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), 15520c08b36SSheng Yang .netnsok = true, 1567c9e7a6fSAndy Grover }; 1577c9e7a6fSAndy Grover 1587c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 1597c9e7a6fSAndy Grover { 1607c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 1617c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 1627c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1637c9e7a6fSAndy Grover int cmd_id; 1647c9e7a6fSAndy Grover 1657c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 1667c9e7a6fSAndy Grover if (!tcmu_cmd) 1677c9e7a6fSAndy Grover return NULL; 1687c9e7a6fSAndy Grover 1697c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 1707c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 1717c9e7a6fSAndy Grover tcmu_cmd->data_length = se_cmd->data_length; 1727c9e7a6fSAndy Grover 173e4648b01SIlias Tsitsimpis if (se_cmd->se_cmd_flags & SCF_BIDI) { 174e4648b01SIlias Tsitsimpis BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 175e4648b01SIlias Tsitsimpis tcmu_cmd->data_length += se_cmd->t_bidi_data_sg->length; 176e4648b01SIlias Tsitsimpis } 177e4648b01SIlias Tsitsimpis 1787c9e7a6fSAndy Grover tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); 1797c9e7a6fSAndy Grover 1807c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 1817c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1827c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 1837c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 1847c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1857c9e7a6fSAndy Grover idr_preload_end(); 1867c9e7a6fSAndy Grover 1877c9e7a6fSAndy Grover if (cmd_id < 0) { 1887c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 1897c9e7a6fSAndy Grover return NULL; 1907c9e7a6fSAndy Grover } 1917c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 1927c9e7a6fSAndy Grover 1937c9e7a6fSAndy Grover return tcmu_cmd; 1947c9e7a6fSAndy Grover } 1957c9e7a6fSAndy Grover 1967c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 1977c9e7a6fSAndy Grover { 198b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 1997c9e7a6fSAndy Grover 2007c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 2017c9e7a6fSAndy Grover vaddr -= offset; 2027c9e7a6fSAndy Grover 2037c9e7a6fSAndy Grover while (size) { 2047c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 2057c9e7a6fSAndy Grover size -= PAGE_SIZE; 2067c9e7a6fSAndy Grover } 2077c9e7a6fSAndy Grover } 2087c9e7a6fSAndy Grover 2097c9e7a6fSAndy Grover /* 2107c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 2117c9e7a6fSAndy Grover * we can't use circ_buf.h. 2127c9e7a6fSAndy Grover */ 2137c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 2147c9e7a6fSAndy Grover { 2157c9e7a6fSAndy Grover int diff = head - tail; 2167c9e7a6fSAndy Grover 2177c9e7a6fSAndy Grover if (diff >= 0) 2187c9e7a6fSAndy Grover return diff; 2197c9e7a6fSAndy Grover else 2207c9e7a6fSAndy Grover return size + diff; 2217c9e7a6fSAndy Grover } 2227c9e7a6fSAndy Grover 2237c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 2247c9e7a6fSAndy Grover { 2257c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 2267c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 2277c9e7a6fSAndy Grover } 2287c9e7a6fSAndy Grover 2297c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 2307c9e7a6fSAndy Grover { 2317c9e7a6fSAndy Grover return size - head; 2327c9e7a6fSAndy Grover } 2337c9e7a6fSAndy Grover 234f1dbd087SSheng Yang static inline void new_iov(struct iovec **iov, int *iov_cnt, 235f1dbd087SSheng Yang struct tcmu_dev *udev) 236f1dbd087SSheng Yang { 237f1dbd087SSheng Yang struct iovec *iovec; 238f1dbd087SSheng Yang 239f1dbd087SSheng Yang if (*iov_cnt != 0) 240f1dbd087SSheng Yang (*iov)++; 241f1dbd087SSheng Yang (*iov_cnt)++; 242f1dbd087SSheng Yang 243f1dbd087SSheng Yang iovec = *iov; 244f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 245f1dbd087SSheng Yang 246f1dbd087SSheng Yang /* Even iov_base is relative to mb_addr */ 247f1dbd087SSheng Yang iovec->iov_base = (void __user *) udev->data_off + 248f1dbd087SSheng Yang udev->data_head; 249f1dbd087SSheng Yang } 250f1dbd087SSheng Yang 2517c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 2527c9e7a6fSAndy Grover 253f97ec7dbSIlias Tsitsimpis static void alloc_and_scatter_data_area(struct tcmu_dev *udev, 254f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents, 255f97ec7dbSIlias Tsitsimpis struct iovec **iov, int *iov_cnt, bool copy_data) 256f97ec7dbSIlias Tsitsimpis { 257f97ec7dbSIlias Tsitsimpis int i; 258f97ec7dbSIlias Tsitsimpis void *from, *to; 259f97ec7dbSIlias Tsitsimpis size_t copy_bytes; 260f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 261f97ec7dbSIlias Tsitsimpis 262f1dbd087SSheng Yang if (data_nents == 0) 263f1dbd087SSheng Yang return; 264f1dbd087SSheng Yang 265f1dbd087SSheng Yang new_iov(iov, iov_cnt, udev); 266f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 267f97ec7dbSIlias Tsitsimpis copy_bytes = min_t(size_t, sg->length, 268f97ec7dbSIlias Tsitsimpis head_to_end(udev->data_head, udev->data_size)); 269f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 270f97ec7dbSIlias Tsitsimpis to = (void *) udev->mb_addr + udev->data_off + udev->data_head; 271f97ec7dbSIlias Tsitsimpis 272f97ec7dbSIlias Tsitsimpis if (copy_data) { 273f97ec7dbSIlias Tsitsimpis memcpy(to, from, copy_bytes); 274f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 275f97ec7dbSIlias Tsitsimpis } 276f97ec7dbSIlias Tsitsimpis 277f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 278f97ec7dbSIlias Tsitsimpis 279f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); 280f97ec7dbSIlias Tsitsimpis 281f97ec7dbSIlias Tsitsimpis /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ 282f97ec7dbSIlias Tsitsimpis if (sg->length != copy_bytes) { 283e2e21bd8SSagi Grimberg void *from_skip = from + copy_bytes; 284e2e21bd8SSagi Grimberg 285f97ec7dbSIlias Tsitsimpis copy_bytes = sg->length - copy_bytes; 286f97ec7dbSIlias Tsitsimpis 287f1dbd087SSheng Yang new_iov(iov, iov_cnt, udev); 288f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 289f97ec7dbSIlias Tsitsimpis 290f97ec7dbSIlias Tsitsimpis if (copy_data) { 291f97ec7dbSIlias Tsitsimpis to = (void *) udev->mb_addr + 292f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_head; 293e2e21bd8SSagi Grimberg memcpy(to, from_skip, copy_bytes); 294f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 295f97ec7dbSIlias Tsitsimpis } 296f97ec7dbSIlias Tsitsimpis 297f97ec7dbSIlias Tsitsimpis 298f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_head, 299f97ec7dbSIlias Tsitsimpis copy_bytes, udev->data_size); 300f97ec7dbSIlias Tsitsimpis } 301f97ec7dbSIlias Tsitsimpis 302e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 303f97ec7dbSIlias Tsitsimpis } 304f97ec7dbSIlias Tsitsimpis } 305f97ec7dbSIlias Tsitsimpis 306f97ec7dbSIlias Tsitsimpis static void gather_and_free_data_area(struct tcmu_dev *udev, 307f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents) 308f97ec7dbSIlias Tsitsimpis { 309f97ec7dbSIlias Tsitsimpis int i; 310f97ec7dbSIlias Tsitsimpis void *from, *to; 311f97ec7dbSIlias Tsitsimpis size_t copy_bytes; 312f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 313f97ec7dbSIlias Tsitsimpis 314f97ec7dbSIlias Tsitsimpis /* It'd be easier to look at entry's iovec again, but UAM */ 315f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 316f97ec7dbSIlias Tsitsimpis copy_bytes = min_t(size_t, sg->length, 317f97ec7dbSIlias Tsitsimpis head_to_end(udev->data_tail, udev->data_size)); 318f97ec7dbSIlias Tsitsimpis 319f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 320f97ec7dbSIlias Tsitsimpis WARN_ON(sg->length + sg->offset > PAGE_SIZE); 321f97ec7dbSIlias Tsitsimpis from = (void *) udev->mb_addr + 322f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_tail; 323f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 324f97ec7dbSIlias Tsitsimpis memcpy(to, from, copy_bytes); 325f97ec7dbSIlias Tsitsimpis 326f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); 327f97ec7dbSIlias Tsitsimpis 328f97ec7dbSIlias Tsitsimpis /* Uh oh, wrapped the data buffer for this sg's data */ 329f97ec7dbSIlias Tsitsimpis if (sg->length != copy_bytes) { 330e2e21bd8SSagi Grimberg void *to_skip = to + copy_bytes; 331e2e21bd8SSagi Grimberg 332f97ec7dbSIlias Tsitsimpis from = (void *) udev->mb_addr + 333f97ec7dbSIlias Tsitsimpis udev->data_off + udev->data_tail; 334f97ec7dbSIlias Tsitsimpis WARN_ON(udev->data_tail); 335f97ec7dbSIlias Tsitsimpis copy_bytes = sg->length - copy_bytes; 336f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 337e2e21bd8SSagi Grimberg memcpy(to_skip, from, copy_bytes); 338f97ec7dbSIlias Tsitsimpis 339f97ec7dbSIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, 340f97ec7dbSIlias Tsitsimpis copy_bytes, udev->data_size); 341f97ec7dbSIlias Tsitsimpis } 342e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 343f97ec7dbSIlias Tsitsimpis } 344f97ec7dbSIlias Tsitsimpis } 345f97ec7dbSIlias Tsitsimpis 3467c9e7a6fSAndy Grover /* 347f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 348f97ec7dbSIlias Tsitsimpis * space available on the data ring. 3497c9e7a6fSAndy Grover * 3507c9e7a6fSAndy Grover * Called with ring lock held. 3517c9e7a6fSAndy Grover */ 352f56574a2SAndy Grover static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) 3537c9e7a6fSAndy Grover { 3547c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 3557c9e7a6fSAndy Grover size_t space; 3567c9e7a6fSAndy Grover u32 cmd_head; 357f56574a2SAndy Grover size_t cmd_needed; 3587c9e7a6fSAndy Grover 3597c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 3607c9e7a6fSAndy Grover 3617c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3627c9e7a6fSAndy Grover 363f56574a2SAndy Grover /* 364f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 365f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 366f56574a2SAndy Grover */ 367f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 368f56574a2SAndy Grover cmd_needed = cmd_size; 369f56574a2SAndy Grover else 370f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 371f56574a2SAndy Grover 3727c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 3737c9e7a6fSAndy Grover if (space < cmd_needed) { 3747c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 3757c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 3767c9e7a6fSAndy Grover return false; 3777c9e7a6fSAndy Grover } 3787c9e7a6fSAndy Grover 3797c9e7a6fSAndy Grover space = spc_free(udev->data_head, udev->data_tail, udev->data_size); 3807c9e7a6fSAndy Grover if (space < data_needed) { 3817c9e7a6fSAndy Grover pr_debug("no data space: %zu %zu %zu\n", udev->data_head, 3827c9e7a6fSAndy Grover udev->data_tail, udev->data_size); 3837c9e7a6fSAndy Grover return false; 3847c9e7a6fSAndy Grover } 3857c9e7a6fSAndy Grover 3867c9e7a6fSAndy Grover return true; 3877c9e7a6fSAndy Grover } 3887c9e7a6fSAndy Grover 3897c9e7a6fSAndy Grover static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 3907c9e7a6fSAndy Grover { 3917c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 3927c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 3937c9e7a6fSAndy Grover size_t base_command_size, command_size; 3947c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 3957c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 3967c9e7a6fSAndy Grover struct iovec *iov; 397f97ec7dbSIlias Tsitsimpis int iov_cnt; 3987c9e7a6fSAndy Grover uint32_t cmd_head; 3997c9e7a6fSAndy Grover uint64_t cdb_off; 400f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 4017c9e7a6fSAndy Grover 4027c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 4037c9e7a6fSAndy Grover return -EINVAL; 4047c9e7a6fSAndy Grover 4057c9e7a6fSAndy Grover /* 4067c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 4077c9e7a6fSAndy Grover * also may be larger if the iov array is large. 4087c9e7a6fSAndy Grover * 409f1dbd087SSheng Yang * 3 iovs since we can describe the whole continuous are using one 410f1dbd087SSheng Yang * for data, one for bidi and one more in the case of wrap. 4117c9e7a6fSAndy Grover */ 412f1dbd087SSheng Yang base_command_size = max(offsetof(struct tcmu_cmd_entry, req.iov[3]), 4137c9e7a6fSAndy Grover sizeof(struct tcmu_cmd_entry)); 4147c9e7a6fSAndy Grover command_size = base_command_size 4157c9e7a6fSAndy Grover + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); 4167c9e7a6fSAndy Grover 4177c9e7a6fSAndy Grover WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 4187c9e7a6fSAndy Grover 4197c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4207c9e7a6fSAndy Grover 4217c9e7a6fSAndy Grover mb = udev->mb_addr; 4227c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4237c9e7a6fSAndy Grover if ((command_size > (udev->cmdr_size / 2)) 4247c9e7a6fSAndy Grover || tcmu_cmd->data_length > (udev->data_size - 1)) 4257c9e7a6fSAndy Grover pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " 4267c9e7a6fSAndy Grover "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, 4277c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 4287c9e7a6fSAndy Grover 429f56574a2SAndy Grover while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { 4307c9e7a6fSAndy Grover int ret; 4317c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 4327c9e7a6fSAndy Grover 4337c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 4347c9e7a6fSAndy Grover 4357c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 4367c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4377c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 4387c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 4397c9e7a6fSAndy Grover if (!ret) { 4407c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 4417c9e7a6fSAndy Grover return -ETIMEDOUT; 4427c9e7a6fSAndy Grover } 4437c9e7a6fSAndy Grover 4447c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4457c9e7a6fSAndy Grover 4467c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 4477c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4487c9e7a6fSAndy Grover } 4497c9e7a6fSAndy Grover 450f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 451f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 452f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 453f56574a2SAndy Grover 4547c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4557c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4560ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 4570ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 4580ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 4590ad46af8SAndy Grover entry->hdr.kflags = 0; 4600ad46af8SAndy Grover entry->hdr.uflags = 0; 4617c9e7a6fSAndy Grover 4627c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 4637c9e7a6fSAndy Grover 4647c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4657c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 4667c9e7a6fSAndy Grover } 4677c9e7a6fSAndy Grover 4687c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4697c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4700ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 4710ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 4720ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 4730ad46af8SAndy Grover entry->hdr.kflags = 0; 4740ad46af8SAndy Grover entry->hdr.uflags = 0; 4757c9e7a6fSAndy Grover 4767c9e7a6fSAndy Grover /* 4777c9e7a6fSAndy Grover * Fix up iovecs, and handle if allocation in data ring wrapped. 4787c9e7a6fSAndy Grover */ 4797c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 480f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 481e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 482e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 483f97ec7dbSIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, 484f97ec7dbSIlias Tsitsimpis se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); 4857c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 4860ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 4877c9e7a6fSAndy Grover 488e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 489e4648b01SIlias Tsitsimpis iov_cnt = 0; 490e4648b01SIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, 491e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); 492e4648b01SIlias Tsitsimpis entry->req.iov_bidi_cnt = iov_cnt; 493e4648b01SIlias Tsitsimpis 4947c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 4957c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 4967c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 4977c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 4987c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4997c9e7a6fSAndy Grover 5007c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 5017c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5027c9e7a6fSAndy Grover 5037c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 5047c9e7a6fSAndy Grover 5057c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 5067c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 5077c9e7a6fSAndy Grover 5087c9e7a6fSAndy Grover mod_timer(&udev->timeout, 5097c9e7a6fSAndy Grover round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); 5107c9e7a6fSAndy Grover 5117c9e7a6fSAndy Grover return 0; 5127c9e7a6fSAndy Grover } 5137c9e7a6fSAndy Grover 5147c9e7a6fSAndy Grover static int tcmu_queue_cmd(struct se_cmd *se_cmd) 5157c9e7a6fSAndy Grover { 5167c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5177c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5187c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5197c9e7a6fSAndy Grover int ret; 5207c9e7a6fSAndy Grover 5217c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 5227c9e7a6fSAndy Grover if (!tcmu_cmd) 5237c9e7a6fSAndy Grover return -ENOMEM; 5247c9e7a6fSAndy Grover 5257c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 5267c9e7a6fSAndy Grover if (ret < 0) { 5277c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 5287c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 5297c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 5307c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 5317c9e7a6fSAndy Grover 5327c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 5337c9e7a6fSAndy Grover } 5347c9e7a6fSAndy Grover 5357c9e7a6fSAndy Grover return ret; 5367c9e7a6fSAndy Grover } 5377c9e7a6fSAndy Grover 5387c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 5397c9e7a6fSAndy Grover { 5407c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 5417c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 5427c9e7a6fSAndy Grover 5437c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 5447c9e7a6fSAndy Grover /* cmd has been completed already from timeout, just reclaim data 5457c9e7a6fSAndy Grover ring space */ 5467c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5477c9e7a6fSAndy Grover return; 5487c9e7a6fSAndy Grover } 5497c9e7a6fSAndy Grover 5500ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 5510ad46af8SAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5520ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 5530ad46af8SAndy Grover cmd->se_cmd); 554ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 555ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 5567c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 5577c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 5587c9e7a6fSAndy Grover 5597c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 560e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 561e4648b01SIlias Tsitsimpis /* Discard data_out buffer */ 562e4648b01SIlias Tsitsimpis UPDATE_HEAD(udev->data_tail, 563e4648b01SIlias Tsitsimpis (size_t)se_cmd->t_data_sg->length, udev->data_size); 5647c9e7a6fSAndy Grover 565e4648b01SIlias Tsitsimpis /* Get Data-In buffer */ 566e4648b01SIlias Tsitsimpis gather_and_free_data_area(udev, 567e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); 568e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 569f97ec7dbSIlias Tsitsimpis gather_and_free_data_area(udev, 570f97ec7dbSIlias Tsitsimpis se_cmd->t_data_sg, se_cmd->t_data_nents); 5717c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 5727c9e7a6fSAndy Grover UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); 5732bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 5742bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 5752bc396a2SIlias Tsitsimpis se_cmd->data_direction); 5767c9e7a6fSAndy Grover } 5777c9e7a6fSAndy Grover 5787c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 5797c9e7a6fSAndy Grover cmd->se_cmd = NULL; 5807c9e7a6fSAndy Grover 5817c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 5827c9e7a6fSAndy Grover } 5837c9e7a6fSAndy Grover 5847c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 5857c9e7a6fSAndy Grover { 5867c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 5877c9e7a6fSAndy Grover unsigned long flags; 5887c9e7a6fSAndy Grover int handled = 0; 5897c9e7a6fSAndy Grover 5907c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 5917c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 5927c9e7a6fSAndy Grover return 0; 5937c9e7a6fSAndy Grover } 5947c9e7a6fSAndy Grover 5957c9e7a6fSAndy Grover spin_lock_irqsave(&udev->cmdr_lock, flags); 5967c9e7a6fSAndy Grover 5977c9e7a6fSAndy Grover mb = udev->mb_addr; 5987c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5997c9e7a6fSAndy Grover 6007c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 6017c9e7a6fSAndy Grover 6027c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 6037c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 6047c9e7a6fSAndy Grover 6057c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 6067c9e7a6fSAndy Grover 6070ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 6080ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 6090ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 6100ad46af8SAndy Grover udev->cmdr_size); 6117c9e7a6fSAndy Grover continue; 6127c9e7a6fSAndy Grover } 6130ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 6147c9e7a6fSAndy Grover 6157c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 6160ad46af8SAndy Grover cmd = idr_find(&udev->commands, entry->hdr.cmd_id); 6177c9e7a6fSAndy Grover if (cmd) 6187c9e7a6fSAndy Grover idr_remove(&udev->commands, cmd->cmd_id); 6197c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 6207c9e7a6fSAndy Grover 6217c9e7a6fSAndy Grover if (!cmd) { 6227c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 6237c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 6247c9e7a6fSAndy Grover break; 6257c9e7a6fSAndy Grover } 6267c9e7a6fSAndy Grover 6277c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 6287c9e7a6fSAndy Grover 6290ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 6300ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 6310ad46af8SAndy Grover udev->cmdr_size); 6327c9e7a6fSAndy Grover 6337c9e7a6fSAndy Grover handled++; 6347c9e7a6fSAndy Grover } 6357c9e7a6fSAndy Grover 6367c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 6377c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 6387c9e7a6fSAndy Grover 6397c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->cmdr_lock, flags); 6407c9e7a6fSAndy Grover 6417c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 6427c9e7a6fSAndy Grover 6437c9e7a6fSAndy Grover return handled; 6447c9e7a6fSAndy Grover } 6457c9e7a6fSAndy Grover 6467c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 6477c9e7a6fSAndy Grover { 6487c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 6497c9e7a6fSAndy Grover 6507c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 6517c9e7a6fSAndy Grover return 0; 6527c9e7a6fSAndy Grover 653611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 6547c9e7a6fSAndy Grover return 0; 6557c9e7a6fSAndy Grover 6567c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 6577c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 6587c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6597c9e7a6fSAndy Grover 6607c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6617c9e7a6fSAndy Grover 6627c9e7a6fSAndy Grover return 0; 6637c9e7a6fSAndy Grover } 6647c9e7a6fSAndy Grover 6657c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 6667c9e7a6fSAndy Grover { 6677c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 6687c9e7a6fSAndy Grover unsigned long flags; 6697c9e7a6fSAndy Grover int handled; 6707c9e7a6fSAndy Grover 6717c9e7a6fSAndy Grover handled = tcmu_handle_completions(udev); 6727c9e7a6fSAndy Grover 6737c9e7a6fSAndy Grover pr_warn("%d completions handled from timeout\n", handled); 6747c9e7a6fSAndy Grover 6757c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 6767c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 6777c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 6787c9e7a6fSAndy Grover 6797c9e7a6fSAndy Grover /* 6807c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 6817c9e7a6fSAndy Grover * own timeout. 6827c9e7a6fSAndy Grover */ 6837c9e7a6fSAndy Grover } 6847c9e7a6fSAndy Grover 6857c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 6867c9e7a6fSAndy Grover { 6877c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 6887c9e7a6fSAndy Grover 6897c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 6907c9e7a6fSAndy Grover if (!tcmu_hba) 6917c9e7a6fSAndy Grover return -ENOMEM; 6927c9e7a6fSAndy Grover 6937c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 6947c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 6957c9e7a6fSAndy Grover 6967c9e7a6fSAndy Grover return 0; 6977c9e7a6fSAndy Grover } 6987c9e7a6fSAndy Grover 6997c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 7007c9e7a6fSAndy Grover { 7017c9e7a6fSAndy Grover kfree(hba->hba_ptr); 7027c9e7a6fSAndy Grover hba->hba_ptr = NULL; 7037c9e7a6fSAndy Grover } 7047c9e7a6fSAndy Grover 7057c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 7067c9e7a6fSAndy Grover { 7077c9e7a6fSAndy Grover struct tcmu_dev *udev; 7087c9e7a6fSAndy Grover 7097c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 7107c9e7a6fSAndy Grover if (!udev) 7117c9e7a6fSAndy Grover return NULL; 7127c9e7a6fSAndy Grover 7137c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 7147c9e7a6fSAndy Grover if (!udev->name) { 7157c9e7a6fSAndy Grover kfree(udev); 7167c9e7a6fSAndy Grover return NULL; 7177c9e7a6fSAndy Grover } 7187c9e7a6fSAndy Grover 7197c9e7a6fSAndy Grover udev->hba = hba; 7207c9e7a6fSAndy Grover 7217c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 7227c9e7a6fSAndy Grover spin_lock_init(&udev->cmdr_lock); 7237c9e7a6fSAndy Grover 7247c9e7a6fSAndy Grover idr_init(&udev->commands); 7257c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 7267c9e7a6fSAndy Grover 7277c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 7287c9e7a6fSAndy Grover (unsigned long)udev); 7297c9e7a6fSAndy Grover 7307c9e7a6fSAndy Grover return &udev->se_dev; 7317c9e7a6fSAndy Grover } 7327c9e7a6fSAndy Grover 7337c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 7347c9e7a6fSAndy Grover { 7357c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 7367c9e7a6fSAndy Grover 7377c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 7387c9e7a6fSAndy Grover 7397c9e7a6fSAndy Grover return 0; 7407c9e7a6fSAndy Grover } 7417c9e7a6fSAndy Grover 7427c9e7a6fSAndy Grover /* 7437c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 7447c9e7a6fSAndy Grover * and this stuff must come along. 7457c9e7a6fSAndy Grover */ 7467c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 7477c9e7a6fSAndy Grover { 7487c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7497c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7507c9e7a6fSAndy Grover 7517c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 7527c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 7537c9e7a6fSAndy Grover return -1; 7547c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 7557c9e7a6fSAndy Grover } 7567c9e7a6fSAndy Grover return -1; 7577c9e7a6fSAndy Grover } 7587c9e7a6fSAndy Grover 7597c9e7a6fSAndy Grover static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7607c9e7a6fSAndy Grover { 7617c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7627c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7637c9e7a6fSAndy Grover struct page *page; 7647c9e7a6fSAndy Grover unsigned long offset; 7657c9e7a6fSAndy Grover void *addr; 7667c9e7a6fSAndy Grover 7677c9e7a6fSAndy Grover int mi = tcmu_find_mem_index(vma); 7687c9e7a6fSAndy Grover if (mi < 0) 7697c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 7707c9e7a6fSAndy Grover 7717c9e7a6fSAndy Grover /* 7727c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 7737c9e7a6fSAndy Grover * to use mem[N]. 7747c9e7a6fSAndy Grover */ 7757c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 7767c9e7a6fSAndy Grover 7777c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 7787c9e7a6fSAndy Grover if (info->mem[mi].memtype == UIO_MEM_LOGICAL) 7797c9e7a6fSAndy Grover page = virt_to_page(addr); 7807c9e7a6fSAndy Grover else 7817c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 7827c9e7a6fSAndy Grover get_page(page); 7837c9e7a6fSAndy Grover vmf->page = page; 7847c9e7a6fSAndy Grover return 0; 7857c9e7a6fSAndy Grover } 7867c9e7a6fSAndy Grover 7877c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 7887c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 7897c9e7a6fSAndy Grover }; 7907c9e7a6fSAndy Grover 7917c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 7927c9e7a6fSAndy Grover { 7937c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 7947c9e7a6fSAndy Grover 7957c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7967c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 7977c9e7a6fSAndy Grover 7987c9e7a6fSAndy Grover vma->vm_private_data = udev; 7997c9e7a6fSAndy Grover 8007c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 8017c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 8027c9e7a6fSAndy Grover return -EINVAL; 8037c9e7a6fSAndy Grover 8047c9e7a6fSAndy Grover return 0; 8057c9e7a6fSAndy Grover } 8067c9e7a6fSAndy Grover 8077c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 8087c9e7a6fSAndy Grover { 8097c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8107c9e7a6fSAndy Grover 8117c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 8127c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 8137c9e7a6fSAndy Grover return -EBUSY; 8147c9e7a6fSAndy Grover 8157c9e7a6fSAndy Grover pr_debug("open\n"); 8167c9e7a6fSAndy Grover 8177c9e7a6fSAndy Grover return 0; 8187c9e7a6fSAndy Grover } 8197c9e7a6fSAndy Grover 8207c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 8217c9e7a6fSAndy Grover { 8227c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8237c9e7a6fSAndy Grover 8247c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 8257c9e7a6fSAndy Grover 8267c9e7a6fSAndy Grover pr_debug("close\n"); 8277c9e7a6fSAndy Grover 8287c9e7a6fSAndy Grover return 0; 8297c9e7a6fSAndy Grover } 8307c9e7a6fSAndy Grover 8317c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 8327c9e7a6fSAndy Grover { 8337c9e7a6fSAndy Grover struct sk_buff *skb; 8347c9e7a6fSAndy Grover void *msg_header; 8356e14eab9SNicholas Bellinger int ret = -ENOMEM; 8367c9e7a6fSAndy Grover 8377c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8387c9e7a6fSAndy Grover if (!skb) 8396e14eab9SNicholas Bellinger return ret; 8407c9e7a6fSAndy Grover 8417c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 8426e14eab9SNicholas Bellinger if (!msg_header) 8436e14eab9SNicholas Bellinger goto free_skb; 8447c9e7a6fSAndy Grover 8457c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 8466e14eab9SNicholas Bellinger if (ret < 0) 8476e14eab9SNicholas Bellinger goto free_skb; 8487c9e7a6fSAndy Grover 8497c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 8506e14eab9SNicholas Bellinger if (ret < 0) 8516e14eab9SNicholas Bellinger goto free_skb; 8527c9e7a6fSAndy Grover 853053c095aSJohannes Berg genlmsg_end(skb, msg_header); 8547c9e7a6fSAndy Grover 85520c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 8567c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 8577c9e7a6fSAndy Grover 8587c9e7a6fSAndy Grover /* We don't care if no one is listening */ 8597c9e7a6fSAndy Grover if (ret == -ESRCH) 8607c9e7a6fSAndy Grover ret = 0; 8617c9e7a6fSAndy Grover 8627c9e7a6fSAndy Grover return ret; 8636e14eab9SNicholas Bellinger free_skb: 8646e14eab9SNicholas Bellinger nlmsg_free(skb); 8656e14eab9SNicholas Bellinger return ret; 8667c9e7a6fSAndy Grover } 8677c9e7a6fSAndy Grover 8687c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 8697c9e7a6fSAndy Grover { 8707c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 8717c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 8727c9e7a6fSAndy Grover struct uio_info *info; 8737c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8747c9e7a6fSAndy Grover size_t size; 8757c9e7a6fSAndy Grover size_t used; 8767c9e7a6fSAndy Grover int ret = 0; 8777c9e7a6fSAndy Grover char *str; 8787c9e7a6fSAndy Grover 8797c9e7a6fSAndy Grover info = &udev->uio_info; 8807c9e7a6fSAndy Grover 8817c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 8827c9e7a6fSAndy Grover udev->dev_config); 8837c9e7a6fSAndy Grover size += 1; /* for \0 */ 8847c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 8857c9e7a6fSAndy Grover if (!str) 8867c9e7a6fSAndy Grover return -ENOMEM; 8877c9e7a6fSAndy Grover 8887c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 8897c9e7a6fSAndy Grover 8907c9e7a6fSAndy Grover if (udev->dev_config[0]) 8917c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 8927c9e7a6fSAndy Grover 8937c9e7a6fSAndy Grover info->name = str; 8947c9e7a6fSAndy Grover 8957c9e7a6fSAndy Grover udev->mb_addr = vzalloc(TCMU_RING_SIZE); 8967c9e7a6fSAndy Grover if (!udev->mb_addr) { 8977c9e7a6fSAndy Grover ret = -ENOMEM; 8987c9e7a6fSAndy Grover goto err_vzalloc; 8997c9e7a6fSAndy Grover } 9007c9e7a6fSAndy Grover 9017c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 9027c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 9037c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 9047c9e7a6fSAndy Grover udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; 9057c9e7a6fSAndy Grover 9067c9e7a6fSAndy Grover mb = udev->mb_addr; 9070ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 9087c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 9097c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 9107c9e7a6fSAndy Grover 9117c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 9127c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 9137c9e7a6fSAndy Grover 914ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 9157c9e7a6fSAndy Grover 9167c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 9170633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 9187c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 9197c9e7a6fSAndy Grover info->mem[0].memtype = UIO_MEM_VIRTUAL; 9207c9e7a6fSAndy Grover 9217c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 9227c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 9237c9e7a6fSAndy Grover 9247c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 9257c9e7a6fSAndy Grover info->open = tcmu_open; 9267c9e7a6fSAndy Grover info->release = tcmu_release; 9277c9e7a6fSAndy Grover 9287c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 9297c9e7a6fSAndy Grover if (ret) 9307c9e7a6fSAndy Grover goto err_register; 9317c9e7a6fSAndy Grover 93281ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 93381ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 9347c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 93581ee28deSSheng Yang /* Other attributes can be configured in userspace */ 9367c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 9377c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 9387c9e7a6fSAndy Grover 9397c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 9407c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9417c9e7a6fSAndy Grover if (ret) 9427c9e7a6fSAndy Grover goto err_netlink; 9437c9e7a6fSAndy Grover 9447c9e7a6fSAndy Grover return 0; 9457c9e7a6fSAndy Grover 9467c9e7a6fSAndy Grover err_netlink: 9477c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9487c9e7a6fSAndy Grover err_register: 9497c9e7a6fSAndy Grover vfree(udev->mb_addr); 9507c9e7a6fSAndy Grover err_vzalloc: 9517c9e7a6fSAndy Grover kfree(info->name); 9527c9e7a6fSAndy Grover 9537c9e7a6fSAndy Grover return ret; 9547c9e7a6fSAndy Grover } 9557c9e7a6fSAndy Grover 9567c9e7a6fSAndy Grover static int tcmu_check_pending_cmd(int id, void *p, void *data) 9577c9e7a6fSAndy Grover { 9587c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 9597c9e7a6fSAndy Grover 9607c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 9617c9e7a6fSAndy Grover return 0; 9627c9e7a6fSAndy Grover return -EINVAL; 9637c9e7a6fSAndy Grover } 9647c9e7a6fSAndy Grover 9654cc987eaSNicholas Bellinger static void tcmu_dev_call_rcu(struct rcu_head *p) 9664cc987eaSNicholas Bellinger { 9674cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 9684cc987eaSNicholas Bellinger struct tcmu_dev *udev = TCMU_DEV(dev); 9694cc987eaSNicholas Bellinger 9704cc987eaSNicholas Bellinger kfree(udev); 9714cc987eaSNicholas Bellinger } 9724cc987eaSNicholas Bellinger 9737c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 9747c9e7a6fSAndy Grover { 9757c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 9767c9e7a6fSAndy Grover int i; 9777c9e7a6fSAndy Grover 9787c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 9797c9e7a6fSAndy Grover 9807c9e7a6fSAndy Grover vfree(udev->mb_addr); 9817c9e7a6fSAndy Grover 9827c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 9837c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 9847c9e7a6fSAndy Grover i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); 9857c9e7a6fSAndy Grover idr_destroy(&udev->commands); 9867c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 9877c9e7a6fSAndy Grover WARN_ON(i); 9887c9e7a6fSAndy Grover 9897c9e7a6fSAndy Grover /* Device was configured */ 9907c9e7a6fSAndy Grover if (udev->uio_info.uio_dev) { 9917c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 9927c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9937c9e7a6fSAndy Grover 9947c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9957c9e7a6fSAndy Grover kfree(udev->uio_info.name); 9967c9e7a6fSAndy Grover kfree(udev->name); 9977c9e7a6fSAndy Grover } 9984cc987eaSNicholas Bellinger call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 9997c9e7a6fSAndy Grover } 10007c9e7a6fSAndy Grover 10017c9e7a6fSAndy Grover enum { 10029c1cd1b6SAndy Grover Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, 10037c9e7a6fSAndy Grover }; 10047c9e7a6fSAndy Grover 10057c9e7a6fSAndy Grover static match_table_t tokens = { 10067c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 10077c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 10089c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 10097c9e7a6fSAndy Grover {Opt_err, NULL} 10107c9e7a6fSAndy Grover }; 10117c9e7a6fSAndy Grover 10127c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 10137c9e7a6fSAndy Grover const char *page, ssize_t count) 10147c9e7a6fSAndy Grover { 10157c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10167c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 10177c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 10187c9e7a6fSAndy Grover int ret = 0, token; 10199c1cd1b6SAndy Grover unsigned long tmp_ul; 10207c9e7a6fSAndy Grover 10217c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 10227c9e7a6fSAndy Grover if (!opts) 10237c9e7a6fSAndy Grover return -ENOMEM; 10247c9e7a6fSAndy Grover 10257c9e7a6fSAndy Grover orig = opts; 10267c9e7a6fSAndy Grover 10277c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 10287c9e7a6fSAndy Grover if (!*ptr) 10297c9e7a6fSAndy Grover continue; 10307c9e7a6fSAndy Grover 10317c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 10327c9e7a6fSAndy Grover switch (token) { 10337c9e7a6fSAndy Grover case Opt_dev_config: 10347c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 10357c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 10367c9e7a6fSAndy Grover ret = -EINVAL; 10377c9e7a6fSAndy Grover break; 10387c9e7a6fSAndy Grover } 10397c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 10407c9e7a6fSAndy Grover break; 10417c9e7a6fSAndy Grover case Opt_dev_size: 10427c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 10437c9e7a6fSAndy Grover if (!arg_p) { 10447c9e7a6fSAndy Grover ret = -ENOMEM; 10457c9e7a6fSAndy Grover break; 10467c9e7a6fSAndy Grover } 10477c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 10487c9e7a6fSAndy Grover kfree(arg_p); 10497c9e7a6fSAndy Grover if (ret < 0) 10507c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 10517c9e7a6fSAndy Grover break; 10529c1cd1b6SAndy Grover case Opt_hw_block_size: 10539c1cd1b6SAndy Grover arg_p = match_strdup(&args[0]); 10549c1cd1b6SAndy Grover if (!arg_p) { 10559c1cd1b6SAndy Grover ret = -ENOMEM; 10569c1cd1b6SAndy Grover break; 10579c1cd1b6SAndy Grover } 10589c1cd1b6SAndy Grover ret = kstrtoul(arg_p, 0, &tmp_ul); 10599c1cd1b6SAndy Grover kfree(arg_p); 10609c1cd1b6SAndy Grover if (ret < 0) { 10619c1cd1b6SAndy Grover pr_err("kstrtoul() failed for hw_block_size=\n"); 10629c1cd1b6SAndy Grover break; 10639c1cd1b6SAndy Grover } 10649c1cd1b6SAndy Grover if (!tmp_ul) { 10659c1cd1b6SAndy Grover pr_err("hw_block_size must be nonzero\n"); 10669c1cd1b6SAndy Grover break; 10679c1cd1b6SAndy Grover } 10689c1cd1b6SAndy Grover dev->dev_attrib.hw_block_size = tmp_ul; 10699c1cd1b6SAndy Grover break; 10707c9e7a6fSAndy Grover default: 10717c9e7a6fSAndy Grover break; 10727c9e7a6fSAndy Grover } 10737c9e7a6fSAndy Grover } 10747c9e7a6fSAndy Grover 10757c9e7a6fSAndy Grover kfree(orig); 10767c9e7a6fSAndy Grover return (!ret) ? count : ret; 10777c9e7a6fSAndy Grover } 10787c9e7a6fSAndy Grover 10797c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 10807c9e7a6fSAndy Grover { 10817c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10827c9e7a6fSAndy Grover ssize_t bl = 0; 10837c9e7a6fSAndy Grover 10847c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 10857c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 10868ee83a74SAndy Grover bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 10877c9e7a6fSAndy Grover 10887c9e7a6fSAndy Grover return bl; 10897c9e7a6fSAndy Grover } 10907c9e7a6fSAndy Grover 10917c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 10927c9e7a6fSAndy Grover { 10937c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10947c9e7a6fSAndy Grover 10957c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 10967c9e7a6fSAndy Grover dev->dev_attrib.block_size); 10977c9e7a6fSAndy Grover } 10987c9e7a6fSAndy Grover 10997c9e7a6fSAndy Grover static sense_reason_t 11007c9e7a6fSAndy Grover tcmu_pass_op(struct se_cmd *se_cmd) 11017c9e7a6fSAndy Grover { 11027c9e7a6fSAndy Grover int ret = tcmu_queue_cmd(se_cmd); 11037c9e7a6fSAndy Grover 11047c9e7a6fSAndy Grover if (ret != 0) 11057c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11067c9e7a6fSAndy Grover else 11077c9e7a6fSAndy Grover return TCM_NO_SENSE; 11087c9e7a6fSAndy Grover } 11097c9e7a6fSAndy Grover 11107c9e7a6fSAndy Grover static sense_reason_t 11117c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 11127c9e7a6fSAndy Grover { 11137bfea53bSAndy Grover return passthrough_parse_cdb(cmd, tcmu_pass_op); 11149c1cd1b6SAndy Grover } 11159c1cd1b6SAndy Grover 11160a06d430SChristoph Hellwig static const struct target_backend_ops tcmu_ops = { 11177c9e7a6fSAndy Grover .name = "user", 11187c9e7a6fSAndy Grover .owner = THIS_MODULE, 1119a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 11207c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 11217c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 11227c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 11237c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 11247c9e7a6fSAndy Grover .free_device = tcmu_free_device, 11257c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 11267c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 11277c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 11287c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 11297c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 11305873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = passthrough_attrib_attrs, 11317c9e7a6fSAndy Grover }; 11327c9e7a6fSAndy Grover 11337c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 11347c9e7a6fSAndy Grover { 11357c9e7a6fSAndy Grover int ret; 11367c9e7a6fSAndy Grover 11377c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 11387c9e7a6fSAndy Grover 11397c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 11407c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 11417c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 11427c9e7a6fSAndy Grover 0, NULL); 11437c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 11447c9e7a6fSAndy Grover return -ENOMEM; 11457c9e7a6fSAndy Grover 11467c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 11477c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 11487c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 11497c9e7a6fSAndy Grover goto out_free_cache; 11507c9e7a6fSAndy Grover } 11517c9e7a6fSAndy Grover 11527c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 11537c9e7a6fSAndy Grover if (ret < 0) { 11547c9e7a6fSAndy Grover goto out_unreg_device; 11557c9e7a6fSAndy Grover } 11567c9e7a6fSAndy Grover 11570a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 11587c9e7a6fSAndy Grover if (ret) 11597c9e7a6fSAndy Grover goto out_unreg_genl; 11607c9e7a6fSAndy Grover 11617c9e7a6fSAndy Grover return 0; 11627c9e7a6fSAndy Grover 11637c9e7a6fSAndy Grover out_unreg_genl: 11647c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11657c9e7a6fSAndy Grover out_unreg_device: 11667c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11677c9e7a6fSAndy Grover out_free_cache: 11687c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11697c9e7a6fSAndy Grover 11707c9e7a6fSAndy Grover return ret; 11717c9e7a6fSAndy Grover } 11727c9e7a6fSAndy Grover 11737c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 11747c9e7a6fSAndy Grover { 11750a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 11767c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11777c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11787c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 11797c9e7a6fSAndy Grover } 11807c9e7a6fSAndy Grover 11817c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 11827c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 11837c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 11847c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 11857c9e7a6fSAndy Grover 11867c9e7a6fSAndy Grover module_init(tcmu_module_init); 11877c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1188