17c9e7a6fSAndy Grover /* 27c9e7a6fSAndy Grover * Copyright (C) 2013 Shaohua Li <shli@kernel.org> 37c9e7a6fSAndy Grover * Copyright (C) 2014 Red Hat, Inc. 47c9e7a6fSAndy Grover * 57c9e7a6fSAndy Grover * This program is free software; you can redistribute it and/or modify it 67c9e7a6fSAndy Grover * under the terms and conditions of the GNU General Public License, 77c9e7a6fSAndy Grover * version 2, as published by the Free Software Foundation. 87c9e7a6fSAndy Grover * 97c9e7a6fSAndy Grover * This program is distributed in the hope it will be useful, but WITHOUT 107c9e7a6fSAndy Grover * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 117c9e7a6fSAndy Grover * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 127c9e7a6fSAndy Grover * more details. 137c9e7a6fSAndy Grover * 147c9e7a6fSAndy Grover * You should have received a copy of the GNU General Public License along with 157c9e7a6fSAndy Grover * this program; if not, write to the Free Software Foundation, Inc., 167c9e7a6fSAndy Grover * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 177c9e7a6fSAndy Grover */ 187c9e7a6fSAndy Grover 197c9e7a6fSAndy Grover #include <linux/spinlock.h> 207c9e7a6fSAndy Grover #include <linux/module.h> 217c9e7a6fSAndy Grover #include <linux/idr.h> 22ba929992SBart Van Assche #include <linux/kernel.h> 237c9e7a6fSAndy Grover #include <linux/timer.h> 247c9e7a6fSAndy Grover #include <linux/parser.h> 257c9e7a6fSAndy Grover #include <linux/uio_driver.h> 267c9e7a6fSAndy Grover #include <net/genetlink.h> 27ba929992SBart Van Assche #include <scsi/scsi_common.h> 28ba929992SBart Van Assche #include <scsi/scsi_proto.h> 297c9e7a6fSAndy Grover #include <target/target_core_base.h> 307c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 317c9e7a6fSAndy Grover #include <target/target_core_backend.h> 32e9f720d6SNicholas Bellinger #include <target/target_core_backend_configfs.h> 33e9f720d6SNicholas Bellinger 347c9e7a6fSAndy Grover #include <linux/target_core_user.h> 357c9e7a6fSAndy Grover 367c9e7a6fSAndy Grover /* 377c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 387c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 397c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 407c9e7a6fSAndy Grover * 417c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 427c9e7a6fSAndy Grover * introspection work for us. 437c9e7a6fSAndy Grover * 447c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 457c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 467c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 477c9e7a6fSAndy Grover * internal to the mmap()ed area. There is separate space outside the 487c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 497c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 507c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 517c9e7a6fSAndy Grover * 527c9e7a6fSAndy Grover * SECURITY: 537c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 547c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 557c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 567c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 577c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 587c9e7a6fSAndy Grover * this may have a 'UAM' comment. 597c9e7a6fSAndy Grover */ 607c9e7a6fSAndy Grover 617c9e7a6fSAndy Grover 627c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 637c9e7a6fSAndy Grover 647c9e7a6fSAndy Grover #define CMDR_SIZE (16 * 4096) 657c9e7a6fSAndy Grover #define DATA_SIZE (257 * 4096) 667c9e7a6fSAndy Grover 677c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 687c9e7a6fSAndy Grover 697c9e7a6fSAndy Grover static struct device *tcmu_root_device; 707c9e7a6fSAndy Grover 717c9e7a6fSAndy Grover struct tcmu_hba { 727c9e7a6fSAndy Grover u32 host_id; 737c9e7a6fSAndy Grover }; 747c9e7a6fSAndy Grover 757c9e7a6fSAndy Grover /* User wants all cmds or just some */ 767c9e7a6fSAndy Grover enum passthru_level { 777c9e7a6fSAndy Grover TCMU_PASS_ALL = 0, 787c9e7a6fSAndy Grover TCMU_PASS_IO, 797c9e7a6fSAndy Grover TCMU_PASS_INVALID, 807c9e7a6fSAndy Grover }; 817c9e7a6fSAndy Grover 827c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 837c9e7a6fSAndy Grover 847c9e7a6fSAndy Grover struct tcmu_dev { 857c9e7a6fSAndy Grover struct se_device se_dev; 867c9e7a6fSAndy Grover 877c9e7a6fSAndy Grover char *name; 887c9e7a6fSAndy Grover struct se_hba *hba; 897c9e7a6fSAndy Grover 907c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 917c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 927c9e7a6fSAndy Grover unsigned long flags; 937c9e7a6fSAndy Grover enum passthru_level pass_level; 947c9e7a6fSAndy Grover 957c9e7a6fSAndy Grover struct uio_info uio_info; 967c9e7a6fSAndy Grover 977c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 987c9e7a6fSAndy Grover size_t dev_size; 997c9e7a6fSAndy Grover u32 cmdr_size; 1007c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 1017c9e7a6fSAndy Grover /* Offset of data ring from start of mb */ 1027c9e7a6fSAndy Grover size_t data_off; 1037c9e7a6fSAndy Grover size_t data_size; 1047c9e7a6fSAndy Grover /* Ring head + tail values. */ 1057c9e7a6fSAndy Grover /* Must add data_off and mb_addr to get the address */ 1067c9e7a6fSAndy Grover size_t data_head; 1077c9e7a6fSAndy Grover size_t data_tail; 1087c9e7a6fSAndy Grover 1097c9e7a6fSAndy Grover wait_queue_head_t wait_cmdr; 1107c9e7a6fSAndy Grover /* TODO should this be a mutex? */ 1117c9e7a6fSAndy Grover spinlock_t cmdr_lock; 1127c9e7a6fSAndy Grover 1137c9e7a6fSAndy Grover struct idr commands; 1147c9e7a6fSAndy Grover spinlock_t commands_lock; 1157c9e7a6fSAndy Grover 1167c9e7a6fSAndy Grover struct timer_list timeout; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 1197c9e7a6fSAndy Grover }; 1207c9e7a6fSAndy Grover 1217c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1227c9e7a6fSAndy Grover 1237c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1247c9e7a6fSAndy Grover 1257c9e7a6fSAndy Grover struct tcmu_cmd { 1267c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1277c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 1287c9e7a6fSAndy Grover 1297c9e7a6fSAndy Grover uint16_t cmd_id; 1307c9e7a6fSAndy Grover 1317c9e7a6fSAndy Grover /* Can't use se_cmd->data_length when cleaning up expired cmds, because if 1327c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 1337c9e7a6fSAndy Grover size_t data_length; 1347c9e7a6fSAndy Grover 1357c9e7a6fSAndy Grover unsigned long deadline; 1367c9e7a6fSAndy Grover 1377c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1387c9e7a6fSAndy Grover unsigned long flags; 1397c9e7a6fSAndy Grover }; 1407c9e7a6fSAndy Grover 1417c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 1427c9e7a6fSAndy Grover 1437c9e7a6fSAndy Grover /* multicast group */ 1447c9e7a6fSAndy Grover enum tcmu_multicast_groups { 1457c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 1467c9e7a6fSAndy Grover }; 1477c9e7a6fSAndy Grover 1487c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 1497c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 1507c9e7a6fSAndy Grover }; 1517c9e7a6fSAndy Grover 1527c9e7a6fSAndy Grover /* Our generic netlink family */ 1537c9e7a6fSAndy Grover static struct genl_family tcmu_genl_family = { 1547c9e7a6fSAndy Grover .id = GENL_ID_GENERATE, 1557c9e7a6fSAndy Grover .hdrsize = 0, 1567c9e7a6fSAndy Grover .name = "TCM-USER", 1577c9e7a6fSAndy Grover .version = 1, 1587c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 1597c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 1607c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 1617c9e7a6fSAndy Grover }; 1627c9e7a6fSAndy Grover 1637c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 1647c9e7a6fSAndy Grover { 1657c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 1667c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 1677c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1687c9e7a6fSAndy Grover int cmd_id; 1697c9e7a6fSAndy Grover 1707c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 1717c9e7a6fSAndy Grover if (!tcmu_cmd) 1727c9e7a6fSAndy Grover return NULL; 1737c9e7a6fSAndy Grover 1747c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 1757c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 1767c9e7a6fSAndy Grover tcmu_cmd->data_length = se_cmd->data_length; 1777c9e7a6fSAndy Grover 1787c9e7a6fSAndy Grover tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); 1797c9e7a6fSAndy Grover 1807c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 1817c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1827c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 1837c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 1847c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1857c9e7a6fSAndy Grover idr_preload_end(); 1867c9e7a6fSAndy Grover 1877c9e7a6fSAndy Grover if (cmd_id < 0) { 1887c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 1897c9e7a6fSAndy Grover return NULL; 1907c9e7a6fSAndy Grover } 1917c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 1927c9e7a6fSAndy Grover 1937c9e7a6fSAndy Grover return tcmu_cmd; 1947c9e7a6fSAndy Grover } 1957c9e7a6fSAndy Grover 1967c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 1977c9e7a6fSAndy Grover { 1987c9e7a6fSAndy Grover unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; 1997c9e7a6fSAndy Grover 2007c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 2017c9e7a6fSAndy Grover vaddr -= offset; 2027c9e7a6fSAndy Grover 2037c9e7a6fSAndy Grover while (size) { 2047c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 2057c9e7a6fSAndy Grover size -= PAGE_SIZE; 2067c9e7a6fSAndy Grover } 2077c9e7a6fSAndy Grover } 2087c9e7a6fSAndy Grover 2097c9e7a6fSAndy Grover /* 2107c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 2117c9e7a6fSAndy Grover * we can't use circ_buf.h. 2127c9e7a6fSAndy Grover */ 2137c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 2147c9e7a6fSAndy Grover { 2157c9e7a6fSAndy Grover int diff = head - tail; 2167c9e7a6fSAndy Grover 2177c9e7a6fSAndy Grover if (diff >= 0) 2187c9e7a6fSAndy Grover return diff; 2197c9e7a6fSAndy Grover else 2207c9e7a6fSAndy Grover return size + diff; 2217c9e7a6fSAndy Grover } 2227c9e7a6fSAndy Grover 2237c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 2247c9e7a6fSAndy Grover { 2257c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 2267c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 2277c9e7a6fSAndy Grover } 2287c9e7a6fSAndy Grover 2297c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 2307c9e7a6fSAndy Grover { 2317c9e7a6fSAndy Grover return size - head; 2327c9e7a6fSAndy Grover } 2337c9e7a6fSAndy Grover 2347c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 2357c9e7a6fSAndy Grover 2367c9e7a6fSAndy Grover /* 2377c9e7a6fSAndy Grover * We can't queue a command until we have space available on the cmd ring *and* space 2387c9e7a6fSAndy Grover * space avail on the data ring. 2397c9e7a6fSAndy Grover * 2407c9e7a6fSAndy Grover * Called with ring lock held. 2417c9e7a6fSAndy Grover */ 242f56574a2SAndy Grover static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) 2437c9e7a6fSAndy Grover { 2447c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 2457c9e7a6fSAndy Grover size_t space; 2467c9e7a6fSAndy Grover u32 cmd_head; 247f56574a2SAndy Grover size_t cmd_needed; 2487c9e7a6fSAndy Grover 2497c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 2507c9e7a6fSAndy Grover 2517c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 2527c9e7a6fSAndy Grover 253f56574a2SAndy Grover /* 254f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 255f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 256f56574a2SAndy Grover */ 257f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 258f56574a2SAndy Grover cmd_needed = cmd_size; 259f56574a2SAndy Grover else 260f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 261f56574a2SAndy Grover 2627c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 2637c9e7a6fSAndy Grover if (space < cmd_needed) { 2647c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 2657c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 2667c9e7a6fSAndy Grover return false; 2677c9e7a6fSAndy Grover } 2687c9e7a6fSAndy Grover 2697c9e7a6fSAndy Grover space = spc_free(udev->data_head, udev->data_tail, udev->data_size); 2707c9e7a6fSAndy Grover if (space < data_needed) { 2717c9e7a6fSAndy Grover pr_debug("no data space: %zu %zu %zu\n", udev->data_head, 2727c9e7a6fSAndy Grover udev->data_tail, udev->data_size); 2737c9e7a6fSAndy Grover return false; 2747c9e7a6fSAndy Grover } 2757c9e7a6fSAndy Grover 2767c9e7a6fSAndy Grover return true; 2777c9e7a6fSAndy Grover } 2787c9e7a6fSAndy Grover 2797c9e7a6fSAndy Grover static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 2807c9e7a6fSAndy Grover { 2817c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 2827c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 2837c9e7a6fSAndy Grover size_t base_command_size, command_size; 2847c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 2857c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 2867c9e7a6fSAndy Grover int i; 2877c9e7a6fSAndy Grover struct scatterlist *sg; 2887c9e7a6fSAndy Grover struct iovec *iov; 2897c9e7a6fSAndy Grover int iov_cnt = 0; 2907c9e7a6fSAndy Grover uint32_t cmd_head; 2917c9e7a6fSAndy Grover uint64_t cdb_off; 2927c9e7a6fSAndy Grover 2937c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 2947c9e7a6fSAndy Grover return -EINVAL; 2957c9e7a6fSAndy Grover 2967c9e7a6fSAndy Grover /* 2977c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 2987c9e7a6fSAndy Grover * also may be larger if the iov array is large. 2997c9e7a6fSAndy Grover * 3007c9e7a6fSAndy Grover * iovs = sgl_nents+1, for end-of-ring case, plus another 1 3017c9e7a6fSAndy Grover * b/c size == offsetof one-past-element. 3027c9e7a6fSAndy Grover */ 3037c9e7a6fSAndy Grover base_command_size = max(offsetof(struct tcmu_cmd_entry, 3047c9e7a6fSAndy Grover req.iov[se_cmd->t_data_nents + 2]), 3057c9e7a6fSAndy Grover sizeof(struct tcmu_cmd_entry)); 3067c9e7a6fSAndy Grover command_size = base_command_size 3077c9e7a6fSAndy Grover + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); 3087c9e7a6fSAndy Grover 3097c9e7a6fSAndy Grover WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 3107c9e7a6fSAndy Grover 3117c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 3127c9e7a6fSAndy Grover 3137c9e7a6fSAndy Grover mb = udev->mb_addr; 3147c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3157c9e7a6fSAndy Grover if ((command_size > (udev->cmdr_size / 2)) 3167c9e7a6fSAndy Grover || tcmu_cmd->data_length > (udev->data_size - 1)) 3177c9e7a6fSAndy Grover pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " 3187c9e7a6fSAndy Grover "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, 3197c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 3207c9e7a6fSAndy Grover 321f56574a2SAndy Grover while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { 3227c9e7a6fSAndy Grover int ret; 3237c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 3247c9e7a6fSAndy Grover 3257c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 3267c9e7a6fSAndy Grover 3277c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 3287c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 3297c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 3307c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 3317c9e7a6fSAndy Grover if (!ret) { 3327c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 3337c9e7a6fSAndy Grover return -ETIMEDOUT; 3347c9e7a6fSAndy Grover } 3357c9e7a6fSAndy Grover 3367c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 3377c9e7a6fSAndy Grover 3387c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 3397c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3407c9e7a6fSAndy Grover } 3417c9e7a6fSAndy Grover 342f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 343f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 344f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 345f56574a2SAndy Grover 3467c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 3477c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 3480ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 3490ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 3500ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 3510ad46af8SAndy Grover entry->hdr.kflags = 0; 3520ad46af8SAndy Grover entry->hdr.uflags = 0; 3537c9e7a6fSAndy Grover 3547c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 3557c9e7a6fSAndy Grover 3567c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3577c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 3587c9e7a6fSAndy Grover } 3597c9e7a6fSAndy Grover 3607c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 3617c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 3620ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 3630ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 3640ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 3650ad46af8SAndy Grover entry->hdr.kflags = 0; 3660ad46af8SAndy Grover entry->hdr.uflags = 0; 3677c9e7a6fSAndy Grover 3687c9e7a6fSAndy Grover /* 3697c9e7a6fSAndy Grover * Fix up iovecs, and handle if allocation in data ring wrapped. 3707c9e7a6fSAndy Grover */ 3717c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 3727c9e7a6fSAndy Grover for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { 3737c9e7a6fSAndy Grover size_t copy_bytes = min((size_t)sg->length, 3747c9e7a6fSAndy Grover head_to_end(udev->data_head, udev->data_size)); 3757c9e7a6fSAndy Grover void *from = kmap_atomic(sg_page(sg)) + sg->offset; 3767c9e7a6fSAndy Grover void *to = (void *) mb + udev->data_off + udev->data_head; 3777c9e7a6fSAndy Grover 3787c9e7a6fSAndy Grover if (tcmu_cmd->se_cmd->data_direction == DMA_TO_DEVICE) { 3797c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 3807c9e7a6fSAndy Grover tcmu_flush_dcache_range(to, copy_bytes); 3817c9e7a6fSAndy Grover } 3827c9e7a6fSAndy Grover 3837c9e7a6fSAndy Grover /* Even iov_base is relative to mb_addr */ 3847c9e7a6fSAndy Grover iov->iov_len = copy_bytes; 385b3c95172SChristoph Hellwig iov->iov_base = (void __user *) udev->data_off + 386b3c95172SChristoph Hellwig udev->data_head; 3877c9e7a6fSAndy Grover iov_cnt++; 3887c9e7a6fSAndy Grover iov++; 3897c9e7a6fSAndy Grover 3907c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 3917c9e7a6fSAndy Grover 3927c9e7a6fSAndy Grover /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ 3937c9e7a6fSAndy Grover if (sg->length != copy_bytes) { 3947c9e7a6fSAndy Grover from += copy_bytes; 3957c9e7a6fSAndy Grover copy_bytes = sg->length - copy_bytes; 3967c9e7a6fSAndy Grover 3977c9e7a6fSAndy Grover iov->iov_len = copy_bytes; 398b3c95172SChristoph Hellwig iov->iov_base = (void __user *) udev->data_off + 399b3c95172SChristoph Hellwig udev->data_head; 4007c9e7a6fSAndy Grover 4017c9e7a6fSAndy Grover if (se_cmd->data_direction == DMA_TO_DEVICE) { 4027c9e7a6fSAndy Grover to = (void *) mb + udev->data_off + udev->data_head; 4037c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 4047c9e7a6fSAndy Grover tcmu_flush_dcache_range(to, copy_bytes); 4057c9e7a6fSAndy Grover } 4067c9e7a6fSAndy Grover 4077c9e7a6fSAndy Grover iov_cnt++; 4087c9e7a6fSAndy Grover iov++; 4097c9e7a6fSAndy Grover 4107c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 4117c9e7a6fSAndy Grover } 4127c9e7a6fSAndy Grover 4137c9e7a6fSAndy Grover kunmap_atomic(from); 4147c9e7a6fSAndy Grover } 4157c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 4160ad46af8SAndy Grover entry->req.iov_bidi_cnt = 0; 4170ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 4187c9e7a6fSAndy Grover 4197c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 4207c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 4217c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 4227c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 4237c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4247c9e7a6fSAndy Grover 4257c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 4267c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 4277c9e7a6fSAndy Grover 4287c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4297c9e7a6fSAndy Grover 4307c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 4317c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 4327c9e7a6fSAndy Grover 4337c9e7a6fSAndy Grover mod_timer(&udev->timeout, 4347c9e7a6fSAndy Grover round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); 4357c9e7a6fSAndy Grover 4367c9e7a6fSAndy Grover return 0; 4377c9e7a6fSAndy Grover } 4387c9e7a6fSAndy Grover 4397c9e7a6fSAndy Grover static int tcmu_queue_cmd(struct se_cmd *se_cmd) 4407c9e7a6fSAndy Grover { 4417c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 4427c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 4437c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 4447c9e7a6fSAndy Grover int ret; 4457c9e7a6fSAndy Grover 4467c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 4477c9e7a6fSAndy Grover if (!tcmu_cmd) 4487c9e7a6fSAndy Grover return -ENOMEM; 4497c9e7a6fSAndy Grover 4507c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 4517c9e7a6fSAndy Grover if (ret < 0) { 4527c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 4537c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 4547c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 4557c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 4567c9e7a6fSAndy Grover 4577c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 4587c9e7a6fSAndy Grover } 4597c9e7a6fSAndy Grover 4607c9e7a6fSAndy Grover return ret; 4617c9e7a6fSAndy Grover } 4627c9e7a6fSAndy Grover 4637c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 4647c9e7a6fSAndy Grover { 4657c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 4667c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 4677c9e7a6fSAndy Grover 4687c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 4697c9e7a6fSAndy Grover /* cmd has been completed already from timeout, just reclaim data 4707c9e7a6fSAndy Grover ring space */ 4717c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4727c9e7a6fSAndy Grover return; 4737c9e7a6fSAndy Grover } 4747c9e7a6fSAndy Grover 4750ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 4760ad46af8SAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4770ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 4780ad46af8SAndy Grover cmd->se_cmd); 4790ad46af8SAndy Grover transport_generic_request_failure(cmd->se_cmd, 4800ad46af8SAndy Grover TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); 4810ad46af8SAndy Grover cmd->se_cmd = NULL; 4820ad46af8SAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 4830ad46af8SAndy Grover return; 4840ad46af8SAndy Grover } 4850ad46af8SAndy Grover 4867c9e7a6fSAndy Grover if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 4877c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 4887c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 4897c9e7a6fSAndy Grover 4907c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4917c9e7a6fSAndy Grover } 4927c9e7a6fSAndy Grover else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 4937c9e7a6fSAndy Grover struct scatterlist *sg; 4947c9e7a6fSAndy Grover int i; 4957c9e7a6fSAndy Grover 4967c9e7a6fSAndy Grover /* It'd be easier to look at entry's iovec again, but UAM */ 4977c9e7a6fSAndy Grover for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { 4987c9e7a6fSAndy Grover size_t copy_bytes; 4997c9e7a6fSAndy Grover void *to; 5007c9e7a6fSAndy Grover void *from; 5017c9e7a6fSAndy Grover 5027c9e7a6fSAndy Grover copy_bytes = min((size_t)sg->length, 5037c9e7a6fSAndy Grover head_to_end(udev->data_tail, udev->data_size)); 5047c9e7a6fSAndy Grover 5057c9e7a6fSAndy Grover to = kmap_atomic(sg_page(sg)) + sg->offset; 5067c9e7a6fSAndy Grover WARN_ON(sg->length + sg->offset > PAGE_SIZE); 5077c9e7a6fSAndy Grover from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; 5087c9e7a6fSAndy Grover tcmu_flush_dcache_range(from, copy_bytes); 5097c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 5107c9e7a6fSAndy Grover 5117c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 5127c9e7a6fSAndy Grover 5137c9e7a6fSAndy Grover /* Uh oh, wrapped the data buffer for this sg's data */ 5147c9e7a6fSAndy Grover if (sg->length != copy_bytes) { 5157c9e7a6fSAndy Grover from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; 5167c9e7a6fSAndy Grover WARN_ON(udev->data_tail); 5177c9e7a6fSAndy Grover to += copy_bytes; 5187c9e7a6fSAndy Grover copy_bytes = sg->length - copy_bytes; 5197c9e7a6fSAndy Grover tcmu_flush_dcache_range(from, copy_bytes); 5207c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 5217c9e7a6fSAndy Grover 5227c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 5237c9e7a6fSAndy Grover } 5247c9e7a6fSAndy Grover 5257c9e7a6fSAndy Grover kunmap_atomic(to); 5267c9e7a6fSAndy Grover } 5277c9e7a6fSAndy Grover 5287c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 5297c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5307c9e7a6fSAndy Grover } else { 5317c9e7a6fSAndy Grover pr_warn("TCMU: data direction was %d!\n", se_cmd->data_direction); 5327c9e7a6fSAndy Grover } 5337c9e7a6fSAndy Grover 5347c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 5357c9e7a6fSAndy Grover cmd->se_cmd = NULL; 5367c9e7a6fSAndy Grover 5377c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 5387c9e7a6fSAndy Grover } 5397c9e7a6fSAndy Grover 5407c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 5417c9e7a6fSAndy Grover { 5427c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 5437c9e7a6fSAndy Grover LIST_HEAD(cpl_cmds); 5447c9e7a6fSAndy Grover unsigned long flags; 5457c9e7a6fSAndy Grover int handled = 0; 5467c9e7a6fSAndy Grover 5477c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 5487c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 5497c9e7a6fSAndy Grover return 0; 5507c9e7a6fSAndy Grover } 5517c9e7a6fSAndy Grover 5527c9e7a6fSAndy Grover spin_lock_irqsave(&udev->cmdr_lock, flags); 5537c9e7a6fSAndy Grover 5547c9e7a6fSAndy Grover mb = udev->mb_addr; 5557c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5567c9e7a6fSAndy Grover 5577c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 5587c9e7a6fSAndy Grover 5597c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 5607c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 5617c9e7a6fSAndy Grover 5627c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 5637c9e7a6fSAndy Grover 5640ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 5650ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 5660ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 5670ad46af8SAndy Grover udev->cmdr_size); 5687c9e7a6fSAndy Grover continue; 5697c9e7a6fSAndy Grover } 5700ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 5717c9e7a6fSAndy Grover 5727c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 5730ad46af8SAndy Grover cmd = idr_find(&udev->commands, entry->hdr.cmd_id); 5747c9e7a6fSAndy Grover if (cmd) 5757c9e7a6fSAndy Grover idr_remove(&udev->commands, cmd->cmd_id); 5767c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 5777c9e7a6fSAndy Grover 5787c9e7a6fSAndy Grover if (!cmd) { 5797c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 5807c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 5817c9e7a6fSAndy Grover break; 5827c9e7a6fSAndy Grover } 5837c9e7a6fSAndy Grover 5847c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 5857c9e7a6fSAndy Grover 5860ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 5870ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 5880ad46af8SAndy Grover udev->cmdr_size); 5897c9e7a6fSAndy Grover 5907c9e7a6fSAndy Grover handled++; 5917c9e7a6fSAndy Grover } 5927c9e7a6fSAndy Grover 5937c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 5947c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 5957c9e7a6fSAndy Grover 5967c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->cmdr_lock, flags); 5977c9e7a6fSAndy Grover 5987c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 5997c9e7a6fSAndy Grover 6007c9e7a6fSAndy Grover return handled; 6017c9e7a6fSAndy Grover } 6027c9e7a6fSAndy Grover 6037c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 6047c9e7a6fSAndy Grover { 6057c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 6067c9e7a6fSAndy Grover 6077c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 6087c9e7a6fSAndy Grover return 0; 6097c9e7a6fSAndy Grover 6107c9e7a6fSAndy Grover if (!time_after(cmd->deadline, jiffies)) 6117c9e7a6fSAndy Grover return 0; 6127c9e7a6fSAndy Grover 6137c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 6147c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 6157c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6167c9e7a6fSAndy Grover 6177c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6187c9e7a6fSAndy Grover 6197c9e7a6fSAndy Grover return 0; 6207c9e7a6fSAndy Grover } 6217c9e7a6fSAndy Grover 6227c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 6237c9e7a6fSAndy Grover { 6247c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 6257c9e7a6fSAndy Grover unsigned long flags; 6267c9e7a6fSAndy Grover int handled; 6277c9e7a6fSAndy Grover 6287c9e7a6fSAndy Grover handled = tcmu_handle_completions(udev); 6297c9e7a6fSAndy Grover 6307c9e7a6fSAndy Grover pr_warn("%d completions handled from timeout\n", handled); 6317c9e7a6fSAndy Grover 6327c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 6337c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 6347c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 6357c9e7a6fSAndy Grover 6367c9e7a6fSAndy Grover /* 6377c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 6387c9e7a6fSAndy Grover * own timeout. 6397c9e7a6fSAndy Grover */ 6407c9e7a6fSAndy Grover } 6417c9e7a6fSAndy Grover 6427c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 6437c9e7a6fSAndy Grover { 6447c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 6457c9e7a6fSAndy Grover 6467c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 6477c9e7a6fSAndy Grover if (!tcmu_hba) 6487c9e7a6fSAndy Grover return -ENOMEM; 6497c9e7a6fSAndy Grover 6507c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 6517c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 6527c9e7a6fSAndy Grover 6537c9e7a6fSAndy Grover return 0; 6547c9e7a6fSAndy Grover } 6557c9e7a6fSAndy Grover 6567c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 6577c9e7a6fSAndy Grover { 6587c9e7a6fSAndy Grover kfree(hba->hba_ptr); 6597c9e7a6fSAndy Grover hba->hba_ptr = NULL; 6607c9e7a6fSAndy Grover } 6617c9e7a6fSAndy Grover 6627c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 6637c9e7a6fSAndy Grover { 6647c9e7a6fSAndy Grover struct tcmu_dev *udev; 6657c9e7a6fSAndy Grover 6667c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 6677c9e7a6fSAndy Grover if (!udev) 6687c9e7a6fSAndy Grover return NULL; 6697c9e7a6fSAndy Grover 6707c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 6717c9e7a6fSAndy Grover if (!udev->name) { 6727c9e7a6fSAndy Grover kfree(udev); 6737c9e7a6fSAndy Grover return NULL; 6747c9e7a6fSAndy Grover } 6757c9e7a6fSAndy Grover 6767c9e7a6fSAndy Grover udev->hba = hba; 6777c9e7a6fSAndy Grover 6787c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 6797c9e7a6fSAndy Grover spin_lock_init(&udev->cmdr_lock); 6807c9e7a6fSAndy Grover 6817c9e7a6fSAndy Grover idr_init(&udev->commands); 6827c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 6837c9e7a6fSAndy Grover 6847c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 6857c9e7a6fSAndy Grover (unsigned long)udev); 6867c9e7a6fSAndy Grover 6877c9e7a6fSAndy Grover udev->pass_level = TCMU_PASS_ALL; 6887c9e7a6fSAndy Grover 6897c9e7a6fSAndy Grover return &udev->se_dev; 6907c9e7a6fSAndy Grover } 6917c9e7a6fSAndy Grover 6927c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 6937c9e7a6fSAndy Grover { 6947c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 6957c9e7a6fSAndy Grover 6967c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 6977c9e7a6fSAndy Grover 6987c9e7a6fSAndy Grover return 0; 6997c9e7a6fSAndy Grover } 7007c9e7a6fSAndy Grover 7017c9e7a6fSAndy Grover /* 7027c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 7037c9e7a6fSAndy Grover * and this stuff must come along. 7047c9e7a6fSAndy Grover */ 7057c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 7067c9e7a6fSAndy Grover { 7077c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7087c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7097c9e7a6fSAndy Grover 7107c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 7117c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 7127c9e7a6fSAndy Grover return -1; 7137c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 7147c9e7a6fSAndy Grover } 7157c9e7a6fSAndy Grover return -1; 7167c9e7a6fSAndy Grover } 7177c9e7a6fSAndy Grover 7187c9e7a6fSAndy Grover static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7197c9e7a6fSAndy Grover { 7207c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7217c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7227c9e7a6fSAndy Grover struct page *page; 7237c9e7a6fSAndy Grover unsigned long offset; 7247c9e7a6fSAndy Grover void *addr; 7257c9e7a6fSAndy Grover 7267c9e7a6fSAndy Grover int mi = tcmu_find_mem_index(vma); 7277c9e7a6fSAndy Grover if (mi < 0) 7287c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 7297c9e7a6fSAndy Grover 7307c9e7a6fSAndy Grover /* 7317c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 7327c9e7a6fSAndy Grover * to use mem[N]. 7337c9e7a6fSAndy Grover */ 7347c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 7357c9e7a6fSAndy Grover 7367c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 7377c9e7a6fSAndy Grover if (info->mem[mi].memtype == UIO_MEM_LOGICAL) 7387c9e7a6fSAndy Grover page = virt_to_page(addr); 7397c9e7a6fSAndy Grover else 7407c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 7417c9e7a6fSAndy Grover get_page(page); 7427c9e7a6fSAndy Grover vmf->page = page; 7437c9e7a6fSAndy Grover return 0; 7447c9e7a6fSAndy Grover } 7457c9e7a6fSAndy Grover 7467c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 7477c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 7487c9e7a6fSAndy Grover }; 7497c9e7a6fSAndy Grover 7507c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 7517c9e7a6fSAndy Grover { 7527c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7537c9e7a6fSAndy Grover 7547c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7557c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 7567c9e7a6fSAndy Grover 7577c9e7a6fSAndy Grover vma->vm_private_data = udev; 7587c9e7a6fSAndy Grover 7597c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 7607c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 7617c9e7a6fSAndy Grover return -EINVAL; 7627c9e7a6fSAndy Grover 7637c9e7a6fSAndy Grover return 0; 7647c9e7a6fSAndy Grover } 7657c9e7a6fSAndy Grover 7667c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 7677c9e7a6fSAndy Grover { 7687c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7697c9e7a6fSAndy Grover 7707c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 7717c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 7727c9e7a6fSAndy Grover return -EBUSY; 7737c9e7a6fSAndy Grover 7747c9e7a6fSAndy Grover pr_debug("open\n"); 7757c9e7a6fSAndy Grover 7767c9e7a6fSAndy Grover return 0; 7777c9e7a6fSAndy Grover } 7787c9e7a6fSAndy Grover 7797c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 7807c9e7a6fSAndy Grover { 7817c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7827c9e7a6fSAndy Grover 7837c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 7847c9e7a6fSAndy Grover 7857c9e7a6fSAndy Grover pr_debug("close\n"); 7867c9e7a6fSAndy Grover 7877c9e7a6fSAndy Grover return 0; 7887c9e7a6fSAndy Grover } 7897c9e7a6fSAndy Grover 7907c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 7917c9e7a6fSAndy Grover { 7927c9e7a6fSAndy Grover struct sk_buff *skb; 7937c9e7a6fSAndy Grover void *msg_header; 7946e14eab9SNicholas Bellinger int ret = -ENOMEM; 7957c9e7a6fSAndy Grover 7967c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 7977c9e7a6fSAndy Grover if (!skb) 7986e14eab9SNicholas Bellinger return ret; 7997c9e7a6fSAndy Grover 8007c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 8016e14eab9SNicholas Bellinger if (!msg_header) 8026e14eab9SNicholas Bellinger goto free_skb; 8037c9e7a6fSAndy Grover 8047c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 8056e14eab9SNicholas Bellinger if (ret < 0) 8066e14eab9SNicholas Bellinger goto free_skb; 8077c9e7a6fSAndy Grover 8087c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 8096e14eab9SNicholas Bellinger if (ret < 0) 8106e14eab9SNicholas Bellinger goto free_skb; 8117c9e7a6fSAndy Grover 812053c095aSJohannes Berg genlmsg_end(skb, msg_header); 8137c9e7a6fSAndy Grover 8147c9e7a6fSAndy Grover ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, 8157c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 8167c9e7a6fSAndy Grover 8177c9e7a6fSAndy Grover /* We don't care if no one is listening */ 8187c9e7a6fSAndy Grover if (ret == -ESRCH) 8197c9e7a6fSAndy Grover ret = 0; 8207c9e7a6fSAndy Grover 8217c9e7a6fSAndy Grover return ret; 8226e14eab9SNicholas Bellinger free_skb: 8236e14eab9SNicholas Bellinger nlmsg_free(skb); 8246e14eab9SNicholas Bellinger return ret; 8257c9e7a6fSAndy Grover } 8267c9e7a6fSAndy Grover 8277c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 8287c9e7a6fSAndy Grover { 8297c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 8307c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 8317c9e7a6fSAndy Grover struct uio_info *info; 8327c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8337c9e7a6fSAndy Grover size_t size; 8347c9e7a6fSAndy Grover size_t used; 8357c9e7a6fSAndy Grover int ret = 0; 8367c9e7a6fSAndy Grover char *str; 8377c9e7a6fSAndy Grover 8387c9e7a6fSAndy Grover info = &udev->uio_info; 8397c9e7a6fSAndy Grover 8407c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 8417c9e7a6fSAndy Grover udev->dev_config); 8427c9e7a6fSAndy Grover size += 1; /* for \0 */ 8437c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 8447c9e7a6fSAndy Grover if (!str) 8457c9e7a6fSAndy Grover return -ENOMEM; 8467c9e7a6fSAndy Grover 8477c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 8487c9e7a6fSAndy Grover 8497c9e7a6fSAndy Grover if (udev->dev_config[0]) 8507c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 8517c9e7a6fSAndy Grover 8527c9e7a6fSAndy Grover info->name = str; 8537c9e7a6fSAndy Grover 8547c9e7a6fSAndy Grover udev->mb_addr = vzalloc(TCMU_RING_SIZE); 8557c9e7a6fSAndy Grover if (!udev->mb_addr) { 8567c9e7a6fSAndy Grover ret = -ENOMEM; 8577c9e7a6fSAndy Grover goto err_vzalloc; 8587c9e7a6fSAndy Grover } 8597c9e7a6fSAndy Grover 8607c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 8617c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 8627c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 8637c9e7a6fSAndy Grover udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; 8647c9e7a6fSAndy Grover 8657c9e7a6fSAndy Grover mb = udev->mb_addr; 8660ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 8677c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 8687c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 8697c9e7a6fSAndy Grover 8707c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 8717c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 8727c9e7a6fSAndy Grover 8730ad46af8SAndy Grover info->version = xstr(TCMU_MAILBOX_VERSION); 8747c9e7a6fSAndy Grover 8757c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 8767c9e7a6fSAndy Grover info->mem[0].addr = (phys_addr_t) udev->mb_addr; 8777c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 8787c9e7a6fSAndy Grover info->mem[0].memtype = UIO_MEM_VIRTUAL; 8797c9e7a6fSAndy Grover 8807c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 8817c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 8827c9e7a6fSAndy Grover 8837c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 8847c9e7a6fSAndy Grover info->open = tcmu_open; 8857c9e7a6fSAndy Grover info->release = tcmu_release; 8867c9e7a6fSAndy Grover 8877c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 8887c9e7a6fSAndy Grover if (ret) 8897c9e7a6fSAndy Grover goto err_register; 8907c9e7a6fSAndy Grover 8917c9e7a6fSAndy Grover /* Other attributes can be configured in userspace */ 8927c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 8937c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 8947c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 8957c9e7a6fSAndy Grover 8967c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 8977c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 8987c9e7a6fSAndy Grover if (ret) 8997c9e7a6fSAndy Grover goto err_netlink; 9007c9e7a6fSAndy Grover 9017c9e7a6fSAndy Grover return 0; 9027c9e7a6fSAndy Grover 9037c9e7a6fSAndy Grover err_netlink: 9047c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9057c9e7a6fSAndy Grover err_register: 9067c9e7a6fSAndy Grover vfree(udev->mb_addr); 9077c9e7a6fSAndy Grover err_vzalloc: 9087c9e7a6fSAndy Grover kfree(info->name); 9097c9e7a6fSAndy Grover 9107c9e7a6fSAndy Grover return ret; 9117c9e7a6fSAndy Grover } 9127c9e7a6fSAndy Grover 9137c9e7a6fSAndy Grover static int tcmu_check_pending_cmd(int id, void *p, void *data) 9147c9e7a6fSAndy Grover { 9157c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 9167c9e7a6fSAndy Grover 9177c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 9187c9e7a6fSAndy Grover return 0; 9197c9e7a6fSAndy Grover return -EINVAL; 9207c9e7a6fSAndy Grover } 9217c9e7a6fSAndy Grover 9227c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 9237c9e7a6fSAndy Grover { 9247c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9257c9e7a6fSAndy Grover int i; 9267c9e7a6fSAndy Grover 9277c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 9287c9e7a6fSAndy Grover 9297c9e7a6fSAndy Grover vfree(udev->mb_addr); 9307c9e7a6fSAndy Grover 9317c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 9327c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 9337c9e7a6fSAndy Grover i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); 9347c9e7a6fSAndy Grover idr_destroy(&udev->commands); 9357c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 9367c9e7a6fSAndy Grover WARN_ON(i); 9377c9e7a6fSAndy Grover 9387c9e7a6fSAndy Grover /* Device was configured */ 9397c9e7a6fSAndy Grover if (udev->uio_info.uio_dev) { 9407c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 9417c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9427c9e7a6fSAndy Grover 9437c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9447c9e7a6fSAndy Grover kfree(udev->uio_info.name); 9457c9e7a6fSAndy Grover kfree(udev->name); 9467c9e7a6fSAndy Grover } 9477c9e7a6fSAndy Grover 9487c9e7a6fSAndy Grover kfree(udev); 9497c9e7a6fSAndy Grover } 9507c9e7a6fSAndy Grover 9517c9e7a6fSAndy Grover enum { 9527c9e7a6fSAndy Grover Opt_dev_config, Opt_dev_size, Opt_err, Opt_pass_level, 9537c9e7a6fSAndy Grover }; 9547c9e7a6fSAndy Grover 9557c9e7a6fSAndy Grover static match_table_t tokens = { 9567c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 9577c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 9587c9e7a6fSAndy Grover {Opt_pass_level, "pass_level=%u"}, 9597c9e7a6fSAndy Grover {Opt_err, NULL} 9607c9e7a6fSAndy Grover }; 9617c9e7a6fSAndy Grover 9627c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 9637c9e7a6fSAndy Grover const char *page, ssize_t count) 9647c9e7a6fSAndy Grover { 9657c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9667c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 9677c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 9687c9e7a6fSAndy Grover int ret = 0, token; 9697c9e7a6fSAndy Grover int arg; 9707c9e7a6fSAndy Grover 9717c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 9727c9e7a6fSAndy Grover if (!opts) 9737c9e7a6fSAndy Grover return -ENOMEM; 9747c9e7a6fSAndy Grover 9757c9e7a6fSAndy Grover orig = opts; 9767c9e7a6fSAndy Grover 9777c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 9787c9e7a6fSAndy Grover if (!*ptr) 9797c9e7a6fSAndy Grover continue; 9807c9e7a6fSAndy Grover 9817c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 9827c9e7a6fSAndy Grover switch (token) { 9837c9e7a6fSAndy Grover case Opt_dev_config: 9847c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 9857c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 9867c9e7a6fSAndy Grover ret = -EINVAL; 9877c9e7a6fSAndy Grover break; 9887c9e7a6fSAndy Grover } 9897c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 9907c9e7a6fSAndy Grover break; 9917c9e7a6fSAndy Grover case Opt_dev_size: 9927c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 9937c9e7a6fSAndy Grover if (!arg_p) { 9947c9e7a6fSAndy Grover ret = -ENOMEM; 9957c9e7a6fSAndy Grover break; 9967c9e7a6fSAndy Grover } 9977c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 9987c9e7a6fSAndy Grover kfree(arg_p); 9997c9e7a6fSAndy Grover if (ret < 0) 10007c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 10017c9e7a6fSAndy Grover break; 10027c9e7a6fSAndy Grover case Opt_pass_level: 10037c9e7a6fSAndy Grover match_int(args, &arg); 10047c9e7a6fSAndy Grover if (arg >= TCMU_PASS_INVALID) { 10057c9e7a6fSAndy Grover pr_warn("TCMU: Invalid pass_level: %d\n", arg); 10067c9e7a6fSAndy Grover break; 10077c9e7a6fSAndy Grover } 10087c9e7a6fSAndy Grover 10097c9e7a6fSAndy Grover pr_debug("TCMU: Setting pass_level to %d\n", arg); 10107c9e7a6fSAndy Grover udev->pass_level = arg; 10117c9e7a6fSAndy Grover break; 10127c9e7a6fSAndy Grover default: 10137c9e7a6fSAndy Grover break; 10147c9e7a6fSAndy Grover } 10157c9e7a6fSAndy Grover } 10167c9e7a6fSAndy Grover 10177c9e7a6fSAndy Grover kfree(orig); 10187c9e7a6fSAndy Grover return (!ret) ? count : ret; 10197c9e7a6fSAndy Grover } 10207c9e7a6fSAndy Grover 10217c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 10227c9e7a6fSAndy Grover { 10237c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10247c9e7a6fSAndy Grover ssize_t bl = 0; 10257c9e7a6fSAndy Grover 10267c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 10277c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 10287c9e7a6fSAndy Grover bl += sprintf(b + bl, "Size: %zu PassLevel: %u\n", 10297c9e7a6fSAndy Grover udev->dev_size, udev->pass_level); 10307c9e7a6fSAndy Grover 10317c9e7a6fSAndy Grover return bl; 10327c9e7a6fSAndy Grover } 10337c9e7a6fSAndy Grover 10347c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 10357c9e7a6fSAndy Grover { 10367c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10377c9e7a6fSAndy Grover 10387c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 10397c9e7a6fSAndy Grover dev->dev_attrib.block_size); 10407c9e7a6fSAndy Grover } 10417c9e7a6fSAndy Grover 10427c9e7a6fSAndy Grover static sense_reason_t 10437c9e7a6fSAndy Grover tcmu_execute_rw(struct se_cmd *se_cmd, struct scatterlist *sgl, u32 sgl_nents, 10447c9e7a6fSAndy Grover enum dma_data_direction data_direction) 10457c9e7a6fSAndy Grover { 10467c9e7a6fSAndy Grover int ret; 10477c9e7a6fSAndy Grover 10487c9e7a6fSAndy Grover ret = tcmu_queue_cmd(se_cmd); 10497c9e7a6fSAndy Grover 10507c9e7a6fSAndy Grover if (ret != 0) 10517c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10527c9e7a6fSAndy Grover else 10537c9e7a6fSAndy Grover return TCM_NO_SENSE; 10547c9e7a6fSAndy Grover } 10557c9e7a6fSAndy Grover 10567c9e7a6fSAndy Grover static sense_reason_t 10577c9e7a6fSAndy Grover tcmu_pass_op(struct se_cmd *se_cmd) 10587c9e7a6fSAndy Grover { 10597c9e7a6fSAndy Grover int ret = tcmu_queue_cmd(se_cmd); 10607c9e7a6fSAndy Grover 10617c9e7a6fSAndy Grover if (ret != 0) 10627c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10637c9e7a6fSAndy Grover else 10647c9e7a6fSAndy Grover return TCM_NO_SENSE; 10657c9e7a6fSAndy Grover } 10667c9e7a6fSAndy Grover 10677c9e7a6fSAndy Grover static struct sbc_ops tcmu_sbc_ops = { 10687c9e7a6fSAndy Grover .execute_rw = tcmu_execute_rw, 10697c9e7a6fSAndy Grover .execute_sync_cache = tcmu_pass_op, 10707c9e7a6fSAndy Grover .execute_write_same = tcmu_pass_op, 10717c9e7a6fSAndy Grover .execute_write_same_unmap = tcmu_pass_op, 10727c9e7a6fSAndy Grover .execute_unmap = tcmu_pass_op, 10737c9e7a6fSAndy Grover }; 10747c9e7a6fSAndy Grover 10757c9e7a6fSAndy Grover static sense_reason_t 10767c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 10777c9e7a6fSAndy Grover { 10787c9e7a6fSAndy Grover unsigned char *cdb = cmd->t_task_cdb; 10797c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(cmd->se_dev); 10807c9e7a6fSAndy Grover sense_reason_t ret; 10817c9e7a6fSAndy Grover 10827c9e7a6fSAndy Grover switch (udev->pass_level) { 10837c9e7a6fSAndy Grover case TCMU_PASS_ALL: 10847c9e7a6fSAndy Grover /* We're just like pscsi, then */ 10857c9e7a6fSAndy Grover /* 10867c9e7a6fSAndy Grover * For REPORT LUNS we always need to emulate the response, for everything 10877c9e7a6fSAndy Grover * else, pass it up. 10887c9e7a6fSAndy Grover */ 10897c9e7a6fSAndy Grover switch (cdb[0]) { 10907c9e7a6fSAndy Grover case REPORT_LUNS: 10917c9e7a6fSAndy Grover cmd->execute_cmd = spc_emulate_report_luns; 10927c9e7a6fSAndy Grover break; 10937c9e7a6fSAndy Grover case READ_6: 10947c9e7a6fSAndy Grover case READ_10: 10957c9e7a6fSAndy Grover case READ_12: 10967c9e7a6fSAndy Grover case READ_16: 10977c9e7a6fSAndy Grover case WRITE_6: 10987c9e7a6fSAndy Grover case WRITE_10: 10997c9e7a6fSAndy Grover case WRITE_12: 11007c9e7a6fSAndy Grover case WRITE_16: 11017c9e7a6fSAndy Grover case WRITE_VERIFY: 11027c9e7a6fSAndy Grover cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 11037c9e7a6fSAndy Grover /* FALLTHROUGH */ 11047c9e7a6fSAndy Grover default: 11057c9e7a6fSAndy Grover cmd->execute_cmd = tcmu_pass_op; 11067c9e7a6fSAndy Grover } 11077c9e7a6fSAndy Grover ret = TCM_NO_SENSE; 11087c9e7a6fSAndy Grover break; 11097c9e7a6fSAndy Grover case TCMU_PASS_IO: 11107c9e7a6fSAndy Grover ret = sbc_parse_cdb(cmd, &tcmu_sbc_ops); 11117c9e7a6fSAndy Grover break; 11127c9e7a6fSAndy Grover default: 11137c9e7a6fSAndy Grover pr_err("Unknown tcm-user pass level %d\n", udev->pass_level); 11147c9e7a6fSAndy Grover ret = TCM_CHECK_CONDITION_ABORT_CMD; 11157c9e7a6fSAndy Grover } 11167c9e7a6fSAndy Grover 11177c9e7a6fSAndy Grover return ret; 11187c9e7a6fSAndy Grover } 11197c9e7a6fSAndy Grover 1120e9f720d6SNicholas Bellinger DEF_TB_DEFAULT_ATTRIBS(tcmu); 1121e9f720d6SNicholas Bellinger 1122e9f720d6SNicholas Bellinger static struct configfs_attribute *tcmu_backend_dev_attrs[] = { 1123e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_model_alias.attr, 1124e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_dpo.attr, 1125e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_fua_write.attr, 1126e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_fua_read.attr, 1127e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_write_cache.attr, 1128e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_ua_intlck_ctrl.attr, 1129e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_tas.attr, 1130e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_tpu.attr, 1131e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_tpws.attr, 1132e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_caw.attr, 1133e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_3pc.attr, 1134e9f720d6SNicholas Bellinger &tcmu_dev_attrib_pi_prot_type.attr, 1135e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_pi_prot_type.attr, 1136e9f720d6SNicholas Bellinger &tcmu_dev_attrib_pi_prot_format.attr, 1137e9f720d6SNicholas Bellinger &tcmu_dev_attrib_enforce_pr_isids.attr, 1138e9f720d6SNicholas Bellinger &tcmu_dev_attrib_is_nonrot.attr, 1139e9f720d6SNicholas Bellinger &tcmu_dev_attrib_emulate_rest_reord.attr, 1140e9f720d6SNicholas Bellinger &tcmu_dev_attrib_force_pr_aptpl.attr, 1141e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_block_size.attr, 1142e9f720d6SNicholas Bellinger &tcmu_dev_attrib_block_size.attr, 1143e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_max_sectors.attr, 1144e9f720d6SNicholas Bellinger &tcmu_dev_attrib_optimal_sectors.attr, 1145e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_queue_depth.attr, 1146e9f720d6SNicholas Bellinger &tcmu_dev_attrib_queue_depth.attr, 1147e9f720d6SNicholas Bellinger &tcmu_dev_attrib_max_unmap_lba_count.attr, 1148e9f720d6SNicholas Bellinger &tcmu_dev_attrib_max_unmap_block_desc_count.attr, 1149e9f720d6SNicholas Bellinger &tcmu_dev_attrib_unmap_granularity.attr, 1150e9f720d6SNicholas Bellinger &tcmu_dev_attrib_unmap_granularity_alignment.attr, 1151e9f720d6SNicholas Bellinger &tcmu_dev_attrib_max_write_same_len.attr, 1152e9f720d6SNicholas Bellinger NULL, 1153e9f720d6SNicholas Bellinger }; 1154e9f720d6SNicholas Bellinger 11557c9e7a6fSAndy Grover static struct se_subsystem_api tcmu_template = { 11567c9e7a6fSAndy Grover .name = "user", 11577c9e7a6fSAndy Grover .inquiry_prod = "USER", 11587c9e7a6fSAndy Grover .inquiry_rev = TCMU_VERSION, 11597c9e7a6fSAndy Grover .owner = THIS_MODULE, 11607c9e7a6fSAndy Grover .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 11617c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 11627c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 11637c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 11647c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 11657c9e7a6fSAndy Grover .free_device = tcmu_free_device, 11667c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 11677c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 11687c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 11697c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 11707c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 11717c9e7a6fSAndy Grover }; 11727c9e7a6fSAndy Grover 11737c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 11747c9e7a6fSAndy Grover { 1175e9f720d6SNicholas Bellinger struct target_backend_cits *tbc = &tcmu_template.tb_cits; 11767c9e7a6fSAndy Grover int ret; 11777c9e7a6fSAndy Grover 11787c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 11797c9e7a6fSAndy Grover 11807c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 11817c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 11827c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 11837c9e7a6fSAndy Grover 0, NULL); 11847c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 11857c9e7a6fSAndy Grover return -ENOMEM; 11867c9e7a6fSAndy Grover 11877c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 11887c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 11897c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 11907c9e7a6fSAndy Grover goto out_free_cache; 11917c9e7a6fSAndy Grover } 11927c9e7a6fSAndy Grover 11937c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 11947c9e7a6fSAndy Grover if (ret < 0) { 11957c9e7a6fSAndy Grover goto out_unreg_device; 11967c9e7a6fSAndy Grover } 11977c9e7a6fSAndy Grover 1198e9f720d6SNicholas Bellinger target_core_setup_sub_cits(&tcmu_template); 1199e9f720d6SNicholas Bellinger tbc->tb_dev_attrib_cit.ct_attrs = tcmu_backend_dev_attrs; 1200e9f720d6SNicholas Bellinger 12017c9e7a6fSAndy Grover ret = transport_subsystem_register(&tcmu_template); 12027c9e7a6fSAndy Grover if (ret) 12037c9e7a6fSAndy Grover goto out_unreg_genl; 12047c9e7a6fSAndy Grover 12057c9e7a6fSAndy Grover return 0; 12067c9e7a6fSAndy Grover 12077c9e7a6fSAndy Grover out_unreg_genl: 12087c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 12097c9e7a6fSAndy Grover out_unreg_device: 12107c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 12117c9e7a6fSAndy Grover out_free_cache: 12127c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 12137c9e7a6fSAndy Grover 12147c9e7a6fSAndy Grover return ret; 12157c9e7a6fSAndy Grover } 12167c9e7a6fSAndy Grover 12177c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 12187c9e7a6fSAndy Grover { 12197c9e7a6fSAndy Grover transport_subsystem_release(&tcmu_template); 12207c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 12217c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 12227c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 12237c9e7a6fSAndy Grover } 12247c9e7a6fSAndy Grover 12257c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 12267c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 12277c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 12287c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 12297c9e7a6fSAndy Grover 12307c9e7a6fSAndy Grover module_init(tcmu_module_init); 12317c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1232