike Christie }; 24180eb8761SMike Christie 24280eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 24380eb8761SMike Christie S_IWUSR | S_IRUGO); 24480eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 24580eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 24680eb8761SMike Christie "data areas."); 2477c9e7a6fSAndy Grover 248bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 249bdaeedc1SMike Christie const struct kernel_param *kp) 250bdaeedc1SMike Christie { 251bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 252bdaeedc1SMike Christie "blocked" : "unblocked"); 253bdaeedc1SMike Christie } 254bdaeedc1SMike Christie 255bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 256bdaeedc1SMike Christie const struct kernel_param *kp) 257bdaeedc1SMike Christie { 258bdaeedc1SMike Christie int ret; 259bdaeedc1SMike Christie u8 val; 260bdaeedc1SMike Christie 261bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 262bdaeedc1SMike Christie if (ret < 0) 263bdaeedc1SMike Christie return ret; 264bdaeedc1SMike Christie 265bdaeedc1SMike Christie if (val > 1) { 266bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 267bdaeedc1SMike Christie return -EINVAL; 268bdaeedc1SMike Christie } 269bdaeedc1SMike Christie 270bdaeedc1SMike Christie tcmu_netlink_blocked = val; 271bdaeedc1SMike Christie return 0; 272bdaeedc1SMike Christie } 273bdaeedc1SMike Christie 274bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 275bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 276bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 277bdaeedc1SMike Christie }; 278bdaeedc1SMike Christie 279bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 280bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 281bdaeedc1SMike Christie 282bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 283bdaeedc1SMike Christie { 284bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 285bdaeedc1SMike Christie 286bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 287bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 288bdaeedc1SMike Christie return -EBUSY; 289bdaeedc1SMike Christie } 290bdaeedc1SMike Christie 291bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 292bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 293bdaeedc1SMike Christie nl_cmd->status = -EINTR; 294bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 295bdaeedc1SMike Christie complete(&nl_cmd->complete); 296bdaeedc1SMike Christie } 297bdaeedc1SMike Christie return 0; 298bdaeedc1SMike Christie } 299bdaeedc1SMike Christie 300bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 301bdaeedc1SMike Christie const struct kernel_param *kp) 302bdaeedc1SMike Christie { 303bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 304bdaeedc1SMike Christie int ret; 305bdaeedc1SMike Christie u8 val; 306bdaeedc1SMike Christie 307bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 308bdaeedc1SMike Christie if (ret < 0) 309bdaeedc1SMike Christie return ret; 310bdaeedc1SMike Christie 311bdaeedc1SMike Christie if (val != 1) { 312bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 313bdaeedc1SMike Christie return -EINVAL; 314bdaeedc1SMike Christie } 315bdaeedc1SMike Christie 316bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 317bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 318bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 319bdaeedc1SMike Christie if (ret) 320bdaeedc1SMike Christie break; 321bdaeedc1SMike Christie } 322bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 323bdaeedc1SMike Christie 324bdaeedc1SMike Christie return ret; 325bdaeedc1SMike Christie } 326bdaeedc1SMike Christie 327bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 328bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 329bdaeedc1SMike Christie }; 330bdaeedc1SMike Christie 331bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 332bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 333bdaeedc1SMike Christie 3347c9e7a6fSAndy Grover /* multicast group */ 3357c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3367c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3377c9e7a6fSAndy Grover }; 3387c9e7a6fSAndy Grover 3397c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3407c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3417c9e7a6fSAndy Grover }; 3427c9e7a6fSAndy Grover 343b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 344b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 345b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 346b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 347b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 348b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 349b3af66e2SMike Christie }; 350b3af66e2SMike Christie 351b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 352b3af66e2SMike Christie { 3533228691fSMike Christie struct tcmu_dev *udev = NULL; 354b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 355b3af66e2SMike Christie int dev_id, rc, ret = 0; 356b3af66e2SMike Christie 357b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 358b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 359b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 360b3af66e2SMike Christie return -EINVAL; 361b3af66e2SMike Christie } 362b3af66e2SMike Christie 363b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 364b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 365b3af66e2SMike Christie 3663228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3673228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3683228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3693228691fSMike Christie udev = nl_cmd->udev; 3703228691fSMike Christie break; 371b3af66e2SMike Christie } 3723228691fSMike Christie } 373b3af66e2SMike Christie 3743228691fSMike Christie if (!udev) { 3750c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3763228691fSMike Christie completed_cmd, rc, dev_id); 3773228691fSMike Christie ret = -ENODEV; 3783228691fSMike Christie goto unlock; 3793228691fSMike Christie } 3803228691fSMike Christie list_del(&nl_cmd->nl_list); 381b3af66e2SMike Christie 382bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 383bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 384bdaeedc1SMike Christie nl_cmd->status); 385b3af66e2SMike Christie 386b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 3873228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 3883228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 389b3af66e2SMike Christie ret = -EINVAL; 3903228691fSMike Christie goto unlock; 391b3af66e2SMike Christie } 392b3af66e2SMike Christie 3933228691fSMike Christie nl_cmd->status = rc; 394b3af66e2SMike Christie complete(&nl_cmd->complete); 3953228691fSMike Christie unlock: 3963228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 397b3af66e2SMike Christie return ret; 398b3af66e2SMike Christie } 399b3af66e2SMike Christie 400b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 401b3af66e2SMike Christie { 402b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 403b3af66e2SMike Christie } 404b3af66e2SMike Christie 405b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 406b3af66e2SMike Christie { 407b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 408b3af66e2SMike Christie } 409b3af66e2SMike Christie 410b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 411b3af66e2SMike Christie struct genl_info *info) 412b3af66e2SMike Christie { 413b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 414b3af66e2SMike Christie } 415b3af66e2SMike Christie 416b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 417b3af66e2SMike Christie { 418b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 419b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 420b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 421b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 422b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 423b3af66e2SMike Christie } 424b3af66e2SMike Christie 425b3af66e2SMike Christie return 0; 426b3af66e2SMike Christie } 427b3af66e2SMike Christie 428b3af66e2SMike Christie static const struct genl_ops tcmu_genl_ops[] = { 429b3af66e2SMike Christie { 430b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 431ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 432b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 433b3af66e2SMike Christie .doit = tcmu_genl_set_features, 434b3af66e2SMike Christie }, 435b3af66e2SMike Christie { 436b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 437ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 438b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 439b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 440b3af66e2SMike Christie }, 441b3af66e2SMike Christie { 442b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 443ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 444b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 445b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 446b3af66e2SMike Christie }, 447b3af66e2SMike Christie { 448b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 449ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 450b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 451b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 452b3af66e2SMike Christie }, 453b3af66e2SMike Christie }; 454b3af66e2SMike Christie 4557c9e7a6fSAndy Grover /* Our generic netlink family */ 45656989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 457489111e5SJohannes Berg .module = THIS_MODULE, 4587c9e7a6fSAndy Grover .hdrsize = 0, 4597c9e7a6fSAndy Grover .name = "TCM-USER", 460b3af66e2SMike Christie .version = 2, 4617c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4623b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4637c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4647c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 46520c08b36SSheng Yang .netnsok = true, 466b3af66e2SMike Christie .ops = tcmu_genl_ops, 467b3af66e2SMike Christie .n_ops = ARRAY_SIZE(tcmu_genl_ops), 4687c9e7a6fSAndy Grover }; 4697c9e7a6fSAndy Grover 470141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 471141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 472141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 473141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 474141685a3SXiubo Li 475b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 476141685a3SXiubo Li { 477141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 478141685a3SXiubo Li uint32_t i; 479141685a3SXiubo Li 480b6df4b79SXiubo Li for (i = 0; i < len; i++) 481141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 482141685a3SXiubo Li } 483141685a3SXiubo Li 484b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 485b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 486141685a3SXiubo Li { 487b6df4b79SXiubo Li struct page *page; 488b6df4b79SXiubo Li int ret, dbi; 489141685a3SXiubo Li 490b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 491b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 492b6df4b79SXiubo Li return false; 493b6df4b79SXiubo Li 494b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 495b6df4b79SXiubo Li if (!page) { 496b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 49780eb8761SMike Christie tcmu_global_max_blocks) 498af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 499b6df4b79SXiubo Li 500b6df4b79SXiubo Li /* try to get new page from the mm */ 5010eccce86SDamien Le Moal page = alloc_page(GFP_NOIO); 502b6df4b79SXiubo Li if (!page) 503daf78c30SXiubo Li goto err_alloc; 504b6df4b79SXiubo Li 505b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 506daf78c30SXiubo Li if (ret) 507daf78c30SXiubo Li goto err_insert; 508b6df4b79SXiubo Li } 509b6df4b79SXiubo Li 510141685a3SXiubo Li if (dbi > udev->dbi_max) 511141685a3SXiubo Li udev->dbi_max = dbi; 512141685a3SXiubo Li 513141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 514b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 515141685a3SXiubo Li 516b6df4b79SXiubo Li return true; 517daf78c30SXiubo Li err_insert: 518daf78c30SXiubo Li __free_page(page); 519daf78c30SXiubo Li err_alloc: 520daf78c30SXiubo Li atomic_dec(&global_db_count); 521daf78c30SXiubo Li return false; 522141685a3SXiubo Li } 523141685a3SXiubo Li 524b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 525b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 526b6df4b79SXiubo Li { 527b6df4b79SXiubo Li int i; 528b6df4b79SXiubo Li 529b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 530b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 531af1dd7ffSMike Christie return false; 532141685a3SXiubo Li } 533b6df4b79SXiubo Li return true; 534141685a3SXiubo Li } 535141685a3SXiubo Li 536b6df4b79SXiubo Li static inline struct page * 537b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 538141685a3SXiubo Li { 539141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 540141685a3SXiubo Li } 541141685a3SXiubo Li 542141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 543141685a3SXiubo Li { 544141685a3SXiubo Li kfree(tcmu_cmd->dbi); 545141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 546141685a3SXiubo Li } 547141685a3SXiubo Li 548141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 549141685a3SXiubo Li { 550141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 551141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 552141685a3SXiubo Li 553141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 554141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 555141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 556141685a3SXiubo Li DATA_BLOCK_SIZE); 557141685a3SXiubo Li } 558141685a3SXiubo Li 559141685a3SXiubo Li return data_length; 560141685a3SXiubo Li } 561141685a3SXiubo Li 562141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 563141685a3SXiubo Li { 564141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 565141685a3SXiubo Li 566141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 567141685a3SXiubo Li } 568141685a3SXiubo Li 5697c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 5707c9e7a6fSAndy Grover { 5717c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5727c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5737c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5747c9e7a6fSAndy Grover 5750eccce86SDamien Le Moal tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); 5767c9e7a6fSAndy Grover if (!tcmu_cmd) 5777c9e7a6fSAndy Grover return NULL; 5787c9e7a6fSAndy Grover 579a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 5807c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 5817c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 5827c9e7a6fSAndy Grover 583141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 584141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 585141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 5860eccce86SDamien Le Moal GFP_NOIO); 587141685a3SXiubo Li if (!tcmu_cmd->dbi) { 588141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 589141685a3SXiubo Li return NULL; 590141685a3SXiubo Li } 591141685a3SXiubo Li 5927c9e7a6fSAndy Grover return tcmu_cmd; 5937c9e7a6fSAndy Grover } 5947c9e7a6fSAndy Grover 5957c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 5967c9e7a6fSAndy Grover { 597b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 59826d2b310Stangwenji void *start = vaddr - offset; 5997c9e7a6fSAndy Grover 6007c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6017c9e7a6fSAndy Grover 6027c9e7a6fSAndy Grover while (size) { 60326d2b310Stangwenji flush_dcache_page(virt_to_page(start)); 60426d2b310Stangwenji start += PAGE_SIZE; 6057c9e7a6fSAndy Grover size -= PAGE_SIZE; 6067c9e7a6fSAndy Grover } 6077c9e7a6fSAndy Grover } 6087c9e7a6fSAndy Grover 6097c9e7a6fSAndy Grover /* 6107c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6117c9e7a6fSAndy Grover * we can't use circ_buf.h. 6127c9e7a6fSAndy Grover */ 6137c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6147c9e7a6fSAndy Grover { 6157c9e7a6fSAndy Grover int diff = head - tail; 6167c9e7a6fSAndy Grover 6177c9e7a6fSAndy Grover if (diff >= 0) 6187c9e7a6fSAndy Grover return diff; 6197c9e7a6fSAndy Grover else 6207c9e7a6fSAndy Grover return size + diff; 6217c9e7a6fSAndy Grover } 6227c9e7a6fSAndy Grover 6237c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6247c9e7a6fSAndy Grover { 6257c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6267c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6277c9e7a6fSAndy Grover } 6287c9e7a6fSAndy Grover 6297c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6307c9e7a6fSAndy Grover { 6317c9e7a6fSAndy Grover return size - head; 6327c9e7a6fSAndy Grover } 6337c9e7a6fSAndy Grover 6343e609135SXiubo Li static inline void new_iov(struct iovec **iov, int *iov_cnt) 635f1dbd087SSheng Yang { 636f1dbd087SSheng Yang struct iovec *iovec; 637f1dbd087SSheng Yang 638f1dbd087SSheng Yang if (*iov_cnt != 0) 639f1dbd087SSheng Yang (*iov)++; 640f1dbd087SSheng Yang (*iov_cnt)++; 641f1dbd087SSheng Yang 642f1dbd087SSheng Yang iovec = *iov; 643f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 644f1dbd087SSheng Yang } 645f1dbd087SSheng Yang 6467c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6477c9e7a6fSAndy Grover 64826418649SSheng Yang /* offset is relative to mb_addr */ 649141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 650141685a3SXiubo Li int dbi, int remaining) 65126418649SSheng Yang { 652141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 65326418649SSheng Yang DATA_BLOCK_SIZE - remaining; 65426418649SSheng Yang } 65526418649SSheng Yang 656daf78c30SXiubo Li static inline size_t iov_tail(struct iovec *iov) 65726418649SSheng Yang { 65826418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 65926418649SSheng Yang } 66026418649SSheng Yang 6611a1fc0b8SMike Christie static void scatter_data_area(struct tcmu_dev *udev, 662141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 663141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 664141685a3SXiubo Li int *iov_cnt, bool copy_data) 665f97ec7dbSIlias Tsitsimpis { 666141685a3SXiubo Li int i, dbi; 66726418649SSheng Yang int block_remaining = 0; 668141685a3SXiubo Li void *from, *to = NULL; 669141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 670f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 671b6df4b79SXiubo Li struct page *page; 672f97ec7dbSIlias Tsitsimpis 673f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 67426418649SSheng Yang int sg_remaining = sg->length; 675f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 67626418649SSheng Yang while (sg_remaining > 0) { 67726418649SSheng Yang if (block_remaining == 0) { 6783c58f737SBodo Stroesser if (to) { 6793c58f737SBodo Stroesser flush_dcache_page(page); 680b6df4b79SXiubo Li kunmap_atomic(to); 6813c58f737SBodo Stroesser } 682b6df4b79SXiubo Li 68326418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 684b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 685b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 686b6df4b79SXiubo Li to = kmap_atomic(page); 687141685a3SXiubo Li } 688141685a3SXiubo Li 6893e609135SXiubo Li /* 6903e609135SXiubo Li * Covert to virtual offset of the ring data area. 6913e609135SXiubo Li */ 692141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 69326418649SSheng Yang block_remaining); 694141685a3SXiubo Li 6953e609135SXiubo Li /* 6963e609135SXiubo Li * The following code will gather and map the blocks 6973e609135SXiubo Li * to the same iovec when the blocks are all next to 6983e609135SXiubo Li * each other. 6993e609135SXiubo Li */ 7003e609135SXiubo Li copy_bytes = min_t(size_t, sg_remaining, 7013e609135SXiubo Li block_remaining); 70226418649SSheng Yang if (*iov_cnt != 0 && 703daf78c30SXiubo Li to_offset == iov_tail(*iov)) { 7043e609135SXiubo Li /* 7053e609135SXiubo Li * Will append to the current iovec, because 7063e609135SXiubo Li * the current block page is next to the 7073e609135SXiubo Li * previous one. 7083e609135SXiubo Li */ 709f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 71026418649SSheng Yang } else { 7113e609135SXiubo Li /* 7123e609135SXiubo Li * Will allocate a new iovec because we are 7133e609135SXiubo Li * first time here or the current block page 7143e609135SXiubo Li * is not next to the previous one. 7153e609135SXiubo Li */ 7163e609135SXiubo Li new_iov(iov, iov_cnt); 71726418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 718f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 71926418649SSheng Yang } 7203e609135SXiubo Li 721f97ec7dbSIlias Tsitsimpis if (copy_data) { 722c542942cSXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 723c542942cSXiubo Li memcpy(to + offset, 724c542942cSXiubo Li from + sg->length - sg_remaining, 72526418649SSheng Yang copy_bytes); 726f97ec7dbSIlias Tsitsimpis } 7273e609135SXiubo Li 72826418649SSheng Yang sg_remaining -= copy_bytes; 72926418649SSheng Yang block_remaining -= copy_bytes; 730f97ec7dbSIlias Tsitsimpis } 731e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 732f97ec7dbSIlias Tsitsimpis } 7333e609135SXiubo Li 7343c58f737SBodo Stroesser if (to) { 7353c58f737SBodo Stroesser flush_dcache_page(page); 736b6df4b79SXiubo Li kunmap_atomic(to); 7370c28481fSSheng Yang } 7383c58f737SBodo Stroesser } 7390c28481fSSheng Yang 740a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 7416c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 742f97ec7dbSIlias Tsitsimpis { 743a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 744141685a3SXiubo Li int i, dbi; 74526418649SSheng Yang int block_remaining = 0; 746b6df4b79SXiubo Li void *from = NULL, *to; 747141685a3SXiubo Li size_t copy_bytes, offset; 748a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 749b6df4b79SXiubo Li struct page *page; 750a5d68ba8SXiubo Li unsigned int data_nents; 751141685a3SXiubo Li uint32_t count = 0; 752a5d68ba8SXiubo Li 753a5d68ba8SXiubo Li if (!bidi) { 754a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 755a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 756a5d68ba8SXiubo Li } else { 757a5d68ba8SXiubo Li 758a5d68ba8SXiubo Li /* 759a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 760a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 761a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 762a5d68ba8SXiubo Li */ 763a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 764a5d68ba8SXiubo Li 765a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 766a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 767a5d68ba8SXiubo Li } 768f97ec7dbSIlias Tsitsimpis 769141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 770141685a3SXiubo Li 771f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 77226418649SSheng Yang int sg_remaining = sg->length; 773f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 7746c3796d1Sbstroesser@ts.fujitsu.com while (sg_remaining > 0 && read_len > 0) { 77526418649SSheng Yang if (block_remaining == 0) { 776b6df4b79SXiubo Li if (from) 777b6df4b79SXiubo Li kunmap_atomic(from); 778b6df4b79SXiubo Li 77926418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 780141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 781b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 782b6df4b79SXiubo Li from = kmap_atomic(page); 7833c58f737SBodo Stroesser flush_dcache_page(page); 78426418649SSheng Yang } 78526418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 78626418649SSheng Yang block_remaining); 7876c3796d1Sbstroesser@ts.fujitsu.com if (read_len < copy_bytes) 7886c3796d1Sbstroesser@ts.fujitsu.com copy_bytes = read_len; 789141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 790c542942cSXiubo Li memcpy(to + sg->length - sg_remaining, from + offset, 79126418649SSheng Yang copy_bytes); 792f97ec7dbSIlias Tsitsimpis 79326418649SSheng Yang sg_remaining -= copy_bytes; 79426418649SSheng Yang block_remaining -= copy_bytes; 7956c3796d1Sbstroesser@ts.fujitsu.com read_len -= copy_bytes; 796f97ec7dbSIlias Tsitsimpis } 797e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 7986c3796d1Sbstroesser@ts.fujitsu.com if (read_len == 0) 7996c3796d1Sbstroesser@ts.fujitsu.com break; 800f97ec7dbSIlias Tsitsimpis } 801b6df4b79SXiubo Li if (from) 802b6df4b79SXiubo Li kunmap_atomic(from); 803f97ec7dbSIlias Tsitsimpis } 804f97ec7dbSIlias Tsitsimpis 805b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 80626418649SSheng Yang { 8073c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 80826418649SSheng Yang } 80926418649SSheng Yang 8107c9e7a6fSAndy Grover /* 811f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 8123d9b9555SAndy Grover * space available on the data area. 8137c9e7a6fSAndy Grover * 8147c9e7a6fSAndy Grover * Called with ring lock held. 8157c9e7a6fSAndy Grover */ 816b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 817b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 8187c9e7a6fSAndy Grover { 8197c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 820b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 821b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 8220241fd39SNicholas Bellinger size_t space, cmd_needed; 8237c9e7a6fSAndy Grover u32 cmd_head; 8247c9e7a6fSAndy Grover 8257c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8267c9e7a6fSAndy Grover 8277c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8287c9e7a6fSAndy Grover 829f56574a2SAndy Grover /* 830f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 831f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 832f56574a2SAndy Grover */ 833f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 834f56574a2SAndy Grover cmd_needed = cmd_size; 835f56574a2SAndy Grover else 836f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 837f56574a2SAndy Grover 8387c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8397c9e7a6fSAndy Grover if (space < cmd_needed) { 8407c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8417c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8427c9e7a6fSAndy Grover return false; 8437c9e7a6fSAndy Grover } 8447c9e7a6fSAndy Grover 845b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 846b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 8473c0f26ffSMike Christie if ((space * DATA_BLOCK_SIZE) < data_needed) { 84880eb8761SMike Christie unsigned long blocks_left = 84980eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 850b6df4b79SXiubo Li 851b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 852b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 853b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 854b6df4b79SXiubo Li data_needed); 8557c9e7a6fSAndy Grover return false; 8567c9e7a6fSAndy Grover } 8577c9e7a6fSAndy Grover 858f890f579SMike Christie udev->dbi_thresh += blocks_needed; 85980eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 86080eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 861b6df4b79SXiubo Li } 862b6df4b79SXiubo Li 863daf78c30SXiubo Li return tcmu_get_empty_blocks(udev, cmd); 8647c9e7a6fSAndy Grover } 8657c9e7a6fSAndy Grover 866fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 867fe25cc34SXiubo Li { 868fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 869fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 870fe25cc34SXiubo Li } 871fe25cc34SXiubo Li 872fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 873fe25cc34SXiubo Li size_t base_command_size) 874fe25cc34SXiubo Li { 875fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 876fe25cc34SXiubo Li size_t command_size; 877fe25cc34SXiubo Li 878fe25cc34SXiubo Li command_size = base_command_size + 879fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 880fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 881fe25cc34SXiubo Li 882fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 883fe25cc34SXiubo Li 884fe25cc34SXiubo Li return command_size; 885fe25cc34SXiubo Li } 886fe25cc34SXiubo Li 88761fb2482SBodo Stroesser static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8889103575aSMike Christie struct timer_list *timer) 8890d44374cSMike Christie { 8909103575aSMike Christie if (!tmo) 89161fb2482SBodo Stroesser return; 8929103575aSMike Christie 8930d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 894a94a2572SXiubo Li if (!timer_pending(timer)) 8959103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 896a94a2572SXiubo Li 89761fb2482SBodo Stroesser pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, 89861fb2482SBodo Stroesser tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); 8990d44374cSMike Christie } 9000d44374cSMike Christie 901a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 902af1dd7ffSMike Christie { 903af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9049103575aSMike Christie unsigned int tmo; 905af1dd7ffSMike Christie 9069103575aSMike Christie /* 9079103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9089103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9099103575aSMike Christie */ 9109103575aSMike Christie if (!udev->qfull_time_out) 9119103575aSMike Christie return -ETIMEDOUT; 9129103575aSMike Christie else if (udev->qfull_time_out > 0) 9139103575aSMike Christie tmo = udev->qfull_time_out; 9149103575aSMike Christie else if (udev->cmd_time_out) 9159103575aSMike Christie tmo = udev->cmd_time_out; 9169103575aSMike Christie else 9179103575aSMike Christie tmo = TCMU_TIME_OUT; 9189103575aSMike Christie 91961fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 920af1dd7ffSMike Christie 921a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 92261fb2482SBodo Stroesser pr_debug("adding cmd %p on dev %s to ring space wait queue\n", 92361fb2482SBodo Stroesser tcmu_cmd, udev->name); 924af1dd7ffSMike Christie return 0; 925af1dd7ffSMike Christie } 926af1dd7ffSMike Christie 9276fd0ce79SMike Christie /** 9286fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9296fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9306fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9316fd0ce79SMike Christie * 9326fd0ce79SMike Christie * Returns: 9336fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9346fd0ce79SMike Christie * 0 success 935af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9366fd0ce79SMike Christie */ 937e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9387c9e7a6fSAndy Grover { 9397c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9407c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9417c9e7a6fSAndy Grover size_t base_command_size, command_size; 9427c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 9437c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 9447c9e7a6fSAndy Grover struct iovec *iov; 94561fb2482SBodo Stroesser int iov_cnt, cmd_id; 9467c9e7a6fSAndy Grover uint32_t cmd_head; 9477c9e7a6fSAndy Grover uint64_t cdb_off; 948f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 949ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 9507c9e7a6fSAndy Grover 9516fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 9526fd0ce79SMike Christie 953892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 954892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 955892782caSMike Christie return -1; 956892782caSMike Christie } 957892782caSMike Christie 9586fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 9596fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 9606fd0ce79SMike Christie return -1; 9616fd0ce79SMike Christie } 9627c9e7a6fSAndy Grover 9637c9e7a6fSAndy Grover /* 9647c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 9657c9e7a6fSAndy Grover * also may be larger if the iov array is large. 9667c9e7a6fSAndy Grover * 967fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 968fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 969fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 970fe25cc34SXiubo Li * will only be used to do the checks. 971fe25cc34SXiubo Li * 972fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 973fe25cc34SXiubo Li * cmd area memories. 9747c9e7a6fSAndy Grover */ 975fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 976fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 9777c9e7a6fSAndy Grover 978a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 979af1dd7ffSMike Christie goto queue; 9807c9e7a6fSAndy Grover 9817c9e7a6fSAndy Grover mb = udev->mb_addr; 9827c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 983554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 984554617b2SAndy Grover data_length > udev->data_size) { 985554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 9863d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 9877c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 9886fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 9896fd0ce79SMike Christie return -1; 990554617b2SAndy Grover } 9917c9e7a6fSAndy Grover 992af1dd7ffSMike Christie if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 993810b8153SMike Christie /* 994810b8153SMike Christie * Don't leave commands partially setup because the unmap 995810b8153SMike Christie * thread might need the blocks to make forward progress. 996810b8153SMike Christie */ 997810b8153SMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 998810b8153SMike Christie tcmu_cmd_reset_dbi_cur(tcmu_cmd); 999af1dd7ffSMike Christie goto queue; 10007c9e7a6fSAndy Grover } 10017c9e7a6fSAndy Grover 1002f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 1003f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 1004f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 1005f56574a2SAndy Grover 10067c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 10070ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 10080ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 10090ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 10100ad46af8SAndy Grover entry->hdr.kflags = 0; 10110ad46af8SAndy Grover entry->hdr.uflags = 0; 10128c4e0f21SBodo Stroesser tcmu_flush_dcache_range(entry, sizeof(entry->hdr)); 10137c9e7a6fSAndy Grover 10147c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 10159d62bc0eSXiubo Li tcmu_flush_dcache_range(mb, sizeof(*mb)); 10167c9e7a6fSAndy Grover 10177c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 10187c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 10197c9e7a6fSAndy Grover } 10207c9e7a6fSAndy Grover 10217c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 1022b3743c71SXiubo Li memset(entry, 0, command_size); 10230ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10247c9e7a6fSAndy Grover 10253d9b9555SAndy Grover /* Handle allocating space from the data area */ 1026b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10277c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 1028f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 1029e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 1030e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 10311a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 1032b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 1033b6df4b79SXiubo Li copy_to_data_area); 10347c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 10357c9e7a6fSAndy Grover 1036e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 1037e4648b01SIlias Tsitsimpis iov_cnt = 0; 1038b3743c71SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 1039ab22d260SXiubo Li iov++; 10401a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, 10411a1fc0b8SMike Christie se_cmd->t_bidi_data_nents, &iov, &iov_cnt, 10421a1fc0b8SMike Christie false); 1043ab22d260SXiubo Li } 1044b3743c71SXiubo Li entry->req.iov_bidi_cnt = iov_cnt; 104526418649SSheng Yang 104661fb2482SBodo Stroesser cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 104761fb2482SBodo Stroesser if (cmd_id < 0) { 104861fb2482SBodo Stroesser pr_err("tcmu: Could not allocate cmd id.\n"); 10496fd0ce79SMike Christie 105061fb2482SBodo Stroesser tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10516fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10526fd0ce79SMike Christie return -1; 10530d44374cSMike Christie } 105461fb2482SBodo Stroesser tcmu_cmd->cmd_id = cmd_id; 105561fb2482SBodo Stroesser 105661fb2482SBodo Stroesser pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, 105761fb2482SBodo Stroesser tcmu_cmd, udev->name); 105861fb2482SBodo Stroesser 105961fb2482SBodo Stroesser tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); 106061fb2482SBodo Stroesser 10610d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10620d44374cSMike Christie 1063fe25cc34SXiubo Li /* 1064fe25cc34SXiubo Li * Recalaulate the command's base size and size according 1065fe25cc34SXiubo Li * to the actual needs 1066fe25cc34SXiubo Li */ 1067fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 1068fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 1069fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 1070fe25cc34SXiubo Li 1071fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1072fe25cc34SXiubo Li 10737c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 10747c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 10757c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 10767c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 10778c4e0f21SBodo Stroesser tcmu_flush_dcache_range(entry, command_size); 10787c9e7a6fSAndy Grover 10797c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 10807c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10817c9e7a6fSAndy Grover 1082a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1083a94a2572SXiubo Li 10847c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 10857c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 10867c9e7a6fSAndy Grover 10876fd0ce79SMike Christie return 0; 1088af1dd7ffSMike Christie 1089af1dd7ffSMike Christie queue: 1090a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1091af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1092af1dd7ffSMike Christie return -1; 1093af1dd7ffSMike Christie } 1094af1dd7ffSMike Christie 1095af1dd7ffSMike Christie return 1; 10967c9e7a6fSAndy Grover } 10977c9e7a6fSAndy Grover 109802eb924fSAndy Grover static sense_reason_t 109902eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11007c9e7a6fSAndy Grover { 1101af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1102af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11037c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 11046fd0ce79SMike Christie sense_reason_t scsi_ret; 1105af1dd7ffSMike Christie int ret; 11067c9e7a6fSAndy Grover 11077c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11087c9e7a6fSAndy Grover if (!tcmu_cmd) 110902eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11107c9e7a6fSAndy Grover 1111af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1112af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1113af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 1114af1dd7ffSMike Christie if (ret < 0) 1115141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 11166fd0ce79SMike Christie return scsi_ret; 11177c9e7a6fSAndy Grover } 11187c9e7a6fSAndy Grover 11197c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 11207c9e7a6fSAndy Grover { 11217c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 11227c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 11236c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 1124a86a7586SDmitry Fomichev uint32_t read_len; 11257c9e7a6fSAndy Grover 1126b25c7863SSheng Yang /* 1127b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 11283d9b9555SAndy Grover * data area space and free cmd 1129b25c7863SSheng Yang */ 1130a86a7586SDmitry Fomichev if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1131a86a7586SDmitry Fomichev WARN_ON_ONCE(se_cmd); 1132141685a3SXiubo Li goto out; 1133a86a7586SDmitry Fomichev } 1134b25c7863SSheng Yang 1135a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1136a94a2572SXiubo Li 1137141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 11387c9e7a6fSAndy Grover 11390ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 11400ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 11410ad46af8SAndy Grover cmd->se_cmd); 1142ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 11436c3796d1Sbstroesser@ts.fujitsu.com goto done; 11446c3796d1Sbstroesser@ts.fujitsu.com } 11456c3796d1Sbstroesser@ts.fujitsu.com 1146a86a7586SDmitry Fomichev read_len = se_cmd->data_length; 11476c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 11486c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 11496c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 11506c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 11516c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 11526c3796d1Sbstroesser@ts.fujitsu.com } 11536c3796d1Sbstroesser@ts.fujitsu.com 11546c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1155406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 11566c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 11576c3796d1Sbstroesser@ts.fujitsu.com goto done; 11586c3796d1Sbstroesser@ts.fujitsu.com else 11596c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 11606c3796d1Sbstroesser@ts.fujitsu.com } 11616c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 116226418649SSheng Yang /* Get Data-In buffer before clean up */ 11636c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1164e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 11656c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 11667c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1167141685a3SXiubo Li /* TODO: */ 11682bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 11692bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 11702bc396a2SIlias Tsitsimpis se_cmd->data_direction); 11717c9e7a6fSAndy Grover } 11727c9e7a6fSAndy Grover 11736c3796d1Sbstroesser@ts.fujitsu.com done: 11746c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 11756c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 11766c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 11776c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 11786c3796d1Sbstroesser@ts.fujitsu.com } else 11797c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 11807c9e7a6fSAndy Grover 1181141685a3SXiubo Li out: 1182141685a3SXiubo Li cmd->se_cmd = NULL; 1183b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1184141685a3SXiubo Li tcmu_free_cmd(cmd); 11857c9e7a6fSAndy Grover } 11867c9e7a6fSAndy Grover 1187a94a2572SXiubo Li static void tcmu_set_next_deadline(struct list_head *queue, 1188a94a2572SXiubo Li struct timer_list *timer) 1189a94a2572SXiubo Li { 1190a94a2572SXiubo Li struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1191a94a2572SXiubo Li unsigned long deadline = 0; 1192a94a2572SXiubo Li 1193a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, queue, queue_entry) { 1194a94a2572SXiubo Li if (!time_after(jiffies, tcmu_cmd->deadline)) { 1195a94a2572SXiubo Li deadline = tcmu_cmd->deadline; 1196a94a2572SXiubo Li break; 1197a94a2572SXiubo Li } 1198a94a2572SXiubo Li } 1199a94a2572SXiubo Li 1200a94a2572SXiubo Li if (deadline) 1201a94a2572SXiubo Li mod_timer(timer, deadline); 1202a94a2572SXiubo Li else 1203a94a2572SXiubo Li del_timer(timer); 1204a94a2572SXiubo Li } 1205a94a2572SXiubo Li 12067c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 12077c9e7a6fSAndy Grover { 12087c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1209a94a2572SXiubo Li struct tcmu_cmd *cmd; 12107c9e7a6fSAndy Grover int handled = 0; 12117c9e7a6fSAndy Grover 12127c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 12137c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 12147c9e7a6fSAndy Grover return 0; 12157c9e7a6fSAndy Grover } 12167c9e7a6fSAndy Grover 12177c9e7a6fSAndy Grover mb = udev->mb_addr; 12187c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 12197c9e7a6fSAndy Grover 12206aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 12217c9e7a6fSAndy Grover 12227c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 12237c9e7a6fSAndy Grover 12247c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 12257c9e7a6fSAndy Grover 12260ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 12270ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12280ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12290ad46af8SAndy Grover udev->cmdr_size); 12307c9e7a6fSAndy Grover continue; 12317c9e7a6fSAndy Grover } 12320ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 12337c9e7a6fSAndy Grover 1234d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 12357c9e7a6fSAndy Grover if (!cmd) { 123688cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 123788cf1073SMike Christie entry->hdr.cmd_id); 12387c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 12397c9e7a6fSAndy Grover break; 12407c9e7a6fSAndy Grover } 12417c9e7a6fSAndy Grover 12427c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 12437c9e7a6fSAndy Grover 12440ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12450ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12460ad46af8SAndy Grover udev->cmdr_size); 12477c9e7a6fSAndy Grover 12487c9e7a6fSAndy Grover handled++; 12497c9e7a6fSAndy Grover } 12507c9e7a6fSAndy Grover 12519103575aSMike Christie if (mb->cmd_tail == mb->cmd_head) { 12529103575aSMike Christie /* no more pending commands */ 12539103575aSMike Christie del_timer(&udev->cmd_timer); 12549103575aSMike Christie 1255a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) { 1256af1dd7ffSMike Christie /* 12579103575aSMike Christie * no more pending or waiting commands so try to 12589103575aSMike Christie * reclaim blocks if needed. 1259af1dd7ffSMike Christie */ 12609103575aSMike Christie if (atomic_read(&global_db_count) > 126180eb8761SMike Christie tcmu_global_max_blocks) 1262af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1263af1dd7ffSMike Christie } 1264a94a2572SXiubo Li } else if (udev->cmd_time_out) { 1265a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 12669103575aSMike Christie } 12677c9e7a6fSAndy Grover 12687c9e7a6fSAndy Grover return handled; 12697c9e7a6fSAndy Grover } 12707c9e7a6fSAndy Grover 127161fb2482SBodo Stroesser static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) 12727c9e7a6fSAndy Grover { 1273af1dd7ffSMike Christie struct se_cmd *se_cmd; 12747c9e7a6fSAndy Grover 1275611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 127661fb2482SBodo Stroesser return; 12779103575aSMike Christie 1278af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 127940d883b0SXiubo Li list_del_init(&cmd->queue_entry); 128061fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 1281a86a7586SDmitry Fomichev cmd->se_cmd = NULL; 128261fb2482SBodo Stroesser 128361fb2482SBodo Stroesser pr_debug("Timing out inflight cmd %u on dev %s.\n", 128461fb2482SBodo Stroesser cmd->cmd_id, cmd->tcmu_dev->name); 128561fb2482SBodo Stroesser 128661fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); 1287af1dd7ffSMike Christie } 12889103575aSMike Christie 128961fb2482SBodo Stroesser static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) 129061fb2482SBodo Stroesser { 129161fb2482SBodo Stroesser struct se_cmd *se_cmd; 12929103575aSMike Christie 129361fb2482SBodo Stroesser if (!time_after(jiffies, cmd->deadline)) 129461fb2482SBodo Stroesser return; 129561fb2482SBodo Stroesser 12969d7464b1SDan Carpenter pr_debug("Timing out queued cmd %p on dev %s.\n", 12979d7464b1SDan Carpenter cmd, cmd->tcmu_dev->name); 12989d7464b1SDan Carpenter 129961fb2482SBodo Stroesser list_del_init(&cmd->queue_entry); 130061fb2482SBodo Stroesser se_cmd = cmd->se_cmd; 130161fb2482SBodo Stroesser tcmu_free_cmd(cmd); 130261fb2482SBodo Stroesser 130361fb2482SBodo Stroesser target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); 13047c9e7a6fSAndy Grover } 13057c9e7a6fSAndy Grover 13069103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 13077c9e7a6fSAndy Grover { 1308488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1309488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1310488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1311488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 13127c9e7a6fSAndy Grover 1313af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 13147c9e7a6fSAndy Grover } 13157c9e7a6fSAndy Grover 13169103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 13179103575aSMike Christie { 13189103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 13199103575aSMike Christie 13209103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 13219103575aSMike Christie tcmu_device_timedout(udev); 13229103575aSMike Christie } 13239103575aSMike Christie 13249103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 13259103575aSMike Christie { 13269103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 13279103575aSMike Christie 13289103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 13299103575aSMike Christie tcmu_device_timedout(udev); 13309103575aSMike Christie } 13319103575aSMike Christie 13327c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 13337c9e7a6fSAndy Grover { 13347c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 13357c9e7a6fSAndy Grover 13367c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 13377c9e7a6fSAndy Grover if (!tcmu_hba) 13387c9e7a6fSAndy Grover return -ENOMEM; 13397c9e7a6fSAndy Grover 13407c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 13417c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 13427c9e7a6fSAndy Grover 13437c9e7a6fSAndy Grover return 0; 13447c9e7a6fSAndy Grover } 13457c9e7a6fSAndy Grover 13467c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 13477c9e7a6fSAndy Grover { 13487c9e7a6fSAndy Grover kfree(hba->hba_ptr); 13497c9e7a6fSAndy Grover hba->hba_ptr = NULL; 13507c9e7a6fSAndy Grover } 13517c9e7a6fSAndy Grover 13527c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 13537c9e7a6fSAndy Grover { 13547c9e7a6fSAndy Grover struct tcmu_dev *udev; 13557c9e7a6fSAndy Grover 13567c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 13577c9e7a6fSAndy Grover if (!udev) 13587c9e7a6fSAndy Grover return NULL; 1359f3cdbe39SMike Christie kref_init(&udev->kref); 13607c9e7a6fSAndy Grover 13617c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 13627c9e7a6fSAndy Grover if (!udev->name) { 13637c9e7a6fSAndy Grover kfree(udev); 13647c9e7a6fSAndy Grover return NULL; 13657c9e7a6fSAndy Grover } 13667c9e7a6fSAndy Grover 13677c9e7a6fSAndy Grover udev->hba = hba; 1368af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 13699103575aSMike Christie udev->qfull_time_out = -1; 13707c9e7a6fSAndy Grover 137180eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1372b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 13737c9e7a6fSAndy Grover 1374ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1375488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1376a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1377a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 13787c9e7a6fSAndy Grover idr_init(&udev->commands); 13797c9e7a6fSAndy Grover 13809103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 13819103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 13827c9e7a6fSAndy Grover 1383c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1384c22adc0bSXiubo Li 13857c9e7a6fSAndy Grover return &udev->se_dev; 13867c9e7a6fSAndy Grover } 13877c9e7a6fSAndy Grover 138861fb2482SBodo Stroesser static void run_qfull_queue(struct tcmu_dev *udev, bool fail) 1389af1dd7ffSMike Christie { 1390af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1391af1dd7ffSMike Christie LIST_HEAD(cmds); 1392af1dd7ffSMike Christie sense_reason_t scsi_ret; 1393af1dd7ffSMike Christie int ret; 1394af1dd7ffSMike Christie 1395a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 139661fb2482SBodo Stroesser return; 1397af1dd7ffSMike Christie 1398892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1399af1dd7ffSMike Christie 1400a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1401af1dd7ffSMike Christie 1402a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1403a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1404af1dd7ffSMike Christie 140561fb2482SBodo Stroesser pr_debug("removing cmd %p on dev %s from queue\n", 140661fb2482SBodo Stroesser tcmu_cmd, udev->name); 1407af1dd7ffSMike Christie 1408892782caSMike Christie if (fail) { 1409892782caSMike Christie /* 1410892782caSMike Christie * We were not able to even start the command, so 1411892782caSMike Christie * fail with busy to allow a retry in case runner 1412892782caSMike Christie * was only temporarily down. If the device is being 1413892782caSMike Christie * removed then LIO core will do the right thing and 1414892782caSMike Christie * fail the retry. 1415892782caSMike Christie */ 1416892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1417892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1418892782caSMike Christie continue; 1419892782caSMike Christie } 1420892782caSMike Christie 1421af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1422af1dd7ffSMike Christie if (ret < 0) { 142361fb2482SBodo Stroesser pr_debug("cmd %p on dev %s failed with %u\n", 142461fb2482SBodo Stroesser tcmu_cmd, udev->name, scsi_ret); 1425af1dd7ffSMike Christie /* 1426af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1427af1dd7ffSMike Christie * drops it. 1428af1dd7ffSMike Christie */ 1429af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1430af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1431af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1432af1dd7ffSMike Christie } else if (ret > 0) { 1433af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1434af1dd7ffSMike Christie /* 1435af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1436af1dd7ffSMike Christie * the queue 1437af1dd7ffSMike Christie */ 1438a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1439a94a2572SXiubo Li break; 1440af1dd7ffSMike Christie } 1441af1dd7ffSMike Christie } 1442a94a2572SXiubo Li 1443a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1444af1dd7ffSMike Christie } 1445af1dd7ffSMike Christie 14467c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 14477c9e7a6fSAndy Grover { 1448af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14497c9e7a6fSAndy Grover 1450af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1451af1dd7ffSMike Christie tcmu_handle_completions(udev); 1452a94a2572SXiubo Li run_qfull_queue(udev, false); 1453af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 14547c9e7a6fSAndy Grover 14557c9e7a6fSAndy Grover return 0; 14567c9e7a6fSAndy Grover } 14577c9e7a6fSAndy Grover 14587c9e7a6fSAndy Grover /* 14597c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 14607c9e7a6fSAndy Grover * and this stuff must come along. 14617c9e7a6fSAndy Grover */ 14627c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 14637c9e7a6fSAndy Grover { 14647c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 14657c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 14667c9e7a6fSAndy Grover 14677c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 14687c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 14697c9e7a6fSAndy Grover return -1; 14707c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 14717c9e7a6fSAndy Grover } 14727c9e7a6fSAndy Grover return -1; 14737c9e7a6fSAndy Grover } 14747c9e7a6fSAndy Grover 1475b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1476b6df4b79SXiubo Li { 1477b6df4b79SXiubo Li struct page *page; 1478b6df4b79SXiubo Li 1479b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1480b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1481b6df4b79SXiubo Li if (likely(page)) { 1482b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1483b6df4b79SXiubo Li return page; 1484b6df4b79SXiubo Li } 1485b6df4b79SXiubo Li 1486b6df4b79SXiubo Li /* 1487c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1488c1c390baSMike Christie * data iov passed to it. 1489b6df4b79SXiubo Li */ 1490c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1491c1c390baSMike Christie dbi, udev->name); 1492c1c390baSMike Christie page = NULL; 1493b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1494b6df4b79SXiubo Li 1495b6df4b79SXiubo Li return page; 1496b6df4b79SXiubo Li } 1497b6df4b79SXiubo Li 149869589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 14997c9e7a6fSAndy Grover { 150011bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 15017c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 15027c9e7a6fSAndy Grover struct page *page; 15037c9e7a6fSAndy Grover unsigned long offset; 15047c9e7a6fSAndy Grover void *addr; 15057c9e7a6fSAndy Grover 150611bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 15077c9e7a6fSAndy Grover if (mi < 0) 15087c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 15097c9e7a6fSAndy Grover 15107c9e7a6fSAndy Grover /* 15117c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 15127c9e7a6fSAndy Grover * to use mem[N]. 15137c9e7a6fSAndy Grover */ 15147c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 15157c9e7a6fSAndy Grover 1516141685a3SXiubo Li if (offset < udev->data_off) { 1517141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 15187c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 15197c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1520141685a3SXiubo Li } else { 1521141685a3SXiubo Li uint32_t dbi; 1522141685a3SXiubo Li 1523b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1524141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1525b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1526b6df4b79SXiubo Li if (!page) 1527c1c390baSMike Christie return VM_FAULT_SIGBUS; 1528141685a3SXiubo Li } 1529141685a3SXiubo Li 15307c9e7a6fSAndy Grover get_page(page); 15317c9e7a6fSAndy Grover vmf->page = page; 15327c9e7a6fSAndy Grover return 0; 15337c9e7a6fSAndy Grover } 15347c9e7a6fSAndy Grover 15357c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 15367c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 15377c9e7a6fSAndy Grover }; 15387c9e7a6fSAndy Grover 15397c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 15407c9e7a6fSAndy Grover { 15417c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15427c9e7a6fSAndy Grover 15437c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 15447c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 15457c9e7a6fSAndy Grover 15467c9e7a6fSAndy Grover vma->vm_private_data = udev; 15477c9e7a6fSAndy Grover 15487c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 154980eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 15507c9e7a6fSAndy Grover return -EINVAL; 15517c9e7a6fSAndy Grover 15527c9e7a6fSAndy Grover return 0; 15537c9e7a6fSAndy Grover } 15547c9e7a6fSAndy Grover 15557c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 15567c9e7a6fSAndy Grover { 15577c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15587c9e7a6fSAndy Grover 15597c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 15607c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 15617c9e7a6fSAndy Grover return -EBUSY; 15627c9e7a6fSAndy Grover 1563b6df4b79SXiubo Li udev->inode = inode; 15649260695dSMike Christie kref_get(&udev->kref); 1565b6df4b79SXiubo Li 15667c9e7a6fSAndy Grover pr_debug("open\n"); 15677c9e7a6fSAndy Grover 15687c9e7a6fSAndy Grover return 0; 15697c9e7a6fSAndy Grover } 15707c9e7a6fSAndy Grover 1571f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1572f3cdbe39SMike Christie { 1573f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1574f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1575f3cdbe39SMike Christie 1576f3cdbe39SMike Christie kfree(udev->uio_info.name); 1577f3cdbe39SMike Christie kfree(udev->name); 1578f3cdbe39SMike Christie kfree(udev); 1579f3cdbe39SMike Christie } 1580f3cdbe39SMike Christie 1581c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1582c22adc0bSXiubo Li { 1583c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1584c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1585c22adc0bSXiubo Li return 0; 1586c22adc0bSXiubo Li } 1587c22adc0bSXiubo Li return -EINVAL; 1588c22adc0bSXiubo Li } 1589c22adc0bSXiubo Li 1590bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1591bf99ec13SMike Christie int start, int end) 1592c22adc0bSXiubo Li { 1593c22adc0bSXiubo Li int i; 1594c22adc0bSXiubo Li struct page *page; 1595c22adc0bSXiubo Li 1596bf99ec13SMike Christie for (i = start; i < end; i++) { 1597bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1598c22adc0bSXiubo Li if (page) { 1599c22adc0bSXiubo Li __free_page(page); 1600c22adc0bSXiubo Li atomic_dec(&global_db_count); 1601c22adc0bSXiubo Li } 1602c22adc0bSXiubo Li } 1603c22adc0bSXiubo Li } 1604c22adc0bSXiubo Li 1605f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1606f3cdbe39SMike Christie { 1607f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1608f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1609c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1610c22adc0bSXiubo Li bool all_expired = true; 1611c22adc0bSXiubo Li int i; 1612c22adc0bSXiubo Li 1613c22adc0bSXiubo Li vfree(udev->mb_addr); 1614c22adc0bSXiubo Li udev->mb_addr = NULL; 1615c22adc0bSXiubo Li 1616488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1617488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1618488ebe4cSMike Christie list_del(&udev->timedout_entry); 1619488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1620488ebe4cSMike Christie 1621c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 16226fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1623c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1624c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1625c22adc0bSXiubo Li all_expired = false; 1626c22adc0bSXiubo Li } 162761fb2482SBodo Stroesser if (!list_empty(&udev->qfull_queue)) 162861fb2482SBodo Stroesser all_expired = false; 1629c22adc0bSXiubo Li idr_destroy(&udev->commands); 1630c22adc0bSXiubo Li WARN_ON(!all_expired); 1631c22adc0bSXiubo Li 1632bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 163398effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 1634bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1635f3cdbe39SMike Christie 1636f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1637f3cdbe39SMike Christie } 1638f3cdbe39SMike Christie 16397c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 16407c9e7a6fSAndy Grover { 16417c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 16427c9e7a6fSAndy Grover 16437c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 16447c9e7a6fSAndy Grover 16457c9e7a6fSAndy Grover pr_debug("close\n"); 16469260695dSMike Christie /* release ref from open */ 1647f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 16487c9e7a6fSAndy Grover return 0; 16497c9e7a6fSAndy Grover } 16507c9e7a6fSAndy Grover 16519de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1652b3af66e2SMike Christie { 1653b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1654b3af66e2SMike Christie 1655b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 16569de3a1efSMike Christie return 0; 1657b849b456SKenjiro Nakayama 1658b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 16599de3a1efSMike Christie return 0; 1660b849b456SKenjiro Nakayama 16613228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1662b3af66e2SMike Christie 1663bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1664bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1665bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1666bdaeedc1SMike Christie udev->name); 1667bdaeedc1SMike Christie return -EAGAIN; 1668bdaeedc1SMike Christie } 1669b3af66e2SMike Christie 1670b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 16713228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 16729de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 16739de3a1efSMike Christie nl_cmd->cmd, udev->name); 16749de3a1efSMike Christie return -EBUSY; 1675b3af66e2SMike Christie } 1676b3af66e2SMike Christie 1677b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1678b3af66e2SMike Christie nl_cmd->cmd = cmd; 16793228691fSMike Christie nl_cmd->udev = udev; 1680b3af66e2SMike Christie init_completion(&nl_cmd->complete); 16813228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1682b3af66e2SMike Christie 16833228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 16843228691fSMike Christie 16853228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 16869de3a1efSMike Christie return 0; 1687b3af66e2SMike Christie } 1688b3af66e2SMike Christie 16897d894862SLi Zhong static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) 16907d894862SLi Zhong { 16917d894862SLi Zhong struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 16927d894862SLi Zhong 16937d894862SLi Zhong if (!tcmu_kern_cmd_reply_supported) 16947d894862SLi Zhong return; 16957d894862SLi Zhong 16967d894862SLi Zhong if (udev->nl_reply_supported <= 0) 16977d894862SLi Zhong return; 16987d894862SLi Zhong 16997d894862SLi Zhong mutex_lock(&tcmu_nl_cmd_mutex); 17007d894862SLi Zhong 17017d894862SLi Zhong list_del(&nl_cmd->nl_list); 17027d894862SLi Zhong memset(nl_cmd, 0, sizeof(*nl_cmd)); 17037d894862SLi Zhong 17047d894862SLi Zhong mutex_unlock(&tcmu_nl_cmd_mutex); 17057d894862SLi Zhong } 17067d894862SLi Zhong 1707b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1708b3af66e2SMike Christie { 1709b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1710b3af66e2SMike Christie int ret; 1711b3af66e2SMike Christie 1712b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1713b3af66e2SMike Christie return 0; 1714b3af66e2SMike Christie 1715b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1716b849b456SKenjiro Nakayama return 0; 1717b849b456SKenjiro Nakayama 1718b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1719b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1720b3af66e2SMike Christie 17213228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1722b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1723b3af66e2SMike Christie ret = nl_cmd->status; 17243228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1725b3af66e2SMike Christie 172685fae482SLuis de Bethencourt return ret; 1727b3af66e2SMike Christie } 1728b3af66e2SMike Christie 17290e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 17300e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 17310e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 17327c9e7a6fSAndy Grover { 17337c9e7a6fSAndy Grover struct sk_buff *skb; 17347c9e7a6fSAndy Grover void *msg_header; 17356e14eab9SNicholas Bellinger int ret = -ENOMEM; 17367c9e7a6fSAndy Grover 17377c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 17387c9e7a6fSAndy Grover if (!skb) 17396e14eab9SNicholas Bellinger return ret; 17407c9e7a6fSAndy Grover 17417c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 17426e14eab9SNicholas Bellinger if (!msg_header) 17436e14eab9SNicholas Bellinger goto free_skb; 17447c9e7a6fSAndy Grover 1745b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 17466e14eab9SNicholas Bellinger if (ret < 0) 17476e14eab9SNicholas Bellinger goto free_skb; 17487c9e7a6fSAndy Grover 1749b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1750b3af66e2SMike Christie if (ret < 0) 1751b3af66e2SMike Christie goto free_skb; 1752b3af66e2SMike Christie 1753b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 17546e14eab9SNicholas Bellinger if (ret < 0) 17556e14eab9SNicholas Bellinger goto free_skb; 17567c9e7a6fSAndy Grover 17570e5aee39SZhu Lingshan *buf = skb; 17580e5aee39SZhu Lingshan *hdr = msg_header; 17590e5aee39SZhu Lingshan return ret; 17600e5aee39SZhu Lingshan 17610e5aee39SZhu Lingshan free_skb: 17620e5aee39SZhu Lingshan nlmsg_free(skb); 17630e5aee39SZhu Lingshan return ret; 17642d76443eSMike Christie } 17652d76443eSMike Christie 17660e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 17670e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 176806add777SMike Christie struct sk_buff *skb, void *msg_header) 17690e5aee39SZhu Lingshan { 177006add777SMike Christie int ret; 17718a45885cSBryant G. Ly 1772053c095aSJohannes Berg genlmsg_end(skb, msg_header); 17737c9e7a6fSAndy Grover 17749de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 17759de3a1efSMike Christie if (ret) { 17769de3a1efSMike Christie nlmsg_free(skb); 17779de3a1efSMike Christie return ret; 17789de3a1efSMike Christie } 1779b3af66e2SMike Christie 178020c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 17817c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 17822ff717cdSCathy Avery 17832ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 17842ff717cdSCathy Avery if (ret == 0 || 17852ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 17862ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 17877d894862SLi Zhong else 17887d894862SLi Zhong tcmu_destroy_genl_cmd_reply(udev); 17892ff717cdSCathy Avery 17900e5aee39SZhu Lingshan return ret; 17910e5aee39SZhu Lingshan } 17927c9e7a6fSAndy Grover 1793e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 1794e0c240acSZhu Lingshan { 1795e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 1796e0c240acSZhu Lingshan void *msg_header = NULL; 1797e0c240acSZhu Lingshan int ret = 0; 1798e0c240acSZhu Lingshan 1799e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 1800e0c240acSZhu Lingshan &msg_header); 1801e0c240acSZhu Lingshan if (ret < 0) 18027c9e7a6fSAndy Grover return ret; 180306add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 180406add777SMike Christie msg_header); 1805e0c240acSZhu Lingshan } 1806e0c240acSZhu Lingshan 1807f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 1808f892bd8eSZhu Lingshan { 1809f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 1810f892bd8eSZhu Lingshan void *msg_header = NULL; 1811f892bd8eSZhu Lingshan int ret = 0; 1812f892bd8eSZhu Lingshan 1813f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 1814f892bd8eSZhu Lingshan &skb, &msg_header); 1815f892bd8eSZhu Lingshan if (ret < 0) 18166e14eab9SNicholas Bellinger return ret; 1817f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 181806add777SMike Christie skb, msg_header); 18197c9e7a6fSAndy Grover } 18207c9e7a6fSAndy Grover 1821de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 18227c9e7a6fSAndy Grover { 18237c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 18247c9e7a6fSAndy Grover struct uio_info *info; 18257c9e7a6fSAndy Grover char *str; 18267c9e7a6fSAndy Grover 18277c9e7a6fSAndy Grover info = &udev->uio_info; 182822c2f35fSChristophe JAILLET 182922c2f35fSChristophe JAILLET if (udev->dev_config[0]) 183022c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, 183122c2f35fSChristophe JAILLET udev->name, udev->dev_config); 183222c2f35fSChristophe JAILLET else 183322c2f35fSChristophe JAILLET str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, 183422c2f35fSChristophe JAILLET udev->name); 18357c9e7a6fSAndy Grover if (!str) 18367c9e7a6fSAndy Grover return -ENOMEM; 18377c9e7a6fSAndy Grover 1838ededd039SBryant G. Ly /* If the old string exists, free it */ 1839ededd039SBryant G. Ly kfree(info->name); 18407c9e7a6fSAndy Grover info->name = str; 18417c9e7a6fSAndy Grover 1842de8c5221SBryant G. Ly return 0; 1843de8c5221SBryant G. Ly } 1844de8c5221SBryant G. Ly 1845de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 1846de8c5221SBryant G. Ly { 1847de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 1848de8c5221SBryant G. Ly struct uio_info *info; 1849de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 1850de8c5221SBryant G. Ly int ret = 0; 1851de8c5221SBryant G. Ly 1852de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1853de8c5221SBryant G. Ly if (ret) 1854de8c5221SBryant G. Ly return ret; 1855de8c5221SBryant G. Ly 1856de8c5221SBryant G. Ly info = &udev->uio_info; 1857de8c5221SBryant G. Ly 1858c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 185998effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 1860c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 1861a24e7917SWei Yongjun if (!udev->data_bitmap) { 1862a24e7917SWei Yongjun ret = -ENOMEM; 186380eb8761SMike Christie goto err_bitmap_alloc; 1864a24e7917SWei Yongjun } 186580eb8761SMike Christie 1866141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 18677c9e7a6fSAndy Grover if (!udev->mb_addr) { 18687c9e7a6fSAndy Grover ret = -ENOMEM; 18697c9e7a6fSAndy Grover goto err_vzalloc; 18707c9e7a6fSAndy Grover } 18717c9e7a6fSAndy Grover 18727c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 18737c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 18747c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 187580eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 1876b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 18777c9e7a6fSAndy Grover 1878141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 18797c9e7a6fSAndy Grover mb = udev->mb_addr; 18800ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 18816c3796d1Sbstroesser@ts.fujitsu.com mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | TCMU_MAILBOX_FLAG_CAP_READ_LEN; 18827c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 18837c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 18847c9e7a6fSAndy Grover 18857c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 18867c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 188726418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 18887c9e7a6fSAndy Grover 1889ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 18907c9e7a6fSAndy Grover 18917c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 18920633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 189380eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 1894141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 18957c9e7a6fSAndy Grover 18967c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 18977c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 18987c9e7a6fSAndy Grover 18997c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 19007c9e7a6fSAndy Grover info->open = tcmu_open; 19017c9e7a6fSAndy Grover info->release = tcmu_release; 19027c9e7a6fSAndy Grover 19037c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 19047c9e7a6fSAndy Grover if (ret) 19057c9e7a6fSAndy Grover goto err_register; 19067c9e7a6fSAndy Grover 190781ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 190881ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 19097c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 191081ee28deSSheng Yang /* Other attributes can be configured in userspace */ 19113abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 19127c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 19139a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 19149a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 19157c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 19167c9e7a6fSAndy Grover 1917b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 1918b849b456SKenjiro Nakayama * module scope setting. 1919b849b456SKenjiro Nakayama */ 1920b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 1921b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 1922b849b456SKenjiro Nakayama 1923f3cdbe39SMike Christie /* 1924f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1925f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1926f3cdbe39SMike Christie */ 1927f3cdbe39SMike Christie kref_get(&udev->kref); 1928f3cdbe39SMike Christie 1929e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 19307c9e7a6fSAndy Grover if (ret) 19317c9e7a6fSAndy Grover goto err_netlink; 19327c9e7a6fSAndy Grover 1933b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1934b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1935b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1936b6df4b79SXiubo Li 19377c9e7a6fSAndy Grover return 0; 19387c9e7a6fSAndy Grover 19397c9e7a6fSAndy Grover err_netlink: 1940f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19417c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19427c9e7a6fSAndy Grover err_register: 19437c9e7a6fSAndy Grover vfree(udev->mb_addr); 1944c22adc0bSXiubo Li udev->mb_addr = NULL; 19457c9e7a6fSAndy Grover err_vzalloc: 194698effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 194780eb8761SMike Christie udev->data_bitmap = NULL; 194880eb8761SMike Christie err_bitmap_alloc: 19497c9e7a6fSAndy Grover kfree(info->name); 1950f3cdbe39SMike Christie info->name = NULL; 19517c9e7a6fSAndy Grover 19527c9e7a6fSAndy Grover return ret; 19537c9e7a6fSAndy Grover } 19547c9e7a6fSAndy Grover 19557c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 19567c9e7a6fSAndy Grover { 19577c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 195892634706SMike Christie 195992634706SMike Christie /* release ref from init */ 196092634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 196192634706SMike Christie } 196292634706SMike Christie 196392634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 196492634706SMike Christie { 196592634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 19667c9e7a6fSAndy Grover 19679103575aSMike Christie del_timer_sync(&udev->cmd_timer); 19689103575aSMike Christie del_timer_sync(&udev->qfull_timer); 19697c9e7a6fSAndy Grover 1970b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1971b6df4b79SXiubo Li list_del(&udev->node); 1972b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1973b6df4b79SXiubo Li 1974f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 19757c9e7a6fSAndy Grover 19767c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19779260695dSMike Christie 19789260695dSMike Christie /* release ref from configure */ 19799260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19807c9e7a6fSAndy Grover } 19817c9e7a6fSAndy Grover 1982892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 1983892782caSMike Christie { 1984892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1985892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 1986892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 1987892782caSMike Christie } 1988892782caSMike Christie 1989892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 1990892782caSMike Christie { 1991892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1992892782caSMike Christie 1993892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 1994892782caSMike Christie goto unlock; 1995892782caSMike Christie 1996892782caSMike Christie /* complete IO that has executed successfully */ 1997892782caSMike Christie tcmu_handle_completions(udev); 1998892782caSMike Christie /* fail IO waiting to be queued */ 1999a94a2572SXiubo Li run_qfull_queue(udev, true); 2000892782caSMike Christie 2001892782caSMike Christie unlock: 2002892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2003892782caSMike Christie } 2004892782caSMike Christie 2005892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2006892782caSMike Christie { 2007892782caSMike Christie struct tcmu_mailbox *mb; 2008892782caSMike Christie struct tcmu_cmd *cmd; 2009892782caSMike Christie int i; 2010892782caSMike Christie 2011892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2012892782caSMike Christie 2013892782caSMike Christie idr_for_each_entry(&udev->commands, cmd, i) { 2014892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2015892782caSMike Christie cmd->cmd_id, udev->name, 2016892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2017892782caSMike Christie 2018892782caSMike Christie idr_remove(&udev->commands, i); 2019892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2020a86a7586SDmitry Fomichev WARN_ON(!cmd->se_cmd); 2021a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2022892782caSMike Christie if (err_level == 1) { 2023892782caSMike Christie /* 2024892782caSMike Christie * Userspace was not able to start the 2025892782caSMike Christie * command or it is retryable. 2026892782caSMike Christie */ 2027892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2028892782caSMike Christie } else { 2029892782caSMike Christie /* hard failure */ 2030892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2031892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2032892782caSMike Christie } 2033892782caSMike Christie } 2034892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2035892782caSMike Christie tcmu_free_cmd(cmd); 2036892782caSMike Christie } 2037892782caSMike Christie 2038892782caSMike Christie mb = udev->mb_addr; 2039892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2040892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2041892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2042892782caSMike Christie 2043892782caSMike Christie udev->cmdr_last_cleaned = 0; 2044892782caSMike Christie mb->cmd_tail = 0; 2045892782caSMike Christie mb->cmd_head = 0; 2046892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2047066f79a5SBodo Stroesser clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 2048892782caSMike Christie 2049892782caSMike Christie del_timer(&udev->cmd_timer); 2050892782caSMike Christie 205161fb2482SBodo Stroesser run_qfull_queue(udev, false); 205261fb2482SBodo Stroesser 2053892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2054892782caSMike Christie } 2055892782caSMike Christie 20567c9e7a6fSAndy Grover enum { 20573abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 205880eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 20597c9e7a6fSAndy Grover }; 20607c9e7a6fSAndy Grover 20617c9e7a6fSAndy Grover static match_table_t tokens = { 20627c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 20630e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2064b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2065b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2066b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2067c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 20687c9e7a6fSAndy Grover {Opt_err, NULL} 20697c9e7a6fSAndy Grover }; 20707c9e7a6fSAndy Grover 20713abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 20723abaa2bfSMike Christie { 2073b60cb1f8SMike Christie int val, ret; 20743abaa2bfSMike Christie 2075b60cb1f8SMike Christie ret = match_int(arg, &val); 20763abaa2bfSMike Christie if (ret < 0) { 2077b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2078b60cb1f8SMike Christie ret); 20793abaa2bfSMike Christie return ret; 20803abaa2bfSMike Christie } 2081b60cb1f8SMike Christie 2082b60cb1f8SMike Christie if (val <= 0) { 2083b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2084b60cb1f8SMike Christie val); 20853abaa2bfSMike Christie return -EINVAL; 20863abaa2bfSMike Christie } 2087b60cb1f8SMike Christie *dev_attrib = val; 20883abaa2bfSMike Christie return 0; 20893abaa2bfSMike Christie } 20903abaa2bfSMike Christie 2091c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2092c97840c8SMike Christie { 2093c97840c8SMike Christie int val, ret; 2094c97840c8SMike Christie 2095c97840c8SMike Christie ret = match_int(arg, &val); 2096c97840c8SMike Christie if (ret < 0) { 2097c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2098c97840c8SMike Christie ret); 2099c97840c8SMike Christie return ret; 2100c97840c8SMike Christie } 2101c97840c8SMike Christie 2102c97840c8SMike Christie if (val <= 0) { 2103c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2104c97840c8SMike Christie return -EINVAL; 2105c97840c8SMike Christie } 2106c97840c8SMike Christie 2107c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2108c97840c8SMike Christie if (udev->data_bitmap) { 2109c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2110c97840c8SMike Christie ret = -EINVAL; 2111c97840c8SMike Christie goto unlock; 2112c97840c8SMike Christie } 2113c97840c8SMike Christie 2114c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2115c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2116c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2117c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2118c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2119c97840c8SMike Christie } 2120c97840c8SMike Christie 2121c97840c8SMike Christie unlock: 2122c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2123c97840c8SMike Christie return ret; 2124c97840c8SMike Christie } 2125c97840c8SMike Christie 21267c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 21277c9e7a6fSAndy Grover const char *page, ssize_t count) 21287c9e7a6fSAndy Grover { 21297c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 21300e0d7526SMike Christie char *orig, *ptr, *opts; 21317c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2132c97840c8SMike Christie int ret = 0, token; 21337c9e7a6fSAndy Grover 21347c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 21357c9e7a6fSAndy Grover if (!opts) 21367c9e7a6fSAndy Grover return -ENOMEM; 21377c9e7a6fSAndy Grover 21387c9e7a6fSAndy Grover orig = opts; 21397c9e7a6fSAndy Grover 21407c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 21417c9e7a6fSAndy Grover if (!*ptr) 21427c9e7a6fSAndy Grover continue; 21437c9e7a6fSAndy Grover 21447c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 21457c9e7a6fSAndy Grover switch (token) { 21467c9e7a6fSAndy Grover case Opt_dev_config: 21477c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 21487c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 21497c9e7a6fSAndy Grover ret = -EINVAL; 21507c9e7a6fSAndy Grover break; 21517c9e7a6fSAndy Grover } 21527c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 21537c9e7a6fSAndy Grover break; 21547c9e7a6fSAndy Grover case Opt_dev_size: 21550e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 21567c9e7a6fSAndy Grover if (ret < 0) 21570e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 21580e0d7526SMike Christie ret); 21597c9e7a6fSAndy Grover break; 21609c1cd1b6SAndy Grover case Opt_hw_block_size: 21613abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21623abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 21639c1cd1b6SAndy Grover break; 21643abaa2bfSMike Christie case Opt_hw_max_sectors: 21653abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21663abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 21679c1cd1b6SAndy Grover break; 2168b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2169b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2170b849b456SKenjiro Nakayama if (ret < 0) 2171b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2172b60cb1f8SMike Christie ret); 2173b849b456SKenjiro Nakayama break; 217480eb8761SMike Christie case Opt_max_data_area_mb: 2175c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 217680eb8761SMike Christie break; 21777c9e7a6fSAndy Grover default: 21787c9e7a6fSAndy Grover break; 21797c9e7a6fSAndy Grover } 21802579325cSMike Christie 21812579325cSMike Christie if (ret) 21822579325cSMike Christie break; 21837c9e7a6fSAndy Grover } 21847c9e7a6fSAndy Grover 21857c9e7a6fSAndy Grover kfree(orig); 21867c9e7a6fSAndy Grover return (!ret) ? count : ret; 21877c9e7a6fSAndy Grover } 21887c9e7a6fSAndy Grover 21897c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 21907c9e7a6fSAndy Grover { 21917c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 21927c9e7a6fSAndy Grover ssize_t bl = 0; 21937c9e7a6fSAndy Grover 21947c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 21957c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 21960e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 219780eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 219880eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 21997c9e7a6fSAndy Grover 22007c9e7a6fSAndy Grover return bl; 22017c9e7a6fSAndy Grover } 22027c9e7a6fSAndy Grover 22037c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 22047c9e7a6fSAndy Grover { 22057c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 22067c9e7a6fSAndy Grover 22077c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 22087c9e7a6fSAndy Grover dev->dev_attrib.block_size); 22097c9e7a6fSAndy Grover } 22107c9e7a6fSAndy Grover 22117c9e7a6fSAndy Grover static sense_reason_t 22127c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 22137c9e7a6fSAndy Grover { 221402eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 22159c1cd1b6SAndy Grover } 22169c1cd1b6SAndy Grover 22177d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 22187d7a7435SNicholas Bellinger { 22197d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22207d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2221b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22227d7a7435SNicholas Bellinger 22237d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 22247d7a7435SNicholas Bellinger } 22257d7a7435SNicholas Bellinger 22267d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 22277d7a7435SNicholas Bellinger size_t count) 22287d7a7435SNicholas Bellinger { 22297d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22307d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 22317d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 22327d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 22337d7a7435SNicholas Bellinger u32 val; 22347d7a7435SNicholas Bellinger int ret; 22357d7a7435SNicholas Bellinger 22367d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 22377d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 22387d7a7435SNicholas Bellinger return -EINVAL; 22397d7a7435SNicholas Bellinger } 22407d7a7435SNicholas Bellinger 22417d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 22427d7a7435SNicholas Bellinger if (ret < 0) 22437d7a7435SNicholas Bellinger return ret; 22447d7a7435SNicholas Bellinger 22457d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 22467d7a7435SNicholas Bellinger return count; 22477d7a7435SNicholas Bellinger } 22487d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 22497d7a7435SNicholas Bellinger 22509103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 22519103575aSMike Christie { 22529103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 22539103575aSMike Christie struct se_dev_attrib, da_group); 22549103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22559103575aSMike Christie 22569103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 22579103575aSMike Christie udev->qfull_time_out : 22589103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 22599103575aSMike Christie } 22609103575aSMike Christie 22619103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 22629103575aSMike Christie const char *page, size_t count) 22639103575aSMike Christie { 22649103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 22659103575aSMike Christie struct se_dev_attrib, da_group); 22669103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22679103575aSMike Christie s32 val; 22689103575aSMike Christie int ret; 22699103575aSMike Christie 22709103575aSMike Christie ret = kstrtos32(page, 0, &val); 22719103575aSMike Christie if (ret < 0) 22729103575aSMike Christie return ret; 22739103575aSMike Christie 22749103575aSMike Christie if (val >= 0) { 22759103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2276125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2277125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 22789103575aSMike Christie } else { 22799103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 22809103575aSMike Christie return -EINVAL; 22819103575aSMike Christie } 22829103575aSMike Christie return count; 22839103575aSMike Christie } 22849103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 22859103575aSMike Christie 228680eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 228780eb8761SMike Christie { 228880eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 228980eb8761SMike Christie struct se_dev_attrib, da_group); 229080eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 229180eb8761SMike Christie 229280eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 229380eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 229480eb8761SMike Christie } 229580eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 229680eb8761SMike Christie 22972d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2298ee018252SBryant G. Ly { 2299ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2300ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2301ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2302ee018252SBryant G. Ly 2303ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2304ee018252SBryant G. Ly } 2305ee018252SBryant G. Ly 230602ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 230702ccfb54SZhu Lingshan const char *reconfig_data) 230802ccfb54SZhu Lingshan { 230902ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 231002ccfb54SZhu Lingshan void *msg_header = NULL; 231102ccfb54SZhu Lingshan int ret = 0; 231202ccfb54SZhu Lingshan 231302ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 231402ccfb54SZhu Lingshan &skb, &msg_header); 231502ccfb54SZhu Lingshan if (ret < 0) 231602ccfb54SZhu Lingshan return ret; 231702ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 231802ccfb54SZhu Lingshan if (ret < 0) { 231902ccfb54SZhu Lingshan nlmsg_free(skb); 232002ccfb54SZhu Lingshan return ret; 232102ccfb54SZhu Lingshan } 232202ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 232306add777SMike Christie skb, msg_header); 232402ccfb54SZhu Lingshan } 232502ccfb54SZhu Lingshan 232602ccfb54SZhu Lingshan 23272d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2328ee018252SBryant G. Ly size_t count) 2329ee018252SBryant G. Ly { 2330ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2331ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2332ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 23332d76443eSMike Christie int ret, len; 2334ee018252SBryant G. Ly 23352d76443eSMike Christie len = strlen(page); 23362d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2337ee018252SBryant G. Ly return -EINVAL; 2338ee018252SBryant G. Ly 2339ee018252SBryant G. Ly /* Check if device has been configured before */ 234063d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 234102ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2342ee018252SBryant G. Ly if (ret) { 2343ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2344ee018252SBryant G. Ly return ret; 2345ee018252SBryant G. Ly } 2346de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2347de8c5221SBryant G. Ly 2348de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2349de8c5221SBryant G. Ly if (ret) 2350de8c5221SBryant G. Ly return ret; 2351de8c5221SBryant G. Ly return count; 2352ee018252SBryant G. Ly } 23532d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2354ee018252SBryant G. Ly 2355ee018252SBryant G. Ly return count; 2356ee018252SBryant G. Ly } 23572d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2358ee018252SBryant G. Ly 2359801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2360801fc54dSBryant G. Ly { 2361801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2362801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2363801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2364801fc54dSBryant G. Ly 23650e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2366801fc54dSBryant G. Ly } 2367801fc54dSBryant G. Ly 236884e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 236984e28506SZhu Lingshan { 237084e28506SZhu Lingshan struct sk_buff *skb = NULL; 237184e28506SZhu Lingshan void *msg_header = NULL; 237284e28506SZhu Lingshan int ret = 0; 237384e28506SZhu Lingshan 237484e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 237584e28506SZhu Lingshan &skb, &msg_header); 237684e28506SZhu Lingshan if (ret < 0) 237784e28506SZhu Lingshan return ret; 237884e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 237984e28506SZhu Lingshan size, TCMU_ATTR_PAD); 238084e28506SZhu Lingshan if (ret < 0) { 238184e28506SZhu Lingshan nlmsg_free(skb); 238284e28506SZhu Lingshan return ret; 238384e28506SZhu Lingshan } 238484e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 238506add777SMike Christie skb, msg_header); 238684e28506SZhu Lingshan } 238784e28506SZhu Lingshan 2388801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2389801fc54dSBryant G. Ly size_t count) 2390801fc54dSBryant G. Ly { 2391801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2392801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2393801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 23942d76443eSMike Christie u64 val; 2395801fc54dSBryant G. Ly int ret; 2396801fc54dSBryant G. Ly 23972d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2398801fc54dSBryant G. Ly if (ret < 0) 2399801fc54dSBryant G. Ly return ret; 2400801fc54dSBryant G. Ly 2401801fc54dSBryant G. Ly /* Check if device has been configured before */ 240263d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 240384e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2404801fc54dSBryant G. Ly if (ret) { 2405801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2406801fc54dSBryant G. Ly return ret; 2407801fc54dSBryant G. Ly } 2408801fc54dSBryant G. Ly } 24092d76443eSMike Christie udev->dev_size = val; 2410801fc54dSBryant G. Ly return count; 2411801fc54dSBryant G. Ly } 2412801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2413801fc54dSBryant G. Ly 2414b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2415b849b456SKenjiro Nakayama char *page) 2416b849b456SKenjiro Nakayama { 2417b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2418b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2419b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2420b849b456SKenjiro Nakayama 2421b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2422b849b456SKenjiro Nakayama } 2423b849b456SKenjiro Nakayama 2424b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2425b849b456SKenjiro Nakayama const char *page, size_t count) 2426b849b456SKenjiro Nakayama { 2427b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2428b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2429b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2430b849b456SKenjiro Nakayama s8 val; 2431b849b456SKenjiro Nakayama int ret; 2432b849b456SKenjiro Nakayama 2433b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2434b849b456SKenjiro Nakayama if (ret < 0) 2435b849b456SKenjiro Nakayama return ret; 2436b849b456SKenjiro Nakayama 2437b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2438b849b456SKenjiro Nakayama return count; 2439b849b456SKenjiro Nakayama } 2440b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2441b849b456SKenjiro Nakayama 24429a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 24439a8bb606SBryant G. Ly char *page) 24449a8bb606SBryant G. Ly { 24459a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24469a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24479a8bb606SBryant G. Ly 24489a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 24499a8bb606SBryant G. Ly } 24509a8bb606SBryant G. Ly 245133d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 245233d065ccSZhu Lingshan { 245333d065ccSZhu Lingshan struct sk_buff *skb = NULL; 245433d065ccSZhu Lingshan void *msg_header = NULL; 245533d065ccSZhu Lingshan int ret = 0; 245633d065ccSZhu Lingshan 245733d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 245833d065ccSZhu Lingshan &skb, &msg_header); 245933d065ccSZhu Lingshan if (ret < 0) 246033d065ccSZhu Lingshan return ret; 246133d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 246233d065ccSZhu Lingshan if (ret < 0) { 246333d065ccSZhu Lingshan nlmsg_free(skb); 246433d065ccSZhu Lingshan return ret; 246533d065ccSZhu Lingshan } 246633d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 246706add777SMike Christie skb, msg_header); 246833d065ccSZhu Lingshan } 246933d065ccSZhu Lingshan 24709a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 24719a8bb606SBryant G. Ly const char *page, size_t count) 24729a8bb606SBryant G. Ly { 24739a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24749a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24751068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24762d76443eSMike Christie u8 val; 24779a8bb606SBryant G. Ly int ret; 24789a8bb606SBryant G. Ly 24792d76443eSMike Christie ret = kstrtou8(page, 0, &val); 24809a8bb606SBryant G. Ly if (ret < 0) 24819a8bb606SBryant G. Ly return ret; 24829a8bb606SBryant G. Ly 24831068be7bSBryant G. Ly /* Check if device has been configured before */ 248463d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 248533d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 24861068be7bSBryant G. Ly if (ret) { 24871068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 24881068be7bSBryant G. Ly return ret; 24891068be7bSBryant G. Ly } 24901068be7bSBryant G. Ly } 24912d76443eSMike Christie 24922d76443eSMike Christie da->emulate_write_cache = val; 24939a8bb606SBryant G. Ly return count; 24949a8bb606SBryant G. Ly } 24959a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 24969a8bb606SBryant G. Ly 2497892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2498892782caSMike Christie { 2499892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2500892782caSMike Christie struct se_device, 2501892782caSMike Christie dev_action_group); 2502892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2503892782caSMike Christie 2504892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2505892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2506892782caSMike Christie else 2507892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2508892782caSMike Christie } 2509892782caSMike Christie 2510892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2511892782caSMike Christie size_t count) 2512892782caSMike Christie { 2513892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2514892782caSMike Christie struct se_device, 2515892782caSMike Christie dev_action_group); 2516892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2517892782caSMike Christie u8 val; 2518892782caSMike Christie int ret; 2519892782caSMike Christie 2520a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2521a30b0473SMike Christie pr_err("Device is not configured.\n"); 2522a30b0473SMike Christie return -EINVAL; 2523a30b0473SMike Christie } 2524a30b0473SMike Christie 2525892782caSMike Christie ret = kstrtou8(page, 0, &val); 2526892782caSMike Christie if (ret < 0) 2527892782caSMike Christie return ret; 2528892782caSMike Christie 2529892782caSMike Christie if (val > 1) { 2530892782caSMike Christie pr_err("Invalid block value %d\n", val); 2531892782caSMike Christie return -EINVAL; 2532892782caSMike Christie } 2533892782caSMike Christie 2534892782caSMike Christie if (!val) 2535892782caSMike Christie tcmu_unblock_dev(udev); 2536892782caSMike Christie else 2537892782caSMike Christie tcmu_block_dev(udev); 2538892782caSMike Christie return count; 2539892782caSMike Christie } 2540892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2541892782caSMike Christie 2542892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2543892782caSMike Christie size_t count) 2544892782caSMike Christie { 2545892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2546892782caSMike Christie struct se_device, 2547892782caSMike Christie dev_action_group); 2548892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2549892782caSMike Christie u8 val; 2550892782caSMike Christie int ret; 2551892782caSMike Christie 2552a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2553a30b0473SMike Christie pr_err("Device is not configured.\n"); 2554a30b0473SMike Christie return -EINVAL; 2555a30b0473SMike Christie } 2556a30b0473SMike Christie 2557892782caSMike Christie ret = kstrtou8(page, 0, &val); 2558892782caSMike Christie if (ret < 0) 2559892782caSMike Christie return ret; 2560892782caSMike Christie 2561892782caSMike Christie if (val != 1 && val != 2) { 2562892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2563892782caSMike Christie return -EINVAL; 2564892782caSMike Christie } 2565892782caSMike Christie 2566892782caSMike Christie tcmu_reset_ring(udev, val); 2567892782caSMike Christie return count; 2568892782caSMike Christie } 2569892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2570892782caSMike Christie 25715821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2572801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 25739103575aSMike Christie &tcmu_attr_qfull_time_out, 257480eb8761SMike Christie &tcmu_attr_max_data_area_mb, 25752d76443eSMike Christie &tcmu_attr_dev_config, 2576801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2577801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 2578b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2579801fc54dSBryant G. Ly NULL, 2580801fc54dSBryant G. Ly }; 2581801fc54dSBryant G. Ly 25827d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 25837d7a7435SNicholas Bellinger 2584892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2585892782caSMike Christie &tcmu_attr_block_dev, 2586892782caSMike Christie &tcmu_attr_reset_ring, 2587892782caSMike Christie NULL, 2588892782caSMike Christie }; 2589892782caSMike Christie 25907d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 25917c9e7a6fSAndy Grover .name = "user", 25927c9e7a6fSAndy Grover .owner = THIS_MODULE, 259369088a04SBodo Stroesser .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, 2594356ba2a8SBodo Stroesser .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | 2595356ba2a8SBodo Stroesser TRANSPORT_FLAG_PASSTHROUGH_ALUA, 25967c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 25977c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 25987c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 25997c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 260092634706SMike Christie .destroy_device = tcmu_destroy_device, 26017c9e7a6fSAndy Grover .free_device = tcmu_free_device, 26027c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 26037c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 26047c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 26057c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 26067c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2607892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 26087c9e7a6fSAndy Grover }; 26097c9e7a6fSAndy Grover 261089ec9cfdSMike Christie static void find_free_blocks(void) 2611b6df4b79SXiubo Li { 2612b6df4b79SXiubo Li struct tcmu_dev *udev; 2613b6df4b79SXiubo Li loff_t off; 2614af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2615af1dd7ffSMike Christie 261680eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2617af1dd7ffSMike Christie return; 2618b6df4b79SXiubo Li 2619b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2620b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2621b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2622b6df4b79SXiubo Li 2623dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2624dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2625dc335a99SMike Christie continue; 2626dc335a99SMike Christie } 2627dc335a99SMike Christie 2628b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2629b6df4b79SXiubo Li tcmu_handle_completions(udev); 2630b6df4b79SXiubo Li 2631af1dd7ffSMike Christie /* Skip the udevs in idle */ 2632af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2633b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2634b6df4b79SXiubo Li continue; 2635b6df4b79SXiubo Li } 2636b6df4b79SXiubo Li 2637b6df4b79SXiubo Li end = udev->dbi_max + 1; 2638b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2639b6df4b79SXiubo Li if (block == udev->dbi_max) { 2640b6df4b79SXiubo Li /* 2641af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2642af1dd7ffSMike Christie * reclaim any blocks. 2643b6df4b79SXiubo Li */ 2644b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2645b6df4b79SXiubo Li continue; 2646b6df4b79SXiubo Li } else if (block == end) { 2647b6df4b79SXiubo Li /* The current udev will goto idle state */ 2648b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2649b6df4b79SXiubo Li udev->dbi_max = 0; 2650b6df4b79SXiubo Li } else { 2651b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2652b6df4b79SXiubo Li udev->dbi_max = block; 2653b6df4b79SXiubo Li } 2654b6df4b79SXiubo Li 2655b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2656b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2657b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2658b6df4b79SXiubo Li 2659b6df4b79SXiubo Li /* Release the block pages */ 2660bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2661b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2662af1dd7ffSMike Christie 2663af1dd7ffSMike Christie total_freed += end - start; 2664af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2665af1dd7ffSMike Christie total_freed, udev->name); 2666b6df4b79SXiubo Li } 266789ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 266889ec9cfdSMike Christie 266980eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2670af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2671b6df4b79SXiubo Li } 2672b6df4b79SXiubo Li 2673488ebe4cSMike Christie static void check_timedout_devices(void) 2674488ebe4cSMike Christie { 2675488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 267661fb2482SBodo Stroesser struct tcmu_cmd *cmd, *tmp_cmd; 2677488ebe4cSMike Christie LIST_HEAD(devs); 2678488ebe4cSMike Christie 2679488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2680488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2681488ebe4cSMike Christie 2682488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2683488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2684488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2685488ebe4cSMike Christie 26866fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2687a94a2572SXiubo Li 268861fb2482SBodo Stroesser /* 268961fb2482SBodo Stroesser * If cmd_time_out is disabled but qfull is set deadline 269061fb2482SBodo Stroesser * will only reflect the qfull timeout. Ignore it. 269161fb2482SBodo Stroesser */ 269261fb2482SBodo Stroesser if (udev->cmd_time_out) { 269361fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, 269461fb2482SBodo Stroesser &udev->inflight_queue, 269561fb2482SBodo Stroesser queue_entry) { 269661fb2482SBodo Stroesser tcmu_check_expired_ring_cmd(cmd); 269761fb2482SBodo Stroesser } 269861fb2482SBodo Stroesser tcmu_set_next_deadline(&udev->inflight_queue, 269961fb2482SBodo Stroesser &udev->cmd_timer); 270061fb2482SBodo Stroesser } 270161fb2482SBodo Stroesser list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, 270261fb2482SBodo Stroesser queue_entry) { 270361fb2482SBodo Stroesser tcmu_check_expired_queue_cmd(cmd); 270461fb2482SBodo Stroesser } 2705a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2706a94a2572SXiubo Li 27076fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2708488ebe4cSMike Christie 2709488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2710488ebe4cSMike Christie } 2711488ebe4cSMike Christie 2712488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2713488ebe4cSMike Christie } 2714488ebe4cSMike Christie 27159972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 271689ec9cfdSMike Christie { 2717488ebe4cSMike Christie check_timedout_devices(); 271889ec9cfdSMike Christie find_free_blocks(); 271989ec9cfdSMike Christie } 272089ec9cfdSMike Christie 27217c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 27227c9e7a6fSAndy Grover { 2723801fc54dSBryant G. Ly int ret, i, k, len = 0; 27247c9e7a6fSAndy Grover 27257c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 27267c9e7a6fSAndy Grover 2727af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 27289972cebbSMike Christie 27297c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 27307c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 27317c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 27327c9e7a6fSAndy Grover 0, NULL); 27337c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 27347c9e7a6fSAndy Grover return -ENOMEM; 27357c9e7a6fSAndy Grover 27367c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 27377c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 27387c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 27397c9e7a6fSAndy Grover goto out_free_cache; 27407c9e7a6fSAndy Grover } 27417c9e7a6fSAndy Grover 27427c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 27437c9e7a6fSAndy Grover if (ret < 0) { 27447c9e7a6fSAndy Grover goto out_unreg_device; 27457c9e7a6fSAndy Grover } 27467c9e7a6fSAndy Grover 27474703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 27487d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 27494703b625SBodo Stroesser for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) 2750801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 27514703b625SBodo Stroesser for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) 27524703b625SBodo Stroesser len += sizeof(struct configfs_attribute *); 2753801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 27547d7a7435SNicholas Bellinger 27557d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 27567d7a7435SNicholas Bellinger if (!tcmu_attrs) { 27577d7a7435SNicholas Bellinger ret = -ENOMEM; 27587d7a7435SNicholas Bellinger goto out_unreg_genl; 27597d7a7435SNicholas Bellinger } 27607d7a7435SNicholas Bellinger 27614703b625SBodo Stroesser for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) 27627d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 27634703b625SBodo Stroesser for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) 27644703b625SBodo Stroesser tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; 27654703b625SBodo Stroesser for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) 27664703b625SBodo Stroesser tcmu_attrs[i++] = tcmu_attrib_attrs[k]; 27677d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 27687d7a7435SNicholas Bellinger 27690a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 27707c9e7a6fSAndy Grover if (ret) 27717d7a7435SNicholas Bellinger goto out_attrs; 27727c9e7a6fSAndy Grover 27737c9e7a6fSAndy Grover return 0; 27747c9e7a6fSAndy Grover 27757d7a7435SNicholas Bellinger out_attrs: 27767d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27777c9e7a6fSAndy Grover out_unreg_genl: 27787c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27797c9e7a6fSAndy Grover out_unreg_device: 27807c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27817c9e7a6fSAndy Grover out_free_cache: 27827c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27837c9e7a6fSAndy Grover 27847c9e7a6fSAndy Grover return ret; 27857c9e7a6fSAndy Grover } 27867c9e7a6fSAndy Grover 27877c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 27887c9e7a6fSAndy Grover { 2789af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 27900a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 27917d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27927c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27937c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27947c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27957c9e7a6fSAndy Grover } 27967c9e7a6fSAndy Grover 27977c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 27987c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 27997c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 28007c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 28017c9e7a6fSAndy Grover 28027c9e7a6fSAndy Grover module_init(tcmu_module_init); 28037c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 2804