17c9e7a6fSAndy Grover /* 27c9e7a6fSAndy Grover * Copyright (C) 2013 Shaohua Li <shli@kernel.org> 37c9e7a6fSAndy Grover * Copyright (C) 2014 Red Hat, Inc. 4f97ec7dbSIlias Tsitsimpis * Copyright (C) 2015 Arrikto, Inc. 5141685a3SXiubo Li * Copyright (C) 2017 Chinamobile, Inc. 67c9e7a6fSAndy Grover * 77c9e7a6fSAndy Grover * This program is free software; you can redistribute it and/or modify it 87c9e7a6fSAndy Grover * under the terms and conditions of the GNU General Public License, 97c9e7a6fSAndy Grover * version 2, as published by the Free Software Foundation. 107c9e7a6fSAndy Grover * 117c9e7a6fSAndy Grover * This program is distributed in the hope it will be useful, but WITHOUT 127c9e7a6fSAndy Grover * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 137c9e7a6fSAndy Grover * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 147c9e7a6fSAndy Grover * more details. 157c9e7a6fSAndy Grover * 167c9e7a6fSAndy Grover * You should have received a copy of the GNU General Public License along with 177c9e7a6fSAndy Grover * this program; if not, write to the Free Software Foundation, Inc., 187c9e7a6fSAndy Grover * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 197c9e7a6fSAndy Grover */ 207c9e7a6fSAndy Grover 217c9e7a6fSAndy Grover #include <linux/spinlock.h> 227c9e7a6fSAndy Grover #include <linux/module.h> 237c9e7a6fSAndy Grover #include <linux/idr.h> 24ba929992SBart Van Assche #include <linux/kernel.h> 257c9e7a6fSAndy Grover #include <linux/timer.h> 267c9e7a6fSAndy Grover #include <linux/parser.h> 275538d294SDavid S. Miller #include <linux/vmalloc.h> 287c9e7a6fSAndy Grover #include <linux/uio_driver.h> 29141685a3SXiubo Li #include <linux/radix-tree.h> 30ac64a2ceSDavid Disseldorp #include <linux/stringify.h> 3126418649SSheng Yang #include <linux/bitops.h> 32f5045724SBart Van Assche #include <linux/highmem.h> 337d7a7435SNicholas Bellinger #include <linux/configfs.h> 34b6df4b79SXiubo Li #include <linux/mutex.h> 359972cebbSMike Christie #include <linux/workqueue.h> 367c9e7a6fSAndy Grover #include <net/genetlink.h> 37ba929992SBart Van Assche #include <scsi/scsi_common.h> 38ba929992SBart Van Assche #include <scsi/scsi_proto.h> 397c9e7a6fSAndy Grover #include <target/target_core_base.h> 407c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 417c9e7a6fSAndy Grover #include <target/target_core_backend.h> 42e9f720d6SNicholas Bellinger 437c9e7a6fSAndy Grover #include <linux/target_core_user.h> 447c9e7a6fSAndy Grover 45572ccdabSRandy Dunlap /** 46572ccdabSRandy Dunlap * DOC: Userspace I/O 47572ccdabSRandy Dunlap * Userspace I/O 48572ccdabSRandy Dunlap * ------------- 49572ccdabSRandy Dunlap * 507c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 517c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 527c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 537c9e7a6fSAndy Grover * 547c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 557c9e7a6fSAndy Grover * introspection work for us. 567c9e7a6fSAndy Grover * 577c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 587c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 597c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 60572ccdabSRandy Dunlap * internal to the mmap-ed area. There is separate space outside the 617c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 627c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 637c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 647c9e7a6fSAndy Grover * 657c9e7a6fSAndy Grover * SECURITY: 667c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 677c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 687c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 697c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 707c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 717c9e7a6fSAndy Grover * this may have a 'UAM' comment. 727c9e7a6fSAndy Grover */ 737c9e7a6fSAndy Grover 747c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 757c9e7a6fSAndy Grover 76b6df4b79SXiubo Li /* For cmd area, the size is fixed 8MB */ 77b6df4b79SXiubo Li #define CMDR_SIZE (8 * 1024 * 1024) 7826418649SSheng Yang 79b6df4b79SXiubo Li /* 80b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 81b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 82b6df4b79SXiubo Li */ 83b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 8480eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 8580eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 867c9e7a6fSAndy Grover 8780eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 8880eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 8980eb8761SMike Christie 90af1dd7ffSMike Christie /* 91af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 92af1dd7ffSMike Christie * when the unmap thread will be started. 93af1dd7ffSMike Christie */ 9480eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 95b6df4b79SXiubo Li 96b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 97bdaeedc1SMike Christie static u8 tcmu_netlink_blocked; 98b3af66e2SMike Christie 997c9e7a6fSAndy Grover static struct device *tcmu_root_device; 1007c9e7a6fSAndy Grover 1017c9e7a6fSAndy Grover struct tcmu_hba { 1027c9e7a6fSAndy Grover u32 host_id; 1037c9e7a6fSAndy Grover }; 1047c9e7a6fSAndy Grover 1057c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 1067c9e7a6fSAndy Grover 1073228691fSMike Christie static DEFINE_MUTEX(tcmu_nl_cmd_mutex); 1083228691fSMike Christie static LIST_HEAD(tcmu_nl_cmd_list); 1093228691fSMike Christie 1103228691fSMike Christie struct tcmu_dev; 1113228691fSMike Christie 112b3af66e2SMike Christie struct tcmu_nl_cmd { 113b3af66e2SMike Christie /* wake up thread waiting for reply */ 114b3af66e2SMike Christie struct completion complete; 1153228691fSMike Christie struct list_head nl_list; 1163228691fSMike Christie struct tcmu_dev *udev; 117b3af66e2SMike Christie int cmd; 118b3af66e2SMike Christie int status; 119b3af66e2SMike Christie }; 120b3af66e2SMike Christie 1217c9e7a6fSAndy Grover struct tcmu_dev { 122b6df4b79SXiubo Li struct list_head node; 123f3cdbe39SMike Christie struct kref kref; 124af1dd7ffSMike Christie 1257c9e7a6fSAndy Grover struct se_device se_dev; 1267c9e7a6fSAndy Grover 1277c9e7a6fSAndy Grover char *name; 1287c9e7a6fSAndy Grover struct se_hba *hba; 1297c9e7a6fSAndy Grover 1307c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1317c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 132892782caSMike Christie #define TCMU_DEV_BIT_BLOCKED 2 1337c9e7a6fSAndy Grover unsigned long flags; 1347c9e7a6fSAndy Grover 1357c9e7a6fSAndy Grover struct uio_info uio_info; 1367c9e7a6fSAndy Grover 137b6df4b79SXiubo Li struct inode *inode; 138b6df4b79SXiubo Li 1397c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1400e0d7526SMike Christie uint64_t dev_size; 1417c9e7a6fSAndy Grover u32 cmdr_size; 1427c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1433d9b9555SAndy Grover /* Offset of data area from start of mb */ 14426418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1457c9e7a6fSAndy Grover size_t data_off; 1467c9e7a6fSAndy Grover size_t data_size; 14780eb8761SMike Christie uint32_t max_blocks; 14880eb8761SMike Christie size_t ring_size; 14926418649SSheng Yang 150b6df4b79SXiubo Li struct mutex cmdr_lock; 151a94a2572SXiubo Li struct list_head qfull_queue; 1527c9e7a6fSAndy Grover 153141685a3SXiubo Li uint32_t dbi_max; 154b6df4b79SXiubo Li uint32_t dbi_thresh; 15580eb8761SMike Christie unsigned long *data_bitmap; 156141685a3SXiubo Li struct radix_tree_root data_blocks; 157141685a3SXiubo Li 1587c9e7a6fSAndy Grover struct idr commands; 1597c9e7a6fSAndy Grover 1609103575aSMike Christie struct timer_list cmd_timer; 161af980e46SMike Christie unsigned int cmd_time_out; 162a94a2572SXiubo Li struct list_head inflight_queue; 1639103575aSMike Christie 1649103575aSMike Christie struct timer_list qfull_timer; 1659103575aSMike Christie int qfull_time_out; 1669103575aSMike Christie 167488ebe4cSMike Christie struct list_head timedout_entry; 1687c9e7a6fSAndy Grover 169b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 170b3af66e2SMike Christie 1717c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 172b849b456SKenjiro Nakayama 173b849b456SKenjiro Nakayama int nl_reply_supported; 1747c9e7a6fSAndy Grover }; 1757c9e7a6fSAndy Grover 1767c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1777c9e7a6fSAndy Grover 1787c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1797c9e7a6fSAndy Grover 1807c9e7a6fSAndy Grover struct tcmu_cmd { 1817c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1827c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 183a94a2572SXiubo Li struct list_head queue_entry; 1847c9e7a6fSAndy Grover 1857c9e7a6fSAndy Grover uint16_t cmd_id; 1867c9e7a6fSAndy Grover 18726418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1887c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 189141685a3SXiubo Li uint32_t dbi_cnt; 190141685a3SXiubo Li uint32_t dbi_cur; 191141685a3SXiubo Li uint32_t *dbi; 1927c9e7a6fSAndy Grover 1937c9e7a6fSAndy Grover unsigned long deadline; 1947c9e7a6fSAndy Grover 1957c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 196a94a2572SXiubo Li #define TCMU_CMD_BIT_INFLIGHT 1 1977c9e7a6fSAndy Grover unsigned long flags; 1987c9e7a6fSAndy Grover }; 199af1dd7ffSMike Christie /* 200af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 201af1dd7ffSMike Christie * 202af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 203af1dd7ffSMike Christie * ... 204af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 205af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 206af1dd7ffSMike Christie * ... 207af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 208af1dd7ffSMike Christie */ 209b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 210b6df4b79SXiubo Li static LIST_HEAD(root_udev); 211b6df4b79SXiubo Li 212488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 213488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 214488ebe4cSMike Christie 21580eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 21680eb8761SMike Christie 217b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 218af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 21980eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 220b6df4b79SXiubo Li 22180eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 22280eb8761SMike Christie const struct kernel_param *kp) 22380eb8761SMike Christie { 22480eb8761SMike Christie int ret, max_area_mb; 22580eb8761SMike Christie 22680eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 22780eb8761SMike Christie if (ret) 22880eb8761SMike Christie return -EINVAL; 22980eb8761SMike Christie 23080eb8761SMike Christie if (max_area_mb <= 0) { 23180eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 23280eb8761SMike Christie return -EINVAL; 23380eb8761SMike Christie } 23480eb8761SMike Christie 23580eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 23680eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 23780eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 23880eb8761SMike Christie else 23980eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 24080eb8761SMike Christie 24180eb8761SMike Christie return 0; 24280eb8761SMike Christie } 24380eb8761SMike Christie 24480eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 24580eb8761SMike Christie const struct kernel_param *kp) 24680eb8761SMike Christie { 24780eb8761SMike Christie return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 24880eb8761SMike Christie } 24980eb8761SMike Christie 25080eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 25180eb8761SMike Christie .set = tcmu_set_global_max_data_area, 25280eb8761SMike Christie .get = tcmu_get_global_max_data_area, 25380eb8761SMike Christie }; 25480eb8761SMike Christie 25580eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 25680eb8761SMike Christie S_IWUSR | S_IRUGO); 25780eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 25880eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 25980eb8761SMike Christie "data areas."); 2607c9e7a6fSAndy Grover 261bdaeedc1SMike Christie static int tcmu_get_block_netlink(char *buffer, 262bdaeedc1SMike Christie const struct kernel_param *kp) 263bdaeedc1SMike Christie { 264bdaeedc1SMike Christie return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? 265bdaeedc1SMike Christie "blocked" : "unblocked"); 266bdaeedc1SMike Christie } 267bdaeedc1SMike Christie 268bdaeedc1SMike Christie static int tcmu_set_block_netlink(const char *str, 269bdaeedc1SMike Christie const struct kernel_param *kp) 270bdaeedc1SMike Christie { 271bdaeedc1SMike Christie int ret; 272bdaeedc1SMike Christie u8 val; 273bdaeedc1SMike Christie 274bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 275bdaeedc1SMike Christie if (ret < 0) 276bdaeedc1SMike Christie return ret; 277bdaeedc1SMike Christie 278bdaeedc1SMike Christie if (val > 1) { 279bdaeedc1SMike Christie pr_err("Invalid block netlink value %u\n", val); 280bdaeedc1SMike Christie return -EINVAL; 281bdaeedc1SMike Christie } 282bdaeedc1SMike Christie 283bdaeedc1SMike Christie tcmu_netlink_blocked = val; 284bdaeedc1SMike Christie return 0; 285bdaeedc1SMike Christie } 286bdaeedc1SMike Christie 287bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_block_netlink_op = { 288bdaeedc1SMike Christie .set = tcmu_set_block_netlink, 289bdaeedc1SMike Christie .get = tcmu_get_block_netlink, 290bdaeedc1SMike Christie }; 291bdaeedc1SMike Christie 292bdaeedc1SMike Christie module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); 293bdaeedc1SMike Christie MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); 294bdaeedc1SMike Christie 295bdaeedc1SMike Christie static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) 296bdaeedc1SMike Christie { 297bdaeedc1SMike Christie struct tcmu_dev *udev = nl_cmd->udev; 298bdaeedc1SMike Christie 299bdaeedc1SMike Christie if (!tcmu_netlink_blocked) { 300bdaeedc1SMike Christie pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); 301bdaeedc1SMike Christie return -EBUSY; 302bdaeedc1SMike Christie } 303bdaeedc1SMike Christie 304bdaeedc1SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 305bdaeedc1SMike Christie pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); 306bdaeedc1SMike Christie nl_cmd->status = -EINTR; 307bdaeedc1SMike Christie list_del(&nl_cmd->nl_list); 308bdaeedc1SMike Christie complete(&nl_cmd->complete); 309bdaeedc1SMike Christie } 310bdaeedc1SMike Christie return 0; 311bdaeedc1SMike Christie } 312bdaeedc1SMike Christie 313bdaeedc1SMike Christie static int tcmu_set_reset_netlink(const char *str, 314bdaeedc1SMike Christie const struct kernel_param *kp) 315bdaeedc1SMike Christie { 316bdaeedc1SMike Christie struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; 317bdaeedc1SMike Christie int ret; 318bdaeedc1SMike Christie u8 val; 319bdaeedc1SMike Christie 320bdaeedc1SMike Christie ret = kstrtou8(str, 0, &val); 321bdaeedc1SMike Christie if (ret < 0) 322bdaeedc1SMike Christie return ret; 323bdaeedc1SMike Christie 324bdaeedc1SMike Christie if (val != 1) { 325bdaeedc1SMike Christie pr_err("Invalid reset netlink value %u\n", val); 326bdaeedc1SMike Christie return -EINVAL; 327bdaeedc1SMike Christie } 328bdaeedc1SMike Christie 329bdaeedc1SMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 330bdaeedc1SMike Christie list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { 331bdaeedc1SMike Christie ret = tcmu_fail_netlink_cmd(nl_cmd); 332bdaeedc1SMike Christie if (ret) 333bdaeedc1SMike Christie break; 334bdaeedc1SMike Christie } 335bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 336bdaeedc1SMike Christie 337bdaeedc1SMike Christie return ret; 338bdaeedc1SMike Christie } 339bdaeedc1SMike Christie 340bdaeedc1SMike Christie static const struct kernel_param_ops tcmu_reset_netlink_op = { 341bdaeedc1SMike Christie .set = tcmu_set_reset_netlink, 342bdaeedc1SMike Christie }; 343bdaeedc1SMike Christie 344bdaeedc1SMike Christie module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); 345bdaeedc1SMike Christie MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); 346bdaeedc1SMike Christie 3477c9e7a6fSAndy Grover /* multicast group */ 3487c9e7a6fSAndy Grover enum tcmu_multicast_groups { 3497c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 3507c9e7a6fSAndy Grover }; 3517c9e7a6fSAndy Grover 3527c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 3537c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 3547c9e7a6fSAndy Grover }; 3557c9e7a6fSAndy Grover 356b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 357b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 358b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 359b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 360b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 361b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 362b3af66e2SMike Christie }; 363b3af66e2SMike Christie 364b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 365b3af66e2SMike Christie { 3663228691fSMike Christie struct tcmu_dev *udev = NULL; 367b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 368b3af66e2SMike Christie int dev_id, rc, ret = 0; 369b3af66e2SMike Christie 370b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 371b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 372b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 373b3af66e2SMike Christie return -EINVAL; 374b3af66e2SMike Christie } 375b3af66e2SMike Christie 376b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 377b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 378b3af66e2SMike Christie 3793228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 3803228691fSMike Christie list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { 3813228691fSMike Christie if (nl_cmd->udev->se_dev.dev_index == dev_id) { 3823228691fSMike Christie udev = nl_cmd->udev; 3833228691fSMike Christie break; 384b3af66e2SMike Christie } 3853228691fSMike Christie } 386b3af66e2SMike Christie 3873228691fSMike Christie if (!udev) { 3880c218e16SMike Christie pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", 3893228691fSMike Christie completed_cmd, rc, dev_id); 3903228691fSMike Christie ret = -ENODEV; 3913228691fSMike Christie goto unlock; 3923228691fSMike Christie } 3933228691fSMike Christie list_del(&nl_cmd->nl_list); 394b3af66e2SMike Christie 395bdaeedc1SMike Christie pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", 396bdaeedc1SMike Christie udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, 397bdaeedc1SMike Christie nl_cmd->status); 398b3af66e2SMike Christie 399b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 4003228691fSMike Christie pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", 4013228691fSMike Christie udev->name, completed_cmd, nl_cmd->cmd); 402b3af66e2SMike Christie ret = -EINVAL; 4033228691fSMike Christie goto unlock; 404b3af66e2SMike Christie } 405b3af66e2SMike Christie 4063228691fSMike Christie nl_cmd->status = rc; 407b3af66e2SMike Christie complete(&nl_cmd->complete); 4083228691fSMike Christie unlock: 4093228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 410b3af66e2SMike Christie return ret; 411b3af66e2SMike Christie } 412b3af66e2SMike Christie 413b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 414b3af66e2SMike Christie { 415b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 416b3af66e2SMike Christie } 417b3af66e2SMike Christie 418b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 419b3af66e2SMike Christie { 420b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 421b3af66e2SMike Christie } 422b3af66e2SMike Christie 423b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 424b3af66e2SMike Christie struct genl_info *info) 425b3af66e2SMike Christie { 426b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 427b3af66e2SMike Christie } 428b3af66e2SMike Christie 429b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 430b3af66e2SMike Christie { 431b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 432b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 433b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 434b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 435b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 436b3af66e2SMike Christie } 437b3af66e2SMike Christie 438b3af66e2SMike Christie return 0; 439b3af66e2SMike Christie } 440b3af66e2SMike Christie 441b3af66e2SMike Christie static const struct genl_ops tcmu_genl_ops[] = { 442b3af66e2SMike Christie { 443b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 444ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 445b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 446b3af66e2SMike Christie .doit = tcmu_genl_set_features, 447b3af66e2SMike Christie }, 448b3af66e2SMike Christie { 449b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 450ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 451b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 452b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 453b3af66e2SMike Christie }, 454b3af66e2SMike Christie { 455b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 456ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 457b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 458b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 459b3af66e2SMike Christie }, 460b3af66e2SMike Christie { 461b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 462ef6243acSJohannes Berg .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 463b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 464b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 465b3af66e2SMike Christie }, 466b3af66e2SMike Christie }; 467b3af66e2SMike Christie 4687c9e7a6fSAndy Grover /* Our generic netlink family */ 46956989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 470489111e5SJohannes Berg .module = THIS_MODULE, 4717c9e7a6fSAndy Grover .hdrsize = 0, 4727c9e7a6fSAndy Grover .name = "TCM-USER", 473b3af66e2SMike Christie .version = 2, 4747c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 4753b0f31f2SJohannes Berg .policy = tcmu_attr_policy, 4767c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 4777c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 47820c08b36SSheng Yang .netnsok = true, 479b3af66e2SMike Christie .ops = tcmu_genl_ops, 480b3af66e2SMike Christie .n_ops = ARRAY_SIZE(tcmu_genl_ops), 4817c9e7a6fSAndy Grover }; 4827c9e7a6fSAndy Grover 483141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 484141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 485141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 486141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 487141685a3SXiubo Li 488b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 489141685a3SXiubo Li { 490141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 491141685a3SXiubo Li uint32_t i; 492141685a3SXiubo Li 493b6df4b79SXiubo Li for (i = 0; i < len; i++) 494141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 495141685a3SXiubo Li } 496141685a3SXiubo Li 497b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 498b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 499141685a3SXiubo Li { 500b6df4b79SXiubo Li struct page *page; 501b6df4b79SXiubo Li int ret, dbi; 502141685a3SXiubo Li 503b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 504b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 505b6df4b79SXiubo Li return false; 506b6df4b79SXiubo Li 507b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 508b6df4b79SXiubo Li if (!page) { 509b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 51080eb8761SMike Christie tcmu_global_max_blocks) 511af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 512b6df4b79SXiubo Li 513b6df4b79SXiubo Li /* try to get new page from the mm */ 514b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL); 515b6df4b79SXiubo Li if (!page) 516daf78c30SXiubo Li goto err_alloc; 517b6df4b79SXiubo Li 518b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 519daf78c30SXiubo Li if (ret) 520daf78c30SXiubo Li goto err_insert; 521b6df4b79SXiubo Li } 522b6df4b79SXiubo Li 523141685a3SXiubo Li if (dbi > udev->dbi_max) 524141685a3SXiubo Li udev->dbi_max = dbi; 525141685a3SXiubo Li 526141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 527b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 528141685a3SXiubo Li 529b6df4b79SXiubo Li return true; 530daf78c30SXiubo Li err_insert: 531daf78c30SXiubo Li __free_page(page); 532daf78c30SXiubo Li err_alloc: 533daf78c30SXiubo Li atomic_dec(&global_db_count); 534daf78c30SXiubo Li return false; 535141685a3SXiubo Li } 536141685a3SXiubo Li 537b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 538b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 539b6df4b79SXiubo Li { 540b6df4b79SXiubo Li int i; 541b6df4b79SXiubo Li 542b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 543b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 544af1dd7ffSMike Christie return false; 545141685a3SXiubo Li } 546b6df4b79SXiubo Li return true; 547141685a3SXiubo Li } 548141685a3SXiubo Li 549b6df4b79SXiubo Li static inline struct page * 550b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 551141685a3SXiubo Li { 552141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 553141685a3SXiubo Li } 554141685a3SXiubo Li 555141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 556141685a3SXiubo Li { 557141685a3SXiubo Li kfree(tcmu_cmd->dbi); 558141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 559141685a3SXiubo Li } 560141685a3SXiubo Li 561141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 562141685a3SXiubo Li { 563141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 564141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 565141685a3SXiubo Li 566141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 567141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 568141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 569141685a3SXiubo Li DATA_BLOCK_SIZE); 570141685a3SXiubo Li } 571141685a3SXiubo Li 572141685a3SXiubo Li return data_length; 573141685a3SXiubo Li } 574141685a3SXiubo Li 575141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 576141685a3SXiubo Li { 577141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 578141685a3SXiubo Li 579141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 580141685a3SXiubo Li } 581141685a3SXiubo Li 5827c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 5837c9e7a6fSAndy Grover { 5847c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5857c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5867c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5877c9e7a6fSAndy Grover 5887c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 5897c9e7a6fSAndy Grover if (!tcmu_cmd) 5907c9e7a6fSAndy Grover return NULL; 5917c9e7a6fSAndy Grover 592a94a2572SXiubo Li INIT_LIST_HEAD(&tcmu_cmd->queue_entry); 5937c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 5947c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 5957c9e7a6fSAndy Grover 596141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 597141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 598141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 599141685a3SXiubo Li GFP_KERNEL); 600141685a3SXiubo Li if (!tcmu_cmd->dbi) { 601141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 602141685a3SXiubo Li return NULL; 603141685a3SXiubo Li } 604141685a3SXiubo Li 6057c9e7a6fSAndy Grover return tcmu_cmd; 6067c9e7a6fSAndy Grover } 6077c9e7a6fSAndy Grover 6087c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 6097c9e7a6fSAndy Grover { 610b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 61126d2b310Stangwenji void *start = vaddr - offset; 6127c9e7a6fSAndy Grover 6137c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 6147c9e7a6fSAndy Grover 6157c9e7a6fSAndy Grover while (size) { 61626d2b310Stangwenji flush_dcache_page(virt_to_page(start)); 61726d2b310Stangwenji start += PAGE_SIZE; 6187c9e7a6fSAndy Grover size -= PAGE_SIZE; 6197c9e7a6fSAndy Grover } 6207c9e7a6fSAndy Grover } 6217c9e7a6fSAndy Grover 6227c9e7a6fSAndy Grover /* 6237c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 6247c9e7a6fSAndy Grover * we can't use circ_buf.h. 6257c9e7a6fSAndy Grover */ 6267c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 6277c9e7a6fSAndy Grover { 6287c9e7a6fSAndy Grover int diff = head - tail; 6297c9e7a6fSAndy Grover 6307c9e7a6fSAndy Grover if (diff >= 0) 6317c9e7a6fSAndy Grover return diff; 6327c9e7a6fSAndy Grover else 6337c9e7a6fSAndy Grover return size + diff; 6347c9e7a6fSAndy Grover } 6357c9e7a6fSAndy Grover 6367c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 6377c9e7a6fSAndy Grover { 6387c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 6397c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 6407c9e7a6fSAndy Grover } 6417c9e7a6fSAndy Grover 6427c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 6437c9e7a6fSAndy Grover { 6447c9e7a6fSAndy Grover return size - head; 6457c9e7a6fSAndy Grover } 6467c9e7a6fSAndy Grover 6473e609135SXiubo Li static inline void new_iov(struct iovec **iov, int *iov_cnt) 648f1dbd087SSheng Yang { 649f1dbd087SSheng Yang struct iovec *iovec; 650f1dbd087SSheng Yang 651f1dbd087SSheng Yang if (*iov_cnt != 0) 652f1dbd087SSheng Yang (*iov)++; 653f1dbd087SSheng Yang (*iov_cnt)++; 654f1dbd087SSheng Yang 655f1dbd087SSheng Yang iovec = *iov; 656f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 657f1dbd087SSheng Yang } 658f1dbd087SSheng Yang 6597c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 6607c9e7a6fSAndy Grover 66126418649SSheng Yang /* offset is relative to mb_addr */ 662141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 663141685a3SXiubo Li int dbi, int remaining) 66426418649SSheng Yang { 665141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 66626418649SSheng Yang DATA_BLOCK_SIZE - remaining; 66726418649SSheng Yang } 66826418649SSheng Yang 669daf78c30SXiubo Li static inline size_t iov_tail(struct iovec *iov) 67026418649SSheng Yang { 67126418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 67226418649SSheng Yang } 67326418649SSheng Yang 6741a1fc0b8SMike Christie static void scatter_data_area(struct tcmu_dev *udev, 675141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 676141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 677141685a3SXiubo Li int *iov_cnt, bool copy_data) 678f97ec7dbSIlias Tsitsimpis { 679141685a3SXiubo Li int i, dbi; 68026418649SSheng Yang int block_remaining = 0; 681141685a3SXiubo Li void *from, *to = NULL; 682141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 683f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 684b6df4b79SXiubo Li struct page *page; 685f97ec7dbSIlias Tsitsimpis 686f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 68726418649SSheng Yang int sg_remaining = sg->length; 688f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 68926418649SSheng Yang while (sg_remaining > 0) { 69026418649SSheng Yang if (block_remaining == 0) { 691b6df4b79SXiubo Li if (to) 692b6df4b79SXiubo Li kunmap_atomic(to); 693b6df4b79SXiubo Li 69426418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 695b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 696b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 697b6df4b79SXiubo Li to = kmap_atomic(page); 698141685a3SXiubo Li } 699141685a3SXiubo Li 7003e609135SXiubo Li /* 7013e609135SXiubo Li * Covert to virtual offset of the ring data area. 7023e609135SXiubo Li */ 703141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 70426418649SSheng Yang block_remaining); 705141685a3SXiubo Li 7063e609135SXiubo Li /* 7073e609135SXiubo Li * The following code will gather and map the blocks 7083e609135SXiubo Li * to the same iovec when the blocks are all next to 7093e609135SXiubo Li * each other. 7103e609135SXiubo Li */ 7113e609135SXiubo Li copy_bytes = min_t(size_t, sg_remaining, 7123e609135SXiubo Li block_remaining); 71326418649SSheng Yang if (*iov_cnt != 0 && 714daf78c30SXiubo Li to_offset == iov_tail(*iov)) { 7153e609135SXiubo Li /* 7163e609135SXiubo Li * Will append to the current iovec, because 7173e609135SXiubo Li * the current block page is next to the 7183e609135SXiubo Li * previous one. 7193e609135SXiubo Li */ 720f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 72126418649SSheng Yang } else { 7223e609135SXiubo Li /* 7233e609135SXiubo Li * Will allocate a new iovec because we are 7243e609135SXiubo Li * first time here or the current block page 7253e609135SXiubo Li * is not next to the previous one. 7263e609135SXiubo Li */ 7273e609135SXiubo Li new_iov(iov, iov_cnt); 72826418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 729f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 73026418649SSheng Yang } 7313e609135SXiubo Li 732f97ec7dbSIlias Tsitsimpis if (copy_data) { 733c542942cSXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 734c542942cSXiubo Li memcpy(to + offset, 735c542942cSXiubo Li from + sg->length - sg_remaining, 73626418649SSheng Yang copy_bytes); 737f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 738f97ec7dbSIlias Tsitsimpis } 7393e609135SXiubo Li 74026418649SSheng Yang sg_remaining -= copy_bytes; 74126418649SSheng Yang block_remaining -= copy_bytes; 742f97ec7dbSIlias Tsitsimpis } 743e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 744f97ec7dbSIlias Tsitsimpis } 7453e609135SXiubo Li 746b6df4b79SXiubo Li if (to) 747b6df4b79SXiubo Li kunmap_atomic(to); 7480c28481fSSheng Yang } 7490c28481fSSheng Yang 750a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 7516c3796d1Sbstroesser@ts.fujitsu.com bool bidi, uint32_t read_len) 752f97ec7dbSIlias Tsitsimpis { 753a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 754141685a3SXiubo Li int i, dbi; 75526418649SSheng Yang int block_remaining = 0; 756b6df4b79SXiubo Li void *from = NULL, *to; 757141685a3SXiubo Li size_t copy_bytes, offset; 758a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 759b6df4b79SXiubo Li struct page *page; 760a5d68ba8SXiubo Li unsigned int data_nents; 761141685a3SXiubo Li uint32_t count = 0; 762a5d68ba8SXiubo Li 763a5d68ba8SXiubo Li if (!bidi) { 764a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 765a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 766a5d68ba8SXiubo Li } else { 767a5d68ba8SXiubo Li 768a5d68ba8SXiubo Li /* 769a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 770a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 771a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 772a5d68ba8SXiubo Li */ 773a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 774a5d68ba8SXiubo Li 775a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 776a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 777a5d68ba8SXiubo Li } 778f97ec7dbSIlias Tsitsimpis 779141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 780141685a3SXiubo Li 781f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 78226418649SSheng Yang int sg_remaining = sg->length; 783f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 7846c3796d1Sbstroesser@ts.fujitsu.com while (sg_remaining > 0 && read_len > 0) { 78526418649SSheng Yang if (block_remaining == 0) { 786b6df4b79SXiubo Li if (from) 787b6df4b79SXiubo Li kunmap_atomic(from); 788b6df4b79SXiubo Li 78926418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 790141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 791b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 792b6df4b79SXiubo Li from = kmap_atomic(page); 79326418649SSheng Yang } 79426418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 79526418649SSheng Yang block_remaining); 7966c3796d1Sbstroesser@ts.fujitsu.com if (read_len < copy_bytes) 7976c3796d1Sbstroesser@ts.fujitsu.com copy_bytes = read_len; 798141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 799f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 800c542942cSXiubo Li memcpy(to + sg->length - sg_remaining, from + offset, 80126418649SSheng Yang copy_bytes); 802f97ec7dbSIlias Tsitsimpis 80326418649SSheng Yang sg_remaining -= copy_bytes; 80426418649SSheng Yang block_remaining -= copy_bytes; 8056c3796d1Sbstroesser@ts.fujitsu.com read_len -= copy_bytes; 806f97ec7dbSIlias Tsitsimpis } 807e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 8086c3796d1Sbstroesser@ts.fujitsu.com if (read_len == 0) 8096c3796d1Sbstroesser@ts.fujitsu.com break; 810f97ec7dbSIlias Tsitsimpis } 811b6df4b79SXiubo Li if (from) 812b6df4b79SXiubo Li kunmap_atomic(from); 813f97ec7dbSIlias Tsitsimpis } 814f97ec7dbSIlias Tsitsimpis 815b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 81626418649SSheng Yang { 8173c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 81826418649SSheng Yang } 81926418649SSheng Yang 8207c9e7a6fSAndy Grover /* 821f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 8223d9b9555SAndy Grover * space available on the data area. 8237c9e7a6fSAndy Grover * 8247c9e7a6fSAndy Grover * Called with ring lock held. 8257c9e7a6fSAndy Grover */ 826b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 827b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 8287c9e7a6fSAndy Grover { 8297c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 830b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 831b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 8320241fd39SNicholas Bellinger size_t space, cmd_needed; 8337c9e7a6fSAndy Grover u32 cmd_head; 8347c9e7a6fSAndy Grover 8357c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8367c9e7a6fSAndy Grover 8377c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8387c9e7a6fSAndy Grover 839f56574a2SAndy Grover /* 840f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 841f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 842f56574a2SAndy Grover */ 843f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 844f56574a2SAndy Grover cmd_needed = cmd_size; 845f56574a2SAndy Grover else 846f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 847f56574a2SAndy Grover 8487c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 8497c9e7a6fSAndy Grover if (space < cmd_needed) { 8507c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 8517c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 8527c9e7a6fSAndy Grover return false; 8537c9e7a6fSAndy Grover } 8547c9e7a6fSAndy Grover 855b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 856b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 8573c0f26ffSMike Christie if ((space * DATA_BLOCK_SIZE) < data_needed) { 85880eb8761SMike Christie unsigned long blocks_left = 85980eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 860b6df4b79SXiubo Li 861b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 862b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 863b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 864b6df4b79SXiubo Li data_needed); 8657c9e7a6fSAndy Grover return false; 8667c9e7a6fSAndy Grover } 8677c9e7a6fSAndy Grover 868f890f579SMike Christie udev->dbi_thresh += blocks_needed; 86980eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 87080eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 871b6df4b79SXiubo Li } 872b6df4b79SXiubo Li 873daf78c30SXiubo Li return tcmu_get_empty_blocks(udev, cmd); 8747c9e7a6fSAndy Grover } 8757c9e7a6fSAndy Grover 876fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 877fe25cc34SXiubo Li { 878fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 879fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 880fe25cc34SXiubo Li } 881fe25cc34SXiubo Li 882fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 883fe25cc34SXiubo Li size_t base_command_size) 884fe25cc34SXiubo Li { 885fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 886fe25cc34SXiubo Li size_t command_size; 887fe25cc34SXiubo Li 888fe25cc34SXiubo Li command_size = base_command_size + 889fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 890fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 891fe25cc34SXiubo Li 892fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 893fe25cc34SXiubo Li 894fe25cc34SXiubo Li return command_size; 895fe25cc34SXiubo Li } 896fe25cc34SXiubo Li 8979103575aSMike Christie static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 8989103575aSMike Christie struct timer_list *timer) 8990d44374cSMike Christie { 9000d44374cSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9010d44374cSMike Christie int cmd_id; 9020d44374cSMike Christie 9030d44374cSMike Christie if (tcmu_cmd->cmd_id) 9049103575aSMike Christie goto setup_timer; 9050d44374cSMike Christie 9060d44374cSMike Christie cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 9070d44374cSMike Christie if (cmd_id < 0) { 9080d44374cSMike Christie pr_err("tcmu: Could not allocate cmd id.\n"); 9090d44374cSMike Christie return cmd_id; 9100d44374cSMike Christie } 9110d44374cSMike Christie tcmu_cmd->cmd_id = cmd_id; 9120d44374cSMike Christie 913af1dd7ffSMike Christie pr_debug("allocated cmd %u for dev %s tmo %lu\n", tcmu_cmd->cmd_id, 914af1dd7ffSMike Christie udev->name, tmo / MSEC_PER_SEC); 9150d44374cSMike Christie 9169103575aSMike Christie setup_timer: 9179103575aSMike Christie if (!tmo) 9189103575aSMike Christie return 0; 9199103575aSMike Christie 9200d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 921a94a2572SXiubo Li if (!timer_pending(timer)) 9229103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 923a94a2572SXiubo Li 9240d44374cSMike Christie return 0; 9250d44374cSMike Christie } 9260d44374cSMike Christie 927a94a2572SXiubo Li static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) 928af1dd7ffSMike Christie { 929af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9309103575aSMike Christie unsigned int tmo; 931af1dd7ffSMike Christie int ret; 932af1dd7ffSMike Christie 9339103575aSMike Christie /* 9349103575aSMike Christie * For backwards compat if qfull_time_out is not set use 9359103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 9369103575aSMike Christie */ 9379103575aSMike Christie if (!udev->qfull_time_out) 9389103575aSMike Christie return -ETIMEDOUT; 9399103575aSMike Christie else if (udev->qfull_time_out > 0) 9409103575aSMike Christie tmo = udev->qfull_time_out; 9419103575aSMike Christie else if (udev->cmd_time_out) 9429103575aSMike Christie tmo = udev->cmd_time_out; 9439103575aSMike Christie else 9449103575aSMike Christie tmo = TCMU_TIME_OUT; 9459103575aSMike Christie 9469103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 947af1dd7ffSMike Christie if (ret) 948af1dd7ffSMike Christie return ret; 949af1dd7ffSMike Christie 950a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); 951af1dd7ffSMike Christie pr_debug("adding cmd %u on dev %s to ring space wait queue\n", 952af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 953af1dd7ffSMike Christie return 0; 954af1dd7ffSMike Christie } 955af1dd7ffSMike Christie 9566fd0ce79SMike Christie /** 9576fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 9586fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 9596fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 9606fd0ce79SMike Christie * 9616fd0ce79SMike Christie * Returns: 9626fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 9636fd0ce79SMike Christie * 0 success 964af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 9656fd0ce79SMike Christie */ 966e7f41104SBart Van Assche static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) 9677c9e7a6fSAndy Grover { 9687c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 9697c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 9707c9e7a6fSAndy Grover size_t base_command_size, command_size; 9717c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 9727c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 9737c9e7a6fSAndy Grover struct iovec *iov; 974141685a3SXiubo Li int iov_cnt, ret; 9757c9e7a6fSAndy Grover uint32_t cmd_head; 9767c9e7a6fSAndy Grover uint64_t cdb_off; 977f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 978ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 9797c9e7a6fSAndy Grover 9806fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 9816fd0ce79SMike Christie 982892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 983892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 984892782caSMike Christie return -1; 985892782caSMike Christie } 986892782caSMike Christie 9876fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 9886fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 9896fd0ce79SMike Christie return -1; 9906fd0ce79SMike Christie } 9917c9e7a6fSAndy Grover 9927c9e7a6fSAndy Grover /* 9937c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 9947c9e7a6fSAndy Grover * also may be larger if the iov array is large. 9957c9e7a6fSAndy Grover * 996fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 997fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 998fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 999fe25cc34SXiubo Li * will only be used to do the checks. 1000fe25cc34SXiubo Li * 1001fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 1002fe25cc34SXiubo Li * cmd area memories. 10037c9e7a6fSAndy Grover */ 1004fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 1005fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 10067c9e7a6fSAndy Grover 1007a94a2572SXiubo Li if (!list_empty(&udev->qfull_queue)) 1008af1dd7ffSMike Christie goto queue; 10097c9e7a6fSAndy Grover 10107c9e7a6fSAndy Grover mb = udev->mb_addr; 10117c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 1012554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 1013554617b2SAndy Grover data_length > udev->data_size) { 1014554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 10153d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 10167c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 10176fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 10186fd0ce79SMike Christie return -1; 1019554617b2SAndy Grover } 10207c9e7a6fSAndy Grover 1021af1dd7ffSMike Christie if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 1022810b8153SMike Christie /* 1023810b8153SMike Christie * Don't leave commands partially setup because the unmap 1024810b8153SMike Christie * thread might need the blocks to make forward progress. 1025810b8153SMike Christie */ 1026810b8153SMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 1027810b8153SMike Christie tcmu_cmd_reset_dbi_cur(tcmu_cmd); 1028af1dd7ffSMike Christie goto queue; 10297c9e7a6fSAndy Grover } 10307c9e7a6fSAndy Grover 1031f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 1032f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 1033f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 1034f56574a2SAndy Grover 10357c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 10360ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 10370ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 10380ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 10390ad46af8SAndy Grover entry->hdr.kflags = 0; 10400ad46af8SAndy Grover entry->hdr.uflags = 0; 10419d62bc0eSXiubo Li tcmu_flush_dcache_range(entry, sizeof(*entry)); 10427c9e7a6fSAndy Grover 10437c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 10449d62bc0eSXiubo Li tcmu_flush_dcache_range(mb, sizeof(*mb)); 10457c9e7a6fSAndy Grover 10467c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 10477c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 10487c9e7a6fSAndy Grover } 10497c9e7a6fSAndy Grover 10507c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 1051b3743c71SXiubo Li memset(entry, 0, command_size); 10520ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 10537c9e7a6fSAndy Grover 10543d9b9555SAndy Grover /* Handle allocating space from the data area */ 1055b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 10567c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 1057f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 1058e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 1059e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 10601a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 1061b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 1062b6df4b79SXiubo Li copy_to_data_area); 10637c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 10647c9e7a6fSAndy Grover 1065e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 1066e4648b01SIlias Tsitsimpis iov_cnt = 0; 1067b3743c71SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 1068ab22d260SXiubo Li iov++; 10691a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, 10701a1fc0b8SMike Christie se_cmd->t_bidi_data_nents, &iov, &iov_cnt, 10711a1fc0b8SMike Christie false); 1072ab22d260SXiubo Li } 1073b3743c71SXiubo Li entry->req.iov_bidi_cnt = iov_cnt; 107426418649SSheng Yang 10759103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, 10769103575aSMike Christie &udev->cmd_timer); 10770d44374cSMike Christie if (ret) { 10780d44374cSMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 10796fd0ce79SMike Christie 10806fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 10816fd0ce79SMike Christie return -1; 10820d44374cSMike Christie } 10830d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 10840d44374cSMike Christie 1085fe25cc34SXiubo Li /* 1086fe25cc34SXiubo Li * Recalaulate the command's base size and size according 1087fe25cc34SXiubo Li * to the actual needs 1088fe25cc34SXiubo Li */ 1089fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 1090fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 1091fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 1092fe25cc34SXiubo Li 1093fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 1094fe25cc34SXiubo Li 10957c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 10967c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 10977c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 10987c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 10997c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 11007c9e7a6fSAndy Grover 11017c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 11027c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 11037c9e7a6fSAndy Grover 1104a94a2572SXiubo Li list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); 1105a94a2572SXiubo Li set_bit(TCMU_CMD_BIT_INFLIGHT, &tcmu_cmd->flags); 1106a94a2572SXiubo Li 11077c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 11087c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 11097c9e7a6fSAndy Grover 11106fd0ce79SMike Christie return 0; 1111af1dd7ffSMike Christie 1112af1dd7ffSMike Christie queue: 1113a94a2572SXiubo Li if (add_to_qfull_queue(tcmu_cmd)) { 1114af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1115af1dd7ffSMike Christie return -1; 1116af1dd7ffSMike Christie } 1117af1dd7ffSMike Christie 1118af1dd7ffSMike Christie return 1; 11197c9e7a6fSAndy Grover } 11207c9e7a6fSAndy Grover 112102eb924fSAndy Grover static sense_reason_t 112202eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 11237c9e7a6fSAndy Grover { 1124af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1125af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 11267c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 11276fd0ce79SMike Christie sense_reason_t scsi_ret; 1128af1dd7ffSMike Christie int ret; 11297c9e7a6fSAndy Grover 11307c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 11317c9e7a6fSAndy Grover if (!tcmu_cmd) 113202eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11337c9e7a6fSAndy Grover 1134af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1135af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1136af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 1137af1dd7ffSMike Christie if (ret < 0) 1138141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 11396fd0ce79SMike Christie return scsi_ret; 11407c9e7a6fSAndy Grover } 11417c9e7a6fSAndy Grover 11427c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 11437c9e7a6fSAndy Grover { 11447c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 11457c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 11466c3796d1Sbstroesser@ts.fujitsu.com bool read_len_valid = false; 11476c3796d1Sbstroesser@ts.fujitsu.com uint32_t read_len = se_cmd->data_length; 11487c9e7a6fSAndy Grover 1149b25c7863SSheng Yang /* 1150b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 11513d9b9555SAndy Grover * data area space and free cmd 1152b25c7863SSheng Yang */ 1153141685a3SXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 1154141685a3SXiubo Li goto out; 1155b25c7863SSheng Yang 1156a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 1157a94a2572SXiubo Li 1158141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 11597c9e7a6fSAndy Grover 11600ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 11610ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 11620ad46af8SAndy Grover cmd->se_cmd); 1163ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 11646c3796d1Sbstroesser@ts.fujitsu.com goto done; 11656c3796d1Sbstroesser@ts.fujitsu.com } 11666c3796d1Sbstroesser@ts.fujitsu.com 11676c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->data_direction == DMA_FROM_DEVICE && 11686c3796d1Sbstroesser@ts.fujitsu.com (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { 11696c3796d1Sbstroesser@ts.fujitsu.com read_len_valid = true; 11706c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.read_len < read_len) 11716c3796d1Sbstroesser@ts.fujitsu.com read_len = entry->rsp.read_len; 11726c3796d1Sbstroesser@ts.fujitsu.com } 11736c3796d1Sbstroesser@ts.fujitsu.com 11746c3796d1Sbstroesser@ts.fujitsu.com if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1175406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 11766c3796d1Sbstroesser@ts.fujitsu.com if (!read_len_valid ) 11776c3796d1Sbstroesser@ts.fujitsu.com goto done; 11786c3796d1Sbstroesser@ts.fujitsu.com else 11796c3796d1Sbstroesser@ts.fujitsu.com se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; 11806c3796d1Sbstroesser@ts.fujitsu.com } 11816c3796d1Sbstroesser@ts.fujitsu.com if (se_cmd->se_cmd_flags & SCF_BIDI) { 118226418649SSheng Yang /* Get Data-In buffer before clean up */ 11836c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, true, read_len); 1184e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 11856c3796d1Sbstroesser@ts.fujitsu.com gather_data_area(udev, cmd, false, read_len); 11867c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1187141685a3SXiubo Li /* TODO: */ 11882bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 11892bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 11902bc396a2SIlias Tsitsimpis se_cmd->data_direction); 11917c9e7a6fSAndy Grover } 11927c9e7a6fSAndy Grover 11936c3796d1Sbstroesser@ts.fujitsu.com done: 11946c3796d1Sbstroesser@ts.fujitsu.com if (read_len_valid) { 11956c3796d1Sbstroesser@ts.fujitsu.com pr_debug("read_len = %d\n", read_len); 11966c3796d1Sbstroesser@ts.fujitsu.com target_complete_cmd_with_length(cmd->se_cmd, 11976c3796d1Sbstroesser@ts.fujitsu.com entry->rsp.scsi_status, read_len); 11986c3796d1Sbstroesser@ts.fujitsu.com } else 11997c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 12007c9e7a6fSAndy Grover 1201141685a3SXiubo Li out: 1202141685a3SXiubo Li cmd->se_cmd = NULL; 1203b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1204141685a3SXiubo Li tcmu_free_cmd(cmd); 12057c9e7a6fSAndy Grover } 12067c9e7a6fSAndy Grover 1207a94a2572SXiubo Li static void tcmu_set_next_deadline(struct list_head *queue, 1208a94a2572SXiubo Li struct timer_list *timer) 1209a94a2572SXiubo Li { 1210a94a2572SXiubo Li struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1211a94a2572SXiubo Li unsigned long deadline = 0; 1212a94a2572SXiubo Li 1213a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, queue, queue_entry) { 1214a94a2572SXiubo Li if (!time_after(jiffies, tcmu_cmd->deadline)) { 1215a94a2572SXiubo Li deadline = tcmu_cmd->deadline; 1216a94a2572SXiubo Li break; 1217a94a2572SXiubo Li } 1218a94a2572SXiubo Li } 1219a94a2572SXiubo Li 1220a94a2572SXiubo Li if (deadline) 1221a94a2572SXiubo Li mod_timer(timer, deadline); 1222a94a2572SXiubo Li else 1223a94a2572SXiubo Li del_timer(timer); 1224a94a2572SXiubo Li } 1225a94a2572SXiubo Li 12267c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 12277c9e7a6fSAndy Grover { 12287c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 1229a94a2572SXiubo Li struct tcmu_cmd *cmd; 12307c9e7a6fSAndy Grover int handled = 0; 12317c9e7a6fSAndy Grover 12327c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 12337c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 12347c9e7a6fSAndy Grover return 0; 12357c9e7a6fSAndy Grover } 12367c9e7a6fSAndy Grover 12377c9e7a6fSAndy Grover mb = udev->mb_addr; 12387c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 12397c9e7a6fSAndy Grover 12406aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 12417c9e7a6fSAndy Grover 12427c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 12437c9e7a6fSAndy Grover 12447c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 12457c9e7a6fSAndy Grover 12460ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 12470ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12480ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12490ad46af8SAndy Grover udev->cmdr_size); 12507c9e7a6fSAndy Grover continue; 12517c9e7a6fSAndy Grover } 12520ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 12537c9e7a6fSAndy Grover 1254d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 12557c9e7a6fSAndy Grover if (!cmd) { 125688cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 125788cf1073SMike Christie entry->hdr.cmd_id); 12587c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 12597c9e7a6fSAndy Grover break; 12607c9e7a6fSAndy Grover } 12617c9e7a6fSAndy Grover 12627c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 12637c9e7a6fSAndy Grover 12640ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 12650ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 12660ad46af8SAndy Grover udev->cmdr_size); 12677c9e7a6fSAndy Grover 12687c9e7a6fSAndy Grover handled++; 12697c9e7a6fSAndy Grover } 12707c9e7a6fSAndy Grover 12719103575aSMike Christie if (mb->cmd_tail == mb->cmd_head) { 12729103575aSMike Christie /* no more pending commands */ 12739103575aSMike Christie del_timer(&udev->cmd_timer); 12749103575aSMike Christie 1275a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) { 1276af1dd7ffSMike Christie /* 12779103575aSMike Christie * no more pending or waiting commands so try to 12789103575aSMike Christie * reclaim blocks if needed. 1279af1dd7ffSMike Christie */ 12809103575aSMike Christie if (atomic_read(&global_db_count) > 128180eb8761SMike Christie tcmu_global_max_blocks) 1282af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1283af1dd7ffSMike Christie } 1284a94a2572SXiubo Li } else if (udev->cmd_time_out) { 1285a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 12869103575aSMike Christie } 12877c9e7a6fSAndy Grover 12887c9e7a6fSAndy Grover return handled; 12897c9e7a6fSAndy Grover } 12907c9e7a6fSAndy Grover 12917c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 12927c9e7a6fSAndy Grover { 12937c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 1294af1dd7ffSMike Christie struct tcmu_dev *udev = cmd->tcmu_dev; 1295af1dd7ffSMike Christie u8 scsi_status; 1296af1dd7ffSMike Christie struct se_cmd *se_cmd; 1297af1dd7ffSMike Christie bool is_running; 12987c9e7a6fSAndy Grover 12997c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 13007c9e7a6fSAndy Grover return 0; 13017c9e7a6fSAndy Grover 1302611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 13037c9e7a6fSAndy Grover return 0; 13047c9e7a6fSAndy Grover 1305a94a2572SXiubo Li is_running = test_bit(TCMU_CMD_BIT_INFLIGHT, &cmd->flags); 130645dc488cSMike Christie se_cmd = cmd->se_cmd; 13077c9e7a6fSAndy Grover 1308af1dd7ffSMike Christie if (is_running) { 13099103575aSMike Christie /* 13109103575aSMike Christie * If cmd_time_out is disabled but qfull is set deadline 13119103575aSMike Christie * will only reflect the qfull timeout. Ignore it. 13129103575aSMike Christie */ 13139103575aSMike Christie if (!udev->cmd_time_out) 13149103575aSMike Christie return 0; 13159103575aSMike Christie 1316af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 1317af1dd7ffSMike Christie /* 1318af1dd7ffSMike Christie * target_complete_cmd will translate this to LUN COMM FAILURE 1319af1dd7ffSMike Christie */ 1320af1dd7ffSMike Christie scsi_status = SAM_STAT_CHECK_CONDITION; 132140d883b0SXiubo Li list_del_init(&cmd->queue_entry); 1322af1dd7ffSMike Christie } else { 132340d883b0SXiubo Li list_del_init(&cmd->queue_entry); 1324af1dd7ffSMike Christie idr_remove(&udev->commands, id); 1325af1dd7ffSMike Christie tcmu_free_cmd(cmd); 1326af1dd7ffSMike Christie scsi_status = SAM_STAT_TASK_SET_FULL; 1327af1dd7ffSMike Christie } 13289103575aSMike Christie 13299103575aSMike Christie pr_debug("Timing out cmd %u on dev %s that is %s.\n", 13309103575aSMike Christie id, udev->name, is_running ? "inflight" : "queued"); 13319103575aSMike Christie 1332af1dd7ffSMike Christie target_complete_cmd(se_cmd, scsi_status); 13337c9e7a6fSAndy Grover return 0; 13347c9e7a6fSAndy Grover } 13357c9e7a6fSAndy Grover 13369103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 13377c9e7a6fSAndy Grover { 1338488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1339488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1340488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1341488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 13427c9e7a6fSAndy Grover 1343af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 13447c9e7a6fSAndy Grover } 13457c9e7a6fSAndy Grover 13469103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 13479103575aSMike Christie { 13489103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 13499103575aSMike Christie 13509103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 13519103575aSMike Christie tcmu_device_timedout(udev); 13529103575aSMike Christie } 13539103575aSMike Christie 13549103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 13559103575aSMike Christie { 13569103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 13579103575aSMike Christie 13589103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 13599103575aSMike Christie tcmu_device_timedout(udev); 13609103575aSMike Christie } 13619103575aSMike Christie 13627c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 13637c9e7a6fSAndy Grover { 13647c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 13657c9e7a6fSAndy Grover 13667c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 13677c9e7a6fSAndy Grover if (!tcmu_hba) 13687c9e7a6fSAndy Grover return -ENOMEM; 13697c9e7a6fSAndy Grover 13707c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 13717c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 13727c9e7a6fSAndy Grover 13737c9e7a6fSAndy Grover return 0; 13747c9e7a6fSAndy Grover } 13757c9e7a6fSAndy Grover 13767c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 13777c9e7a6fSAndy Grover { 13787c9e7a6fSAndy Grover kfree(hba->hba_ptr); 13797c9e7a6fSAndy Grover hba->hba_ptr = NULL; 13807c9e7a6fSAndy Grover } 13817c9e7a6fSAndy Grover 13827c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 13837c9e7a6fSAndy Grover { 13847c9e7a6fSAndy Grover struct tcmu_dev *udev; 13857c9e7a6fSAndy Grover 13867c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 13877c9e7a6fSAndy Grover if (!udev) 13887c9e7a6fSAndy Grover return NULL; 1389f3cdbe39SMike Christie kref_init(&udev->kref); 13907c9e7a6fSAndy Grover 13917c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 13927c9e7a6fSAndy Grover if (!udev->name) { 13937c9e7a6fSAndy Grover kfree(udev); 13947c9e7a6fSAndy Grover return NULL; 13957c9e7a6fSAndy Grover } 13967c9e7a6fSAndy Grover 13977c9e7a6fSAndy Grover udev->hba = hba; 1398af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 13999103575aSMike Christie udev->qfull_time_out = -1; 14007c9e7a6fSAndy Grover 140180eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1402b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 14037c9e7a6fSAndy Grover 1404ff07e4a4SMike Christie INIT_LIST_HEAD(&udev->node); 1405488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1406a94a2572SXiubo Li INIT_LIST_HEAD(&udev->qfull_queue); 1407a94a2572SXiubo Li INIT_LIST_HEAD(&udev->inflight_queue); 14087c9e7a6fSAndy Grover idr_init(&udev->commands); 14097c9e7a6fSAndy Grover 14109103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 14119103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 14127c9e7a6fSAndy Grover 1413c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1414c22adc0bSXiubo Li 14157c9e7a6fSAndy Grover return &udev->se_dev; 14167c9e7a6fSAndy Grover } 14177c9e7a6fSAndy Grover 1418a94a2572SXiubo Li static bool run_qfull_queue(struct tcmu_dev *udev, bool fail) 1419af1dd7ffSMike Christie { 1420af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1421af1dd7ffSMike Christie LIST_HEAD(cmds); 1422af1dd7ffSMike Christie bool drained = true; 1423af1dd7ffSMike Christie sense_reason_t scsi_ret; 1424af1dd7ffSMike Christie int ret; 1425af1dd7ffSMike Christie 1426a94a2572SXiubo Li if (list_empty(&udev->qfull_queue)) 1427af1dd7ffSMike Christie return true; 1428af1dd7ffSMike Christie 1429892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1430af1dd7ffSMike Christie 1431a94a2572SXiubo Li list_splice_init(&udev->qfull_queue, &cmds); 1432af1dd7ffSMike Christie 1433a94a2572SXiubo Li list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { 1434a94a2572SXiubo Li list_del_init(&tcmu_cmd->queue_entry); 1435af1dd7ffSMike Christie 1436af1dd7ffSMike Christie pr_debug("removing cmd %u on dev %s from queue\n", 1437af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 1438af1dd7ffSMike Christie 1439892782caSMike Christie if (fail) { 1440892782caSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1441892782caSMike Christie /* 1442892782caSMike Christie * We were not able to even start the command, so 1443892782caSMike Christie * fail with busy to allow a retry in case runner 1444892782caSMike Christie * was only temporarily down. If the device is being 1445892782caSMike Christie * removed then LIO core will do the right thing and 1446892782caSMike Christie * fail the retry. 1447892782caSMike Christie */ 1448892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1449892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1450892782caSMike Christie continue; 1451892782caSMike Christie } 1452892782caSMike Christie 1453af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1454af1dd7ffSMike Christie if (ret < 0) { 1455af1dd7ffSMike Christie pr_debug("cmd %u on dev %s failed with %u\n", 1456af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name, scsi_ret); 1457af1dd7ffSMike Christie 1458af1dd7ffSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1459af1dd7ffSMike Christie /* 1460af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1461af1dd7ffSMike Christie * drops it. 1462af1dd7ffSMike Christie */ 1463af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1464af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1465af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1466af1dd7ffSMike Christie } else if (ret > 0) { 1467af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1468af1dd7ffSMike Christie /* 1469af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1470af1dd7ffSMike Christie * the queue 1471af1dd7ffSMike Christie */ 1472a94a2572SXiubo Li list_splice_tail(&cmds, &udev->qfull_queue); 1473af1dd7ffSMike Christie drained = false; 1474a94a2572SXiubo Li break; 1475af1dd7ffSMike Christie } 1476af1dd7ffSMike Christie } 1477a94a2572SXiubo Li 1478a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 1479af1dd7ffSMike Christie return drained; 1480af1dd7ffSMike Christie } 1481af1dd7ffSMike Christie 14827c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 14837c9e7a6fSAndy Grover { 1484af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14857c9e7a6fSAndy Grover 1486af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1487af1dd7ffSMike Christie tcmu_handle_completions(udev); 1488a94a2572SXiubo Li run_qfull_queue(udev, false); 1489af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 14907c9e7a6fSAndy Grover 14917c9e7a6fSAndy Grover return 0; 14927c9e7a6fSAndy Grover } 14937c9e7a6fSAndy Grover 14947c9e7a6fSAndy Grover /* 14957c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 14967c9e7a6fSAndy Grover * and this stuff must come along. 14977c9e7a6fSAndy Grover */ 14987c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 14997c9e7a6fSAndy Grover { 15007c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 15017c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 15027c9e7a6fSAndy Grover 15037c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 15047c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 15057c9e7a6fSAndy Grover return -1; 15067c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 15077c9e7a6fSAndy Grover } 15087c9e7a6fSAndy Grover return -1; 15097c9e7a6fSAndy Grover } 15107c9e7a6fSAndy Grover 1511b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1512b6df4b79SXiubo Li { 1513b6df4b79SXiubo Li struct page *page; 1514b6df4b79SXiubo Li 1515b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1516b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1517b6df4b79SXiubo Li if (likely(page)) { 1518b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1519b6df4b79SXiubo Li return page; 1520b6df4b79SXiubo Li } 1521b6df4b79SXiubo Li 1522b6df4b79SXiubo Li /* 1523c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1524c1c390baSMike Christie * data iov passed to it. 1525b6df4b79SXiubo Li */ 1526c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1527c1c390baSMike Christie dbi, udev->name); 1528c1c390baSMike Christie page = NULL; 1529b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1530b6df4b79SXiubo Li 1531b6df4b79SXiubo Li return page; 1532b6df4b79SXiubo Li } 1533b6df4b79SXiubo Li 153469589c9bSSouptick Joarder static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 15357c9e7a6fSAndy Grover { 153611bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 15377c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 15387c9e7a6fSAndy Grover struct page *page; 15397c9e7a6fSAndy Grover unsigned long offset; 15407c9e7a6fSAndy Grover void *addr; 15417c9e7a6fSAndy Grover 154211bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 15437c9e7a6fSAndy Grover if (mi < 0) 15447c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 15457c9e7a6fSAndy Grover 15467c9e7a6fSAndy Grover /* 15477c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 15487c9e7a6fSAndy Grover * to use mem[N]. 15497c9e7a6fSAndy Grover */ 15507c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 15517c9e7a6fSAndy Grover 1552141685a3SXiubo Li if (offset < udev->data_off) { 1553141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 15547c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 15557c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1556141685a3SXiubo Li } else { 1557141685a3SXiubo Li uint32_t dbi; 1558141685a3SXiubo Li 1559b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1560141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1561b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1562b6df4b79SXiubo Li if (!page) 1563c1c390baSMike Christie return VM_FAULT_SIGBUS; 1564141685a3SXiubo Li } 1565141685a3SXiubo Li 15667c9e7a6fSAndy Grover get_page(page); 15677c9e7a6fSAndy Grover vmf->page = page; 15687c9e7a6fSAndy Grover return 0; 15697c9e7a6fSAndy Grover } 15707c9e7a6fSAndy Grover 15717c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 15727c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 15737c9e7a6fSAndy Grover }; 15747c9e7a6fSAndy Grover 15757c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 15767c9e7a6fSAndy Grover { 15777c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15787c9e7a6fSAndy Grover 15797c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 15807c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 15817c9e7a6fSAndy Grover 15827c9e7a6fSAndy Grover vma->vm_private_data = udev; 15837c9e7a6fSAndy Grover 15847c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 158580eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 15867c9e7a6fSAndy Grover return -EINVAL; 15877c9e7a6fSAndy Grover 15887c9e7a6fSAndy Grover return 0; 15897c9e7a6fSAndy Grover } 15907c9e7a6fSAndy Grover 15917c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 15927c9e7a6fSAndy Grover { 15937c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15947c9e7a6fSAndy Grover 15957c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 15967c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 15977c9e7a6fSAndy Grover return -EBUSY; 15987c9e7a6fSAndy Grover 1599b6df4b79SXiubo Li udev->inode = inode; 16009260695dSMike Christie kref_get(&udev->kref); 1601b6df4b79SXiubo Li 16027c9e7a6fSAndy Grover pr_debug("open\n"); 16037c9e7a6fSAndy Grover 16047c9e7a6fSAndy Grover return 0; 16057c9e7a6fSAndy Grover } 16067c9e7a6fSAndy Grover 1607f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1608f3cdbe39SMike Christie { 1609f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1610f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1611f3cdbe39SMike Christie 1612f3cdbe39SMike Christie kfree(udev->uio_info.name); 1613f3cdbe39SMike Christie kfree(udev->name); 1614f3cdbe39SMike Christie kfree(udev); 1615f3cdbe39SMike Christie } 1616f3cdbe39SMike Christie 1617c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1618c22adc0bSXiubo Li { 1619c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1620c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1621c22adc0bSXiubo Li return 0; 1622c22adc0bSXiubo Li } 1623c22adc0bSXiubo Li return -EINVAL; 1624c22adc0bSXiubo Li } 1625c22adc0bSXiubo Li 1626bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1627bf99ec13SMike Christie int start, int end) 1628c22adc0bSXiubo Li { 1629c22adc0bSXiubo Li int i; 1630c22adc0bSXiubo Li struct page *page; 1631c22adc0bSXiubo Li 1632bf99ec13SMike Christie for (i = start; i < end; i++) { 1633bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1634c22adc0bSXiubo Li if (page) { 1635c22adc0bSXiubo Li __free_page(page); 1636c22adc0bSXiubo Li atomic_dec(&global_db_count); 1637c22adc0bSXiubo Li } 1638c22adc0bSXiubo Li } 1639c22adc0bSXiubo Li } 1640c22adc0bSXiubo Li 1641f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1642f3cdbe39SMike Christie { 1643f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1644f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1645c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1646c22adc0bSXiubo Li bool all_expired = true; 1647c22adc0bSXiubo Li int i; 1648c22adc0bSXiubo Li 1649c22adc0bSXiubo Li vfree(udev->mb_addr); 1650c22adc0bSXiubo Li udev->mb_addr = NULL; 1651c22adc0bSXiubo Li 1652488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1653488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1654488ebe4cSMike Christie list_del(&udev->timedout_entry); 1655488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1656488ebe4cSMike Christie 1657c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 16586fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1659c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1660c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1661c22adc0bSXiubo Li all_expired = false; 1662c22adc0bSXiubo Li } 1663c22adc0bSXiubo Li idr_destroy(&udev->commands); 1664c22adc0bSXiubo Li WARN_ON(!all_expired); 1665c22adc0bSXiubo Li 1666bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 166798effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 1668bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1669f3cdbe39SMike Christie 1670f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1671f3cdbe39SMike Christie } 1672f3cdbe39SMike Christie 16737c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 16747c9e7a6fSAndy Grover { 16757c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 16767c9e7a6fSAndy Grover 16777c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 16787c9e7a6fSAndy Grover 16797c9e7a6fSAndy Grover pr_debug("close\n"); 16809260695dSMike Christie /* release ref from open */ 1681f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 16827c9e7a6fSAndy Grover return 0; 16837c9e7a6fSAndy Grover } 16847c9e7a6fSAndy Grover 16859de3a1efSMike Christie static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1686b3af66e2SMike Christie { 1687b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1688b3af66e2SMike Christie 1689b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 16909de3a1efSMike Christie return 0; 1691b849b456SKenjiro Nakayama 1692b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 16939de3a1efSMike Christie return 0; 1694b849b456SKenjiro Nakayama 16953228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1696b3af66e2SMike Christie 1697bdaeedc1SMike Christie if (tcmu_netlink_blocked) { 1698bdaeedc1SMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1699bdaeedc1SMike Christie pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, 1700bdaeedc1SMike Christie udev->name); 1701bdaeedc1SMike Christie return -EAGAIN; 1702bdaeedc1SMike Christie } 1703b3af66e2SMike Christie 1704b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 17053228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 17069de3a1efSMike Christie pr_warn("netlink cmd %d already executing on %s\n", 17079de3a1efSMike Christie nl_cmd->cmd, udev->name); 17089de3a1efSMike Christie return -EBUSY; 1709b3af66e2SMike Christie } 1710b3af66e2SMike Christie 1711b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1712b3af66e2SMike Christie nl_cmd->cmd = cmd; 17133228691fSMike Christie nl_cmd->udev = udev; 1714b3af66e2SMike Christie init_completion(&nl_cmd->complete); 17153228691fSMike Christie INIT_LIST_HEAD(&nl_cmd->nl_list); 1716b3af66e2SMike Christie 17173228691fSMike Christie list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); 17183228691fSMike Christie 17193228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 17209de3a1efSMike Christie return 0; 1721b3af66e2SMike Christie } 1722b3af66e2SMike Christie 1723b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1724b3af66e2SMike Christie { 1725b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1726b3af66e2SMike Christie int ret; 1727b3af66e2SMike Christie 1728b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1729b3af66e2SMike Christie return 0; 1730b3af66e2SMike Christie 1731b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1732b849b456SKenjiro Nakayama return 0; 1733b849b456SKenjiro Nakayama 1734b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1735b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1736b3af66e2SMike Christie 17373228691fSMike Christie mutex_lock(&tcmu_nl_cmd_mutex); 1738b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1739b3af66e2SMike Christie ret = nl_cmd->status; 17403228691fSMike Christie mutex_unlock(&tcmu_nl_cmd_mutex); 1741b3af66e2SMike Christie 174285fae482SLuis de Bethencourt return ret; 1743b3af66e2SMike Christie } 1744b3af66e2SMike Christie 17450e5aee39SZhu Lingshan static int tcmu_netlink_event_init(struct tcmu_dev *udev, 17460e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 17470e5aee39SZhu Lingshan struct sk_buff **buf, void **hdr) 17487c9e7a6fSAndy Grover { 17497c9e7a6fSAndy Grover struct sk_buff *skb; 17507c9e7a6fSAndy Grover void *msg_header; 17516e14eab9SNicholas Bellinger int ret = -ENOMEM; 17527c9e7a6fSAndy Grover 17537c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 17547c9e7a6fSAndy Grover if (!skb) 17556e14eab9SNicholas Bellinger return ret; 17567c9e7a6fSAndy Grover 17577c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 17586e14eab9SNicholas Bellinger if (!msg_header) 17596e14eab9SNicholas Bellinger goto free_skb; 17607c9e7a6fSAndy Grover 1761b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 17626e14eab9SNicholas Bellinger if (ret < 0) 17636e14eab9SNicholas Bellinger goto free_skb; 17647c9e7a6fSAndy Grover 1765b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1766b3af66e2SMike Christie if (ret < 0) 1767b3af66e2SMike Christie goto free_skb; 1768b3af66e2SMike Christie 1769b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 17706e14eab9SNicholas Bellinger if (ret < 0) 17716e14eab9SNicholas Bellinger goto free_skb; 17727c9e7a6fSAndy Grover 17730e5aee39SZhu Lingshan *buf = skb; 17740e5aee39SZhu Lingshan *hdr = msg_header; 17750e5aee39SZhu Lingshan return ret; 17760e5aee39SZhu Lingshan 17770e5aee39SZhu Lingshan free_skb: 17780e5aee39SZhu Lingshan nlmsg_free(skb); 17790e5aee39SZhu Lingshan return ret; 17802d76443eSMike Christie } 17812d76443eSMike Christie 17820e5aee39SZhu Lingshan static int tcmu_netlink_event_send(struct tcmu_dev *udev, 17830e5aee39SZhu Lingshan enum tcmu_genl_cmd cmd, 178406add777SMike Christie struct sk_buff *skb, void *msg_header) 17850e5aee39SZhu Lingshan { 178606add777SMike Christie int ret; 17878a45885cSBryant G. Ly 1788053c095aSJohannes Berg genlmsg_end(skb, msg_header); 17897c9e7a6fSAndy Grover 17909de3a1efSMike Christie ret = tcmu_init_genl_cmd_reply(udev, cmd); 17919de3a1efSMike Christie if (ret) { 17929de3a1efSMike Christie nlmsg_free(skb); 17939de3a1efSMike Christie return ret; 17949de3a1efSMike Christie } 1795b3af66e2SMike Christie 179620c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 17977c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 17982ff717cdSCathy Avery 17992ff717cdSCathy Avery /* Wait during an add as the listener may not be up yet */ 18002ff717cdSCathy Avery if (ret == 0 || 18012ff717cdSCathy Avery (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) 18022ff717cdSCathy Avery return tcmu_wait_genl_cmd_reply(udev); 18032ff717cdSCathy Avery 18040e5aee39SZhu Lingshan return ret; 18050e5aee39SZhu Lingshan } 18067c9e7a6fSAndy Grover 1807e0c240acSZhu Lingshan static int tcmu_send_dev_add_event(struct tcmu_dev *udev) 1808e0c240acSZhu Lingshan { 1809e0c240acSZhu Lingshan struct sk_buff *skb = NULL; 1810e0c240acSZhu Lingshan void *msg_header = NULL; 1811e0c240acSZhu Lingshan int ret = 0; 1812e0c240acSZhu Lingshan 1813e0c240acSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, 1814e0c240acSZhu Lingshan &msg_header); 1815e0c240acSZhu Lingshan if (ret < 0) 18167c9e7a6fSAndy Grover return ret; 181706add777SMike Christie return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, 181806add777SMike Christie msg_header); 1819e0c240acSZhu Lingshan } 1820e0c240acSZhu Lingshan 1821f892bd8eSZhu Lingshan static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) 1822f892bd8eSZhu Lingshan { 1823f892bd8eSZhu Lingshan struct sk_buff *skb = NULL; 1824f892bd8eSZhu Lingshan void *msg_header = NULL; 1825f892bd8eSZhu Lingshan int ret = 0; 1826f892bd8eSZhu Lingshan 1827f892bd8eSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, 1828f892bd8eSZhu Lingshan &skb, &msg_header); 1829f892bd8eSZhu Lingshan if (ret < 0) 18306e14eab9SNicholas Bellinger return ret; 1831f892bd8eSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, 183206add777SMike Christie skb, msg_header); 18337c9e7a6fSAndy Grover } 18347c9e7a6fSAndy Grover 1835de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 18367c9e7a6fSAndy Grover { 18377c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 18387c9e7a6fSAndy Grover struct uio_info *info; 1839de8c5221SBryant G. Ly size_t size, used; 18407c9e7a6fSAndy Grover char *str; 18417c9e7a6fSAndy Grover 18427c9e7a6fSAndy Grover info = &udev->uio_info; 18437c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 18447c9e7a6fSAndy Grover udev->dev_config); 18457c9e7a6fSAndy Grover size += 1; /* for \0 */ 18467c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 18477c9e7a6fSAndy Grover if (!str) 18487c9e7a6fSAndy Grover return -ENOMEM; 18497c9e7a6fSAndy Grover 18507c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 18517c9e7a6fSAndy Grover if (udev->dev_config[0]) 18527c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 18537c9e7a6fSAndy Grover 1854ededd039SBryant G. Ly /* If the old string exists, free it */ 1855ededd039SBryant G. Ly kfree(info->name); 18567c9e7a6fSAndy Grover info->name = str; 18577c9e7a6fSAndy Grover 1858de8c5221SBryant G. Ly return 0; 1859de8c5221SBryant G. Ly } 1860de8c5221SBryant G. Ly 1861de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 1862de8c5221SBryant G. Ly { 1863de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 1864de8c5221SBryant G. Ly struct uio_info *info; 1865de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 1866de8c5221SBryant G. Ly int ret = 0; 1867de8c5221SBryant G. Ly 1868de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1869de8c5221SBryant G. Ly if (ret) 1870de8c5221SBryant G. Ly return ret; 1871de8c5221SBryant G. Ly 1872de8c5221SBryant G. Ly info = &udev->uio_info; 1873de8c5221SBryant G. Ly 1874c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 187598effe47SAndy Shevchenko udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); 1876c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 1877a24e7917SWei Yongjun if (!udev->data_bitmap) { 1878a24e7917SWei Yongjun ret = -ENOMEM; 187980eb8761SMike Christie goto err_bitmap_alloc; 1880a24e7917SWei Yongjun } 188180eb8761SMike Christie 1882141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 18837c9e7a6fSAndy Grover if (!udev->mb_addr) { 18847c9e7a6fSAndy Grover ret = -ENOMEM; 18857c9e7a6fSAndy Grover goto err_vzalloc; 18867c9e7a6fSAndy Grover } 18877c9e7a6fSAndy Grover 18887c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 18897c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 18907c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 189180eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 1892b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 18937c9e7a6fSAndy Grover 1894141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 18957c9e7a6fSAndy Grover mb = udev->mb_addr; 18960ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 18976c3796d1Sbstroesser@ts.fujitsu.com mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | TCMU_MAILBOX_FLAG_CAP_READ_LEN; 18987c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 18997c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 19007c9e7a6fSAndy Grover 19017c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 19027c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 190326418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 19047c9e7a6fSAndy Grover 1905ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 19067c9e7a6fSAndy Grover 19077c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 19080633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 190980eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 1910141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 19117c9e7a6fSAndy Grover 19127c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 19137c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 19147c9e7a6fSAndy Grover 19157c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 19167c9e7a6fSAndy Grover info->open = tcmu_open; 19177c9e7a6fSAndy Grover info->release = tcmu_release; 19187c9e7a6fSAndy Grover 19197c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 19207c9e7a6fSAndy Grover if (ret) 19217c9e7a6fSAndy Grover goto err_register; 19227c9e7a6fSAndy Grover 192381ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 192481ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 19257c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 192681ee28deSSheng Yang /* Other attributes can be configured in userspace */ 19273abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 19287c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 19299a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 19309a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 19317c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 19327c9e7a6fSAndy Grover 1933b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 1934b849b456SKenjiro Nakayama * module scope setting. 1935b849b456SKenjiro Nakayama */ 1936b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 1937b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 1938b849b456SKenjiro Nakayama 1939f3cdbe39SMike Christie /* 1940f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1941f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1942f3cdbe39SMike Christie */ 1943f3cdbe39SMike Christie kref_get(&udev->kref); 1944f3cdbe39SMike Christie 1945e0c240acSZhu Lingshan ret = tcmu_send_dev_add_event(udev); 19467c9e7a6fSAndy Grover if (ret) 19477c9e7a6fSAndy Grover goto err_netlink; 19487c9e7a6fSAndy Grover 1949b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1950b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1951b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1952b6df4b79SXiubo Li 19537c9e7a6fSAndy Grover return 0; 19547c9e7a6fSAndy Grover 19557c9e7a6fSAndy Grover err_netlink: 1956f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19577c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19587c9e7a6fSAndy Grover err_register: 19597c9e7a6fSAndy Grover vfree(udev->mb_addr); 1960c22adc0bSXiubo Li udev->mb_addr = NULL; 19617c9e7a6fSAndy Grover err_vzalloc: 196298effe47SAndy Shevchenko bitmap_free(udev->data_bitmap); 196380eb8761SMike Christie udev->data_bitmap = NULL; 196480eb8761SMike Christie err_bitmap_alloc: 19657c9e7a6fSAndy Grover kfree(info->name); 1966f3cdbe39SMike Christie info->name = NULL; 19677c9e7a6fSAndy Grover 19687c9e7a6fSAndy Grover return ret; 19697c9e7a6fSAndy Grover } 19707c9e7a6fSAndy Grover 19717c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 19727c9e7a6fSAndy Grover { 19737c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 197492634706SMike Christie 197592634706SMike Christie /* release ref from init */ 197692634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 197792634706SMike Christie } 197892634706SMike Christie 197992634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 198092634706SMike Christie { 198192634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 19827c9e7a6fSAndy Grover 19839103575aSMike Christie del_timer_sync(&udev->cmd_timer); 19849103575aSMike Christie del_timer_sync(&udev->qfull_timer); 19857c9e7a6fSAndy Grover 1986b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1987b6df4b79SXiubo Li list_del(&udev->node); 1988b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1989b6df4b79SXiubo Li 1990f892bd8eSZhu Lingshan tcmu_send_dev_remove_event(udev); 19917c9e7a6fSAndy Grover 19927c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 19939260695dSMike Christie 19949260695dSMike Christie /* release ref from configure */ 19959260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 19967c9e7a6fSAndy Grover } 19977c9e7a6fSAndy Grover 1998892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 1999892782caSMike Christie { 2000892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2001892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 2002892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2003892782caSMike Christie } 2004892782caSMike Christie 2005892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 2006892782caSMike Christie { 2007892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2008892782caSMike Christie 2009892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2010892782caSMike Christie goto unlock; 2011892782caSMike Christie 2012892782caSMike Christie /* complete IO that has executed successfully */ 2013892782caSMike Christie tcmu_handle_completions(udev); 2014892782caSMike Christie /* fail IO waiting to be queued */ 2015a94a2572SXiubo Li run_qfull_queue(udev, true); 2016892782caSMike Christie 2017892782caSMike Christie unlock: 2018892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2019892782caSMike Christie } 2020892782caSMike Christie 2021892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 2022892782caSMike Christie { 2023892782caSMike Christie struct tcmu_mailbox *mb; 2024892782caSMike Christie struct tcmu_cmd *cmd; 2025892782caSMike Christie int i; 2026892782caSMike Christie 2027892782caSMike Christie mutex_lock(&udev->cmdr_lock); 2028892782caSMike Christie 2029892782caSMike Christie idr_for_each_entry(&udev->commands, cmd, i) { 2030a94a2572SXiubo Li if (!test_bit(TCMU_CMD_BIT_INFLIGHT, &cmd->flags)) 2031892782caSMike Christie continue; 2032892782caSMike Christie 2033892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 2034892782caSMike Christie cmd->cmd_id, udev->name, 2035892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 2036892782caSMike Christie 2037892782caSMike Christie idr_remove(&udev->commands, i); 2038892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 2039a94a2572SXiubo Li list_del_init(&cmd->queue_entry); 2040892782caSMike Christie if (err_level == 1) { 2041892782caSMike Christie /* 2042892782caSMike Christie * Userspace was not able to start the 2043892782caSMike Christie * command or it is retryable. 2044892782caSMike Christie */ 2045892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 2046892782caSMike Christie } else { 2047892782caSMike Christie /* hard failure */ 2048892782caSMike Christie target_complete_cmd(cmd->se_cmd, 2049892782caSMike Christie SAM_STAT_CHECK_CONDITION); 2050892782caSMike Christie } 2051892782caSMike Christie } 2052892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 2053892782caSMike Christie tcmu_free_cmd(cmd); 2054892782caSMike Christie } 2055892782caSMike Christie 2056892782caSMike Christie mb = udev->mb_addr; 2057892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2058892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 2059892782caSMike Christie mb->cmd_tail, mb->cmd_head); 2060892782caSMike Christie 2061892782caSMike Christie udev->cmdr_last_cleaned = 0; 2062892782caSMike Christie mb->cmd_tail = 0; 2063892782caSMike Christie mb->cmd_head = 0; 2064892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 2065892782caSMike Christie 2066892782caSMike Christie del_timer(&udev->cmd_timer); 2067892782caSMike Christie 2068892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 2069892782caSMike Christie } 2070892782caSMike Christie 20717c9e7a6fSAndy Grover enum { 20723abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 207380eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 20747c9e7a6fSAndy Grover }; 20757c9e7a6fSAndy Grover 20767c9e7a6fSAndy Grover static match_table_t tokens = { 20777c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 20780e0d7526SMike Christie {Opt_dev_size, "dev_size=%s"}, 2079b60cb1f8SMike Christie {Opt_hw_block_size, "hw_block_size=%d"}, 2080b60cb1f8SMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%d"}, 2081b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 2082c97840c8SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%d"}, 20837c9e7a6fSAndy Grover {Opt_err, NULL} 20847c9e7a6fSAndy Grover }; 20857c9e7a6fSAndy Grover 20863abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 20873abaa2bfSMike Christie { 2088b60cb1f8SMike Christie int val, ret; 20893abaa2bfSMike Christie 2090b60cb1f8SMike Christie ret = match_int(arg, &val); 20913abaa2bfSMike Christie if (ret < 0) { 2092b60cb1f8SMike Christie pr_err("match_int() failed for dev attrib. Error %d.\n", 2093b60cb1f8SMike Christie ret); 20943abaa2bfSMike Christie return ret; 20953abaa2bfSMike Christie } 2096b60cb1f8SMike Christie 2097b60cb1f8SMike Christie if (val <= 0) { 2098b60cb1f8SMike Christie pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", 2099b60cb1f8SMike Christie val); 21003abaa2bfSMike Christie return -EINVAL; 21013abaa2bfSMike Christie } 2102b60cb1f8SMike Christie *dev_attrib = val; 21033abaa2bfSMike Christie return 0; 21043abaa2bfSMike Christie } 21053abaa2bfSMike Christie 2106c97840c8SMike Christie static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) 2107c97840c8SMike Christie { 2108c97840c8SMike Christie int val, ret; 2109c97840c8SMike Christie 2110c97840c8SMike Christie ret = match_int(arg, &val); 2111c97840c8SMike Christie if (ret < 0) { 2112c97840c8SMike Christie pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", 2113c97840c8SMike Christie ret); 2114c97840c8SMike Christie return ret; 2115c97840c8SMike Christie } 2116c97840c8SMike Christie 2117c97840c8SMike Christie if (val <= 0) { 2118c97840c8SMike Christie pr_err("Invalid max_data_area %d.\n", val); 2119c97840c8SMike Christie return -EINVAL; 2120c97840c8SMike Christie } 2121c97840c8SMike Christie 2122c97840c8SMike Christie mutex_lock(&udev->cmdr_lock); 2123c97840c8SMike Christie if (udev->data_bitmap) { 2124c97840c8SMike Christie pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); 2125c97840c8SMike Christie ret = -EINVAL; 2126c97840c8SMike Christie goto unlock; 2127c97840c8SMike Christie } 2128c97840c8SMike Christie 2129c97840c8SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); 2130c97840c8SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 2131c97840c8SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 2132c97840c8SMike Christie val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 2133c97840c8SMike Christie udev->max_blocks = tcmu_global_max_blocks; 2134c97840c8SMike Christie } 2135c97840c8SMike Christie 2136c97840c8SMike Christie unlock: 2137c97840c8SMike Christie mutex_unlock(&udev->cmdr_lock); 2138c97840c8SMike Christie return ret; 2139c97840c8SMike Christie } 2140c97840c8SMike Christie 21417c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 21427c9e7a6fSAndy Grover const char *page, ssize_t count) 21437c9e7a6fSAndy Grover { 21447c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 21450e0d7526SMike Christie char *orig, *ptr, *opts; 21467c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 2147c97840c8SMike Christie int ret = 0, token; 21487c9e7a6fSAndy Grover 21497c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 21507c9e7a6fSAndy Grover if (!opts) 21517c9e7a6fSAndy Grover return -ENOMEM; 21527c9e7a6fSAndy Grover 21537c9e7a6fSAndy Grover orig = opts; 21547c9e7a6fSAndy Grover 21557c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 21567c9e7a6fSAndy Grover if (!*ptr) 21577c9e7a6fSAndy Grover continue; 21587c9e7a6fSAndy Grover 21597c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 21607c9e7a6fSAndy Grover switch (token) { 21617c9e7a6fSAndy Grover case Opt_dev_config: 21627c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 21637c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 21647c9e7a6fSAndy Grover ret = -EINVAL; 21657c9e7a6fSAndy Grover break; 21667c9e7a6fSAndy Grover } 21677c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 21687c9e7a6fSAndy Grover break; 21697c9e7a6fSAndy Grover case Opt_dev_size: 21700e0d7526SMike Christie ret = match_u64(&args[0], &udev->dev_size); 21717c9e7a6fSAndy Grover if (ret < 0) 21720e0d7526SMike Christie pr_err("match_u64() failed for dev_size=. Error %d.\n", 21730e0d7526SMike Christie ret); 21747c9e7a6fSAndy Grover break; 21759c1cd1b6SAndy Grover case Opt_hw_block_size: 21763abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21773abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 21789c1cd1b6SAndy Grover break; 21793abaa2bfSMike Christie case Opt_hw_max_sectors: 21803abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 21813abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 21829c1cd1b6SAndy Grover break; 2183b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 2184b60cb1f8SMike Christie ret = match_int(&args[0], &udev->nl_reply_supported); 2185b849b456SKenjiro Nakayama if (ret < 0) 2186b60cb1f8SMike Christie pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", 2187b60cb1f8SMike Christie ret); 2188b849b456SKenjiro Nakayama break; 218980eb8761SMike Christie case Opt_max_data_area_mb: 2190c97840c8SMike Christie ret = tcmu_set_max_blocks_param(udev, &args[0]); 219180eb8761SMike Christie break; 21927c9e7a6fSAndy Grover default: 21937c9e7a6fSAndy Grover break; 21947c9e7a6fSAndy Grover } 21952579325cSMike Christie 21962579325cSMike Christie if (ret) 21972579325cSMike Christie break; 21987c9e7a6fSAndy Grover } 21997c9e7a6fSAndy Grover 22007c9e7a6fSAndy Grover kfree(orig); 22017c9e7a6fSAndy Grover return (!ret) ? count : ret; 22027c9e7a6fSAndy Grover } 22037c9e7a6fSAndy Grover 22047c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 22057c9e7a6fSAndy Grover { 22067c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 22077c9e7a6fSAndy Grover ssize_t bl = 0; 22087c9e7a6fSAndy Grover 22097c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 22107c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 22110e0d7526SMike Christie bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); 221280eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 221380eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 22147c9e7a6fSAndy Grover 22157c9e7a6fSAndy Grover return bl; 22167c9e7a6fSAndy Grover } 22177c9e7a6fSAndy Grover 22187c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 22197c9e7a6fSAndy Grover { 22207c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 22217c9e7a6fSAndy Grover 22227c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 22237c9e7a6fSAndy Grover dev->dev_attrib.block_size); 22247c9e7a6fSAndy Grover } 22257c9e7a6fSAndy Grover 22267c9e7a6fSAndy Grover static sense_reason_t 22277c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 22287c9e7a6fSAndy Grover { 222902eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 22309c1cd1b6SAndy Grover } 22319c1cd1b6SAndy Grover 22327d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 22337d7a7435SNicholas Bellinger { 22347d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22357d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2236b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22377d7a7435SNicholas Bellinger 22387d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 22397d7a7435SNicholas Bellinger } 22407d7a7435SNicholas Bellinger 22417d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 22427d7a7435SNicholas Bellinger size_t count) 22437d7a7435SNicholas Bellinger { 22447d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 22457d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 22467d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 22477d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 22487d7a7435SNicholas Bellinger u32 val; 22497d7a7435SNicholas Bellinger int ret; 22507d7a7435SNicholas Bellinger 22517d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 22527d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 22537d7a7435SNicholas Bellinger return -EINVAL; 22547d7a7435SNicholas Bellinger } 22557d7a7435SNicholas Bellinger 22567d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 22577d7a7435SNicholas Bellinger if (ret < 0) 22587d7a7435SNicholas Bellinger return ret; 22597d7a7435SNicholas Bellinger 22607d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 22617d7a7435SNicholas Bellinger return count; 22627d7a7435SNicholas Bellinger } 22637d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 22647d7a7435SNicholas Bellinger 22659103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 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 22719103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 22729103575aSMike Christie udev->qfull_time_out : 22739103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 22749103575aSMike Christie } 22759103575aSMike Christie 22769103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 22779103575aSMike Christie const char *page, size_t count) 22789103575aSMike Christie { 22799103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 22809103575aSMike Christie struct se_dev_attrib, da_group); 22819103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22829103575aSMike Christie s32 val; 22839103575aSMike Christie int ret; 22849103575aSMike Christie 22859103575aSMike Christie ret = kstrtos32(page, 0, &val); 22869103575aSMike Christie if (ret < 0) 22879103575aSMike Christie return ret; 22889103575aSMike Christie 22899103575aSMike Christie if (val >= 0) { 22909103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 2291125966dbSPrasanna Kumar Kalever } else if (val == -1) { 2292125966dbSPrasanna Kumar Kalever udev->qfull_time_out = val; 22939103575aSMike Christie } else { 22949103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 22959103575aSMike Christie return -EINVAL; 22969103575aSMike Christie } 22979103575aSMike Christie return count; 22989103575aSMike Christie } 22999103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 23009103575aSMike Christie 230180eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 230280eb8761SMike Christie { 230380eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 230480eb8761SMike Christie struct se_dev_attrib, da_group); 230580eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 230680eb8761SMike Christie 230780eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 230880eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 230980eb8761SMike Christie } 231080eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 231180eb8761SMike Christie 23122d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2313ee018252SBryant G. Ly { 2314ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2315ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2316ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2317ee018252SBryant G. Ly 2318ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2319ee018252SBryant G. Ly } 2320ee018252SBryant G. Ly 232102ccfb54SZhu Lingshan static int tcmu_send_dev_config_event(struct tcmu_dev *udev, 232202ccfb54SZhu Lingshan const char *reconfig_data) 232302ccfb54SZhu Lingshan { 232402ccfb54SZhu Lingshan struct sk_buff *skb = NULL; 232502ccfb54SZhu Lingshan void *msg_header = NULL; 232602ccfb54SZhu Lingshan int ret = 0; 232702ccfb54SZhu Lingshan 232802ccfb54SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 232902ccfb54SZhu Lingshan &skb, &msg_header); 233002ccfb54SZhu Lingshan if (ret < 0) 233102ccfb54SZhu Lingshan return ret; 233202ccfb54SZhu Lingshan ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); 233302ccfb54SZhu Lingshan if (ret < 0) { 233402ccfb54SZhu Lingshan nlmsg_free(skb); 233502ccfb54SZhu Lingshan return ret; 233602ccfb54SZhu Lingshan } 233702ccfb54SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 233806add777SMike Christie skb, msg_header); 233902ccfb54SZhu Lingshan } 234002ccfb54SZhu Lingshan 234102ccfb54SZhu Lingshan 23422d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2343ee018252SBryant G. Ly size_t count) 2344ee018252SBryant G. Ly { 2345ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2346ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2347ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 23482d76443eSMike Christie int ret, len; 2349ee018252SBryant G. Ly 23502d76443eSMike Christie len = strlen(page); 23512d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2352ee018252SBryant G. Ly return -EINVAL; 2353ee018252SBryant G. Ly 2354ee018252SBryant G. Ly /* Check if device has been configured before */ 235563d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 235602ccfb54SZhu Lingshan ret = tcmu_send_dev_config_event(udev, page); 2357ee018252SBryant G. Ly if (ret) { 2358ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2359ee018252SBryant G. Ly return ret; 2360ee018252SBryant G. Ly } 2361de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2362de8c5221SBryant G. Ly 2363de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2364de8c5221SBryant G. Ly if (ret) 2365de8c5221SBryant G. Ly return ret; 2366de8c5221SBryant G. Ly return count; 2367ee018252SBryant G. Ly } 23682d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2369ee018252SBryant G. Ly 2370ee018252SBryant G. Ly return count; 2371ee018252SBryant G. Ly } 23722d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2373ee018252SBryant G. Ly 2374801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2375801fc54dSBryant G. Ly { 2376801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2377801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2378801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2379801fc54dSBryant G. Ly 23800e0d7526SMike Christie return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); 2381801fc54dSBryant G. Ly } 2382801fc54dSBryant G. Ly 238384e28506SZhu Lingshan static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) 238484e28506SZhu Lingshan { 238584e28506SZhu Lingshan struct sk_buff *skb = NULL; 238684e28506SZhu Lingshan void *msg_header = NULL; 238784e28506SZhu Lingshan int ret = 0; 238884e28506SZhu Lingshan 238984e28506SZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 239084e28506SZhu Lingshan &skb, &msg_header); 239184e28506SZhu Lingshan if (ret < 0) 239284e28506SZhu Lingshan return ret; 239384e28506SZhu Lingshan ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, 239484e28506SZhu Lingshan size, TCMU_ATTR_PAD); 239584e28506SZhu Lingshan if (ret < 0) { 239684e28506SZhu Lingshan nlmsg_free(skb); 239784e28506SZhu Lingshan return ret; 239884e28506SZhu Lingshan } 239984e28506SZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 240006add777SMike Christie skb, msg_header); 240184e28506SZhu Lingshan } 240284e28506SZhu Lingshan 2403801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2404801fc54dSBryant G. Ly size_t count) 2405801fc54dSBryant G. Ly { 2406801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2407801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2408801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24092d76443eSMike Christie u64 val; 2410801fc54dSBryant G. Ly int ret; 2411801fc54dSBryant G. Ly 24122d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2413801fc54dSBryant G. Ly if (ret < 0) 2414801fc54dSBryant G. Ly return ret; 2415801fc54dSBryant G. Ly 2416801fc54dSBryant G. Ly /* Check if device has been configured before */ 241763d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 241884e28506SZhu Lingshan ret = tcmu_send_dev_size_event(udev, val); 2419801fc54dSBryant G. Ly if (ret) { 2420801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2421801fc54dSBryant G. Ly return ret; 2422801fc54dSBryant G. Ly } 2423801fc54dSBryant G. Ly } 24242d76443eSMike Christie udev->dev_size = val; 2425801fc54dSBryant G. Ly return count; 2426801fc54dSBryant G. Ly } 2427801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2428801fc54dSBryant G. Ly 2429b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2430b849b456SKenjiro Nakayama char *page) 2431b849b456SKenjiro Nakayama { 2432b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2433b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2434b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2435b849b456SKenjiro Nakayama 2436b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2437b849b456SKenjiro Nakayama } 2438b849b456SKenjiro Nakayama 2439b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2440b849b456SKenjiro Nakayama const char *page, size_t count) 2441b849b456SKenjiro Nakayama { 2442b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2443b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2444b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2445b849b456SKenjiro Nakayama s8 val; 2446b849b456SKenjiro Nakayama int ret; 2447b849b456SKenjiro Nakayama 2448b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2449b849b456SKenjiro Nakayama if (ret < 0) 2450b849b456SKenjiro Nakayama return ret; 2451b849b456SKenjiro Nakayama 2452b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2453b849b456SKenjiro Nakayama return count; 2454b849b456SKenjiro Nakayama } 2455b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2456b849b456SKenjiro Nakayama 24579a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 24589a8bb606SBryant G. Ly char *page) 24599a8bb606SBryant G. Ly { 24609a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24619a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24629a8bb606SBryant G. Ly 24639a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 24649a8bb606SBryant G. Ly } 24659a8bb606SBryant G. Ly 246633d065ccSZhu Lingshan static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) 246733d065ccSZhu Lingshan { 246833d065ccSZhu Lingshan struct sk_buff *skb = NULL; 246933d065ccSZhu Lingshan void *msg_header = NULL; 247033d065ccSZhu Lingshan int ret = 0; 247133d065ccSZhu Lingshan 247233d065ccSZhu Lingshan ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, 247333d065ccSZhu Lingshan &skb, &msg_header); 247433d065ccSZhu Lingshan if (ret < 0) 247533d065ccSZhu Lingshan return ret; 247633d065ccSZhu Lingshan ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); 247733d065ccSZhu Lingshan if (ret < 0) { 247833d065ccSZhu Lingshan nlmsg_free(skb); 247933d065ccSZhu Lingshan return ret; 248033d065ccSZhu Lingshan } 248133d065ccSZhu Lingshan return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, 248206add777SMike Christie skb, msg_header); 248333d065ccSZhu Lingshan } 248433d065ccSZhu Lingshan 24859a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 24869a8bb606SBryant G. Ly const char *page, size_t count) 24879a8bb606SBryant G. Ly { 24889a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 24899a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 24901068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 24912d76443eSMike Christie u8 val; 24929a8bb606SBryant G. Ly int ret; 24939a8bb606SBryant G. Ly 24942d76443eSMike Christie ret = kstrtou8(page, 0, &val); 24959a8bb606SBryant G. Ly if (ret < 0) 24969a8bb606SBryant G. Ly return ret; 24979a8bb606SBryant G. Ly 24981068be7bSBryant G. Ly /* Check if device has been configured before */ 249963d5be0fSMike Christie if (target_dev_configured(&udev->se_dev)) { 250033d065ccSZhu Lingshan ret = tcmu_send_emulate_write_cache(udev, val); 25011068be7bSBryant G. Ly if (ret) { 25021068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 25031068be7bSBryant G. Ly return ret; 25041068be7bSBryant G. Ly } 25051068be7bSBryant G. Ly } 25062d76443eSMike Christie 25072d76443eSMike Christie da->emulate_write_cache = val; 25089a8bb606SBryant G. Ly return count; 25099a8bb606SBryant G. Ly } 25109a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 25119a8bb606SBryant G. Ly 2512892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2513892782caSMike Christie { 2514892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2515892782caSMike Christie struct se_device, 2516892782caSMike Christie dev_action_group); 2517892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2518892782caSMike Christie 2519892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2520892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2521892782caSMike Christie else 2522892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2523892782caSMike Christie } 2524892782caSMike Christie 2525892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2526892782caSMike Christie size_t count) 2527892782caSMike Christie { 2528892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2529892782caSMike Christie struct se_device, 2530892782caSMike Christie dev_action_group); 2531892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2532892782caSMike Christie u8 val; 2533892782caSMike Christie int ret; 2534892782caSMike Christie 2535a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2536a30b0473SMike Christie pr_err("Device is not configured.\n"); 2537a30b0473SMike Christie return -EINVAL; 2538a30b0473SMike Christie } 2539a30b0473SMike Christie 2540892782caSMike Christie ret = kstrtou8(page, 0, &val); 2541892782caSMike Christie if (ret < 0) 2542892782caSMike Christie return ret; 2543892782caSMike Christie 2544892782caSMike Christie if (val > 1) { 2545892782caSMike Christie pr_err("Invalid block value %d\n", val); 2546892782caSMike Christie return -EINVAL; 2547892782caSMike Christie } 2548892782caSMike Christie 2549892782caSMike Christie if (!val) 2550892782caSMike Christie tcmu_unblock_dev(udev); 2551892782caSMike Christie else 2552892782caSMike Christie tcmu_block_dev(udev); 2553892782caSMike Christie return count; 2554892782caSMike Christie } 2555892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2556892782caSMike Christie 2557892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2558892782caSMike Christie size_t count) 2559892782caSMike Christie { 2560892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2561892782caSMike Christie struct se_device, 2562892782caSMike Christie dev_action_group); 2563892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2564892782caSMike Christie u8 val; 2565892782caSMike Christie int ret; 2566892782caSMike Christie 2567a30b0473SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2568a30b0473SMike Christie pr_err("Device is not configured.\n"); 2569a30b0473SMike Christie return -EINVAL; 2570a30b0473SMike Christie } 2571a30b0473SMike Christie 2572892782caSMike Christie ret = kstrtou8(page, 0, &val); 2573892782caSMike Christie if (ret < 0) 2574892782caSMike Christie return ret; 2575892782caSMike Christie 2576892782caSMike Christie if (val != 1 && val != 2) { 2577892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2578892782caSMike Christie return -EINVAL; 2579892782caSMike Christie } 2580892782caSMike Christie 2581892782caSMike Christie tcmu_reset_ring(udev, val); 2582892782caSMike Christie return count; 2583892782caSMike Christie } 2584892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2585892782caSMike Christie 25865821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2587801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 25889103575aSMike Christie &tcmu_attr_qfull_time_out, 258980eb8761SMike Christie &tcmu_attr_max_data_area_mb, 25902d76443eSMike Christie &tcmu_attr_dev_config, 2591801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2592801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 2593b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2594801fc54dSBryant G. Ly NULL, 2595801fc54dSBryant G. Ly }; 2596801fc54dSBryant G. Ly 25977d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 25987d7a7435SNicholas Bellinger 2599892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2600892782caSMike Christie &tcmu_attr_block_dev, 2601892782caSMike Christie &tcmu_attr_reset_ring, 2602892782caSMike Christie NULL, 2603892782caSMike Christie }; 2604892782caSMike Christie 26057d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 26067c9e7a6fSAndy Grover .name = "user", 26077c9e7a6fSAndy Grover .owner = THIS_MODULE, 2608a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 26097c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 26107c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 26117c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 26127c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 261392634706SMike Christie .destroy_device = tcmu_destroy_device, 26147c9e7a6fSAndy Grover .free_device = tcmu_free_device, 26157c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 26167c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 26177c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 26187c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 26197c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2620892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 26217c9e7a6fSAndy Grover }; 26227c9e7a6fSAndy Grover 262389ec9cfdSMike Christie static void find_free_blocks(void) 2624b6df4b79SXiubo Li { 2625b6df4b79SXiubo Li struct tcmu_dev *udev; 2626b6df4b79SXiubo Li loff_t off; 2627af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2628af1dd7ffSMike Christie 262980eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2630af1dd7ffSMike Christie return; 2631b6df4b79SXiubo Li 2632b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2633b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2634b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2635b6df4b79SXiubo Li 2636dc335a99SMike Christie if (!target_dev_configured(&udev->se_dev)) { 2637dc335a99SMike Christie mutex_unlock(&udev->cmdr_lock); 2638dc335a99SMike Christie continue; 2639dc335a99SMike Christie } 2640dc335a99SMike Christie 2641b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2642b6df4b79SXiubo Li tcmu_handle_completions(udev); 2643b6df4b79SXiubo Li 2644af1dd7ffSMike Christie /* Skip the udevs in idle */ 2645af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2646b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2647b6df4b79SXiubo Li continue; 2648b6df4b79SXiubo Li } 2649b6df4b79SXiubo Li 2650b6df4b79SXiubo Li end = udev->dbi_max + 1; 2651b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2652b6df4b79SXiubo Li if (block == udev->dbi_max) { 2653b6df4b79SXiubo Li /* 2654af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2655af1dd7ffSMike Christie * reclaim any blocks. 2656b6df4b79SXiubo Li */ 2657b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2658b6df4b79SXiubo Li continue; 2659b6df4b79SXiubo Li } else if (block == end) { 2660b6df4b79SXiubo Li /* The current udev will goto idle state */ 2661b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2662b6df4b79SXiubo Li udev->dbi_max = 0; 2663b6df4b79SXiubo Li } else { 2664b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2665b6df4b79SXiubo Li udev->dbi_max = block; 2666b6df4b79SXiubo Li } 2667b6df4b79SXiubo Li 2668b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2669b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2670b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2671b6df4b79SXiubo Li 2672b6df4b79SXiubo Li /* Release the block pages */ 2673bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2674b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2675af1dd7ffSMike Christie 2676af1dd7ffSMike Christie total_freed += end - start; 2677af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2678af1dd7ffSMike Christie total_freed, udev->name); 2679b6df4b79SXiubo Li } 268089ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 268189ec9cfdSMike Christie 268280eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2683af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2684b6df4b79SXiubo Li } 2685b6df4b79SXiubo Li 2686488ebe4cSMike Christie static void check_timedout_devices(void) 2687488ebe4cSMike Christie { 2688488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 2689488ebe4cSMike Christie LIST_HEAD(devs); 2690488ebe4cSMike Christie 2691488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2692488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2693488ebe4cSMike Christie 2694488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2695488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2696488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2697488ebe4cSMike Christie 26986fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2699488ebe4cSMike Christie idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 2700a94a2572SXiubo Li 2701a94a2572SXiubo Li tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); 2702a94a2572SXiubo Li tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); 2703a94a2572SXiubo Li 27046fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2705488ebe4cSMike Christie 2706488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2707488ebe4cSMike Christie } 2708488ebe4cSMike Christie 2709488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2710488ebe4cSMike Christie } 2711488ebe4cSMike Christie 27129972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 271389ec9cfdSMike Christie { 2714488ebe4cSMike Christie check_timedout_devices(); 271589ec9cfdSMike Christie find_free_blocks(); 271689ec9cfdSMike Christie } 271789ec9cfdSMike Christie 27187c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 27197c9e7a6fSAndy Grover { 2720801fc54dSBryant G. Ly int ret, i, k, len = 0; 27217c9e7a6fSAndy Grover 27227c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 27237c9e7a6fSAndy Grover 2724af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 27259972cebbSMike Christie 27267c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 27277c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 27287c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 27297c9e7a6fSAndy Grover 0, NULL); 27307c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 27317c9e7a6fSAndy Grover return -ENOMEM; 27327c9e7a6fSAndy Grover 27337c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 27347c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 27357c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 27367c9e7a6fSAndy Grover goto out_free_cache; 27377c9e7a6fSAndy Grover } 27387c9e7a6fSAndy Grover 27397c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 27407c9e7a6fSAndy Grover if (ret < 0) { 27417c9e7a6fSAndy Grover goto out_unreg_device; 27427c9e7a6fSAndy Grover } 27437c9e7a6fSAndy Grover 27447d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 27457d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 27467d7a7435SNicholas Bellinger } 2747801fc54dSBryant G. Ly for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { 2748801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 2749801fc54dSBryant G. Ly } 2750801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 27517d7a7435SNicholas Bellinger 27527d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 27537d7a7435SNicholas Bellinger if (!tcmu_attrs) { 27547d7a7435SNicholas Bellinger ret = -ENOMEM; 27557d7a7435SNicholas Bellinger goto out_unreg_genl; 27567d7a7435SNicholas Bellinger } 27577d7a7435SNicholas Bellinger 27587d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 27597d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 27607d7a7435SNicholas Bellinger } 2761801fc54dSBryant G. Ly for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { 2762801fc54dSBryant G. Ly tcmu_attrs[i] = tcmu_attrib_attrs[k]; 27639a8bb606SBryant G. Ly i++; 2764801fc54dSBryant G. Ly } 27657d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 27667d7a7435SNicholas Bellinger 27670a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 27687c9e7a6fSAndy Grover if (ret) 27697d7a7435SNicholas Bellinger goto out_attrs; 27707c9e7a6fSAndy Grover 27717c9e7a6fSAndy Grover return 0; 27727c9e7a6fSAndy Grover 27737d7a7435SNicholas Bellinger out_attrs: 27747d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27757c9e7a6fSAndy Grover out_unreg_genl: 27767c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27777c9e7a6fSAndy Grover out_unreg_device: 27787c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27797c9e7a6fSAndy Grover out_free_cache: 27807c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27817c9e7a6fSAndy Grover 27827c9e7a6fSAndy Grover return ret; 27837c9e7a6fSAndy Grover } 27847c9e7a6fSAndy Grover 27857c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 27867c9e7a6fSAndy Grover { 2787af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 27880a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 27897d7a7435SNicholas Bellinger kfree(tcmu_attrs); 27907c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 27917c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 27927c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 27937c9e7a6fSAndy Grover } 27947c9e7a6fSAndy Grover 27957c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 27967c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 27977c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 27987c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 27997c9e7a6fSAndy Grover 28007c9e7a6fSAndy Grover module_init(tcmu_module_init); 28017c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 2802