17c9e7a6fSAndy Grover /* 27c9e7a6fSAndy Grover * Copyright (C) 2013 Shaohua Li <shli@kernel.org> 37c9e7a6fSAndy Grover * Copyright (C) 2014 Red Hat, Inc. 4f97ec7dbSIlias Tsitsimpis * Copyright (C) 2015 Arrikto, Inc. 57c9e7a6fSAndy Grover * 67c9e7a6fSAndy Grover * This program is free software; you can redistribute it and/or modify it 77c9e7a6fSAndy Grover * under the terms and conditions of the GNU General Public License, 87c9e7a6fSAndy Grover * version 2, as published by the Free Software Foundation. 97c9e7a6fSAndy Grover * 107c9e7a6fSAndy Grover * This program is distributed in the hope it will be useful, but WITHOUT 117c9e7a6fSAndy Grover * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 127c9e7a6fSAndy Grover * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 137c9e7a6fSAndy Grover * more details. 147c9e7a6fSAndy Grover * 157c9e7a6fSAndy Grover * You should have received a copy of the GNU General Public License along with 167c9e7a6fSAndy Grover * this program; if not, write to the Free Software Foundation, Inc., 177c9e7a6fSAndy Grover * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 187c9e7a6fSAndy Grover */ 197c9e7a6fSAndy Grover 207c9e7a6fSAndy Grover #include <linux/spinlock.h> 217c9e7a6fSAndy Grover #include <linux/module.h> 227c9e7a6fSAndy Grover #include <linux/idr.h> 23ba929992SBart Van Assche #include <linux/kernel.h> 247c9e7a6fSAndy Grover #include <linux/timer.h> 257c9e7a6fSAndy Grover #include <linux/parser.h> 265538d294SDavid S. Miller #include <linux/vmalloc.h> 277c9e7a6fSAndy Grover #include <linux/uio_driver.h> 28ac64a2ceSDavid Disseldorp #include <linux/stringify.h> 297c9e7a6fSAndy Grover #include <net/genetlink.h> 30ba929992SBart Van Assche #include <scsi/scsi_common.h> 31ba929992SBart Van Assche #include <scsi/scsi_proto.h> 327c9e7a6fSAndy Grover #include <target/target_core_base.h> 337c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 347c9e7a6fSAndy Grover #include <target/target_core_backend.h> 35e9f720d6SNicholas Bellinger 367c9e7a6fSAndy Grover #include <linux/target_core_user.h> 377c9e7a6fSAndy Grover 387c9e7a6fSAndy Grover /* 397c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 407c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 417c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 427c9e7a6fSAndy Grover * 437c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 447c9e7a6fSAndy Grover * introspection work for us. 457c9e7a6fSAndy Grover * 467c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 477c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 487c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 497c9e7a6fSAndy Grover * internal to the mmap()ed area. There is separate space outside the 507c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 517c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 527c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 537c9e7a6fSAndy Grover * 547c9e7a6fSAndy Grover * SECURITY: 557c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 567c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 577c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 587c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 597c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 607c9e7a6fSAndy Grover * this may have a 'UAM' comment. 617c9e7a6fSAndy Grover */ 627c9e7a6fSAndy Grover 637c9e7a6fSAndy Grover 647c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 657c9e7a6fSAndy Grover 667c9e7a6fSAndy Grover #define CMDR_SIZE (16 * 4096) 677c9e7a6fSAndy Grover #define DATA_SIZE (257 * 4096) 687c9e7a6fSAndy Grover 697c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 707c9e7a6fSAndy Grover 717c9e7a6fSAndy Grover static struct device *tcmu_root_device; 727c9e7a6fSAndy Grover 737c9e7a6fSAndy Grover struct tcmu_hba { 747c9e7a6fSAndy Grover u32 host_id; 757c9e7a6fSAndy Grover }; 767c9e7a6fSAndy Grover 777c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 787c9e7a6fSAndy Grover 797c9e7a6fSAndy Grover struct tcmu_dev { 807c9e7a6fSAndy Grover struct se_device se_dev; 817c9e7a6fSAndy Grover 827c9e7a6fSAndy Grover char *name; 837c9e7a6fSAndy Grover struct se_hba *hba; 847c9e7a6fSAndy Grover 857c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 867c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 877c9e7a6fSAndy Grover unsigned long flags; 887c9e7a6fSAndy Grover 897c9e7a6fSAndy Grover struct uio_info uio_info; 907c9e7a6fSAndy Grover 917c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 927c9e7a6fSAndy Grover size_t dev_size; 937c9e7a6fSAndy Grover u32 cmdr_size; 947c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 957c9e7a6fSAndy Grover /* Offset of data ring from start of mb */ 967c9e7a6fSAndy Grover size_t data_off; 977c9e7a6fSAndy Grover size_t data_size; 987c9e7a6fSAndy Grover /* Ring head + tail values. */ 997c9e7a6fSAndy Grover /* Must add data_off and mb_addr to get the address */ 1007c9e7a6fSAndy Grover size_t data_head; 1017c9e7a6fSAndy Grover size_t data_tail; 1027c9e7a6fSAndy Grover 1037c9e7a6fSAndy Grover wait_queue_head_t wait_cmdr; 1047c9e7a6fSAndy Grover /* TODO should this be a mutex? */ 1057c9e7a6fSAndy Grover spinlock_t cmdr_lock; 1067c9e7a6fSAndy Grover 1077c9e7a6fSAndy Grover struct idr commands; 1087c9e7a6fSAndy Grover spinlock_t commands_lock; 1097c9e7a6fSAndy Grover 1107c9e7a6fSAndy Grover struct timer_list timeout; 1117c9e7a6fSAndy Grover 1127c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 1137c9e7a6fSAndy Grover }; 1147c9e7a6fSAndy Grover 1157c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1167c9e7a6fSAndy Grover 1177c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1187c9e7a6fSAndy Grover 1197c9e7a6fSAndy Grover struct tcmu_cmd { 1207c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1217c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 1227c9e7a6fSAndy Grover 1237c9e7a6fSAndy Grover uint16_t cmd_id; 1247c9e7a6fSAndy Grover 1257c9e7a6fSAndy Grover /* Can't use se_cmd->data_length when cleaning up expired cmds, because if 1267c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 1277c9e7a6fSAndy Grover size_t data_length; 1287c9e7a6fSAndy Grover 1297c9e7a6fSAndy Grover unsigned long deadline; 1307c9e7a6fSAndy Grover 1317c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1327c9e7a6fSAndy Grover unsigned long flags; 1337c9e7a6fSAndy Grover }; 1347c9e7a6fSAndy Grover 1357c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 1367c9e7a6fSAndy Grover 1377c9e7a6fSAndy Grover /* multicast group */ 1387c9e7a6fSAndy Grover enum tcmu_multicast_groups { 1397c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 1407c9e7a6fSAndy Grover }; 1417c9e7a6fSAndy Grover 1427c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 1437c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 1447c9e7a6fSAndy Grover }; 1457c9e7a6fSAndy Grover 1467c9e7a6fSAndy Grover /* Our generic netlink family */ 1477c9e7a6fSAndy Grover static struct genl_family tcmu_genl_family = { 1487c9e7a6fSAndy Grover .id = GENL_ID_GENERATE, 1497c9e7a6fSAndy Grover .hdrsize = 0, 1507c9e7a6fSAndy Grover .name = "TCM-USER", 1517c9e7a6fSAndy Grover .version = 1, 1527c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 1537c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 1547c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 1557c9e7a6fSAndy Grover }; 1567c9e7a6fSAndy Grover 1577c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 1587c9e7a6fSAndy Grover { 1597c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 1607c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 1617c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1627c9e7a6fSAndy Grover int cmd_id; 1637c9e7a6fSAndy Grover 1647c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 1657c9e7a6fSAndy Grover if (!tcmu_cmd) 1667c9e7a6fSAndy Grover return NULL; 1677c9e7a6fSAndy Grover 1687c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 1697c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 1707c9e7a6fSAndy Grover tcmu_cmd->data_length = se_cmd->data_length; 1717c9e7a6fSAndy Grover 172e4648b01SIlias Tsitsimpis if (se_cmd->se_cmd_flags & SCF_BIDI) { 173e4648b01SIlias Tsitsimpis BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 174e4648b01SIlias Tsitsimpis tcmu_cmd->data_length += se_cmd->t_bidi_data_sg->length; 175e4648b01SIlias Tsitsimpis } 176e4648b01SIlias Tsitsimpis 1777c9e7a6fSAndy Grover tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); 1787c9e7a6fSAndy Grover 1797c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 1807c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1817c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 1827c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 1837c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1847c9e7a6fSAndy Grover idr_preload_end(); 1857c9e7a6fSAndy Grover 1867c9e7a6fSAndy Grover if (cmd_id < 0) { 1877c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 1887c9e7a6fSAndy Grover return NULL; 1897c9e7a6fSAndy Grover } 1907c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 1917c9e7a6fSAndy Grover 1927c9e7a6fSAndy Grover return tcmu_cmd; 1937c9e7a6fSAndy Grover } 1947c9e7a6fSAndy Grover 1957c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 1967c9e7a6fSAndy Grover { 197b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 1987c9e7a6fSAndy Grover 1997c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 2007c9e7a6fSAndy Grover vaddr -= offset; 2017c9e7a6fSAndy Grover 2027c9e7a6fSAndy Grover while (size) { 2037c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 2047c9e7a6fSAndy Grover size -= PAGE_SIZE; 2057c9e7a6fSAndy Grover } 2067c9e7a6fSAndy Grover } 2077c9e7a6fSAndy Grover 2087c9e7a6fSAndy Grover /* 2097c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 2107c9e7a6fSAndy Grover * we can't use circ_buf.h. 2117c9e7a6fSAndy Grover */ 2127c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 2137c9e7a6fSAndy Grover { 2147c9e7a6fSAndy Grover int diff = head - tail; 2157c9e7a6fSAndy Grover 2167c9e7a6fSAndy Grover if (diff >= 0) 2177c9e7a6fSAndy Grover return diff; 2187c9e7a6fSAndy Grover else 2197c9e7a6fSAndy Grover return size + diff; 2207c9e7a6fSAndy Grover } 2217c9e7a6fSAndy Grover 2227c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 2237c9e7a6fSAndy Grover { 2247c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 2257c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 2267c9e7a6fSAndy Grover } 2277c9e7a6fSAndy Grover 2287c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 2297c9e7a6fSAndy Grover { 2307c9e7a6fSAndy Grover return size - head; 2317c9e7a6fSAndy Grover } 2327c9e7a6fSAndy Grover 2337c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 2347c9e7a6fSAndy Grover 235f97ec7dbSIlias Tsitsimpis static void alloc_and_scatter_data_area(struct tcmu_dev *udev, 236f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents, 237f97ec7dbSIlias Tsitsimpis struct iovec **iov, int *iov_cnt, bool copy_data) 238f97ec7dbSIlias Tsitsimpis { 239f97ec7dbSIlias Tsitsimpis int i; 240f97ec7dbSIlias Tsitsimpis void *from, *to; 241f97ec7dbSIlias Tsitsimpis size_t copy_bytes; 242f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 243f97ec7dbSIlias Tsitsimpis 244f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 245f97ec7dbSIlias Tsitsimpis copy_bytes = min_t(size_t, sg->length, 246f97ec7dbSIlias Tsitsimpis head_to_end(udev->data_head, udev->data_size)); 247f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 248f97ec7dbSIlias Tsitsimpis to = (void *) udev->mb_addr + udev->data_off + udev->data_head; 249f97ec7dbSIlias Tsitsimpis 250f97ec7dbSIlias Tsitsimpis if (copy_data) { 251f97ec7dbSIlias Tsitsimpis memcpy(to, from, copy_bytes); 252f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 253f97ec7dbSIlias Tsitsimpis } 254f97ec7dbSIlias Tsitsimpis 255f97ec7dbSIlias Tsitsimpis /* Even iov_base is relative to mb_addr */ 256f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 257f97ec7dbSIlias Tsitsimpis (*iov)->iov_base = (void __user *) udev->data_off + 258f97ec7dbSIlias Tsitsimpis udev->data_head; 259f97ec7dbSIlias Tsitsimpis (*iov_cnt)++; 260f97ec7dbSIlias Tsitsimpis (*iov)++; 261f97ec7dbSIlias Tsitsimpis 262f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 263f97ec7dbSIlias Tsitsimpis 264f97ec7dbSIlias Tsitsimpis /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ 265f97ec7dbSIlias Tsitsimpis if (sg->length != copy_bytes) { 266e2e21bd8SSagi Grimberg void *from_skip = from + copy_bytes; 267e2e21bd8SSagi Grimberg 268f97ec7dbSIlias Tsitsimpis copy_bytes = sg->length - copy_bytes; 269f97ec7dbSIlias Tsitsimpis 270f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 271f97ec7dbSIlias Tsitsimpis (*iov)->iov_base = (void __user *) udev->data_off + 272f97ec7dbSIlias Tsitsimpis udev->data_head; 273f97ec7dbSIlias Tsitsimpis 274f97ec7dbSIlias Tsitsimpis if (copy_data) { 275f97ec7dbSIlias Tsitsimpis to = (void *) udev->mb_addr + 276f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_head; 277e2e21bd8SSagi Grimberg memcpy(to, from_skip, copy_bytes); 278f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 279f97ec7dbSIlias Tsitsimpis } 280f97ec7dbSIlias Tsitsimpis 281f97ec7dbSIlias Tsitsimpis (*iov_cnt)++; 282f97ec7dbSIlias Tsitsimpis (*iov)++; 283f97ec7dbSIlias Tsitsimpis 284f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_head, 285f97ec7dbSIlias Tsitsimpis copy_bytes, udev->data_size); 286f97ec7dbSIlias Tsitsimpis } 287f97ec7dbSIlias Tsitsimpis 288e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 289f97ec7dbSIlias Tsitsimpis } 290f97ec7dbSIlias Tsitsimpis } 291f97ec7dbSIlias Tsitsimpis 292f97ec7dbSIlias Tsitsimpis static void gather_and_free_data_area(struct tcmu_dev *udev, 293f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents) 294f97ec7dbSIlias Tsitsimpis { 295f97ec7dbSIlias Tsitsimpis int i; 296f97ec7dbSIlias Tsitsimpis void *from, *to; 297f97ec7dbSIlias Tsitsimpis size_t copy_bytes; 298f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 299f97ec7dbSIlias Tsitsimpis 300f97ec7dbSIlias Tsitsimpis /* It'd be easier to look at entry's iovec again, but UAM */ 301f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 302f97ec7dbSIlias Tsitsimpis copy_bytes = min_t(size_t, sg->length, 303f97ec7dbSIlias Tsitsimpis head_to_end(udev->data_tail, udev->data_size)); 304f97ec7dbSIlias Tsitsimpis 305f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 306f97ec7dbSIlias Tsitsimpis WARN_ON(sg->length + sg->offset > PAGE_SIZE); 307f97ec7dbSIlias Tsitsimpis from = (void *) udev->mb_addr + 308f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_tail; 309f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 310f97ec7dbSIlias Tsitsimpis memcpy(to, from, copy_bytes); 311f97ec7dbSIlias Tsitsimpis 312f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 313f97ec7dbSIlias Tsitsimpis 314f97ec7dbSIlias Tsitsimpis /* Uh oh, wrapped the data buffer for this sg's data */ 315f97ec7dbSIlias Tsitsimpis if (sg->length != copy_bytes) { 316e2e21bd8SSagi Grimberg void *to_skip = to + copy_bytes; 317e2e21bd8SSagi Grimberg 318f97ec7dbSIlias Tsitsimpis from = (void *) udev->mb_addr + 319f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_tail; 320f97ec7dbSIlias Tsitsimpis WARN_ON(udev->data_tail); 321f97ec7dbSIlias Tsitsimpis copy_bytes = sg->length - copy_bytes; 322f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 323e2e21bd8SSagi Grimberg memcpy(to_skip, from, copy_bytes); 324f97ec7dbSIlias Tsitsimpis 325f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, 326f97ec7dbSIlias Tsitsimpis copy_bytes, udev->data_size); 327f97ec7dbSIlias Tsitsimpis } 328e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 329f97ec7dbSIlias Tsitsimpis } 330f97ec7dbSIlias Tsitsimpis } 331f97ec7dbSIlias Tsitsimpis 3327c9e7a6fSAndy Grover /* 333f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 334f97ec7dbSIlias Tsitsimpis * space available on the data ring. 3357c9e7a6fSAndy Grover * 3367c9e7a6fSAndy Grover * Called with ring lock held. 3377c9e7a6fSAndy Grover */ 338f56574a2SAndy Grover static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) 3397c9e7a6fSAndy Grover { 3407c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 3417c9e7a6fSAndy Grover size_t space; 3427c9e7a6fSAndy Grover u32 cmd_head; 343f56574a2SAndy Grover size_t cmd_needed; 3447c9e7a6fSAndy Grover 3457c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 3467c9e7a6fSAndy Grover 3477c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3487c9e7a6fSAndy Grover 349f56574a2SAndy Grover /* 350f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 351f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 352f56574a2SAndy Grover */ 353f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 354f56574a2SAndy Grover cmd_needed = cmd_size; 355f56574a2SAndy Grover else 356f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 357f56574a2SAndy Grover 3587c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 3597c9e7a6fSAndy Grover if (space < cmd_needed) { 3607c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 3617c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 3627c9e7a6fSAndy Grover return false; 3637c9e7a6fSAndy Grover } 3647c9e7a6fSAndy Grover 3657c9e7a6fSAndy Grover space = spc_free(udev->data_head, udev->data_tail, udev->data_size); 3667c9e7a6fSAndy Grover if (space < data_needed) { 3677c9e7a6fSAndy Grover pr_debug("no data space: %zu %zu %zu\n", udev->data_head, 3687c9e7a6fSAndy Grover udev->data_tail, udev->data_size); 3697c9e7a6fSAndy Grover return false; 3707c9e7a6fSAndy Grover } 3717c9e7a6fSAndy Grover 3727c9e7a6fSAndy Grover return true; 3737c9e7a6fSAndy Grover } 3747c9e7a6fSAndy Grover 3757c9e7a6fSAndy Grover static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 3767c9e7a6fSAndy Grover { 3777c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 3787c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 3797c9e7a6fSAndy Grover size_t base_command_size, command_size; 3807c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 3817c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 3827c9e7a6fSAndy Grover struct iovec *iov; 383f97ec7dbSIlias Tsitsimpis int iov_cnt; 3847c9e7a6fSAndy Grover uint32_t cmd_head; 3857c9e7a6fSAndy Grover uint64_t cdb_off; 386f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 3877c9e7a6fSAndy Grover 3887c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 3897c9e7a6fSAndy Grover return -EINVAL; 3907c9e7a6fSAndy Grover 3917c9e7a6fSAndy Grover /* 3927c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 3937c9e7a6fSAndy Grover * also may be larger if the iov array is large. 3947c9e7a6fSAndy Grover * 3957c9e7a6fSAndy Grover * iovs = sgl_nents+1, for end-of-ring case, plus another 1 3967c9e7a6fSAndy Grover * b/c size == offsetof one-past-element. 3977c9e7a6fSAndy Grover */ 3987c9e7a6fSAndy Grover base_command_size = max(offsetof(struct tcmu_cmd_entry, 399e4648b01SIlias Tsitsimpis req.iov[se_cmd->t_bidi_data_nents + 400e4648b01SIlias Tsitsimpis se_cmd->t_data_nents + 2]), 4017c9e7a6fSAndy Grover sizeof(struct tcmu_cmd_entry)); 4027c9e7a6fSAndy Grover command_size = base_command_size 4037c9e7a6fSAndy Grover + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); 4047c9e7a6fSAndy Grover 4057c9e7a6fSAndy Grover WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 4067c9e7a6fSAndy Grover 4077c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4087c9e7a6fSAndy Grover 4097c9e7a6fSAndy Grover mb = udev->mb_addr; 4107c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4117c9e7a6fSAndy Grover if ((command_size > (udev->cmdr_size / 2)) 4127c9e7a6fSAndy Grover || tcmu_cmd->data_length > (udev->data_size - 1)) 4137c9e7a6fSAndy Grover pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " 4147c9e7a6fSAndy Grover "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, 4157c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 4167c9e7a6fSAndy Grover 417f56574a2SAndy Grover while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { 4187c9e7a6fSAndy Grover int ret; 4197c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 4207c9e7a6fSAndy Grover 4217c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 4227c9e7a6fSAndy Grover 4237c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 4247c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4257c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 4267c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 4277c9e7a6fSAndy Grover if (!ret) { 4287c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 4297c9e7a6fSAndy Grover return -ETIMEDOUT; 4307c9e7a6fSAndy Grover } 4317c9e7a6fSAndy Grover 4327c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4337c9e7a6fSAndy Grover 4347c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 4357c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4367c9e7a6fSAndy Grover } 4377c9e7a6fSAndy Grover 438f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 439f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 440f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 441f56574a2SAndy Grover 4427c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4437c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4440ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 4450ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 4460ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 4470ad46af8SAndy Grover entry->hdr.kflags = 0; 4480ad46af8SAndy Grover entry->hdr.uflags = 0; 4497c9e7a6fSAndy Grover 4507c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 4517c9e7a6fSAndy Grover 4527c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4537c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 4547c9e7a6fSAndy Grover } 4557c9e7a6fSAndy Grover 4567c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4577c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4580ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 4590ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 4600ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 4610ad46af8SAndy Grover entry->hdr.kflags = 0; 4620ad46af8SAndy Grover entry->hdr.uflags = 0; 4637c9e7a6fSAndy Grover 4647c9e7a6fSAndy Grover /* 4657c9e7a6fSAndy Grover * Fix up iovecs, and handle if allocation in data ring wrapped. 4667c9e7a6fSAndy Grover */ 4677c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 468f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 469e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 470e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 471f97ec7dbSIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, 472f97ec7dbSIlias Tsitsimpis se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); 4737c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 4740ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 4757c9e7a6fSAndy Grover 476e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 477e4648b01SIlias Tsitsimpis iov_cnt = 0; 478e4648b01SIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, 479e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); 480e4648b01SIlias Tsitsimpis entry->req.iov_bidi_cnt = iov_cnt; 481e4648b01SIlias Tsitsimpis 4827c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 4837c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 4847c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 4857c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 4867c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4877c9e7a6fSAndy Grover 4887c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 4897c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 4907c9e7a6fSAndy Grover 4917c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4927c9e7a6fSAndy Grover 4937c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 4947c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 4957c9e7a6fSAndy Grover 4967c9e7a6fSAndy Grover mod_timer(&udev->timeout, 4977c9e7a6fSAndy Grover round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); 4987c9e7a6fSAndy Grover 4997c9e7a6fSAndy Grover return 0; 5007c9e7a6fSAndy Grover } 5017c9e7a6fSAndy Grover 5027c9e7a6fSAndy Grover static int tcmu_queue_cmd(struct se_cmd *se_cmd) 5037c9e7a6fSAndy Grover { 5047c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5057c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5067c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5077c9e7a6fSAndy Grover int ret; 5087c9e7a6fSAndy Grover 5097c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 5107c9e7a6fSAndy Grover if (!tcmu_cmd) 5117c9e7a6fSAndy Grover return -ENOMEM; 5127c9e7a6fSAndy Grover 5137c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 5147c9e7a6fSAndy Grover if (ret < 0) { 5157c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 5167c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 5177c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 5187c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 5197c9e7a6fSAndy Grover 5207c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 5217c9e7a6fSAndy Grover } 5227c9e7a6fSAndy Grover 5237c9e7a6fSAndy Grover return ret; 5247c9e7a6fSAndy Grover } 5257c9e7a6fSAndy Grover 5267c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 5277c9e7a6fSAndy Grover { 5287c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 5297c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 5307c9e7a6fSAndy Grover 5317c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 5327c9e7a6fSAndy Grover /* cmd has been completed already from timeout, just reclaim data 5337c9e7a6fSAndy Grover ring space */ 5347c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5357c9e7a6fSAndy Grover return; 5367c9e7a6fSAndy Grover } 5377c9e7a6fSAndy Grover 5380ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 5390ad46af8SAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5400ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 5410ad46af8SAndy Grover cmd->se_cmd); 542ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 543ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 5447c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 5457c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 5467c9e7a6fSAndy Grover 5477c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 548e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 549e4648b01SIlias Tsitsimpis /* Discard data_out buffer */ 550e4648b01SIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, 551e4648b01SIlias Tsitsimpis (size_t)se_cmd->t_data_sg->length, udev->data_size); 5527c9e7a6fSAndy Grover 553e4648b01SIlias Tsitsimpis /* Get Data-In buffer */ 554e4648b01SIlias Tsitsimpis gather_and_free_data_area(udev, 555e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); 556e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 557f97ec7dbSIlias Tsitsimpis gather_and_free_data_area(udev, 558f97ec7dbSIlias Tsitsimpis se_cmd->t_data_sg, se_cmd->t_data_nents); 5597c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 5607c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5612bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 5622bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 5632bc396a2SIlias Tsitsimpis se_cmd->data_direction); 5647c9e7a6fSAndy Grover } 5657c9e7a6fSAndy Grover 5667c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 5677c9e7a6fSAndy Grover cmd->se_cmd = NULL; 5687c9e7a6fSAndy Grover 5697c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 5707c9e7a6fSAndy Grover } 5717c9e7a6fSAndy Grover 5727c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 5737c9e7a6fSAndy Grover { 5747c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 5757c9e7a6fSAndy Grover unsigned long flags; 5767c9e7a6fSAndy Grover int handled = 0; 5777c9e7a6fSAndy Grover 5787c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 5797c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 5807c9e7a6fSAndy Grover return 0; 5817c9e7a6fSAndy Grover } 5827c9e7a6fSAndy Grover 5837c9e7a6fSAndy Grover spin_lock_irqsave(&udev->cmdr_lock, flags); 5847c9e7a6fSAndy Grover 5857c9e7a6fSAndy Grover mb = udev->mb_addr; 5867c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5877c9e7a6fSAndy Grover 5887c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 5897c9e7a6fSAndy Grover 5907c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 5917c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 5927c9e7a6fSAndy Grover 5937c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 5947c9e7a6fSAndy Grover 5950ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 5960ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 5970ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 5980ad46af8SAndy Grover udev->cmdr_size); 5997c9e7a6fSAndy Grover continue; 6007c9e7a6fSAndy Grover } 6010ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 6027c9e7a6fSAndy Grover 6037c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 6040ad46af8SAndy Grover cmd = idr_find(&udev->commands, entry->hdr.cmd_id); 6057c9e7a6fSAndy Grover if (cmd) 6067c9e7a6fSAndy Grover idr_remove(&udev->commands, cmd->cmd_id); 6077c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 6087c9e7a6fSAndy Grover 6097c9e7a6fSAndy Grover if (!cmd) { 6107c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 6117c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 6127c9e7a6fSAndy Grover break; 6137c9e7a6fSAndy Grover } 6147c9e7a6fSAndy Grover 6157c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 6167c9e7a6fSAndy Grover 6170ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 6180ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 6190ad46af8SAndy Grover udev->cmdr_size); 6207c9e7a6fSAndy Grover 6217c9e7a6fSAndy Grover handled++; 6227c9e7a6fSAndy Grover } 6237c9e7a6fSAndy Grover 6247c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 6257c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 6267c9e7a6fSAndy Grover 6277c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->cmdr_lock, flags); 6287c9e7a6fSAndy Grover 6297c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 6307c9e7a6fSAndy Grover 6317c9e7a6fSAndy Grover return handled; 6327c9e7a6fSAndy Grover } 6337c9e7a6fSAndy Grover 6347c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 6357c9e7a6fSAndy Grover { 6367c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 6377c9e7a6fSAndy Grover 6387c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 6397c9e7a6fSAndy Grover return 0; 6407c9e7a6fSAndy Grover 6417c9e7a6fSAndy Grover if (!time_after(cmd->deadline, jiffies)) 6427c9e7a6fSAndy Grover return 0; 6437c9e7a6fSAndy Grover 6447c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 6457c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 6467c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6477c9e7a6fSAndy Grover 6487c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6497c9e7a6fSAndy Grover 6507c9e7a6fSAndy Grover return 0; 6517c9e7a6fSAndy Grover } 6527c9e7a6fSAndy Grover 6537c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 6547c9e7a6fSAndy Grover { 6557c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 6567c9e7a6fSAndy Grover unsigned long flags; 6577c9e7a6fSAndy Grover int handled; 6587c9e7a6fSAndy Grover 6597c9e7a6fSAndy Grover handled = tcmu_handle_completions(udev); 6607c9e7a6fSAndy Grover 6617c9e7a6fSAndy Grover pr_warn("%d completions handled from timeout\n", handled); 6627c9e7a6fSAndy Grover 6637c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 6647c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 6657c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 6667c9e7a6fSAndy Grover 6677c9e7a6fSAndy Grover /* 6687c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 6697c9e7a6fSAndy Grover * own timeout. 6707c9e7a6fSAndy Grover */ 6717c9e7a6fSAndy Grover } 6727c9e7a6fSAndy Grover 6737c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 6747c9e7a6fSAndy Grover { 6757c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 6767c9e7a6fSAndy Grover 6777c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 6787c9e7a6fSAndy Grover if (!tcmu_hba) 6797c9e7a6fSAndy Grover return -ENOMEM; 6807c9e7a6fSAndy Grover 6817c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 6827c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 6837c9e7a6fSAndy Grover 6847c9e7a6fSAndy Grover return 0; 6857c9e7a6fSAndy Grover } 6867c9e7a6fSAndy Grover 6877c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 6887c9e7a6fSAndy Grover { 6897c9e7a6fSAndy Grover kfree(hba->hba_ptr); 6907c9e7a6fSAndy Grover hba->hba_ptr = NULL; 6917c9e7a6fSAndy Grover } 6927c9e7a6fSAndy Grover 6937c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 6947c9e7a6fSAndy Grover { 6957c9e7a6fSAndy Grover struct tcmu_dev *udev; 6967c9e7a6fSAndy Grover 6977c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 6987c9e7a6fSAndy Grover if (!udev) 6997c9e7a6fSAndy Grover return NULL; 7007c9e7a6fSAndy Grover 7017c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 7027c9e7a6fSAndy Grover if (!udev->name) { 7037c9e7a6fSAndy Grover kfree(udev); 7047c9e7a6fSAndy Grover return NULL; 7057c9e7a6fSAndy Grover } 7067c9e7a6fSAndy Grover 7077c9e7a6fSAndy Grover udev->hba = hba; 7087c9e7a6fSAndy Grover 7097c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 7107c9e7a6fSAndy Grover spin_lock_init(&udev->cmdr_lock); 7117c9e7a6fSAndy Grover 7127c9e7a6fSAndy Grover idr_init(&udev->commands); 7137c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 7147c9e7a6fSAndy Grover 7157c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 7167c9e7a6fSAndy Grover (unsigned long)udev); 7177c9e7a6fSAndy Grover 7187c9e7a6fSAndy Grover return &udev->se_dev; 7197c9e7a6fSAndy Grover } 7207c9e7a6fSAndy Grover 7217c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 7227c9e7a6fSAndy Grover { 7237c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 7247c9e7a6fSAndy Grover 7257c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 7267c9e7a6fSAndy Grover 7277c9e7a6fSAndy Grover return 0; 7287c9e7a6fSAndy Grover } 7297c9e7a6fSAndy Grover 7307c9e7a6fSAndy Grover /* 7317c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 7327c9e7a6fSAndy Grover * and this stuff must come along. 7337c9e7a6fSAndy Grover */ 7347c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 7357c9e7a6fSAndy Grover { 7367c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7377c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7387c9e7a6fSAndy Grover 7397c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 7407c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 7417c9e7a6fSAndy Grover return -1; 7427c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 7437c9e7a6fSAndy Grover } 7447c9e7a6fSAndy Grover return -1; 7457c9e7a6fSAndy Grover } 7467c9e7a6fSAndy Grover 7477c9e7a6fSAndy Grover static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7487c9e7a6fSAndy Grover { 7497c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7507c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7517c9e7a6fSAndy Grover struct page *page; 7527c9e7a6fSAndy Grover unsigned long offset; 7537c9e7a6fSAndy Grover void *addr; 7547c9e7a6fSAndy Grover 7557c9e7a6fSAndy Grover int mi = tcmu_find_mem_index(vma); 7567c9e7a6fSAndy Grover if (mi < 0) 7577c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 7587c9e7a6fSAndy Grover 7597c9e7a6fSAndy Grover /* 7607c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 7617c9e7a6fSAndy Grover * to use mem[N]. 7627c9e7a6fSAndy Grover */ 7637c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 7647c9e7a6fSAndy Grover 7657c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 7667c9e7a6fSAndy Grover if (info->mem[mi].memtype == UIO_MEM_LOGICAL) 7677c9e7a6fSAndy Grover page = virt_to_page(addr); 7687c9e7a6fSAndy Grover else 7697c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 7707c9e7a6fSAndy Grover get_page(page); 7717c9e7a6fSAndy Grover vmf->page = page; 7727c9e7a6fSAndy Grover return 0; 7737c9e7a6fSAndy Grover } 7747c9e7a6fSAndy Grover 7757c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 7767c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 7777c9e7a6fSAndy Grover }; 7787c9e7a6fSAndy Grover 7797c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 7807c9e7a6fSAndy Grover { 7817c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7827c9e7a6fSAndy Grover 7837c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7847c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 7857c9e7a6fSAndy Grover 7867c9e7a6fSAndy Grover vma->vm_private_data = udev; 7877c9e7a6fSAndy Grover 7887c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 7897c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 7907c9e7a6fSAndy Grover return -EINVAL; 7917c9e7a6fSAndy Grover 7927c9e7a6fSAndy Grover return 0; 7937c9e7a6fSAndy Grover } 7947c9e7a6fSAndy Grover 7957c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 7967c9e7a6fSAndy Grover { 7977c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7987c9e7a6fSAndy Grover 7997c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 8007c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 8017c9e7a6fSAndy Grover return -EBUSY; 8027c9e7a6fSAndy Grover 8037c9e7a6fSAndy Grover pr_debug("open\n"); 8047c9e7a6fSAndy Grover 8057c9e7a6fSAndy Grover return 0; 8067c9e7a6fSAndy Grover } 8077c9e7a6fSAndy Grover 8087c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 8097c9e7a6fSAndy Grover { 8107c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8117c9e7a6fSAndy Grover 8127c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 8137c9e7a6fSAndy Grover 8147c9e7a6fSAndy Grover pr_debug("close\n"); 8157c9e7a6fSAndy Grover 8167c9e7a6fSAndy Grover return 0; 8177c9e7a6fSAndy Grover } 8187c9e7a6fSAndy Grover 8197c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 8207c9e7a6fSAndy Grover { 8217c9e7a6fSAndy Grover struct sk_buff *skb; 8227c9e7a6fSAndy Grover void *msg_header; 8236e14eab9SNicholas Bellinger int ret = -ENOMEM; 8247c9e7a6fSAndy Grover 8257c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8267c9e7a6fSAndy Grover if (!skb) 8276e14eab9SNicholas Bellinger return ret; 8287c9e7a6fSAndy Grover 8297c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 8306e14eab9SNicholas Bellinger if (!msg_header) 8316e14eab9SNicholas Bellinger goto free_skb; 8327c9e7a6fSAndy Grover 8337c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 8346e14eab9SNicholas Bellinger if (ret < 0) 8356e14eab9SNicholas Bellinger goto free_skb; 8367c9e7a6fSAndy Grover 8377c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 8386e14eab9SNicholas Bellinger if (ret < 0) 8396e14eab9SNicholas Bellinger goto free_skb; 8407c9e7a6fSAndy Grover 841053c095aSJohannes Berg genlmsg_end(skb, msg_header); 8427c9e7a6fSAndy Grover 8437c9e7a6fSAndy Grover ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, 8447c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 8457c9e7a6fSAndy Grover 8467c9e7a6fSAndy Grover /* We don't care if no one is listening */ 8477c9e7a6fSAndy Grover if (ret == -ESRCH) 8487c9e7a6fSAndy Grover ret = 0; 8497c9e7a6fSAndy Grover 8507c9e7a6fSAndy Grover return ret; 8516e14eab9SNicholas Bellinger free_skb: 8526e14eab9SNicholas Bellinger nlmsg_free(skb); 8536e14eab9SNicholas Bellinger return ret; 8547c9e7a6fSAndy Grover } 8557c9e7a6fSAndy Grover 8567c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 8577c9e7a6fSAndy Grover { 8587c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 8597c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 8607c9e7a6fSAndy Grover struct uio_info *info; 8617c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8627c9e7a6fSAndy Grover size_t size; 8637c9e7a6fSAndy Grover size_t used; 8647c9e7a6fSAndy Grover int ret = 0; 8657c9e7a6fSAndy Grover char *str; 8667c9e7a6fSAndy Grover 8677c9e7a6fSAndy Grover info = &udev->uio_info; 8687c9e7a6fSAndy Grover 8697c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 8707c9e7a6fSAndy Grover udev->dev_config); 8717c9e7a6fSAndy Grover size += 1; /* for \0 */ 8727c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 8737c9e7a6fSAndy Grover if (!str) 8747c9e7a6fSAndy Grover return -ENOMEM; 8757c9e7a6fSAndy Grover 8767c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 8777c9e7a6fSAndy Grover 8787c9e7a6fSAndy Grover if (udev->dev_config[0]) 8797c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 8807c9e7a6fSAndy Grover 8817c9e7a6fSAndy Grover info->name = str; 8827c9e7a6fSAndy Grover 8837c9e7a6fSAndy Grover udev->mb_addr = vzalloc(TCMU_RING_SIZE); 8847c9e7a6fSAndy Grover if (!udev->mb_addr) { 8857c9e7a6fSAndy Grover ret = -ENOMEM; 8867c9e7a6fSAndy Grover goto err_vzalloc; 8877c9e7a6fSAndy Grover } 8887c9e7a6fSAndy Grover 8897c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 8907c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 8917c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 8927c9e7a6fSAndy Grover udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; 8937c9e7a6fSAndy Grover 8947c9e7a6fSAndy Grover mb = udev->mb_addr; 8950ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 8967c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 8977c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 8987c9e7a6fSAndy Grover 8997c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 9007c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 9017c9e7a6fSAndy Grover 902ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 9037c9e7a6fSAndy Grover 9047c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 9057c9e7a6fSAndy Grover info->mem[0].addr = (phys_addr_t) udev->mb_addr; 9067c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 9077c9e7a6fSAndy Grover info->mem[0].memtype = UIO_MEM_VIRTUAL; 9087c9e7a6fSAndy Grover 9097c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 9107c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 9117c9e7a6fSAndy Grover 9127c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 9137c9e7a6fSAndy Grover info->open = tcmu_open; 9147c9e7a6fSAndy Grover info->release = tcmu_release; 9157c9e7a6fSAndy Grover 9167c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 9177c9e7a6fSAndy Grover if (ret) 9187c9e7a6fSAndy Grover goto err_register; 9197c9e7a6fSAndy Grover 92081ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 92181ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 9227c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 92381ee28deSSheng Yang /* Other attributes can be configured in userspace */ 9247c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 9257c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 9267c9e7a6fSAndy Grover 9277c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 9287c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9297c9e7a6fSAndy Grover if (ret) 9307c9e7a6fSAndy Grover goto err_netlink; 9317c9e7a6fSAndy Grover 9327c9e7a6fSAndy Grover return 0; 9337c9e7a6fSAndy Grover 9347c9e7a6fSAndy Grover err_netlink: 9357c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9367c9e7a6fSAndy Grover err_register: 9377c9e7a6fSAndy Grover vfree(udev->mb_addr); 9387c9e7a6fSAndy Grover err_vzalloc: 9397c9e7a6fSAndy Grover kfree(info->name); 9407c9e7a6fSAndy Grover 9417c9e7a6fSAndy Grover return ret; 9427c9e7a6fSAndy Grover } 9437c9e7a6fSAndy Grover 9447c9e7a6fSAndy Grover static int tcmu_check_pending_cmd(int id, void *p, void *data) 9457c9e7a6fSAndy Grover { 9467c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 9477c9e7a6fSAndy Grover 9487c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 9497c9e7a6fSAndy Grover return 0; 9507c9e7a6fSAndy Grover return -EINVAL; 9517c9e7a6fSAndy Grover } 9527c9e7a6fSAndy Grover 9534cc987eaSNicholas Bellinger static void tcmu_dev_call_rcu(struct rcu_head *p) 9544cc987eaSNicholas Bellinger { 9554cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 9564cc987eaSNicholas Bellinger struct tcmu_dev *udev = TCMU_DEV(dev); 9574cc987eaSNicholas Bellinger 9584cc987eaSNicholas Bellinger kfree(udev); 9594cc987eaSNicholas Bellinger } 9604cc987eaSNicholas Bellinger 9617c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 9627c9e7a6fSAndy Grover { 9637c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9647c9e7a6fSAndy Grover int i; 9657c9e7a6fSAndy Grover 9667c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 9677c9e7a6fSAndy Grover 9687c9e7a6fSAndy Grover vfree(udev->mb_addr); 9697c9e7a6fSAndy Grover 9707c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 9717c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 9727c9e7a6fSAndy Grover i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); 9737c9e7a6fSAndy Grover idr_destroy(&udev->commands); 9747c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 9757c9e7a6fSAndy Grover WARN_ON(i); 9767c9e7a6fSAndy Grover 9777c9e7a6fSAndy Grover /* Device was configured */ 9787c9e7a6fSAndy Grover if (udev->uio_info.uio_dev) { 9797c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 9807c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9817c9e7a6fSAndy Grover 9827c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9837c9e7a6fSAndy Grover kfree(udev->uio_info.name); 9847c9e7a6fSAndy Grover kfree(udev->name); 9857c9e7a6fSAndy Grover } 9864cc987eaSNicholas Bellinger call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 9877c9e7a6fSAndy Grover } 9887c9e7a6fSAndy Grover 9897c9e7a6fSAndy Grover enum { 9909c1cd1b6SAndy Grover Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, 9917c9e7a6fSAndy Grover }; 9927c9e7a6fSAndy Grover 9937c9e7a6fSAndy Grover static match_table_t tokens = { 9947c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 9957c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 9969c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 9977c9e7a6fSAndy Grover {Opt_err, NULL} 9987c9e7a6fSAndy Grover }; 9997c9e7a6fSAndy Grover 10007c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 10017c9e7a6fSAndy Grover const char *page, ssize_t count) 10027c9e7a6fSAndy Grover { 10037c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10047c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 10057c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 10067c9e7a6fSAndy Grover int ret = 0, token; 10079c1cd1b6SAndy Grover unsigned long tmp_ul; 10087c9e7a6fSAndy Grover 10097c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 10107c9e7a6fSAndy Grover if (!opts) 10117c9e7a6fSAndy Grover return -ENOMEM; 10127c9e7a6fSAndy Grover 10137c9e7a6fSAndy Grover orig = opts; 10147c9e7a6fSAndy Grover 10157c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 10167c9e7a6fSAndy Grover if (!*ptr) 10177c9e7a6fSAndy Grover continue; 10187c9e7a6fSAndy Grover 10197c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 10207c9e7a6fSAndy Grover switch (token) { 10217c9e7a6fSAndy Grover case Opt_dev_config: 10227c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 10237c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 10247c9e7a6fSAndy Grover ret = -EINVAL; 10257c9e7a6fSAndy Grover break; 10267c9e7a6fSAndy Grover } 10277c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 10287c9e7a6fSAndy Grover break; 10297c9e7a6fSAndy Grover case Opt_dev_size: 10307c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 10317c9e7a6fSAndy Grover if (!arg_p) { 10327c9e7a6fSAndy Grover ret = -ENOMEM; 10337c9e7a6fSAndy Grover break; 10347c9e7a6fSAndy Grover } 10357c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 10367c9e7a6fSAndy Grover kfree(arg_p); 10377c9e7a6fSAndy Grover if (ret < 0) 10387c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 10397c9e7a6fSAndy Grover break; 10409c1cd1b6SAndy Grover case Opt_hw_block_size: 10419c1cd1b6SAndy Grover arg_p = match_strdup(&args[0]); 10429c1cd1b6SAndy Grover if (!arg_p) { 10439c1cd1b6SAndy Grover ret = -ENOMEM; 10449c1cd1b6SAndy Grover break; 10459c1cd1b6SAndy Grover } 10469c1cd1b6SAndy Grover ret = kstrtoul(arg_p, 0, &tmp_ul); 10479c1cd1b6SAndy Grover kfree(arg_p); 10489c1cd1b6SAndy Grover if (ret < 0) { 10499c1cd1b6SAndy Grover pr_err("kstrtoul() failed for hw_block_size=\n"); 10509c1cd1b6SAndy Grover break; 10519c1cd1b6SAndy Grover } 10529c1cd1b6SAndy Grover if (!tmp_ul) { 10539c1cd1b6SAndy Grover pr_err("hw_block_size must be nonzero\n"); 10549c1cd1b6SAndy Grover break; 10559c1cd1b6SAndy Grover } 10569c1cd1b6SAndy Grover dev->dev_attrib.hw_block_size = tmp_ul; 10579c1cd1b6SAndy Grover break; 10587c9e7a6fSAndy Grover default: 10597c9e7a6fSAndy Grover break; 10607c9e7a6fSAndy Grover } 10617c9e7a6fSAndy Grover } 10627c9e7a6fSAndy Grover 10637c9e7a6fSAndy Grover kfree(orig); 10647c9e7a6fSAndy Grover return (!ret) ? count : ret; 10657c9e7a6fSAndy Grover } 10667c9e7a6fSAndy Grover 10677c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 10687c9e7a6fSAndy Grover { 10697c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10707c9e7a6fSAndy Grover ssize_t bl = 0; 10717c9e7a6fSAndy Grover 10727c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 10737c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 10748ee83a74SAndy Grover bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 10757c9e7a6fSAndy Grover 10767c9e7a6fSAndy Grover return bl; 10777c9e7a6fSAndy Grover } 10787c9e7a6fSAndy Grover 10797c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 10807c9e7a6fSAndy Grover { 10817c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10827c9e7a6fSAndy Grover 10837c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 10847c9e7a6fSAndy Grover dev->dev_attrib.block_size); 10857c9e7a6fSAndy Grover } 10867c9e7a6fSAndy Grover 10877c9e7a6fSAndy Grover static sense_reason_t 10887c9e7a6fSAndy Grover tcmu_pass_op(struct se_cmd *se_cmd) 10897c9e7a6fSAndy Grover { 10907c9e7a6fSAndy Grover int ret = tcmu_queue_cmd(se_cmd); 10917c9e7a6fSAndy Grover 10927c9e7a6fSAndy Grover if (ret != 0) 10937c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 10947c9e7a6fSAndy Grover else 10957c9e7a6fSAndy Grover return TCM_NO_SENSE; 10967c9e7a6fSAndy Grover } 10977c9e7a6fSAndy Grover 10987c9e7a6fSAndy Grover static sense_reason_t 10997c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 11007c9e7a6fSAndy Grover { 11017bfea53bSAndy Grover return passthrough_parse_cdb(cmd, tcmu_pass_op); 11029c1cd1b6SAndy Grover } 11039c1cd1b6SAndy Grover 11040a06d430SChristoph Hellwig static const struct target_backend_ops tcmu_ops = { 11057c9e7a6fSAndy Grover .name = "user", 11067c9e7a6fSAndy Grover .inquiry_prod = "USER", 11077c9e7a6fSAndy Grover .inquiry_rev = TCMU_VERSION, 11087c9e7a6fSAndy Grover .owner = THIS_MODULE, 1109a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 11107c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 11117c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 11127c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 11137c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 11147c9e7a6fSAndy Grover .free_device = tcmu_free_device, 11157c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 11167c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 11177c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 11187c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 11197c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 11205873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = passthrough_attrib_attrs, 11217c9e7a6fSAndy Grover }; 11227c9e7a6fSAndy Grover 11237c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 11247c9e7a6fSAndy Grover { 11257c9e7a6fSAndy Grover int ret; 11267c9e7a6fSAndy Grover 11277c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 11287c9e7a6fSAndy Grover 11297c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 11307c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 11317c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 11327c9e7a6fSAndy Grover 0, NULL); 11337c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 11347c9e7a6fSAndy Grover return -ENOMEM; 11357c9e7a6fSAndy Grover 11367c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 11377c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 11387c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 11397c9e7a6fSAndy Grover goto out_free_cache; 11407c9e7a6fSAndy Grover } 11417c9e7a6fSAndy Grover 11427c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 11437c9e7a6fSAndy Grover if (ret < 0) { 11447c9e7a6fSAndy Grover goto out_unreg_device; 11457c9e7a6fSAndy Grover } 11467c9e7a6fSAndy Grover 11470a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 11487c9e7a6fSAndy Grover if (ret) 11497c9e7a6fSAndy Grover goto out_unreg_genl; 11507c9e7a6fSAndy Grover 11517c9e7a6fSAndy Grover return 0; 11527c9e7a6fSAndy Grover 11537c9e7a6fSAndy Grover out_unreg_genl: 11547c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11557c9e7a6fSAndy Grover out_unreg_device: 11567c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11577c9e7a6fSAndy Grover out_free_cache: 11587c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11597c9e7a6fSAndy Grover 11607c9e7a6fSAndy Grover return ret; 11617c9e7a6fSAndy Grover } 11627c9e7a6fSAndy Grover 11637c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 11647c9e7a6fSAndy Grover { 11650a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 11667c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11677c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11687c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11697c9e7a6fSAndy Grover } 11707c9e7a6fSAndy Grover 11717c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 11727c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 11737c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 11747c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 11757c9e7a6fSAndy Grover 11767c9e7a6fSAndy Grover module_init(tcmu_module_init); 11777c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1178