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> 227c9e7a6fSAndy Grover #include <linux/timer.h> 237c9e7a6fSAndy Grover #include <linux/parser.h> 247c9e7a6fSAndy Grover #include <scsi/scsi.h> 257c9e7a6fSAndy Grover #include <scsi/scsi_host.h> 267c9e7a6fSAndy Grover #include <linux/uio_driver.h> 277c9e7a6fSAndy Grover #include <net/genetlink.h> 287c9e7a6fSAndy Grover #include <target/target_core_base.h> 297c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 307c9e7a6fSAndy Grover #include <target/target_core_backend.h> 31e9f720d6SNicholas Bellinger #include <target/target_core_backend_configfs.h> 32e9f720d6SNicholas Bellinger 337c9e7a6fSAndy Grover #include <linux/target_core_user.h> 347c9e7a6fSAndy Grover 357c9e7a6fSAndy Grover /* 367c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 377c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 387c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 397c9e7a6fSAndy Grover * 407c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 417c9e7a6fSAndy Grover * introspection work for us. 427c9e7a6fSAndy Grover * 437c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 447c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 457c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 467c9e7a6fSAndy Grover * internal to the mmap()ed area. There is separate space outside the 477c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 487c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 497c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 507c9e7a6fSAndy Grover * 517c9e7a6fSAndy Grover * SECURITY: 527c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 537c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 547c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 557c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 567c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 577c9e7a6fSAndy Grover * this may have a 'UAM' comment. 587c9e7a6fSAndy Grover */ 597c9e7a6fSAndy Grover 607c9e7a6fSAndy Grover 617c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 627c9e7a6fSAndy Grover 637c9e7a6fSAndy Grover #define CMDR_SIZE (16 * 4096) 647c9e7a6fSAndy Grover #define DATA_SIZE (257 * 4096) 657c9e7a6fSAndy Grover 667c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 677c9e7a6fSAndy Grover 687c9e7a6fSAndy Grover static struct device *tcmu_root_device; 697c9e7a6fSAndy Grover 707c9e7a6fSAndy Grover struct tcmu_hba { 717c9e7a6fSAndy Grover u32 host_id; 727c9e7a6fSAndy Grover }; 737c9e7a6fSAndy Grover 747c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 757c9e7a6fSAndy Grover 767c9e7a6fSAndy Grover struct tcmu_dev { 777c9e7a6fSAndy Grover struct se_device se_dev; 787c9e7a6fSAndy Grover 797c9e7a6fSAndy Grover char *name; 807c9e7a6fSAndy Grover struct se_hba *hba; 817c9e7a6fSAndy Grover 827c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 837c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 847c9e7a6fSAndy Grover unsigned long flags; 857c9e7a6fSAndy Grover 867c9e7a6fSAndy Grover struct uio_info uio_info; 877c9e7a6fSAndy Grover 887c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 897c9e7a6fSAndy Grover size_t dev_size; 907c9e7a6fSAndy Grover u32 cmdr_size; 917c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 927c9e7a6fSAndy Grover /* Offset of data ring from start of mb */ 937c9e7a6fSAndy Grover size_t data_off; 947c9e7a6fSAndy Grover size_t data_size; 957c9e7a6fSAndy Grover /* Ring head + tail values. */ 967c9e7a6fSAndy Grover /* Must add data_off and mb_addr to get the address */ 977c9e7a6fSAndy Grover size_t data_head; 987c9e7a6fSAndy Grover size_t data_tail; 997c9e7a6fSAndy Grover 1007c9e7a6fSAndy Grover wait_queue_head_t wait_cmdr; 1017c9e7a6fSAndy Grover /* TODO should this be a mutex? */ 1027c9e7a6fSAndy Grover spinlock_t cmdr_lock; 1037c9e7a6fSAndy Grover 1047c9e7a6fSAndy Grover struct idr commands; 1057c9e7a6fSAndy Grover spinlock_t commands_lock; 1067c9e7a6fSAndy Grover 1077c9e7a6fSAndy Grover struct timer_list timeout; 1087c9e7a6fSAndy Grover 1097c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 1107c9e7a6fSAndy Grover }; 1117c9e7a6fSAndy Grover 1127c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1137c9e7a6fSAndy Grover 1147c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1157c9e7a6fSAndy Grover 1167c9e7a6fSAndy Grover struct tcmu_cmd { 1177c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1187c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 1197c9e7a6fSAndy Grover 1207c9e7a6fSAndy Grover uint16_t cmd_id; 1217c9e7a6fSAndy Grover 1227c9e7a6fSAndy Grover /* Can't use se_cmd->data_length when cleaning up expired cmds, because if 1237c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 1247c9e7a6fSAndy Grover size_t data_length; 1257c9e7a6fSAndy Grover 1267c9e7a6fSAndy Grover unsigned long deadline; 1277c9e7a6fSAndy Grover 1287c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1297c9e7a6fSAndy Grover unsigned long flags; 1307c9e7a6fSAndy Grover }; 1317c9e7a6fSAndy Grover 1327c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 1337c9e7a6fSAndy Grover 1347c9e7a6fSAndy Grover /* multicast group */ 1357c9e7a6fSAndy Grover enum tcmu_multicast_groups { 1367c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 1377c9e7a6fSAndy Grover }; 1387c9e7a6fSAndy Grover 1397c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 1407c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 1417c9e7a6fSAndy Grover }; 1427c9e7a6fSAndy Grover 1437c9e7a6fSAndy Grover /* Our generic netlink family */ 1447c9e7a6fSAndy Grover static struct genl_family tcmu_genl_family = { 1457c9e7a6fSAndy Grover .id = GENL_ID_GENERATE, 1467c9e7a6fSAndy Grover .hdrsize = 0, 1477c9e7a6fSAndy Grover .name = "TCM-USER", 1487c9e7a6fSAndy Grover .version = 1, 1497c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 1507c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 1517c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 1527c9e7a6fSAndy Grover }; 1537c9e7a6fSAndy Grover 1547c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 1557c9e7a6fSAndy Grover { 1567c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 1577c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 1587c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1597c9e7a6fSAndy Grover int cmd_id; 1607c9e7a6fSAndy Grover 1617c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 1627c9e7a6fSAndy Grover if (!tcmu_cmd) 1637c9e7a6fSAndy Grover return NULL; 1647c9e7a6fSAndy Grover 1657c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 1667c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 1677c9e7a6fSAndy Grover tcmu_cmd->data_length = se_cmd->data_length; 1687c9e7a6fSAndy Grover 1697c9e7a6fSAndy Grover tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); 1707c9e7a6fSAndy Grover 1717c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 1727c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1737c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 1747c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 1757c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1767c9e7a6fSAndy Grover idr_preload_end(); 1777c9e7a6fSAndy Grover 1787c9e7a6fSAndy Grover if (cmd_id < 0) { 1797c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 1807c9e7a6fSAndy Grover return NULL; 1817c9e7a6fSAndy Grover } 1827c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 1837c9e7a6fSAndy Grover 1847c9e7a6fSAndy Grover return tcmu_cmd; 1857c9e7a6fSAndy Grover } 1867c9e7a6fSAndy Grover 1877c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 1887c9e7a6fSAndy Grover { 1897c9e7a6fSAndy Grover unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; 1907c9e7a6fSAndy Grover 1917c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 1927c9e7a6fSAndy Grover vaddr -= offset; 1937c9e7a6fSAndy Grover 1947c9e7a6fSAndy Grover while (size) { 1957c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 1967c9e7a6fSAndy Grover size -= PAGE_SIZE; 1977c9e7a6fSAndy Grover } 1987c9e7a6fSAndy Grover } 1997c9e7a6fSAndy Grover 2007c9e7a6fSAndy Grover /* 2017c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 2027c9e7a6fSAndy Grover * we can't use circ_buf.h. 2037c9e7a6fSAndy Grover */ 2047c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 2057c9e7a6fSAndy Grover { 2067c9e7a6fSAndy Grover int diff = head - tail; 2077c9e7a6fSAndy Grover 2087c9e7a6fSAndy Grover if (diff >= 0) 2097c9e7a6fSAndy Grover return diff; 2107c9e7a6fSAndy Grover else 2117c9e7a6fSAndy Grover return size + diff; 2127c9e7a6fSAndy Grover } 2137c9e7a6fSAndy Grover 2147c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 2157c9e7a6fSAndy Grover { 2167c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 2177c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 2187c9e7a6fSAndy Grover } 2197c9e7a6fSAndy Grover 2207c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 2217c9e7a6fSAndy Grover { 2227c9e7a6fSAndy Grover return size - head; 2237c9e7a6fSAndy Grover } 2247c9e7a6fSAndy Grover 2257c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 2267c9e7a6fSAndy Grover 2277c9e7a6fSAndy Grover /* 2287c9e7a6fSAndy Grover * We can't queue a command until we have space available on the cmd ring *and* space 2297c9e7a6fSAndy Grover * space avail on the data ring. 2307c9e7a6fSAndy Grover * 2317c9e7a6fSAndy Grover * Called with ring lock held. 2327c9e7a6fSAndy Grover */ 233f56574a2SAndy Grover static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) 2347c9e7a6fSAndy Grover { 2357c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 2367c9e7a6fSAndy Grover size_t space; 2377c9e7a6fSAndy Grover u32 cmd_head; 238f56574a2SAndy Grover size_t cmd_needed; 2397c9e7a6fSAndy Grover 2407c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 2417c9e7a6fSAndy Grover 2427c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 2437c9e7a6fSAndy Grover 244f56574a2SAndy Grover /* 245f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 246f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 247f56574a2SAndy Grover */ 248f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 249f56574a2SAndy Grover cmd_needed = cmd_size; 250f56574a2SAndy Grover else 251f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 252f56574a2SAndy Grover 2537c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 2547c9e7a6fSAndy Grover if (space < cmd_needed) { 2557c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 2567c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 2577c9e7a6fSAndy Grover return false; 2587c9e7a6fSAndy Grover } 2597c9e7a6fSAndy Grover 2607c9e7a6fSAndy Grover space = spc_free(udev->data_head, udev->data_tail, udev->data_size); 2617c9e7a6fSAndy Grover if (space < data_needed) { 2627c9e7a6fSAndy Grover pr_debug("no data space: %zu %zu %zu\n", udev->data_head, 2637c9e7a6fSAndy Grover udev->data_tail, udev->data_size); 2647c9e7a6fSAndy Grover return false; 2657c9e7a6fSAndy Grover } 2667c9e7a6fSAndy Grover 2677c9e7a6fSAndy Grover return true; 2687c9e7a6fSAndy Grover } 2697c9e7a6fSAndy Grover 2707c9e7a6fSAndy Grover static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 2717c9e7a6fSAndy Grover { 2727c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 2737c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 2747c9e7a6fSAndy Grover size_t base_command_size, command_size; 2757c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 2767c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 2777c9e7a6fSAndy Grover int i; 2787c9e7a6fSAndy Grover struct scatterlist *sg; 2797c9e7a6fSAndy Grover struct iovec *iov; 2807c9e7a6fSAndy Grover int iov_cnt = 0; 2817c9e7a6fSAndy Grover uint32_t cmd_head; 2827c9e7a6fSAndy Grover uint64_t cdb_off; 2837c9e7a6fSAndy Grover 2847c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 2857c9e7a6fSAndy Grover return -EINVAL; 2867c9e7a6fSAndy Grover 2877c9e7a6fSAndy Grover /* 2887c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 2897c9e7a6fSAndy Grover * also may be larger if the iov array is large. 2907c9e7a6fSAndy Grover * 2917c9e7a6fSAndy Grover * iovs = sgl_nents+1, for end-of-ring case, plus another 1 2927c9e7a6fSAndy Grover * b/c size == offsetof one-past-element. 2937c9e7a6fSAndy Grover */ 2947c9e7a6fSAndy Grover base_command_size = max(offsetof(struct tcmu_cmd_entry, 2957c9e7a6fSAndy Grover req.iov[se_cmd->t_data_nents + 2]), 2967c9e7a6fSAndy Grover sizeof(struct tcmu_cmd_entry)); 2977c9e7a6fSAndy Grover command_size = base_command_size 2987c9e7a6fSAndy Grover + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); 2997c9e7a6fSAndy Grover 3007c9e7a6fSAndy Grover WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 3017c9e7a6fSAndy Grover 3027c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 3037c9e7a6fSAndy Grover 3047c9e7a6fSAndy Grover mb = udev->mb_addr; 3057c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3067c9e7a6fSAndy Grover if ((command_size > (udev->cmdr_size / 2)) 3077c9e7a6fSAndy Grover || tcmu_cmd->data_length > (udev->data_size - 1)) 3087c9e7a6fSAndy Grover pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " 3097c9e7a6fSAndy Grover "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, 3107c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 3117c9e7a6fSAndy Grover 312f56574a2SAndy Grover while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { 3137c9e7a6fSAndy Grover int ret; 3147c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 3157c9e7a6fSAndy Grover 3167c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 3177c9e7a6fSAndy Grover 3187c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 3197c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 3207c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 3217c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 3227c9e7a6fSAndy Grover if (!ret) { 3237c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 3247c9e7a6fSAndy Grover return -ETIMEDOUT; 3257c9e7a6fSAndy Grover } 3267c9e7a6fSAndy Grover 3277c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 3287c9e7a6fSAndy Grover 3297c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 3307c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3317c9e7a6fSAndy Grover } 3327c9e7a6fSAndy Grover 333f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 334f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 335f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 336f56574a2SAndy Grover 3377c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 3387c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 3390ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 3400ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 3410ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 3420ad46af8SAndy Grover entry->hdr.kflags = 0; 3430ad46af8SAndy Grover entry->hdr.uflags = 0; 3447c9e7a6fSAndy Grover 3457c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 3467c9e7a6fSAndy Grover 3477c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3487c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 3497c9e7a6fSAndy Grover } 3507c9e7a6fSAndy Grover 3517c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 3527c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 3530ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 3540ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 3550ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 3560ad46af8SAndy Grover entry->hdr.kflags = 0; 3570ad46af8SAndy Grover entry->hdr.uflags = 0; 3587c9e7a6fSAndy Grover 3597c9e7a6fSAndy Grover /* 3607c9e7a6fSAndy Grover * Fix up iovecs, and handle if allocation in data ring wrapped. 3617c9e7a6fSAndy Grover */ 3627c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 3637c9e7a6fSAndy Grover for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { 3647c9e7a6fSAndy Grover size_t copy_bytes = min((size_t)sg->length, 3657c9e7a6fSAndy Grover head_to_end(udev->data_head, udev->data_size)); 3667c9e7a6fSAndy Grover void *from = kmap_atomic(sg_page(sg)) + sg->offset; 3677c9e7a6fSAndy Grover void *to = (void *) mb + udev->data_off + udev->data_head; 3687c9e7a6fSAndy Grover 3697c9e7a6fSAndy Grover if (tcmu_cmd->se_cmd->data_direction == DMA_TO_DEVICE) { 3707c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 3717c9e7a6fSAndy Grover tcmu_flush_dcache_range(to, copy_bytes); 3727c9e7a6fSAndy Grover } 3737c9e7a6fSAndy Grover 3747c9e7a6fSAndy Grover /* Even iov_base is relative to mb_addr */ 3757c9e7a6fSAndy Grover iov->iov_len = copy_bytes; 376b3c95172SChristoph Hellwig iov->iov_base = (void __user *) udev->data_off + 377b3c95172SChristoph Hellwig udev->data_head; 3787c9e7a6fSAndy Grover iov_cnt++; 3797c9e7a6fSAndy Grover iov++; 3807c9e7a6fSAndy Grover 3817c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 3827c9e7a6fSAndy Grover 3837c9e7a6fSAndy Grover /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ 3847c9e7a6fSAndy Grover if (sg->length != copy_bytes) { 3857c9e7a6fSAndy Grover from += copy_bytes; 3867c9e7a6fSAndy Grover copy_bytes = sg->length - copy_bytes; 3877c9e7a6fSAndy Grover 3887c9e7a6fSAndy Grover iov->iov_len = copy_bytes; 389b3c95172SChristoph Hellwig iov->iov_base = (void __user *) udev->data_off + 390b3c95172SChristoph Hellwig udev->data_head; 3917c9e7a6fSAndy Grover 3927c9e7a6fSAndy Grover if (se_cmd->data_direction == DMA_TO_DEVICE) { 3937c9e7a6fSAndy Grover to = (void *) mb + udev->data_off + udev->data_head; 3947c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 3957c9e7a6fSAndy Grover tcmu_flush_dcache_range(to, copy_bytes); 3967c9e7a6fSAndy Grover } 3977c9e7a6fSAndy Grover 3987c9e7a6fSAndy Grover iov_cnt++; 3997c9e7a6fSAndy Grover iov++; 4007c9e7a6fSAndy Grover 4017c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 4027c9e7a6fSAndy Grover } 4037c9e7a6fSAndy Grover 4047c9e7a6fSAndy Grover kunmap_atomic(from); 4057c9e7a6fSAndy Grover } 4067c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 4070ad46af8SAndy Grover entry->req.iov_bidi_cnt = 0; 4080ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 4097c9e7a6fSAndy Grover 4107c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 4117c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 4127c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 4137c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 4147c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4157c9e7a6fSAndy Grover 4167c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 4177c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 4187c9e7a6fSAndy Grover 4197c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4207c9e7a6fSAndy Grover 4217c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 4227c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 4237c9e7a6fSAndy Grover 4247c9e7a6fSAndy Grover mod_timer(&udev->timeout, 4257c9e7a6fSAndy Grover round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); 4267c9e7a6fSAndy Grover 4277c9e7a6fSAndy Grover return 0; 4287c9e7a6fSAndy Grover } 4297c9e7a6fSAndy Grover 4307c9e7a6fSAndy Grover static int tcmu_queue_cmd(struct se_cmd *se_cmd) 4317c9e7a6fSAndy Grover { 4327c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 4337c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 4347c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 4357c9e7a6fSAndy Grover int ret; 4367c9e7a6fSAndy Grover 4377c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 4387c9e7a6fSAndy Grover if (!tcmu_cmd) 4397c9e7a6fSAndy Grover return -ENOMEM; 4407c9e7a6fSAndy Grover 4417c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 4427c9e7a6fSAndy Grover if (ret < 0) { 4437c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 4447c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 4457c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 4467c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 4477c9e7a6fSAndy Grover 4487c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 4497c9e7a6fSAndy Grover } 4507c9e7a6fSAndy Grover 4517c9e7a6fSAndy Grover return ret; 4527c9e7a6fSAndy Grover } 4537c9e7a6fSAndy Grover 4547c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 4557c9e7a6fSAndy Grover { 4567c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 4577c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 4587c9e7a6fSAndy Grover 4597c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 4607c9e7a6fSAndy Grover /* cmd has been completed already from timeout, just reclaim data 4617c9e7a6fSAndy Grover ring space */ 4627c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4637c9e7a6fSAndy Grover return; 4647c9e7a6fSAndy Grover } 4657c9e7a6fSAndy Grover 4660ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 4670ad46af8SAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4680ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 4690ad46af8SAndy Grover cmd->se_cmd); 4700ad46af8SAndy Grover transport_generic_request_failure(cmd->se_cmd, 4710ad46af8SAndy Grover TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); 4720ad46af8SAndy Grover cmd->se_cmd = NULL; 4730ad46af8SAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 4740ad46af8SAndy Grover return; 4750ad46af8SAndy Grover } 4760ad46af8SAndy Grover 4777c9e7a6fSAndy Grover if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 4787c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 4797c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 4807c9e7a6fSAndy Grover 4817c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 4827c9e7a6fSAndy Grover } 4837c9e7a6fSAndy Grover else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 4847c9e7a6fSAndy Grover struct scatterlist *sg; 4857c9e7a6fSAndy Grover int i; 4867c9e7a6fSAndy Grover 4877c9e7a6fSAndy Grover /* It'd be easier to look at entry's iovec again, but UAM */ 4887c9e7a6fSAndy Grover for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { 4897c9e7a6fSAndy Grover size_t copy_bytes; 4907c9e7a6fSAndy Grover void *to; 4917c9e7a6fSAndy Grover void *from; 4927c9e7a6fSAndy Grover 4937c9e7a6fSAndy Grover copy_bytes = min((size_t)sg->length, 4947c9e7a6fSAndy Grover head_to_end(udev->data_tail, udev->data_size)); 4957c9e7a6fSAndy Grover 4967c9e7a6fSAndy Grover to = kmap_atomic(sg_page(sg)) + sg->offset; 4977c9e7a6fSAndy Grover WARN_ON(sg->length + sg->offset > PAGE_SIZE); 4987c9e7a6fSAndy Grover from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; 4997c9e7a6fSAndy Grover tcmu_flush_dcache_range(from, copy_bytes); 5007c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 5017c9e7a6fSAndy Grover 5027c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 5037c9e7a6fSAndy Grover 5047c9e7a6fSAndy Grover /* Uh oh, wrapped the data buffer for this sg's data */ 5057c9e7a6fSAndy Grover if (sg->length != copy_bytes) { 5067c9e7a6fSAndy Grover from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; 5077c9e7a6fSAndy Grover WARN_ON(udev->data_tail); 5087c9e7a6fSAndy Grover to += copy_bytes; 5097c9e7a6fSAndy Grover copy_bytes = sg->length - copy_bytes; 5107c9e7a6fSAndy Grover tcmu_flush_dcache_range(from, copy_bytes); 5117c9e7a6fSAndy Grover memcpy(to, from, copy_bytes); 5127c9e7a6fSAndy Grover 5137c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 5147c9e7a6fSAndy Grover } 5157c9e7a6fSAndy Grover 5167c9e7a6fSAndy Grover kunmap_atomic(to); 5177c9e7a6fSAndy Grover } 5187c9e7a6fSAndy Grover 5197c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 5207c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5217c9e7a6fSAndy Grover } else { 5227c9e7a6fSAndy Grover pr_warn("TCMU: data direction was %d!\n", se_cmd->data_direction); 5237c9e7a6fSAndy Grover } 5247c9e7a6fSAndy Grover 5257c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 5267c9e7a6fSAndy Grover cmd->se_cmd = NULL; 5277c9e7a6fSAndy Grover 5287c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 5297c9e7a6fSAndy Grover } 5307c9e7a6fSAndy Grover 5317c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 5327c9e7a6fSAndy Grover { 5337c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 5347c9e7a6fSAndy Grover LIST_HEAD(cpl_cmds); 5357c9e7a6fSAndy Grover unsigned long flags; 5367c9e7a6fSAndy Grover int handled = 0; 5377c9e7a6fSAndy Grover 5387c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 5397c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 5407c9e7a6fSAndy Grover return 0; 5417c9e7a6fSAndy Grover } 5427c9e7a6fSAndy Grover 5437c9e7a6fSAndy Grover spin_lock_irqsave(&udev->cmdr_lock, flags); 5447c9e7a6fSAndy Grover 5457c9e7a6fSAndy Grover mb = udev->mb_addr; 5467c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5477c9e7a6fSAndy Grover 5487c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 5497c9e7a6fSAndy Grover 5507c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 5517c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 5527c9e7a6fSAndy Grover 5537c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 5547c9e7a6fSAndy Grover 5550ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 5560ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 5570ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 5580ad46af8SAndy Grover udev->cmdr_size); 5597c9e7a6fSAndy Grover continue; 5607c9e7a6fSAndy Grover } 5610ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 5627c9e7a6fSAndy Grover 5637c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 5640ad46af8SAndy Grover cmd = idr_find(&udev->commands, entry->hdr.cmd_id); 5657c9e7a6fSAndy Grover if (cmd) 5667c9e7a6fSAndy Grover idr_remove(&udev->commands, cmd->cmd_id); 5677c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 5687c9e7a6fSAndy Grover 5697c9e7a6fSAndy Grover if (!cmd) { 5707c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 5717c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 5727c9e7a6fSAndy Grover break; 5737c9e7a6fSAndy Grover } 5747c9e7a6fSAndy Grover 5757c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 5767c9e7a6fSAndy Grover 5770ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 5780ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 5790ad46af8SAndy Grover udev->cmdr_size); 5807c9e7a6fSAndy Grover 5817c9e7a6fSAndy Grover handled++; 5827c9e7a6fSAndy Grover } 5837c9e7a6fSAndy Grover 5847c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 5857c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 5867c9e7a6fSAndy Grover 5877c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->cmdr_lock, flags); 5887c9e7a6fSAndy Grover 5897c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 5907c9e7a6fSAndy Grover 5917c9e7a6fSAndy Grover return handled; 5927c9e7a6fSAndy Grover } 5937c9e7a6fSAndy Grover 5947c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 5957c9e7a6fSAndy Grover { 5967c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 5977c9e7a6fSAndy Grover 5987c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 5997c9e7a6fSAndy Grover return 0; 6007c9e7a6fSAndy Grover 6017c9e7a6fSAndy Grover if (!time_after(cmd->deadline, jiffies)) 6027c9e7a6fSAndy Grover return 0; 6037c9e7a6fSAndy Grover 6047c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 6057c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 6067c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6077c9e7a6fSAndy Grover 6087c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6097c9e7a6fSAndy Grover 6107c9e7a6fSAndy Grover return 0; 6117c9e7a6fSAndy Grover } 6127c9e7a6fSAndy Grover 6137c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 6147c9e7a6fSAndy Grover { 6157c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 6167c9e7a6fSAndy Grover unsigned long flags; 6177c9e7a6fSAndy Grover int handled; 6187c9e7a6fSAndy Grover 6197c9e7a6fSAndy Grover handled = tcmu_handle_completions(udev); 6207c9e7a6fSAndy Grover 6217c9e7a6fSAndy Grover pr_warn("%d completions handled from timeout\n", handled); 6227c9e7a6fSAndy Grover 6237c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 6247c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 6257c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 6267c9e7a6fSAndy Grover 6277c9e7a6fSAndy Grover /* 6287c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 6297c9e7a6fSAndy Grover * own timeout. 6307c9e7a6fSAndy Grover */ 6317c9e7a6fSAndy Grover } 6327c9e7a6fSAndy Grover 6337c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 6347c9e7a6fSAndy Grover { 6357c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 6367c9e7a6fSAndy Grover 6377c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 6387c9e7a6fSAndy Grover if (!tcmu_hba) 6397c9e7a6fSAndy Grover return -ENOMEM; 6407c9e7a6fSAndy Grover 6417c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 6427c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 6437c9e7a6fSAndy Grover 6447c9e7a6fSAndy Grover return 0; 6457c9e7a6fSAndy Grover } 6467c9e7a6fSAndy Grover 6477c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 6487c9e7a6fSAndy Grover { 6497c9e7a6fSAndy Grover kfree(hba->hba_ptr); 6507c9e7a6fSAndy Grover hba->hba_ptr = NULL; 6517c9e7a6fSAndy Grover } 6527c9e7a6fSAndy Grover 6537c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 6547c9e7a6fSAndy Grover { 6557c9e7a6fSAndy Grover struct tcmu_dev *udev; 6567c9e7a6fSAndy Grover 6577c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 6587c9e7a6fSAndy Grover if (!udev) 6597c9e7a6fSAndy Grover return NULL; 6607c9e7a6fSAndy Grover 6617c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 6627c9e7a6fSAndy Grover if (!udev->name) { 6637c9e7a6fSAndy Grover kfree(udev); 6647c9e7a6fSAndy Grover return NULL; 6657c9e7a6fSAndy Grover } 6667c9e7a6fSAndy Grover 6677c9e7a6fSAndy Grover udev->hba = hba; 6687c9e7a6fSAndy Grover 6697c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 6707c9e7a6fSAndy Grover spin_lock_init(&udev->cmdr_lock); 6717c9e7a6fSAndy Grover 6727c9e7a6fSAndy Grover idr_init(&udev->commands); 6737c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 6747c9e7a6fSAndy Grover 6757c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 6767c9e7a6fSAndy Grover (unsigned long)udev); 6777c9e7a6fSAndy Grover 6787c9e7a6fSAndy Grover return &udev->se_dev; 6797c9e7a6fSAndy Grover } 6807c9e7a6fSAndy Grover 6817c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 6827c9e7a6fSAndy Grover { 6837c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 6847c9e7a6fSAndy Grover 6857c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 6867c9e7a6fSAndy Grover 6877c9e7a6fSAndy Grover return 0; 6887c9e7a6fSAndy Grover } 6897c9e7a6fSAndy Grover 6907c9e7a6fSAndy Grover /* 6917c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 6927c9e7a6fSAndy Grover * and this stuff must come along. 6937c9e7a6fSAndy Grover */ 6947c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 6957c9e7a6fSAndy Grover { 6967c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 6977c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 6987c9e7a6fSAndy Grover 6997c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 7007c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 7017c9e7a6fSAndy Grover return -1; 7027c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 7037c9e7a6fSAndy Grover } 7047c9e7a6fSAndy Grover return -1; 7057c9e7a6fSAndy Grover } 7067c9e7a6fSAndy Grover 7077c9e7a6fSAndy Grover static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7087c9e7a6fSAndy Grover { 7097c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7107c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7117c9e7a6fSAndy Grover struct page *page; 7127c9e7a6fSAndy Grover unsigned long offset; 7137c9e7a6fSAndy Grover void *addr; 7147c9e7a6fSAndy Grover 7157c9e7a6fSAndy Grover int mi = tcmu_find_mem_index(vma); 7167c9e7a6fSAndy Grover if (mi < 0) 7177c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 7187c9e7a6fSAndy Grover 7197c9e7a6fSAndy Grover /* 7207c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 7217c9e7a6fSAndy Grover * to use mem[N]. 7227c9e7a6fSAndy Grover */ 7237c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 7247c9e7a6fSAndy Grover 7257c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 7267c9e7a6fSAndy Grover if (info->mem[mi].memtype == UIO_MEM_LOGICAL) 7277c9e7a6fSAndy Grover page = virt_to_page(addr); 7287c9e7a6fSAndy Grover else 7297c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 7307c9e7a6fSAndy Grover get_page(page); 7317c9e7a6fSAndy Grover vmf->page = page; 7327c9e7a6fSAndy Grover return 0; 7337c9e7a6fSAndy Grover } 7347c9e7a6fSAndy Grover 7357c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 7367c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 7377c9e7a6fSAndy Grover }; 7387c9e7a6fSAndy Grover 7397c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 7407c9e7a6fSAndy Grover { 7417c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7427c9e7a6fSAndy Grover 7437c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7447c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 7457c9e7a6fSAndy Grover 7467c9e7a6fSAndy Grover vma->vm_private_data = udev; 7477c9e7a6fSAndy Grover 7487c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 7497c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 7507c9e7a6fSAndy Grover return -EINVAL; 7517c9e7a6fSAndy Grover 7527c9e7a6fSAndy Grover return 0; 7537c9e7a6fSAndy Grover } 7547c9e7a6fSAndy Grover 7557c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 7567c9e7a6fSAndy Grover { 7577c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7587c9e7a6fSAndy Grover 7597c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 7607c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 7617c9e7a6fSAndy Grover return -EBUSY; 7627c9e7a6fSAndy Grover 7637c9e7a6fSAndy Grover pr_debug("open\n"); 7647c9e7a6fSAndy Grover 7657c9e7a6fSAndy Grover return 0; 7667c9e7a6fSAndy Grover } 7677c9e7a6fSAndy Grover 7687c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 7697c9e7a6fSAndy Grover { 7707c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7717c9e7a6fSAndy Grover 7727c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 7737c9e7a6fSAndy Grover 7747c9e7a6fSAndy Grover pr_debug("close\n"); 7757c9e7a6fSAndy Grover 7767c9e7a6fSAndy Grover return 0; 7777c9e7a6fSAndy Grover } 7787c9e7a6fSAndy Grover 7797c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 7807c9e7a6fSAndy Grover { 7817c9e7a6fSAndy Grover struct sk_buff *skb; 7827c9e7a6fSAndy Grover void *msg_header; 7836e14eab9SNicholas Bellinger int ret = -ENOMEM; 7847c9e7a6fSAndy Grover 7857c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 7867c9e7a6fSAndy Grover if (!skb) 7876e14eab9SNicholas Bellinger return ret; 7887c9e7a6fSAndy Grover 7897c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 7906e14eab9SNicholas Bellinger if (!msg_header) 7916e14eab9SNicholas Bellinger goto free_skb; 7927c9e7a6fSAndy Grover 7937c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 7946e14eab9SNicholas Bellinger if (ret < 0) 7956e14eab9SNicholas Bellinger goto free_skb; 7967c9e7a6fSAndy Grover 7977c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 7986e14eab9SNicholas Bellinger if (ret < 0) 7996e14eab9SNicholas Bellinger goto free_skb; 8007c9e7a6fSAndy Grover 801053c095aSJohannes Berg genlmsg_end(skb, msg_header); 8027c9e7a6fSAndy Grover 8037c9e7a6fSAndy Grover ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, 8047c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 8057c9e7a6fSAndy Grover 8067c9e7a6fSAndy Grover /* We don't care if no one is listening */ 8077c9e7a6fSAndy Grover if (ret == -ESRCH) 8087c9e7a6fSAndy Grover ret = 0; 8097c9e7a6fSAndy Grover 8107c9e7a6fSAndy Grover return ret; 8116e14eab9SNicholas Bellinger free_skb: 8126e14eab9SNicholas Bellinger nlmsg_free(skb); 8136e14eab9SNicholas Bellinger return ret; 8147c9e7a6fSAndy Grover } 8157c9e7a6fSAndy Grover 8167c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 8177c9e7a6fSAndy Grover { 8187c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 8197c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 8207c9e7a6fSAndy Grover struct uio_info *info; 8217c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8227c9e7a6fSAndy Grover size_t size; 8237c9e7a6fSAndy Grover size_t used; 8247c9e7a6fSAndy Grover int ret = 0; 8257c9e7a6fSAndy Grover char *str; 8267c9e7a6fSAndy Grover 8277c9e7a6fSAndy Grover info = &udev->uio_info; 8287c9e7a6fSAndy Grover 8297c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 8307c9e7a6fSAndy Grover udev->dev_config); 8317c9e7a6fSAndy Grover size += 1; /* for \0 */ 8327c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 8337c9e7a6fSAndy Grover if (!str) 8347c9e7a6fSAndy Grover return -ENOMEM; 8357c9e7a6fSAndy Grover 8367c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 8377c9e7a6fSAndy Grover 8387c9e7a6fSAndy Grover if (udev->dev_config[0]) 8397c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 8407c9e7a6fSAndy Grover 8417c9e7a6fSAndy Grover info->name = str; 8427c9e7a6fSAndy Grover 8437c9e7a6fSAndy Grover udev->mb_addr = vzalloc(TCMU_RING_SIZE); 8447c9e7a6fSAndy Grover if (!udev->mb_addr) { 8457c9e7a6fSAndy Grover ret = -ENOMEM; 8467c9e7a6fSAndy Grover goto err_vzalloc; 8477c9e7a6fSAndy Grover } 8487c9e7a6fSAndy Grover 8497c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 8507c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 8517c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 8527c9e7a6fSAndy Grover udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; 8537c9e7a6fSAndy Grover 8547c9e7a6fSAndy Grover mb = udev->mb_addr; 8550ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 8567c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 8577c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 8587c9e7a6fSAndy Grover 8597c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 8607c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 8617c9e7a6fSAndy Grover 8620ad46af8SAndy Grover info->version = xstr(TCMU_MAILBOX_VERSION); 8637c9e7a6fSAndy Grover 8647c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 8657c9e7a6fSAndy Grover info->mem[0].addr = (phys_addr_t) udev->mb_addr; 8667c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 8677c9e7a6fSAndy Grover info->mem[0].memtype = UIO_MEM_VIRTUAL; 8687c9e7a6fSAndy Grover 8697c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 8707c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 8717c9e7a6fSAndy Grover 8727c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 8737c9e7a6fSAndy Grover info->open = tcmu_open; 8747c9e7a6fSAndy Grover info->release = tcmu_release; 8757c9e7a6fSAndy Grover 8767c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 8777c9e7a6fSAndy Grover if (ret) 8787c9e7a6fSAndy Grover goto err_register; 8797c9e7a6fSAndy Grover 8807c9e7a6fSAndy Grover /* Other attributes can be configured in userspace */ 8817c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 8827c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 8837c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 8847c9e7a6fSAndy Grover 8857c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 8867c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 8877c9e7a6fSAndy Grover if (ret) 8887c9e7a6fSAndy Grover goto err_netlink; 8897c9e7a6fSAndy Grover 8907c9e7a6fSAndy Grover return 0; 8917c9e7a6fSAndy Grover 8927c9e7a6fSAndy Grover err_netlink: 8937c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 8947c9e7a6fSAndy Grover err_register: 8957c9e7a6fSAndy Grover vfree(udev->mb_addr); 8967c9e7a6fSAndy Grover err_vzalloc: 8977c9e7a6fSAndy Grover kfree(info->name); 8987c9e7a6fSAndy Grover 8997c9e7a6fSAndy Grover return ret; 9007c9e7a6fSAndy Grover } 9017c9e7a6fSAndy Grover 9027c9e7a6fSAndy Grover static int tcmu_check_pending_cmd(int id, void *p, void *data) 9037c9e7a6fSAndy Grover { 9047c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 9057c9e7a6fSAndy Grover 9067c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 9077c9e7a6fSAndy Grover return 0; 9087c9e7a6fSAndy Grover return -EINVAL; 9097c9e7a6fSAndy Grover } 9107c9e7a6fSAndy Grover 9117c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 9127c9e7a6fSAndy Grover { 9137c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9147c9e7a6fSAndy Grover int i; 9157c9e7a6fSAndy Grover 9167c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 9177c9e7a6fSAndy Grover 9187c9e7a6fSAndy Grover vfree(udev->mb_addr); 9197c9e7a6fSAndy Grover 9207c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 9217c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 9227c9e7a6fSAndy Grover i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); 9237c9e7a6fSAndy Grover idr_destroy(&udev->commands); 9247c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 9257c9e7a6fSAndy Grover WARN_ON(i); 9267c9e7a6fSAndy Grover 9277c9e7a6fSAndy Grover /* Device was configured */ 9287c9e7a6fSAndy Grover if (udev->uio_info.uio_dev) { 9297c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 9307c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9317c9e7a6fSAndy Grover 9327c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9337c9e7a6fSAndy Grover kfree(udev->uio_info.name); 9347c9e7a6fSAndy Grover kfree(udev->name); 9357c9e7a6fSAndy Grover } 9367c9e7a6fSAndy Grover 9377c9e7a6fSAndy Grover kfree(udev); 9387c9e7a6fSAndy Grover } 9397c9e7a6fSAndy Grover 9407c9e7a6fSAndy Grover enum { 9419c1cd1b6SAndy Grover Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, 9427c9e7a6fSAndy Grover }; 9437c9e7a6fSAndy Grover 9447c9e7a6fSAndy Grover static match_table_t tokens = { 9457c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 9467c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 9479c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 9487c9e7a6fSAndy Grover {Opt_err, NULL} 9497c9e7a6fSAndy Grover }; 9507c9e7a6fSAndy Grover 9517c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 9527c9e7a6fSAndy Grover const char *page, ssize_t count) 9537c9e7a6fSAndy Grover { 9547c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9557c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 9567c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 9577c9e7a6fSAndy Grover int ret = 0, token; 9589c1cd1b6SAndy Grover unsigned long tmp_ul; 9597c9e7a6fSAndy Grover 9607c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 9617c9e7a6fSAndy Grover if (!opts) 9627c9e7a6fSAndy Grover return -ENOMEM; 9637c9e7a6fSAndy Grover 9647c9e7a6fSAndy Grover orig = opts; 9657c9e7a6fSAndy Grover 9667c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 9677c9e7a6fSAndy Grover if (!*ptr) 9687c9e7a6fSAndy Grover continue; 9697c9e7a6fSAndy Grover 9707c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 9717c9e7a6fSAndy Grover switch (token) { 9727c9e7a6fSAndy Grover case Opt_dev_config: 9737c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 9747c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 9757c9e7a6fSAndy Grover ret = -EINVAL; 9767c9e7a6fSAndy Grover break; 9777c9e7a6fSAndy Grover } 9787c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 9797c9e7a6fSAndy Grover break; 9807c9e7a6fSAndy Grover case Opt_dev_size: 9817c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 9827c9e7a6fSAndy Grover if (!arg_p) { 9837c9e7a6fSAndy Grover ret = -ENOMEM; 9847c9e7a6fSAndy Grover break; 9857c9e7a6fSAndy Grover } 9867c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 9877c9e7a6fSAndy Grover kfree(arg_p); 9887c9e7a6fSAndy Grover if (ret < 0) 9897c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 9907c9e7a6fSAndy Grover break; 9919c1cd1b6SAndy Grover case Opt_hw_block_size: 9929c1cd1b6SAndy Grover arg_p = match_strdup(&args[0]); 9939c1cd1b6SAndy Grover if (!arg_p) { 9949c1cd1b6SAndy Grover ret = -ENOMEM; 9959c1cd1b6SAndy Grover break; 9969c1cd1b6SAndy Grover } 9979c1cd1b6SAndy Grover ret = kstrtoul(arg_p, 0, &tmp_ul); 9989c1cd1b6SAndy Grover kfree(arg_p); 9999c1cd1b6SAndy Grover if (ret < 0) { 10009c1cd1b6SAndy Grover pr_err("kstrtoul() failed for hw_block_size=\n"); 10019c1cd1b6SAndy Grover break; 10029c1cd1b6SAndy Grover } 10039c1cd1b6SAndy Grover if (!tmp_ul) { 10049c1cd1b6SAndy Grover pr_err("hw_block_size must be nonzero\n"); 10059c1cd1b6SAndy Grover break; 10069c1cd1b6SAndy Grover } 10079c1cd1b6SAndy Grover dev->dev_attrib.hw_block_size = tmp_ul; 10089c1cd1b6SAndy Grover break; 10097c9e7a6fSAndy Grover default: 10107c9e7a6fSAndy Grover break; 10117c9e7a6fSAndy Grover } 10127c9e7a6fSAndy Grover } 10137c9e7a6fSAndy Grover 10147c9e7a6fSAndy Grover kfree(orig); 10157c9e7a6fSAndy Grover return (!ret) ? count : ret; 10167c9e7a6fSAndy Grover } 10177c9e7a6fSAndy Grover 10187c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 10197c9e7a6fSAndy Grover { 10207c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10217c9e7a6fSAndy Grover ssize_t bl = 0; 10227c9e7a6fSAndy Grover 10237c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 10247c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 10258ee83a74SAndy Grover bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 10267c9e7a6fSAndy Grover 10277c9e7a6fSAndy Grover return bl; 10287c9e7a6fSAndy Grover } 10297c9e7a6fSAndy Grover 10307c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 10317c9e7a6fSAndy Grover { 10327c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10337c9e7a6fSAndy Grover 10347c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 10357c9e7a6fSAndy Grover dev->dev_attrib.block_size); 10367c9e7a6fSAndy Grover } 10377c9e7a6fSAndy Grover 10387c9e7a6fSAndy Grover static sense_reason_t 10397c9e7a6fSAndy Grover tcmu_pass_op(struct se_cmd *se_cmd) 10407c9e7a6fSAndy Grover { 10417c9e7a6fSAndy Grover int ret = tcmu_queue_cmd(se_cmd); 10427c9e7a6fSAndy Grover 10437c9e7a6fSAndy Grover if (ret != 0) 10447c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10457c9e7a6fSAndy Grover else 10467c9e7a6fSAndy Grover return TCM_NO_SENSE; 10477c9e7a6fSAndy Grover } 10487c9e7a6fSAndy Grover 10497c9e7a6fSAndy Grover static sense_reason_t 10507c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 10517c9e7a6fSAndy Grover { 10529c1cd1b6SAndy Grover unsigned char *cdb = cmd->t_task_cdb; 10539c1cd1b6SAndy Grover 10549c1cd1b6SAndy Grover /* 10559c1cd1b6SAndy Grover * For REPORT LUNS we always need to emulate the response, for everything 10569c1cd1b6SAndy Grover * else, pass it up. 10579c1cd1b6SAndy Grover */ 10589c1cd1b6SAndy Grover if (cdb[0] == REPORT_LUNS) { 10599c1cd1b6SAndy Grover cmd->execute_cmd = spc_emulate_report_luns; 10609c1cd1b6SAndy Grover return TCM_NO_SENSE; 10617c9e7a6fSAndy Grover } 10627c9e7a6fSAndy Grover 10639c1cd1b6SAndy Grover /* Set DATA_CDB flag for ops that should have it */ 10649c1cd1b6SAndy Grover switch (cdb[0]) { 10659c1cd1b6SAndy Grover case READ_6: 10669c1cd1b6SAndy Grover case READ_10: 10679c1cd1b6SAndy Grover case READ_12: 10689c1cd1b6SAndy Grover case READ_16: 10699c1cd1b6SAndy Grover case WRITE_6: 10709c1cd1b6SAndy Grover case WRITE_10: 10719c1cd1b6SAndy Grover case WRITE_12: 10729c1cd1b6SAndy Grover case WRITE_16: 10739c1cd1b6SAndy Grover case WRITE_VERIFY: 10749c1cd1b6SAndy Grover case WRITE_VERIFY_12: 10759c1cd1b6SAndy Grover case 0x8e: /* WRITE_VERIFY_16 */ 10769c1cd1b6SAndy Grover case COMPARE_AND_WRITE: 10779c1cd1b6SAndy Grover case XDWRITEREAD_10: 10789c1cd1b6SAndy Grover cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 10799c1cd1b6SAndy Grover break; 10809c1cd1b6SAndy Grover case VARIABLE_LENGTH_CMD: 10819c1cd1b6SAndy Grover switch (get_unaligned_be16(&cdb[8])) { 10829c1cd1b6SAndy Grover case READ_32: 10839c1cd1b6SAndy Grover case WRITE_32: 10849c1cd1b6SAndy Grover case 0x0c: /* WRITE_VERIFY_32 */ 10859c1cd1b6SAndy Grover case XDWRITEREAD_32: 10869c1cd1b6SAndy Grover cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 10879c1cd1b6SAndy Grover break; 10889c1cd1b6SAndy Grover } 10899c1cd1b6SAndy Grover } 10909c1cd1b6SAndy Grover 10919c1cd1b6SAndy Grover cmd->execute_cmd = tcmu_pass_op; 10929c1cd1b6SAndy Grover 10939c1cd1b6SAndy Grover return TCM_NO_SENSE; 10949c1cd1b6SAndy Grover } 10959c1cd1b6SAndy Grover 10969c1cd1b6SAndy Grover DEF_TB_DEV_ATTRIB_RO(tcmu, hw_pi_prot_type); 10979c1cd1b6SAndy Grover TB_DEV_ATTR_RO(tcmu, hw_pi_prot_type); 10989c1cd1b6SAndy Grover 10999c1cd1b6SAndy Grover DEF_TB_DEV_ATTRIB_RO(tcmu, hw_block_size); 11009c1cd1b6SAndy Grover TB_DEV_ATTR_RO(tcmu, hw_block_size); 11019c1cd1b6SAndy Grover 11029c1cd1b6SAndy Grover DEF_TB_DEV_ATTRIB_RO(tcmu, hw_max_sectors); 11039c1cd1b6SAndy Grover TB_DEV_ATTR_RO(tcmu, hw_max_sectors); 11049c1cd1b6SAndy Grover 11059c1cd1b6SAndy Grover DEF_TB_DEV_ATTRIB_RO(tcmu, hw_queue_depth); 11069c1cd1b6SAndy Grover TB_DEV_ATTR_RO(tcmu, hw_queue_depth); 1107e9f720d6SNicholas Bellinger 1108e9f720d6SNicholas Bellinger static struct configfs_attribute *tcmu_backend_dev_attrs[] = { 1109e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_pi_prot_type.attr, 1110e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_block_size.attr, 1111e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_max_sectors.attr, 1112e9f720d6SNicholas Bellinger &tcmu_dev_attrib_hw_queue_depth.attr, 1113e9f720d6SNicholas Bellinger NULL, 1114e9f720d6SNicholas Bellinger }; 1115e9f720d6SNicholas Bellinger 11167c9e7a6fSAndy Grover static struct se_subsystem_api tcmu_template = { 11177c9e7a6fSAndy Grover .name = "user", 11187c9e7a6fSAndy Grover .inquiry_prod = "USER", 11197c9e7a6fSAndy Grover .inquiry_rev = TCMU_VERSION, 11207c9e7a6fSAndy Grover .owner = THIS_MODULE, 11219c1cd1b6SAndy Grover .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, 11227c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 11237c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 11247c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 11257c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 11267c9e7a6fSAndy Grover .free_device = tcmu_free_device, 11277c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 11287c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 11297c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 11307c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 11317c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 11327c9e7a6fSAndy Grover }; 11337c9e7a6fSAndy Grover 11347c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 11357c9e7a6fSAndy Grover { 1136e9f720d6SNicholas Bellinger struct target_backend_cits *tbc = &tcmu_template.tb_cits; 11377c9e7a6fSAndy Grover int ret; 11387c9e7a6fSAndy Grover 11397c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 11407c9e7a6fSAndy Grover 11417c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 11427c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 11437c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 11447c9e7a6fSAndy Grover 0, NULL); 11457c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 11467c9e7a6fSAndy Grover return -ENOMEM; 11477c9e7a6fSAndy Grover 11487c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 11497c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 11507c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 11517c9e7a6fSAndy Grover goto out_free_cache; 11527c9e7a6fSAndy Grover } 11537c9e7a6fSAndy Grover 11547c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 11557c9e7a6fSAndy Grover if (ret < 0) { 11567c9e7a6fSAndy Grover goto out_unreg_device; 11577c9e7a6fSAndy Grover } 11587c9e7a6fSAndy Grover 1159e9f720d6SNicholas Bellinger target_core_setup_sub_cits(&tcmu_template); 1160e9f720d6SNicholas Bellinger tbc->tb_dev_attrib_cit.ct_attrs = tcmu_backend_dev_attrs; 1161e9f720d6SNicholas Bellinger 11627c9e7a6fSAndy Grover ret = transport_subsystem_register(&tcmu_template); 11637c9e7a6fSAndy Grover if (ret) 11647c9e7a6fSAndy Grover goto out_unreg_genl; 11657c9e7a6fSAndy Grover 11667c9e7a6fSAndy Grover return 0; 11677c9e7a6fSAndy Grover 11687c9e7a6fSAndy Grover out_unreg_genl: 11697c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11707c9e7a6fSAndy Grover out_unreg_device: 11717c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11727c9e7a6fSAndy Grover out_free_cache: 11737c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11747c9e7a6fSAndy Grover 11757c9e7a6fSAndy Grover return ret; 11767c9e7a6fSAndy Grover } 11777c9e7a6fSAndy Grover 11787c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 11797c9e7a6fSAndy Grover { 11807c9e7a6fSAndy Grover transport_subsystem_release(&tcmu_template); 11817c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11827c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11837c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11847c9e7a6fSAndy Grover } 11857c9e7a6fSAndy Grover 11867c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 11877c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 11887c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 11897c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 11907c9e7a6fSAndy Grover 11917c9e7a6fSAndy Grover module_init(tcmu_module_init); 11927c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1193