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> 35b6df4b79SXiubo Li #include <linux/kthread.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 457c9e7a6fSAndy Grover /* 467c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 477c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 487c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 497c9e7a6fSAndy Grover * 507c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 517c9e7a6fSAndy Grover * introspection work for us. 527c9e7a6fSAndy Grover * 537c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 547c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 557c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 567c9e7a6fSAndy Grover * internal to the mmap()ed area. There is separate space outside the 577c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 587c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 597c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 607c9e7a6fSAndy Grover * 617c9e7a6fSAndy Grover * SECURITY: 627c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 637c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 647c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 657c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 667c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 677c9e7a6fSAndy Grover * this may have a 'UAM' comment. 687c9e7a6fSAndy Grover */ 697c9e7a6fSAndy Grover 707c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 717c9e7a6fSAndy Grover 72b6df4b79SXiubo Li /* For cmd area, the size is fixed 8MB */ 73b6df4b79SXiubo Li #define CMDR_SIZE (8 * 1024 * 1024) 7426418649SSheng Yang 75b6df4b79SXiubo Li /* 76b6df4b79SXiubo Li * For data area, the block size is PAGE_SIZE and 77b6df4b79SXiubo Li * the total size is 256K * PAGE_SIZE. 78b6df4b79SXiubo Li */ 79b6df4b79SXiubo Li #define DATA_BLOCK_SIZE PAGE_SIZE 80b6df4b79SXiubo Li #define DATA_BLOCK_BITS (256 * 1024) 8126418649SSheng Yang #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) 82b6df4b79SXiubo Li #define DATA_BLOCK_INIT_BITS 128 837c9e7a6fSAndy Grover 84b6df4b79SXiubo Li /* The total size of the ring is 8M + 256K * PAGE_SIZE */ 857c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 867c9e7a6fSAndy Grover 87b6df4b79SXiubo Li /* Default maximum of the global data blocks(512K * PAGE_SIZE) */ 88b6df4b79SXiubo Li #define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024) 89b6df4b79SXiubo Li 907c9e7a6fSAndy Grover static struct device *tcmu_root_device; 917c9e7a6fSAndy Grover 927c9e7a6fSAndy Grover struct tcmu_hba { 937c9e7a6fSAndy Grover u32 host_id; 947c9e7a6fSAndy Grover }; 957c9e7a6fSAndy Grover 967c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 977c9e7a6fSAndy Grover 987c9e7a6fSAndy Grover struct tcmu_dev { 99b6df4b79SXiubo Li struct list_head node; 100f3cdbe39SMike Christie struct kref kref; 1017c9e7a6fSAndy Grover struct se_device se_dev; 1027c9e7a6fSAndy Grover 1037c9e7a6fSAndy Grover char *name; 1047c9e7a6fSAndy Grover struct se_hba *hba; 1057c9e7a6fSAndy Grover 1067c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1077c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 1087c9e7a6fSAndy Grover unsigned long flags; 1097c9e7a6fSAndy Grover 1107c9e7a6fSAndy Grover struct uio_info uio_info; 1117c9e7a6fSAndy Grover 112b6df4b79SXiubo Li struct inode *inode; 113b6df4b79SXiubo Li 1147c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1157c9e7a6fSAndy Grover size_t dev_size; 1167c9e7a6fSAndy Grover u32 cmdr_size; 1177c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1183d9b9555SAndy Grover /* Offset of data area from start of mb */ 11926418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1207c9e7a6fSAndy Grover size_t data_off; 1217c9e7a6fSAndy Grover size_t data_size; 12226418649SSheng Yang 1237c9e7a6fSAndy Grover wait_queue_head_t wait_cmdr; 124b6df4b79SXiubo Li struct mutex cmdr_lock; 1257c9e7a6fSAndy Grover 126b6df4b79SXiubo Li bool waiting_global; 127141685a3SXiubo Li uint32_t dbi_max; 128b6df4b79SXiubo Li uint32_t dbi_thresh; 129141685a3SXiubo Li DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); 130141685a3SXiubo Li struct radix_tree_root data_blocks; 131141685a3SXiubo Li 1327c9e7a6fSAndy Grover struct idr commands; 1337c9e7a6fSAndy Grover spinlock_t commands_lock; 1347c9e7a6fSAndy Grover 1357c9e7a6fSAndy Grover struct timer_list timeout; 136af980e46SMike Christie unsigned int cmd_time_out; 1377c9e7a6fSAndy Grover 1387c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 1397c9e7a6fSAndy Grover }; 1407c9e7a6fSAndy Grover 1417c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1427c9e7a6fSAndy Grover 1437c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1447c9e7a6fSAndy Grover 1457c9e7a6fSAndy Grover struct tcmu_cmd { 1467c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1477c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 1487c9e7a6fSAndy Grover 1497c9e7a6fSAndy Grover uint16_t cmd_id; 1507c9e7a6fSAndy Grover 15126418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1527c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 153141685a3SXiubo Li uint32_t dbi_cnt; 154141685a3SXiubo Li uint32_t dbi_cur; 155141685a3SXiubo Li uint32_t *dbi; 1567c9e7a6fSAndy Grover 1577c9e7a6fSAndy Grover unsigned long deadline; 1587c9e7a6fSAndy Grover 1597c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1607c9e7a6fSAndy Grover unsigned long flags; 1617c9e7a6fSAndy Grover }; 1627c9e7a6fSAndy Grover 163b6df4b79SXiubo Li static struct task_struct *unmap_thread; 164b6df4b79SXiubo Li static wait_queue_head_t unmap_wait; 165b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 166b6df4b79SXiubo Li static LIST_HEAD(root_udev); 167b6df4b79SXiubo Li 168b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 169b6df4b79SXiubo Li 1707c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 1717c9e7a6fSAndy Grover 1727c9e7a6fSAndy Grover /* multicast group */ 1737c9e7a6fSAndy Grover enum tcmu_multicast_groups { 1747c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 1757c9e7a6fSAndy Grover }; 1767c9e7a6fSAndy Grover 1777c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 1787c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 1797c9e7a6fSAndy Grover }; 1807c9e7a6fSAndy Grover 1817c9e7a6fSAndy Grover /* Our generic netlink family */ 18256989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 183489111e5SJohannes Berg .module = THIS_MODULE, 1847c9e7a6fSAndy Grover .hdrsize = 0, 1857c9e7a6fSAndy Grover .name = "TCM-USER", 1867c9e7a6fSAndy Grover .version = 1, 1877c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 1887c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 1897c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 19020c08b36SSheng Yang .netnsok = true, 1917c9e7a6fSAndy Grover }; 1927c9e7a6fSAndy Grover 193141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 194141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 195141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 196141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 197141685a3SXiubo Li 198b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 199141685a3SXiubo Li { 200141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 201141685a3SXiubo Li uint32_t i; 202141685a3SXiubo Li 203b6df4b79SXiubo Li for (i = 0; i < len; i++) 204141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 205141685a3SXiubo Li } 206141685a3SXiubo Li 207b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 208b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 209141685a3SXiubo Li { 210b6df4b79SXiubo Li struct page *page; 211b6df4b79SXiubo Li int ret, dbi; 212141685a3SXiubo Li 213b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 214b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 215b6df4b79SXiubo Li return false; 216b6df4b79SXiubo Li 217b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 218b6df4b79SXiubo Li if (!page) { 219b6df4b79SXiubo Li 220b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 221b6df4b79SXiubo Li TCMU_GLOBAL_MAX_BLOCKS) { 222b6df4b79SXiubo Li atomic_dec(&global_db_count); 223b6df4b79SXiubo Li return false; 224b6df4b79SXiubo Li } 225b6df4b79SXiubo Li 226b6df4b79SXiubo Li /* try to get new page from the mm */ 227b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL); 228b6df4b79SXiubo Li if (!page) 229b6df4b79SXiubo Li return false; 230b6df4b79SXiubo Li 231b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 232b6df4b79SXiubo Li if (ret) { 233b6df4b79SXiubo Li __free_page(page); 234b6df4b79SXiubo Li return false; 235b6df4b79SXiubo Li } 236b6df4b79SXiubo Li 237b6df4b79SXiubo Li } 238b6df4b79SXiubo Li 239141685a3SXiubo Li if (dbi > udev->dbi_max) 240141685a3SXiubo Li udev->dbi_max = dbi; 241141685a3SXiubo Li 242141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 243b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 244141685a3SXiubo Li 245b6df4b79SXiubo Li return true; 246141685a3SXiubo Li } 247141685a3SXiubo Li 248b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 249b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 250b6df4b79SXiubo Li { 251b6df4b79SXiubo Li int i; 252b6df4b79SXiubo Li 253b6df4b79SXiubo Li udev->waiting_global = false; 254b6df4b79SXiubo Li 255b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 256b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 257b6df4b79SXiubo Li goto err; 258141685a3SXiubo Li } 259b6df4b79SXiubo Li return true; 260b6df4b79SXiubo Li 261b6df4b79SXiubo Li err: 262b6df4b79SXiubo Li udev->waiting_global = true; 263b6df4b79SXiubo Li /* Try to wake up the unmap thread */ 264b6df4b79SXiubo Li wake_up(&unmap_wait); 265b6df4b79SXiubo Li return false; 266141685a3SXiubo Li } 267141685a3SXiubo Li 268b6df4b79SXiubo Li static inline struct page * 269b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 270141685a3SXiubo Li { 271141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 272141685a3SXiubo Li } 273141685a3SXiubo Li 274141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 275141685a3SXiubo Li { 276141685a3SXiubo Li kfree(tcmu_cmd->dbi); 277141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 278141685a3SXiubo Li } 279141685a3SXiubo Li 280141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 281141685a3SXiubo Li { 282141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 283141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 284141685a3SXiubo Li 285141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 286141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 287141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 288141685a3SXiubo Li DATA_BLOCK_SIZE); 289141685a3SXiubo Li } 290141685a3SXiubo Li 291141685a3SXiubo Li return data_length; 292141685a3SXiubo Li } 293141685a3SXiubo Li 294141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 295141685a3SXiubo Li { 296141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 297141685a3SXiubo Li 298141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 299141685a3SXiubo Li } 300141685a3SXiubo Li 3017c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 3027c9e7a6fSAndy Grover { 3037c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 3047c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 3057c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 3067c9e7a6fSAndy Grover int cmd_id; 3077c9e7a6fSAndy Grover 3087c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 3097c9e7a6fSAndy Grover if (!tcmu_cmd) 3107c9e7a6fSAndy Grover return NULL; 3117c9e7a6fSAndy Grover 3127c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 3137c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 314af980e46SMike Christie if (udev->cmd_time_out) 315af980e46SMike Christie tcmu_cmd->deadline = jiffies + 316af980e46SMike Christie msecs_to_jiffies(udev->cmd_time_out); 3177c9e7a6fSAndy Grover 318141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 319141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 320141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 321141685a3SXiubo Li GFP_KERNEL); 322141685a3SXiubo Li if (!tcmu_cmd->dbi) { 323141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 324141685a3SXiubo Li return NULL; 325141685a3SXiubo Li } 326141685a3SXiubo Li 3277c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 3287c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 3297c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 3307c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 3317c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 3327c9e7a6fSAndy Grover idr_preload_end(); 3337c9e7a6fSAndy Grover 3347c9e7a6fSAndy Grover if (cmd_id < 0) { 335141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 3367c9e7a6fSAndy Grover return NULL; 3377c9e7a6fSAndy Grover } 3387c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 3397c9e7a6fSAndy Grover 3407c9e7a6fSAndy Grover return tcmu_cmd; 3417c9e7a6fSAndy Grover } 3427c9e7a6fSAndy Grover 3437c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 3447c9e7a6fSAndy Grover { 345b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 3467c9e7a6fSAndy Grover 3477c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 3487c9e7a6fSAndy Grover vaddr -= offset; 3497c9e7a6fSAndy Grover 3507c9e7a6fSAndy Grover while (size) { 3517c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 3527c9e7a6fSAndy Grover size -= PAGE_SIZE; 3537c9e7a6fSAndy Grover } 3547c9e7a6fSAndy Grover } 3557c9e7a6fSAndy Grover 3567c9e7a6fSAndy Grover /* 3577c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 3587c9e7a6fSAndy Grover * we can't use circ_buf.h. 3597c9e7a6fSAndy Grover */ 3607c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 3617c9e7a6fSAndy Grover { 3627c9e7a6fSAndy Grover int diff = head - tail; 3637c9e7a6fSAndy Grover 3647c9e7a6fSAndy Grover if (diff >= 0) 3657c9e7a6fSAndy Grover return diff; 3667c9e7a6fSAndy Grover else 3677c9e7a6fSAndy Grover return size + diff; 3687c9e7a6fSAndy Grover } 3697c9e7a6fSAndy Grover 3707c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 3717c9e7a6fSAndy Grover { 3727c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 3737c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 3747c9e7a6fSAndy Grover } 3757c9e7a6fSAndy Grover 3767c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 3777c9e7a6fSAndy Grover { 3787c9e7a6fSAndy Grover return size - head; 3797c9e7a6fSAndy Grover } 3807c9e7a6fSAndy Grover 381f1dbd087SSheng Yang static inline void new_iov(struct iovec **iov, int *iov_cnt, 382f1dbd087SSheng Yang struct tcmu_dev *udev) 383f1dbd087SSheng Yang { 384f1dbd087SSheng Yang struct iovec *iovec; 385f1dbd087SSheng Yang 386f1dbd087SSheng Yang if (*iov_cnt != 0) 387f1dbd087SSheng Yang (*iov)++; 388f1dbd087SSheng Yang (*iov_cnt)++; 389f1dbd087SSheng Yang 390f1dbd087SSheng Yang iovec = *iov; 391f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 392f1dbd087SSheng Yang } 393f1dbd087SSheng Yang 3947c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 3957c9e7a6fSAndy Grover 39626418649SSheng Yang /* offset is relative to mb_addr */ 397141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 398141685a3SXiubo Li int dbi, int remaining) 39926418649SSheng Yang { 400141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 40126418649SSheng Yang DATA_BLOCK_SIZE - remaining; 40226418649SSheng Yang } 40326418649SSheng Yang 40426418649SSheng Yang static inline size_t iov_tail(struct tcmu_dev *udev, struct iovec *iov) 40526418649SSheng Yang { 40626418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 40726418649SSheng Yang } 40826418649SSheng Yang 409b6df4b79SXiubo Li static int scatter_data_area(struct tcmu_dev *udev, 410141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 411141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 412141685a3SXiubo Li int *iov_cnt, bool copy_data) 413f97ec7dbSIlias Tsitsimpis { 414141685a3SXiubo Li int i, dbi; 41526418649SSheng Yang int block_remaining = 0; 416141685a3SXiubo Li void *from, *to = NULL; 417141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 418f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 419b6df4b79SXiubo Li struct page *page; 420f97ec7dbSIlias Tsitsimpis 421f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 42226418649SSheng Yang int sg_remaining = sg->length; 423f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 42426418649SSheng Yang while (sg_remaining > 0) { 42526418649SSheng Yang if (block_remaining == 0) { 426b6df4b79SXiubo Li if (to) 427b6df4b79SXiubo Li kunmap_atomic(to); 428b6df4b79SXiubo Li 42926418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 430b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 431b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 432b6df4b79SXiubo Li to = kmap_atomic(page); 433141685a3SXiubo Li } 434141685a3SXiubo Li 43526418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 43626418649SSheng Yang block_remaining); 437141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 43826418649SSheng Yang block_remaining); 439141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 440141685a3SXiubo Li to = (void *)(unsigned long)to + offset; 441141685a3SXiubo Li 44226418649SSheng Yang if (*iov_cnt != 0 && 44326418649SSheng Yang to_offset == iov_tail(udev, *iov)) { 444f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 44526418649SSheng Yang } else { 446f1dbd087SSheng Yang new_iov(iov, iov_cnt, udev); 44726418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 448f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 44926418649SSheng Yang } 450f97ec7dbSIlias Tsitsimpis if (copy_data) { 45126418649SSheng Yang memcpy(to, from + sg->length - sg_remaining, 45226418649SSheng Yang copy_bytes); 453f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 454f97ec7dbSIlias Tsitsimpis } 45526418649SSheng Yang sg_remaining -= copy_bytes; 45626418649SSheng Yang block_remaining -= copy_bytes; 457f97ec7dbSIlias Tsitsimpis } 458e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 459f97ec7dbSIlias Tsitsimpis } 460b6df4b79SXiubo Li if (to) 461b6df4b79SXiubo Li kunmap_atomic(to); 462f97ec7dbSIlias Tsitsimpis 463141685a3SXiubo Li return 0; 4640c28481fSSheng Yang } 4650c28481fSSheng Yang 466a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 467a5d68ba8SXiubo Li bool bidi) 468f97ec7dbSIlias Tsitsimpis { 469a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 470141685a3SXiubo Li int i, dbi; 47126418649SSheng Yang int block_remaining = 0; 472b6df4b79SXiubo Li void *from = NULL, *to; 473141685a3SXiubo Li size_t copy_bytes, offset; 474a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 475b6df4b79SXiubo Li struct page *page; 476a5d68ba8SXiubo Li unsigned int data_nents; 477141685a3SXiubo Li uint32_t count = 0; 478a5d68ba8SXiubo Li 479a5d68ba8SXiubo Li if (!bidi) { 480a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 481a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 482a5d68ba8SXiubo Li } else { 483a5d68ba8SXiubo Li 484a5d68ba8SXiubo Li /* 485a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 486a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 487a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 488a5d68ba8SXiubo Li */ 489a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 490a5d68ba8SXiubo Li 491a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 492a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 493a5d68ba8SXiubo Li } 494f97ec7dbSIlias Tsitsimpis 495141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 496141685a3SXiubo Li 497f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 49826418649SSheng Yang int sg_remaining = sg->length; 499f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 50026418649SSheng Yang while (sg_remaining > 0) { 50126418649SSheng Yang if (block_remaining == 0) { 502b6df4b79SXiubo Li if (from) 503b6df4b79SXiubo Li kunmap_atomic(from); 504b6df4b79SXiubo Li 50526418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 506141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 507b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 508b6df4b79SXiubo Li from = kmap_atomic(page); 50926418649SSheng Yang } 51026418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 51126418649SSheng Yang block_remaining); 512141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 513141685a3SXiubo Li from = (void *)(unsigned long)from + offset; 514f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 51526418649SSheng Yang memcpy(to + sg->length - sg_remaining, from, 51626418649SSheng Yang copy_bytes); 517f97ec7dbSIlias Tsitsimpis 51826418649SSheng Yang sg_remaining -= copy_bytes; 51926418649SSheng Yang block_remaining -= copy_bytes; 520f97ec7dbSIlias Tsitsimpis } 521e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 522f97ec7dbSIlias Tsitsimpis } 523b6df4b79SXiubo Li if (from) 524b6df4b79SXiubo Li kunmap_atomic(from); 525f97ec7dbSIlias Tsitsimpis } 526f97ec7dbSIlias Tsitsimpis 527b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 52826418649SSheng Yang { 529b6df4b79SXiubo Li return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); 53026418649SSheng Yang } 53126418649SSheng Yang 5327c9e7a6fSAndy Grover /* 533f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 5343d9b9555SAndy Grover * space available on the data area. 5357c9e7a6fSAndy Grover * 5367c9e7a6fSAndy Grover * Called with ring lock held. 5377c9e7a6fSAndy Grover */ 538b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 539b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 5407c9e7a6fSAndy Grover { 5417c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 542b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 543b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 5440241fd39SNicholas Bellinger size_t space, cmd_needed; 5457c9e7a6fSAndy Grover u32 cmd_head; 5467c9e7a6fSAndy Grover 5477c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5487c9e7a6fSAndy Grover 5497c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 5507c9e7a6fSAndy Grover 551f56574a2SAndy Grover /* 552f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 553f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 554f56574a2SAndy Grover */ 555f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 556f56574a2SAndy Grover cmd_needed = cmd_size; 557f56574a2SAndy Grover else 558f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 559f56574a2SAndy Grover 5607c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 5617c9e7a6fSAndy Grover if (space < cmd_needed) { 5627c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 5637c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 5647c9e7a6fSAndy Grover return false; 5657c9e7a6fSAndy Grover } 5667c9e7a6fSAndy Grover 567b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 568b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 5697c9e7a6fSAndy Grover if (space < data_needed) { 570b6df4b79SXiubo Li unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; 571b6df4b79SXiubo Li unsigned long grow; 572b6df4b79SXiubo Li 573b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 574b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 575b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 576b6df4b79SXiubo Li data_needed); 5777c9e7a6fSAndy Grover return false; 5787c9e7a6fSAndy Grover } 5797c9e7a6fSAndy Grover 580b6df4b79SXiubo Li /* Try to expand the thresh */ 581b6df4b79SXiubo Li if (!udev->dbi_thresh) { 582b6df4b79SXiubo Li /* From idle state */ 583b6df4b79SXiubo Li uint32_t init_thresh = DATA_BLOCK_INIT_BITS; 584b6df4b79SXiubo Li 585b6df4b79SXiubo Li udev->dbi_thresh = max(blocks_needed, init_thresh); 586b6df4b79SXiubo Li } else { 587b6df4b79SXiubo Li /* 588b6df4b79SXiubo Li * Grow the data area by max(blocks needed, 589b6df4b79SXiubo Li * dbi_thresh / 2), but limited to the max 590b6df4b79SXiubo Li * DATA_BLOCK_BITS size. 591b6df4b79SXiubo Li */ 592b6df4b79SXiubo Li grow = max(blocks_needed, udev->dbi_thresh / 2); 593b6df4b79SXiubo Li udev->dbi_thresh += grow; 594b6df4b79SXiubo Li if (udev->dbi_thresh > DATA_BLOCK_BITS) 595b6df4b79SXiubo Li udev->dbi_thresh = DATA_BLOCK_BITS; 596b6df4b79SXiubo Li } 597b6df4b79SXiubo Li } 598b6df4b79SXiubo Li 599b6df4b79SXiubo Li if (!tcmu_get_empty_blocks(udev, cmd)) 600b6df4b79SXiubo Li return false; 601b6df4b79SXiubo Li 6027c9e7a6fSAndy Grover return true; 6037c9e7a6fSAndy Grover } 6047c9e7a6fSAndy Grover 605fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 606fe25cc34SXiubo Li { 607fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 608fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 609fe25cc34SXiubo Li } 610fe25cc34SXiubo Li 611fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 612fe25cc34SXiubo Li size_t base_command_size) 613fe25cc34SXiubo Li { 614fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 615fe25cc34SXiubo Li size_t command_size; 616fe25cc34SXiubo Li 617fe25cc34SXiubo Li command_size = base_command_size + 618fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 619fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 620fe25cc34SXiubo Li 621fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 622fe25cc34SXiubo Li 623fe25cc34SXiubo Li return command_size; 624fe25cc34SXiubo Li } 625fe25cc34SXiubo Li 62602eb924fSAndy Grover static sense_reason_t 62702eb924fSAndy Grover tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 6287c9e7a6fSAndy Grover { 6297c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 6307c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 6317c9e7a6fSAndy Grover size_t base_command_size, command_size; 6327c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 6337c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 6347c9e7a6fSAndy Grover struct iovec *iov; 635141685a3SXiubo Li int iov_cnt, ret; 6367c9e7a6fSAndy Grover uint32_t cmd_head; 6377c9e7a6fSAndy Grover uint64_t cdb_off; 638f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 639ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 6407c9e7a6fSAndy Grover 6417c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 64202eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 6437c9e7a6fSAndy Grover 6447c9e7a6fSAndy Grover /* 6457c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 6467c9e7a6fSAndy Grover * also may be larger if the iov array is large. 6477c9e7a6fSAndy Grover * 648fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 649fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 650fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 651fe25cc34SXiubo Li * will only be used to do the checks. 652fe25cc34SXiubo Li * 653fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 654fe25cc34SXiubo Li * cmd area memories. 6557c9e7a6fSAndy Grover */ 656fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 657fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 6587c9e7a6fSAndy Grover 659b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 6607c9e7a6fSAndy Grover 6617c9e7a6fSAndy Grover mb = udev->mb_addr; 6627c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 663554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 664554617b2SAndy Grover data_length > udev->data_size) { 665554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 6663d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 6677c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 668b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 669554617b2SAndy Grover return TCM_INVALID_CDB_FIELD; 670554617b2SAndy Grover } 6717c9e7a6fSAndy Grover 672b6df4b79SXiubo Li while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 6737c9e7a6fSAndy Grover int ret; 6747c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 6757c9e7a6fSAndy Grover 6767c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 6777c9e7a6fSAndy Grover 6787c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 679b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 680af980e46SMike Christie if (udev->cmd_time_out) 681af980e46SMike Christie ret = schedule_timeout( 682af980e46SMike Christie msecs_to_jiffies(udev->cmd_time_out)); 683af980e46SMike Christie else 6847c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 6857c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 6867c9e7a6fSAndy Grover if (!ret) { 6877c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 68802eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 6897c9e7a6fSAndy Grover } 6907c9e7a6fSAndy Grover 691b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 6927c9e7a6fSAndy Grover 6937c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 6947c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 6957c9e7a6fSAndy Grover } 6967c9e7a6fSAndy Grover 697f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 698f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 699f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 700f56574a2SAndy Grover 7017c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 7027c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 7030ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 7040ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 7050ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 7060ad46af8SAndy Grover entry->hdr.kflags = 0; 7070ad46af8SAndy Grover entry->hdr.uflags = 0; 7087c9e7a6fSAndy Grover 7097c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 7107c9e7a6fSAndy Grover 7117c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 7127c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 7137c9e7a6fSAndy Grover } 7147c9e7a6fSAndy Grover 7157c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 7167c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 7170ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 7180ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 7190ad46af8SAndy Grover entry->hdr.kflags = 0; 7200ad46af8SAndy Grover entry->hdr.uflags = 0; 7217c9e7a6fSAndy Grover 7223d9b9555SAndy Grover /* Handle allocating space from the data area */ 723b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 7247c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 725f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 726e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 727e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 728b6df4b79SXiubo Li ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 729b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 730b6df4b79SXiubo Li copy_to_data_area); 731141685a3SXiubo Li if (ret) { 732b6df4b79SXiubo Li tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 733b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 734b6df4b79SXiubo Li 735141685a3SXiubo Li pr_err("tcmu: alloc and scatter data failed\n"); 736141685a3SXiubo Li return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 737141685a3SXiubo Li } 7387c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 7390ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 7407c9e7a6fSAndy Grover 741e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 742ab22d260SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 743e4648b01SIlias Tsitsimpis iov_cnt = 0; 744ab22d260SXiubo Li iov++; 745b6df4b79SXiubo Li ret = scatter_data_area(udev, tcmu_cmd, 746141685a3SXiubo Li se_cmd->t_bidi_data_sg, 747141685a3SXiubo Li se_cmd->t_bidi_data_nents, 748141685a3SXiubo Li &iov, &iov_cnt, false); 749141685a3SXiubo Li if (ret) { 750b6df4b79SXiubo Li tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 751b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 752b6df4b79SXiubo Li 753141685a3SXiubo Li pr_err("tcmu: alloc and scatter bidi data failed\n"); 754141685a3SXiubo Li return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 755141685a3SXiubo Li } 756e4648b01SIlias Tsitsimpis entry->req.iov_bidi_cnt = iov_cnt; 757ab22d260SXiubo Li } 75826418649SSheng Yang 759fe25cc34SXiubo Li /* 760fe25cc34SXiubo Li * Recalaulate the command's base size and size according 761fe25cc34SXiubo Li * to the actual needs 762fe25cc34SXiubo Li */ 763fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 764fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 765fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 766fe25cc34SXiubo Li 767fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 768fe25cc34SXiubo Li 7697c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 7707c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 7717c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 7727c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 7737c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 7747c9e7a6fSAndy Grover 7757c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 7767c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 777b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 7787c9e7a6fSAndy Grover 7797c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 7807c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 7817c9e7a6fSAndy Grover 782af980e46SMike Christie if (udev->cmd_time_out) 783af980e46SMike Christie mod_timer(&udev->timeout, round_jiffies_up(jiffies + 784af980e46SMike Christie msecs_to_jiffies(udev->cmd_time_out))); 7857c9e7a6fSAndy Grover 78602eb924fSAndy Grover return TCM_NO_SENSE; 7877c9e7a6fSAndy Grover } 7887c9e7a6fSAndy Grover 78902eb924fSAndy Grover static sense_reason_t 79002eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 7917c9e7a6fSAndy Grover { 7927c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 7937c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 7947c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 795ecaf597bSBart Van Assche sense_reason_t ret; 7967c9e7a6fSAndy Grover 7977c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 7987c9e7a6fSAndy Grover if (!tcmu_cmd) 79902eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 8007c9e7a6fSAndy Grover 8017c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 80202eb924fSAndy Grover if (ret != TCM_NO_SENSE) { 8037c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 8047c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 8057c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 8067c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 8077c9e7a6fSAndy Grover 808141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 8097c9e7a6fSAndy Grover } 8107c9e7a6fSAndy Grover 8117c9e7a6fSAndy Grover return ret; 8127c9e7a6fSAndy Grover } 8137c9e7a6fSAndy Grover 8147c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 8157c9e7a6fSAndy Grover { 8167c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 8177c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 8187c9e7a6fSAndy Grover 819b25c7863SSheng Yang /* 820b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 8213d9b9555SAndy Grover * data area space and free cmd 822b25c7863SSheng Yang */ 823141685a3SXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 824141685a3SXiubo Li goto out; 825b25c7863SSheng Yang 826141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 8277c9e7a6fSAndy Grover 8280ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 8290ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 8300ad46af8SAndy Grover cmd->se_cmd); 831ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 832ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 8337c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 8347c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 835e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 83626418649SSheng Yang /* Get Data-In buffer before clean up */ 837a5d68ba8SXiubo Li gather_data_area(udev, cmd, true); 838e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 839a5d68ba8SXiubo Li gather_data_area(udev, cmd, false); 8407c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 841141685a3SXiubo Li /* TODO: */ 8422bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 8432bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 8442bc396a2SIlias Tsitsimpis se_cmd->data_direction); 8457c9e7a6fSAndy Grover } 8467c9e7a6fSAndy Grover 8477c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 8487c9e7a6fSAndy Grover 849141685a3SXiubo Li out: 850141685a3SXiubo Li cmd->se_cmd = NULL; 851b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 852141685a3SXiubo Li tcmu_free_cmd(cmd); 8537c9e7a6fSAndy Grover } 8547c9e7a6fSAndy Grover 8557c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 8567c9e7a6fSAndy Grover { 8577c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8587c9e7a6fSAndy Grover int handled = 0; 8597c9e7a6fSAndy Grover 8607c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 8617c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 8627c9e7a6fSAndy Grover return 0; 8637c9e7a6fSAndy Grover } 8647c9e7a6fSAndy Grover 8657c9e7a6fSAndy Grover mb = udev->mb_addr; 8667c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 8677c9e7a6fSAndy Grover 8687c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 8697c9e7a6fSAndy Grover 8707c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 8717c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 8727c9e7a6fSAndy Grover 8737c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 8747c9e7a6fSAndy Grover 8750ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 8760ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 8770ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 8780ad46af8SAndy Grover udev->cmdr_size); 8797c9e7a6fSAndy Grover continue; 8807c9e7a6fSAndy Grover } 8810ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 8827c9e7a6fSAndy Grover 8837c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 884d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 8857c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 8867c9e7a6fSAndy Grover 8877c9e7a6fSAndy Grover if (!cmd) { 8887c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 8897c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 8907c9e7a6fSAndy Grover break; 8917c9e7a6fSAndy Grover } 8927c9e7a6fSAndy Grover 8937c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 8947c9e7a6fSAndy Grover 8950ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 8960ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 8970ad46af8SAndy Grover udev->cmdr_size); 8987c9e7a6fSAndy Grover 8997c9e7a6fSAndy Grover handled++; 9007c9e7a6fSAndy Grover } 9017c9e7a6fSAndy Grover 9027c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 9037c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 9047c9e7a6fSAndy Grover 9057c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 9067c9e7a6fSAndy Grover 9077c9e7a6fSAndy Grover return handled; 9087c9e7a6fSAndy Grover } 9097c9e7a6fSAndy Grover 9107c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 9117c9e7a6fSAndy Grover { 9127c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 9137c9e7a6fSAndy Grover 9147c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 9157c9e7a6fSAndy Grover return 0; 9167c9e7a6fSAndy Grover 917611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 9187c9e7a6fSAndy Grover return 0; 9197c9e7a6fSAndy Grover 9207c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 9217c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 9227c9e7a6fSAndy Grover cmd->se_cmd = NULL; 9237c9e7a6fSAndy Grover 9247c9e7a6fSAndy Grover return 0; 9257c9e7a6fSAndy Grover } 9267c9e7a6fSAndy Grover 9277c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 9287c9e7a6fSAndy Grover { 9297c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 9307c9e7a6fSAndy Grover unsigned long flags; 9317c9e7a6fSAndy Grover 9327c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 9337c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 9347c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 9357c9e7a6fSAndy Grover 936b6df4b79SXiubo Li /* Try to wake up the ummap thread */ 937b6df4b79SXiubo Li wake_up(&unmap_wait); 938b6df4b79SXiubo Li 9397c9e7a6fSAndy Grover /* 9407c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 9417c9e7a6fSAndy Grover * own timeout. 9427c9e7a6fSAndy Grover */ 9437c9e7a6fSAndy Grover } 9447c9e7a6fSAndy Grover 9457c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 9467c9e7a6fSAndy Grover { 9477c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 9487c9e7a6fSAndy Grover 9497c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 9507c9e7a6fSAndy Grover if (!tcmu_hba) 9517c9e7a6fSAndy Grover return -ENOMEM; 9527c9e7a6fSAndy Grover 9537c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 9547c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 9557c9e7a6fSAndy Grover 9567c9e7a6fSAndy Grover return 0; 9577c9e7a6fSAndy Grover } 9587c9e7a6fSAndy Grover 9597c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 9607c9e7a6fSAndy Grover { 9617c9e7a6fSAndy Grover kfree(hba->hba_ptr); 9627c9e7a6fSAndy Grover hba->hba_ptr = NULL; 9637c9e7a6fSAndy Grover } 9647c9e7a6fSAndy Grover 9657c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 9667c9e7a6fSAndy Grover { 9677c9e7a6fSAndy Grover struct tcmu_dev *udev; 9687c9e7a6fSAndy Grover 9697c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 9707c9e7a6fSAndy Grover if (!udev) 9717c9e7a6fSAndy Grover return NULL; 972f3cdbe39SMike Christie kref_init(&udev->kref); 9737c9e7a6fSAndy Grover 9747c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 9757c9e7a6fSAndy Grover if (!udev->name) { 9767c9e7a6fSAndy Grover kfree(udev); 9777c9e7a6fSAndy Grover return NULL; 9787c9e7a6fSAndy Grover } 9797c9e7a6fSAndy Grover 9807c9e7a6fSAndy Grover udev->hba = hba; 981af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 9827c9e7a6fSAndy Grover 9837c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 984b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 9857c9e7a6fSAndy Grover 9867c9e7a6fSAndy Grover idr_init(&udev->commands); 9877c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 9887c9e7a6fSAndy Grover 9897c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 9907c9e7a6fSAndy Grover (unsigned long)udev); 9917c9e7a6fSAndy Grover 9927c9e7a6fSAndy Grover return &udev->se_dev; 9937c9e7a6fSAndy Grover } 9947c9e7a6fSAndy Grover 9957c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 9967c9e7a6fSAndy Grover { 9977c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 9987c9e7a6fSAndy Grover 999b6df4b79SXiubo Li mutex_lock(&tcmu_dev->cmdr_lock); 10007c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 1001b6df4b79SXiubo Li mutex_unlock(&tcmu_dev->cmdr_lock); 10027c9e7a6fSAndy Grover 10037c9e7a6fSAndy Grover return 0; 10047c9e7a6fSAndy Grover } 10057c9e7a6fSAndy Grover 10067c9e7a6fSAndy Grover /* 10077c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 10087c9e7a6fSAndy Grover * and this stuff must come along. 10097c9e7a6fSAndy Grover */ 10107c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 10117c9e7a6fSAndy Grover { 10127c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 10137c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 10147c9e7a6fSAndy Grover 10157c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 10167c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 10177c9e7a6fSAndy Grover return -1; 10187c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 10197c9e7a6fSAndy Grover } 10207c9e7a6fSAndy Grover return -1; 10217c9e7a6fSAndy Grover } 10227c9e7a6fSAndy Grover 1023b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1024b6df4b79SXiubo Li { 1025b6df4b79SXiubo Li struct page *page; 1026b6df4b79SXiubo Li int ret; 1027b6df4b79SXiubo Li 1028b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1029b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1030b6df4b79SXiubo Li if (likely(page)) { 1031b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1032b6df4b79SXiubo Li return page; 1033b6df4b79SXiubo Li } 1034b6df4b79SXiubo Li 1035b6df4b79SXiubo Li /* 1036b6df4b79SXiubo Li * Normally it shouldn't be here: 1037b6df4b79SXiubo Li * Only when the userspace has touched the blocks which 1038b6df4b79SXiubo Li * are out of the tcmu_cmd's data iov[], and will return 1039b6df4b79SXiubo Li * one zeroed page. 1040b6df4b79SXiubo Li */ 1041b6df4b79SXiubo Li pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); 1042b6df4b79SXiubo Li pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); 1043b6df4b79SXiubo Li 1044b6df4b79SXiubo Li if (dbi >= udev->dbi_thresh) { 1045b6df4b79SXiubo Li /* Extern the udev->dbi_thresh to dbi + 1 */ 1046b6df4b79SXiubo Li udev->dbi_thresh = dbi + 1; 1047b6df4b79SXiubo Li udev->dbi_max = dbi; 1048b6df4b79SXiubo Li } 1049b6df4b79SXiubo Li 1050b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 1051b6df4b79SXiubo Li if (!page) { 1052b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL | __GFP_ZERO); 1053b6df4b79SXiubo Li if (!page) { 1054b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1055b6df4b79SXiubo Li return NULL; 1056b6df4b79SXiubo Li } 1057b6df4b79SXiubo Li 1058b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 1059b6df4b79SXiubo Li if (ret) { 1060b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1061b6df4b79SXiubo Li __free_page(page); 1062b6df4b79SXiubo Li return NULL; 1063b6df4b79SXiubo Li } 1064b6df4b79SXiubo Li 1065b6df4b79SXiubo Li /* 1066b6df4b79SXiubo Li * Since this case is rare in page fault routine, here we 1067b6df4b79SXiubo Li * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS 1068b6df4b79SXiubo Li * to reduce possible page fault call trace. 1069b6df4b79SXiubo Li */ 1070b6df4b79SXiubo Li atomic_inc(&global_db_count); 1071b6df4b79SXiubo Li } 1072b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1073b6df4b79SXiubo Li 1074b6df4b79SXiubo Li return page; 1075b6df4b79SXiubo Li } 1076b6df4b79SXiubo Li 107711bac800SDave Jiang static int tcmu_vma_fault(struct vm_fault *vmf) 10787c9e7a6fSAndy Grover { 107911bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 10807c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 10817c9e7a6fSAndy Grover struct page *page; 10827c9e7a6fSAndy Grover unsigned long offset; 10837c9e7a6fSAndy Grover void *addr; 10847c9e7a6fSAndy Grover 108511bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 10867c9e7a6fSAndy Grover if (mi < 0) 10877c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 10887c9e7a6fSAndy Grover 10897c9e7a6fSAndy Grover /* 10907c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 10917c9e7a6fSAndy Grover * to use mem[N]. 10927c9e7a6fSAndy Grover */ 10937c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 10947c9e7a6fSAndy Grover 1095141685a3SXiubo Li if (offset < udev->data_off) { 1096141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 10977c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 10987c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1099141685a3SXiubo Li } else { 1100141685a3SXiubo Li uint32_t dbi; 1101141685a3SXiubo Li 1102b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1103141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1104b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1105b6df4b79SXiubo Li if (!page) 1106141685a3SXiubo Li return VM_FAULT_NOPAGE; 1107141685a3SXiubo Li } 1108141685a3SXiubo Li 11097c9e7a6fSAndy Grover get_page(page); 11107c9e7a6fSAndy Grover vmf->page = page; 11117c9e7a6fSAndy Grover return 0; 11127c9e7a6fSAndy Grover } 11137c9e7a6fSAndy Grover 11147c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 11157c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 11167c9e7a6fSAndy Grover }; 11177c9e7a6fSAndy Grover 11187c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 11197c9e7a6fSAndy Grover { 11207c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 11217c9e7a6fSAndy Grover 11227c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 11237c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 11247c9e7a6fSAndy Grover 11257c9e7a6fSAndy Grover vma->vm_private_data = udev; 11267c9e7a6fSAndy Grover 11277c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 11287c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 11297c9e7a6fSAndy Grover return -EINVAL; 11307c9e7a6fSAndy Grover 11317c9e7a6fSAndy Grover return 0; 11327c9e7a6fSAndy Grover } 11337c9e7a6fSAndy Grover 11347c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 11357c9e7a6fSAndy Grover { 11367c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 11377c9e7a6fSAndy Grover 11387c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 11397c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 11407c9e7a6fSAndy Grover return -EBUSY; 11417c9e7a6fSAndy Grover 1142b6df4b79SXiubo Li udev->inode = inode; 1143b6df4b79SXiubo Li 11447c9e7a6fSAndy Grover pr_debug("open\n"); 11457c9e7a6fSAndy Grover 11467c9e7a6fSAndy Grover return 0; 11477c9e7a6fSAndy Grover } 11487c9e7a6fSAndy Grover 1149f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1150f3cdbe39SMike Christie { 1151f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1152f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1153f3cdbe39SMike Christie 1154f3cdbe39SMike Christie kfree(udev->uio_info.name); 1155f3cdbe39SMike Christie kfree(udev->name); 1156f3cdbe39SMike Christie kfree(udev); 1157f3cdbe39SMike Christie } 1158f3cdbe39SMike Christie 1159f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1160f3cdbe39SMike Christie { 1161f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1162f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1163f3cdbe39SMike Christie 1164f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1165f3cdbe39SMike Christie } 1166f3cdbe39SMike Christie 11677c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 11687c9e7a6fSAndy Grover { 11697c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 11707c9e7a6fSAndy Grover 11717c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 11727c9e7a6fSAndy Grover 11737c9e7a6fSAndy Grover pr_debug("close\n"); 1174f3cdbe39SMike Christie /* release ref from configure */ 1175f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 11767c9e7a6fSAndy Grover return 0; 11777c9e7a6fSAndy Grover } 11787c9e7a6fSAndy Grover 11797c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 11807c9e7a6fSAndy Grover { 11817c9e7a6fSAndy Grover struct sk_buff *skb; 11827c9e7a6fSAndy Grover void *msg_header; 11836e14eab9SNicholas Bellinger int ret = -ENOMEM; 11847c9e7a6fSAndy Grover 11857c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 11867c9e7a6fSAndy Grover if (!skb) 11876e14eab9SNicholas Bellinger return ret; 11887c9e7a6fSAndy Grover 11897c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 11906e14eab9SNicholas Bellinger if (!msg_header) 11916e14eab9SNicholas Bellinger goto free_skb; 11927c9e7a6fSAndy Grover 11937c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 11946e14eab9SNicholas Bellinger if (ret < 0) 11956e14eab9SNicholas Bellinger goto free_skb; 11967c9e7a6fSAndy Grover 11977c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 11986e14eab9SNicholas Bellinger if (ret < 0) 11996e14eab9SNicholas Bellinger goto free_skb; 12007c9e7a6fSAndy Grover 1201053c095aSJohannes Berg genlmsg_end(skb, msg_header); 12027c9e7a6fSAndy Grover 120320c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 12047c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 12057c9e7a6fSAndy Grover 12067c9e7a6fSAndy Grover /* We don't care if no one is listening */ 12077c9e7a6fSAndy Grover if (ret == -ESRCH) 12087c9e7a6fSAndy Grover ret = 0; 12097c9e7a6fSAndy Grover 12107c9e7a6fSAndy Grover return ret; 12116e14eab9SNicholas Bellinger free_skb: 12126e14eab9SNicholas Bellinger nlmsg_free(skb); 12136e14eab9SNicholas Bellinger return ret; 12147c9e7a6fSAndy Grover } 12157c9e7a6fSAndy Grover 12167c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 12177c9e7a6fSAndy Grover { 12187c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 12197c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 12207c9e7a6fSAndy Grover struct uio_info *info; 12217c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 12227c9e7a6fSAndy Grover size_t size; 12237c9e7a6fSAndy Grover size_t used; 12247c9e7a6fSAndy Grover int ret = 0; 12257c9e7a6fSAndy Grover char *str; 12267c9e7a6fSAndy Grover 12277c9e7a6fSAndy Grover info = &udev->uio_info; 12287c9e7a6fSAndy Grover 12297c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 12307c9e7a6fSAndy Grover udev->dev_config); 12317c9e7a6fSAndy Grover size += 1; /* for \0 */ 12327c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 12337c9e7a6fSAndy Grover if (!str) 12347c9e7a6fSAndy Grover return -ENOMEM; 12357c9e7a6fSAndy Grover 12367c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 12377c9e7a6fSAndy Grover 12387c9e7a6fSAndy Grover if (udev->dev_config[0]) 12397c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 12407c9e7a6fSAndy Grover 12417c9e7a6fSAndy Grover info->name = str; 12427c9e7a6fSAndy Grover 1243141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 12447c9e7a6fSAndy Grover if (!udev->mb_addr) { 12457c9e7a6fSAndy Grover ret = -ENOMEM; 12467c9e7a6fSAndy Grover goto err_vzalloc; 12477c9e7a6fSAndy Grover } 12487c9e7a6fSAndy Grover 12497c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 12507c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 12517c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 1252141685a3SXiubo Li udev->data_size = DATA_SIZE; 1253b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 1254b6df4b79SXiubo Li udev->waiting_global = false; 12557c9e7a6fSAndy Grover 1256141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 12577c9e7a6fSAndy Grover mb = udev->mb_addr; 12580ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 125932c76de3SSheng Yang mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; 12607c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 12617c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 12627c9e7a6fSAndy Grover 12637c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 12647c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 126526418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 12667c9e7a6fSAndy Grover 1267b6df4b79SXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1268141685a3SXiubo Li 1269ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 12707c9e7a6fSAndy Grover 12717c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 12720633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 12737c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 1274141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 12757c9e7a6fSAndy Grover 12767c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 12777c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 12787c9e7a6fSAndy Grover 12797c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 12807c9e7a6fSAndy Grover info->open = tcmu_open; 12817c9e7a6fSAndy Grover info->release = tcmu_release; 12827c9e7a6fSAndy Grover 12837c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 12847c9e7a6fSAndy Grover if (ret) 12857c9e7a6fSAndy Grover goto err_register; 12867c9e7a6fSAndy Grover 128781ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 128881ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 12897c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 129081ee28deSSheng Yang /* Other attributes can be configured in userspace */ 12913abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 12927c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 12939a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 12949a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 12957c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 12967c9e7a6fSAndy Grover 1297f3cdbe39SMike Christie /* 1298f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1299f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1300f3cdbe39SMike Christie */ 1301f3cdbe39SMike Christie kref_get(&udev->kref); 1302f3cdbe39SMike Christie 13037c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 13047c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 13057c9e7a6fSAndy Grover if (ret) 13067c9e7a6fSAndy Grover goto err_netlink; 13077c9e7a6fSAndy Grover 1308b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1309b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1310b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1311b6df4b79SXiubo Li 13127c9e7a6fSAndy Grover return 0; 13137c9e7a6fSAndy Grover 13147c9e7a6fSAndy Grover err_netlink: 1315f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 13167c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 13177c9e7a6fSAndy Grover err_register: 13187c9e7a6fSAndy Grover vfree(udev->mb_addr); 13197c9e7a6fSAndy Grover err_vzalloc: 13207c9e7a6fSAndy Grover kfree(info->name); 1321f3cdbe39SMike Christie info->name = NULL; 13227c9e7a6fSAndy Grover 13237c9e7a6fSAndy Grover return ret; 13247c9e7a6fSAndy Grover } 13257c9e7a6fSAndy Grover 1326b25c7863SSheng Yang static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 13277c9e7a6fSAndy Grover { 1328b25c7863SSheng Yang if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1329b25c7863SSheng Yang kmem_cache_free(tcmu_cmd_cache, cmd); 13307c9e7a6fSAndy Grover return 0; 1331b25c7863SSheng Yang } 13327c9e7a6fSAndy Grover return -EINVAL; 13337c9e7a6fSAndy Grover } 13347c9e7a6fSAndy Grover 1335972c7f16SMike Christie static bool tcmu_dev_configured(struct tcmu_dev *udev) 1336972c7f16SMike Christie { 1337972c7f16SMike Christie return udev->uio_info.uio_dev ? true : false; 1338972c7f16SMike Christie } 1339972c7f16SMike Christie 1340b6df4b79SXiubo Li static void tcmu_blocks_release(struct tcmu_dev *udev) 1341b6df4b79SXiubo Li { 1342b6df4b79SXiubo Li int i; 1343b6df4b79SXiubo Li struct page *page; 1344b6df4b79SXiubo Li 1345b6df4b79SXiubo Li /* Try to release all block pages */ 1346b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1347b6df4b79SXiubo Li for (i = 0; i <= udev->dbi_max; i++) { 1348b6df4b79SXiubo Li page = radix_tree_delete(&udev->data_blocks, i); 1349b6df4b79SXiubo Li if (page) { 1350b6df4b79SXiubo Li __free_page(page); 1351b6df4b79SXiubo Li atomic_dec(&global_db_count); 1352b6df4b79SXiubo Li } 1353b6df4b79SXiubo Li } 1354b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1355b6df4b79SXiubo Li } 1356b6df4b79SXiubo Li 13577c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 13587c9e7a6fSAndy Grover { 13597c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 1360b25c7863SSheng Yang struct tcmu_cmd *cmd; 1361b25c7863SSheng Yang bool all_expired = true; 13627c9e7a6fSAndy Grover int i; 13637c9e7a6fSAndy Grover 13647c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 13657c9e7a6fSAndy Grover 1366b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1367b6df4b79SXiubo Li list_del(&udev->node); 1368b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1369b6df4b79SXiubo Li 13707c9e7a6fSAndy Grover vfree(udev->mb_addr); 13717c9e7a6fSAndy Grover 13727c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 13737c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1374b25c7863SSheng Yang idr_for_each_entry(&udev->commands, cmd, i) { 1375b25c7863SSheng Yang if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1376b25c7863SSheng Yang all_expired = false; 1377b25c7863SSheng Yang } 13787c9e7a6fSAndy Grover idr_destroy(&udev->commands); 13797c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1380b25c7863SSheng Yang WARN_ON(!all_expired); 13817c9e7a6fSAndy Grover 1382b6df4b79SXiubo Li tcmu_blocks_release(udev); 1383141685a3SXiubo Li 1384972c7f16SMike Christie if (tcmu_dev_configured(udev)) { 13857c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 13867c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 13877c9e7a6fSAndy Grover 13887c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 13897c9e7a6fSAndy Grover } 1390f3cdbe39SMike Christie 1391f3cdbe39SMike Christie /* release ref from init */ 1392f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 13937c9e7a6fSAndy Grover } 13947c9e7a6fSAndy Grover 13957c9e7a6fSAndy Grover enum { 13963abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 13977d7a7435SNicholas Bellinger Opt_err, 13987c9e7a6fSAndy Grover }; 13997c9e7a6fSAndy Grover 14007c9e7a6fSAndy Grover static match_table_t tokens = { 14017c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 14027c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 14039c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 14043abaa2bfSMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%u"}, 14057c9e7a6fSAndy Grover {Opt_err, NULL} 14067c9e7a6fSAndy Grover }; 14077c9e7a6fSAndy Grover 14083abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 14093abaa2bfSMike Christie { 14103abaa2bfSMike Christie unsigned long tmp_ul; 14113abaa2bfSMike Christie char *arg_p; 14123abaa2bfSMike Christie int ret; 14133abaa2bfSMike Christie 14143abaa2bfSMike Christie arg_p = match_strdup(arg); 14153abaa2bfSMike Christie if (!arg_p) 14163abaa2bfSMike Christie return -ENOMEM; 14173abaa2bfSMike Christie 14183abaa2bfSMike Christie ret = kstrtoul(arg_p, 0, &tmp_ul); 14193abaa2bfSMike Christie kfree(arg_p); 14203abaa2bfSMike Christie if (ret < 0) { 14213abaa2bfSMike Christie pr_err("kstrtoul() failed for dev attrib\n"); 14223abaa2bfSMike Christie return ret; 14233abaa2bfSMike Christie } 14243abaa2bfSMike Christie if (!tmp_ul) { 14253abaa2bfSMike Christie pr_err("dev attrib must be nonzero\n"); 14263abaa2bfSMike Christie return -EINVAL; 14273abaa2bfSMike Christie } 14283abaa2bfSMike Christie *dev_attrib = tmp_ul; 14293abaa2bfSMike Christie return 0; 14303abaa2bfSMike Christie } 14313abaa2bfSMike Christie 14327c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 14337c9e7a6fSAndy Grover const char *page, ssize_t count) 14347c9e7a6fSAndy Grover { 14357c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 14367c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 14377c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 14387c9e7a6fSAndy Grover int ret = 0, token; 14397c9e7a6fSAndy Grover 14407c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 14417c9e7a6fSAndy Grover if (!opts) 14427c9e7a6fSAndy Grover return -ENOMEM; 14437c9e7a6fSAndy Grover 14447c9e7a6fSAndy Grover orig = opts; 14457c9e7a6fSAndy Grover 14467c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 14477c9e7a6fSAndy Grover if (!*ptr) 14487c9e7a6fSAndy Grover continue; 14497c9e7a6fSAndy Grover 14507c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 14517c9e7a6fSAndy Grover switch (token) { 14527c9e7a6fSAndy Grover case Opt_dev_config: 14537c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 14547c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 14557c9e7a6fSAndy Grover ret = -EINVAL; 14567c9e7a6fSAndy Grover break; 14577c9e7a6fSAndy Grover } 14587c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 14597c9e7a6fSAndy Grover break; 14607c9e7a6fSAndy Grover case Opt_dev_size: 14617c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 14627c9e7a6fSAndy Grover if (!arg_p) { 14637c9e7a6fSAndy Grover ret = -ENOMEM; 14647c9e7a6fSAndy Grover break; 14657c9e7a6fSAndy Grover } 14667c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 14677c9e7a6fSAndy Grover kfree(arg_p); 14687c9e7a6fSAndy Grover if (ret < 0) 14697c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 14707c9e7a6fSAndy Grover break; 14719c1cd1b6SAndy Grover case Opt_hw_block_size: 14723abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 14733abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 14749c1cd1b6SAndy Grover break; 14753abaa2bfSMike Christie case Opt_hw_max_sectors: 14763abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 14773abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 14789c1cd1b6SAndy Grover break; 14797c9e7a6fSAndy Grover default: 14807c9e7a6fSAndy Grover break; 14817c9e7a6fSAndy Grover } 14822579325cSMike Christie 14832579325cSMike Christie if (ret) 14842579325cSMike Christie break; 14857c9e7a6fSAndy Grover } 14867c9e7a6fSAndy Grover 14877c9e7a6fSAndy Grover kfree(orig); 14887c9e7a6fSAndy Grover return (!ret) ? count : ret; 14897c9e7a6fSAndy Grover } 14907c9e7a6fSAndy Grover 14917c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 14927c9e7a6fSAndy Grover { 14937c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 14947c9e7a6fSAndy Grover ssize_t bl = 0; 14957c9e7a6fSAndy Grover 14967c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 14977c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 14987d7a7435SNicholas Bellinger bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 14997c9e7a6fSAndy Grover 15007c9e7a6fSAndy Grover return bl; 15017c9e7a6fSAndy Grover } 15027c9e7a6fSAndy Grover 15037c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 15047c9e7a6fSAndy Grover { 15057c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 15067c9e7a6fSAndy Grover 15077c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 15087c9e7a6fSAndy Grover dev->dev_attrib.block_size); 15097c9e7a6fSAndy Grover } 15107c9e7a6fSAndy Grover 15117c9e7a6fSAndy Grover static sense_reason_t 15127c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 15137c9e7a6fSAndy Grover { 151402eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 15159c1cd1b6SAndy Grover } 15169c1cd1b6SAndy Grover 15177d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 15187d7a7435SNicholas Bellinger { 15197d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 15207d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 15217d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 15227d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 15237d7a7435SNicholas Bellinger 15247d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 15257d7a7435SNicholas Bellinger } 15267d7a7435SNicholas Bellinger 15277d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 15287d7a7435SNicholas Bellinger size_t count) 15297d7a7435SNicholas Bellinger { 15307d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 15317d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 15327d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 15337d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 15347d7a7435SNicholas Bellinger u32 val; 15357d7a7435SNicholas Bellinger int ret; 15367d7a7435SNicholas Bellinger 15377d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 15387d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 15397d7a7435SNicholas Bellinger return -EINVAL; 15407d7a7435SNicholas Bellinger } 15417d7a7435SNicholas Bellinger 15427d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 15437d7a7435SNicholas Bellinger if (ret < 0) 15447d7a7435SNicholas Bellinger return ret; 15457d7a7435SNicholas Bellinger 15467d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 15477d7a7435SNicholas Bellinger return count; 15487d7a7435SNicholas Bellinger } 15497d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 15507d7a7435SNicholas Bellinger 1551801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 1552801fc54dSBryant G. Ly { 1553801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1554801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 1555801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1556801fc54dSBryant G. Ly 1557801fc54dSBryant G. Ly return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); 1558801fc54dSBryant G. Ly } 1559801fc54dSBryant G. Ly 1560801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 1561801fc54dSBryant G. Ly size_t count) 1562801fc54dSBryant G. Ly { 1563801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1564801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 1565801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1566801fc54dSBryant G. Ly unsigned long val; 1567801fc54dSBryant G. Ly int ret; 1568801fc54dSBryant G. Ly 1569801fc54dSBryant G. Ly ret = kstrtoul(page, 0, &val); 1570801fc54dSBryant G. Ly if (ret < 0) 1571801fc54dSBryant G. Ly return ret; 1572801fc54dSBryant G. Ly udev->dev_size = val; 1573801fc54dSBryant G. Ly 1574801fc54dSBryant G. Ly /* Check if device has been configured before */ 1575801fc54dSBryant G. Ly if (tcmu_dev_configured(udev)) { 1576801fc54dSBryant G. Ly ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE, 1577801fc54dSBryant G. Ly udev->uio_info.name, 1578801fc54dSBryant G. Ly udev->uio_info.uio_dev->minor); 1579801fc54dSBryant G. Ly if (ret) { 1580801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 1581801fc54dSBryant G. Ly return ret; 1582801fc54dSBryant G. Ly } 1583801fc54dSBryant G. Ly } 1584801fc54dSBryant G. Ly 1585801fc54dSBryant G. Ly return count; 1586801fc54dSBryant G. Ly } 1587801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 1588801fc54dSBryant G. Ly 15899a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 15909a8bb606SBryant G. Ly char *page) 15919a8bb606SBryant G. Ly { 15929a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 15939a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 15949a8bb606SBryant G. Ly 15959a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 15969a8bb606SBryant G. Ly } 15979a8bb606SBryant G. Ly 15989a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 15999a8bb606SBryant G. Ly const char *page, size_t count) 16009a8bb606SBryant G. Ly { 16019a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 16029a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 16031068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 16049a8bb606SBryant G. Ly int val; 16059a8bb606SBryant G. Ly int ret; 16069a8bb606SBryant G. Ly 16079a8bb606SBryant G. Ly ret = kstrtouint(page, 0, &val); 16089a8bb606SBryant G. Ly if (ret < 0) 16099a8bb606SBryant G. Ly return ret; 16109a8bb606SBryant G. Ly 16119a8bb606SBryant G. Ly da->emulate_write_cache = val; 16121068be7bSBryant G. Ly 16131068be7bSBryant G. Ly /* Check if device has been configured before */ 16141068be7bSBryant G. Ly if (tcmu_dev_configured(udev)) { 16151068be7bSBryant G. Ly ret = tcmu_netlink_event(TCMU_CMD_RECONFIG_DEVICE, 16161068be7bSBryant G. Ly udev->uio_info.name, 16171068be7bSBryant G. Ly udev->uio_info.uio_dev->minor); 16181068be7bSBryant G. Ly if (ret) { 16191068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 16201068be7bSBryant G. Ly return ret; 16211068be7bSBryant G. Ly } 16221068be7bSBryant G. Ly } 16239a8bb606SBryant G. Ly return count; 16249a8bb606SBryant G. Ly } 16259a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 16269a8bb606SBryant G. Ly 1627801fc54dSBryant G. Ly struct configfs_attribute *tcmu_attrib_attrs[] = { 1628801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 1629801fc54dSBryant G. Ly &tcmu_attr_dev_size, 1630801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 1631801fc54dSBryant G. Ly NULL, 1632801fc54dSBryant G. Ly }; 1633801fc54dSBryant G. Ly 16347d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 16357d7a7435SNicholas Bellinger 16367d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 16377c9e7a6fSAndy Grover .name = "user", 16387c9e7a6fSAndy Grover .owner = THIS_MODULE, 1639a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 16407c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 16417c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 16427c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 16437c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 16447c9e7a6fSAndy Grover .free_device = tcmu_free_device, 16457c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 16467c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 16477c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 16487c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 16497c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 16507d7a7435SNicholas Bellinger .tb_dev_attrib_attrs = NULL, 16517c9e7a6fSAndy Grover }; 16527c9e7a6fSAndy Grover 1653b6df4b79SXiubo Li static int unmap_thread_fn(void *data) 1654b6df4b79SXiubo Li { 1655b6df4b79SXiubo Li struct tcmu_dev *udev; 1656b6df4b79SXiubo Li loff_t off; 1657b6df4b79SXiubo Li uint32_t start, end, block; 1658b6df4b79SXiubo Li struct page *page; 1659b6df4b79SXiubo Li int i; 1660b6df4b79SXiubo Li 1661b6df4b79SXiubo Li while (1) { 1662b6df4b79SXiubo Li DEFINE_WAIT(__wait); 1663b6df4b79SXiubo Li 1664b6df4b79SXiubo Li prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); 1665b6df4b79SXiubo Li schedule(); 1666b6df4b79SXiubo Li finish_wait(&unmap_wait, &__wait); 1667b6df4b79SXiubo Li 1668d906d8afSMike Christie if (kthread_should_stop()) 1669d906d8afSMike Christie break; 1670d906d8afSMike Christie 1671b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1672b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 1673b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1674b6df4b79SXiubo Li 1675b6df4b79SXiubo Li /* Try to complete the finished commands first */ 1676b6df4b79SXiubo Li tcmu_handle_completions(udev); 1677b6df4b79SXiubo Li 1678b6df4b79SXiubo Li /* Skip the udevs waiting the global pool or in idle */ 1679b6df4b79SXiubo Li if (udev->waiting_global || !udev->dbi_thresh) { 1680b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1681b6df4b79SXiubo Li continue; 1682b6df4b79SXiubo Li } 1683b6df4b79SXiubo Li 1684b6df4b79SXiubo Li end = udev->dbi_max + 1; 1685b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 1686b6df4b79SXiubo Li if (block == udev->dbi_max) { 1687b6df4b79SXiubo Li /* 1688b6df4b79SXiubo Li * The last bit is dbi_max, so there is 1689b6df4b79SXiubo Li * no need to shrink any blocks. 1690b6df4b79SXiubo Li */ 1691b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1692b6df4b79SXiubo Li continue; 1693b6df4b79SXiubo Li } else if (block == end) { 1694b6df4b79SXiubo Li /* The current udev will goto idle state */ 1695b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 1696b6df4b79SXiubo Li udev->dbi_max = 0; 1697b6df4b79SXiubo Li } else { 1698b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 1699b6df4b79SXiubo Li udev->dbi_max = block; 1700b6df4b79SXiubo Li } 1701b6df4b79SXiubo Li 1702b6df4b79SXiubo Li /* Here will truncate the data area from off */ 1703b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 1704b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 1705b6df4b79SXiubo Li 1706b6df4b79SXiubo Li /* Release the block pages */ 1707b6df4b79SXiubo Li for (i = start; i < end; i++) { 1708b6df4b79SXiubo Li page = radix_tree_delete(&udev->data_blocks, i); 1709b6df4b79SXiubo Li if (page) { 1710b6df4b79SXiubo Li __free_page(page); 1711b6df4b79SXiubo Li atomic_dec(&global_db_count); 1712b6df4b79SXiubo Li } 1713b6df4b79SXiubo Li } 1714b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1715b6df4b79SXiubo Li } 1716b6df4b79SXiubo Li 1717b6df4b79SXiubo Li /* 1718b6df4b79SXiubo Li * Try to wake up the udevs who are waiting 1719b6df4b79SXiubo Li * for the global data pool. 1720b6df4b79SXiubo Li */ 1721b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 1722b6df4b79SXiubo Li if (udev->waiting_global) 1723b6df4b79SXiubo Li wake_up(&udev->wait_cmdr); 1724b6df4b79SXiubo Li } 1725b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1726b6df4b79SXiubo Li } 1727b6df4b79SXiubo Li 1728b6df4b79SXiubo Li return 0; 1729b6df4b79SXiubo Li } 1730b6df4b79SXiubo Li 17317c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 17327c9e7a6fSAndy Grover { 1733801fc54dSBryant G. Ly int ret, i, k, len = 0; 17347c9e7a6fSAndy Grover 17357c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 17367c9e7a6fSAndy Grover 17377c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 17387c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 17397c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 17407c9e7a6fSAndy Grover 0, NULL); 17417c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 17427c9e7a6fSAndy Grover return -ENOMEM; 17437c9e7a6fSAndy Grover 17447c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 17457c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 17467c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 17477c9e7a6fSAndy Grover goto out_free_cache; 17487c9e7a6fSAndy Grover } 17497c9e7a6fSAndy Grover 17507c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 17517c9e7a6fSAndy Grover if (ret < 0) { 17527c9e7a6fSAndy Grover goto out_unreg_device; 17537c9e7a6fSAndy Grover } 17547c9e7a6fSAndy Grover 17557d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 17567d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 17577d7a7435SNicholas Bellinger } 1758801fc54dSBryant G. Ly for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { 1759801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 1760801fc54dSBryant G. Ly } 1761801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 17627d7a7435SNicholas Bellinger 17637d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 17647d7a7435SNicholas Bellinger if (!tcmu_attrs) { 17657d7a7435SNicholas Bellinger ret = -ENOMEM; 17667d7a7435SNicholas Bellinger goto out_unreg_genl; 17677d7a7435SNicholas Bellinger } 17687d7a7435SNicholas Bellinger 17697d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 17707d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 17717d7a7435SNicholas Bellinger } 1772801fc54dSBryant G. Ly for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { 1773801fc54dSBryant G. Ly tcmu_attrs[i] = tcmu_attrib_attrs[k]; 17749a8bb606SBryant G. Ly i++; 1775801fc54dSBryant G. Ly } 17767d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 17777d7a7435SNicholas Bellinger 17780a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 17797c9e7a6fSAndy Grover if (ret) 17807d7a7435SNicholas Bellinger goto out_attrs; 17817c9e7a6fSAndy Grover 1782b6df4b79SXiubo Li init_waitqueue_head(&unmap_wait); 1783b6df4b79SXiubo Li unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); 1784b6df4b79SXiubo Li if (IS_ERR(unmap_thread)) { 1785b6df4b79SXiubo Li ret = PTR_ERR(unmap_thread); 1786b6df4b79SXiubo Li goto out_unreg_transport; 1787b6df4b79SXiubo Li } 1788b6df4b79SXiubo Li 17897c9e7a6fSAndy Grover return 0; 17907c9e7a6fSAndy Grover 1791b6df4b79SXiubo Li out_unreg_transport: 1792b6df4b79SXiubo Li target_backend_unregister(&tcmu_ops); 17937d7a7435SNicholas Bellinger out_attrs: 17947d7a7435SNicholas Bellinger kfree(tcmu_attrs); 17957c9e7a6fSAndy Grover out_unreg_genl: 17967c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 17977c9e7a6fSAndy Grover out_unreg_device: 17987c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 17997c9e7a6fSAndy Grover out_free_cache: 18007c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 18017c9e7a6fSAndy Grover 18027c9e7a6fSAndy Grover return ret; 18037c9e7a6fSAndy Grover } 18047c9e7a6fSAndy Grover 18057c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 18067c9e7a6fSAndy Grover { 1807b6df4b79SXiubo Li kthread_stop(unmap_thread); 18080a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 18097d7a7435SNicholas Bellinger kfree(tcmu_attrs); 18107c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 18117c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 18127c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 18137c9e7a6fSAndy Grover } 18147c9e7a6fSAndy Grover 18157c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 18167c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 18177c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 18187c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 18197c9e7a6fSAndy Grover 18207c9e7a6fSAndy Grover module_init(tcmu_module_init); 18217c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1822