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 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) 827c9e7a6fSAndy Grover 83b6df4b79SXiubo Li /* The total size of the ring is 8M + 256K * PAGE_SIZE */ 847c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 857c9e7a6fSAndy Grover 86af1dd7ffSMike Christie /* 87af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 88af1dd7ffSMike Christie * when the unmap thread will be started. 89af1dd7ffSMike Christie */ 90b6df4b79SXiubo Li #define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024) 91b6df4b79SXiubo Li 92b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 93b3af66e2SMike Christie 947c9e7a6fSAndy Grover static struct device *tcmu_root_device; 957c9e7a6fSAndy Grover 967c9e7a6fSAndy Grover struct tcmu_hba { 977c9e7a6fSAndy Grover u32 host_id; 987c9e7a6fSAndy Grover }; 997c9e7a6fSAndy Grover 1007c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 1017c9e7a6fSAndy Grover 102b3af66e2SMike Christie struct tcmu_nl_cmd { 103b3af66e2SMike Christie /* wake up thread waiting for reply */ 104b3af66e2SMike Christie struct completion complete; 105b3af66e2SMike Christie int cmd; 106b3af66e2SMike Christie int status; 107b3af66e2SMike Christie }; 108b3af66e2SMike Christie 1097c9e7a6fSAndy Grover struct tcmu_dev { 110b6df4b79SXiubo Li struct list_head node; 111f3cdbe39SMike Christie struct kref kref; 112af1dd7ffSMike Christie 1137c9e7a6fSAndy Grover struct se_device se_dev; 1147c9e7a6fSAndy Grover 1157c9e7a6fSAndy Grover char *name; 1167c9e7a6fSAndy Grover struct se_hba *hba; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1197c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 1207c9e7a6fSAndy Grover unsigned long flags; 1217c9e7a6fSAndy Grover 1227c9e7a6fSAndy Grover struct uio_info uio_info; 1237c9e7a6fSAndy Grover 124b6df4b79SXiubo Li struct inode *inode; 125b6df4b79SXiubo Li 1267c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1277c9e7a6fSAndy Grover size_t dev_size; 1287c9e7a6fSAndy Grover u32 cmdr_size; 1297c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1303d9b9555SAndy Grover /* Offset of data area from start of mb */ 13126418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1327c9e7a6fSAndy Grover size_t data_off; 1337c9e7a6fSAndy Grover size_t data_size; 13426418649SSheng Yang 135b6df4b79SXiubo Li struct mutex cmdr_lock; 136af1dd7ffSMike Christie struct list_head cmdr_queue; 1377c9e7a6fSAndy Grover 138141685a3SXiubo Li uint32_t dbi_max; 139b6df4b79SXiubo Li uint32_t dbi_thresh; 140141685a3SXiubo Li DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); 141141685a3SXiubo Li struct radix_tree_root data_blocks; 142141685a3SXiubo Li 1437c9e7a6fSAndy Grover struct idr commands; 1447c9e7a6fSAndy Grover 1457c9e7a6fSAndy Grover struct timer_list timeout; 146af980e46SMike Christie unsigned int cmd_time_out; 147488ebe4cSMike Christie struct list_head timedout_entry; 1487c9e7a6fSAndy Grover 149b3af66e2SMike Christie spinlock_t nl_cmd_lock; 150b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 151b3af66e2SMike Christie /* wake up threads waiting on curr_nl_cmd */ 152b3af66e2SMike Christie wait_queue_head_t nl_cmd_wq; 153b3af66e2SMike Christie 1547c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 155b849b456SKenjiro Nakayama 156b849b456SKenjiro Nakayama int nl_reply_supported; 1577c9e7a6fSAndy Grover }; 1587c9e7a6fSAndy Grover 1597c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1607c9e7a6fSAndy Grover 1617c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1627c9e7a6fSAndy Grover 1637c9e7a6fSAndy Grover struct tcmu_cmd { 1647c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1657c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 166af1dd7ffSMike Christie struct list_head cmdr_queue_entry; 1677c9e7a6fSAndy Grover 1687c9e7a6fSAndy Grover uint16_t cmd_id; 1697c9e7a6fSAndy Grover 17026418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1717c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 172141685a3SXiubo Li uint32_t dbi_cnt; 173141685a3SXiubo Li uint32_t dbi_cur; 174141685a3SXiubo Li uint32_t *dbi; 1757c9e7a6fSAndy Grover 1767c9e7a6fSAndy Grover unsigned long deadline; 1777c9e7a6fSAndy Grover 1787c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1797c9e7a6fSAndy Grover unsigned long flags; 1807c9e7a6fSAndy Grover }; 181af1dd7ffSMike Christie /* 182af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 183af1dd7ffSMike Christie * 184af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 185af1dd7ffSMike Christie * ... 186af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 187af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 188af1dd7ffSMike Christie * ... 189af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 190af1dd7ffSMike Christie */ 191b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 192b6df4b79SXiubo Li static LIST_HEAD(root_udev); 193b6df4b79SXiubo Li 194488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 195488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 196488ebe4cSMike Christie 197b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 198af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 199b6df4b79SXiubo Li 2007c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 2017c9e7a6fSAndy Grover 2027c9e7a6fSAndy Grover /* multicast group */ 2037c9e7a6fSAndy Grover enum tcmu_multicast_groups { 2047c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 2057c9e7a6fSAndy Grover }; 2067c9e7a6fSAndy Grover 2077c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 2087c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 2097c9e7a6fSAndy Grover }; 2107c9e7a6fSAndy Grover 211b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 212b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 213b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 214b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 215b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 216b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 217b3af66e2SMike Christie }; 218b3af66e2SMike Christie 219b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 220b3af66e2SMike Christie { 221b3af66e2SMike Christie struct se_device *dev; 222b3af66e2SMike Christie struct tcmu_dev *udev; 223b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 224b3af66e2SMike Christie int dev_id, rc, ret = 0; 225b3af66e2SMike Christie bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); 226b3af66e2SMike Christie 227b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 228b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 229b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 230b3af66e2SMike Christie return -EINVAL; 231b3af66e2SMike Christie } 232b3af66e2SMike Christie 233b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 234b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 235b3af66e2SMike Christie 236b3af66e2SMike Christie dev = target_find_device(dev_id, !is_removed); 237b3af66e2SMike Christie if (!dev) { 238b3af66e2SMike Christie printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", 239b3af66e2SMike Christie completed_cmd, rc, dev_id); 240b3af66e2SMike Christie return -ENODEV; 241b3af66e2SMike Christie } 242b3af66e2SMike Christie udev = TCMU_DEV(dev); 243b3af66e2SMike Christie 244b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 245b3af66e2SMike Christie nl_cmd = &udev->curr_nl_cmd; 246b3af66e2SMike Christie 247b3af66e2SMike Christie pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, 248b3af66e2SMike Christie nl_cmd->cmd, completed_cmd, rc); 249b3af66e2SMike Christie 250b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 251b3af66e2SMike Christie printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", 252b3af66e2SMike Christie completed_cmd, nl_cmd->cmd); 253b3af66e2SMike Christie ret = -EINVAL; 254b3af66e2SMike Christie } else { 255b3af66e2SMike Christie nl_cmd->status = rc; 256b3af66e2SMike Christie } 257b3af66e2SMike Christie 258b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 259b3af66e2SMike Christie if (!is_removed) 260b3af66e2SMike Christie target_undepend_item(&dev->dev_group.cg_item); 261b3af66e2SMike Christie if (!ret) 262b3af66e2SMike Christie complete(&nl_cmd->complete); 263b3af66e2SMike Christie return ret; 264b3af66e2SMike Christie } 265b3af66e2SMike Christie 266b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 267b3af66e2SMike Christie { 268b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 269b3af66e2SMike Christie } 270b3af66e2SMike Christie 271b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 272b3af66e2SMike Christie { 273b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 274b3af66e2SMike Christie } 275b3af66e2SMike Christie 276b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 277b3af66e2SMike Christie struct genl_info *info) 278b3af66e2SMike Christie { 279b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 280b3af66e2SMike Christie } 281b3af66e2SMike Christie 282b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 283b3af66e2SMike Christie { 284b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 285b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 286b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 287b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 288b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 289b3af66e2SMike Christie } 290b3af66e2SMike Christie 291b3af66e2SMike Christie return 0; 292b3af66e2SMike Christie } 293b3af66e2SMike Christie 294b3af66e2SMike Christie static const struct genl_ops tcmu_genl_ops[] = { 295b3af66e2SMike Christie { 296b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 297b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 298b3af66e2SMike Christie .policy = tcmu_attr_policy, 299b3af66e2SMike Christie .doit = tcmu_genl_set_features, 300b3af66e2SMike Christie }, 301b3af66e2SMike Christie { 302b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 303b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 304b3af66e2SMike Christie .policy = tcmu_attr_policy, 305b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 306b3af66e2SMike Christie }, 307b3af66e2SMike Christie { 308b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 309b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 310b3af66e2SMike Christie .policy = tcmu_attr_policy, 311b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 312b3af66e2SMike Christie }, 313b3af66e2SMike Christie { 314b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 315b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 316b3af66e2SMike Christie .policy = tcmu_attr_policy, 317b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 318b3af66e2SMike Christie }, 319b3af66e2SMike Christie }; 320b3af66e2SMike Christie 3217c9e7a6fSAndy Grover /* Our generic netlink family */ 32256989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 323489111e5SJohannes Berg .module = THIS_MODULE, 3247c9e7a6fSAndy Grover .hdrsize = 0, 3257c9e7a6fSAndy Grover .name = "TCM-USER", 326b3af66e2SMike Christie .version = 2, 3277c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 3287c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 3297c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 33020c08b36SSheng Yang .netnsok = true, 331b3af66e2SMike Christie .ops = tcmu_genl_ops, 332b3af66e2SMike Christie .n_ops = ARRAY_SIZE(tcmu_genl_ops), 3337c9e7a6fSAndy Grover }; 3347c9e7a6fSAndy Grover 335141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 336141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 337141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 338141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 339141685a3SXiubo Li 340b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 341141685a3SXiubo Li { 342141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 343141685a3SXiubo Li uint32_t i; 344141685a3SXiubo Li 345b6df4b79SXiubo Li for (i = 0; i < len; i++) 346141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 347141685a3SXiubo Li } 348141685a3SXiubo Li 349b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 350b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 351141685a3SXiubo Li { 352b6df4b79SXiubo Li struct page *page; 353b6df4b79SXiubo Li int ret, dbi; 354141685a3SXiubo Li 355b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 356b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 357b6df4b79SXiubo Li return false; 358b6df4b79SXiubo Li 359b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 360b6df4b79SXiubo Li if (!page) { 361b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 362af1dd7ffSMike Christie TCMU_GLOBAL_MAX_BLOCKS) 363af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 364b6df4b79SXiubo Li 365b6df4b79SXiubo Li /* try to get new page from the mm */ 366b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL); 367b6df4b79SXiubo Li if (!page) 368daf78c30SXiubo Li goto err_alloc; 369b6df4b79SXiubo Li 370b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 371daf78c30SXiubo Li if (ret) 372daf78c30SXiubo Li goto err_insert; 373b6df4b79SXiubo Li } 374b6df4b79SXiubo Li 375141685a3SXiubo Li if (dbi > udev->dbi_max) 376141685a3SXiubo Li udev->dbi_max = dbi; 377141685a3SXiubo Li 378141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 379b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 380141685a3SXiubo Li 381b6df4b79SXiubo Li return true; 382daf78c30SXiubo Li err_insert: 383daf78c30SXiubo Li __free_page(page); 384daf78c30SXiubo Li err_alloc: 385daf78c30SXiubo Li atomic_dec(&global_db_count); 386daf78c30SXiubo Li return false; 387141685a3SXiubo Li } 388141685a3SXiubo Li 389b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 390b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 391b6df4b79SXiubo Li { 392b6df4b79SXiubo Li int i; 393b6df4b79SXiubo Li 394b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 395b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 396af1dd7ffSMike Christie return false; 397141685a3SXiubo Li } 398b6df4b79SXiubo Li return true; 399141685a3SXiubo Li } 400141685a3SXiubo Li 401b6df4b79SXiubo Li static inline struct page * 402b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 403141685a3SXiubo Li { 404141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 405141685a3SXiubo Li } 406141685a3SXiubo Li 407141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 408141685a3SXiubo Li { 409141685a3SXiubo Li kfree(tcmu_cmd->dbi); 410141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 411141685a3SXiubo Li } 412141685a3SXiubo Li 413141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 414141685a3SXiubo Li { 415141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 416141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 417141685a3SXiubo Li 418141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 419141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 420141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 421141685a3SXiubo Li DATA_BLOCK_SIZE); 422141685a3SXiubo Li } 423141685a3SXiubo Li 424141685a3SXiubo Li return data_length; 425141685a3SXiubo Li } 426141685a3SXiubo Li 427141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 428141685a3SXiubo Li { 429141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 430141685a3SXiubo Li 431141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 432141685a3SXiubo Li } 433141685a3SXiubo Li 4347c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 4357c9e7a6fSAndy Grover { 4367c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 4377c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 4387c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 4397c9e7a6fSAndy Grover 4407c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 4417c9e7a6fSAndy Grover if (!tcmu_cmd) 4427c9e7a6fSAndy Grover return NULL; 4437c9e7a6fSAndy Grover 444af1dd7ffSMike Christie INIT_LIST_HEAD(&tcmu_cmd->cmdr_queue_entry); 4457c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 4467c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 4477c9e7a6fSAndy Grover 448141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 449141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 450141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 451141685a3SXiubo Li GFP_KERNEL); 452141685a3SXiubo Li if (!tcmu_cmd->dbi) { 453141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 454141685a3SXiubo Li return NULL; 455141685a3SXiubo Li } 456141685a3SXiubo Li 4577c9e7a6fSAndy Grover return tcmu_cmd; 4587c9e7a6fSAndy Grover } 4597c9e7a6fSAndy Grover 4607c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 4617c9e7a6fSAndy Grover { 462b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 46326d2b310Stangwenji void *start = vaddr - offset; 4647c9e7a6fSAndy Grover 4657c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 4667c9e7a6fSAndy Grover 4677c9e7a6fSAndy Grover while (size) { 46826d2b310Stangwenji flush_dcache_page(virt_to_page(start)); 46926d2b310Stangwenji start += PAGE_SIZE; 4707c9e7a6fSAndy Grover size -= PAGE_SIZE; 4717c9e7a6fSAndy Grover } 4727c9e7a6fSAndy Grover } 4737c9e7a6fSAndy Grover 4747c9e7a6fSAndy Grover /* 4757c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 4767c9e7a6fSAndy Grover * we can't use circ_buf.h. 4777c9e7a6fSAndy Grover */ 4787c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 4797c9e7a6fSAndy Grover { 4807c9e7a6fSAndy Grover int diff = head - tail; 4817c9e7a6fSAndy Grover 4827c9e7a6fSAndy Grover if (diff >= 0) 4837c9e7a6fSAndy Grover return diff; 4847c9e7a6fSAndy Grover else 4857c9e7a6fSAndy Grover return size + diff; 4867c9e7a6fSAndy Grover } 4877c9e7a6fSAndy Grover 4887c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 4897c9e7a6fSAndy Grover { 4907c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 4917c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 4927c9e7a6fSAndy Grover } 4937c9e7a6fSAndy Grover 4947c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 4957c9e7a6fSAndy Grover { 4967c9e7a6fSAndy Grover return size - head; 4977c9e7a6fSAndy Grover } 4987c9e7a6fSAndy Grover 4993e609135SXiubo Li static inline void new_iov(struct iovec **iov, int *iov_cnt) 500f1dbd087SSheng Yang { 501f1dbd087SSheng Yang struct iovec *iovec; 502f1dbd087SSheng Yang 503f1dbd087SSheng Yang if (*iov_cnt != 0) 504f1dbd087SSheng Yang (*iov)++; 505f1dbd087SSheng Yang (*iov_cnt)++; 506f1dbd087SSheng Yang 507f1dbd087SSheng Yang iovec = *iov; 508f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 509f1dbd087SSheng Yang } 510f1dbd087SSheng Yang 5117c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 5127c9e7a6fSAndy Grover 51326418649SSheng Yang /* offset is relative to mb_addr */ 514141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 515141685a3SXiubo Li int dbi, int remaining) 51626418649SSheng Yang { 517141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 51826418649SSheng Yang DATA_BLOCK_SIZE - remaining; 51926418649SSheng Yang } 52026418649SSheng Yang 521daf78c30SXiubo Li static inline size_t iov_tail(struct iovec *iov) 52226418649SSheng Yang { 52326418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 52426418649SSheng Yang } 52526418649SSheng Yang 5261a1fc0b8SMike Christie static void scatter_data_area(struct tcmu_dev *udev, 527141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 528141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 529141685a3SXiubo Li int *iov_cnt, bool copy_data) 530f97ec7dbSIlias Tsitsimpis { 531141685a3SXiubo Li int i, dbi; 53226418649SSheng Yang int block_remaining = 0; 533141685a3SXiubo Li void *from, *to = NULL; 534141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 535f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 536b6df4b79SXiubo Li struct page *page; 537f97ec7dbSIlias Tsitsimpis 538f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 53926418649SSheng Yang int sg_remaining = sg->length; 540f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 54126418649SSheng Yang while (sg_remaining > 0) { 54226418649SSheng Yang if (block_remaining == 0) { 543b6df4b79SXiubo Li if (to) 544b6df4b79SXiubo Li kunmap_atomic(to); 545b6df4b79SXiubo Li 54626418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 547b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 548b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 549b6df4b79SXiubo Li to = kmap_atomic(page); 550141685a3SXiubo Li } 551141685a3SXiubo Li 5523e609135SXiubo Li /* 5533e609135SXiubo Li * Covert to virtual offset of the ring data area. 5543e609135SXiubo Li */ 555141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 55626418649SSheng Yang block_remaining); 557141685a3SXiubo Li 5583e609135SXiubo Li /* 5593e609135SXiubo Li * The following code will gather and map the blocks 5603e609135SXiubo Li * to the same iovec when the blocks are all next to 5613e609135SXiubo Li * each other. 5623e609135SXiubo Li */ 5633e609135SXiubo Li copy_bytes = min_t(size_t, sg_remaining, 5643e609135SXiubo Li block_remaining); 56526418649SSheng Yang if (*iov_cnt != 0 && 566daf78c30SXiubo Li to_offset == iov_tail(*iov)) { 5673e609135SXiubo Li /* 5683e609135SXiubo Li * Will append to the current iovec, because 5693e609135SXiubo Li * the current block page is next to the 5703e609135SXiubo Li * previous one. 5713e609135SXiubo Li */ 572f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 57326418649SSheng Yang } else { 5743e609135SXiubo Li /* 5753e609135SXiubo Li * Will allocate a new iovec because we are 5763e609135SXiubo Li * first time here or the current block page 5773e609135SXiubo Li * is not next to the previous one. 5783e609135SXiubo Li */ 5793e609135SXiubo Li new_iov(iov, iov_cnt); 58026418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 581f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 58226418649SSheng Yang } 5833e609135SXiubo Li 584f97ec7dbSIlias Tsitsimpis if (copy_data) { 585c542942cSXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 586c542942cSXiubo Li memcpy(to + offset, 587c542942cSXiubo Li from + sg->length - sg_remaining, 58826418649SSheng Yang copy_bytes); 589f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 590f97ec7dbSIlias Tsitsimpis } 5913e609135SXiubo Li 59226418649SSheng Yang sg_remaining -= copy_bytes; 59326418649SSheng Yang block_remaining -= copy_bytes; 594f97ec7dbSIlias Tsitsimpis } 595e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 596f97ec7dbSIlias Tsitsimpis } 5973e609135SXiubo Li 598b6df4b79SXiubo Li if (to) 599b6df4b79SXiubo Li kunmap_atomic(to); 6000c28481fSSheng Yang } 6010c28481fSSheng Yang 602a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 603a5d68ba8SXiubo Li bool bidi) 604f97ec7dbSIlias Tsitsimpis { 605a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 606141685a3SXiubo Li int i, dbi; 60726418649SSheng Yang int block_remaining = 0; 608b6df4b79SXiubo Li void *from = NULL, *to; 609141685a3SXiubo Li size_t copy_bytes, offset; 610a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 611b6df4b79SXiubo Li struct page *page; 612a5d68ba8SXiubo Li unsigned int data_nents; 613141685a3SXiubo Li uint32_t count = 0; 614a5d68ba8SXiubo Li 615a5d68ba8SXiubo Li if (!bidi) { 616a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 617a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 618a5d68ba8SXiubo Li } else { 619a5d68ba8SXiubo Li 620a5d68ba8SXiubo Li /* 621a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 622a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 623a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 624a5d68ba8SXiubo Li */ 625a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 626a5d68ba8SXiubo Li 627a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 628a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 629a5d68ba8SXiubo Li } 630f97ec7dbSIlias Tsitsimpis 631141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 632141685a3SXiubo Li 633f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 63426418649SSheng Yang int sg_remaining = sg->length; 635f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 63626418649SSheng Yang while (sg_remaining > 0) { 63726418649SSheng Yang if (block_remaining == 0) { 638b6df4b79SXiubo Li if (from) 639b6df4b79SXiubo Li kunmap_atomic(from); 640b6df4b79SXiubo Li 64126418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 642141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 643b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 644b6df4b79SXiubo Li from = kmap_atomic(page); 64526418649SSheng Yang } 64626418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 64726418649SSheng Yang block_remaining); 648141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 649f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 650c542942cSXiubo Li memcpy(to + sg->length - sg_remaining, from + offset, 65126418649SSheng Yang copy_bytes); 652f97ec7dbSIlias Tsitsimpis 65326418649SSheng Yang sg_remaining -= copy_bytes; 65426418649SSheng Yang block_remaining -= copy_bytes; 655f97ec7dbSIlias Tsitsimpis } 656e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 657f97ec7dbSIlias Tsitsimpis } 658b6df4b79SXiubo Li if (from) 659b6df4b79SXiubo Li kunmap_atomic(from); 660f97ec7dbSIlias Tsitsimpis } 661f97ec7dbSIlias Tsitsimpis 662b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 66326418649SSheng Yang { 6643c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 66526418649SSheng Yang } 66626418649SSheng Yang 6677c9e7a6fSAndy Grover /* 668f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 6693d9b9555SAndy Grover * space available on the data area. 6707c9e7a6fSAndy Grover * 6717c9e7a6fSAndy Grover * Called with ring lock held. 6727c9e7a6fSAndy Grover */ 673b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 674b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 6757c9e7a6fSAndy Grover { 6767c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 677b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 678b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 6790241fd39SNicholas Bellinger size_t space, cmd_needed; 6807c9e7a6fSAndy Grover u32 cmd_head; 6817c9e7a6fSAndy Grover 6827c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 6837c9e7a6fSAndy Grover 6847c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 6857c9e7a6fSAndy Grover 686f56574a2SAndy Grover /* 687f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 688f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 689f56574a2SAndy Grover */ 690f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 691f56574a2SAndy Grover cmd_needed = cmd_size; 692f56574a2SAndy Grover else 693f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 694f56574a2SAndy Grover 6957c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 6967c9e7a6fSAndy Grover if (space < cmd_needed) { 6977c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 6987c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 6997c9e7a6fSAndy Grover return false; 7007c9e7a6fSAndy Grover } 7017c9e7a6fSAndy Grover 702b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 703b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 7043c0f26ffSMike Christie if ((space * DATA_BLOCK_SIZE) < data_needed) { 7053c0f26ffSMike Christie unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh + 7063c0f26ffSMike Christie space; 707b6df4b79SXiubo Li 708b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 709b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 710b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 711b6df4b79SXiubo Li data_needed); 7127c9e7a6fSAndy Grover return false; 7137c9e7a6fSAndy Grover } 7147c9e7a6fSAndy Grover 715f890f579SMike Christie udev->dbi_thresh += blocks_needed; 716b6df4b79SXiubo Li if (udev->dbi_thresh > DATA_BLOCK_BITS) 717b6df4b79SXiubo Li udev->dbi_thresh = DATA_BLOCK_BITS; 718b6df4b79SXiubo Li } 719b6df4b79SXiubo Li 720daf78c30SXiubo Li return tcmu_get_empty_blocks(udev, cmd); 7217c9e7a6fSAndy Grover } 7227c9e7a6fSAndy Grover 723fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 724fe25cc34SXiubo Li { 725fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 726fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 727fe25cc34SXiubo Li } 728fe25cc34SXiubo Li 729fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 730fe25cc34SXiubo Li size_t base_command_size) 731fe25cc34SXiubo Li { 732fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 733fe25cc34SXiubo Li size_t command_size; 734fe25cc34SXiubo Li 735fe25cc34SXiubo Li command_size = base_command_size + 736fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 737fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 738fe25cc34SXiubo Li 739fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 740fe25cc34SXiubo Li 741fe25cc34SXiubo Li return command_size; 742fe25cc34SXiubo Li } 743fe25cc34SXiubo Li 7440d44374cSMike Christie static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd) 7450d44374cSMike Christie { 7460d44374cSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 7470d44374cSMike Christie unsigned long tmo = udev->cmd_time_out; 7480d44374cSMike Christie int cmd_id; 7490d44374cSMike Christie 750af1dd7ffSMike Christie /* 751af1dd7ffSMike Christie * If it was on the cmdr queue waiting we do not reset the timer 752af1dd7ffSMike Christie * for requeues and when it is finally sent to userspace. 753af1dd7ffSMike Christie */ 7540d44374cSMike Christie if (tcmu_cmd->cmd_id) 7550d44374cSMike Christie return 0; 7560d44374cSMike Christie 7570d44374cSMike Christie cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 7580d44374cSMike Christie if (cmd_id < 0) { 7590d44374cSMike Christie pr_err("tcmu: Could not allocate cmd id.\n"); 7600d44374cSMike Christie return cmd_id; 7610d44374cSMike Christie } 7620d44374cSMike Christie tcmu_cmd->cmd_id = cmd_id; 7630d44374cSMike Christie 7640d44374cSMike Christie if (!tmo) 765af1dd7ffSMike Christie tmo = TCMU_TIME_OUT; 766af1dd7ffSMike Christie 767af1dd7ffSMike Christie pr_debug("allocated cmd %u for dev %s tmo %lu\n", tcmu_cmd->cmd_id, 768af1dd7ffSMike Christie udev->name, tmo / MSEC_PER_SEC); 7690d44374cSMike Christie 7700d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 7710d44374cSMike Christie mod_timer(&udev->timeout, tcmu_cmd->deadline); 7720d44374cSMike Christie return 0; 7730d44374cSMike Christie } 7740d44374cSMike Christie 775af1dd7ffSMike Christie static int add_to_cmdr_queue(struct tcmu_cmd *tcmu_cmd) 776af1dd7ffSMike Christie { 777af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 778af1dd7ffSMike Christie int ret; 779af1dd7ffSMike Christie 780af1dd7ffSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd); 781af1dd7ffSMike Christie if (ret) 782af1dd7ffSMike Christie return ret; 783af1dd7ffSMike Christie 784af1dd7ffSMike Christie list_add_tail(&tcmu_cmd->cmdr_queue_entry, &udev->cmdr_queue); 785af1dd7ffSMike Christie pr_debug("adding cmd %u on dev %s to ring space wait queue\n", 786af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 787af1dd7ffSMike Christie return 0; 788af1dd7ffSMike Christie } 789af1dd7ffSMike Christie 7906fd0ce79SMike Christie /** 7916fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 7926fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 7936fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 7946fd0ce79SMike Christie * 7956fd0ce79SMike Christie * Returns: 7966fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 7976fd0ce79SMike Christie * 0 success 798af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 7996fd0ce79SMike Christie */ 8006fd0ce79SMike Christie static sense_reason_t queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, int *scsi_err) 8017c9e7a6fSAndy Grover { 8027c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 8037c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 8047c9e7a6fSAndy Grover size_t base_command_size, command_size; 8057c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8067c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 8077c9e7a6fSAndy Grover struct iovec *iov; 808141685a3SXiubo Li int iov_cnt, ret; 8097c9e7a6fSAndy Grover uint32_t cmd_head; 8107c9e7a6fSAndy Grover uint64_t cdb_off; 811f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 812ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 8137c9e7a6fSAndy Grover 8146fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 8156fd0ce79SMike Christie 8166fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 8176fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 8186fd0ce79SMike Christie return -1; 8196fd0ce79SMike Christie } 8207c9e7a6fSAndy Grover 8217c9e7a6fSAndy Grover /* 8227c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 8237c9e7a6fSAndy Grover * also may be larger if the iov array is large. 8247c9e7a6fSAndy Grover * 825fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 826fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 827fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 828fe25cc34SXiubo Li * will only be used to do the checks. 829fe25cc34SXiubo Li * 830fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 831fe25cc34SXiubo Li * cmd area memories. 8327c9e7a6fSAndy Grover */ 833fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 834fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 8357c9e7a6fSAndy Grover 836af1dd7ffSMike Christie if (!list_empty(&udev->cmdr_queue)) 837af1dd7ffSMike Christie goto queue; 8387c9e7a6fSAndy Grover 8397c9e7a6fSAndy Grover mb = udev->mb_addr; 8407c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 841554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 842554617b2SAndy Grover data_length > udev->data_size) { 843554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 8443d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 8457c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 8466fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 8476fd0ce79SMike Christie return -1; 848554617b2SAndy Grover } 8497c9e7a6fSAndy Grover 850af1dd7ffSMike Christie if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 851810b8153SMike Christie /* 852810b8153SMike Christie * Don't leave commands partially setup because the unmap 853810b8153SMike Christie * thread might need the blocks to make forward progress. 854810b8153SMike Christie */ 855810b8153SMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 856810b8153SMike Christie tcmu_cmd_reset_dbi_cur(tcmu_cmd); 857af1dd7ffSMike Christie goto queue; 8587c9e7a6fSAndy Grover } 8597c9e7a6fSAndy Grover 860f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 861f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 862f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 863f56574a2SAndy Grover 8647c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 8650ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 8660ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 8670ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 8680ad46af8SAndy Grover entry->hdr.kflags = 0; 8690ad46af8SAndy Grover entry->hdr.uflags = 0; 8709d62bc0eSXiubo Li tcmu_flush_dcache_range(entry, sizeof(*entry)); 8717c9e7a6fSAndy Grover 8727c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 8739d62bc0eSXiubo Li tcmu_flush_dcache_range(mb, sizeof(*mb)); 8747c9e7a6fSAndy Grover 8757c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 8767c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 8777c9e7a6fSAndy Grover } 8787c9e7a6fSAndy Grover 8797c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 880b3743c71SXiubo Li memset(entry, 0, command_size); 8810ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 8827c9e7a6fSAndy Grover 8833d9b9555SAndy Grover /* Handle allocating space from the data area */ 884b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 8857c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 886f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 887e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 888e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 8891a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 890b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 891b6df4b79SXiubo Li copy_to_data_area); 8927c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 8937c9e7a6fSAndy Grover 894e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 895e4648b01SIlias Tsitsimpis iov_cnt = 0; 896b3743c71SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 897ab22d260SXiubo Li iov++; 8981a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, 8991a1fc0b8SMike Christie se_cmd->t_bidi_data_nents, &iov, &iov_cnt, 9001a1fc0b8SMike Christie false); 901ab22d260SXiubo Li } 902b3743c71SXiubo Li entry->req.iov_bidi_cnt = iov_cnt; 90326418649SSheng Yang 9040d44374cSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd); 9050d44374cSMike Christie if (ret) { 9060d44374cSMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 90797488c73SDan Carpenter mutex_unlock(&udev->cmdr_lock); 9086fd0ce79SMike Christie 9096fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 9106fd0ce79SMike Christie return -1; 9110d44374cSMike Christie } 9120d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 9130d44374cSMike Christie 914fe25cc34SXiubo Li /* 915fe25cc34SXiubo Li * Recalaulate the command's base size and size according 916fe25cc34SXiubo Li * to the actual needs 917fe25cc34SXiubo Li */ 918fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 919fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 920fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 921fe25cc34SXiubo Li 922fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 923fe25cc34SXiubo Li 9247c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 9257c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 9267c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 9277c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 9287c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 9297c9e7a6fSAndy Grover 9307c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 9317c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 9327c9e7a6fSAndy Grover 9337c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 9347c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 9357c9e7a6fSAndy Grover 9366fd0ce79SMike Christie return 0; 937af1dd7ffSMike Christie 938af1dd7ffSMike Christie queue: 939af1dd7ffSMike Christie if (add_to_cmdr_queue(tcmu_cmd)) { 940af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 941af1dd7ffSMike Christie return -1; 942af1dd7ffSMike Christie } 943af1dd7ffSMike Christie 944af1dd7ffSMike Christie return 1; 9457c9e7a6fSAndy Grover } 9467c9e7a6fSAndy Grover 94702eb924fSAndy Grover static sense_reason_t 94802eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 9497c9e7a6fSAndy Grover { 950af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 951af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 9527c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 9536fd0ce79SMike Christie sense_reason_t scsi_ret; 954af1dd7ffSMike Christie int ret; 9557c9e7a6fSAndy Grover 9567c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 9577c9e7a6fSAndy Grover if (!tcmu_cmd) 95802eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 9597c9e7a6fSAndy Grover 960af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 961af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 962af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 963af1dd7ffSMike Christie if (ret < 0) 964141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 9656fd0ce79SMike Christie return scsi_ret; 9667c9e7a6fSAndy Grover } 9677c9e7a6fSAndy Grover 9687c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 9697c9e7a6fSAndy Grover { 9707c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 9717c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 9727c9e7a6fSAndy Grover 973b25c7863SSheng Yang /* 974b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 9753d9b9555SAndy Grover * data area space and free cmd 976b25c7863SSheng Yang */ 977141685a3SXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 978141685a3SXiubo Li goto out; 979b25c7863SSheng Yang 980141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 9817c9e7a6fSAndy Grover 9820ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 9830ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 9840ad46af8SAndy Grover cmd->se_cmd); 985ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 986ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 987406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 988e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 98926418649SSheng Yang /* Get Data-In buffer before clean up */ 990a5d68ba8SXiubo Li gather_data_area(udev, cmd, true); 991e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 992a5d68ba8SXiubo Li gather_data_area(udev, cmd, false); 9937c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 994141685a3SXiubo Li /* TODO: */ 9952bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 9962bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 9972bc396a2SIlias Tsitsimpis se_cmd->data_direction); 9987c9e7a6fSAndy Grover } 9997c9e7a6fSAndy Grover 10007c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 10017c9e7a6fSAndy Grover 1002141685a3SXiubo Li out: 1003141685a3SXiubo Li cmd->se_cmd = NULL; 1004b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1005141685a3SXiubo Li tcmu_free_cmd(cmd); 10067c9e7a6fSAndy Grover } 10077c9e7a6fSAndy Grover 10087c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 10097c9e7a6fSAndy Grover { 10107c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 10117c9e7a6fSAndy Grover int handled = 0; 10127c9e7a6fSAndy Grover 10137c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 10147c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 10157c9e7a6fSAndy Grover return 0; 10167c9e7a6fSAndy Grover } 10177c9e7a6fSAndy Grover 10187c9e7a6fSAndy Grover mb = udev->mb_addr; 10197c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10207c9e7a6fSAndy Grover 10216aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 10227c9e7a6fSAndy Grover 10237c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 10247c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 10257c9e7a6fSAndy Grover 10267c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 10277c9e7a6fSAndy Grover 10280ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 10290ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 10300ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 10310ad46af8SAndy Grover udev->cmdr_size); 10327c9e7a6fSAndy Grover continue; 10337c9e7a6fSAndy Grover } 10340ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 10357c9e7a6fSAndy Grover 1036d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 10377c9e7a6fSAndy Grover if (!cmd) { 10387c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 10397c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 10407c9e7a6fSAndy Grover break; 10417c9e7a6fSAndy Grover } 10427c9e7a6fSAndy Grover 10437c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 10447c9e7a6fSAndy Grover 10450ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 10460ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 10470ad46af8SAndy Grover udev->cmdr_size); 10487c9e7a6fSAndy Grover 10497c9e7a6fSAndy Grover handled++; 10507c9e7a6fSAndy Grover } 10517c9e7a6fSAndy Grover 1052af1dd7ffSMike Christie if (mb->cmd_tail == mb->cmd_head && list_empty(&udev->cmdr_queue)) { 1053af1dd7ffSMike Christie del_timer(&udev->timeout); 1054af1dd7ffSMike Christie /* 1055af1dd7ffSMike Christie * not more pending or waiting commands so try to reclaim 1056af1dd7ffSMike Christie * blocks if needed. 1057af1dd7ffSMike Christie */ 1058af1dd7ffSMike Christie if (atomic_read(&global_db_count) > TCMU_GLOBAL_MAX_BLOCKS) 1059af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1060af1dd7ffSMike Christie } 10617c9e7a6fSAndy Grover 10627c9e7a6fSAndy Grover return handled; 10637c9e7a6fSAndy Grover } 10647c9e7a6fSAndy Grover 10657c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 10667c9e7a6fSAndy Grover { 10677c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 1068af1dd7ffSMike Christie struct tcmu_dev *udev = cmd->tcmu_dev; 1069af1dd7ffSMike Christie u8 scsi_status; 1070af1dd7ffSMike Christie struct se_cmd *se_cmd; 1071af1dd7ffSMike Christie bool is_running; 10727c9e7a6fSAndy Grover 10737c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 10747c9e7a6fSAndy Grover return 0; 10757c9e7a6fSAndy Grover 1076611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 10777c9e7a6fSAndy Grover return 0; 10787c9e7a6fSAndy Grover 1079af1dd7ffSMike Christie is_running = list_empty(&cmd->cmdr_queue_entry); 1080af1dd7ffSMike Christie pr_debug("Timing out cmd %u on dev %s that is %s.\n", 1081af1dd7ffSMike Christie id, udev->name, is_running ? "inflight" : "queued"); 1082af1dd7ffSMike Christie 1083af1dd7ffSMike Christie se_cmd = cmd->se_cmd; 10847c9e7a6fSAndy Grover cmd->se_cmd = NULL; 10857c9e7a6fSAndy Grover 1086af1dd7ffSMike Christie if (is_running) { 1087af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 1088af1dd7ffSMike Christie /* 1089af1dd7ffSMike Christie * target_complete_cmd will translate this to LUN COMM FAILURE 1090af1dd7ffSMike Christie */ 1091af1dd7ffSMike Christie scsi_status = SAM_STAT_CHECK_CONDITION; 1092af1dd7ffSMike Christie } else { 1093af1dd7ffSMike Christie list_del_init(&cmd->cmdr_queue_entry); 1094af1dd7ffSMike Christie 1095af1dd7ffSMike Christie idr_remove(&udev->commands, id); 1096af1dd7ffSMike Christie tcmu_free_cmd(cmd); 1097af1dd7ffSMike Christie scsi_status = SAM_STAT_TASK_SET_FULL; 1098af1dd7ffSMike Christie } 1099af1dd7ffSMike Christie target_complete_cmd(se_cmd, scsi_status); 11007c9e7a6fSAndy Grover return 0; 11017c9e7a6fSAndy Grover } 11027c9e7a6fSAndy Grover 1103e99e88a9SKees Cook static void tcmu_device_timedout(struct timer_list *t) 11047c9e7a6fSAndy Grover { 1105e99e88a9SKees Cook struct tcmu_dev *udev = from_timer(udev, t, timeout); 11067c9e7a6fSAndy Grover 1107488ebe4cSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 1108488ebe4cSMike Christie 1109488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1110488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1111488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1112488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 11137c9e7a6fSAndy Grover 1114af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 11157c9e7a6fSAndy Grover } 11167c9e7a6fSAndy Grover 11177c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 11187c9e7a6fSAndy Grover { 11197c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 11207c9e7a6fSAndy Grover 11217c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 11227c9e7a6fSAndy Grover if (!tcmu_hba) 11237c9e7a6fSAndy Grover return -ENOMEM; 11247c9e7a6fSAndy Grover 11257c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 11267c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 11277c9e7a6fSAndy Grover 11287c9e7a6fSAndy Grover return 0; 11297c9e7a6fSAndy Grover } 11307c9e7a6fSAndy Grover 11317c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 11327c9e7a6fSAndy Grover { 11337c9e7a6fSAndy Grover kfree(hba->hba_ptr); 11347c9e7a6fSAndy Grover hba->hba_ptr = NULL; 11357c9e7a6fSAndy Grover } 11367c9e7a6fSAndy Grover 11377c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 11387c9e7a6fSAndy Grover { 11397c9e7a6fSAndy Grover struct tcmu_dev *udev; 11407c9e7a6fSAndy Grover 11417c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 11427c9e7a6fSAndy Grover if (!udev) 11437c9e7a6fSAndy Grover return NULL; 1144f3cdbe39SMike Christie kref_init(&udev->kref); 11457c9e7a6fSAndy Grover 11467c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 11477c9e7a6fSAndy Grover if (!udev->name) { 11487c9e7a6fSAndy Grover kfree(udev); 11497c9e7a6fSAndy Grover return NULL; 11507c9e7a6fSAndy Grover } 11517c9e7a6fSAndy Grover 11527c9e7a6fSAndy Grover udev->hba = hba; 1153af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 11547c9e7a6fSAndy Grover 1155b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 11567c9e7a6fSAndy Grover 1157488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1158af1dd7ffSMike Christie INIT_LIST_HEAD(&udev->cmdr_queue); 11597c9e7a6fSAndy Grover idr_init(&udev->commands); 11607c9e7a6fSAndy Grover 1161e99e88a9SKees Cook timer_setup(&udev->timeout, tcmu_device_timedout, 0); 11627c9e7a6fSAndy Grover 1163b3af66e2SMike Christie init_waitqueue_head(&udev->nl_cmd_wq); 1164b3af66e2SMike Christie spin_lock_init(&udev->nl_cmd_lock); 1165b3af66e2SMike Christie 1166c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1167c22adc0bSXiubo Li 11687c9e7a6fSAndy Grover return &udev->se_dev; 11697c9e7a6fSAndy Grover } 11707c9e7a6fSAndy Grover 1171af1dd7ffSMike Christie static bool run_cmdr_queue(struct tcmu_dev *udev) 1172af1dd7ffSMike Christie { 1173af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1174af1dd7ffSMike Christie LIST_HEAD(cmds); 1175af1dd7ffSMike Christie bool drained = true; 1176af1dd7ffSMike Christie sense_reason_t scsi_ret; 1177af1dd7ffSMike Christie int ret; 1178af1dd7ffSMike Christie 1179af1dd7ffSMike Christie if (list_empty(&udev->cmdr_queue)) 1180af1dd7ffSMike Christie return true; 1181af1dd7ffSMike Christie 1182af1dd7ffSMike Christie pr_debug("running %s's cmdr queue\n", udev->name); 1183af1dd7ffSMike Christie 1184af1dd7ffSMike Christie list_splice_init(&udev->cmdr_queue, &cmds); 1185af1dd7ffSMike Christie 1186af1dd7ffSMike Christie list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, cmdr_queue_entry) { 1187af1dd7ffSMike Christie list_del_init(&tcmu_cmd->cmdr_queue_entry); 1188af1dd7ffSMike Christie 1189af1dd7ffSMike Christie pr_debug("removing cmd %u on dev %s from queue\n", 1190af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 1191af1dd7ffSMike Christie 1192af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1193af1dd7ffSMike Christie if (ret < 0) { 1194af1dd7ffSMike Christie pr_debug("cmd %u on dev %s failed with %u\n", 1195af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name, scsi_ret); 1196af1dd7ffSMike Christie 1197af1dd7ffSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1198af1dd7ffSMike Christie /* 1199af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1200af1dd7ffSMike Christie * drops it. 1201af1dd7ffSMike Christie */ 1202af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1203af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1204af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1205af1dd7ffSMike Christie } else if (ret > 0) { 1206af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1207af1dd7ffSMike Christie /* 1208af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1209af1dd7ffSMike Christie * the queue 1210af1dd7ffSMike Christie */ 1211af1dd7ffSMike Christie list_splice_tail(&cmds, &udev->cmdr_queue); 1212af1dd7ffSMike Christie drained = false; 1213af1dd7ffSMike Christie goto done; 1214af1dd7ffSMike Christie } 1215af1dd7ffSMike Christie } 1216af1dd7ffSMike Christie done: 1217af1dd7ffSMike Christie return drained; 1218af1dd7ffSMike Christie } 1219af1dd7ffSMike Christie 12207c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 12217c9e7a6fSAndy Grover { 1222af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 12237c9e7a6fSAndy Grover 1224af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1225af1dd7ffSMike Christie tcmu_handle_completions(udev); 1226af1dd7ffSMike Christie run_cmdr_queue(udev); 1227af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 12287c9e7a6fSAndy Grover 12297c9e7a6fSAndy Grover return 0; 12307c9e7a6fSAndy Grover } 12317c9e7a6fSAndy Grover 12327c9e7a6fSAndy Grover /* 12337c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 12347c9e7a6fSAndy Grover * and this stuff must come along. 12357c9e7a6fSAndy Grover */ 12367c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 12377c9e7a6fSAndy Grover { 12387c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 12397c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 12407c9e7a6fSAndy Grover 12417c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 12427c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 12437c9e7a6fSAndy Grover return -1; 12447c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 12457c9e7a6fSAndy Grover } 12467c9e7a6fSAndy Grover return -1; 12477c9e7a6fSAndy Grover } 12487c9e7a6fSAndy Grover 1249b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1250b6df4b79SXiubo Li { 1251b6df4b79SXiubo Li struct page *page; 1252b6df4b79SXiubo Li int ret; 1253b6df4b79SXiubo Li 1254b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1255b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1256b6df4b79SXiubo Li if (likely(page)) { 1257b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1258b6df4b79SXiubo Li return page; 1259b6df4b79SXiubo Li } 1260b6df4b79SXiubo Li 1261b6df4b79SXiubo Li /* 1262b6df4b79SXiubo Li * Normally it shouldn't be here: 1263b6df4b79SXiubo Li * Only when the userspace has touched the blocks which 1264b6df4b79SXiubo Li * are out of the tcmu_cmd's data iov[], and will return 1265b6df4b79SXiubo Li * one zeroed page. 1266b6df4b79SXiubo Li */ 1267b6df4b79SXiubo Li pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); 1268b6df4b79SXiubo Li pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); 1269b6df4b79SXiubo Li 1270b6df4b79SXiubo Li if (dbi >= udev->dbi_thresh) { 1271b6df4b79SXiubo Li /* Extern the udev->dbi_thresh to dbi + 1 */ 1272b6df4b79SXiubo Li udev->dbi_thresh = dbi + 1; 1273b6df4b79SXiubo Li udev->dbi_max = dbi; 1274b6df4b79SXiubo Li } 1275b6df4b79SXiubo Li 1276b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 1277b6df4b79SXiubo Li if (!page) { 1278b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL | __GFP_ZERO); 1279b6df4b79SXiubo Li if (!page) { 1280b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1281b6df4b79SXiubo Li return NULL; 1282b6df4b79SXiubo Li } 1283b6df4b79SXiubo Li 1284b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 1285b6df4b79SXiubo Li if (ret) { 1286b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1287b6df4b79SXiubo Li __free_page(page); 1288b6df4b79SXiubo Li return NULL; 1289b6df4b79SXiubo Li } 1290b6df4b79SXiubo Li 1291b6df4b79SXiubo Li /* 1292b6df4b79SXiubo Li * Since this case is rare in page fault routine, here we 1293b6df4b79SXiubo Li * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS 1294b6df4b79SXiubo Li * to reduce possible page fault call trace. 1295b6df4b79SXiubo Li */ 1296b6df4b79SXiubo Li atomic_inc(&global_db_count); 1297b6df4b79SXiubo Li } 1298b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1299b6df4b79SXiubo Li 1300b6df4b79SXiubo Li return page; 1301b6df4b79SXiubo Li } 1302b6df4b79SXiubo Li 130311bac800SDave Jiang static int tcmu_vma_fault(struct vm_fault *vmf) 13047c9e7a6fSAndy Grover { 130511bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 13067c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 13077c9e7a6fSAndy Grover struct page *page; 13087c9e7a6fSAndy Grover unsigned long offset; 13097c9e7a6fSAndy Grover void *addr; 13107c9e7a6fSAndy Grover 131111bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 13127c9e7a6fSAndy Grover if (mi < 0) 13137c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 13147c9e7a6fSAndy Grover 13157c9e7a6fSAndy Grover /* 13167c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 13177c9e7a6fSAndy Grover * to use mem[N]. 13187c9e7a6fSAndy Grover */ 13197c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 13207c9e7a6fSAndy Grover 1321141685a3SXiubo Li if (offset < udev->data_off) { 1322141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 13237c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 13247c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1325141685a3SXiubo Li } else { 1326141685a3SXiubo Li uint32_t dbi; 1327141685a3SXiubo Li 1328b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1329141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1330b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1331b6df4b79SXiubo Li if (!page) 1332141685a3SXiubo Li return VM_FAULT_NOPAGE; 1333141685a3SXiubo Li } 1334141685a3SXiubo Li 13357c9e7a6fSAndy Grover get_page(page); 13367c9e7a6fSAndy Grover vmf->page = page; 13377c9e7a6fSAndy Grover return 0; 13387c9e7a6fSAndy Grover } 13397c9e7a6fSAndy Grover 13407c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 13417c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 13427c9e7a6fSAndy Grover }; 13437c9e7a6fSAndy Grover 13447c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 13457c9e7a6fSAndy Grover { 13467c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 13477c9e7a6fSAndy Grover 13487c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 13497c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 13507c9e7a6fSAndy Grover 13517c9e7a6fSAndy Grover vma->vm_private_data = udev; 13527c9e7a6fSAndy Grover 13537c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 13547c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 13557c9e7a6fSAndy Grover return -EINVAL; 13567c9e7a6fSAndy Grover 13577c9e7a6fSAndy Grover return 0; 13587c9e7a6fSAndy Grover } 13597c9e7a6fSAndy Grover 13607c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 13617c9e7a6fSAndy Grover { 13627c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 13637c9e7a6fSAndy Grover 13647c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 13657c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 13667c9e7a6fSAndy Grover return -EBUSY; 13677c9e7a6fSAndy Grover 1368b6df4b79SXiubo Li udev->inode = inode; 13699260695dSMike Christie kref_get(&udev->kref); 1370b6df4b79SXiubo Li 13717c9e7a6fSAndy Grover pr_debug("open\n"); 13727c9e7a6fSAndy Grover 13737c9e7a6fSAndy Grover return 0; 13747c9e7a6fSAndy Grover } 13757c9e7a6fSAndy Grover 1376f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1377f3cdbe39SMike Christie { 1378f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1379f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1380f3cdbe39SMike Christie 1381f3cdbe39SMike Christie kfree(udev->uio_info.name); 1382f3cdbe39SMike Christie kfree(udev->name); 1383f3cdbe39SMike Christie kfree(udev); 1384f3cdbe39SMike Christie } 1385f3cdbe39SMike Christie 1386c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1387c22adc0bSXiubo Li { 1388c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1389c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1390c22adc0bSXiubo Li return 0; 1391c22adc0bSXiubo Li } 1392c22adc0bSXiubo Li return -EINVAL; 1393c22adc0bSXiubo Li } 1394c22adc0bSXiubo Li 1395bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1396bf99ec13SMike Christie int start, int end) 1397c22adc0bSXiubo Li { 1398c22adc0bSXiubo Li int i; 1399c22adc0bSXiubo Li struct page *page; 1400c22adc0bSXiubo Li 1401bf99ec13SMike Christie for (i = start; i < end; i++) { 1402bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1403c22adc0bSXiubo Li if (page) { 1404c22adc0bSXiubo Li __free_page(page); 1405c22adc0bSXiubo Li atomic_dec(&global_db_count); 1406c22adc0bSXiubo Li } 1407c22adc0bSXiubo Li } 1408c22adc0bSXiubo Li } 1409c22adc0bSXiubo Li 1410f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1411f3cdbe39SMike Christie { 1412f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1413f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1414c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1415c22adc0bSXiubo Li bool all_expired = true; 1416c22adc0bSXiubo Li int i; 1417c22adc0bSXiubo Li 1418c22adc0bSXiubo Li vfree(udev->mb_addr); 1419c22adc0bSXiubo Li udev->mb_addr = NULL; 1420c22adc0bSXiubo Li 1421488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1422488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1423488ebe4cSMike Christie list_del(&udev->timedout_entry); 1424488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1425488ebe4cSMike Christie 1426c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 14276fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1428c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1429c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1430c22adc0bSXiubo Li all_expired = false; 1431c22adc0bSXiubo Li } 1432c22adc0bSXiubo Li idr_destroy(&udev->commands); 1433c22adc0bSXiubo Li WARN_ON(!all_expired); 1434c22adc0bSXiubo Li 1435bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 1436bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1437f3cdbe39SMike Christie 1438f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1439f3cdbe39SMike Christie } 1440f3cdbe39SMike Christie 14417c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 14427c9e7a6fSAndy Grover { 14437c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14447c9e7a6fSAndy Grover 14457c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 14467c9e7a6fSAndy Grover 14477c9e7a6fSAndy Grover pr_debug("close\n"); 14489260695dSMike Christie /* release ref from open */ 1449f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 14507c9e7a6fSAndy Grover return 0; 14517c9e7a6fSAndy Grover } 14527c9e7a6fSAndy Grover 1453b3af66e2SMike Christie static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1454b3af66e2SMike Christie { 1455b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1456b3af66e2SMike Christie 1457b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1458b3af66e2SMike Christie return; 1459b849b456SKenjiro Nakayama 1460b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1461b849b456SKenjiro Nakayama return; 1462b849b456SKenjiro Nakayama 1463b3af66e2SMike Christie relock: 1464b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 1465b3af66e2SMike Christie 1466b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 1467b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1468b3af66e2SMike Christie pr_debug("sleeping for open nl cmd\n"); 1469b3af66e2SMike Christie wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); 1470b3af66e2SMike Christie goto relock; 1471b3af66e2SMike Christie } 1472b3af66e2SMike Christie 1473b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1474b3af66e2SMike Christie nl_cmd->cmd = cmd; 1475b3af66e2SMike Christie init_completion(&nl_cmd->complete); 1476b3af66e2SMike Christie 1477b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1478b3af66e2SMike Christie } 1479b3af66e2SMike Christie 1480b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1481b3af66e2SMike Christie { 1482b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1483b3af66e2SMike Christie int ret; 1484b3af66e2SMike Christie DEFINE_WAIT(__wait); 1485b3af66e2SMike Christie 1486b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1487b3af66e2SMike Christie return 0; 1488b3af66e2SMike Christie 1489b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1490b849b456SKenjiro Nakayama return 0; 1491b849b456SKenjiro Nakayama 1492b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1493b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1494b3af66e2SMike Christie 1495b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 1496b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1497b3af66e2SMike Christie ret = nl_cmd->status; 1498b3af66e2SMike Christie nl_cmd->status = 0; 1499b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1500b3af66e2SMike Christie 1501b3af66e2SMike Christie wake_up_all(&udev->nl_cmd_wq); 1502b3af66e2SMike Christie 1503b3af66e2SMike Christie return ret;; 1504b3af66e2SMike Christie } 1505b3af66e2SMike Christie 1506b3af66e2SMike Christie static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, 1507b3af66e2SMike Christie int reconfig_attr, const void *reconfig_data) 15087c9e7a6fSAndy Grover { 15097c9e7a6fSAndy Grover struct sk_buff *skb; 15107c9e7a6fSAndy Grover void *msg_header; 15116e14eab9SNicholas Bellinger int ret = -ENOMEM; 15127c9e7a6fSAndy Grover 15137c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 15147c9e7a6fSAndy Grover if (!skb) 15156e14eab9SNicholas Bellinger return ret; 15167c9e7a6fSAndy Grover 15177c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 15186e14eab9SNicholas Bellinger if (!msg_header) 15196e14eab9SNicholas Bellinger goto free_skb; 15207c9e7a6fSAndy Grover 1521b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 15226e14eab9SNicholas Bellinger if (ret < 0) 15236e14eab9SNicholas Bellinger goto free_skb; 15247c9e7a6fSAndy Grover 1525b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1526b3af66e2SMike Christie if (ret < 0) 1527b3af66e2SMike Christie goto free_skb; 1528b3af66e2SMike Christie 1529b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 15306e14eab9SNicholas Bellinger if (ret < 0) 15316e14eab9SNicholas Bellinger goto free_skb; 15327c9e7a6fSAndy Grover 15332d76443eSMike Christie if (cmd == TCMU_CMD_RECONFIG_DEVICE) { 15342d76443eSMike Christie switch (reconfig_attr) { 15352d76443eSMike Christie case TCMU_ATTR_DEV_CFG: 15362d76443eSMike Christie ret = nla_put_string(skb, reconfig_attr, reconfig_data); 15372d76443eSMike Christie break; 15382d76443eSMike Christie case TCMU_ATTR_DEV_SIZE: 15392d76443eSMike Christie ret = nla_put_u64_64bit(skb, reconfig_attr, 15402d76443eSMike Christie *((u64 *)reconfig_data), 15412d76443eSMike Christie TCMU_ATTR_PAD); 15422d76443eSMike Christie break; 15432d76443eSMike Christie case TCMU_ATTR_WRITECACHE: 15442d76443eSMike Christie ret = nla_put_u8(skb, reconfig_attr, 15452d76443eSMike Christie *((u8 *)reconfig_data)); 15462d76443eSMike Christie break; 15472d76443eSMike Christie default: 15482d76443eSMike Christie BUG(); 15492d76443eSMike Christie } 15502d76443eSMike Christie 15518a45885cSBryant G. Ly if (ret < 0) 15528a45885cSBryant G. Ly goto free_skb; 15532d76443eSMike Christie } 15548a45885cSBryant G. Ly 1555053c095aSJohannes Berg genlmsg_end(skb, msg_header); 15567c9e7a6fSAndy Grover 1557b3af66e2SMike Christie tcmu_init_genl_cmd_reply(udev, cmd); 1558b3af66e2SMike Christie 155920c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 15607c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 15617c9e7a6fSAndy Grover /* We don't care if no one is listening */ 15627c9e7a6fSAndy Grover if (ret == -ESRCH) 15637c9e7a6fSAndy Grover ret = 0; 1564b3af66e2SMike Christie if (!ret) 1565b3af66e2SMike Christie ret = tcmu_wait_genl_cmd_reply(udev); 15667c9e7a6fSAndy Grover 15677c9e7a6fSAndy Grover return ret; 15686e14eab9SNicholas Bellinger free_skb: 15696e14eab9SNicholas Bellinger nlmsg_free(skb); 15706e14eab9SNicholas Bellinger return ret; 15717c9e7a6fSAndy Grover } 15727c9e7a6fSAndy Grover 1573de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 15747c9e7a6fSAndy Grover { 15757c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 15767c9e7a6fSAndy Grover struct uio_info *info; 1577de8c5221SBryant G. Ly size_t size, used; 15787c9e7a6fSAndy Grover char *str; 15797c9e7a6fSAndy Grover 15807c9e7a6fSAndy Grover info = &udev->uio_info; 15817c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 15827c9e7a6fSAndy Grover udev->dev_config); 15837c9e7a6fSAndy Grover size += 1; /* for \0 */ 15847c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 15857c9e7a6fSAndy Grover if (!str) 15867c9e7a6fSAndy Grover return -ENOMEM; 15877c9e7a6fSAndy Grover 15887c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 15897c9e7a6fSAndy Grover if (udev->dev_config[0]) 15907c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 15917c9e7a6fSAndy Grover 1592ededd039SBryant G. Ly /* If the old string exists, free it */ 1593ededd039SBryant G. Ly kfree(info->name); 15947c9e7a6fSAndy Grover info->name = str; 15957c9e7a6fSAndy Grover 1596de8c5221SBryant G. Ly return 0; 1597de8c5221SBryant G. Ly } 1598de8c5221SBryant G. Ly 1599de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 1600de8c5221SBryant G. Ly { 1601de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 1602de8c5221SBryant G. Ly struct uio_info *info; 1603de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 1604de8c5221SBryant G. Ly int ret = 0; 1605de8c5221SBryant G. Ly 1606de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1607de8c5221SBryant G. Ly if (ret) 1608de8c5221SBryant G. Ly return ret; 1609de8c5221SBryant G. Ly 1610de8c5221SBryant G. Ly info = &udev->uio_info; 1611de8c5221SBryant G. Ly 1612141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 16137c9e7a6fSAndy Grover if (!udev->mb_addr) { 16147c9e7a6fSAndy Grover ret = -ENOMEM; 16157c9e7a6fSAndy Grover goto err_vzalloc; 16167c9e7a6fSAndy Grover } 16177c9e7a6fSAndy Grover 16187c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 16197c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 16207c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 1621141685a3SXiubo Li udev->data_size = DATA_SIZE; 1622b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 16237c9e7a6fSAndy Grover 1624141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 16257c9e7a6fSAndy Grover mb = udev->mb_addr; 16260ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 162732c76de3SSheng Yang mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; 16287c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 16297c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 16307c9e7a6fSAndy Grover 16317c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 16327c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 163326418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 16347c9e7a6fSAndy Grover 1635ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 16367c9e7a6fSAndy Grover 16377c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 16380633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 16397c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 1640141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 16417c9e7a6fSAndy Grover 16427c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 16437c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 16447c9e7a6fSAndy Grover 16457c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 16467c9e7a6fSAndy Grover info->open = tcmu_open; 16477c9e7a6fSAndy Grover info->release = tcmu_release; 16487c9e7a6fSAndy Grover 16497c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 16507c9e7a6fSAndy Grover if (ret) 16517c9e7a6fSAndy Grover goto err_register; 16527c9e7a6fSAndy Grover 165381ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 165481ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 16557c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 165681ee28deSSheng Yang /* Other attributes can be configured in userspace */ 16573abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 16587c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 16599a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 16609a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 16617c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 16627c9e7a6fSAndy Grover 1663b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 1664b849b456SKenjiro Nakayama * module scope setting. 1665b849b456SKenjiro Nakayama */ 1666b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 1667b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 1668b849b456SKenjiro Nakayama 1669f3cdbe39SMike Christie /* 1670f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1671f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1672f3cdbe39SMike Christie */ 1673f3cdbe39SMike Christie kref_get(&udev->kref); 1674f3cdbe39SMike Christie 1675b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); 16767c9e7a6fSAndy Grover if (ret) 16777c9e7a6fSAndy Grover goto err_netlink; 16787c9e7a6fSAndy Grover 1679b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1680b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1681b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1682b6df4b79SXiubo Li 16837c9e7a6fSAndy Grover return 0; 16847c9e7a6fSAndy Grover 16857c9e7a6fSAndy Grover err_netlink: 1686f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 16877c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 16887c9e7a6fSAndy Grover err_register: 16897c9e7a6fSAndy Grover vfree(udev->mb_addr); 1690c22adc0bSXiubo Li udev->mb_addr = NULL; 16917c9e7a6fSAndy Grover err_vzalloc: 16927c9e7a6fSAndy Grover kfree(info->name); 1693f3cdbe39SMike Christie info->name = NULL; 16947c9e7a6fSAndy Grover 16957c9e7a6fSAndy Grover return ret; 16967c9e7a6fSAndy Grover } 16977c9e7a6fSAndy Grover 1698972c7f16SMike Christie static bool tcmu_dev_configured(struct tcmu_dev *udev) 1699972c7f16SMike Christie { 1700972c7f16SMike Christie return udev->uio_info.uio_dev ? true : false; 1701972c7f16SMike Christie } 1702972c7f16SMike Christie 17037c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 17047c9e7a6fSAndy Grover { 17057c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 170692634706SMike Christie 170792634706SMike Christie /* release ref from init */ 170892634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 170992634706SMike Christie } 171092634706SMike Christie 171192634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 171292634706SMike Christie { 171392634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 17147c9e7a6fSAndy Grover 17157c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 17167c9e7a6fSAndy Grover 1717b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1718b6df4b79SXiubo Li list_del(&udev->node); 1719b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1720b6df4b79SXiubo Li 1721b3af66e2SMike Christie tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); 17227c9e7a6fSAndy Grover 17237c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 17249260695dSMike Christie 17259260695dSMike Christie /* release ref from configure */ 17269260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 17277c9e7a6fSAndy Grover } 17287c9e7a6fSAndy Grover 17297c9e7a6fSAndy Grover enum { 17303abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 1731b849b456SKenjiro Nakayama Opt_nl_reply_supported, Opt_err, 17327c9e7a6fSAndy Grover }; 17337c9e7a6fSAndy Grover 17347c9e7a6fSAndy Grover static match_table_t tokens = { 17357c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 17367c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 17379c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 17383abaa2bfSMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%u"}, 1739b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 17407c9e7a6fSAndy Grover {Opt_err, NULL} 17417c9e7a6fSAndy Grover }; 17427c9e7a6fSAndy Grover 17433abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 17443abaa2bfSMike Christie { 17453abaa2bfSMike Christie unsigned long tmp_ul; 17463abaa2bfSMike Christie char *arg_p; 17473abaa2bfSMike Christie int ret; 17483abaa2bfSMike Christie 17493abaa2bfSMike Christie arg_p = match_strdup(arg); 17503abaa2bfSMike Christie if (!arg_p) 17513abaa2bfSMike Christie return -ENOMEM; 17523abaa2bfSMike Christie 17533abaa2bfSMike Christie ret = kstrtoul(arg_p, 0, &tmp_ul); 17543abaa2bfSMike Christie kfree(arg_p); 17553abaa2bfSMike Christie if (ret < 0) { 17563abaa2bfSMike Christie pr_err("kstrtoul() failed for dev attrib\n"); 17573abaa2bfSMike Christie return ret; 17583abaa2bfSMike Christie } 17593abaa2bfSMike Christie if (!tmp_ul) { 17603abaa2bfSMike Christie pr_err("dev attrib must be nonzero\n"); 17613abaa2bfSMike Christie return -EINVAL; 17623abaa2bfSMike Christie } 17633abaa2bfSMike Christie *dev_attrib = tmp_ul; 17643abaa2bfSMike Christie return 0; 17653abaa2bfSMike Christie } 17663abaa2bfSMike Christie 17677c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 17687c9e7a6fSAndy Grover const char *page, ssize_t count) 17697c9e7a6fSAndy Grover { 17707c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 17717c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 17727c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 17737c9e7a6fSAndy Grover int ret = 0, token; 17747c9e7a6fSAndy Grover 17757c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 17767c9e7a6fSAndy Grover if (!opts) 17777c9e7a6fSAndy Grover return -ENOMEM; 17787c9e7a6fSAndy Grover 17797c9e7a6fSAndy Grover orig = opts; 17807c9e7a6fSAndy Grover 17817c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 17827c9e7a6fSAndy Grover if (!*ptr) 17837c9e7a6fSAndy Grover continue; 17847c9e7a6fSAndy Grover 17857c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 17867c9e7a6fSAndy Grover switch (token) { 17877c9e7a6fSAndy Grover case Opt_dev_config: 17887c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 17897c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 17907c9e7a6fSAndy Grover ret = -EINVAL; 17917c9e7a6fSAndy Grover break; 17927c9e7a6fSAndy Grover } 17937c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 17947c9e7a6fSAndy Grover break; 17957c9e7a6fSAndy Grover case Opt_dev_size: 17967c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 17977c9e7a6fSAndy Grover if (!arg_p) { 17987c9e7a6fSAndy Grover ret = -ENOMEM; 17997c9e7a6fSAndy Grover break; 18007c9e7a6fSAndy Grover } 18017c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 18027c9e7a6fSAndy Grover kfree(arg_p); 18037c9e7a6fSAndy Grover if (ret < 0) 18047c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 18057c9e7a6fSAndy Grover break; 18069c1cd1b6SAndy Grover case Opt_hw_block_size: 18073abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 18083abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 18099c1cd1b6SAndy Grover break; 18103abaa2bfSMike Christie case Opt_hw_max_sectors: 18113abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 18123abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 18139c1cd1b6SAndy Grover break; 1814b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 1815b849b456SKenjiro Nakayama arg_p = match_strdup(&args[0]); 1816b849b456SKenjiro Nakayama if (!arg_p) { 1817b849b456SKenjiro Nakayama ret = -ENOMEM; 1818b849b456SKenjiro Nakayama break; 1819b849b456SKenjiro Nakayama } 182016b93277SDan Carpenter ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported); 1821b849b456SKenjiro Nakayama kfree(arg_p); 1822b849b456SKenjiro Nakayama if (ret < 0) 182316b93277SDan Carpenter pr_err("kstrtoint() failed for nl_reply_supported=\n"); 1824b849b456SKenjiro Nakayama break; 18257c9e7a6fSAndy Grover default: 18267c9e7a6fSAndy Grover break; 18277c9e7a6fSAndy Grover } 18282579325cSMike Christie 18292579325cSMike Christie if (ret) 18302579325cSMike Christie break; 18317c9e7a6fSAndy Grover } 18327c9e7a6fSAndy Grover 18337c9e7a6fSAndy Grover kfree(orig); 18347c9e7a6fSAndy Grover return (!ret) ? count : ret; 18357c9e7a6fSAndy Grover } 18367c9e7a6fSAndy Grover 18377c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 18387c9e7a6fSAndy Grover { 18397c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 18407c9e7a6fSAndy Grover ssize_t bl = 0; 18417c9e7a6fSAndy Grover 18427c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 18437c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 18447d7a7435SNicholas Bellinger bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 18457c9e7a6fSAndy Grover 18467c9e7a6fSAndy Grover return bl; 18477c9e7a6fSAndy Grover } 18487c9e7a6fSAndy Grover 18497c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 18507c9e7a6fSAndy Grover { 18517c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 18527c9e7a6fSAndy Grover 18537c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 18547c9e7a6fSAndy Grover dev->dev_attrib.block_size); 18557c9e7a6fSAndy Grover } 18567c9e7a6fSAndy Grover 18577c9e7a6fSAndy Grover static sense_reason_t 18587c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 18597c9e7a6fSAndy Grover { 186002eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 18619c1cd1b6SAndy Grover } 18629c1cd1b6SAndy Grover 18637d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 18647d7a7435SNicholas Bellinger { 18657d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 18667d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 1867b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 18687d7a7435SNicholas Bellinger 18697d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 18707d7a7435SNicholas Bellinger } 18717d7a7435SNicholas Bellinger 18727d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 18737d7a7435SNicholas Bellinger size_t count) 18747d7a7435SNicholas Bellinger { 18757d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 18767d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 18777d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 18787d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 18797d7a7435SNicholas Bellinger u32 val; 18807d7a7435SNicholas Bellinger int ret; 18817d7a7435SNicholas Bellinger 18827d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 18837d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 18847d7a7435SNicholas Bellinger return -EINVAL; 18857d7a7435SNicholas Bellinger } 18867d7a7435SNicholas Bellinger 18877d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 18887d7a7435SNicholas Bellinger if (ret < 0) 18897d7a7435SNicholas Bellinger return ret; 18907d7a7435SNicholas Bellinger 18917d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 18927d7a7435SNicholas Bellinger return count; 18937d7a7435SNicholas Bellinger } 18947d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 18957d7a7435SNicholas Bellinger 18962d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 1897ee018252SBryant G. Ly { 1898ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1899ee018252SBryant G. Ly struct se_dev_attrib, da_group); 1900ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1901ee018252SBryant G. Ly 1902ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 1903ee018252SBryant G. Ly } 1904ee018252SBryant G. Ly 19052d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 1906ee018252SBryant G. Ly size_t count) 1907ee018252SBryant G. Ly { 1908ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1909ee018252SBryant G. Ly struct se_dev_attrib, da_group); 1910ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 19112d76443eSMike Christie int ret, len; 1912ee018252SBryant G. Ly 19132d76443eSMike Christie len = strlen(page); 19142d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 1915ee018252SBryant G. Ly return -EINVAL; 1916ee018252SBryant G. Ly 1917ee018252SBryant G. Ly /* Check if device has been configured before */ 1918ee018252SBryant G. Ly if (tcmu_dev_configured(udev)) { 1919b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 19202d76443eSMike Christie TCMU_ATTR_DEV_CFG, page); 1921ee018252SBryant G. Ly if (ret) { 1922ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 1923ee018252SBryant G. Ly return ret; 1924ee018252SBryant G. Ly } 1925de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 1926de8c5221SBryant G. Ly 1927de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1928de8c5221SBryant G. Ly if (ret) 1929de8c5221SBryant G. Ly return ret; 1930de8c5221SBryant G. Ly return count; 1931ee018252SBryant G. Ly } 19322d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 1933ee018252SBryant G. Ly 1934ee018252SBryant G. Ly return count; 1935ee018252SBryant G. Ly } 19362d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 1937ee018252SBryant G. Ly 1938801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 1939801fc54dSBryant G. Ly { 1940801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1941801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 1942801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1943801fc54dSBryant G. Ly 1944801fc54dSBryant G. Ly return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); 1945801fc54dSBryant G. Ly } 1946801fc54dSBryant G. Ly 1947801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 1948801fc54dSBryant G. Ly size_t count) 1949801fc54dSBryant G. Ly { 1950801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 1951801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 1952801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 19532d76443eSMike Christie u64 val; 1954801fc54dSBryant G. Ly int ret; 1955801fc54dSBryant G. Ly 19562d76443eSMike Christie ret = kstrtou64(page, 0, &val); 1957801fc54dSBryant G. Ly if (ret < 0) 1958801fc54dSBryant G. Ly return ret; 1959801fc54dSBryant G. Ly 1960801fc54dSBryant G. Ly /* Check if device has been configured before */ 1961801fc54dSBryant G. Ly if (tcmu_dev_configured(udev)) { 1962b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 19632d76443eSMike Christie TCMU_ATTR_DEV_SIZE, &val); 1964801fc54dSBryant G. Ly if (ret) { 1965801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 1966801fc54dSBryant G. Ly return ret; 1967801fc54dSBryant G. Ly } 1968801fc54dSBryant G. Ly } 19692d76443eSMike Christie udev->dev_size = val; 1970801fc54dSBryant G. Ly return count; 1971801fc54dSBryant G. Ly } 1972801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 1973801fc54dSBryant G. Ly 1974b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 1975b849b456SKenjiro Nakayama char *page) 1976b849b456SKenjiro Nakayama { 1977b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 1978b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 1979b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1980b849b456SKenjiro Nakayama 1981b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 1982b849b456SKenjiro Nakayama } 1983b849b456SKenjiro Nakayama 1984b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 1985b849b456SKenjiro Nakayama const char *page, size_t count) 1986b849b456SKenjiro Nakayama { 1987b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 1988b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 1989b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 1990b849b456SKenjiro Nakayama s8 val; 1991b849b456SKenjiro Nakayama int ret; 1992b849b456SKenjiro Nakayama 1993b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 1994b849b456SKenjiro Nakayama if (ret < 0) 1995b849b456SKenjiro Nakayama return ret; 1996b849b456SKenjiro Nakayama 1997b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 1998b849b456SKenjiro Nakayama return count; 1999b849b456SKenjiro Nakayama } 2000b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2001b849b456SKenjiro Nakayama 20029a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 20039a8bb606SBryant G. Ly char *page) 20049a8bb606SBryant G. Ly { 20059a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 20069a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 20079a8bb606SBryant G. Ly 20089a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 20099a8bb606SBryant G. Ly } 20109a8bb606SBryant G. Ly 20119a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 20129a8bb606SBryant G. Ly const char *page, size_t count) 20139a8bb606SBryant G. Ly { 20149a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 20159a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 20161068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 20172d76443eSMike Christie u8 val; 20189a8bb606SBryant G. Ly int ret; 20199a8bb606SBryant G. Ly 20202d76443eSMike Christie ret = kstrtou8(page, 0, &val); 20219a8bb606SBryant G. Ly if (ret < 0) 20229a8bb606SBryant G. Ly return ret; 20239a8bb606SBryant G. Ly 20241068be7bSBryant G. Ly /* Check if device has been configured before */ 20251068be7bSBryant G. Ly if (tcmu_dev_configured(udev)) { 2026b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 20272d76443eSMike Christie TCMU_ATTR_WRITECACHE, &val); 20281068be7bSBryant G. Ly if (ret) { 20291068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 20301068be7bSBryant G. Ly return ret; 20311068be7bSBryant G. Ly } 20321068be7bSBryant G. Ly } 20332d76443eSMike Christie 20342d76443eSMike Christie da->emulate_write_cache = val; 20359a8bb606SBryant G. Ly return count; 20369a8bb606SBryant G. Ly } 20379a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 20389a8bb606SBryant G. Ly 20395821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2040801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 20412d76443eSMike Christie &tcmu_attr_dev_config, 2042801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2043801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 2044b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2045801fc54dSBryant G. Ly NULL, 2046801fc54dSBryant G. Ly }; 2047801fc54dSBryant G. Ly 20487d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 20497d7a7435SNicholas Bellinger 20507d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 20517c9e7a6fSAndy Grover .name = "user", 20527c9e7a6fSAndy Grover .owner = THIS_MODULE, 2053a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 20547c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 20557c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 20567c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 20577c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 205892634706SMike Christie .destroy_device = tcmu_destroy_device, 20597c9e7a6fSAndy Grover .free_device = tcmu_free_device, 20607c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 20617c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 20627c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 20637c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 20647c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 20657d7a7435SNicholas Bellinger .tb_dev_attrib_attrs = NULL, 20667c9e7a6fSAndy Grover }; 20677c9e7a6fSAndy Grover 206889ec9cfdSMike Christie static void find_free_blocks(void) 2069b6df4b79SXiubo Li { 2070b6df4b79SXiubo Li struct tcmu_dev *udev; 2071b6df4b79SXiubo Li loff_t off; 2072af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2073af1dd7ffSMike Christie 2074af1dd7ffSMike Christie if (atomic_read(&global_db_count) <= TCMU_GLOBAL_MAX_BLOCKS) 2075af1dd7ffSMike Christie return; 2076b6df4b79SXiubo Li 2077b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2078b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2079b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2080b6df4b79SXiubo Li 2081b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2082b6df4b79SXiubo Li tcmu_handle_completions(udev); 2083b6df4b79SXiubo Li 2084af1dd7ffSMike Christie /* Skip the udevs in idle */ 2085af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2086b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2087b6df4b79SXiubo Li continue; 2088b6df4b79SXiubo Li } 2089b6df4b79SXiubo Li 2090b6df4b79SXiubo Li end = udev->dbi_max + 1; 2091b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2092b6df4b79SXiubo Li if (block == udev->dbi_max) { 2093b6df4b79SXiubo Li /* 2094af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2095af1dd7ffSMike Christie * reclaim any blocks. 2096b6df4b79SXiubo Li */ 2097b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2098b6df4b79SXiubo Li continue; 2099b6df4b79SXiubo Li } else if (block == end) { 2100b6df4b79SXiubo Li /* The current udev will goto idle state */ 2101b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2102b6df4b79SXiubo Li udev->dbi_max = 0; 2103b6df4b79SXiubo Li } else { 2104b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2105b6df4b79SXiubo Li udev->dbi_max = block; 2106b6df4b79SXiubo Li } 2107b6df4b79SXiubo Li 2108b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2109b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2110b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2111b6df4b79SXiubo Li 2112b6df4b79SXiubo Li /* Release the block pages */ 2113bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2114b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2115af1dd7ffSMike Christie 2116af1dd7ffSMike Christie total_freed += end - start; 2117af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2118af1dd7ffSMike Christie total_freed, udev->name); 2119b6df4b79SXiubo Li } 212089ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 212189ec9cfdSMike Christie 2122af1dd7ffSMike Christie if (atomic_read(&global_db_count) > TCMU_GLOBAL_MAX_BLOCKS) 2123af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2124b6df4b79SXiubo Li } 2125b6df4b79SXiubo Li 2126488ebe4cSMike Christie static void check_timedout_devices(void) 2127488ebe4cSMike Christie { 2128488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 2129488ebe4cSMike Christie LIST_HEAD(devs); 2130488ebe4cSMike Christie 2131488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2132488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2133488ebe4cSMike Christie 2134488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2135488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2136488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2137488ebe4cSMike Christie 21386fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2139488ebe4cSMike Christie idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 21406fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2141488ebe4cSMike Christie 2142488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2143488ebe4cSMike Christie } 2144488ebe4cSMike Christie 2145488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2146488ebe4cSMike Christie } 2147488ebe4cSMike Christie 21489972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 214989ec9cfdSMike Christie { 2150488ebe4cSMike Christie check_timedout_devices(); 215189ec9cfdSMike Christie find_free_blocks(); 215289ec9cfdSMike Christie } 215389ec9cfdSMike Christie 21547c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 21557c9e7a6fSAndy Grover { 2156801fc54dSBryant G. Ly int ret, i, k, len = 0; 21577c9e7a6fSAndy Grover 21587c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 21597c9e7a6fSAndy Grover 2160af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 21619972cebbSMike Christie 21627c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 21637c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 21647c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 21657c9e7a6fSAndy Grover 0, NULL); 21667c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 21677c9e7a6fSAndy Grover return -ENOMEM; 21687c9e7a6fSAndy Grover 21697c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 21707c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 21717c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 21727c9e7a6fSAndy Grover goto out_free_cache; 21737c9e7a6fSAndy Grover } 21747c9e7a6fSAndy Grover 21757c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 21767c9e7a6fSAndy Grover if (ret < 0) { 21777c9e7a6fSAndy Grover goto out_unreg_device; 21787c9e7a6fSAndy Grover } 21797c9e7a6fSAndy Grover 21807d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 21817d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 21827d7a7435SNicholas Bellinger } 2183801fc54dSBryant G. Ly for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { 2184801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 2185801fc54dSBryant G. Ly } 2186801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 21877d7a7435SNicholas Bellinger 21887d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 21897d7a7435SNicholas Bellinger if (!tcmu_attrs) { 21907d7a7435SNicholas Bellinger ret = -ENOMEM; 21917d7a7435SNicholas Bellinger goto out_unreg_genl; 21927d7a7435SNicholas Bellinger } 21937d7a7435SNicholas Bellinger 21947d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 21957d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 21967d7a7435SNicholas Bellinger } 2197801fc54dSBryant G. Ly for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { 2198801fc54dSBryant G. Ly tcmu_attrs[i] = tcmu_attrib_attrs[k]; 21999a8bb606SBryant G. Ly i++; 2200801fc54dSBryant G. Ly } 22017d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 22027d7a7435SNicholas Bellinger 22030a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 22047c9e7a6fSAndy Grover if (ret) 22057d7a7435SNicholas Bellinger goto out_attrs; 22067c9e7a6fSAndy Grover 22077c9e7a6fSAndy Grover return 0; 22087c9e7a6fSAndy Grover 22097d7a7435SNicholas Bellinger out_attrs: 22107d7a7435SNicholas Bellinger kfree(tcmu_attrs); 22117c9e7a6fSAndy Grover out_unreg_genl: 22127c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 22137c9e7a6fSAndy Grover out_unreg_device: 22147c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 22157c9e7a6fSAndy Grover out_free_cache: 22167c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 22177c9e7a6fSAndy Grover 22187c9e7a6fSAndy Grover return ret; 22197c9e7a6fSAndy Grover } 22207c9e7a6fSAndy Grover 22217c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 22227c9e7a6fSAndy Grover { 2223af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 22240a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 22257d7a7435SNicholas Bellinger kfree(tcmu_attrs); 22267c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 22277c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 22287c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 22297c9e7a6fSAndy Grover } 22307c9e7a6fSAndy Grover 22317c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 22327c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 22337c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 22347c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 22357c9e7a6fSAndy Grover 22367c9e7a6fSAndy Grover module_init(tcmu_module_init); 22377c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 2238