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 8080eb8761SMike Christie #define DATA_BLOCK_SHIFT PAGE_SHIFT 8180eb8761SMike Christie #define DATA_BLOCK_BITS_DEF (256 * 1024) 8226418649SSheng Yang #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) 837c9e7a6fSAndy Grover 8480eb8761SMike Christie #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) 8580eb8761SMike Christie #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) 8680eb8761SMike Christie 87b6df4b79SXiubo Li /* The total size of the ring is 8M + 256K * PAGE_SIZE */ 887c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 897c9e7a6fSAndy Grover 90af1dd7ffSMike Christie /* 91af1dd7ffSMike Christie * Default number of global data blocks(512K * PAGE_SIZE) 92af1dd7ffSMike Christie * when the unmap thread will be started. 93af1dd7ffSMike Christie */ 9480eb8761SMike Christie #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) 95b6df4b79SXiubo Li 96b3af66e2SMike Christie static u8 tcmu_kern_cmd_reply_supported; 97b3af66e2SMike Christie 987c9e7a6fSAndy Grover static struct device *tcmu_root_device; 997c9e7a6fSAndy Grover 1007c9e7a6fSAndy Grover struct tcmu_hba { 1017c9e7a6fSAndy Grover u32 host_id; 1027c9e7a6fSAndy Grover }; 1037c9e7a6fSAndy Grover 1047c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 1057c9e7a6fSAndy Grover 106b3af66e2SMike Christie struct tcmu_nl_cmd { 107b3af66e2SMike Christie /* wake up thread waiting for reply */ 108b3af66e2SMike Christie struct completion complete; 109b3af66e2SMike Christie int cmd; 110b3af66e2SMike Christie int status; 111b3af66e2SMike Christie }; 112b3af66e2SMike Christie 1137c9e7a6fSAndy Grover struct tcmu_dev { 114b6df4b79SXiubo Li struct list_head node; 115f3cdbe39SMike Christie struct kref kref; 116af1dd7ffSMike Christie 1177c9e7a6fSAndy Grover struct se_device se_dev; 1187c9e7a6fSAndy Grover 1197c9e7a6fSAndy Grover char *name; 1207c9e7a6fSAndy Grover struct se_hba *hba; 1217c9e7a6fSAndy Grover 1227c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 1237c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 124892782caSMike Christie #define TCMU_DEV_BIT_BLOCKED 2 1257c9e7a6fSAndy Grover unsigned long flags; 1267c9e7a6fSAndy Grover 1277c9e7a6fSAndy Grover struct uio_info uio_info; 1287c9e7a6fSAndy Grover 129b6df4b79SXiubo Li struct inode *inode; 130b6df4b79SXiubo Li 1317c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 1327c9e7a6fSAndy Grover size_t dev_size; 1337c9e7a6fSAndy Grover u32 cmdr_size; 1347c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1353d9b9555SAndy Grover /* Offset of data area from start of mb */ 13626418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1377c9e7a6fSAndy Grover size_t data_off; 1387c9e7a6fSAndy Grover size_t data_size; 13980eb8761SMike Christie uint32_t max_blocks; 14080eb8761SMike Christie size_t ring_size; 14126418649SSheng Yang 142b6df4b79SXiubo Li struct mutex cmdr_lock; 143af1dd7ffSMike Christie struct list_head cmdr_queue; 1447c9e7a6fSAndy Grover 145141685a3SXiubo Li uint32_t dbi_max; 146b6df4b79SXiubo Li uint32_t dbi_thresh; 14780eb8761SMike Christie unsigned long *data_bitmap; 148141685a3SXiubo Li struct radix_tree_root data_blocks; 149141685a3SXiubo Li 1507c9e7a6fSAndy Grover struct idr commands; 1517c9e7a6fSAndy Grover 1529103575aSMike Christie struct timer_list cmd_timer; 153af980e46SMike Christie unsigned int cmd_time_out; 1549103575aSMike Christie 1559103575aSMike Christie struct timer_list qfull_timer; 1569103575aSMike Christie int qfull_time_out; 1579103575aSMike Christie 158488ebe4cSMike Christie struct list_head timedout_entry; 1597c9e7a6fSAndy Grover 160b3af66e2SMike Christie spinlock_t nl_cmd_lock; 161b3af66e2SMike Christie struct tcmu_nl_cmd curr_nl_cmd; 162b3af66e2SMike Christie /* wake up threads waiting on curr_nl_cmd */ 163b3af66e2SMike Christie wait_queue_head_t nl_cmd_wq; 164b3af66e2SMike Christie 1657c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 166b849b456SKenjiro Nakayama 167b849b456SKenjiro Nakayama int nl_reply_supported; 1687c9e7a6fSAndy Grover }; 1697c9e7a6fSAndy Grover 1707c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1717c9e7a6fSAndy Grover 1727c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1737c9e7a6fSAndy Grover 1747c9e7a6fSAndy Grover struct tcmu_cmd { 1757c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1767c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 177af1dd7ffSMike Christie struct list_head cmdr_queue_entry; 1787c9e7a6fSAndy Grover 1797c9e7a6fSAndy Grover uint16_t cmd_id; 1807c9e7a6fSAndy Grover 18126418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1827c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 183141685a3SXiubo Li uint32_t dbi_cnt; 184141685a3SXiubo Li uint32_t dbi_cur; 185141685a3SXiubo Li uint32_t *dbi; 1867c9e7a6fSAndy Grover 1877c9e7a6fSAndy Grover unsigned long deadline; 1887c9e7a6fSAndy Grover 1897c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1907c9e7a6fSAndy Grover unsigned long flags; 1917c9e7a6fSAndy Grover }; 192af1dd7ffSMike Christie /* 193af1dd7ffSMike Christie * To avoid dead lock the mutex lock order should always be: 194af1dd7ffSMike Christie * 195af1dd7ffSMike Christie * mutex_lock(&root_udev_mutex); 196af1dd7ffSMike Christie * ... 197af1dd7ffSMike Christie * mutex_lock(&tcmu_dev->cmdr_lock); 198af1dd7ffSMike Christie * mutex_unlock(&tcmu_dev->cmdr_lock); 199af1dd7ffSMike Christie * ... 200af1dd7ffSMike Christie * mutex_unlock(&root_udev_mutex); 201af1dd7ffSMike Christie */ 202b6df4b79SXiubo Li static DEFINE_MUTEX(root_udev_mutex); 203b6df4b79SXiubo Li static LIST_HEAD(root_udev); 204b6df4b79SXiubo Li 205488ebe4cSMike Christie static DEFINE_SPINLOCK(timed_out_udevs_lock); 206488ebe4cSMike Christie static LIST_HEAD(timed_out_udevs); 207488ebe4cSMike Christie 20880eb8761SMike Christie static struct kmem_cache *tcmu_cmd_cache; 20980eb8761SMike Christie 210b6df4b79SXiubo Li static atomic_t global_db_count = ATOMIC_INIT(0); 211af1dd7ffSMike Christie static struct delayed_work tcmu_unmap_work; 21280eb8761SMike Christie static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; 213b6df4b79SXiubo Li 21480eb8761SMike Christie static int tcmu_set_global_max_data_area(const char *str, 21580eb8761SMike Christie const struct kernel_param *kp) 21680eb8761SMike Christie { 21780eb8761SMike Christie int ret, max_area_mb; 21880eb8761SMike Christie 21980eb8761SMike Christie ret = kstrtoint(str, 10, &max_area_mb); 22080eb8761SMike Christie if (ret) 22180eb8761SMike Christie return -EINVAL; 22280eb8761SMike Christie 22380eb8761SMike Christie if (max_area_mb <= 0) { 22480eb8761SMike Christie pr_err("global_max_data_area must be larger than 0.\n"); 22580eb8761SMike Christie return -EINVAL; 22680eb8761SMike Christie } 22780eb8761SMike Christie 22880eb8761SMike Christie tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); 22980eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 23080eb8761SMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 23180eb8761SMike Christie else 23280eb8761SMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 23380eb8761SMike Christie 23480eb8761SMike Christie return 0; 23580eb8761SMike Christie } 23680eb8761SMike Christie 23780eb8761SMike Christie static int tcmu_get_global_max_data_area(char *buffer, 23880eb8761SMike Christie const struct kernel_param *kp) 23980eb8761SMike Christie { 24080eb8761SMike Christie return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 24180eb8761SMike Christie } 24280eb8761SMike Christie 24380eb8761SMike Christie static const struct kernel_param_ops tcmu_global_max_data_area_op = { 24480eb8761SMike Christie .set = tcmu_set_global_max_data_area, 24580eb8761SMike Christie .get = tcmu_get_global_max_data_area, 24680eb8761SMike Christie }; 24780eb8761SMike Christie 24880eb8761SMike Christie module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, 24980eb8761SMike Christie S_IWUSR | S_IRUGO); 25080eb8761SMike Christie MODULE_PARM_DESC(global_max_data_area_mb, 25180eb8761SMike Christie "Max MBs allowed to be allocated to all the tcmu device's " 25280eb8761SMike Christie "data areas."); 2537c9e7a6fSAndy Grover 2547c9e7a6fSAndy Grover /* multicast group */ 2557c9e7a6fSAndy Grover enum tcmu_multicast_groups { 2567c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 2577c9e7a6fSAndy Grover }; 2587c9e7a6fSAndy Grover 2597c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 2607c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 2617c9e7a6fSAndy Grover }; 2627c9e7a6fSAndy Grover 263b3af66e2SMike Christie static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { 264b3af66e2SMike Christie [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, 265b3af66e2SMike Christie [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, 266b3af66e2SMike Christie [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, 267b3af66e2SMike Christie [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, 268b3af66e2SMike Christie [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, 269b3af66e2SMike Christie }; 270b3af66e2SMike Christie 271b3af66e2SMike Christie static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) 272b3af66e2SMike Christie { 273b3af66e2SMike Christie struct se_device *dev; 274b3af66e2SMike Christie struct tcmu_dev *udev; 275b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd; 276b3af66e2SMike Christie int dev_id, rc, ret = 0; 277b3af66e2SMike Christie bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); 278b3af66e2SMike Christie 279b3af66e2SMike Christie if (!info->attrs[TCMU_ATTR_CMD_STATUS] || 280b3af66e2SMike Christie !info->attrs[TCMU_ATTR_DEVICE_ID]) { 281b3af66e2SMike Christie printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); 282b3af66e2SMike Christie return -EINVAL; 283b3af66e2SMike Christie } 284b3af66e2SMike Christie 285b3af66e2SMike Christie dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); 286b3af66e2SMike Christie rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); 287b3af66e2SMike Christie 288b3af66e2SMike Christie dev = target_find_device(dev_id, !is_removed); 289b3af66e2SMike Christie if (!dev) { 290b3af66e2SMike Christie printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", 291b3af66e2SMike Christie completed_cmd, rc, dev_id); 292b3af66e2SMike Christie return -ENODEV; 293b3af66e2SMike Christie } 294b3af66e2SMike Christie udev = TCMU_DEV(dev); 295b3af66e2SMike Christie 296b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 297b3af66e2SMike Christie nl_cmd = &udev->curr_nl_cmd; 298b3af66e2SMike Christie 299b3af66e2SMike Christie pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, 300b3af66e2SMike Christie nl_cmd->cmd, completed_cmd, rc); 301b3af66e2SMike Christie 302b3af66e2SMike Christie if (nl_cmd->cmd != completed_cmd) { 303b3af66e2SMike Christie printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", 304b3af66e2SMike Christie completed_cmd, nl_cmd->cmd); 305b3af66e2SMike Christie ret = -EINVAL; 306b3af66e2SMike Christie } else { 307b3af66e2SMike Christie nl_cmd->status = rc; 308b3af66e2SMike Christie } 309b3af66e2SMike Christie 310b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 311b3af66e2SMike Christie if (!is_removed) 312b3af66e2SMike Christie target_undepend_item(&dev->dev_group.cg_item); 313b3af66e2SMike Christie if (!ret) 314b3af66e2SMike Christie complete(&nl_cmd->complete); 315b3af66e2SMike Christie return ret; 316b3af66e2SMike Christie } 317b3af66e2SMike Christie 318b3af66e2SMike Christie static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) 319b3af66e2SMike Christie { 320b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); 321b3af66e2SMike Christie } 322b3af66e2SMike Christie 323b3af66e2SMike Christie static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) 324b3af66e2SMike Christie { 325b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); 326b3af66e2SMike Christie } 327b3af66e2SMike Christie 328b3af66e2SMike Christie static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, 329b3af66e2SMike Christie struct genl_info *info) 330b3af66e2SMike Christie { 331b3af66e2SMike Christie return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); 332b3af66e2SMike Christie } 333b3af66e2SMike Christie 334b3af66e2SMike Christie static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) 335b3af66e2SMike Christie { 336b3af66e2SMike Christie if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { 337b3af66e2SMike Christie tcmu_kern_cmd_reply_supported = 338b3af66e2SMike Christie nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); 339b3af66e2SMike Christie printk(KERN_INFO "tcmu daemon: command reply support %u.\n", 340b3af66e2SMike Christie tcmu_kern_cmd_reply_supported); 341b3af66e2SMike Christie } 342b3af66e2SMike Christie 343b3af66e2SMike Christie return 0; 344b3af66e2SMike Christie } 345b3af66e2SMike Christie 346b3af66e2SMike Christie static const struct genl_ops tcmu_genl_ops[] = { 347b3af66e2SMike Christie { 348b3af66e2SMike Christie .cmd = TCMU_CMD_SET_FEATURES, 349b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 350b3af66e2SMike Christie .policy = tcmu_attr_policy, 351b3af66e2SMike Christie .doit = tcmu_genl_set_features, 352b3af66e2SMike Christie }, 353b3af66e2SMike Christie { 354b3af66e2SMike Christie .cmd = TCMU_CMD_ADDED_DEVICE_DONE, 355b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 356b3af66e2SMike Christie .policy = tcmu_attr_policy, 357b3af66e2SMike Christie .doit = tcmu_genl_add_dev_done, 358b3af66e2SMike Christie }, 359b3af66e2SMike Christie { 360b3af66e2SMike Christie .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, 361b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 362b3af66e2SMike Christie .policy = tcmu_attr_policy, 363b3af66e2SMike Christie .doit = tcmu_genl_rm_dev_done, 364b3af66e2SMike Christie }, 365b3af66e2SMike Christie { 366b3af66e2SMike Christie .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, 367b3af66e2SMike Christie .flags = GENL_ADMIN_PERM, 368b3af66e2SMike Christie .policy = tcmu_attr_policy, 369b3af66e2SMike Christie .doit = tcmu_genl_reconfig_dev_done, 370b3af66e2SMike Christie }, 371b3af66e2SMike Christie }; 372b3af66e2SMike Christie 3737c9e7a6fSAndy Grover /* Our generic netlink family */ 37456989f6dSJohannes Berg static struct genl_family tcmu_genl_family __ro_after_init = { 375489111e5SJohannes Berg .module = THIS_MODULE, 3767c9e7a6fSAndy Grover .hdrsize = 0, 3777c9e7a6fSAndy Grover .name = "TCM-USER", 378b3af66e2SMike Christie .version = 2, 3797c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 3807c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 3817c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 38220c08b36SSheng Yang .netnsok = true, 383b3af66e2SMike Christie .ops = tcmu_genl_ops, 384b3af66e2SMike Christie .n_ops = ARRAY_SIZE(tcmu_genl_ops), 3857c9e7a6fSAndy Grover }; 3867c9e7a6fSAndy Grover 387141685a3SXiubo Li #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) 388141685a3SXiubo Li #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) 389141685a3SXiubo Li #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) 390141685a3SXiubo Li #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) 391141685a3SXiubo Li 392b6df4b79SXiubo Li static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) 393141685a3SXiubo Li { 394141685a3SXiubo Li struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 395141685a3SXiubo Li uint32_t i; 396141685a3SXiubo Li 397b6df4b79SXiubo Li for (i = 0; i < len; i++) 398141685a3SXiubo Li clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); 399141685a3SXiubo Li } 400141685a3SXiubo Li 401b6df4b79SXiubo Li static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, 402b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 403141685a3SXiubo Li { 404b6df4b79SXiubo Li struct page *page; 405b6df4b79SXiubo Li int ret, dbi; 406141685a3SXiubo Li 407b6df4b79SXiubo Li dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); 408b6df4b79SXiubo Li if (dbi == udev->dbi_thresh) 409b6df4b79SXiubo Li return false; 410b6df4b79SXiubo Li 411b6df4b79SXiubo Li page = radix_tree_lookup(&udev->data_blocks, dbi); 412b6df4b79SXiubo Li if (!page) { 413b6df4b79SXiubo Li if (atomic_add_return(1, &global_db_count) > 41480eb8761SMike Christie tcmu_global_max_blocks) 415af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 416b6df4b79SXiubo Li 417b6df4b79SXiubo Li /* try to get new page from the mm */ 418b6df4b79SXiubo Li page = alloc_page(GFP_KERNEL); 419b6df4b79SXiubo Li if (!page) 420daf78c30SXiubo Li goto err_alloc; 421b6df4b79SXiubo Li 422b6df4b79SXiubo Li ret = radix_tree_insert(&udev->data_blocks, dbi, page); 423daf78c30SXiubo Li if (ret) 424daf78c30SXiubo Li goto err_insert; 425b6df4b79SXiubo Li } 426b6df4b79SXiubo Li 427141685a3SXiubo Li if (dbi > udev->dbi_max) 428141685a3SXiubo Li udev->dbi_max = dbi; 429141685a3SXiubo Li 430141685a3SXiubo Li set_bit(dbi, udev->data_bitmap); 431b6df4b79SXiubo Li tcmu_cmd_set_dbi(tcmu_cmd, dbi); 432141685a3SXiubo Li 433b6df4b79SXiubo Li return true; 434daf78c30SXiubo Li err_insert: 435daf78c30SXiubo Li __free_page(page); 436daf78c30SXiubo Li err_alloc: 437daf78c30SXiubo Li atomic_dec(&global_db_count); 438daf78c30SXiubo Li return false; 439141685a3SXiubo Li } 440141685a3SXiubo Li 441b6df4b79SXiubo Li static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, 442b6df4b79SXiubo Li struct tcmu_cmd *tcmu_cmd) 443b6df4b79SXiubo Li { 444b6df4b79SXiubo Li int i; 445b6df4b79SXiubo Li 446b6df4b79SXiubo Li for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { 447b6df4b79SXiubo Li if (!tcmu_get_empty_block(udev, tcmu_cmd)) 448af1dd7ffSMike Christie return false; 449141685a3SXiubo Li } 450b6df4b79SXiubo Li return true; 451141685a3SXiubo Li } 452141685a3SXiubo Li 453b6df4b79SXiubo Li static inline struct page * 454b6df4b79SXiubo Li tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 455141685a3SXiubo Li { 456141685a3SXiubo Li return radix_tree_lookup(&udev->data_blocks, dbi); 457141685a3SXiubo Li } 458141685a3SXiubo Li 459141685a3SXiubo Li static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) 460141685a3SXiubo Li { 461141685a3SXiubo Li kfree(tcmu_cmd->dbi); 462141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 463141685a3SXiubo Li } 464141685a3SXiubo Li 465141685a3SXiubo Li static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) 466141685a3SXiubo Li { 467141685a3SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 468141685a3SXiubo Li size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); 469141685a3SXiubo Li 470141685a3SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 471141685a3SXiubo Li BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 472141685a3SXiubo Li data_length += round_up(se_cmd->t_bidi_data_sg->length, 473141685a3SXiubo Li DATA_BLOCK_SIZE); 474141685a3SXiubo Li } 475141685a3SXiubo Li 476141685a3SXiubo Li return data_length; 477141685a3SXiubo Li } 478141685a3SXiubo Li 479141685a3SXiubo Li static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) 480141685a3SXiubo Li { 481141685a3SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 482141685a3SXiubo Li 483141685a3SXiubo Li return data_length / DATA_BLOCK_SIZE; 484141685a3SXiubo Li } 485141685a3SXiubo Li 4867c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 4877c9e7a6fSAndy Grover { 4887c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 4897c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 4907c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 4917c9e7a6fSAndy Grover 4927c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 4937c9e7a6fSAndy Grover if (!tcmu_cmd) 4947c9e7a6fSAndy Grover return NULL; 4957c9e7a6fSAndy Grover 496af1dd7ffSMike Christie INIT_LIST_HEAD(&tcmu_cmd->cmdr_queue_entry); 4977c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 4987c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 4997c9e7a6fSAndy Grover 500141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 501141685a3SXiubo Li tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); 502141685a3SXiubo Li tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), 503141685a3SXiubo Li GFP_KERNEL); 504141685a3SXiubo Li if (!tcmu_cmd->dbi) { 505141685a3SXiubo Li kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 506141685a3SXiubo Li return NULL; 507141685a3SXiubo Li } 508141685a3SXiubo Li 5097c9e7a6fSAndy Grover return tcmu_cmd; 5107c9e7a6fSAndy Grover } 5117c9e7a6fSAndy Grover 5127c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 5137c9e7a6fSAndy Grover { 514b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 51526d2b310Stangwenji void *start = vaddr - offset; 5167c9e7a6fSAndy Grover 5177c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 5187c9e7a6fSAndy Grover 5197c9e7a6fSAndy Grover while (size) { 52026d2b310Stangwenji flush_dcache_page(virt_to_page(start)); 52126d2b310Stangwenji start += PAGE_SIZE; 5227c9e7a6fSAndy Grover size -= PAGE_SIZE; 5237c9e7a6fSAndy Grover } 5247c9e7a6fSAndy Grover } 5257c9e7a6fSAndy Grover 5267c9e7a6fSAndy Grover /* 5277c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 5287c9e7a6fSAndy Grover * we can't use circ_buf.h. 5297c9e7a6fSAndy Grover */ 5307c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 5317c9e7a6fSAndy Grover { 5327c9e7a6fSAndy Grover int diff = head - tail; 5337c9e7a6fSAndy Grover 5347c9e7a6fSAndy Grover if (diff >= 0) 5357c9e7a6fSAndy Grover return diff; 5367c9e7a6fSAndy Grover else 5377c9e7a6fSAndy Grover return size + diff; 5387c9e7a6fSAndy Grover } 5397c9e7a6fSAndy Grover 5407c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 5417c9e7a6fSAndy Grover { 5427c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 5437c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 5447c9e7a6fSAndy Grover } 5457c9e7a6fSAndy Grover 5467c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 5477c9e7a6fSAndy Grover { 5487c9e7a6fSAndy Grover return size - head; 5497c9e7a6fSAndy Grover } 5507c9e7a6fSAndy Grover 5513e609135SXiubo Li static inline void new_iov(struct iovec **iov, int *iov_cnt) 552f1dbd087SSheng Yang { 553f1dbd087SSheng Yang struct iovec *iovec; 554f1dbd087SSheng Yang 555f1dbd087SSheng Yang if (*iov_cnt != 0) 556f1dbd087SSheng Yang (*iov)++; 557f1dbd087SSheng Yang (*iov_cnt)++; 558f1dbd087SSheng Yang 559f1dbd087SSheng Yang iovec = *iov; 560f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 561f1dbd087SSheng Yang } 562f1dbd087SSheng Yang 5637c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 5647c9e7a6fSAndy Grover 56526418649SSheng Yang /* offset is relative to mb_addr */ 566141685a3SXiubo Li static inline size_t get_block_offset_user(struct tcmu_dev *dev, 567141685a3SXiubo Li int dbi, int remaining) 56826418649SSheng Yang { 569141685a3SXiubo Li return dev->data_off + dbi * DATA_BLOCK_SIZE + 57026418649SSheng Yang DATA_BLOCK_SIZE - remaining; 57126418649SSheng Yang } 57226418649SSheng Yang 573daf78c30SXiubo Li static inline size_t iov_tail(struct iovec *iov) 57426418649SSheng Yang { 57526418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 57626418649SSheng Yang } 57726418649SSheng Yang 5781a1fc0b8SMike Christie static void scatter_data_area(struct tcmu_dev *udev, 579141685a3SXiubo Li struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, 580141685a3SXiubo Li unsigned int data_nents, struct iovec **iov, 581141685a3SXiubo Li int *iov_cnt, bool copy_data) 582f97ec7dbSIlias Tsitsimpis { 583141685a3SXiubo Li int i, dbi; 58426418649SSheng Yang int block_remaining = 0; 585141685a3SXiubo Li void *from, *to = NULL; 586141685a3SXiubo Li size_t copy_bytes, to_offset, offset; 587f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 588b6df4b79SXiubo Li struct page *page; 589f97ec7dbSIlias Tsitsimpis 590f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 59126418649SSheng Yang int sg_remaining = sg->length; 592f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 59326418649SSheng Yang while (sg_remaining > 0) { 59426418649SSheng Yang if (block_remaining == 0) { 595b6df4b79SXiubo Li if (to) 596b6df4b79SXiubo Li kunmap_atomic(to); 597b6df4b79SXiubo Li 59826418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 599b6df4b79SXiubo Li dbi = tcmu_cmd_get_dbi(tcmu_cmd); 600b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 601b6df4b79SXiubo Li to = kmap_atomic(page); 602141685a3SXiubo Li } 603141685a3SXiubo Li 6043e609135SXiubo Li /* 6053e609135SXiubo Li * Covert to virtual offset of the ring data area. 6063e609135SXiubo Li */ 607141685a3SXiubo Li to_offset = get_block_offset_user(udev, dbi, 60826418649SSheng Yang block_remaining); 609141685a3SXiubo Li 6103e609135SXiubo Li /* 6113e609135SXiubo Li * The following code will gather and map the blocks 6123e609135SXiubo Li * to the same iovec when the blocks are all next to 6133e609135SXiubo Li * each other. 6143e609135SXiubo Li */ 6153e609135SXiubo Li copy_bytes = min_t(size_t, sg_remaining, 6163e609135SXiubo Li block_remaining); 61726418649SSheng Yang if (*iov_cnt != 0 && 618daf78c30SXiubo Li to_offset == iov_tail(*iov)) { 6193e609135SXiubo Li /* 6203e609135SXiubo Li * Will append to the current iovec, because 6213e609135SXiubo Li * the current block page is next to the 6223e609135SXiubo Li * previous one. 6233e609135SXiubo Li */ 624f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 62526418649SSheng Yang } else { 6263e609135SXiubo Li /* 6273e609135SXiubo Li * Will allocate a new iovec because we are 6283e609135SXiubo Li * first time here or the current block page 6293e609135SXiubo Li * is not next to the previous one. 6303e609135SXiubo Li */ 6313e609135SXiubo Li new_iov(iov, iov_cnt); 63226418649SSheng Yang (*iov)->iov_base = (void __user *)to_offset; 633f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 63426418649SSheng Yang } 6353e609135SXiubo Li 636f97ec7dbSIlias Tsitsimpis if (copy_data) { 637c542942cSXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 638c542942cSXiubo Li memcpy(to + offset, 639c542942cSXiubo Li from + sg->length - sg_remaining, 64026418649SSheng Yang copy_bytes); 641f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 642f97ec7dbSIlias Tsitsimpis } 6433e609135SXiubo Li 64426418649SSheng Yang sg_remaining -= copy_bytes; 64526418649SSheng Yang block_remaining -= copy_bytes; 646f97ec7dbSIlias Tsitsimpis } 647e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 648f97ec7dbSIlias Tsitsimpis } 6493e609135SXiubo Li 650b6df4b79SXiubo Li if (to) 651b6df4b79SXiubo Li kunmap_atomic(to); 6520c28481fSSheng Yang } 6530c28481fSSheng Yang 654a5d68ba8SXiubo Li static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 655a5d68ba8SXiubo Li bool bidi) 656f97ec7dbSIlias Tsitsimpis { 657a5d68ba8SXiubo Li struct se_cmd *se_cmd = cmd->se_cmd; 658141685a3SXiubo Li int i, dbi; 65926418649SSheng Yang int block_remaining = 0; 660b6df4b79SXiubo Li void *from = NULL, *to; 661141685a3SXiubo Li size_t copy_bytes, offset; 662a5d68ba8SXiubo Li struct scatterlist *sg, *data_sg; 663b6df4b79SXiubo Li struct page *page; 664a5d68ba8SXiubo Li unsigned int data_nents; 665141685a3SXiubo Li uint32_t count = 0; 666a5d68ba8SXiubo Li 667a5d68ba8SXiubo Li if (!bidi) { 668a5d68ba8SXiubo Li data_sg = se_cmd->t_data_sg; 669a5d68ba8SXiubo Li data_nents = se_cmd->t_data_nents; 670a5d68ba8SXiubo Li } else { 671a5d68ba8SXiubo Li 672a5d68ba8SXiubo Li /* 673a5d68ba8SXiubo Li * For bidi case, the first count blocks are for Data-Out 674a5d68ba8SXiubo Li * buffer blocks, and before gathering the Data-In buffer 675a5d68ba8SXiubo Li * the Data-Out buffer blocks should be discarded. 676a5d68ba8SXiubo Li */ 677a5d68ba8SXiubo Li count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); 678a5d68ba8SXiubo Li 679a5d68ba8SXiubo Li data_sg = se_cmd->t_bidi_data_sg; 680a5d68ba8SXiubo Li data_nents = se_cmd->t_bidi_data_nents; 681a5d68ba8SXiubo Li } 682f97ec7dbSIlias Tsitsimpis 683141685a3SXiubo Li tcmu_cmd_set_dbi_cur(cmd, count); 684141685a3SXiubo Li 685f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 68626418649SSheng Yang int sg_remaining = sg->length; 687f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 68826418649SSheng Yang while (sg_remaining > 0) { 68926418649SSheng Yang if (block_remaining == 0) { 690b6df4b79SXiubo Li if (from) 691b6df4b79SXiubo Li kunmap_atomic(from); 692b6df4b79SXiubo Li 69326418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 694141685a3SXiubo Li dbi = tcmu_cmd_get_dbi(cmd); 695b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 696b6df4b79SXiubo Li from = kmap_atomic(page); 69726418649SSheng Yang } 69826418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 69926418649SSheng Yang block_remaining); 700141685a3SXiubo Li offset = DATA_BLOCK_SIZE - block_remaining; 701f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 702c542942cSXiubo Li memcpy(to + sg->length - sg_remaining, from + offset, 70326418649SSheng Yang copy_bytes); 704f97ec7dbSIlias Tsitsimpis 70526418649SSheng Yang sg_remaining -= copy_bytes; 70626418649SSheng Yang block_remaining -= copy_bytes; 707f97ec7dbSIlias Tsitsimpis } 708e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 709f97ec7dbSIlias Tsitsimpis } 710b6df4b79SXiubo Li if (from) 711b6df4b79SXiubo Li kunmap_atomic(from); 712f97ec7dbSIlias Tsitsimpis } 713f97ec7dbSIlias Tsitsimpis 714b6df4b79SXiubo Li static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) 71526418649SSheng Yang { 7163c0f26ffSMike Christie return thresh - bitmap_weight(bitmap, thresh); 71726418649SSheng Yang } 71826418649SSheng Yang 7197c9e7a6fSAndy Grover /* 720f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 7213d9b9555SAndy Grover * space available on the data area. 7227c9e7a6fSAndy Grover * 7237c9e7a6fSAndy Grover * Called with ring lock held. 7247c9e7a6fSAndy Grover */ 725b6df4b79SXiubo Li static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, 726b6df4b79SXiubo Li size_t cmd_size, size_t data_needed) 7277c9e7a6fSAndy Grover { 7287c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 729b6df4b79SXiubo Li uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) 730b6df4b79SXiubo Li / DATA_BLOCK_SIZE; 7310241fd39SNicholas Bellinger size_t space, cmd_needed; 7327c9e7a6fSAndy Grover u32 cmd_head; 7337c9e7a6fSAndy Grover 7347c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 7357c9e7a6fSAndy Grover 7367c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 7377c9e7a6fSAndy Grover 738f56574a2SAndy Grover /* 739f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 740f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 741f56574a2SAndy Grover */ 742f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 743f56574a2SAndy Grover cmd_needed = cmd_size; 744f56574a2SAndy Grover else 745f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 746f56574a2SAndy Grover 7477c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 7487c9e7a6fSAndy Grover if (space < cmd_needed) { 7497c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 7507c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 7517c9e7a6fSAndy Grover return false; 7527c9e7a6fSAndy Grover } 7537c9e7a6fSAndy Grover 754b6df4b79SXiubo Li /* try to check and get the data blocks as needed */ 755b6df4b79SXiubo Li space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); 7563c0f26ffSMike Christie if ((space * DATA_BLOCK_SIZE) < data_needed) { 75780eb8761SMike Christie unsigned long blocks_left = 75880eb8761SMike Christie (udev->max_blocks - udev->dbi_thresh) + space; 759b6df4b79SXiubo Li 760b6df4b79SXiubo Li if (blocks_left < blocks_needed) { 761b6df4b79SXiubo Li pr_debug("no data space: only %lu available, but ask for %zu\n", 762b6df4b79SXiubo Li blocks_left * DATA_BLOCK_SIZE, 763b6df4b79SXiubo Li data_needed); 7647c9e7a6fSAndy Grover return false; 7657c9e7a6fSAndy Grover } 7667c9e7a6fSAndy Grover 767f890f579SMike Christie udev->dbi_thresh += blocks_needed; 76880eb8761SMike Christie if (udev->dbi_thresh > udev->max_blocks) 76980eb8761SMike Christie udev->dbi_thresh = udev->max_blocks; 770b6df4b79SXiubo Li } 771b6df4b79SXiubo Li 772daf78c30SXiubo Li return tcmu_get_empty_blocks(udev, cmd); 7737c9e7a6fSAndy Grover } 7747c9e7a6fSAndy Grover 775fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) 776fe25cc34SXiubo Li { 777fe25cc34SXiubo Li return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), 778fe25cc34SXiubo Li sizeof(struct tcmu_cmd_entry)); 779fe25cc34SXiubo Li } 780fe25cc34SXiubo Li 781fe25cc34SXiubo Li static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, 782fe25cc34SXiubo Li size_t base_command_size) 783fe25cc34SXiubo Li { 784fe25cc34SXiubo Li struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 785fe25cc34SXiubo Li size_t command_size; 786fe25cc34SXiubo Li 787fe25cc34SXiubo Li command_size = base_command_size + 788fe25cc34SXiubo Li round_up(scsi_command_size(se_cmd->t_task_cdb), 789fe25cc34SXiubo Li TCMU_OP_ALIGN_SIZE); 790fe25cc34SXiubo Li 791fe25cc34SXiubo Li WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 792fe25cc34SXiubo Li 793fe25cc34SXiubo Li return command_size; 794fe25cc34SXiubo Li } 795fe25cc34SXiubo Li 7969103575aSMike Christie static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, 7979103575aSMike Christie struct timer_list *timer) 7980d44374cSMike Christie { 7990d44374cSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 8000d44374cSMike Christie int cmd_id; 8010d44374cSMike Christie 8020d44374cSMike Christie if (tcmu_cmd->cmd_id) 8039103575aSMike Christie goto setup_timer; 8040d44374cSMike Christie 8050d44374cSMike Christie cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); 8060d44374cSMike Christie if (cmd_id < 0) { 8070d44374cSMike Christie pr_err("tcmu: Could not allocate cmd id.\n"); 8080d44374cSMike Christie return cmd_id; 8090d44374cSMike Christie } 8100d44374cSMike Christie tcmu_cmd->cmd_id = cmd_id; 8110d44374cSMike Christie 812af1dd7ffSMike Christie pr_debug("allocated cmd %u for dev %s tmo %lu\n", tcmu_cmd->cmd_id, 813af1dd7ffSMike Christie udev->name, tmo / MSEC_PER_SEC); 8140d44374cSMike Christie 8159103575aSMike Christie setup_timer: 8169103575aSMike Christie if (!tmo) 8179103575aSMike Christie return 0; 8189103575aSMike Christie 8190d44374cSMike Christie tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); 8209103575aSMike Christie mod_timer(timer, tcmu_cmd->deadline); 8210d44374cSMike Christie return 0; 8220d44374cSMike Christie } 8230d44374cSMike Christie 824af1dd7ffSMike Christie static int add_to_cmdr_queue(struct tcmu_cmd *tcmu_cmd) 825af1dd7ffSMike Christie { 826af1dd7ffSMike Christie struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 8279103575aSMike Christie unsigned int tmo; 828af1dd7ffSMike Christie int ret; 829af1dd7ffSMike Christie 8309103575aSMike Christie /* 8319103575aSMike Christie * For backwards compat if qfull_time_out is not set use 8329103575aSMike Christie * cmd_time_out and if that's not set use the default time out. 8339103575aSMike Christie */ 8349103575aSMike Christie if (!udev->qfull_time_out) 8359103575aSMike Christie return -ETIMEDOUT; 8369103575aSMike Christie else if (udev->qfull_time_out > 0) 8379103575aSMike Christie tmo = udev->qfull_time_out; 8389103575aSMike Christie else if (udev->cmd_time_out) 8399103575aSMike Christie tmo = udev->cmd_time_out; 8409103575aSMike Christie else 8419103575aSMike Christie tmo = TCMU_TIME_OUT; 8429103575aSMike Christie 8439103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); 844af1dd7ffSMike Christie if (ret) 845af1dd7ffSMike Christie return ret; 846af1dd7ffSMike Christie 847af1dd7ffSMike Christie list_add_tail(&tcmu_cmd->cmdr_queue_entry, &udev->cmdr_queue); 848af1dd7ffSMike Christie pr_debug("adding cmd %u on dev %s to ring space wait queue\n", 849af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 850af1dd7ffSMike Christie return 0; 851af1dd7ffSMike Christie } 852af1dd7ffSMike Christie 8536fd0ce79SMike Christie /** 8546fd0ce79SMike Christie * queue_cmd_ring - queue cmd to ring or internally 8556fd0ce79SMike Christie * @tcmu_cmd: cmd to queue 8566fd0ce79SMike Christie * @scsi_err: TCM error code if failure (-1) returned. 8576fd0ce79SMike Christie * 8586fd0ce79SMike Christie * Returns: 8596fd0ce79SMike Christie * -1 we cannot queue internally or to the ring. 8606fd0ce79SMike Christie * 0 success 861af1dd7ffSMike Christie * 1 internally queued to wait for ring memory to free. 8626fd0ce79SMike Christie */ 8636fd0ce79SMike Christie static sense_reason_t queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, int *scsi_err) 8647c9e7a6fSAndy Grover { 8657c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 8667c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 8677c9e7a6fSAndy Grover size_t base_command_size, command_size; 8687c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8697c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 8707c9e7a6fSAndy Grover struct iovec *iov; 871141685a3SXiubo Li int iov_cnt, ret; 8727c9e7a6fSAndy Grover uint32_t cmd_head; 8737c9e7a6fSAndy Grover uint64_t cdb_off; 874f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 875ab22d260SXiubo Li size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); 8767c9e7a6fSAndy Grover 8776fd0ce79SMike Christie *scsi_err = TCM_NO_SENSE; 8786fd0ce79SMike Christie 879892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { 880892782caSMike Christie *scsi_err = TCM_LUN_BUSY; 881892782caSMike Christie return -1; 882892782caSMike Christie } 883892782caSMike Christie 8846fd0ce79SMike Christie if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 8856fd0ce79SMike Christie *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 8866fd0ce79SMike Christie return -1; 8876fd0ce79SMike Christie } 8887c9e7a6fSAndy Grover 8897c9e7a6fSAndy Grover /* 8907c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 8917c9e7a6fSAndy Grover * also may be larger if the iov array is large. 8927c9e7a6fSAndy Grover * 893fe25cc34SXiubo Li * We prepare as many iovs as possbile for potential uses here, 894fe25cc34SXiubo Li * because it's expensive to tell how many regions are freed in 895fe25cc34SXiubo Li * the bitmap & global data pool, as the size calculated here 896fe25cc34SXiubo Li * will only be used to do the checks. 897fe25cc34SXiubo Li * 898fe25cc34SXiubo Li * The size will be recalculated later as actually needed to save 899fe25cc34SXiubo Li * cmd area memories. 9007c9e7a6fSAndy Grover */ 901fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); 902fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 9037c9e7a6fSAndy Grover 904af1dd7ffSMike Christie if (!list_empty(&udev->cmdr_queue)) 905af1dd7ffSMike Christie goto queue; 9067c9e7a6fSAndy Grover 9077c9e7a6fSAndy Grover mb = udev->mb_addr; 9087c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 909554617b2SAndy Grover if ((command_size > (udev->cmdr_size / 2)) || 910554617b2SAndy Grover data_length > udev->data_size) { 911554617b2SAndy Grover pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " 9123d9b9555SAndy Grover "cmd ring/data area\n", command_size, data_length, 9137c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 9146fd0ce79SMike Christie *scsi_err = TCM_INVALID_CDB_FIELD; 9156fd0ce79SMike Christie return -1; 916554617b2SAndy Grover } 9177c9e7a6fSAndy Grover 918af1dd7ffSMike Christie if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { 919810b8153SMike Christie /* 920810b8153SMike Christie * Don't leave commands partially setup because the unmap 921810b8153SMike Christie * thread might need the blocks to make forward progress. 922810b8153SMike Christie */ 923810b8153SMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); 924810b8153SMike Christie tcmu_cmd_reset_dbi_cur(tcmu_cmd); 925af1dd7ffSMike Christie goto queue; 9267c9e7a6fSAndy Grover } 9277c9e7a6fSAndy Grover 928f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 929f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 930f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 931f56574a2SAndy Grover 9327c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 9330ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 9340ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 9350ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 9360ad46af8SAndy Grover entry->hdr.kflags = 0; 9370ad46af8SAndy Grover entry->hdr.uflags = 0; 9389d62bc0eSXiubo Li tcmu_flush_dcache_range(entry, sizeof(*entry)); 9397c9e7a6fSAndy Grover 9407c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 9419d62bc0eSXiubo Li tcmu_flush_dcache_range(mb, sizeof(*mb)); 9427c9e7a6fSAndy Grover 9437c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 9447c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 9457c9e7a6fSAndy Grover } 9467c9e7a6fSAndy Grover 9477c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 948b3743c71SXiubo Li memset(entry, 0, command_size); 9490ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 9507c9e7a6fSAndy Grover 9513d9b9555SAndy Grover /* Handle allocating space from the data area */ 952b6df4b79SXiubo Li tcmu_cmd_reset_dbi_cur(tcmu_cmd); 9537c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 954f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 955e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 956e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 9571a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, 958b6df4b79SXiubo Li se_cmd->t_data_nents, &iov, &iov_cnt, 959b6df4b79SXiubo Li copy_to_data_area); 9607c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 9617c9e7a6fSAndy Grover 962e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 963e4648b01SIlias Tsitsimpis iov_cnt = 0; 964b3743c71SXiubo Li if (se_cmd->se_cmd_flags & SCF_BIDI) { 965ab22d260SXiubo Li iov++; 9661a1fc0b8SMike Christie scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, 9671a1fc0b8SMike Christie se_cmd->t_bidi_data_nents, &iov, &iov_cnt, 9681a1fc0b8SMike Christie false); 969ab22d260SXiubo Li } 970b3743c71SXiubo Li entry->req.iov_bidi_cnt = iov_cnt; 97126418649SSheng Yang 9729103575aSMike Christie ret = tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, 9739103575aSMike Christie &udev->cmd_timer); 9740d44374cSMike Christie if (ret) { 9750d44374cSMike Christie tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); 97697488c73SDan Carpenter mutex_unlock(&udev->cmdr_lock); 9776fd0ce79SMike Christie 9786fd0ce79SMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 9796fd0ce79SMike Christie return -1; 9800d44374cSMike Christie } 9810d44374cSMike Christie entry->hdr.cmd_id = tcmu_cmd->cmd_id; 9820d44374cSMike Christie 983fe25cc34SXiubo Li /* 984fe25cc34SXiubo Li * Recalaulate the command's base size and size according 985fe25cc34SXiubo Li * to the actual needs 986fe25cc34SXiubo Li */ 987fe25cc34SXiubo Li base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + 988fe25cc34SXiubo Li entry->req.iov_bidi_cnt); 989fe25cc34SXiubo Li command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); 990fe25cc34SXiubo Li 991fe25cc34SXiubo Li tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 992fe25cc34SXiubo Li 9937c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 9947c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 9957c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 9967c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 9977c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 9987c9e7a6fSAndy Grover 9997c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 10007c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10017c9e7a6fSAndy Grover 10027c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 10037c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 10047c9e7a6fSAndy Grover 10056fd0ce79SMike Christie return 0; 1006af1dd7ffSMike Christie 1007af1dd7ffSMike Christie queue: 1008af1dd7ffSMike Christie if (add_to_cmdr_queue(tcmu_cmd)) { 1009af1dd7ffSMike Christie *scsi_err = TCM_OUT_OF_RESOURCES; 1010af1dd7ffSMike Christie return -1; 1011af1dd7ffSMike Christie } 1012af1dd7ffSMike Christie 1013af1dd7ffSMike Christie return 1; 10147c9e7a6fSAndy Grover } 10157c9e7a6fSAndy Grover 101602eb924fSAndy Grover static sense_reason_t 101702eb924fSAndy Grover tcmu_queue_cmd(struct se_cmd *se_cmd) 10187c9e7a6fSAndy Grover { 1019af1dd7ffSMike Christie struct se_device *se_dev = se_cmd->se_dev; 1020af1dd7ffSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 10217c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 10226fd0ce79SMike Christie sense_reason_t scsi_ret; 1023af1dd7ffSMike Christie int ret; 10247c9e7a6fSAndy Grover 10257c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 10267c9e7a6fSAndy Grover if (!tcmu_cmd) 102702eb924fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10287c9e7a6fSAndy Grover 1029af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1030af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1031af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 1032af1dd7ffSMike Christie if (ret < 0) 1033141685a3SXiubo Li tcmu_free_cmd(tcmu_cmd); 10346fd0ce79SMike Christie return scsi_ret; 10357c9e7a6fSAndy Grover } 10367c9e7a6fSAndy Grover 10377c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 10387c9e7a6fSAndy Grover { 10397c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 10407c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 10417c9e7a6fSAndy Grover 1042b25c7863SSheng Yang /* 1043b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 10443d9b9555SAndy Grover * data area space and free cmd 1045b25c7863SSheng Yang */ 1046141685a3SXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 1047141685a3SXiubo Li goto out; 1048b25c7863SSheng Yang 1049141685a3SXiubo Li tcmu_cmd_reset_dbi_cur(cmd); 10507c9e7a6fSAndy Grover 10510ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 10520ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 10530ad46af8SAndy Grover cmd->se_cmd); 1054ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 1055ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 1056406f74c2SMike Christie transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); 1057e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 105826418649SSheng Yang /* Get Data-In buffer before clean up */ 1059a5d68ba8SXiubo Li gather_data_area(udev, cmd, true); 1060e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 1061a5d68ba8SXiubo Li gather_data_area(udev, cmd, false); 10627c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 1063141685a3SXiubo Li /* TODO: */ 10642bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 10652bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 10662bc396a2SIlias Tsitsimpis se_cmd->data_direction); 10677c9e7a6fSAndy Grover } 10687c9e7a6fSAndy Grover 10697c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 10707c9e7a6fSAndy Grover 1071141685a3SXiubo Li out: 1072141685a3SXiubo Li cmd->se_cmd = NULL; 1073b6df4b79SXiubo Li tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1074141685a3SXiubo Li tcmu_free_cmd(cmd); 10757c9e7a6fSAndy Grover } 10767c9e7a6fSAndy Grover 10777c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 10787c9e7a6fSAndy Grover { 10797c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 10807c9e7a6fSAndy Grover int handled = 0; 10817c9e7a6fSAndy Grover 10827c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 10837c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 10847c9e7a6fSAndy Grover return 0; 10857c9e7a6fSAndy Grover } 10867c9e7a6fSAndy Grover 10877c9e7a6fSAndy Grover mb = udev->mb_addr; 10887c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 10897c9e7a6fSAndy Grover 10906aa7de05SMark Rutland while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { 10917c9e7a6fSAndy Grover 10927c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 10937c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 10947c9e7a6fSAndy Grover 10957c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 10967c9e7a6fSAndy Grover 10970ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 10980ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 10990ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 11000ad46af8SAndy Grover udev->cmdr_size); 11017c9e7a6fSAndy Grover continue; 11027c9e7a6fSAndy Grover } 11030ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 11047c9e7a6fSAndy Grover 1105d3e709e6SMatthew Wilcox cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); 11067c9e7a6fSAndy Grover if (!cmd) { 110788cf1073SMike Christie pr_err("cmd_id %u not found, ring is broken\n", 110888cf1073SMike Christie entry->hdr.cmd_id); 11097c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 11107c9e7a6fSAndy Grover break; 11117c9e7a6fSAndy Grover } 11127c9e7a6fSAndy Grover 11137c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 11147c9e7a6fSAndy Grover 11150ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 11160ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 11170ad46af8SAndy Grover udev->cmdr_size); 11187c9e7a6fSAndy Grover 11197c9e7a6fSAndy Grover handled++; 11207c9e7a6fSAndy Grover } 11217c9e7a6fSAndy Grover 11229103575aSMike Christie if (mb->cmd_tail == mb->cmd_head) { 11239103575aSMike Christie /* no more pending commands */ 11249103575aSMike Christie del_timer(&udev->cmd_timer); 11259103575aSMike Christie 11269103575aSMike Christie if (list_empty(&udev->cmdr_queue)) { 1127af1dd7ffSMike Christie /* 11289103575aSMike Christie * no more pending or waiting commands so try to 11299103575aSMike Christie * reclaim blocks if needed. 1130af1dd7ffSMike Christie */ 11319103575aSMike Christie if (atomic_read(&global_db_count) > 113280eb8761SMike Christie tcmu_global_max_blocks) 1133af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 1134af1dd7ffSMike Christie } 11359103575aSMike Christie } 11367c9e7a6fSAndy Grover 11377c9e7a6fSAndy Grover return handled; 11387c9e7a6fSAndy Grover } 11397c9e7a6fSAndy Grover 11407c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 11417c9e7a6fSAndy Grover { 11427c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 1143af1dd7ffSMike Christie struct tcmu_dev *udev = cmd->tcmu_dev; 1144af1dd7ffSMike Christie u8 scsi_status; 1145af1dd7ffSMike Christie struct se_cmd *se_cmd; 1146af1dd7ffSMike Christie bool is_running; 11477c9e7a6fSAndy Grover 11487c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 11497c9e7a6fSAndy Grover return 0; 11507c9e7a6fSAndy Grover 1151611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 11527c9e7a6fSAndy Grover return 0; 11537c9e7a6fSAndy Grover 1154af1dd7ffSMike Christie is_running = list_empty(&cmd->cmdr_queue_entry); 11557c9e7a6fSAndy Grover 1156af1dd7ffSMike Christie if (is_running) { 11579103575aSMike Christie /* 11589103575aSMike Christie * If cmd_time_out is disabled but qfull is set deadline 11599103575aSMike Christie * will only reflect the qfull timeout. Ignore it. 11609103575aSMike Christie */ 11619103575aSMike Christie if (!udev->cmd_time_out) 11629103575aSMike Christie return 0; 11639103575aSMike Christie 1164af1dd7ffSMike Christie set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 1165af1dd7ffSMike Christie /* 1166af1dd7ffSMike Christie * target_complete_cmd will translate this to LUN COMM FAILURE 1167af1dd7ffSMike Christie */ 1168af1dd7ffSMike Christie scsi_status = SAM_STAT_CHECK_CONDITION; 1169af1dd7ffSMike Christie } else { 1170af1dd7ffSMike Christie list_del_init(&cmd->cmdr_queue_entry); 1171af1dd7ffSMike Christie 1172af1dd7ffSMike Christie idr_remove(&udev->commands, id); 1173af1dd7ffSMike Christie tcmu_free_cmd(cmd); 1174af1dd7ffSMike Christie scsi_status = SAM_STAT_TASK_SET_FULL; 1175af1dd7ffSMike Christie } 11769103575aSMike Christie 11779103575aSMike Christie pr_debug("Timing out cmd %u on dev %s that is %s.\n", 11789103575aSMike Christie id, udev->name, is_running ? "inflight" : "queued"); 11799103575aSMike Christie 11809103575aSMike Christie se_cmd = cmd->se_cmd; 11819103575aSMike Christie cmd->se_cmd = NULL; 1182af1dd7ffSMike Christie target_complete_cmd(se_cmd, scsi_status); 11837c9e7a6fSAndy Grover return 0; 11847c9e7a6fSAndy Grover } 11857c9e7a6fSAndy Grover 11869103575aSMike Christie static void tcmu_device_timedout(struct tcmu_dev *udev) 11877c9e7a6fSAndy Grover { 1188488ebe4cSMike Christie spin_lock(&timed_out_udevs_lock); 1189488ebe4cSMike Christie if (list_empty(&udev->timedout_entry)) 1190488ebe4cSMike Christie list_add_tail(&udev->timedout_entry, &timed_out_udevs); 1191488ebe4cSMike Christie spin_unlock(&timed_out_udevs_lock); 11927c9e7a6fSAndy Grover 1193af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, 0); 11947c9e7a6fSAndy Grover } 11957c9e7a6fSAndy Grover 11969103575aSMike Christie static void tcmu_cmd_timedout(struct timer_list *t) 11979103575aSMike Christie { 11989103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); 11999103575aSMike Christie 12009103575aSMike Christie pr_debug("%s cmd timeout has expired\n", udev->name); 12019103575aSMike Christie tcmu_device_timedout(udev); 12029103575aSMike Christie } 12039103575aSMike Christie 12049103575aSMike Christie static void tcmu_qfull_timedout(struct timer_list *t) 12059103575aSMike Christie { 12069103575aSMike Christie struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); 12079103575aSMike Christie 12089103575aSMike Christie pr_debug("%s qfull timeout has expired\n", udev->name); 12099103575aSMike Christie tcmu_device_timedout(udev); 12109103575aSMike Christie } 12119103575aSMike Christie 12127c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 12137c9e7a6fSAndy Grover { 12147c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 12157c9e7a6fSAndy Grover 12167c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 12177c9e7a6fSAndy Grover if (!tcmu_hba) 12187c9e7a6fSAndy Grover return -ENOMEM; 12197c9e7a6fSAndy Grover 12207c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 12217c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 12227c9e7a6fSAndy Grover 12237c9e7a6fSAndy Grover return 0; 12247c9e7a6fSAndy Grover } 12257c9e7a6fSAndy Grover 12267c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 12277c9e7a6fSAndy Grover { 12287c9e7a6fSAndy Grover kfree(hba->hba_ptr); 12297c9e7a6fSAndy Grover hba->hba_ptr = NULL; 12307c9e7a6fSAndy Grover } 12317c9e7a6fSAndy Grover 12327c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 12337c9e7a6fSAndy Grover { 12347c9e7a6fSAndy Grover struct tcmu_dev *udev; 12357c9e7a6fSAndy Grover 12367c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 12377c9e7a6fSAndy Grover if (!udev) 12387c9e7a6fSAndy Grover return NULL; 1239f3cdbe39SMike Christie kref_init(&udev->kref); 12407c9e7a6fSAndy Grover 12417c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 12427c9e7a6fSAndy Grover if (!udev->name) { 12437c9e7a6fSAndy Grover kfree(udev); 12447c9e7a6fSAndy Grover return NULL; 12457c9e7a6fSAndy Grover } 12467c9e7a6fSAndy Grover 12477c9e7a6fSAndy Grover udev->hba = hba; 1248af980e46SMike Christie udev->cmd_time_out = TCMU_TIME_OUT; 12499103575aSMike Christie udev->qfull_time_out = -1; 12507c9e7a6fSAndy Grover 125180eb8761SMike Christie udev->max_blocks = DATA_BLOCK_BITS_DEF; 1252b6df4b79SXiubo Li mutex_init(&udev->cmdr_lock); 12537c9e7a6fSAndy Grover 1254488ebe4cSMike Christie INIT_LIST_HEAD(&udev->timedout_entry); 1255af1dd7ffSMike Christie INIT_LIST_HEAD(&udev->cmdr_queue); 12567c9e7a6fSAndy Grover idr_init(&udev->commands); 12577c9e7a6fSAndy Grover 12589103575aSMike Christie timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); 12599103575aSMike Christie timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); 12607c9e7a6fSAndy Grover 1261b3af66e2SMike Christie init_waitqueue_head(&udev->nl_cmd_wq); 1262b3af66e2SMike Christie spin_lock_init(&udev->nl_cmd_lock); 1263b3af66e2SMike Christie 1264c22adc0bSXiubo Li INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); 1265c22adc0bSXiubo Li 12667c9e7a6fSAndy Grover return &udev->se_dev; 12677c9e7a6fSAndy Grover } 12687c9e7a6fSAndy Grover 1269892782caSMike Christie static bool run_cmdr_queue(struct tcmu_dev *udev, bool fail) 1270af1dd7ffSMike Christie { 1271af1dd7ffSMike Christie struct tcmu_cmd *tcmu_cmd, *tmp_cmd; 1272af1dd7ffSMike Christie LIST_HEAD(cmds); 1273af1dd7ffSMike Christie bool drained = true; 1274af1dd7ffSMike Christie sense_reason_t scsi_ret; 1275af1dd7ffSMike Christie int ret; 1276af1dd7ffSMike Christie 1277af1dd7ffSMike Christie if (list_empty(&udev->cmdr_queue)) 1278af1dd7ffSMike Christie return true; 1279af1dd7ffSMike Christie 1280892782caSMike Christie pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); 1281af1dd7ffSMike Christie 1282af1dd7ffSMike Christie list_splice_init(&udev->cmdr_queue, &cmds); 1283af1dd7ffSMike Christie 1284af1dd7ffSMike Christie list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, cmdr_queue_entry) { 1285af1dd7ffSMike Christie list_del_init(&tcmu_cmd->cmdr_queue_entry); 1286af1dd7ffSMike Christie 1287af1dd7ffSMike Christie pr_debug("removing cmd %u on dev %s from queue\n", 1288af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name); 1289af1dd7ffSMike Christie 1290892782caSMike Christie if (fail) { 1291892782caSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1292892782caSMike Christie /* 1293892782caSMike Christie * We were not able to even start the command, so 1294892782caSMike Christie * fail with busy to allow a retry in case runner 1295892782caSMike Christie * was only temporarily down. If the device is being 1296892782caSMike Christie * removed then LIO core will do the right thing and 1297892782caSMike Christie * fail the retry. 1298892782caSMike Christie */ 1299892782caSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); 1300892782caSMike Christie tcmu_free_cmd(tcmu_cmd); 1301892782caSMike Christie continue; 1302892782caSMike Christie } 1303892782caSMike Christie 1304af1dd7ffSMike Christie ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); 1305af1dd7ffSMike Christie if (ret < 0) { 1306af1dd7ffSMike Christie pr_debug("cmd %u on dev %s failed with %u\n", 1307af1dd7ffSMike Christie tcmu_cmd->cmd_id, udev->name, scsi_ret); 1308af1dd7ffSMike Christie 1309af1dd7ffSMike Christie idr_remove(&udev->commands, tcmu_cmd->cmd_id); 1310af1dd7ffSMike Christie /* 1311af1dd7ffSMike Christie * Ignore scsi_ret for now. target_complete_cmd 1312af1dd7ffSMike Christie * drops it. 1313af1dd7ffSMike Christie */ 1314af1dd7ffSMike Christie target_complete_cmd(tcmu_cmd->se_cmd, 1315af1dd7ffSMike Christie SAM_STAT_CHECK_CONDITION); 1316af1dd7ffSMike Christie tcmu_free_cmd(tcmu_cmd); 1317af1dd7ffSMike Christie } else if (ret > 0) { 1318af1dd7ffSMike Christie pr_debug("ran out of space during cmdr queue run\n"); 1319af1dd7ffSMike Christie /* 1320af1dd7ffSMike Christie * cmd was requeued, so just put all cmds back in 1321af1dd7ffSMike Christie * the queue 1322af1dd7ffSMike Christie */ 1323af1dd7ffSMike Christie list_splice_tail(&cmds, &udev->cmdr_queue); 1324af1dd7ffSMike Christie drained = false; 1325af1dd7ffSMike Christie goto done; 1326af1dd7ffSMike Christie } 1327af1dd7ffSMike Christie } 13289103575aSMike Christie if (list_empty(&udev->cmdr_queue)) 13299103575aSMike Christie del_timer(&udev->qfull_timer); 1330af1dd7ffSMike Christie done: 1331af1dd7ffSMike Christie return drained; 1332af1dd7ffSMike Christie } 1333af1dd7ffSMike Christie 13347c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 13357c9e7a6fSAndy Grover { 1336af1dd7ffSMike Christie struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 13377c9e7a6fSAndy Grover 1338af1dd7ffSMike Christie mutex_lock(&udev->cmdr_lock); 1339af1dd7ffSMike Christie tcmu_handle_completions(udev); 1340892782caSMike Christie run_cmdr_queue(udev, false); 1341af1dd7ffSMike Christie mutex_unlock(&udev->cmdr_lock); 13427c9e7a6fSAndy Grover 13437c9e7a6fSAndy Grover return 0; 13447c9e7a6fSAndy Grover } 13457c9e7a6fSAndy Grover 13467c9e7a6fSAndy Grover /* 13477c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 13487c9e7a6fSAndy Grover * and this stuff must come along. 13497c9e7a6fSAndy Grover */ 13507c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 13517c9e7a6fSAndy Grover { 13527c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 13537c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 13547c9e7a6fSAndy Grover 13557c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 13567c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 13577c9e7a6fSAndy Grover return -1; 13587c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 13597c9e7a6fSAndy Grover } 13607c9e7a6fSAndy Grover return -1; 13617c9e7a6fSAndy Grover } 13627c9e7a6fSAndy Grover 1363b6df4b79SXiubo Li static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 1364b6df4b79SXiubo Li { 1365b6df4b79SXiubo Li struct page *page; 1366b6df4b79SXiubo Li 1367b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 1368b6df4b79SXiubo Li page = tcmu_get_block_page(udev, dbi); 1369b6df4b79SXiubo Li if (likely(page)) { 1370b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1371b6df4b79SXiubo Li return page; 1372b6df4b79SXiubo Li } 1373b6df4b79SXiubo Li 1374b6df4b79SXiubo Li /* 1375c1c390baSMike Christie * Userspace messed up and passed in a address not in the 1376c1c390baSMike Christie * data iov passed to it. 1377b6df4b79SXiubo Li */ 1378c1c390baSMike Christie pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", 1379c1c390baSMike Christie dbi, udev->name); 1380c1c390baSMike Christie page = NULL; 1381b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 1382b6df4b79SXiubo Li 1383b6df4b79SXiubo Li return page; 1384b6df4b79SXiubo Li } 1385b6df4b79SXiubo Li 138611bac800SDave Jiang static int tcmu_vma_fault(struct vm_fault *vmf) 13877c9e7a6fSAndy Grover { 138811bac800SDave Jiang struct tcmu_dev *udev = vmf->vma->vm_private_data; 13897c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 13907c9e7a6fSAndy Grover struct page *page; 13917c9e7a6fSAndy Grover unsigned long offset; 13927c9e7a6fSAndy Grover void *addr; 13937c9e7a6fSAndy Grover 139411bac800SDave Jiang int mi = tcmu_find_mem_index(vmf->vma); 13957c9e7a6fSAndy Grover if (mi < 0) 13967c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 13977c9e7a6fSAndy Grover 13987c9e7a6fSAndy Grover /* 13997c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 14007c9e7a6fSAndy Grover * to use mem[N]. 14017c9e7a6fSAndy Grover */ 14027c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 14037c9e7a6fSAndy Grover 1404141685a3SXiubo Li if (offset < udev->data_off) { 1405141685a3SXiubo Li /* For the vmalloc()ed cmd area pages */ 14067c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 14077c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 1408141685a3SXiubo Li } else { 1409141685a3SXiubo Li uint32_t dbi; 1410141685a3SXiubo Li 1411b6df4b79SXiubo Li /* For the dynamically growing data area pages */ 1412141685a3SXiubo Li dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; 1413b6df4b79SXiubo Li page = tcmu_try_get_block_page(udev, dbi); 1414b6df4b79SXiubo Li if (!page) 1415c1c390baSMike Christie return VM_FAULT_SIGBUS; 1416141685a3SXiubo Li } 1417141685a3SXiubo Li 14187c9e7a6fSAndy Grover get_page(page); 14197c9e7a6fSAndy Grover vmf->page = page; 14207c9e7a6fSAndy Grover return 0; 14217c9e7a6fSAndy Grover } 14227c9e7a6fSAndy Grover 14237c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 14247c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 14257c9e7a6fSAndy Grover }; 14267c9e7a6fSAndy Grover 14277c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 14287c9e7a6fSAndy Grover { 14297c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14307c9e7a6fSAndy Grover 14317c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 14327c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 14337c9e7a6fSAndy Grover 14347c9e7a6fSAndy Grover vma->vm_private_data = udev; 14357c9e7a6fSAndy Grover 14367c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 143780eb8761SMike Christie if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) 14387c9e7a6fSAndy Grover return -EINVAL; 14397c9e7a6fSAndy Grover 14407c9e7a6fSAndy Grover return 0; 14417c9e7a6fSAndy Grover } 14427c9e7a6fSAndy Grover 14437c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 14447c9e7a6fSAndy Grover { 14457c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 14467c9e7a6fSAndy Grover 14477c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 14487c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 14497c9e7a6fSAndy Grover return -EBUSY; 14507c9e7a6fSAndy Grover 1451b6df4b79SXiubo Li udev->inode = inode; 14529260695dSMike Christie kref_get(&udev->kref); 1453b6df4b79SXiubo Li 14547c9e7a6fSAndy Grover pr_debug("open\n"); 14557c9e7a6fSAndy Grover 14567c9e7a6fSAndy Grover return 0; 14577c9e7a6fSAndy Grover } 14587c9e7a6fSAndy Grover 1459f3cdbe39SMike Christie static void tcmu_dev_call_rcu(struct rcu_head *p) 1460f3cdbe39SMike Christie { 1461f3cdbe39SMike Christie struct se_device *dev = container_of(p, struct se_device, rcu_head); 1462f3cdbe39SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 1463f3cdbe39SMike Christie 1464f3cdbe39SMike Christie kfree(udev->uio_info.name); 1465f3cdbe39SMike Christie kfree(udev->name); 1466f3cdbe39SMike Christie kfree(udev); 1467f3cdbe39SMike Christie } 1468f3cdbe39SMike Christie 1469c22adc0bSXiubo Li static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 1470c22adc0bSXiubo Li { 1471c22adc0bSXiubo Li if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1472c22adc0bSXiubo Li kmem_cache_free(tcmu_cmd_cache, cmd); 1473c22adc0bSXiubo Li return 0; 1474c22adc0bSXiubo Li } 1475c22adc0bSXiubo Li return -EINVAL; 1476c22adc0bSXiubo Li } 1477c22adc0bSXiubo Li 1478bf99ec13SMike Christie static void tcmu_blocks_release(struct radix_tree_root *blocks, 1479bf99ec13SMike Christie int start, int end) 1480c22adc0bSXiubo Li { 1481c22adc0bSXiubo Li int i; 1482c22adc0bSXiubo Li struct page *page; 1483c22adc0bSXiubo Li 1484bf99ec13SMike Christie for (i = start; i < end; i++) { 1485bf99ec13SMike Christie page = radix_tree_delete(blocks, i); 1486c22adc0bSXiubo Li if (page) { 1487c22adc0bSXiubo Li __free_page(page); 1488c22adc0bSXiubo Li atomic_dec(&global_db_count); 1489c22adc0bSXiubo Li } 1490c22adc0bSXiubo Li } 1491c22adc0bSXiubo Li } 1492c22adc0bSXiubo Li 1493f3cdbe39SMike Christie static void tcmu_dev_kref_release(struct kref *kref) 1494f3cdbe39SMike Christie { 1495f3cdbe39SMike Christie struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); 1496f3cdbe39SMike Christie struct se_device *dev = &udev->se_dev; 1497c22adc0bSXiubo Li struct tcmu_cmd *cmd; 1498c22adc0bSXiubo Li bool all_expired = true; 1499c22adc0bSXiubo Li int i; 1500c22adc0bSXiubo Li 1501c22adc0bSXiubo Li vfree(udev->mb_addr); 1502c22adc0bSXiubo Li udev->mb_addr = NULL; 1503c22adc0bSXiubo Li 1504488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 1505488ebe4cSMike Christie if (!list_empty(&udev->timedout_entry)) 1506488ebe4cSMike Christie list_del(&udev->timedout_entry); 1507488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 1508488ebe4cSMike Christie 1509c22adc0bSXiubo Li /* Upper layer should drain all requests before calling this */ 15106fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 1511c22adc0bSXiubo Li idr_for_each_entry(&udev->commands, cmd, i) { 1512c22adc0bSXiubo Li if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1513c22adc0bSXiubo Li all_expired = false; 1514c22adc0bSXiubo Li } 1515c22adc0bSXiubo Li idr_destroy(&udev->commands); 1516c22adc0bSXiubo Li WARN_ON(!all_expired); 1517c22adc0bSXiubo Li 1518bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); 151980eb8761SMike Christie kfree(udev->data_bitmap); 1520bf99ec13SMike Christie mutex_unlock(&udev->cmdr_lock); 1521f3cdbe39SMike Christie 1522f3cdbe39SMike Christie call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 1523f3cdbe39SMike Christie } 1524f3cdbe39SMike Christie 15257c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 15267c9e7a6fSAndy Grover { 15277c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 15287c9e7a6fSAndy Grover 15297c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 15307c9e7a6fSAndy Grover 15317c9e7a6fSAndy Grover pr_debug("close\n"); 15329260695dSMike Christie /* release ref from open */ 1533f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 15347c9e7a6fSAndy Grover return 0; 15357c9e7a6fSAndy Grover } 15367c9e7a6fSAndy Grover 1537b3af66e2SMike Christie static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) 1538b3af66e2SMike Christie { 1539b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1540b3af66e2SMike Christie 1541b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1542b3af66e2SMike Christie return; 1543b849b456SKenjiro Nakayama 1544b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1545b849b456SKenjiro Nakayama return; 1546b849b456SKenjiro Nakayama 1547b3af66e2SMike Christie relock: 1548b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 1549b3af66e2SMike Christie 1550b3af66e2SMike Christie if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { 1551b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1552b3af66e2SMike Christie pr_debug("sleeping for open nl cmd\n"); 1553b3af66e2SMike Christie wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); 1554b3af66e2SMike Christie goto relock; 1555b3af66e2SMike Christie } 1556b3af66e2SMike Christie 1557b3af66e2SMike Christie memset(nl_cmd, 0, sizeof(*nl_cmd)); 1558b3af66e2SMike Christie nl_cmd->cmd = cmd; 1559b3af66e2SMike Christie init_completion(&nl_cmd->complete); 1560b3af66e2SMike Christie 1561b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1562b3af66e2SMike Christie } 1563b3af66e2SMike Christie 1564b3af66e2SMike Christie static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) 1565b3af66e2SMike Christie { 1566b3af66e2SMike Christie struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; 1567b3af66e2SMike Christie int ret; 1568b3af66e2SMike Christie DEFINE_WAIT(__wait); 1569b3af66e2SMike Christie 1570b3af66e2SMike Christie if (!tcmu_kern_cmd_reply_supported) 1571b3af66e2SMike Christie return 0; 1572b3af66e2SMike Christie 1573b849b456SKenjiro Nakayama if (udev->nl_reply_supported <= 0) 1574b849b456SKenjiro Nakayama return 0; 1575b849b456SKenjiro Nakayama 1576b3af66e2SMike Christie pr_debug("sleeping for nl reply\n"); 1577b3af66e2SMike Christie wait_for_completion(&nl_cmd->complete); 1578b3af66e2SMike Christie 1579b3af66e2SMike Christie spin_lock(&udev->nl_cmd_lock); 1580b3af66e2SMike Christie nl_cmd->cmd = TCMU_CMD_UNSPEC; 1581b3af66e2SMike Christie ret = nl_cmd->status; 1582b3af66e2SMike Christie nl_cmd->status = 0; 1583b3af66e2SMike Christie spin_unlock(&udev->nl_cmd_lock); 1584b3af66e2SMike Christie 1585b3af66e2SMike Christie wake_up_all(&udev->nl_cmd_wq); 1586b3af66e2SMike Christie 1587b3af66e2SMike Christie return ret;; 1588b3af66e2SMike Christie } 1589b3af66e2SMike Christie 1590b3af66e2SMike Christie static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, 1591b3af66e2SMike Christie int reconfig_attr, const void *reconfig_data) 15927c9e7a6fSAndy Grover { 15937c9e7a6fSAndy Grover struct sk_buff *skb; 15947c9e7a6fSAndy Grover void *msg_header; 15956e14eab9SNicholas Bellinger int ret = -ENOMEM; 15967c9e7a6fSAndy Grover 15977c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 15987c9e7a6fSAndy Grover if (!skb) 15996e14eab9SNicholas Bellinger return ret; 16007c9e7a6fSAndy Grover 16017c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 16026e14eab9SNicholas Bellinger if (!msg_header) 16036e14eab9SNicholas Bellinger goto free_skb; 16047c9e7a6fSAndy Grover 1605b3af66e2SMike Christie ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); 16066e14eab9SNicholas Bellinger if (ret < 0) 16076e14eab9SNicholas Bellinger goto free_skb; 16087c9e7a6fSAndy Grover 1609b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); 1610b3af66e2SMike Christie if (ret < 0) 1611b3af66e2SMike Christie goto free_skb; 1612b3af66e2SMike Christie 1613b3af66e2SMike Christie ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); 16146e14eab9SNicholas Bellinger if (ret < 0) 16156e14eab9SNicholas Bellinger goto free_skb; 16167c9e7a6fSAndy Grover 16172d76443eSMike Christie if (cmd == TCMU_CMD_RECONFIG_DEVICE) { 16182d76443eSMike Christie switch (reconfig_attr) { 16192d76443eSMike Christie case TCMU_ATTR_DEV_CFG: 16202d76443eSMike Christie ret = nla_put_string(skb, reconfig_attr, reconfig_data); 16212d76443eSMike Christie break; 16222d76443eSMike Christie case TCMU_ATTR_DEV_SIZE: 16232d76443eSMike Christie ret = nla_put_u64_64bit(skb, reconfig_attr, 16242d76443eSMike Christie *((u64 *)reconfig_data), 16252d76443eSMike Christie TCMU_ATTR_PAD); 16262d76443eSMike Christie break; 16272d76443eSMike Christie case TCMU_ATTR_WRITECACHE: 16282d76443eSMike Christie ret = nla_put_u8(skb, reconfig_attr, 16292d76443eSMike Christie *((u8 *)reconfig_data)); 16302d76443eSMike Christie break; 16312d76443eSMike Christie default: 16322d76443eSMike Christie BUG(); 16332d76443eSMike Christie } 16342d76443eSMike Christie 16358a45885cSBryant G. Ly if (ret < 0) 16368a45885cSBryant G. Ly goto free_skb; 16372d76443eSMike Christie } 16388a45885cSBryant G. Ly 1639053c095aSJohannes Berg genlmsg_end(skb, msg_header); 16407c9e7a6fSAndy Grover 1641b3af66e2SMike Christie tcmu_init_genl_cmd_reply(udev, cmd); 1642b3af66e2SMike Christie 164320c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 16447c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 16457c9e7a6fSAndy Grover /* We don't care if no one is listening */ 16467c9e7a6fSAndy Grover if (ret == -ESRCH) 16477c9e7a6fSAndy Grover ret = 0; 1648b3af66e2SMike Christie if (!ret) 1649b3af66e2SMike Christie ret = tcmu_wait_genl_cmd_reply(udev); 16507c9e7a6fSAndy Grover 16517c9e7a6fSAndy Grover return ret; 16526e14eab9SNicholas Bellinger free_skb: 16536e14eab9SNicholas Bellinger nlmsg_free(skb); 16546e14eab9SNicholas Bellinger return ret; 16557c9e7a6fSAndy Grover } 16567c9e7a6fSAndy Grover 1657de8c5221SBryant G. Ly static int tcmu_update_uio_info(struct tcmu_dev *udev) 16587c9e7a6fSAndy Grover { 16597c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 16607c9e7a6fSAndy Grover struct uio_info *info; 1661de8c5221SBryant G. Ly size_t size, used; 16627c9e7a6fSAndy Grover char *str; 16637c9e7a6fSAndy Grover 16647c9e7a6fSAndy Grover info = &udev->uio_info; 16657c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 16667c9e7a6fSAndy Grover udev->dev_config); 16677c9e7a6fSAndy Grover size += 1; /* for \0 */ 16687c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 16697c9e7a6fSAndy Grover if (!str) 16707c9e7a6fSAndy Grover return -ENOMEM; 16717c9e7a6fSAndy Grover 16727c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 16737c9e7a6fSAndy Grover if (udev->dev_config[0]) 16747c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 16757c9e7a6fSAndy Grover 1676ededd039SBryant G. Ly /* If the old string exists, free it */ 1677ededd039SBryant G. Ly kfree(info->name); 16787c9e7a6fSAndy Grover info->name = str; 16797c9e7a6fSAndy Grover 1680de8c5221SBryant G. Ly return 0; 1681de8c5221SBryant G. Ly } 1682de8c5221SBryant G. Ly 1683de8c5221SBryant G. Ly static int tcmu_configure_device(struct se_device *dev) 1684de8c5221SBryant G. Ly { 1685de8c5221SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(dev); 1686de8c5221SBryant G. Ly struct uio_info *info; 1687de8c5221SBryant G. Ly struct tcmu_mailbox *mb; 1688de8c5221SBryant G. Ly int ret = 0; 1689de8c5221SBryant G. Ly 1690de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 1691de8c5221SBryant G. Ly if (ret) 1692de8c5221SBryant G. Ly return ret; 1693de8c5221SBryant G. Ly 1694de8c5221SBryant G. Ly info = &udev->uio_info; 1695de8c5221SBryant G. Ly 169680eb8761SMike Christie udev->data_bitmap = kzalloc(BITS_TO_LONGS(udev->max_blocks) * 169780eb8761SMike Christie sizeof(unsigned long), GFP_KERNEL); 1698a24e7917SWei Yongjun if (!udev->data_bitmap) { 1699a24e7917SWei Yongjun ret = -ENOMEM; 170080eb8761SMike Christie goto err_bitmap_alloc; 1701a24e7917SWei Yongjun } 170280eb8761SMike Christie 1703141685a3SXiubo Li udev->mb_addr = vzalloc(CMDR_SIZE); 17047c9e7a6fSAndy Grover if (!udev->mb_addr) { 17057c9e7a6fSAndy Grover ret = -ENOMEM; 17067c9e7a6fSAndy Grover goto err_vzalloc; 17077c9e7a6fSAndy Grover } 17087c9e7a6fSAndy Grover 17097c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 17107c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 17117c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 171280eb8761SMike Christie udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; 1713b6df4b79SXiubo Li udev->dbi_thresh = 0; /* Default in Idle state */ 17147c9e7a6fSAndy Grover 1715141685a3SXiubo Li /* Initialise the mailbox of the ring buffer */ 17167c9e7a6fSAndy Grover mb = udev->mb_addr; 17170ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 171832c76de3SSheng Yang mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; 17197c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 17207c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 17217c9e7a6fSAndy Grover 17227c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 17237c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 172426418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 17257c9e7a6fSAndy Grover 1726ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 17277c9e7a6fSAndy Grover 17287c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 17290633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 173080eb8761SMike Christie info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; 1731141685a3SXiubo Li info->mem[0].memtype = UIO_MEM_NONE; 17327c9e7a6fSAndy Grover 17337c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 17347c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 17357c9e7a6fSAndy Grover 17367c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 17377c9e7a6fSAndy Grover info->open = tcmu_open; 17387c9e7a6fSAndy Grover info->release = tcmu_release; 17397c9e7a6fSAndy Grover 17407c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 17417c9e7a6fSAndy Grover if (ret) 17427c9e7a6fSAndy Grover goto err_register; 17437c9e7a6fSAndy Grover 174481ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 174581ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 17467c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 174781ee28deSSheng Yang /* Other attributes can be configured in userspace */ 17483abaa2bfSMike Christie if (!dev->dev_attrib.hw_max_sectors) 17497c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 17509a8bb606SBryant G. Ly if (!dev->dev_attrib.emulate_write_cache) 17519a8bb606SBryant G. Ly dev->dev_attrib.emulate_write_cache = 0; 17527c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 17537c9e7a6fSAndy Grover 1754b849b456SKenjiro Nakayama /* If user didn't explicitly disable netlink reply support, use 1755b849b456SKenjiro Nakayama * module scope setting. 1756b849b456SKenjiro Nakayama */ 1757b849b456SKenjiro Nakayama if (udev->nl_reply_supported >= 0) 1758b849b456SKenjiro Nakayama udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; 1759b849b456SKenjiro Nakayama 1760f3cdbe39SMike Christie /* 1761f3cdbe39SMike Christie * Get a ref incase userspace does a close on the uio device before 1762f3cdbe39SMike Christie * LIO has initiated tcmu_free_device. 1763f3cdbe39SMike Christie */ 1764f3cdbe39SMike Christie kref_get(&udev->kref); 1765f3cdbe39SMike Christie 1766b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); 17677c9e7a6fSAndy Grover if (ret) 17687c9e7a6fSAndy Grover goto err_netlink; 17697c9e7a6fSAndy Grover 1770b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1771b6df4b79SXiubo Li list_add(&udev->node, &root_udev); 1772b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1773b6df4b79SXiubo Li 17747c9e7a6fSAndy Grover return 0; 17757c9e7a6fSAndy Grover 17767c9e7a6fSAndy Grover err_netlink: 1777f3cdbe39SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 17787c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 17797c9e7a6fSAndy Grover err_register: 17807c9e7a6fSAndy Grover vfree(udev->mb_addr); 1781c22adc0bSXiubo Li udev->mb_addr = NULL; 17827c9e7a6fSAndy Grover err_vzalloc: 178380eb8761SMike Christie kfree(udev->data_bitmap); 178480eb8761SMike Christie udev->data_bitmap = NULL; 178580eb8761SMike Christie err_bitmap_alloc: 17867c9e7a6fSAndy Grover kfree(info->name); 1787f3cdbe39SMike Christie info->name = NULL; 17887c9e7a6fSAndy Grover 17897c9e7a6fSAndy Grover return ret; 17907c9e7a6fSAndy Grover } 17917c9e7a6fSAndy Grover 1792972c7f16SMike Christie static bool tcmu_dev_configured(struct tcmu_dev *udev) 1793972c7f16SMike Christie { 1794972c7f16SMike Christie return udev->uio_info.uio_dev ? true : false; 1795972c7f16SMike Christie } 1796972c7f16SMike Christie 17977c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 17987c9e7a6fSAndy Grover { 17997c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 180092634706SMike Christie 180192634706SMike Christie /* release ref from init */ 180292634706SMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 180392634706SMike Christie } 180492634706SMike Christie 180592634706SMike Christie static void tcmu_destroy_device(struct se_device *dev) 180692634706SMike Christie { 180792634706SMike Christie struct tcmu_dev *udev = TCMU_DEV(dev); 18087c9e7a6fSAndy Grover 18099103575aSMike Christie del_timer_sync(&udev->cmd_timer); 18109103575aSMike Christie del_timer_sync(&udev->qfull_timer); 18117c9e7a6fSAndy Grover 1812b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 1813b6df4b79SXiubo Li list_del(&udev->node); 1814b6df4b79SXiubo Li mutex_unlock(&root_udev_mutex); 1815b6df4b79SXiubo Li 1816b3af66e2SMike Christie tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); 18177c9e7a6fSAndy Grover 18187c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 18199260695dSMike Christie 18209260695dSMike Christie /* release ref from configure */ 18219260695dSMike Christie kref_put(&udev->kref, tcmu_dev_kref_release); 18227c9e7a6fSAndy Grover } 18237c9e7a6fSAndy Grover 1824892782caSMike Christie static void tcmu_unblock_dev(struct tcmu_dev *udev) 1825892782caSMike Christie { 1826892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1827892782caSMike Christie clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); 1828892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 1829892782caSMike Christie } 1830892782caSMike Christie 1831892782caSMike Christie static void tcmu_block_dev(struct tcmu_dev *udev) 1832892782caSMike Christie { 1833892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1834892782caSMike Christie 1835892782caSMike Christie if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 1836892782caSMike Christie goto unlock; 1837892782caSMike Christie 1838892782caSMike Christie /* complete IO that has executed successfully */ 1839892782caSMike Christie tcmu_handle_completions(udev); 1840892782caSMike Christie /* fail IO waiting to be queued */ 1841892782caSMike Christie run_cmdr_queue(udev, true); 1842892782caSMike Christie 1843892782caSMike Christie unlock: 1844892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 1845892782caSMike Christie } 1846892782caSMike Christie 1847892782caSMike Christie static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) 1848892782caSMike Christie { 1849892782caSMike Christie struct tcmu_mailbox *mb; 1850892782caSMike Christie struct tcmu_cmd *cmd; 1851892782caSMike Christie int i; 1852892782caSMike Christie 1853892782caSMike Christie mutex_lock(&udev->cmdr_lock); 1854892782caSMike Christie 1855892782caSMike Christie idr_for_each_entry(&udev->commands, cmd, i) { 1856892782caSMike Christie if (!list_empty(&cmd->cmdr_queue_entry)) 1857892782caSMike Christie continue; 1858892782caSMike Christie 1859892782caSMike Christie pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", 1860892782caSMike Christie cmd->cmd_id, udev->name, 1861892782caSMike Christie test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); 1862892782caSMike Christie 1863892782caSMike Christie idr_remove(&udev->commands, i); 1864892782caSMike Christie if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 1865892782caSMike Christie if (err_level == 1) { 1866892782caSMike Christie /* 1867892782caSMike Christie * Userspace was not able to start the 1868892782caSMike Christie * command or it is retryable. 1869892782caSMike Christie */ 1870892782caSMike Christie target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); 1871892782caSMike Christie } else { 1872892782caSMike Christie /* hard failure */ 1873892782caSMike Christie target_complete_cmd(cmd->se_cmd, 1874892782caSMike Christie SAM_STAT_CHECK_CONDITION); 1875892782caSMike Christie } 1876892782caSMike Christie } 1877892782caSMike Christie tcmu_cmd_free_data(cmd, cmd->dbi_cnt); 1878892782caSMike Christie tcmu_free_cmd(cmd); 1879892782caSMike Christie } 1880892782caSMike Christie 1881892782caSMike Christie mb = udev->mb_addr; 1882892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 1883892782caSMike Christie pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, 1884892782caSMike Christie mb->cmd_tail, mb->cmd_head); 1885892782caSMike Christie 1886892782caSMike Christie udev->cmdr_last_cleaned = 0; 1887892782caSMike Christie mb->cmd_tail = 0; 1888892782caSMike Christie mb->cmd_head = 0; 1889892782caSMike Christie tcmu_flush_dcache_range(mb, sizeof(*mb)); 1890892782caSMike Christie 1891892782caSMike Christie del_timer(&udev->cmd_timer); 1892892782caSMike Christie 1893892782caSMike Christie mutex_unlock(&udev->cmdr_lock); 1894892782caSMike Christie } 1895892782caSMike Christie 18967c9e7a6fSAndy Grover enum { 18973abaa2bfSMike Christie Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, 189880eb8761SMike Christie Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, 18997c9e7a6fSAndy Grover }; 19007c9e7a6fSAndy Grover 19017c9e7a6fSAndy Grover static match_table_t tokens = { 19027c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 19037c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 19049c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 19053abaa2bfSMike Christie {Opt_hw_max_sectors, "hw_max_sectors=%u"}, 1906b849b456SKenjiro Nakayama {Opt_nl_reply_supported, "nl_reply_supported=%d"}, 190780eb8761SMike Christie {Opt_max_data_area_mb, "max_data_area_mb=%u"}, 19087c9e7a6fSAndy Grover {Opt_err, NULL} 19097c9e7a6fSAndy Grover }; 19107c9e7a6fSAndy Grover 19113abaa2bfSMike Christie static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) 19123abaa2bfSMike Christie { 19133abaa2bfSMike Christie unsigned long tmp_ul; 19143abaa2bfSMike Christie char *arg_p; 19153abaa2bfSMike Christie int ret; 19163abaa2bfSMike Christie 19173abaa2bfSMike Christie arg_p = match_strdup(arg); 19183abaa2bfSMike Christie if (!arg_p) 19193abaa2bfSMike Christie return -ENOMEM; 19203abaa2bfSMike Christie 19213abaa2bfSMike Christie ret = kstrtoul(arg_p, 0, &tmp_ul); 19223abaa2bfSMike Christie kfree(arg_p); 19233abaa2bfSMike Christie if (ret < 0) { 19243abaa2bfSMike Christie pr_err("kstrtoul() failed for dev attrib\n"); 19253abaa2bfSMike Christie return ret; 19263abaa2bfSMike Christie } 19273abaa2bfSMike Christie if (!tmp_ul) { 19283abaa2bfSMike Christie pr_err("dev attrib must be nonzero\n"); 19293abaa2bfSMike Christie return -EINVAL; 19303abaa2bfSMike Christie } 19313abaa2bfSMike Christie *dev_attrib = tmp_ul; 19323abaa2bfSMike Christie return 0; 19333abaa2bfSMike Christie } 19343abaa2bfSMike Christie 19357c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 19367c9e7a6fSAndy Grover const char *page, ssize_t count) 19377c9e7a6fSAndy Grover { 19387c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 19397c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 19407c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 194180eb8761SMike Christie int ret = 0, token, tmpval; 19427c9e7a6fSAndy Grover 19437c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 19447c9e7a6fSAndy Grover if (!opts) 19457c9e7a6fSAndy Grover return -ENOMEM; 19467c9e7a6fSAndy Grover 19477c9e7a6fSAndy Grover orig = opts; 19487c9e7a6fSAndy Grover 19497c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 19507c9e7a6fSAndy Grover if (!*ptr) 19517c9e7a6fSAndy Grover continue; 19527c9e7a6fSAndy Grover 19537c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 19547c9e7a6fSAndy Grover switch (token) { 19557c9e7a6fSAndy Grover case Opt_dev_config: 19567c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 19577c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 19587c9e7a6fSAndy Grover ret = -EINVAL; 19597c9e7a6fSAndy Grover break; 19607c9e7a6fSAndy Grover } 19617c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 19627c9e7a6fSAndy Grover break; 19637c9e7a6fSAndy Grover case Opt_dev_size: 19647c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 19657c9e7a6fSAndy Grover if (!arg_p) { 19667c9e7a6fSAndy Grover ret = -ENOMEM; 19677c9e7a6fSAndy Grover break; 19687c9e7a6fSAndy Grover } 19697c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 19707c9e7a6fSAndy Grover kfree(arg_p); 19717c9e7a6fSAndy Grover if (ret < 0) 19727c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 19737c9e7a6fSAndy Grover break; 19749c1cd1b6SAndy Grover case Opt_hw_block_size: 19753abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 19763abaa2bfSMike Christie &(dev->dev_attrib.hw_block_size)); 19779c1cd1b6SAndy Grover break; 19783abaa2bfSMike Christie case Opt_hw_max_sectors: 19793abaa2bfSMike Christie ret = tcmu_set_dev_attrib(&args[0], 19803abaa2bfSMike Christie &(dev->dev_attrib.hw_max_sectors)); 19819c1cd1b6SAndy Grover break; 1982b849b456SKenjiro Nakayama case Opt_nl_reply_supported: 1983b849b456SKenjiro Nakayama arg_p = match_strdup(&args[0]); 1984b849b456SKenjiro Nakayama if (!arg_p) { 1985b849b456SKenjiro Nakayama ret = -ENOMEM; 1986b849b456SKenjiro Nakayama break; 1987b849b456SKenjiro Nakayama } 198816b93277SDan Carpenter ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported); 1989b849b456SKenjiro Nakayama kfree(arg_p); 1990b849b456SKenjiro Nakayama if (ret < 0) 199116b93277SDan Carpenter pr_err("kstrtoint() failed for nl_reply_supported=\n"); 1992b849b456SKenjiro Nakayama break; 199380eb8761SMike Christie case Opt_max_data_area_mb: 199480eb8761SMike Christie if (dev->export_count) { 199580eb8761SMike Christie pr_err("Unable to set max_data_area_mb while exports exist\n"); 199680eb8761SMike Christie ret = -EINVAL; 199780eb8761SMike Christie break; 199880eb8761SMike Christie } 199980eb8761SMike Christie 200080eb8761SMike Christie arg_p = match_strdup(&args[0]); 200180eb8761SMike Christie if (!arg_p) { 200280eb8761SMike Christie ret = -ENOMEM; 200380eb8761SMike Christie break; 200480eb8761SMike Christie } 200580eb8761SMike Christie ret = kstrtoint(arg_p, 0, &tmpval); 200680eb8761SMike Christie kfree(arg_p); 200780eb8761SMike Christie if (ret < 0) { 200880eb8761SMike Christie pr_err("kstrtoint() failed for max_data_area_mb=\n"); 200980eb8761SMike Christie break; 201080eb8761SMike Christie } 201180eb8761SMike Christie 201280eb8761SMike Christie if (tmpval <= 0) { 201380eb8761SMike Christie pr_err("Invalid max_data_area %d\n", tmpval); 201480eb8761SMike Christie ret = -EINVAL; 201580eb8761SMike Christie break; 201680eb8761SMike Christie } 201780eb8761SMike Christie 201880eb8761SMike Christie udev->max_blocks = TCMU_MBS_TO_BLOCKS(tmpval); 201980eb8761SMike Christie if (udev->max_blocks > tcmu_global_max_blocks) { 202080eb8761SMike Christie pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", 202180eb8761SMike Christie tmpval, 202280eb8761SMike Christie TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); 202380eb8761SMike Christie udev->max_blocks = tcmu_global_max_blocks; 202480eb8761SMike Christie } 202580eb8761SMike Christie break; 20267c9e7a6fSAndy Grover default: 20277c9e7a6fSAndy Grover break; 20287c9e7a6fSAndy Grover } 20292579325cSMike Christie 20302579325cSMike Christie if (ret) 20312579325cSMike Christie break; 20327c9e7a6fSAndy Grover } 20337c9e7a6fSAndy Grover 20347c9e7a6fSAndy Grover kfree(orig); 20357c9e7a6fSAndy Grover return (!ret) ? count : ret; 20367c9e7a6fSAndy Grover } 20377c9e7a6fSAndy Grover 20387c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 20397c9e7a6fSAndy Grover { 20407c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 20417c9e7a6fSAndy Grover ssize_t bl = 0; 20427c9e7a6fSAndy Grover 20437c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 20447c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 204580eb8761SMike Christie bl += sprintf(b + bl, "Size: %zu ", udev->dev_size); 204680eb8761SMike Christie bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", 204780eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 20487c9e7a6fSAndy Grover 20497c9e7a6fSAndy Grover return bl; 20507c9e7a6fSAndy Grover } 20517c9e7a6fSAndy Grover 20527c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 20537c9e7a6fSAndy Grover { 20547c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 20557c9e7a6fSAndy Grover 20567c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 20577c9e7a6fSAndy Grover dev->dev_attrib.block_size); 20587c9e7a6fSAndy Grover } 20597c9e7a6fSAndy Grover 20607c9e7a6fSAndy Grover static sense_reason_t 20617c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 20627c9e7a6fSAndy Grover { 206302eb924fSAndy Grover return passthrough_parse_cdb(cmd, tcmu_queue_cmd); 20649c1cd1b6SAndy Grover } 20659c1cd1b6SAndy Grover 20667d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) 20677d7a7435SNicholas Bellinger { 20687d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 20697d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 2070b5ab697cSKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 20717d7a7435SNicholas Bellinger 20727d7a7435SNicholas Bellinger return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); 20737d7a7435SNicholas Bellinger } 20747d7a7435SNicholas Bellinger 20757d7a7435SNicholas Bellinger static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, 20767d7a7435SNicholas Bellinger size_t count) 20777d7a7435SNicholas Bellinger { 20787d7a7435SNicholas Bellinger struct se_dev_attrib *da = container_of(to_config_group(item), 20797d7a7435SNicholas Bellinger struct se_dev_attrib, da_group); 20807d7a7435SNicholas Bellinger struct tcmu_dev *udev = container_of(da->da_dev, 20817d7a7435SNicholas Bellinger struct tcmu_dev, se_dev); 20827d7a7435SNicholas Bellinger u32 val; 20837d7a7435SNicholas Bellinger int ret; 20847d7a7435SNicholas Bellinger 20857d7a7435SNicholas Bellinger if (da->da_dev->export_count) { 20867d7a7435SNicholas Bellinger pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); 20877d7a7435SNicholas Bellinger return -EINVAL; 20887d7a7435SNicholas Bellinger } 20897d7a7435SNicholas Bellinger 20907d7a7435SNicholas Bellinger ret = kstrtou32(page, 0, &val); 20917d7a7435SNicholas Bellinger if (ret < 0) 20927d7a7435SNicholas Bellinger return ret; 20937d7a7435SNicholas Bellinger 20947d7a7435SNicholas Bellinger udev->cmd_time_out = val * MSEC_PER_SEC; 20957d7a7435SNicholas Bellinger return count; 20967d7a7435SNicholas Bellinger } 20977d7a7435SNicholas Bellinger CONFIGFS_ATTR(tcmu_, cmd_time_out); 20987d7a7435SNicholas Bellinger 20999103575aSMike Christie static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) 21009103575aSMike Christie { 21019103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 21029103575aSMike Christie struct se_dev_attrib, da_group); 21039103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 21049103575aSMike Christie 21059103575aSMike Christie return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? 21069103575aSMike Christie udev->qfull_time_out : 21079103575aSMike Christie udev->qfull_time_out / MSEC_PER_SEC); 21089103575aSMike Christie } 21099103575aSMike Christie 21109103575aSMike Christie static ssize_t tcmu_qfull_time_out_store(struct config_item *item, 21119103575aSMike Christie const char *page, size_t count) 21129103575aSMike Christie { 21139103575aSMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 21149103575aSMike Christie struct se_dev_attrib, da_group); 21159103575aSMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 21169103575aSMike Christie s32 val; 21179103575aSMike Christie int ret; 21189103575aSMike Christie 21199103575aSMike Christie ret = kstrtos32(page, 0, &val); 21209103575aSMike Christie if (ret < 0) 21219103575aSMike Christie return ret; 21229103575aSMike Christie 21239103575aSMike Christie if (val >= 0) { 21249103575aSMike Christie udev->qfull_time_out = val * MSEC_PER_SEC; 21259103575aSMike Christie } else { 21269103575aSMike Christie printk(KERN_ERR "Invalid qfull timeout value %d\n", val); 21279103575aSMike Christie return -EINVAL; 21289103575aSMike Christie } 21299103575aSMike Christie return count; 21309103575aSMike Christie } 21319103575aSMike Christie CONFIGFS_ATTR(tcmu_, qfull_time_out); 21329103575aSMike Christie 213380eb8761SMike Christie static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) 213480eb8761SMike Christie { 213580eb8761SMike Christie struct se_dev_attrib *da = container_of(to_config_group(item), 213680eb8761SMike Christie struct se_dev_attrib, da_group); 213780eb8761SMike Christie struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 213880eb8761SMike Christie 213980eb8761SMike Christie return snprintf(page, PAGE_SIZE, "%u\n", 214080eb8761SMike Christie TCMU_BLOCKS_TO_MBS(udev->max_blocks)); 214180eb8761SMike Christie } 214280eb8761SMike Christie CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); 214380eb8761SMike Christie 21442d76443eSMike Christie static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) 2145ee018252SBryant G. Ly { 2146ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2147ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2148ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2149ee018252SBryant G. Ly 2150ee018252SBryant G. Ly return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); 2151ee018252SBryant G. Ly } 2152ee018252SBryant G. Ly 21532d76443eSMike Christie static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, 2154ee018252SBryant G. Ly size_t count) 2155ee018252SBryant G. Ly { 2156ee018252SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2157ee018252SBryant G. Ly struct se_dev_attrib, da_group); 2158ee018252SBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 21592d76443eSMike Christie int ret, len; 2160ee018252SBryant G. Ly 21612d76443eSMike Christie len = strlen(page); 21622d76443eSMike Christie if (!len || len > TCMU_CONFIG_LEN - 1) 2163ee018252SBryant G. Ly return -EINVAL; 2164ee018252SBryant G. Ly 2165ee018252SBryant G. Ly /* Check if device has been configured before */ 2166ee018252SBryant G. Ly if (tcmu_dev_configured(udev)) { 2167b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 21682d76443eSMike Christie TCMU_ATTR_DEV_CFG, page); 2169ee018252SBryant G. Ly if (ret) { 2170ee018252SBryant G. Ly pr_err("Unable to reconfigure device\n"); 2171ee018252SBryant G. Ly return ret; 2172ee018252SBryant G. Ly } 2173de8c5221SBryant G. Ly strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2174de8c5221SBryant G. Ly 2175de8c5221SBryant G. Ly ret = tcmu_update_uio_info(udev); 2176de8c5221SBryant G. Ly if (ret) 2177de8c5221SBryant G. Ly return ret; 2178de8c5221SBryant G. Ly return count; 2179ee018252SBryant G. Ly } 21802d76443eSMike Christie strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); 2181ee018252SBryant G. Ly 2182ee018252SBryant G. Ly return count; 2183ee018252SBryant G. Ly } 21842d76443eSMike Christie CONFIGFS_ATTR(tcmu_, dev_config); 2185ee018252SBryant G. Ly 2186801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) 2187801fc54dSBryant G. Ly { 2188801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2189801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2190801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2191801fc54dSBryant G. Ly 2192801fc54dSBryant G. Ly return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); 2193801fc54dSBryant G. Ly } 2194801fc54dSBryant G. Ly 2195801fc54dSBryant G. Ly static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, 2196801fc54dSBryant G. Ly size_t count) 2197801fc54dSBryant G. Ly { 2198801fc54dSBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 2199801fc54dSBryant G. Ly struct se_dev_attrib, da_group); 2200801fc54dSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22012d76443eSMike Christie u64 val; 2202801fc54dSBryant G. Ly int ret; 2203801fc54dSBryant G. Ly 22042d76443eSMike Christie ret = kstrtou64(page, 0, &val); 2205801fc54dSBryant G. Ly if (ret < 0) 2206801fc54dSBryant G. Ly return ret; 2207801fc54dSBryant G. Ly 2208801fc54dSBryant G. Ly /* Check if device has been configured before */ 2209801fc54dSBryant G. Ly if (tcmu_dev_configured(udev)) { 2210b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 22112d76443eSMike Christie TCMU_ATTR_DEV_SIZE, &val); 2212801fc54dSBryant G. Ly if (ret) { 2213801fc54dSBryant G. Ly pr_err("Unable to reconfigure device\n"); 2214801fc54dSBryant G. Ly return ret; 2215801fc54dSBryant G. Ly } 2216801fc54dSBryant G. Ly } 22172d76443eSMike Christie udev->dev_size = val; 2218801fc54dSBryant G. Ly return count; 2219801fc54dSBryant G. Ly } 2220801fc54dSBryant G. Ly CONFIGFS_ATTR(tcmu_, dev_size); 2221801fc54dSBryant G. Ly 2222b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, 2223b849b456SKenjiro Nakayama char *page) 2224b849b456SKenjiro Nakayama { 2225b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2226b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2227b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2228b849b456SKenjiro Nakayama 2229b849b456SKenjiro Nakayama return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); 2230b849b456SKenjiro Nakayama } 2231b849b456SKenjiro Nakayama 2232b849b456SKenjiro Nakayama static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, 2233b849b456SKenjiro Nakayama const char *page, size_t count) 2234b849b456SKenjiro Nakayama { 2235b849b456SKenjiro Nakayama struct se_dev_attrib *da = container_of(to_config_group(item), 2236b849b456SKenjiro Nakayama struct se_dev_attrib, da_group); 2237b849b456SKenjiro Nakayama struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 2238b849b456SKenjiro Nakayama s8 val; 2239b849b456SKenjiro Nakayama int ret; 2240b849b456SKenjiro Nakayama 2241b849b456SKenjiro Nakayama ret = kstrtos8(page, 0, &val); 2242b849b456SKenjiro Nakayama if (ret < 0) 2243b849b456SKenjiro Nakayama return ret; 2244b849b456SKenjiro Nakayama 2245b849b456SKenjiro Nakayama udev->nl_reply_supported = val; 2246b849b456SKenjiro Nakayama return count; 2247b849b456SKenjiro Nakayama } 2248b849b456SKenjiro Nakayama CONFIGFS_ATTR(tcmu_, nl_reply_supported); 2249b849b456SKenjiro Nakayama 22509a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, 22519a8bb606SBryant G. Ly char *page) 22529a8bb606SBryant G. Ly { 22539a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 22549a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 22559a8bb606SBryant G. Ly 22569a8bb606SBryant G. Ly return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); 22579a8bb606SBryant G. Ly } 22589a8bb606SBryant G. Ly 22599a8bb606SBryant G. Ly static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, 22609a8bb606SBryant G. Ly const char *page, size_t count) 22619a8bb606SBryant G. Ly { 22629a8bb606SBryant G. Ly struct se_dev_attrib *da = container_of(to_config_group(item), 22639a8bb606SBryant G. Ly struct se_dev_attrib, da_group); 22641068be7bSBryant G. Ly struct tcmu_dev *udev = TCMU_DEV(da->da_dev); 22652d76443eSMike Christie u8 val; 22669a8bb606SBryant G. Ly int ret; 22679a8bb606SBryant G. Ly 22682d76443eSMike Christie ret = kstrtou8(page, 0, &val); 22699a8bb606SBryant G. Ly if (ret < 0) 22709a8bb606SBryant G. Ly return ret; 22719a8bb606SBryant G. Ly 22721068be7bSBryant G. Ly /* Check if device has been configured before */ 22731068be7bSBryant G. Ly if (tcmu_dev_configured(udev)) { 2274b3af66e2SMike Christie ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, 22752d76443eSMike Christie TCMU_ATTR_WRITECACHE, &val); 22761068be7bSBryant G. Ly if (ret) { 22771068be7bSBryant G. Ly pr_err("Unable to reconfigure device\n"); 22781068be7bSBryant G. Ly return ret; 22791068be7bSBryant G. Ly } 22801068be7bSBryant G. Ly } 22812d76443eSMike Christie 22822d76443eSMike Christie da->emulate_write_cache = val; 22839a8bb606SBryant G. Ly return count; 22849a8bb606SBryant G. Ly } 22859a8bb606SBryant G. Ly CONFIGFS_ATTR(tcmu_, emulate_write_cache); 22869a8bb606SBryant G. Ly 2287892782caSMike Christie static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) 2288892782caSMike Christie { 2289892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2290892782caSMike Christie struct se_device, 2291892782caSMike Christie dev_action_group); 2292892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2293892782caSMike Christie 2294892782caSMike Christie if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) 2295892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); 2296892782caSMike Christie else 2297892782caSMike Christie return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); 2298892782caSMike Christie } 2299892782caSMike Christie 2300892782caSMike Christie static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, 2301892782caSMike Christie size_t count) 2302892782caSMike Christie { 2303892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2304892782caSMike Christie struct se_device, 2305892782caSMike Christie dev_action_group); 2306892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2307892782caSMike Christie u8 val; 2308892782caSMike Christie int ret; 2309892782caSMike Christie 2310892782caSMike Christie ret = kstrtou8(page, 0, &val); 2311892782caSMike Christie if (ret < 0) 2312892782caSMike Christie return ret; 2313892782caSMike Christie 2314892782caSMike Christie if (val > 1) { 2315892782caSMike Christie pr_err("Invalid block value %d\n", val); 2316892782caSMike Christie return -EINVAL; 2317892782caSMike Christie } 2318892782caSMike Christie 2319892782caSMike Christie if (!val) 2320892782caSMike Christie tcmu_unblock_dev(udev); 2321892782caSMike Christie else 2322892782caSMike Christie tcmu_block_dev(udev); 2323892782caSMike Christie return count; 2324892782caSMike Christie } 2325892782caSMike Christie CONFIGFS_ATTR(tcmu_, block_dev); 2326892782caSMike Christie 2327892782caSMike Christie static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, 2328892782caSMike Christie size_t count) 2329892782caSMike Christie { 2330892782caSMike Christie struct se_device *se_dev = container_of(to_config_group(item), 2331892782caSMike Christie struct se_device, 2332892782caSMike Christie dev_action_group); 2333892782caSMike Christie struct tcmu_dev *udev = TCMU_DEV(se_dev); 2334892782caSMike Christie u8 val; 2335892782caSMike Christie int ret; 2336892782caSMike Christie 2337892782caSMike Christie ret = kstrtou8(page, 0, &val); 2338892782caSMike Christie if (ret < 0) 2339892782caSMike Christie return ret; 2340892782caSMike Christie 2341892782caSMike Christie if (val != 1 && val != 2) { 2342892782caSMike Christie pr_err("Invalid reset ring value %d\n", val); 2343892782caSMike Christie return -EINVAL; 2344892782caSMike Christie } 2345892782caSMike Christie 2346892782caSMike Christie tcmu_reset_ring(udev, val); 2347892782caSMike Christie return count; 2348892782caSMike Christie } 2349892782caSMike Christie CONFIGFS_ATTR_WO(tcmu_, reset_ring); 2350892782caSMike Christie 23515821783bSColin Ian King static struct configfs_attribute *tcmu_attrib_attrs[] = { 2352801fc54dSBryant G. Ly &tcmu_attr_cmd_time_out, 23539103575aSMike Christie &tcmu_attr_qfull_time_out, 235480eb8761SMike Christie &tcmu_attr_max_data_area_mb, 23552d76443eSMike Christie &tcmu_attr_dev_config, 2356801fc54dSBryant G. Ly &tcmu_attr_dev_size, 2357801fc54dSBryant G. Ly &tcmu_attr_emulate_write_cache, 2358b849b456SKenjiro Nakayama &tcmu_attr_nl_reply_supported, 2359801fc54dSBryant G. Ly NULL, 2360801fc54dSBryant G. Ly }; 2361801fc54dSBryant G. Ly 23627d7a7435SNicholas Bellinger static struct configfs_attribute **tcmu_attrs; 23637d7a7435SNicholas Bellinger 2364892782caSMike Christie static struct configfs_attribute *tcmu_action_attrs[] = { 2365892782caSMike Christie &tcmu_attr_block_dev, 2366892782caSMike Christie &tcmu_attr_reset_ring, 2367892782caSMike Christie NULL, 2368892782caSMike Christie }; 2369892782caSMike Christie 23707d7a7435SNicholas Bellinger static struct target_backend_ops tcmu_ops = { 23717c9e7a6fSAndy Grover .name = "user", 23727c9e7a6fSAndy Grover .owner = THIS_MODULE, 2373a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 23747c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 23757c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 23767c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 23777c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 237892634706SMike Christie .destroy_device = tcmu_destroy_device, 23797c9e7a6fSAndy Grover .free_device = tcmu_free_device, 23807c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 23817c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 23827c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 23837c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 23847c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 2385892782caSMike Christie .tb_dev_action_attrs = tcmu_action_attrs, 23867c9e7a6fSAndy Grover }; 23877c9e7a6fSAndy Grover 238889ec9cfdSMike Christie static void find_free_blocks(void) 2389b6df4b79SXiubo Li { 2390b6df4b79SXiubo Li struct tcmu_dev *udev; 2391b6df4b79SXiubo Li loff_t off; 2392af1dd7ffSMike Christie u32 start, end, block, total_freed = 0; 2393af1dd7ffSMike Christie 239480eb8761SMike Christie if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) 2395af1dd7ffSMike Christie return; 2396b6df4b79SXiubo Li 2397b6df4b79SXiubo Li mutex_lock(&root_udev_mutex); 2398b6df4b79SXiubo Li list_for_each_entry(udev, &root_udev, node) { 2399b6df4b79SXiubo Li mutex_lock(&udev->cmdr_lock); 2400b6df4b79SXiubo Li 2401b6df4b79SXiubo Li /* Try to complete the finished commands first */ 2402b6df4b79SXiubo Li tcmu_handle_completions(udev); 2403b6df4b79SXiubo Li 2404af1dd7ffSMike Christie /* Skip the udevs in idle */ 2405af1dd7ffSMike Christie if (!udev->dbi_thresh) { 2406b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2407b6df4b79SXiubo Li continue; 2408b6df4b79SXiubo Li } 2409b6df4b79SXiubo Li 2410b6df4b79SXiubo Li end = udev->dbi_max + 1; 2411b6df4b79SXiubo Li block = find_last_bit(udev->data_bitmap, end); 2412b6df4b79SXiubo Li if (block == udev->dbi_max) { 2413b6df4b79SXiubo Li /* 2414af1dd7ffSMike Christie * The last bit is dbi_max, so it is not possible 2415af1dd7ffSMike Christie * reclaim any blocks. 2416b6df4b79SXiubo Li */ 2417b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2418b6df4b79SXiubo Li continue; 2419b6df4b79SXiubo Li } else if (block == end) { 2420b6df4b79SXiubo Li /* The current udev will goto idle state */ 2421b6df4b79SXiubo Li udev->dbi_thresh = start = 0; 2422b6df4b79SXiubo Li udev->dbi_max = 0; 2423b6df4b79SXiubo Li } else { 2424b6df4b79SXiubo Li udev->dbi_thresh = start = block + 1; 2425b6df4b79SXiubo Li udev->dbi_max = block; 2426b6df4b79SXiubo Li } 2427b6df4b79SXiubo Li 2428b6df4b79SXiubo Li /* Here will truncate the data area from off */ 2429b6df4b79SXiubo Li off = udev->data_off + start * DATA_BLOCK_SIZE; 2430b6df4b79SXiubo Li unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); 2431b6df4b79SXiubo Li 2432b6df4b79SXiubo Li /* Release the block pages */ 2433bf99ec13SMike Christie tcmu_blocks_release(&udev->data_blocks, start, end); 2434b6df4b79SXiubo Li mutex_unlock(&udev->cmdr_lock); 2435af1dd7ffSMike Christie 2436af1dd7ffSMike Christie total_freed += end - start; 2437af1dd7ffSMike Christie pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, 2438af1dd7ffSMike Christie total_freed, udev->name); 2439b6df4b79SXiubo Li } 244089ec9cfdSMike Christie mutex_unlock(&root_udev_mutex); 244189ec9cfdSMike Christie 244280eb8761SMike Christie if (atomic_read(&global_db_count) > tcmu_global_max_blocks) 2443af1dd7ffSMike Christie schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); 2444b6df4b79SXiubo Li } 2445b6df4b79SXiubo Li 2446488ebe4cSMike Christie static void check_timedout_devices(void) 2447488ebe4cSMike Christie { 2448488ebe4cSMike Christie struct tcmu_dev *udev, *tmp_dev; 2449488ebe4cSMike Christie LIST_HEAD(devs); 2450488ebe4cSMike Christie 2451488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2452488ebe4cSMike Christie list_splice_init(&timed_out_udevs, &devs); 2453488ebe4cSMike Christie 2454488ebe4cSMike Christie list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { 2455488ebe4cSMike Christie list_del_init(&udev->timedout_entry); 2456488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2457488ebe4cSMike Christie 24586fddcb77SMike Christie mutex_lock(&udev->cmdr_lock); 2459488ebe4cSMike Christie idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 24606fddcb77SMike Christie mutex_unlock(&udev->cmdr_lock); 2461488ebe4cSMike Christie 2462488ebe4cSMike Christie spin_lock_bh(&timed_out_udevs_lock); 2463488ebe4cSMike Christie } 2464488ebe4cSMike Christie 2465488ebe4cSMike Christie spin_unlock_bh(&timed_out_udevs_lock); 2466488ebe4cSMike Christie } 2467488ebe4cSMike Christie 24689972cebbSMike Christie static void tcmu_unmap_work_fn(struct work_struct *work) 246989ec9cfdSMike Christie { 2470488ebe4cSMike Christie check_timedout_devices(); 247189ec9cfdSMike Christie find_free_blocks(); 247289ec9cfdSMike Christie } 247389ec9cfdSMike Christie 24747c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 24757c9e7a6fSAndy Grover { 2476801fc54dSBryant G. Ly int ret, i, k, len = 0; 24777c9e7a6fSAndy Grover 24787c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 24797c9e7a6fSAndy Grover 2480af1dd7ffSMike Christie INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); 24819972cebbSMike Christie 24827c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 24837c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 24847c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 24857c9e7a6fSAndy Grover 0, NULL); 24867c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 24877c9e7a6fSAndy Grover return -ENOMEM; 24887c9e7a6fSAndy Grover 24897c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 24907c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 24917c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 24927c9e7a6fSAndy Grover goto out_free_cache; 24937c9e7a6fSAndy Grover } 24947c9e7a6fSAndy Grover 24957c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 24967c9e7a6fSAndy Grover if (ret < 0) { 24977c9e7a6fSAndy Grover goto out_unreg_device; 24987c9e7a6fSAndy Grover } 24997c9e7a6fSAndy Grover 25007d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 25017d7a7435SNicholas Bellinger len += sizeof(struct configfs_attribute *); 25027d7a7435SNicholas Bellinger } 2503801fc54dSBryant G. Ly for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { 2504801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 2505801fc54dSBryant G. Ly } 2506801fc54dSBryant G. Ly len += sizeof(struct configfs_attribute *); 25077d7a7435SNicholas Bellinger 25087d7a7435SNicholas Bellinger tcmu_attrs = kzalloc(len, GFP_KERNEL); 25097d7a7435SNicholas Bellinger if (!tcmu_attrs) { 25107d7a7435SNicholas Bellinger ret = -ENOMEM; 25117d7a7435SNicholas Bellinger goto out_unreg_genl; 25127d7a7435SNicholas Bellinger } 25137d7a7435SNicholas Bellinger 25147d7a7435SNicholas Bellinger for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { 25157d7a7435SNicholas Bellinger tcmu_attrs[i] = passthrough_attrib_attrs[i]; 25167d7a7435SNicholas Bellinger } 2517801fc54dSBryant G. Ly for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { 2518801fc54dSBryant G. Ly tcmu_attrs[i] = tcmu_attrib_attrs[k]; 25199a8bb606SBryant G. Ly i++; 2520801fc54dSBryant G. Ly } 25217d7a7435SNicholas Bellinger tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; 25227d7a7435SNicholas Bellinger 25230a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 25247c9e7a6fSAndy Grover if (ret) 25257d7a7435SNicholas Bellinger goto out_attrs; 25267c9e7a6fSAndy Grover 25277c9e7a6fSAndy Grover return 0; 25287c9e7a6fSAndy Grover 25297d7a7435SNicholas Bellinger out_attrs: 25307d7a7435SNicholas Bellinger kfree(tcmu_attrs); 25317c9e7a6fSAndy Grover out_unreg_genl: 25327c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 25337c9e7a6fSAndy Grover out_unreg_device: 25347c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 25357c9e7a6fSAndy Grover out_free_cache: 25367c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 25377c9e7a6fSAndy Grover 25387c9e7a6fSAndy Grover return ret; 25397c9e7a6fSAndy Grover } 25407c9e7a6fSAndy Grover 25417c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 25427c9e7a6fSAndy Grover { 2543af1dd7ffSMike Christie cancel_delayed_work_sync(&tcmu_unmap_work); 25440a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 25457d7a7435SNicholas Bellinger kfree(tcmu_attrs); 25467c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 25477c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 25487c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 25497c9e7a6fSAndy Grover } 25507c9e7a6fSAndy Grover 25517c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 25527c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 25537c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 25547c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 25557c9e7a6fSAndy Grover 25567c9e7a6fSAndy Grover module_init(tcmu_module_init); 25577c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 2558