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 184a94a2572SXiubo Li #define TCMU_CMD_BIT_INFLIGHT 1 1857c9e7a6fSAndy Grover unsigned long flags; 1867c9e7a6fSAndy Grover }; 187af1dd7ffSMike Christie /* 188af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 189af1dd7ffSMike Christie * 190af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 191af1dd7ffSMike Christie * ... 192af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 193af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 194af1dd7ffSMike Christie * ... 195af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 196af1dd7ffSMike Christie */ 197b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 198b6df4b79SXiubo Li static LIST_HEAD(root_udev); 199b6df4b79SXiubo Li 200488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 201488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 202488ebe4cSMike Christie 20380eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 20480eb8761SMike Christie 205b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 206af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 20780eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 208b6df4b79SXiubo Li 20980eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 21080eb8761SMike Christie const struct kernel_param *kp) 21180eb8761SMike Christie { 21280eb8761SMike Christie int ret, max_area_mb; 21380eb8761SMike Christie 21480eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 21580eb8761SMike Christie if (ret) 21680eb8761SMike Christie return -EINVAL; 21780eb8761SMike Christie 21880eb8761SMike Christie if (max_area_mb <= 0) { 21980eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 22080eb8761SMike Christie return -EINVAL; 22180eb8761SMike Christie } 22280eb8761SMike Christie 22380eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 22480eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 22580eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 22680eb8761SMike Christie else 22780eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 22880eb8761SMike Christie 22980eb8761SMike Christie return 0; 23080eb8761SMike Christie } 23180eb8761SMike Christie 23280eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 23380eb8761SMike Christie const struct kernel_param *kp) 23480eb8761SMike Christie { 23580eb8761SMike Christie return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 23680eb8761SMike Christie } 23780eb8761SMike Christie 23880eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 23980eb8761SMike Christie .set = tcmu_set_global_max_data_area, 24080eb8761SMike Christie .get = tcmu_get_global_max_data_area, 24180eb8761SMike Christie }; 24280eb8761SMike Christie 24380eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 24480eb8761SMike Christie S_IWUSR | S_IRUGO); 24580eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 24680eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 24780eb8761SMike Christie "data areas."); 2487c9e7a6fSAndy Grover 249bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 250bdaeedc1SMike Christie const struct kernel_param *kp) 251bdaeedc1SMike Christie { 252bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 253bdaeedc1SMike Christie "blocked" : "unblocked"); 254bdaeedc1SMike Christie } 255bdaeedc1SMike Christie 256bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 257bdaeedc1SMike Christie const struct kernel_param *kp) 258bdaeedc1SMike Christie { 259bdaeedc1SMike Christie int ret; 260bdaeedc1SMike Christie u8 val; 261bdaeedc1SMike Christie 262bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 263bdaeedc1SMike Christie if (ret < 0) 264bdaeedc1SMike Christie return ret; 265bdaeedc1SMike Christie 266bdaeedc1SMike Christie if (val > 1) { 267bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 268bdaeedc1SMike Christie return -EINVAL; 269bdaeedc1SMike Christie } 270bdaeedc1SMike Christie 271bdaeedc1SMike Christie tcmu_netlink_blocked = val; 272bdaeedc1SMike Christie return 0; 273bdaeedc1SMike Christie } 274bdaeedc1SMike Christie 275bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 276bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 277bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 278bdaeedc1SMike Christie }; 279bdaeedc1SMike Christie 280bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 281bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 282bdaeedc1SMike Christie 283bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 284bdaeedc1SMike Christie { 285bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 286bdaeedc1SMike Christie 287bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 288bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 289bdaeedc1SMike Christie return -EBUSY; 290bdaeedc1SMike Christie } 291bdaeedc1SMike Christie 292bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 293bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 294bdaeedc1SMike Christie nl_cmd->status = -EINTR; 295bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 296bdaeedc1SMike Christie complete(&nl_cmd->complete); 297bdaeedc1SMike Christie } 298bdaeedc1SMike Christie return 0; 299bdaeedc1SMike Christie } 300bdaeedc1SMike Christie 301bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 302bdaeedc1SMike Christie const struct kernel_param *kp) 303bdaeedc1SMike Christie { 304bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 305bdaeedc1SMike Christie int ret; 306bdaeedc1SMike Christie u8 val; 307bdaeedc1SMike Christie 308bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 309bdaeedc1SMike Christie if (ret < 0) 310bdaeedc1SMike Christie return ret; 311bdaeedc1SMike Christie 312bdaeedc1SMike Christie if (val != 1) { 313bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 314bdaeedc1SMike Christie return -EINVAL; 315bdaeedc1SMike Christie } 316bdaeedc1SMike Christie 317bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 318bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 319bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 320bdaeedc1SMike Christie if (ret) 321bdaeedc1SMike Christie break; 322bdaeedc1SMike Christie } 323bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 324bdaeedc1SMike Christie 325bdaeedc1SMike Christie return ret; 326bdaeedc1SMike Christie } 327bdaeedc1SMike Christie 328bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 329bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 330bdaeedc1SMike Christie }; 331bdaeedc1SMike Christie 332bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 333bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 334bdaeedc1SMike Christie 3357c9e7a6fSAndy Grover /* multicast group */ 3367c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3377c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3387c9e7a6fSAndy Grover }; 3397c9e7a6fSAndy Grover 3407c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3417c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3427c9e7a6fSAndy Grover }; 3437c9e7a6fSAndy Grover 344b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 345b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 346b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 347b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 348b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 349b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 350b3af66e2SMike Christie }; 351b3af66e2SMike Christie 352b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 353b3af66e2SMike Christie { 3543228691fSMike Christie struct tcmu_dev *udev = NULL; 355b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 356b3af66e2SMike Christie int dev_id, rc, ret = 0; 357b3af66e2SMike Christie 358b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 359b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 360b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 361b3af66e2SMike Christie return -EINVAL; 362b3af66e2SMike Christie } 363b3af66e2SMike Christie 364b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 365b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 366b3af66e2SMike Christie 3673228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3683228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3693228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3703228691fSMike Christie udev = nl_cmd->udev; 3713228691fSMike Christie break; 372b3af66e2SMike Christie } 3733228691fSMike Christie } 374b3af66e2SMike Christie 3753228691fSMike Christie if (!udev) { 3760c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3773228691fSMike Christie completed_cmd, rc, dev_id); 3783228691fSMike Christie ret = -ENODEV; 3793228691fSMike Christie goto unlock; 3803228691fSMike Christie } 3813228691fSMike Christie list_del(&nl_cmd->nl_list); 382b3af66e2SMike Christie 383bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 384bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 385bdaeedc1SMike Christie nl_cmd->status); 386b3af66e2SMike Christie 387b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 3883228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 3893228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 390b3af66e2SMike Christie ret = -EINVAL; 3913228691fSMike Christie goto unlock; 392b3af66e2SMike Christie } 393b3af66e2SMike Christie 3943228691fSMike Christie nl_cmd->status = rc; 395b3af66e2SMike Christie complete(&nl_cmd->complete); 3963228691fSMike Christie unlock: 3973228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 398b3af66e2SMike Christie return ret; 399b3af66e2SMike Christie } 400b3af66e2SMike Christie 401b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 402b3af66e2SMike Christie { 403b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 404b3af66e2SMike Christie } 405b3af66e2SMike Christie 406b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 407b3af66e2SMike Christie { 408b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 409b3af66e2SMike Christie } 410b3af66e2SMike Christie 411b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 412b3af66e2SMike Christie struct genl_info *info) 413b3af66e2SMike Christie { 414b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 415b3af66e2SMike Christie } 416b3af66e2SMike Christie 417b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 418b3af66e2SMike Christie { 419b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 420b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 421b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 422b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 423b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 424b3af66e2SMike Christie } 425b3af66e2SMike Christie 426b3af66e2SMike Christie return 0; 427b3af66e2SMike Christie } 428b3af66e2SMike Christie 429b3af66e2SMike Christie static const struct genl_ops tcmu_genl_ops[] = { 430b3af66e2SMike Christie { 431b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 432ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 433b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 434b3af66e2SMike Christie .doit = tcmu_genl_set_features, 435b3af66e2SMike Christie }, 436b3af66e2SMike Christie { 437b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 438ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 439b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 440b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 441b3af66e2SMike Christie }, 442b3af66e2SMike Christie { 443b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 444ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 445b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 446b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 447b3af66e2SMike Christie }, 448b3af66e2SMike Christie { 449b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 450ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 451b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 452b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 453b3af66e2SMike Christie }, 454b3af66e2SMike Christie }; 455b3af66e2SMike Christie 4567c9e7a6fSAndy Grover /* Our generic netlink family */ 45756989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 458489111e5SJohannes Berg .module = THIS_MODULE, 4597c9e7a6fSAndy Grover .hdrsize = 0, 4607c9e7a6fSAndy Grover .name = "TCM-USER", 461b3af66e2SMike Christie .version = 2, 4627c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4633b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4647c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4657c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 46620c08b36SSheng Yang .netnsok = true, 467b3af66e2SMike Christie .ops = tcmu_genl_ops, 468b3af66e2SMike Christie .n_ops = ARRAY_SIZE(tcmu_genl_ops), 4697c9e7a6fSAndy Grover }; 4707c9e7a6fSAndy Grover 471141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 472141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 473141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 474141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 475141685a3SXiubo Li 476b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 477141685a3SXiubo Li { 478141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 479141685a3SXiubo Li uint32_t i; 480141685a3SXiubo Li 481b6df4b79SXiubo Li for (i = 0; i < len; i++) 482141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 483141685a3SXiubo Li } 484141685a3SXiubo Li 485b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 486b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 487141685a3SXiubo Li { 488b6df4b79SXiubo Li struct page *page; 489b6df4b79SXiubo Li int ret, dbi; 490141685a3SXiubo Li 491b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 492b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 493b6df4b79SXiubo Li return false; 494b6df4b79SXiubo Li 495b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 496b6df4b79SXiubo Li if (!page) { 497b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 49880eb8761SMike Christie tcmu_global_max_blocks) 499af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 500b6df4b79SXiubo Li 501b6df4b79SXiubo Li /* try to get new page from the mm */ 502b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL); 503b6df4b79SXiubo Li if (!page) 504daf78c30SXiubo Li goto err_alloc; 505b6df4b79SXiubo Li 506b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 507daf78c30SXiubo Li if (ret) 508daf78c30SXiubo Li goto err_insert; 509b6df4b79SXiubo Li } 510b6df4b79SXiubo Li 511141685a3SXiubo Li if (dbi > udev->dbi_max) 512141685a3SXiubo Li udev->dbi_max = dbi; 513141685a3SXiubo Li 514141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 515b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 516141685a3SXiubo Li 517b6df4b79SXiubo Li return true; 518daf78c30SXiubo Li err_insert: 519daf78c30SXiubo Li __free_page(page); 520daf78c30SXiubo Li err_alloc: 521daf78c30SXiubo Li atomic_dec(&global_db_count); 522daf78c30SXiubo Li return false; 523141685a3SXiubo Li } 524141685a3SXiubo Li 525b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 526b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 527b6df4b79SXiubo Li { 528b6df4b79SXiubo Li int i; 529b6df4b79SXiubo Li 530b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 531b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 532af1dd7ffSMike Christie return false; 533141685a3SXiubo Li } 534b6df4b79SXiubo Li return true; 535141685a3SXiubo Li } 536141685a3SXiubo Li 537b6df4b79SXiubo Li static inline struct page * 538b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 539141685a3SXiubo Li { 540141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 541141685a3SXiubo Li } 542141685a3SXiubo Li 543141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 544141685a3SXiubo Li { 545141685a3SXiubo Li kfree(tcmu_cmd->dbi); 546141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 547141685a3SXiubo Li } 548141685a3SXiubo Li 549141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 550141685a3SXiubo Li { 551141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 552141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 553141685a3SXiubo Li 554141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 555141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 556141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 557141685a3SXiubo Li DATA_BLOCK_SIZE); 558141685a3SXiubo Li } 559141685a3SXiubo Li 560141685a3SXiubo Li return data_length; 561141685a3SXiubo Li } 562141685a3SXiubo Li 563141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 564141685a3SXiubo Li { 565141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 566141685a3SXiubo Li 567141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 568141685a3SXiubo Li } 569141685a3SXiubo Li 5707c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 5717c9e7a6fSAndy Grover { 5727c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5737c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5747c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5757c9e7a6fSAndy Grover 5767c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 5777c9e7a6fSAndy Grover if (!tcmu_cmd) 5787c9e7a6fSAndy Grover return NULL; 5797c9e7a6fSAndy Grover 580a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 5817c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 5827c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 5837c9e7a6fSAndy Grover 584141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 585141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 586141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 587141685a3SXiubo Li GFP_KERNEL); 588141685a3SXiubo Li if (!tcmu_cmd->dbi) { 589141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 590141685a3SXiubo Li return NULL; 591141685a3SXiubo Li } 592141685a3SXiubo Li 5937c9e7a6fSAndy Grover return tcmu_cmd; 5947c9e7a6fSAndy Grover } 5957c9e7a6fSAndy Grover 5967c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 5977c9e7a6fSAndy Grover { 598b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 59926d2b310Stangwenji void *start = vaddr - offset; 6007c9e7a6fSAndy Grover 6017c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6027c9e7a6fSAndy Grover 6037c9e7a6fSAndy Grover while (size) { 60426d2b310Stangwenji flush_dcache_page(virt_to_page(start)); 60526d2b310Stangwenji start += PAGE_SIZE; 6067c9e7a6fSAndy Grover size -= PAGE_SIZE; 6077c9e7a6fSAndy Grover } 6087c9e7a6fSAndy Grover } 6097c9e7a6fSAndy Grover 6107c9e7a6fSAndy Grover /* 6117c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6127c9e7a6fSAndy Grover * we can't use circ_buf.h. 6137c9e7a6fSAndy Grover */ 6147c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6157c9e7a6fSAndy Grover { 6167c9e7a6fSAndy Grover int diff = head - tail; 6177c9e7a6fSAndy Grover 6187c9e7a6fSAndy Grover if (diff >= 0) 6197c9e7a6fSAndy Grover return diff; 6207c9e7a6fSAndy Grover else 6217c9e7a6fSAndy Grover return size + diff; 6227c9e7a6fSAndy Grover } 6237c9e7a6fSAndy Grover 6247c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6257c9e7a6fSAndy Grover { 6267c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6277c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6287c9e7a6fSAndy Grover } 6297c9e7a6fSAndy Grover 6307c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6317c9e7a6fSAndy Grover { 6327c9e7a6fSAndy Grover return size - head; 6337c9e7a6fSAndy Grover } 6347c9e7a6fSAndy Grover 6353e609135SXiubo Li static inline void new_iov(struct iovec **iov, int *iov_cnt) 636f1dbd087SSheng Yang { 637f1dbd087SSheng Yang struct iovec *iovec; 638f1dbd087SSheng Yang 639f1dbd087SSheng Yang if (*iov_cnt != 0) 640f1dbd087SSheng Yang (*iov)++; 641f1dbd087SSheng Yang (*iov_cnt)++; 642f1dbd087SSheng Yang 643f1dbd087SSheng Yang iovec = *iov; 644f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 645f1dbd087SSheng Yang } 646f1dbd087SSheng Yang 6477c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6487c9e7a6fSAndy Grover 64926418649SSheng Yang /* offset is relative to mb_addr */ 650141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 651141685a3SXiubo Li int dbi, int remaining) 65226418649SSheng Yang { 653141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 65426418649SSheng Yang DATA_BLOCK_SIZE - remaining; 65526418649SSheng Yang } 65626418649SSheng Yang 657daf78c30SXiubo Li static inline size_t iov_tail(struct iovec *iov) 65826418649SSheng Yang { 65926418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 66026418649SSheng Yang } 66126418649SSheng Yang 6621a1fc0b8SMike Christie static void scatter_data_area(struct tcmu_dev *udev, 663141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 664141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 665141685a3SXiubo Li int *iov_cnt, bool copy_data) 666f97ec7dbSIlias Tsitsimpis { 667141685a3SXiubo Li int i, dbi; 66826418649SSheng Yang int block_remaining = 0; 669141685a3SXiubo Li void *from, *to = NULL; 670141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 671f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 672b6df4b79SXiubo Li struct page *page; 673f97ec7dbSIlias Tsitsimpis 674f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 67526418649SSheng Yang int sg_remaining = sg->length; 676f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 67726418649SSheng Yang while (sg_remaining > 0) { 67826418649SSheng Yang if (block_remaining == 0) { 679b6df4b79SXiubo Li if (to) 680b6df4b79SXiubo Li kunmap_atomic(to); 681b6df4b79SXiubo Li 68226418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 683b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 684b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 685b6df4b79SXiubo Li to = kmap_atomic(page); 686141685a3SXiubo Li } 687141685a3SXiubo Li 6883e609135SXiubo Li /* 6893e609135SXiubo Li * Covert to virtual offset of the ring data area. 6903e609135SXiubo Li */ 691141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 69226418649SSheng Yang block_remaining); 693141685a3SXiubo Li 6943e609135SXiubo Li /* 6953e609135SXiubo Li * The following code will gather and map the blocks 6963e609135SXiubo Li * to the same iovec when the blocks are all next to 6973e609135SXiubo Li * each other. 6983e609135SXiubo Li */ 6993e609135SXiubo Li copy_bytes = min_t(size_t, sg_remaining, 7003e609135SXiubo Li block_remaining); 70126418649SSheng Yang if (*iov_cnt != 0 && 702daf78c30SXiubo Li to_offset == iov_tail(*iov)) { 7033e609135SXiubo Li /* 7043e609135SXiubo Li * Will append to the current iovec, because 7053e609135SXiubo Li * the current block page is next to the 7063e609135SXiubo Li * previous one. 7073e609135SXiubo Li */ 708f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 70926418649SSheng Yang } else { 7103e609135SXiubo Li /* 7113e609135SXiubo Li * Will allocate a new iovec because we are 7123e609135SXiubo Li * first time here or the current block page 7133e609135SXiubo Li * is not next to the previous one. 7143e609135SXiubo Li */ 7153e609135SXiubo Li new_iov(iov, iov_cnt); 71626418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 717f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 71826418649SSheng Yang } 7193e609135SXiubo Li 720f97ec7dbSIlias Tsitsimpis if (copy_data) { 721c542942cSXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 722c542942cSXiubo Li memcpy(to + offset, 723c542942cSXiubo Li from + sg->length - sg_remaining, 72426418649SSheng Yang copy_bytes); 725f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, 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 734b6df4b79SXiubo Li if (to) 735b6df4b79SXiubo Li kunmap_atomic(to); 7360c28481fSSheng Yang } 7370c28481fSSheng Yang 738a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 7396c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 740f97ec7dbSIlias Tsitsimpis { 741a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 742141685a3SXiubo Li int i, dbi; 74326418649SSheng Yang int block_remaining = 0; 744b6df4b79SXiubo Li void *from = NULL, *to; 745141685a3SXiubo Li size_t copy_bytes, offset; 746a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 747b6df4b79SXiubo Li struct page *page; 748a5d68ba8SXiubo Li unsigned int data_nents; 749141685a3SXiubo Li uint32_t count = 0; 750a5d68ba8SXiubo Li 751a5d68ba8SXiubo Li if (!bidi) { 752a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 753a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 754a5d68ba8SXiubo Li } else { 755a5d68ba8SXiubo Li 756a5d68ba8SXiubo Li /* 757a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 758a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 759a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 760a5d68ba8SXiubo Li */ 761a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 762a5d68ba8SXiubo Li 763a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 764a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 765a5d68ba8SXiubo Li } 766f97ec7dbSIlias Tsitsimpis 767141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 768141685a3SXiubo Li 769f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 77026418649SSheng Yang int sg_remaining = sg->length; 771f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 7726c3796d1Sbstroesser@ts.fujitsu.com while (sg_remaining > 0 && read_len > 0) { 77326418649SSheng Yang if (block_remaining == 0) { 774b6df4b79SXiubo Li if (from) 775b6df4b79SXiubo Li kunmap_atomic(from); 776b6df4b79SXiubo Li 77726418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 778141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 779b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 780b6df4b79SXiubo Li from = kmap_atomic(page); 78126418649SSheng Yang } 78226418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 78326418649SSheng Yang block_remaining); 7846c3796d1Sbstroesser@ts.fujitsu.com if (read_len < copy_bytes) 7856c3796d1Sbstroesser@ts.fujitsu.com copy_bytes = read_len; 786141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 787f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 788c542942cSXiubo Li memcpy(to + sg->length - sg_remaining, from + offset, 78926418649SSheng Yang copy_bytes); 790f97ec7dbSIlias Tsitsimpis 79126418649SSheng Yang sg_remaining -= copy_bytes; 79226418649SSheng Yang block_remaining -= copy_bytes; 7936c3796d1Sbstroesser@ts.fujitsu.com read_len -= copy_bytes; 794f97ec7dbSIlias Tsitsimpis } 795e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 7966c3796d1Sbstroesser@ts.fujitsu.com if (read_len == 0) 7976c3796d1Sbstroesser@ts.fujitsu.com break; 798f97ec7dbSIlias Tsitsimpis } 799b6df4b79SXiubo Li if (from) 800b6df4b79SXiubo Li kunmap_atomic(from); 801f97ec7dbSIlias Tsitsimpis } 802f97ec7dbSIlias Tsitsimpis 803b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 80426418649SSheng Yang { 8053c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 80626418649SSheng Yang } 80726418649SSheng Yang 8087c9e7a6fSAndy Grover /* 809f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 8103d9b9555SAndy Grover * space available on the data area. 8117c9e7a6fSAndy Grover * 8127c9e7a6fSAndy Grover * Called with ring lock held. 8137c9e7a6fSAndy Grover */ 814b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 815b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 8167c9e7a6fSAndy Grover { 8177c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 818b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 819b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 8200241fd39SNicholas Bellinger size_t space, cmd_needed; 8217c9e7a6fSAndy Grover u32 cmd_head; 8227c9e7a6fSAndy Grover 8237c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8247c9e7a6fSAndy Grover 8257c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8267c9e7a6fSAndy Grover 827f56574a2SAndy Grover /* 828f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 829f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 830f56574a2SAndy Grover */ 831f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 832f56574a2SAndy Grover cmd_needed = cmd_size; 833f56574a2SAndy Grover else 834f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 835f56574a2SAndy Grover 8367c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8377c9e7a6fSAndy Grover if (space < cmd_needed) { 8387c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8397c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8407c9e7a6fSAndy Grover return false; 8417c9e7a6fSAndy Grover } 8427c9e7a6fSAndy Grover 843b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 844b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 8453c0f26ffSMike Christie if ((space * DATA_BLOCK_SIZE) < data_needed) { 84680eb8761SMike Christie unsigned long blocks_left = 84780eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 848b6df4b79SXiubo Li 849b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 850b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 851b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 852b6df4b79SXiubo Li data_needed); 8537c9e7a6fSAndy Grover return false; 8547c9e7a6fSAndy Grover } 8557c9e7a6fSAndy Grover 856f890f579SMike Christie udev->dbi_thresh += blocks_needed; 85780eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 85880eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 859b6df4b79SXiubo Li } 860b6df4b79SXiubo Li 861daf78c30SXiubo Li return tcmu_get_empty_blocks(udev, cmd); 8627c9e7a6fSAndy Grover } 8637c9e7a6fSAndy Grover 864fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 865fe25cc34SXiubo Li { 866fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 867fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 868fe25cc34SXiubo Li } 869fe25cc34SXiubo Li 870fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 871fe25cc34SXiubo Li size_t base_command_size) 872fe25cc34SXiubo Li { 873fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 874fe25cc34SXiubo Li size_t command_size; 875fe25cc34SXiubo Li 876fe25cc34SXiubo Li command_size = base_command_size + 877fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 878fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 879fe25cc34SXiubo Li 880fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 881fe25cc34SXiubo Li 882fe25cc34SXiubo Li return command_size; 883fe25cc34SXiubo Li } 884fe25cc34SXiubo Li 8859103575aSMike Christie static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8869103575aSMike Christie struct timer_list *timer) 8870d44374cSMike Christie { 8880d44374cSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 8890d44374cSMike Christie int cmd_id; 8900d44374cSMike Christie 8910d44374cSMike Christie if (tcmu_cmd->cmd_id) 8929103575aSMike Christie goto setup_timer; 8930d44374cSMike Christie 8940d44374cSMike Christie cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 8950d44374cSMike Christie if (cmd_id < 0) { 8960d44374cSMike Christie pr_err("tcmu: Could not allocate cmd id.\n"); 8970d44374cSMike Christie return cmd_id; 8980d44374cSMike Christie } 8990d44374cSMike Christie tcmu_cmd->cmd_id = cmd_id; 9000d44374cSMike Christie 901af1dd7ffSMike Christie pr_debug("allocated cmd %u for dev %s tmo %lu\n", tcmu_cmd->cmd_id, 902af1dd7ffSMike Christie udev->name, tmo / MSEC_PER_SEC); 9030d44374cSMike Christie 9049103575aSMike Christie setup_timer: 9059103575aSMike Christie if (!tmo) 9069103575aSMike Christie return 0; 9079103575aSMike Christie 9080d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 909a94a2572SXiubo Li if (!timer_pending(timer)) 9109103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 911a94a2572SXiubo Li 9120d44374cSMike Christie return 0; 9130d44374cSMike Christie } 9140d44374cSMike Christie 915a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 916af1dd7ffSMike Christie { 917af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9189103575aSMike Christie unsigned int tmo; 919af1dd7ffSMike Christie int ret; 920af1dd7ffSMike Christie 9219103575aSMike Christie /* 9229103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9239103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9249103575aSMike Christie */ 9259103575aSMike Christie if (!udev->qfull_time_out) 9269103575aSMike Christie return -ETIMEDOUT; 9279103575aSMike Christie else if (udev->qfull_time_out > 0) 9289103575aSMike Christie tmo = udev->qfull_time_out; 9299103575aSMike Christie else if (udev->cmd_time_out) 9309103575aSMike Christie tmo = udev->cmd_time_out; 9319103575aSMike Christie else 9329103575aSMike Christie tmo = TCMU_TIME_OUT; 9339103575aSMike Christie 9349103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 935af1dd7ffSMike Christie if (ret) 936af1dd7ffSMike Christie return ret; 937af1dd7ffSMike Christie 938a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 939af1dd7ffSMike Christie pr_debug("adding cmd %u on dev %s to ring space wait queue\n", 940af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 941af1dd7ffSMike Christie return 0; 942af1dd7ffSMike Christie } 943af1dd7ffSMike Christie 9446fd0ce79SMike Christie /** 9456fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9466fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9476fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9486fd0ce79SMike Christie * 9496fd0ce79SMike Christie * Returns: 9506fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9516fd0ce79SMike Christie * 0 success 952af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9536fd0ce79SMike Christie */ 954e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9557c9e7a6fSAndy Grover { 9567c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9577c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9587c9e7a6fSAndy Grover size_t base_command_size, command_size; 9597c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 9607c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 9617c9e7a6fSAndy Grover struct iovec *iov; 962141685a3SXiubo Li int iov_cnt, ret; 9637c9e7a6fSAndy Grover uint32_t cmd_head; 9647c9e7a6fSAndy Grover uint64_t cdb_off; 965f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 966ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 9677c9e7a6fSAndy Grover 9686fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 9696fd0ce79SMike Christie 970892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 971892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 972892782caSMike Christie return -1; 973892782caSMike Christie } 974892782caSMike Christie 9756fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 9766fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 9776fd0ce79SMike Christie return -1; 9786fd0ce79SMike Christie } 9797c9e7a6fSAndy Grover 9807c9e7a6fSAndy Grover /* 9817c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 9827c9e7a6fSAndy Grover * also may be larger if the iov array is large. 9837c9e7a6fSAndy Grover * 984fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 985fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 986fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 987fe25cc34SXiubo Li * will only be used to do the checks. 988fe25cc34SXiubo Li * 989fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 990fe25cc34SXiubo Li * cmd area memories. 9917c9e7a6fSAndy Grover */ 992fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 993fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 9947c9e7a6fSAndy Grover 995a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 996af1dd7ffSMike Christie goto queue; 9977c9e7a6fSAndy Grover 9987c9e7a6fSAndy Grover mb = udev->mb_addr; 9997c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 1000554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 1001554617b2SAndy Grover data_length > udev->data_size) { 1002554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 10033d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 10047c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 10056fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 10066fd0ce79SMike Christie return -1; 1007554617b2SAndy Grover } 10087c9e7a6fSAndy Grover 1009af1dd7ffSMike Christie if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 1010810b8153SMike Christie /* 1011810b8153SMike Christie * Don't leave commands partially setup because the unmap 1012810b8153SMike Christie * thread might need the blocks to make forward progress. 1013810b8153SMike Christie */ 1014810b8153SMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 1015810b8153SMike Christie tcmu_cmd_reset_dbi_cur(tcmu_cmd); 1016af1dd7ffSMike Christie goto queue; 10177c9e7a6fSAndy Grover } 10187c9e7a6fSAndy Grover 1019f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 1020f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 1021f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 1022f56574a2SAndy Grover 10237c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 10240ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 10250ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 10260ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 10270ad46af8SAndy Grover entry->hdr.kflags = 0; 10280ad46af8SAndy Grover entry->hdr.uflags = 0; 10299d62bc0eSXiubo Li tcmu_flush_dcache_range(entry, sizeof(*entry)); 10307c9e7a6fSAndy Grover 10317c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 10329d62bc0eSXiubo Li tcmu_flush_dcache_range(mb, sizeof(*mb)); 10337c9e7a6fSAndy Grover 10347c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 10357c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 10367c9e7a6fSAndy Grover } 10377c9e7a6fSAndy Grover 10387c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 1039b3743c71SXiubo Li memset(entry, 0, command_size); 10400ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10417c9e7a6fSAndy Grover 10423d9b9555SAndy Grover /* Handle allocating space from the data area */ 1043b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10447c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 1045f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 1046e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 1047e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 10481a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 1049b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 1050b6df4b79SXiubo Li copy_to_data_area); 10517c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 10527c9e7a6fSAndy Grover 1053e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 1054e4648b01SIlias Tsitsimpis iov_cnt = 0; 1055b3743c71SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 1056ab22d260SXiubo Li iov++; 10571a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, 10581a1fc0b8SMike Christie se_cmd->t_bidi_data_nents, &iov, &iov_cnt, 10591a1fc0b8SMike Christie false); 1060ab22d260SXiubo Li } 1061b3743c71SXiubo Li entry->req.iov_bidi_cnt = iov_cnt; 106226418649SSheng Yang 10639103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, 10649103575aSMike Christie &udev->cmd_timer); 10650d44374cSMike Christie if (ret) { 10660d44374cSMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10676fd0ce79SMike Christie 10686fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10696fd0ce79SMike Christie return -1; 10700d44374cSMike Christie } 10710d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10720d44374cSMike Christie 1073fe25cc34SXiubo Li /* 1074fe25cc34SXiubo Li * Recalaulate the command's base size and size according 1075fe25cc34SXiubo Li * to the actual needs 1076fe25cc34SXiubo Li */ 1077fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 1078fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 1079fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 1080fe25cc34SXiubo Li 1081fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1082fe25cc34SXiubo Li 10837c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 10847c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 10857c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 10867c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 10877c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 10887c9e7a6fSAndy Grover 10897c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 10907c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10917c9e7a6fSAndy Grover 1092a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1093a94a2572SXiubo Li set_bit(TCMU_CMD_BIT_INFLIGHT, &tcmu_cmd->flags); 1094a94a2572SXiubo Li 10957c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 10967c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 10977c9e7a6fSAndy Grover 10986fd0ce79SMike Christie return 0; 1099af1dd7ffSMike Christie 1100af1dd7ffSMike Christie queue: 1101a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1102af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1103af1dd7ffSMike Christie return -1; 1104af1dd7ffSMike Christie } 1105af1dd7ffSMike Christie 1106af1dd7ffSMike Christie return 1; 11077c9e7a6fSAndy Grover } 11087c9e7a6fSAndy Grover 110902eb924fSAndy Grover static sense_reason_t 111002eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11117c9e7a6fSAndy Grover { 1112af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1113af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11147c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 11156fd0ce79SMike Christie sense_reason_t scsi_ret; 1116af1dd7ffSMike Christie int ret; 11177c9e7a6fSAndy Grover 11187c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11197c9e7a6fSAndy Grover if (!tcmu_cmd) 112002eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11217c9e7a6fSAndy Grover 1122af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1123af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1124af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 1125af1dd7ffSMike Christie if (ret < 0) 1126141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 11276fd0ce79SMike Christie return scsi_ret; 11287c9e7a6fSAndy Grover } 11297c9e7a6fSAndy Grover 11307c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 11317c9e7a6fSAndy Grover { 11327c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 11337c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 11346c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 11356c3796d1Sbstroesser@ts.fujitsu.com uint32_t read_len = se_cmd->data_length; 11367c9e7a6fSAndy Grover 1137b25c7863SSheng Yang /* 1138b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 11393d9b9555SAndy Grover * data area space and free cmd 1140b25c7863SSheng Yang */ 1141141685a3SXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 1142141685a3SXiubo Li goto out; 1143b25c7863SSheng Yang 1144a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1145a94a2572SXiubo Li 1146141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 11477c9e7a6fSAndy Grover 11480ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 11490ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 11500ad46af8SAndy Grover cmd->se_cmd); 1151ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 11526c3796d1Sbstroesser@ts.fujitsu.com goto done; 11536c3796d1Sbstroesser@ts.fujitsu.com } 11546c3796d1Sbstroesser@ts.fujitsu.com 11556c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 11566c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 11576c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 11586c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 11596c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 11606c3796d1Sbstroesser@ts.fujitsu.com } 11616c3796d1Sbstroesser@ts.fujitsu.com 11626c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1163406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 11646c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 11656c3796d1Sbstroesser@ts.fujitsu.com goto done; 11666c3796d1Sbstroesser@ts.fujitsu.com else 11676c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 11686c3796d1Sbstroesser@ts.fujitsu.com } 11696c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 117026418649SSheng Yang /* Get Data-In buffer before clean up */ 11716c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1172e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 11736c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 11747c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1175141685a3SXiubo Li /* TODO: */ 11762bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 11772bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 11782bc396a2SIlias Tsitsimpis se_cmd->data_direction); 11797c9e7a6fSAndy Grover } 11807c9e7a6fSAndy Grover 11816c3796d1Sbstroesser@ts.fujitsu.com done: 11826c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 11836c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 11846c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 11856c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 11866c3796d1Sbstroesser@ts.fujitsu.com } else 11877c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 11887c9e7a6fSAndy Grover 1189141685a3SXiubo Li out: 1190141685a3SXiubo Li cmd->se_cmd = NULL; 1191b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1192141685a3SXiubo Li tcmu_free_cmd(cmd); 11937c9e7a6fSAndy Grover } 11947c9e7a6fSAndy Grover 1195a94a2572SXiubo Li static void tcmu_set_next_deadline(struct list_head *queue, 1196a94a2572SXiubo Li struct timer_list *timer) 1197a94a2572SXiubo Li { 1198a94a2572SXiubo Li struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1199a94a2572SXiubo Li unsigned long deadline = 0; 1200a94a2572SXiubo Li 1201a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, queue, queue_entry) { 1202a94a2572SXiubo Li if (!time_after(jiffies, tcmu_cmd->deadline)) { 1203a94a2572SXiubo Li deadline = tcmu_cmd->deadline; 1204a94a2572SXiubo Li break; 1205a94a2572SXiubo Li } 1206a94a2572SXiubo Li } 1207a94a2572SXiubo Li 1208a94a2572SXiubo Li if (deadline) 1209a94a2572SXiubo Li mod_timer(timer, deadline); 1210a94a2572SXiubo Li else 1211a94a2572SXiubo Li del_timer(timer); 1212a94a2572SXiubo Li } 1213a94a2572SXiubo Li 12147c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 12157c9e7a6fSAndy Grover { 12167c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1217a94a2572SXiubo Li struct tcmu_cmd *cmd; 12187c9e7a6fSAndy Grover int handled = 0; 12197c9e7a6fSAndy Grover 12207c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 12217c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 12227c9e7a6fSAndy Grover return 0; 12237c9e7a6fSAndy Grover } 12247c9e7a6fSAndy Grover 12257c9e7a6fSAndy Grover mb = udev->mb_addr; 12267c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 12277c9e7a6fSAndy Grover 12286aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 12297c9e7a6fSAndy Grover 12307c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 12317c9e7a6fSAndy Grover 12327c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 12337c9e7a6fSAndy Grover 12340ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 12350ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12360ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12370ad46af8SAndy Grover udev->cmdr_size); 12387c9e7a6fSAndy Grover continue; 12397c9e7a6fSAndy Grover } 12400ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 12417c9e7a6fSAndy Grover 1242d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 12437c9e7a6fSAndy Grover if (!cmd) { 124488cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 124588cf1073SMike Christie entry->hdr.cmd_id); 12467c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 12477c9e7a6fSAndy Grover break; 12487c9e7a6fSAndy Grover } 12497c9e7a6fSAndy Grover 12507c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 12517c9e7a6fSAndy Grover 12520ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12530ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12540ad46af8SAndy Grover udev->cmdr_size); 12557c9e7a6fSAndy Grover 12567c9e7a6fSAndy Grover handled++; 12577c9e7a6fSAndy Grover } 12587c9e7a6fSAndy Grover 12599103575aSMike Christie if (mb->cmd_tail == mb->cmd_head) { 12609103575aSMike Christie /* no more pending commands */ 12619103575aSMike Christie del_timer(&udev->cmd_timer); 12629103575aSMike Christie 1263a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) { 1264af1dd7ffSMike Christie /* 12659103575aSMike Christie * no more pending or waiting commands so try to 12669103575aSMike Christie * reclaim blocks if needed. 1267af1dd7ffSMike Christie */ 12689103575aSMike Christie if (atomic_read(&global_db_count) > 126980eb8761SMike Christie tcmu_global_max_blocks) 1270af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1271af1dd7ffSMike Christie } 1272a94a2572SXiubo Li } else if (udev->cmd_time_out) { 1273a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 12749103575aSMike Christie } 12757c9e7a6fSAndy Grover 12767c9e7a6fSAndy Grover return handled; 12777c9e7a6fSAndy Grover } 12787c9e7a6fSAndy Grover 12797c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 12807c9e7a6fSAndy Grover { 12817c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 1282af1dd7ffSMike Christie struct tcmu_dev *udev = cmd->tcmu_dev; 1283af1dd7ffSMike Christie u8 scsi_status; 1284af1dd7ffSMike Christie struct se_cmd *se_cmd; 1285af1dd7ffSMike Christie bool is_running; 12867c9e7a6fSAndy Grover 12877c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 12887c9e7a6fSAndy Grover return 0; 12897c9e7a6fSAndy Grover 1290611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 12917c9e7a6fSAndy Grover return 0; 12927c9e7a6fSAndy Grover 1293a94a2572SXiubo Li is_running = test_bit(TCMU_CMD_BIT_INFLIGHT, &cmd->flags); 129445dc488cSMike Christie se_cmd = cmd->se_cmd; 12957c9e7a6fSAndy Grover 1296af1dd7ffSMike Christie if (is_running) { 12979103575aSMike Christie /* 12989103575aSMike Christie * If cmd_time_out is disabled but qfull is set deadline 12999103575aSMike Christie * will only reflect the qfull timeout. Ignore it. 13009103575aSMike Christie */ 13019103575aSMike Christie if (!udev->cmd_time_out) 13029103575aSMike Christie return 0; 13039103575aSMike Christie 1304af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 1305af1dd7ffSMike Christie /* 1306af1dd7ffSMike Christie * target_complete_cmd will translate this to LUN COMM FAILURE 1307af1dd7ffSMike Christie */ 1308af1dd7ffSMike Christie scsi_status = SAM_STAT_CHECK_CONDITION; 130940d883b0SXiubo Li list_del_init(&cmd->queue_entry); 1310af1dd7ffSMike Christie } else { 131140d883b0SXiubo Li list_del_init(&cmd->queue_entry); 1312af1dd7ffSMike Christie idr_remove(&udev->commands, id); 1313af1dd7ffSMike Christie tcmu_free_cmd(cmd); 1314af1dd7ffSMike Christie scsi_status = SAM_STAT_TASK_SET_FULL; 1315af1dd7ffSMike Christie } 13169103575aSMike Christie 13179103575aSMike Christie pr_debug("Timing out cmd %u on dev %s that is %s.\n", 13189103575aSMike Christie id, udev->name, is_running ? "inflight" : "queued"); 13199103575aSMike Christie 1320af1dd7ffSMike Christie target_complete_cmd(se_cmd, scsi_status); 13217c9e7a6fSAndy Grover return 0; 13227c9e7a6fSAndy Grover } 13237c9e7a6fSAndy Grover 13249103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 13257c9e7a6fSAndy Grover { 1326488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1327488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1328488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1329488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 13307c9e7a6fSAndy Grover 1331af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 13327c9e7a6fSAndy Grover } 13337c9e7a6fSAndy Grover 13349103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 13359103575aSMike Christie { 13369103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 13379103575aSMike Christie 13389103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 13399103575aSMike Christie tcmu_device_timedout(udev); 13409103575aSMike Christie } 13419103575aSMike Christie 13429103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 13439103575aSMike Christie { 13449103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 13459103575aSMike Christie 13469103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 13479103575aSMike Christie tcmu_device_timedout(udev); 13489103575aSMike Christie } 13499103575aSMike Christie 13507c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 13517c9e7a6fSAndy Grover { 13527c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 13537c9e7a6fSAndy Grover 13547c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 13557c9e7a6fSAndy Grover if (!tcmu_hba) 13567c9e7a6fSAndy Grover return -ENOMEM; 13577c9e7a6fSAndy Grover 13587c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 13597c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 13607c9e7a6fSAndy Grover 13617c9e7a6fSAndy Grover return 0; 13627c9e7a6fSAndy Grover } 13637c9e7a6fSAndy Grover 13647c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 13657c9e7a6fSAndy Grover { 13667c9e7a6fSAndy Grover kfree(hba->hba_ptr); 13677c9e7a6fSAndy Grover hba->hba_ptr = NULL; 13687c9e7a6fSAndy Grover } 13697c9e7a6fSAndy Grover 13707c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 13717c9e7a6fSAndy Grover { 13727c9e7a6fSAndy Grover struct tcmu_dev *udev; 13737c9e7a6fSAndy Grover 13747c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 13757c9e7a6fSAndy Grover if (!udev) 13767c9e7a6fSAndy Grover return NULL; 1377f3cdbe39SMike Christie kref_init(&udev->kref); 13787c9e7a6fSAndy Grover 13797c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 13807c9e7a6fSAndy Grover if (!udev->name) { 13817c9e7a6fSAndy Grover kfree(udev); 13827c9e7a6fSAndy Grover return NULL; 13837c9e7a6fSAndy Grover } 13847c9e7a6fSAndy Grover 13857c9e7a6fSAndy Grover udev->hba = hba; 1386af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 13879103575aSMike Christie udev->qfull_time_out = -1; 13887c9e7a6fSAndy Grover 138980eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1390b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 13917c9e7a6fSAndy Grover 1392ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1393488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1394a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1395a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 13967c9e7a6fSAndy Grover idr_init(&udev->commands); 13977c9e7a6fSAndy Grover 13989103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 13999103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 14007c9e7a6fSAndy Grover 1401c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1402c22adc0bSXiubo Li 14037c9e7a6fSAndy Grover return &udev->se_dev; 14047c9e7a6fSAndy Grover } 14057c9e7a6fSAndy Grover 1406a94a2572SXiubo Li static bool run_qfull_queue(struct tcmu_dev *udev, bool fail) 1407af1dd7ffSMike Christie { 1408af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1409af1dd7ffSMike Christie LIST_HEAD(cmds); 1410af1dd7ffSMike Christie bool drained = true; 1411af1dd7ffSMike Christie sense_reason_t scsi_ret; 1412af1dd7ffSMike Christie int ret; 1413af1dd7ffSMike Christie 1414a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 1415af1dd7ffSMike Christie return true; 1416af1dd7ffSMike Christie 1417892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1418af1dd7ffSMike Christie 1419a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1420af1dd7ffSMike Christie 1421a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1422a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1423af1dd7ffSMike Christie 1424af1dd7ffSMike Christie pr_debug("removing cmd %u on dev %s from queue\n", 1425af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 1426af1dd7ffSMike Christie 1427892782caSMike Christie if (fail) { 1428892782caSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1429892782caSMike Christie /* 1430892782caSMike Christie * We were not able to even start the command, so 1431892782caSMike Christie * fail with busy to allow a retry in case runner 1432892782caSMike Christie * was only temporarily down. If the device is being 1433892782caSMike Christie * removed then LIO core will do the right thing and 1434892782caSMike Christie * fail the retry. 1435892782caSMike Christie */ 1436892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1437892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1438892782caSMike Christie continue; 1439892782caSMike Christie } 1440892782caSMike Christie 1441af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1442af1dd7ffSMike Christie if (ret < 0) { 1443af1dd7ffSMike Christie pr_debug("cmd %u on dev %s failed with %u\n", 1444af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name, scsi_ret); 1445af1dd7ffSMike Christie 1446af1dd7ffSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1447af1dd7ffSMike Christie /* 1448af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1449af1dd7ffSMike Christie * drops it. 1450af1dd7ffSMike Christie */ 1451af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1452af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1453af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1454af1dd7ffSMike Christie } else if (ret > 0) { 1455af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1456af1dd7ffSMike Christie /* 1457af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1458af1dd7ffSMike Christie * the queue 1459af1dd7ffSMike Christie */ 1460a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1461af1dd7ffSMike Christie drained = false; 1462a94a2572SXiubo Li break; 1463af1dd7ffSMike Christie } 1464af1dd7ffSMike Christie } 1465a94a2572SXiubo Li 1466a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1467af1dd7ffSMike Christie return drained; 1468af1dd7ffSMike Christie } 1469af1dd7ffSMike Christie 14707c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 14717c9e7a6fSAndy Grover { 1472af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14737c9e7a6fSAndy Grover 1474af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1475af1dd7ffSMike Christie tcmu_handle_completions(udev); 1476a94a2572SXiubo Li run_qfull_queue(udev, false); 1477af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 14787c9e7a6fSAndy Grover 14797c9e7a6fSAndy Grover return 0; 14807c9e7a6fSAndy Grover } 14817c9e7a6fSAndy Grover 14827c9e7a6fSAndy Grover /* 14837c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 14847c9e7a6fSAndy Grover * and this stuff must come along. 14857c9e7a6fSAndy Grover */ 14867c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 14877c9e7a6fSAndy Grover { 14887c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 14897c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 14907c9e7a6fSAndy Grover 14917c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 14927c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 14937c9e7a6fSAndy Grover return -1; 14947c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 14957c9e7a6fSAndy Grover } 14967c9e7a6fSAndy Grover return -1; 14977c9e7a6fSAndy Grover } 14987c9e7a6fSAndy Grover 1499b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1500b6df4b79SXiubo Li { 1501b6df4b79SXiubo Li struct page *page; 1502b6df4b79SXiubo Li 1503b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1504b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1505b6df4b79SXiubo Li if (likely(page)) { 1506b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1507b6df4b79SXiubo Li return page; 1508b6df4b79SXiubo Li } 1509b6df4b79SXiubo Li 1510b6df4b79SXiubo Li /* 1511c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1512c1c390baSMike Christie * data iov passed to it. 1513b6df4b79SXiubo Li */ 1514c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1515c1c390baSMike Christie dbi, udev->name); 1516c1c390baSMike Christie page = NULL; 1517b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1518b6df4b79SXiubo Li 1519b6df4b79SXiubo Li return page; 1520b6df4b79SXiubo Li } 1521b6df4b79SXiubo Li 152269589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 15237c9e7a6fSAndy Grover { 152411bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 15257c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 15267c9e7a6fSAndy Grover struct page *page; 15277c9e7a6fSAndy Grover unsigned long offset; 15287c9e7a6fSAndy Grover void *addr; 15297c9e7a6fSAndy Grover 153011bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 15317c9e7a6fSAndy Grover if (mi < 0) 15327c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 15337c9e7a6fSAndy Grover 15347c9e7a6fSAndy Grover /* 15357c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 15367c9e7a6fSAndy Grover * to use mem[N]. 15377c9e7a6fSAndy Grover */ 15387c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 15397c9e7a6fSAndy Grover 1540141685a3SXiubo Li if (offset < udev->data_off) { 1541141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 15427c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 15437c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1544141685a3SXiubo Li } else { 1545141685a3SXiubo Li uint32_t dbi; 1546141685a3SXiubo Li 1547b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1548141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1549b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1550b6df4b79SXiubo Li if (!page) 1551c1c390baSMike Christie return VM_FAULT_SIGBUS; 1552141685a3SXiubo Li } 1553141685a3SXiubo Li 15547c9e7a6fSAndy Grover get_page(page); 15557c9e7a6fSAndy Grover vmf->page = page; 15567c9e7a6fSAndy Grover return 0; 15577c9e7a6fSAndy Grover } 15587c9e7a6fSAndy Grover 15597c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 15607c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 15617c9e7a6fSAndy Grover }; 15627c9e7a6fSAndy Grover 15637c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 15647c9e7a6fSAndy Grover { 15657c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15667c9e7a6fSAndy Grover 15677c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 15687c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 15697c9e7a6fSAndy Grover 15707c9e7a6fSAndy Grover vma->vm_private_data = udev; 15717c9e7a6fSAndy Grover 15727c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 157380eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 15747c9e7a6fSAndy Grover return -EINVAL; 15757c9e7a6fSAndy Grover 15767c9e7a6fSAndy Grover return 0; 15777c9e7a6fSAndy Grover } 15787c9e7a6fSAndy Grover 15797c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 15807c9e7a6fSAndy Grover { 15817c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15827c9e7a6fSAndy Grover 15837c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 15847c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 15857c9e7a6fSAndy Grover return -EBUSY; 15867c9e7a6fSAndy Grover 1587b6df4b79SXiubo Li udev->inode = inode; 15889260695dSMike Christie kref_get(&udev->kref); 1589b6df4b79SXiubo Li 15907c9e7a6fSAndy Grover pr_debug("open\n"); 15917c9e7a6fSAndy Grover 15927c9e7a6fSAndy Grover return 0; 15937c9e7a6fSAndy Grover } 15947c9e7a6fSAndy Grover 1595f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1596f3cdbe39SMike Christie { 1597f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1598f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1599f3cdbe39SMike Christie 1600f3cdbe39SMike Christie kfree(udev->uio_info.name); 1601f3cdbe39SMike Christie kfree(udev->name); 1602f3cdbe39SMike Christie kfree(udev); 1603f3cdbe39SMike Christie } 1604f3cdbe39SMike Christie 1605c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1606c22adc0bSXiubo Li { 1607c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1608c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1609c22adc0bSXiubo Li return 0; 1610c22adc0bSXiubo Li } 1611c22adc0bSXiubo Li return -EINVAL; 1612c22adc0bSXiubo Li } 1613c22adc0bSXiubo Li 1614bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1615bf99ec13SMike Christie int start, int end) 1616c22adc0bSXiubo Li { 1617c22adc0bSXiubo Li int i; 1618c22adc0bSXiubo Li struct page *page; 1619c22adc0bSXiubo Li 1620bf99ec13SMike Christie for (i = start; i < end; i++) { 1621bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1622c22adc0bSXiubo Li if (page) { 1623c22adc0bSXiubo Li __free_page(page); 1624c22adc0bSXiubo Li atomic_dec(&global_db_count); 1625c22adc0bSXiubo Li } 1626c22adc0bSXiubo Li } 1627c22adc0bSXiubo Li } 1628c22adc0bSXiubo Li 1629f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1630f3cdbe39SMike Christie { 1631f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1632f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1633c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1634c22adc0bSXiubo Li bool all_expired = true; 1635c22adc0bSXiubo Li int i; 1636c22adc0bSXiubo Li 1637c22adc0bSXiubo Li vfree(udev->mb_addr); 1638c22adc0bSXiubo Li udev->mb_addr = NULL; 1639c22adc0bSXiubo Li 1640488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1641488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1642488ebe4cSMike Christie list_del(&udev->timedout_entry); 1643488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1644488ebe4cSMike Christie 1645c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 16466fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1647c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1648c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1649c22adc0bSXiubo Li all_expired = false; 1650c22adc0bSXiubo Li } 1651c22adc0bSXiubo Li idr_destroy(&udev->commands); 1652c22adc0bSXiubo Li WARN_ON(!all_expired); 1653c22adc0bSXiubo Li 1654bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 165598effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 1656bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1657f3cdbe39SMike Christie 1658f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1659f3cdbe39SMike Christie } 1660f3cdbe39SMike Christie 16617c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 16627c9e7a6fSAndy Grover { 16637c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 16647c9e7a6fSAndy Grover 16657c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 16667c9e7a6fSAndy Grover 16677c9e7a6fSAndy Grover pr_debug("close\n"); 16689260695dSMike Christie /* release ref from open */ 1669f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 16707c9e7a6fSAndy Grover return 0; 16717c9e7a6fSAndy Grover } 16727c9e7a6fSAndy Grover 16739de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1674b3af66e2SMike Christie { 1675b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1676b3af66e2SMike Christie 1677b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 16789de3a1efSMike Christie return 0; 1679b849b456SKenjiro Nakayama 1680b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 16819de3a1efSMike Christie return 0; 1682b849b456SKenjiro Nakayama 16833228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1684b3af66e2SMike Christie 1685bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1686bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1687bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1688bdaeedc1SMike Christie udev->name); 1689bdaeedc1SMike Christie return -EAGAIN; 1690bdaeedc1SMike Christie } 1691b3af66e2SMike Christie 1692b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 16933228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 16949de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 16959de3a1efSMike Christie nl_cmd->cmd, udev->name); 16969de3a1efSMike Christie return -EBUSY; 1697b3af66e2SMike Christie } 1698b3af66e2SMike Christie 1699b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1700b3af66e2SMike Christie nl_cmd->cmd = cmd; 17013228691fSMike Christie nl_cmd->udev = udev; 1702b3af66e2SMike Christie init_completion(&nl_cmd->complete); 17033228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1704b3af66e2SMike Christie 17053228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 17063228691fSMike Christie 17073228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 17089de3a1efSMike Christie return 0; 1709b3af66e2SMike Christie } 1710b3af66e2SMike Christie 1711b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1712b3af66e2SMike Christie { 1713b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1714b3af66e2SMike Christie int ret; 1715b3af66e2SMike Christie 1716b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1717b3af66e2SMike Christie return 0; 1718b3af66e2SMike Christie 1719b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1720b849b456SKenjiro Nakayama return 0; 1721b849b456SKenjiro Nakayama 1722b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1723b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1724b3af66e2SMike Christie 17253228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1726b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1727b3af66e2SMike Christie ret = nl_cmd->status; 17283228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1729b3af66e2SMike Christie 173085fae482SLuis de Bethencourt return ret; 1731b3af66e2SMike Christie } 1732b3af66e2SMike Christie 17330e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 17340e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 17350e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 17367c9e7a6fSAndy Grover { 17377c9e7a6fSAndy Grover struct sk_buff *skb; 17387c9e7a6fSAndy Grover void *msg_header; 17396e14eab9SNicholas Bellinger int ret = -ENOMEM; 17407c9e7a6fSAndy Grover 17417c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 17427c9e7a6fSAndy Grover if (!skb) 17436e14eab9SNicholas Bellinger return ret; 17447c9e7a6fSAndy Grover 17457c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 17466e14eab9SNicholas Bellinger if (!msg_header) 17476e14eab9SNicholas Bellinger goto free_skb; 17487c9e7a6fSAndy Grover 1749b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 17506e14eab9SNicholas Bellinger if (ret < 0) 17516e14eab9SNicholas Bellinger goto free_skb; 17527c9e7a6fSAndy Grover 1753b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1754b3af66e2SMike Christie if (ret < 0) 1755b3af66e2SMike Christie goto free_skb; 1756b3af66e2SMike Christie 1757b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 17586e14eab9SNicholas Bellinger if (ret < 0) 17596e14eab9SNicholas Bellinger goto free_skb; 17607c9e7a6fSAndy Grover 17610e5aee39SZhu Lingshan *buf = skb; 17620e5aee39SZhu Lingshan *hdr = msg_header; 17630e5aee39SZhu Lingshan return ret; 17640e5aee39SZhu Lingshan 17650e5aee39SZhu Lingshan free_skb: 17660e5aee39SZhu Lingshan nlmsg_free(skb); 17670e5aee39SZhu Lingshan return ret; 17682d76443eSMike Christie } 17692d76443eSMike Christie 17700e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 17710e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 177206add777SMike Christie struct sk_buff *skb, void *msg_header) 17730e5aee39SZhu Lingshan { 177406add777SMike Christie int ret; 17758a45885cSBryant G. Ly 1776053c095aSJohannes Berg genlmsg_end(skb, msg_header); 17777c9e7a6fSAndy Grover 17789de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 17799de3a1efSMike Christie if (ret) { 17809de3a1efSMike Christie nlmsg_free(skb); 17819de3a1efSMike Christie return ret; 17829de3a1efSMike Christie } 1783b3af66e2SMike Christie 178420c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 17857c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 17862ff717cdSCathy Avery 17872ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 17882ff717cdSCathy Avery if (ret == 0 || 17892ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 17902ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 17912ff717cdSCathy Avery 17920e5aee39SZhu Lingshan return ret; 17930e5aee39SZhu Lingshan } 17947c9e7a6fSAndy Grover 1795e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 1796e0c240acSZhu Lingshan { 1797e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 1798e0c240acSZhu Lingshan void *msg_header = NULL; 1799e0c240acSZhu Lingshan int ret = 0; 1800e0c240acSZhu Lingshan 1801e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 1802e0c240acSZhu Lingshan &msg_header); 1803e0c240acSZhu Lingshan if (ret < 0) 18047c9e7a6fSAndy Grover return ret; 180506add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 180606add777SMike Christie msg_header); 1807e0c240acSZhu Lingshan } 1808e0c240acSZhu Lingshan 1809f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 1810f892bd8eSZhu Lingshan { 1811f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 1812f892bd8eSZhu Lingshan void *msg_header = NULL; 1813f892bd8eSZhu Lingshan int ret = 0; 1814f892bd8eSZhu Lingshan 1815f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 1816f892bd8eSZhu Lingshan &skb, &msg_header); 1817f892bd8eSZhu Lingshan if (ret < 0) 18186e14eab9SNicholas Bellinger return ret; 1819f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 182006add777SMike Christie skb, msg_header); 18217c9e7a6fSAndy Grover } 18227c9e7a6fSAndy Grover 1823de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 18247c9e7a6fSAndy Grover { 18257c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 18267c9e7a6fSAndy Grover struct uio_info *info; 1827de8c5221SBryant G. Ly size_t size, used; 18287c9e7a6fSAndy Grover char *str; 18297c9e7a6fSAndy Grover 18307c9e7a6fSAndy Grover info = &udev->uio_info; 18317c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 18327c9e7a6fSAndy Grover udev->dev_config); 18337c9e7a6fSAndy Grover size += 1; /* for \0 */ 18347c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 18357c9e7a6fSAndy Grover if (!str) 18367c9e7a6fSAndy Grover return -ENOMEM; 18377c9e7a6fSAndy Grover 18387c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 18397c9e7a6fSAndy Grover if (udev->dev_config[0]) 18407c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 18417c9e7a6fSAndy Grover 1842ededd039SBryant G. Ly /* If the old string exists, free it */ 1843ededd039SBryant G. Ly kfree(info->name); 18447c9e7a6fSAndy Grover info->name = str; 18457c9e7a6fSAndy Grover 1846de8c5221SBryant G. Ly return 0; 1847de8c5221SBryant G. Ly } 1848de8c5221SBryant G. Ly 1849de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 1850de8c5221SBryant G. Ly { 1851de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 1852de8c5221SBryant G. Ly struct uio_info *info; 1853de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 1854de8c5221SBryant G. Ly int ret = 0; 1855de8c5221SBryant G. Ly 1856de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1857de8c5221SBryant G. Ly if (ret) 1858de8c5221SBryant G. Ly return ret; 1859de8c5221SBryant G. Ly 1860de8c5221SBryant G. Ly info = &udev->uio_info; 1861de8c5221SBryant G. Ly 1862c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 186398effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 1864c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 1865a24e7917SWei Yongjun if (!udev->data_bitmap) { 1866a24e7917SWei Yongjun ret = -ENOMEM; 186780eb8761SMike Christie goto err_bitmap_alloc; 1868a24e7917SWei Yongjun } 186980eb8761SMike Christie 1870141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 18717c9e7a6fSAndy Grover if (!udev->mb_addr) { 18727c9e7a6fSAndy Grover ret = -ENOMEM; 18737c9e7a6fSAndy Grover goto err_vzalloc; 18747c9e7a6fSAndy Grover } 18757c9e7a6fSAndy Grover 18767c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 18777c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 18787c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 187980eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 1880b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 18817c9e7a6fSAndy Grover 1882141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 18837c9e7a6fSAndy Grover mb = udev->mb_addr; 18840ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 18856c3796d1Sbstroesser@ts.fujitsu.com mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | TCMU_MAILBOX_FLAG_CAP_READ_LEN; 18867c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 18877c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 18887c9e7a6fSAndy Grover 18897c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 18907c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 189126418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 18927c9e7a6fSAndy Grover 1893ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 18947c9e7a6fSAndy Grover 18957c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 18960633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 189780eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 1898141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 18997c9e7a6fSAndy Grover 19007c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 19017c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 19027c9e7a6fSAndy Grover 19037c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 19047c9e7a6fSAndy Grover info->open = tcmu_open; 19057c9e7a6fSAndy Grover info->release = tcmu_release; 19067c9e7a6fSAndy Grover 19077c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 19087c9e7a6fSAndy Grover if (ret) 19097c9e7a6fSAndy Grover goto err_register; 19107c9e7a6fSAndy Grover 191181ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 191281ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 19137c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 191481ee28deSSheng Yang /* Other attributes can be configured in userspace */ 19153abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 19167c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 19179a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 19189a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 19197c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 19207c9e7a6fSAndy Grover 1921b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 1922b849b456SKenjiro Nakayama * module scope setting. 1923b849b456SKenjiro Nakayama */ 1924b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 1925b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 1926b849b456SKenjiro Nakayama 1927f3cdbe39SMike Christie /* 1928f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1929f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1930f3cdbe39SMike Christie */ 1931f3cdbe39SMike Christie kref_get(&udev->kref); 1932f3cdbe39SMike Christie 1933e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 19347c9e7a6fSAndy Grover if (ret) 19357c9e7a6fSAndy Grover goto err_netlink; 19367c9e7a6fSAndy Grover 1937b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1938b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1939b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1940b6df4b79SXiubo Li 19417c9e7a6fSAndy Grover return 0; 19427c9e7a6fSAndy Grover 19437c9e7a6fSAndy Grover err_netlink: 1944f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19457c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19467c9e7a6fSAndy Grover err_register: 19477c9e7a6fSAndy Grover vfree(udev->mb_addr); 1948c22adc0bSXiubo Li udev->mb_addr = NULL; 19497c9e7a6fSAndy Grover err_vzalloc: 195098effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 195180eb8761SMike Christie udev->data_bitmap = NULL; 195280eb8761SMike Christie err_bitmap_alloc: 19537c9e7a6fSAndy Grover kfree(info->name); 1954f3cdbe39SMike Christie info->name = NULL; 19557c9e7a6fSAndy Grover 19567c9e7a6fSAndy Grover return ret; 19577c9e7a6fSAndy Grover } 19587c9e7a6fSAndy Grover 19597c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 19607c9e7a6fSAndy Grover { 19617c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 196292634706SMike Christie 196392634706SMike Christie /* release ref from init */ 196492634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 196592634706SMike Christie } 196692634706SMike Christie 196792634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 196892634706SMike Christie { 196992634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 19707c9e7a6fSAndy Grover 19719103575aSMike Christie del_timer_sync(&udev->cmd_timer); 19729103575aSMike Christie del_timer_sync(&udev->qfull_timer); 19737c9e7a6fSAndy Grover 1974b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1975b6df4b79SXiubo Li list_del(&udev->node); 1976b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1977b6df4b79SXiubo Li 1978f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 19797c9e7a6fSAndy Grover 19807c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19819260695dSMike Christie 19829260695dSMike Christie /* release ref from configure */ 19839260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19847c9e7a6fSAndy Grover } 19857c9e7a6fSAndy Grover 1986892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 1987892782caSMike Christie { 1988892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1989892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 1990892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 1991892782caSMike Christie } 1992892782caSMike Christie 1993892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 1994892782caSMike Christie { 1995892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1996892782caSMike Christie 1997892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 1998892782caSMike Christie goto unlock; 1999892782caSMike Christie 2000892782caSMike Christie /* complete IO that has executed successfully */ 2001892782caSMike Christie tcmu_handle_completions(udev); 2002892782caSMike Christie /* fail IO waiting to be queued */ 2003a94a2572SXiubo Li run_qfull_queue(udev, true); 2004892782caSMike Christie 2005892782caSMike Christie unlock: 2006892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2007892782caSMike Christie } 2008892782caSMike Christie 2009892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2010892782caSMike Christie { 2011892782caSMike Christie struct tcmu_mailbox *mb; 2012892782caSMike Christie struct tcmu_cmd *cmd; 2013892782caSMike Christie int i; 2014892782caSMike Christie 2015892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2016892782caSMike Christie 2017892782caSMike Christie idr_for_each_entry(&udev->commands, cmd, i) { 2018a94a2572SXiubo Li if (!test_bit(TCMU_CMD_BIT_INFLIGHT, &cmd->flags)) 2019892782caSMike Christie continue; 2020892782caSMike Christie 2021892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2022892782caSMike Christie cmd->cmd_id, udev->name, 2023892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2024892782caSMike Christie 2025892782caSMike Christie idr_remove(&udev->commands, i); 2026892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2027a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2028892782caSMike Christie if (err_level == 1) { 2029892782caSMike Christie /* 2030892782caSMike Christie * Userspace was not able to start the 2031892782caSMike Christie * command or it is retryable. 2032892782caSMike Christie */ 2033892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2034892782caSMike Christie } else { 2035892782caSMike Christie /* hard failure */ 2036892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2037892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2038892782caSMike Christie } 2039892782caSMike Christie } 2040892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2041892782caSMike Christie tcmu_free_cmd(cmd); 2042892782caSMike Christie } 2043892782caSMike Christie 2044892782caSMike Christie mb = udev->mb_addr; 2045892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2046892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2047892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2048892782caSMike Christie 2049892782caSMike Christie udev->cmdr_last_cleaned = 0; 2050892782caSMike Christie mb->cmd_tail = 0; 2051892782caSMike Christie mb->cmd_head = 0; 2052892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2053892782caSMike Christie 2054892782caSMike Christie del_timer(&udev->cmd_timer); 2055892782caSMike Christie 2056892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2057892782caSMike Christie } 2058892782caSMike Christie 20597c9e7a6fSAndy Grover enum { 20603abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 206180eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 20627c9e7a6fSAndy Grover }; 20637c9e7a6fSAndy Grover 20647c9e7a6fSAndy Grover static match_table_t tokens = { 20657c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 20660e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2067b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2068b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2069b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2070c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 20717c9e7a6fSAndy Grover {Opt_err, NULL} 20727c9e7a6fSAndy Grover }; 20737c9e7a6fSAndy Grover 20743abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 20753abaa2bfSMike Christie { 2076b60cb1f8SMike Christie int val, ret; 20773abaa2bfSMike Christie 2078b60cb1f8SMike Christie ret = match_int(arg, &val); 20793abaa2bfSMike Christie if (ret < 0) { 2080b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2081b60cb1f8SMike Christie ret); 20823abaa2bfSMike Christie return ret; 20833abaa2bfSMike Christie } 2084b60cb1f8SMike Christie 2085b60cb1f8SMike Christie if (val <= 0) { 2086b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2087b60cb1f8SMike Christie val); 20883abaa2bfSMike Christie return -EINVAL; 20893abaa2bfSMike Christie } 2090b60cb1f8SMike Christie *dev_attrib = val; 20913abaa2bfSMike Christie return 0; 20923abaa2bfSMike Christie } 20933abaa2bfSMike Christie 2094c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2095c97840c8SMike Christie { 2096c97840c8SMike Christie int val, ret; 2097c97840c8SMike Christie 2098c97840c8SMike Christie ret = match_int(arg, &val); 2099c97840c8SMike Christie if (ret < 0) { 2100c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2101c97840c8SMike Christie ret); 2102c97840c8SMike Christie return ret; 2103c97840c8SMike Christie } 2104c97840c8SMike Christie 2105c97840c8SMike Christie if (val <= 0) { 2106c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2107c97840c8SMike Christie return -EINVAL; 2108c97840c8SMike Christie } 2109c97840c8SMike Christie 2110c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2111c97840c8SMike Christie if (udev->data_bitmap) { 2112c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2113c97840c8SMike Christie ret = -EINVAL; 2114c97840c8SMike Christie goto unlock; 2115c97840c8SMike Christie } 2116c97840c8SMike Christie 2117c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2118c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2119c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2120c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2121c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2122c97840c8SMike Christie } 2123c97840c8SMike Christie 2124c97840c8SMike Christie unlock: 2125c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2126c97840c8SMike Christie return ret; 2127c97840c8SMike Christie } 2128c97840c8SMike Christie 21297c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 21307c9e7a6fSAndy Grover const char *page, ssize_t count) 21317c9e7a6fSAndy Grover { 21327c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 21330e0d7526SMike Christie char *orig, *ptr, *opts; 21347c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2135c97840c8SMike Christie int ret = 0, token; 21367c9e7a6fSAndy Grover 21377c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 21387c9e7a6fSAndy Grover if (!opts) 21397c9e7a6fSAndy Grover return -ENOMEM; 21407c9e7a6fSAndy Grover 21417c9e7a6fSAndy Grover orig = opts; 21427c9e7a6fSAndy Grover 21437c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 21447c9e7a6fSAndy Grover if (!*ptr) 21457c9e7a6fSAndy Grover continue; 21467c9e7a6fSAndy Grover 21477c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 21487c9e7a6fSAndy Grover switch (token) { 21497c9e7a6fSAndy Grover case Opt_dev_config: 21507c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 21517c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 21527c9e7a6fSAndy Grover ret = -EINVAL; 21537c9e7a6fSAndy Grover break; 21547c9e7a6fSAndy Grover } 21557c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 21567c9e7a6fSAndy Grover break; 21577c9e7a6fSAndy Grover case Opt_dev_size: 21580e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 21597c9e7a6fSAndy Grover if (ret < 0) 21600e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 21610e0d7526SMike Christie ret); 21627c9e7a6fSAndy Grover break; 21639c1cd1b6SAndy Grover case Opt_hw_block_size: 21643abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21653abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 21669c1cd1b6SAndy Grover break; 21673abaa2bfSMike Christie case Opt_hw_max_sectors: 21683abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21693abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 21709c1cd1b6SAndy Grover break; 2171b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2172b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2173b849b456SKenjiro Nakayama if (ret < 0) 2174b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2175b60cb1f8SMike Christie ret); 2176b849b456SKenjiro Nakayama break; 217780eb8761SMike Christie case Opt_max_data_area_mb: 2178c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 217980eb8761SMike Christie break; 21807c9e7a6fSAndy Grover default: 21817c9e7a6fSAndy Grover break; 21827c9e7a6fSAndy Grover } 21832579325cSMike Christie 21842579325cSMike Christie if (ret) 21852579325cSMike Christie break; 21867c9e7a6fSAndy Grover } 21877c9e7a6fSAndy Grover 21887c9e7a6fSAndy Grover kfree(orig); 21897c9e7a6fSAndy Grover return (!ret) ? count : ret; 21907c9e7a6fSAndy Grover } 21917c9e7a6fSAndy Grover 21927c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 21937c9e7a6fSAndy Grover { 21947c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 21957c9e7a6fSAndy Grover ssize_t bl = 0; 21967c9e7a6fSAndy Grover 21977c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 21987c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 21990e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 220080eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 220180eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 22027c9e7a6fSAndy Grover 22037c9e7a6fSAndy Grover return bl; 22047c9e7a6fSAndy Grover } 22057c9e7a6fSAndy Grover 22067c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 22077c9e7a6fSAndy Grover { 22087c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 22097c9e7a6fSAndy Grover 22107c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 22117c9e7a6fSAndy Grover dev->dev_attrib.block_size); 22127c9e7a6fSAndy Grover } 22137c9e7a6fSAndy Grover 22147c9e7a6fSAndy Grover static sense_reason_t 22157c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 22167c9e7a6fSAndy Grover { 221702eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 22189c1cd1b6SAndy Grover } 22199c1cd1b6SAndy Grover 22207d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 22217d7a7435SNicholas Bellinger { 22227d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22237d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2224b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22257d7a7435SNicholas Bellinger 22267d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 22277d7a7435SNicholas Bellinger } 22287d7a7435SNicholas Bellinger 22297d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 22307d7a7435SNicholas Bellinger size_t count) 22317d7a7435SNicholas Bellinger { 22327d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22337d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 22347d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 22357d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 22367d7a7435SNicholas Bellinger u32 val; 22377d7a7435SNicholas Bellinger int ret; 22387d7a7435SNicholas Bellinger 22397d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 22407d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 22417d7a7435SNicholas Bellinger return -EINVAL; 22427d7a7435SNicholas Bellinger } 22437d7a7435SNicholas Bellinger 22447d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 22457d7a7435SNicholas Bellinger if (ret < 0) 22467d7a7435SNicholas Bellinger return ret; 22477d7a7435SNicholas Bellinger 22487d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 22497d7a7435SNicholas Bellinger return count; 22507d7a7435SNicholas Bellinger } 22517d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 22527d7a7435SNicholas Bellinger 22539103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 22549103575aSMike Christie { 22559103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 22569103575aSMike Christie struct se_dev_attrib, da_group); 22579103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22589103575aSMike Christie 22599103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 22609103575aSMike Christie udev->qfull_time_out : 22619103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 22629103575aSMike Christie } 22639103575aSMike Christie 22649103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 22659103575aSMike Christie const char *page, size_t count) 22669103575aSMike Christie { 22679103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 22689103575aSMike Christie struct se_dev_attrib, da_group); 22699103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22709103575aSMike Christie s32 val; 22719103575aSMike Christie int ret; 22729103575aSMike Christie 22739103575aSMike Christie ret = kstrtos32(page, 0, &val); 22749103575aSMike Christie if (ret < 0) 22759103575aSMike Christie return ret; 22769103575aSMike Christie 22779103575aSMike Christie if (val >= 0) { 22789103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2279125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2280125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 22819103575aSMike Christie } else { 22829103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 22839103575aSMike Christie return -EINVAL; 22849103575aSMike Christie } 22859103575aSMike Christie return count; 22869103575aSMike Christie } 22879103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 22889103575aSMike Christie 228980eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 229080eb8761SMike Christie { 229180eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 229280eb8761SMike Christie struct se_dev_attrib, da_group); 229380eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 229480eb8761SMike Christie 229580eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 229680eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 229780eb8761SMike Christie } 229880eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 229980eb8761SMike Christie 23002d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2301ee018252SBryant G. Ly { 2302ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2303ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2304ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2305ee018252SBryant G. Ly 2306ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2307ee018252SBryant G. Ly } 2308ee018252SBryant G. Ly 230902ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 231002ccfb54SZhu Lingshan const char *reconfig_data) 231102ccfb54SZhu Lingshan { 231202ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 231302ccfb54SZhu Lingshan void *msg_header = NULL; 231402ccfb54SZhu Lingshan int ret = 0; 231502ccfb54SZhu Lingshan 231602ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 231702ccfb54SZhu Lingshan &skb, &msg_header); 231802ccfb54SZhu Lingshan if (ret < 0) 231902ccfb54SZhu Lingshan return ret; 232002ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 232102ccfb54SZhu Lingshan if (ret < 0) { 232202ccfb54SZhu Lingshan nlmsg_free(skb); 232302ccfb54SZhu Lingshan return ret; 232402ccfb54SZhu Lingshan } 232502ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 232606add777SMike Christie skb, msg_header); 232702ccfb54SZhu Lingshan } 232802ccfb54SZhu Lingshan 232902ccfb54SZhu Lingshan 23302d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2331ee018252SBryant G. Ly size_t count) 2332ee018252SBryant G. Ly { 2333ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2334ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2335ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 23362d76443eSMike Christie int ret, len; 2337ee018252SBryant G. Ly 23382d76443eSMike Christie len = strlen(page); 23392d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2340ee018252SBryant G. Ly return -EINVAL; 2341ee018252SBryant G. Ly 2342ee018252SBryant G. Ly /* Check if device has been configured before */ 234363d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 234402ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2345ee018252SBryant G. Ly if (ret) { 2346ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2347ee018252SBryant G. Ly return ret; 2348ee018252SBryant G. Ly } 2349de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2350de8c5221SBryant G. Ly 2351de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2352de8c5221SBryant G. Ly if (ret) 2353de8c5221SBryant G. Ly return ret; 2354de8c5221SBryant G. Ly return count; 2355ee018252SBryant G. Ly } 23562d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2357ee018252SBryant G. Ly 2358ee018252SBryant G. Ly return count; 2359ee018252SBryant G. Ly } 23602d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2361ee018252SBryant G. Ly 2362801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2363801fc54dSBryant G. Ly { 2364801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2365801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2366801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2367801fc54dSBryant G. Ly 23680e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2369801fc54dSBryant G. Ly } 2370801fc54dSBryant G. Ly 237184e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 237284e28506SZhu Lingshan { 237384e28506SZhu Lingshan struct sk_buff *skb = NULL; 237484e28506SZhu Lingshan void *msg_header = NULL; 237584e28506SZhu Lingshan int ret = 0; 237684e28506SZhu Lingshan 237784e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 237884e28506SZhu Lingshan &skb, &msg_header); 237984e28506SZhu Lingshan if (ret < 0) 238084e28506SZhu Lingshan return ret; 238184e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 238284e28506SZhu Lingshan size, TCMU_ATTR_PAD); 238384e28506SZhu Lingshan if (ret < 0) { 238484e28506SZhu Lingshan nlmsg_free(skb); 238584e28506SZhu Lingshan return ret; 238684e28506SZhu Lingshan } 238784e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 238806add777SMike Christie skb, msg_header); 238984e28506SZhu Lingshan } 239084e28506SZhu Lingshan 2391801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2392801fc54dSBryant G. Ly size_t count) 2393801fc54dSBryant G. Ly { 2394801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2395801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2396801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 23972d76443eSMike Christie u64 val; 2398801fc54dSBryant G. Ly int ret; 2399801fc54dSBryant G. Ly 24002d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2401801fc54dSBryant G. Ly if (ret < 0) 2402801fc54dSBryant G. Ly return ret; 2403801fc54dSBryant G. Ly 2404801fc54dSBryant G. Ly /* Check if device has been configured before */ 240563d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 240684e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2407801fc54dSBryant G. Ly if (ret) { 2408801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2409801fc54dSBryant G. Ly return ret; 2410801fc54dSBryant G. Ly } 2411801fc54dSBryant G. Ly } 24122d76443eSMike Christie udev->dev_size = val; 2413801fc54dSBryant G. Ly return count; 2414801fc54dSBryant G. Ly } 2415801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2416801fc54dSBryant G. Ly 2417b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2418b849b456SKenjiro Nakayama char *page) 2419b849b456SKenjiro Nakayama { 2420b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2421b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2422b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2423b849b456SKenjiro Nakayama 2424b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2425b849b456SKenjiro Nakayama } 2426b849b456SKenjiro Nakayama 2427b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2428b849b456SKenjiro Nakayama const char *page, size_t count) 2429b849b456SKenjiro Nakayama { 2430b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2431b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2432b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2433b849b456SKenjiro Nakayama s8 val; 2434b849b456SKenjiro Nakayama int ret; 2435b849b456SKenjiro Nakayama 2436b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2437b849b456SKenjiro Nakayama if (ret < 0) 2438b849b456SKenjiro Nakayama return ret; 2439b849b456SKenjiro Nakayama 2440b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2441b849b456SKenjiro Nakayama return count; 2442b849b456SKenjiro Nakayama } 2443b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2444b849b456SKenjiro Nakayama 24459a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 24469a8bb606SBryant G. Ly char *page) 24479a8bb606SBryant G. Ly { 24489a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24499a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24509a8bb606SBryant G. Ly 24519a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 24529a8bb606SBryant G. Ly } 24539a8bb606SBryant G. Ly 245433d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 245533d065ccSZhu Lingshan { 245633d065ccSZhu Lingshan struct sk_buff *skb = NULL; 245733d065ccSZhu Lingshan void *msg_header = NULL; 245833d065ccSZhu Lingshan int ret = 0; 245933d065ccSZhu Lingshan 246033d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 246133d065ccSZhu Lingshan &skb, &msg_header); 246233d065ccSZhu Lingshan if (ret < 0) 246333d065ccSZhu Lingshan return ret; 246433d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 246533d065ccSZhu Lingshan if (ret < 0) { 246633d065ccSZhu Lingshan nlmsg_free(skb); 246733d065ccSZhu Lingshan return ret; 246833d065ccSZhu Lingshan } 246933d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 247006add777SMike Christie skb, msg_header); 247133d065ccSZhu Lingshan } 247233d065ccSZhu Lingshan 24739a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 24749a8bb606SBryant G. Ly const char *page, size_t count) 24759a8bb606SBryant G. Ly { 24769a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24779a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24781068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24792d76443eSMike Christie u8 val; 24809a8bb606SBryant G. Ly int ret; 24819a8bb606SBryant G. Ly 24822d76443eSMike Christie ret = kstrtou8(page, 0, &val); 24839a8bb606SBryant G. Ly if (ret < 0) 24849a8bb606SBryant G. Ly return ret; 24859a8bb606SBryant G. Ly 24861068be7bSBryant G. Ly /* Check if device has been configured before */ 248763d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 248833d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 24891068be7bSBryant G. Ly if (ret) { 24901068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 24911068be7bSBryant G. Ly return ret; 24921068be7bSBryant G. Ly } 24931068be7bSBryant G. Ly } 24942d76443eSMike Christie 24952d76443eSMike Christie da->emulate_write_cache = val; 24969a8bb606SBryant G. Ly return count; 24979a8bb606SBryant G. Ly } 24989a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 24999a8bb606SBryant G. Ly 2500892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2501892782caSMike Christie { 2502892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2503892782caSMike Christie struct se_device, 2504892782caSMike Christie dev_action_group); 2505892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2506892782caSMike Christie 2507892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2508892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2509892782caSMike Christie else 2510892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2511892782caSMike Christie } 2512892782caSMike Christie 2513892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2514892782caSMike Christie size_t count) 2515892782caSMike Christie { 2516892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2517892782caSMike Christie struct se_device, 2518892782caSMike Christie dev_action_group); 2519892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2520892782caSMike Christie u8 val; 2521892782caSMike Christie int ret; 2522892782caSMike Christie 2523a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2524a30b0473SMike Christie pr_err("Device is not configured.\n"); 2525a30b0473SMike Christie return -EINVAL; 2526a30b0473SMike Christie } 2527a30b0473SMike Christie 2528892782caSMike Christie ret = kstrtou8(page, 0, &val); 2529892782caSMike Christie if (ret < 0) 2530892782caSMike Christie return ret; 2531892782caSMike Christie 2532892782caSMike Christie if (val > 1) { 2533892782caSMike Christie pr_err("Invalid block value %d\n", val); 2534892782caSMike Christie return -EINVAL; 2535892782caSMike Christie } 2536892782caSMike Christie 2537892782caSMike Christie if (!val) 2538892782caSMike Christie tcmu_unblock_dev(udev); 2539892782caSMike Christie else 2540892782caSMike Christie tcmu_block_dev(udev); 2541892782caSMike Christie return count; 2542892782caSMike Christie } 2543892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2544892782caSMike Christie 2545892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2546892782caSMike Christie size_t count) 2547892782caSMike Christie { 2548892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2549892782caSMike Christie struct se_device, 2550892782caSMike Christie dev_action_group); 2551892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2552892782caSMike Christie u8 val; 2553892782caSMike Christie int ret; 2554892782caSMike Christie 2555a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2556a30b0473SMike Christie pr_err("Device is not configured.\n"); 2557a30b0473SMike Christie return -EINVAL; 2558a30b0473SMike Christie } 2559a30b0473SMike Christie 2560892782caSMike Christie ret = kstrtou8(page, 0, &val); 2561892782caSMike Christie if (ret < 0) 2562892782caSMike Christie return ret; 2563892782caSMike Christie 2564892782caSMike Christie if (val != 1 && val != 2) { 2565892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2566892782caSMike Christie return -EINVAL; 2567892782caSMike Christie } 2568892782caSMike Christie 2569892782caSMike Christie tcmu_reset_ring(udev, val); 2570892782caSMike Christie return count; 2571892782caSMike Christie } 2572892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2573892782caSMike Christie 25745821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2575801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 25769103575aSMike Christie &tcmu_attr_qfull_time_out, 257780eb8761SMike Christie &tcmu_attr_max_data_area_mb, 25782d76443eSMike Christie &tcmu_attr_dev_config, 2579801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2580801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 2581b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2582801fc54dSBryant G. Ly NULL, 2583801fc54dSBryant G. Ly }; 2584801fc54dSBryant G. Ly 25857d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 25867d7a7435SNicholas Bellinger 2587892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2588892782caSMike Christie &tcmu_attr_block_dev, 2589892782caSMike Christie &tcmu_attr_reset_ring, 2590892782caSMike Christie NULL, 2591892782caSMike Christie }; 2592892782caSMike Christie 25937d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 25947c9e7a6fSAndy Grover .name = "user", 25957c9e7a6fSAndy Grover .owner = THIS_MODULE, 2596a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 25977c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 25987c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 25997c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 26007c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 260192634706SMike Christie .destroy_device = tcmu_destroy_device, 26027c9e7a6fSAndy Grover .free_device = tcmu_free_device, 26037c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 26047c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 26057c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 26067c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 26077c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2608892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 26097c9e7a6fSAndy Grover }; 26107c9e7a6fSAndy Grover 261189ec9cfdSMike Christie static void find_free_blocks(void) 2612b6df4b79SXiubo Li { 2613b6df4b79SXiubo Li struct tcmu_dev *udev; 2614b6df4b79SXiubo Li loff_t off; 2615af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2616af1dd7ffSMike Christie 261780eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2618af1dd7ffSMike Christie return; 2619b6df4b79SXiubo Li 2620b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2621b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2622b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2623b6df4b79SXiubo Li 2624dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2625dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2626dc335a99SMike Christie continue; 2627dc335a99SMike Christie } 2628dc335a99SMike Christie 2629b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2630b6df4b79SXiubo Li tcmu_handle_completions(udev); 2631b6df4b79SXiubo Li 2632af1dd7ffSMike Christie /* Skip the udevs in idle */ 2633af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2634b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2635b6df4b79SXiubo Li continue; 2636b6df4b79SXiubo Li } 2637b6df4b79SXiubo Li 2638b6df4b79SXiubo Li end = udev->dbi_max + 1; 2639b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2640b6df4b79SXiubo Li if (block == udev->dbi_max) { 2641b6df4b79SXiubo Li /* 2642af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2643af1dd7ffSMike Christie * reclaim any blocks. 2644b6df4b79SXiubo Li */ 2645b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2646b6df4b79SXiubo Li continue; 2647b6df4b79SXiubo Li } else if (block == end) { 2648b6df4b79SXiubo Li /* The current udev will goto idle state */ 2649b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2650b6df4b79SXiubo Li udev->dbi_max = 0; 2651b6df4b79SXiubo Li } else { 2652b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2653b6df4b79SXiubo Li udev->dbi_max = block; 2654b6df4b79SXiubo Li } 2655b6df4b79SXiubo Li 2656b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2657b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2658b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2659b6df4b79SXiubo Li 2660b6df4b79SXiubo Li /* Release the block pages */ 2661bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2662b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2663af1dd7ffSMike Christie 2664af1dd7ffSMike Christie total_freed += end - start; 2665af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2666af1dd7ffSMike Christie total_freed, udev->name); 2667b6df4b79SXiubo Li } 266889ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 266989ec9cfdSMike Christie 267080eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2671af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2672b6df4b79SXiubo Li } 2673b6df4b79SXiubo Li 2674488ebe4cSMike Christie static void check_timedout_devices(void) 2675488ebe4cSMike Christie { 2676488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 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); 2687488ebe4cSMike Christie idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 2688a94a2572SXiubo Li 2689a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 2690a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2691a94a2572SXiubo Li 26926fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2693488ebe4cSMike Christie 2694488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2695488ebe4cSMike Christie } 2696488ebe4cSMike Christie 2697488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2698488ebe4cSMike Christie } 2699488ebe4cSMike Christie 27009972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 270189ec9cfdSMike Christie { 2702488ebe4cSMike Christie check_timedout_devices(); 270389ec9cfdSMike Christie find_free_blocks(); 270489ec9cfdSMike Christie } 270589ec9cfdSMike Christie 27067c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 27077c9e7a6fSAndy Grover { 2708801fc54dSBryant G. Ly int ret, i, k, len = 0; 27097c9e7a6fSAndy Grover 27107c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 27117c9e7a6fSAndy Grover 2712af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 27139972cebbSMike Christie 27147c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 27157c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 27167c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 27177c9e7a6fSAndy Grover 0, NULL); 27187c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 27197c9e7a6fSAndy Grover return -ENOMEM; 27207c9e7a6fSAndy Grover 27217c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 27227c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 27237c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 27247c9e7a6fSAndy Grover goto out_free_cache; 27257c9e7a6fSAndy Grover } 27267c9e7a6fSAndy Grover 27277c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 27287c9e7a6fSAndy Grover if (ret < 0) { 27297c9e7a6fSAndy Grover goto out_unreg_device; 27307c9e7a6fSAndy Grover } 27317c9e7a6fSAndy Grover 27327d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 27337d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 27347d7a7435SNicholas Bellinger } 2735801fc54dSBryant G. Ly for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { 2736801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 2737801fc54dSBryant G. Ly } 2738801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 27397d7a7435SNicholas Bellinger 27407d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 27417d7a7435SNicholas Bellinger if (!tcmu_attrs) { 27427d7a7435SNicholas Bellinger ret = -ENOMEM; 27437d7a7435SNicholas Bellinger goto out_unreg_genl; 27447d7a7435SNicholas Bellinger } 27457d7a7435SNicholas Bellinger 27467d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 27477d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 27487d7a7435SNicholas Bellinger } 2749801fc54dSBryant G. Ly for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { 2750801fc54dSBryant G. Ly tcmu_attrs[i] = tcmu_attrib_attrs[k]; 27519a8bb606SBryant G. Ly i++; 2752801fc54dSBryant G. Ly } 27537d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 27547d7a7435SNicholas Bellinger 27550a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 27567c9e7a6fSAndy Grover if (ret) 27577d7a7435SNicholas Bellinger goto out_attrs; 27587c9e7a6fSAndy Grover 27597c9e7a6fSAndy Grover return 0; 27607c9e7a6fSAndy Grover 27617d7a7435SNicholas Bellinger out_attrs: 27627d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27637c9e7a6fSAndy Grover out_unreg_genl: 27647c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27657c9e7a6fSAndy Grover out_unreg_device: 27667c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27677c9e7a6fSAndy Grover out_free_cache: 27687c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27697c9e7a6fSAndy Grover 27707c9e7a6fSAndy Grover return ret; 27717c9e7a6fSAndy Grover } 27727c9e7a6fSAndy Grover 27737c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 27747c9e7a6fSAndy Grover { 2775af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 27760a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 27777d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27787c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27797c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27807c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27817c9e7a6fSAndy Grover } 27827c9e7a6fSAndy Grover 27837c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 27847c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 27857c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 27867c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 27877c9e7a6fSAndy Grover 27887c9e7a6fSAndy Grover module_init(tcmu_module_init); 27897c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 2790