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> 2926418649SSheng Yang #include <linux/bitops.h> 307c9e7a6fSAndy Grover #include <net/genetlink.h> 31ba929992SBart Van Assche #include <scsi/scsi_common.h> 32ba929992SBart Van Assche #include <scsi/scsi_proto.h> 337c9e7a6fSAndy Grover #include <target/target_core_base.h> 347c9e7a6fSAndy Grover #include <target/target_core_fabric.h> 357c9e7a6fSAndy Grover #include <target/target_core_backend.h> 36e9f720d6SNicholas Bellinger 377c9e7a6fSAndy Grover #include <linux/target_core_user.h> 387c9e7a6fSAndy Grover 397c9e7a6fSAndy Grover /* 407c9e7a6fSAndy Grover * Define a shared-memory interface for LIO to pass SCSI commands and 417c9e7a6fSAndy Grover * data to userspace for processing. This is to allow backends that 427c9e7a6fSAndy Grover * are too complex for in-kernel support to be possible. 437c9e7a6fSAndy Grover * 447c9e7a6fSAndy Grover * It uses the UIO framework to do a lot of the device-creation and 457c9e7a6fSAndy Grover * introspection work for us. 467c9e7a6fSAndy Grover * 477c9e7a6fSAndy Grover * See the .h file for how the ring is laid out. Note that while the 487c9e7a6fSAndy Grover * command ring is defined, the particulars of the data area are 497c9e7a6fSAndy Grover * not. Offset values in the command entry point to other locations 507c9e7a6fSAndy Grover * internal to the mmap()ed area. There is separate space outside the 517c9e7a6fSAndy Grover * command ring for data buffers. This leaves maximum flexibility for 527c9e7a6fSAndy Grover * moving buffer allocations, or even page flipping or other 537c9e7a6fSAndy Grover * allocation techniques, without altering the command ring layout. 547c9e7a6fSAndy Grover * 557c9e7a6fSAndy Grover * SECURITY: 567c9e7a6fSAndy Grover * The user process must be assumed to be malicious. There's no way to 577c9e7a6fSAndy Grover * prevent it breaking the command ring protocol if it wants, but in 587c9e7a6fSAndy Grover * order to prevent other issues we must only ever read *data* from 597c9e7a6fSAndy Grover * the shared memory area, not offsets or sizes. This applies to 607c9e7a6fSAndy Grover * command ring entries as well as the mailbox. Extra code needed for 617c9e7a6fSAndy Grover * this may have a 'UAM' comment. 627c9e7a6fSAndy Grover */ 637c9e7a6fSAndy Grover 647c9e7a6fSAndy Grover 657c9e7a6fSAndy Grover #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) 667c9e7a6fSAndy Grover 6726418649SSheng Yang #define DATA_BLOCK_BITS 256 6826418649SSheng Yang #define DATA_BLOCK_SIZE 4096 6926418649SSheng Yang 707c9e7a6fSAndy Grover #define CMDR_SIZE (16 * 4096) 7126418649SSheng Yang #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) 727c9e7a6fSAndy Grover 737c9e7a6fSAndy Grover #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) 747c9e7a6fSAndy Grover 757c9e7a6fSAndy Grover static struct device *tcmu_root_device; 767c9e7a6fSAndy Grover 777c9e7a6fSAndy Grover struct tcmu_hba { 787c9e7a6fSAndy Grover u32 host_id; 797c9e7a6fSAndy Grover }; 807c9e7a6fSAndy Grover 817c9e7a6fSAndy Grover #define TCMU_CONFIG_LEN 256 827c9e7a6fSAndy Grover 837c9e7a6fSAndy Grover struct tcmu_dev { 847c9e7a6fSAndy Grover struct se_device se_dev; 857c9e7a6fSAndy Grover 867c9e7a6fSAndy Grover char *name; 877c9e7a6fSAndy Grover struct se_hba *hba; 887c9e7a6fSAndy Grover 897c9e7a6fSAndy Grover #define TCMU_DEV_BIT_OPEN 0 907c9e7a6fSAndy Grover #define TCMU_DEV_BIT_BROKEN 1 917c9e7a6fSAndy Grover unsigned long flags; 927c9e7a6fSAndy Grover 937c9e7a6fSAndy Grover struct uio_info uio_info; 947c9e7a6fSAndy Grover 957c9e7a6fSAndy Grover struct tcmu_mailbox *mb_addr; 967c9e7a6fSAndy Grover size_t dev_size; 977c9e7a6fSAndy Grover u32 cmdr_size; 987c9e7a6fSAndy Grover u32 cmdr_last_cleaned; 997c9e7a6fSAndy Grover /* Offset of data ring from start of mb */ 10026418649SSheng Yang /* Must add data_off and mb_addr to get the address */ 1017c9e7a6fSAndy Grover size_t data_off; 1027c9e7a6fSAndy Grover size_t data_size; 10326418649SSheng Yang 10426418649SSheng Yang DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); 1057c9e7a6fSAndy Grover 1067c9e7a6fSAndy Grover wait_queue_head_t wait_cmdr; 1077c9e7a6fSAndy Grover /* TODO should this be a mutex? */ 1087c9e7a6fSAndy Grover spinlock_t cmdr_lock; 1097c9e7a6fSAndy Grover 1107c9e7a6fSAndy Grover struct idr commands; 1117c9e7a6fSAndy Grover spinlock_t commands_lock; 1127c9e7a6fSAndy Grover 1137c9e7a6fSAndy Grover struct timer_list timeout; 1147c9e7a6fSAndy Grover 1157c9e7a6fSAndy Grover char dev_config[TCMU_CONFIG_LEN]; 1167c9e7a6fSAndy Grover }; 1177c9e7a6fSAndy Grover 1187c9e7a6fSAndy Grover #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) 1197c9e7a6fSAndy Grover 1207c9e7a6fSAndy Grover #define CMDR_OFF sizeof(struct tcmu_mailbox) 1217c9e7a6fSAndy Grover 1227c9e7a6fSAndy Grover struct tcmu_cmd { 1237c9e7a6fSAndy Grover struct se_cmd *se_cmd; 1247c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev; 1257c9e7a6fSAndy Grover 1267c9e7a6fSAndy Grover uint16_t cmd_id; 1277c9e7a6fSAndy Grover 12826418649SSheng Yang /* Can't use se_cmd when cleaning up expired cmds, because if 1297c9e7a6fSAndy Grover cmd has been completed then accessing se_cmd is off limits */ 13026418649SSheng Yang DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); 1317c9e7a6fSAndy Grover 1327c9e7a6fSAndy Grover unsigned long deadline; 1337c9e7a6fSAndy Grover 1347c9e7a6fSAndy Grover #define TCMU_CMD_BIT_EXPIRED 0 1357c9e7a6fSAndy Grover unsigned long flags; 1367c9e7a6fSAndy Grover }; 1377c9e7a6fSAndy Grover 1387c9e7a6fSAndy Grover static struct kmem_cache *tcmu_cmd_cache; 1397c9e7a6fSAndy Grover 1407c9e7a6fSAndy Grover /* multicast group */ 1417c9e7a6fSAndy Grover enum tcmu_multicast_groups { 1427c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, 1437c9e7a6fSAndy Grover }; 1447c9e7a6fSAndy Grover 1457c9e7a6fSAndy Grover static const struct genl_multicast_group tcmu_mcgrps[] = { 1467c9e7a6fSAndy Grover [TCMU_MCGRP_CONFIG] = { .name = "config", }, 1477c9e7a6fSAndy Grover }; 1487c9e7a6fSAndy Grover 1497c9e7a6fSAndy Grover /* Our generic netlink family */ 1507c9e7a6fSAndy Grover static struct genl_family tcmu_genl_family = { 151489111e5SJohannes Berg .module = THIS_MODULE, 1527c9e7a6fSAndy Grover .hdrsize = 0, 1537c9e7a6fSAndy Grover .name = "TCM-USER", 1547c9e7a6fSAndy Grover .version = 1, 1557c9e7a6fSAndy Grover .maxattr = TCMU_ATTR_MAX, 1567c9e7a6fSAndy Grover .mcgrps = tcmu_mcgrps, 1577c9e7a6fSAndy Grover .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), 15820c08b36SSheng Yang .netnsok = true, 1597c9e7a6fSAndy Grover }; 1607c9e7a6fSAndy Grover 1617c9e7a6fSAndy Grover static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) 1627c9e7a6fSAndy Grover { 1637c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 1647c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 1657c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 1667c9e7a6fSAndy Grover int cmd_id; 1677c9e7a6fSAndy Grover 1687c9e7a6fSAndy Grover tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); 1697c9e7a6fSAndy Grover if (!tcmu_cmd) 1707c9e7a6fSAndy Grover return NULL; 1717c9e7a6fSAndy Grover 1727c9e7a6fSAndy Grover tcmu_cmd->se_cmd = se_cmd; 1737c9e7a6fSAndy Grover tcmu_cmd->tcmu_dev = udev; 1747c9e7a6fSAndy Grover tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); 1757c9e7a6fSAndy Grover 1767c9e7a6fSAndy Grover idr_preload(GFP_KERNEL); 1777c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1787c9e7a6fSAndy Grover cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, 1797c9e7a6fSAndy Grover USHRT_MAX, GFP_NOWAIT); 1807c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1817c9e7a6fSAndy Grover idr_preload_end(); 1827c9e7a6fSAndy Grover 1837c9e7a6fSAndy Grover if (cmd_id < 0) { 1847c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 1857c9e7a6fSAndy Grover return NULL; 1867c9e7a6fSAndy Grover } 1877c9e7a6fSAndy Grover tcmu_cmd->cmd_id = cmd_id; 1887c9e7a6fSAndy Grover 1897c9e7a6fSAndy Grover return tcmu_cmd; 1907c9e7a6fSAndy Grover } 1917c9e7a6fSAndy Grover 1927c9e7a6fSAndy Grover static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) 1937c9e7a6fSAndy Grover { 194b75d8063SGeliang Tang unsigned long offset = offset_in_page(vaddr); 1957c9e7a6fSAndy Grover 1967c9e7a6fSAndy Grover size = round_up(size+offset, PAGE_SIZE); 1977c9e7a6fSAndy Grover vaddr -= offset; 1987c9e7a6fSAndy Grover 1997c9e7a6fSAndy Grover while (size) { 2007c9e7a6fSAndy Grover flush_dcache_page(virt_to_page(vaddr)); 2017c9e7a6fSAndy Grover size -= PAGE_SIZE; 2027c9e7a6fSAndy Grover } 2037c9e7a6fSAndy Grover } 2047c9e7a6fSAndy Grover 2057c9e7a6fSAndy Grover /* 2067c9e7a6fSAndy Grover * Some ring helper functions. We don't assume size is a power of 2 so 2077c9e7a6fSAndy Grover * we can't use circ_buf.h. 2087c9e7a6fSAndy Grover */ 2097c9e7a6fSAndy Grover static inline size_t spc_used(size_t head, size_t tail, size_t size) 2107c9e7a6fSAndy Grover { 2117c9e7a6fSAndy Grover int diff = head - tail; 2127c9e7a6fSAndy Grover 2137c9e7a6fSAndy Grover if (diff >= 0) 2147c9e7a6fSAndy Grover return diff; 2157c9e7a6fSAndy Grover else 2167c9e7a6fSAndy Grover return size + diff; 2177c9e7a6fSAndy Grover } 2187c9e7a6fSAndy Grover 2197c9e7a6fSAndy Grover static inline size_t spc_free(size_t head, size_t tail, size_t size) 2207c9e7a6fSAndy Grover { 2217c9e7a6fSAndy Grover /* Keep 1 byte unused or we can't tell full from empty */ 2227c9e7a6fSAndy Grover return (size - spc_used(head, tail, size) - 1); 2237c9e7a6fSAndy Grover } 2247c9e7a6fSAndy Grover 2257c9e7a6fSAndy Grover static inline size_t head_to_end(size_t head, size_t size) 2267c9e7a6fSAndy Grover { 2277c9e7a6fSAndy Grover return size - head; 2287c9e7a6fSAndy Grover } 2297c9e7a6fSAndy Grover 230f1dbd087SSheng Yang static inline void new_iov(struct iovec **iov, int *iov_cnt, 231f1dbd087SSheng Yang struct tcmu_dev *udev) 232f1dbd087SSheng Yang { 233f1dbd087SSheng Yang struct iovec *iovec; 234f1dbd087SSheng Yang 235f1dbd087SSheng Yang if (*iov_cnt != 0) 236f1dbd087SSheng Yang (*iov)++; 237f1dbd087SSheng Yang (*iov_cnt)++; 238f1dbd087SSheng Yang 239f1dbd087SSheng Yang iovec = *iov; 240f1dbd087SSheng Yang memset(iovec, 0, sizeof(struct iovec)); 241f1dbd087SSheng Yang } 242f1dbd087SSheng Yang 2437c9e7a6fSAndy Grover #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) 2447c9e7a6fSAndy Grover 24526418649SSheng Yang /* offset is relative to mb_addr */ 24626418649SSheng Yang static inline size_t get_block_offset(struct tcmu_dev *dev, 24726418649SSheng Yang int block, int remaining) 24826418649SSheng Yang { 24926418649SSheng Yang return dev->data_off + block * DATA_BLOCK_SIZE + 25026418649SSheng Yang DATA_BLOCK_SIZE - remaining; 25126418649SSheng Yang } 25226418649SSheng Yang 25326418649SSheng Yang static inline size_t iov_tail(struct tcmu_dev *udev, struct iovec *iov) 25426418649SSheng Yang { 25526418649SSheng Yang return (size_t)iov->iov_base + iov->iov_len; 25626418649SSheng Yang } 25726418649SSheng Yang 258f97ec7dbSIlias Tsitsimpis static void alloc_and_scatter_data_area(struct tcmu_dev *udev, 259f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents, 260f97ec7dbSIlias Tsitsimpis struct iovec **iov, int *iov_cnt, bool copy_data) 261f97ec7dbSIlias Tsitsimpis { 26226418649SSheng Yang int i, block; 26326418649SSheng Yang int block_remaining = 0; 264f97ec7dbSIlias Tsitsimpis void *from, *to; 26526418649SSheng Yang size_t copy_bytes, to_offset; 266f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 267f97ec7dbSIlias Tsitsimpis 268f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 26926418649SSheng Yang int sg_remaining = sg->length; 270f97ec7dbSIlias Tsitsimpis from = kmap_atomic(sg_page(sg)) + sg->offset; 27126418649SSheng Yang while (sg_remaining > 0) { 27226418649SSheng Yang if (block_remaining == 0) { 27326418649SSheng Yang block = find_first_zero_bit(udev->data_bitmap, 27426418649SSheng Yang DATA_BLOCK_BITS); 27526418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 27626418649SSheng Yang set_bit(block, udev->data_bitmap); 277f97ec7dbSIlias Tsitsimpis } 27826418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 27926418649SSheng Yang block_remaining); 28026418649SSheng Yang to_offset = get_block_offset(udev, block, 28126418649SSheng Yang block_remaining); 28226418649SSheng Yang to = (void *)udev->mb_addr + to_offset; 28326418649SSheng Yang if (*iov_cnt != 0 && 28426418649SSheng Yang to_offset == iov_tail(udev, *iov)) { 285f1dbd087SSheng Yang (*iov)->iov_len += copy_bytes; 28626418649SSheng Yang } else { 287f1dbd087SSheng Yang new_iov(iov, iov_cnt, udev); 28826418649SSheng Yang (*iov)->iov_base = (void __user *) to_offset; 289f97ec7dbSIlias Tsitsimpis (*iov)->iov_len = copy_bytes; 29026418649SSheng Yang } 291f97ec7dbSIlias Tsitsimpis if (copy_data) { 29226418649SSheng Yang memcpy(to, from + sg->length - sg_remaining, 29326418649SSheng Yang copy_bytes); 294f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(to, copy_bytes); 295f97ec7dbSIlias Tsitsimpis } 29626418649SSheng Yang sg_remaining -= copy_bytes; 29726418649SSheng Yang block_remaining -= copy_bytes; 298f97ec7dbSIlias Tsitsimpis } 299e2e21bd8SSagi Grimberg kunmap_atomic(from - sg->offset); 300f97ec7dbSIlias Tsitsimpis } 301f97ec7dbSIlias Tsitsimpis } 302f97ec7dbSIlias Tsitsimpis 30326418649SSheng Yang static void free_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd) 3040c28481fSSheng Yang { 30526418649SSheng Yang bitmap_xor(udev->data_bitmap, udev->data_bitmap, cmd->data_bitmap, 30626418649SSheng Yang DATA_BLOCK_BITS); 3070c28481fSSheng Yang } 3080c28481fSSheng Yang 30926418649SSheng Yang static void gather_data_area(struct tcmu_dev *udev, unsigned long *cmd_bitmap, 310f97ec7dbSIlias Tsitsimpis struct scatterlist *data_sg, unsigned int data_nents) 311f97ec7dbSIlias Tsitsimpis { 31226418649SSheng Yang int i, block; 31326418649SSheng Yang int block_remaining = 0; 314f97ec7dbSIlias Tsitsimpis void *from, *to; 31526418649SSheng Yang size_t copy_bytes, from_offset; 316f97ec7dbSIlias Tsitsimpis struct scatterlist *sg; 317f97ec7dbSIlias Tsitsimpis 318f97ec7dbSIlias Tsitsimpis for_each_sg(data_sg, sg, data_nents, i) { 31926418649SSheng Yang int sg_remaining = sg->length; 320f97ec7dbSIlias Tsitsimpis to = kmap_atomic(sg_page(sg)) + sg->offset; 32126418649SSheng Yang while (sg_remaining > 0) { 32226418649SSheng Yang if (block_remaining == 0) { 32326418649SSheng Yang block = find_first_bit(cmd_bitmap, 32426418649SSheng Yang DATA_BLOCK_BITS); 32526418649SSheng Yang block_remaining = DATA_BLOCK_SIZE; 32626418649SSheng Yang clear_bit(block, cmd_bitmap); 32726418649SSheng Yang } 32826418649SSheng Yang copy_bytes = min_t(size_t, sg_remaining, 32926418649SSheng Yang block_remaining); 33026418649SSheng Yang from_offset = get_block_offset(udev, block, 33126418649SSheng Yang block_remaining); 33226418649SSheng Yang from = (void *) udev->mb_addr + from_offset; 333f97ec7dbSIlias Tsitsimpis tcmu_flush_dcache_range(from, copy_bytes); 33426418649SSheng Yang memcpy(to + sg->length - sg_remaining, from, 33526418649SSheng Yang copy_bytes); 336f97ec7dbSIlias Tsitsimpis 33726418649SSheng Yang sg_remaining -= copy_bytes; 33826418649SSheng Yang block_remaining -= copy_bytes; 339f97ec7dbSIlias Tsitsimpis } 340e2e21bd8SSagi Grimberg kunmap_atomic(to - sg->offset); 341f97ec7dbSIlias Tsitsimpis } 342f97ec7dbSIlias Tsitsimpis } 343f97ec7dbSIlias Tsitsimpis 34426418649SSheng Yang static inline size_t spc_bitmap_free(unsigned long *bitmap) 34526418649SSheng Yang { 34626418649SSheng Yang return DATA_BLOCK_SIZE * (DATA_BLOCK_BITS - 34726418649SSheng Yang bitmap_weight(bitmap, DATA_BLOCK_BITS)); 34826418649SSheng Yang } 34926418649SSheng Yang 3507c9e7a6fSAndy Grover /* 351f97ec7dbSIlias Tsitsimpis * We can't queue a command until we have space available on the cmd ring *and* 352f97ec7dbSIlias Tsitsimpis * space available on the data ring. 3537c9e7a6fSAndy Grover * 3547c9e7a6fSAndy Grover * Called with ring lock held. 3557c9e7a6fSAndy Grover */ 356f56574a2SAndy Grover static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) 3577c9e7a6fSAndy Grover { 3587c9e7a6fSAndy Grover struct tcmu_mailbox *mb = udev->mb_addr; 3590241fd39SNicholas Bellinger size_t space, cmd_needed; 3607c9e7a6fSAndy Grover u32 cmd_head; 3617c9e7a6fSAndy Grover 3627c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 3637c9e7a6fSAndy Grover 3647c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 3657c9e7a6fSAndy Grover 366f56574a2SAndy Grover /* 367f56574a2SAndy Grover * If cmd end-of-ring space is too small then we need space for a NOP plus 368f56574a2SAndy Grover * original cmd - cmds are internally contiguous. 369f56574a2SAndy Grover */ 370f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) 371f56574a2SAndy Grover cmd_needed = cmd_size; 372f56574a2SAndy Grover else 373f56574a2SAndy Grover cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); 374f56574a2SAndy Grover 3757c9e7a6fSAndy Grover space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); 3767c9e7a6fSAndy Grover if (space < cmd_needed) { 3777c9e7a6fSAndy Grover pr_debug("no cmd space: %u %u %u\n", cmd_head, 3787c9e7a6fSAndy Grover udev->cmdr_last_cleaned, udev->cmdr_size); 3797c9e7a6fSAndy Grover return false; 3807c9e7a6fSAndy Grover } 3817c9e7a6fSAndy Grover 38226418649SSheng Yang space = spc_bitmap_free(udev->data_bitmap); 3837c9e7a6fSAndy Grover if (space < data_needed) { 3840241fd39SNicholas Bellinger pr_debug("no data space: only %zu available, but ask for %zu\n", 38526418649SSheng Yang space, data_needed); 3867c9e7a6fSAndy Grover return false; 3877c9e7a6fSAndy Grover } 3887c9e7a6fSAndy Grover 3897c9e7a6fSAndy Grover return true; 3907c9e7a6fSAndy Grover } 3917c9e7a6fSAndy Grover 3927c9e7a6fSAndy Grover static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) 3937c9e7a6fSAndy Grover { 3947c9e7a6fSAndy Grover struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; 3957c9e7a6fSAndy Grover struct se_cmd *se_cmd = tcmu_cmd->se_cmd; 3967c9e7a6fSAndy Grover size_t base_command_size, command_size; 3977c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 3987c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry; 3997c9e7a6fSAndy Grover struct iovec *iov; 400f97ec7dbSIlias Tsitsimpis int iov_cnt; 4017c9e7a6fSAndy Grover uint32_t cmd_head; 4027c9e7a6fSAndy Grover uint64_t cdb_off; 403f97ec7dbSIlias Tsitsimpis bool copy_to_data_area; 40426418649SSheng Yang size_t data_length; 40526418649SSheng Yang DECLARE_BITMAP(old_bitmap, DATA_BLOCK_BITS); 4067c9e7a6fSAndy Grover 4077c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) 4087c9e7a6fSAndy Grover return -EINVAL; 4097c9e7a6fSAndy Grover 4107c9e7a6fSAndy Grover /* 4117c9e7a6fSAndy Grover * Must be a certain minimum size for response sense info, but 4127c9e7a6fSAndy Grover * also may be larger if the iov array is large. 4137c9e7a6fSAndy Grover * 41426418649SSheng Yang * We prepare way too many iovs for potential uses here, because it's 41526418649SSheng Yang * expensive to tell how many regions are freed in the bitmap 4167c9e7a6fSAndy Grover */ 41726418649SSheng Yang base_command_size = max(offsetof(struct tcmu_cmd_entry, 41826418649SSheng Yang req.iov[se_cmd->t_bidi_data_nents + 41926418649SSheng Yang se_cmd->t_data_nents]), 4207c9e7a6fSAndy Grover sizeof(struct tcmu_cmd_entry)); 4217c9e7a6fSAndy Grover command_size = base_command_size 4227c9e7a6fSAndy Grover + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); 4237c9e7a6fSAndy Grover 4247c9e7a6fSAndy Grover WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); 4257c9e7a6fSAndy Grover 4267c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4277c9e7a6fSAndy Grover 4287c9e7a6fSAndy Grover mb = udev->mb_addr; 4297c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 43026418649SSheng Yang data_length = se_cmd->data_length; 43126418649SSheng Yang if (se_cmd->se_cmd_flags & SCF_BIDI) { 43226418649SSheng Yang BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); 43326418649SSheng Yang data_length += se_cmd->t_bidi_data_sg->length; 43426418649SSheng Yang } 4357c9e7a6fSAndy Grover if ((command_size > (udev->cmdr_size / 2)) 43626418649SSheng Yang || data_length > udev->data_size) 4377c9e7a6fSAndy Grover pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " 43826418649SSheng Yang "cmd/data ring buffers\n", command_size, data_length, 4397c9e7a6fSAndy Grover udev->cmdr_size, udev->data_size); 4407c9e7a6fSAndy Grover 44126418649SSheng Yang while (!is_ring_space_avail(udev, command_size, data_length)) { 4427c9e7a6fSAndy Grover int ret; 4437c9e7a6fSAndy Grover DEFINE_WAIT(__wait); 4447c9e7a6fSAndy Grover 4457c9e7a6fSAndy Grover prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); 4467c9e7a6fSAndy Grover 4477c9e7a6fSAndy Grover pr_debug("sleeping for ring space\n"); 4487c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 4497c9e7a6fSAndy Grover ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); 4507c9e7a6fSAndy Grover finish_wait(&udev->wait_cmdr, &__wait); 4517c9e7a6fSAndy Grover if (!ret) { 4527c9e7a6fSAndy Grover pr_warn("tcmu: command timed out\n"); 4537c9e7a6fSAndy Grover return -ETIMEDOUT; 4547c9e7a6fSAndy Grover } 4557c9e7a6fSAndy Grover 4567c9e7a6fSAndy Grover spin_lock_irq(&udev->cmdr_lock); 4577c9e7a6fSAndy Grover 4587c9e7a6fSAndy Grover /* We dropped cmdr_lock, cmd_head is stale */ 4597c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4607c9e7a6fSAndy Grover } 4617c9e7a6fSAndy Grover 462f56574a2SAndy Grover /* Insert a PAD if end-of-ring space is too small */ 463f56574a2SAndy Grover if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { 464f56574a2SAndy Grover size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); 465f56574a2SAndy Grover 4667c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4677c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4680ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); 4690ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); 4700ad46af8SAndy Grover entry->hdr.cmd_id = 0; /* not used for PAD */ 4710ad46af8SAndy Grover entry->hdr.kflags = 0; 4720ad46af8SAndy Grover entry->hdr.uflags = 0; 4737c9e7a6fSAndy Grover 4747c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); 4757c9e7a6fSAndy Grover 4767c9e7a6fSAndy Grover cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ 4777c9e7a6fSAndy Grover WARN_ON(cmd_head != 0); 4787c9e7a6fSAndy Grover } 4797c9e7a6fSAndy Grover 4807c9e7a6fSAndy Grover entry = (void *) mb + CMDR_OFF + cmd_head; 4817c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 4820ad46af8SAndy Grover tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); 4830ad46af8SAndy Grover tcmu_hdr_set_len(&entry->hdr.len_op, command_size); 4840ad46af8SAndy Grover entry->hdr.cmd_id = tcmu_cmd->cmd_id; 4850ad46af8SAndy Grover entry->hdr.kflags = 0; 4860ad46af8SAndy Grover entry->hdr.uflags = 0; 4877c9e7a6fSAndy Grover 48826418649SSheng Yang bitmap_copy(old_bitmap, udev->data_bitmap, DATA_BLOCK_BITS); 48926418649SSheng Yang 4907c9e7a6fSAndy Grover /* 4917c9e7a6fSAndy Grover * Fix up iovecs, and handle if allocation in data ring wrapped. 4927c9e7a6fSAndy Grover */ 4937c9e7a6fSAndy Grover iov = &entry->req.iov[0]; 494f97ec7dbSIlias Tsitsimpis iov_cnt = 0; 495e4648b01SIlias Tsitsimpis copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE 496e4648b01SIlias Tsitsimpis || se_cmd->se_cmd_flags & SCF_BIDI); 497f97ec7dbSIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, 498f97ec7dbSIlias Tsitsimpis se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); 4997c9e7a6fSAndy Grover entry->req.iov_cnt = iov_cnt; 5000ad46af8SAndy Grover entry->req.iov_dif_cnt = 0; 5017c9e7a6fSAndy Grover 502e4648b01SIlias Tsitsimpis /* Handle BIDI commands */ 503e4648b01SIlias Tsitsimpis iov_cnt = 0; 504e4648b01SIlias Tsitsimpis alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, 505e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); 506e4648b01SIlias Tsitsimpis entry->req.iov_bidi_cnt = iov_cnt; 507e4648b01SIlias Tsitsimpis 50826418649SSheng Yang /* cmd's data_bitmap is what changed in process */ 50926418649SSheng Yang bitmap_xor(tcmu_cmd->data_bitmap, old_bitmap, udev->data_bitmap, 51026418649SSheng Yang DATA_BLOCK_BITS); 51126418649SSheng Yang 5127c9e7a6fSAndy Grover /* All offsets relative to mb_addr, not start of entry! */ 5137c9e7a6fSAndy Grover cdb_off = CMDR_OFF + cmd_head + base_command_size; 5147c9e7a6fSAndy Grover memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); 5157c9e7a6fSAndy Grover entry->req.cdb_off = cdb_off; 5167c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 5177c9e7a6fSAndy Grover 5187c9e7a6fSAndy Grover UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); 5197c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 5207c9e7a6fSAndy Grover 5217c9e7a6fSAndy Grover spin_unlock_irq(&udev->cmdr_lock); 5227c9e7a6fSAndy Grover 5237c9e7a6fSAndy Grover /* TODO: only if FLUSH and FUA? */ 5247c9e7a6fSAndy Grover uio_event_notify(&udev->uio_info); 5257c9e7a6fSAndy Grover 5267c9e7a6fSAndy Grover mod_timer(&udev->timeout, 5277c9e7a6fSAndy Grover round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); 5287c9e7a6fSAndy Grover 5297c9e7a6fSAndy Grover return 0; 5307c9e7a6fSAndy Grover } 5317c9e7a6fSAndy Grover 5327c9e7a6fSAndy Grover static int tcmu_queue_cmd(struct se_cmd *se_cmd) 5337c9e7a6fSAndy Grover { 5347c9e7a6fSAndy Grover struct se_device *se_dev = se_cmd->se_dev; 5357c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(se_dev); 5367c9e7a6fSAndy Grover struct tcmu_cmd *tcmu_cmd; 5377c9e7a6fSAndy Grover int ret; 5387c9e7a6fSAndy Grover 5397c9e7a6fSAndy Grover tcmu_cmd = tcmu_alloc_cmd(se_cmd); 5407c9e7a6fSAndy Grover if (!tcmu_cmd) 5417c9e7a6fSAndy Grover return -ENOMEM; 5427c9e7a6fSAndy Grover 5437c9e7a6fSAndy Grover ret = tcmu_queue_cmd_ring(tcmu_cmd); 5447c9e7a6fSAndy Grover if (ret < 0) { 5457c9e7a6fSAndy Grover pr_err("TCMU: Could not queue command\n"); 5467c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 5477c9e7a6fSAndy Grover idr_remove(&udev->commands, tcmu_cmd->cmd_id); 5487c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 5497c9e7a6fSAndy Grover 5507c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); 5517c9e7a6fSAndy Grover } 5527c9e7a6fSAndy Grover 5537c9e7a6fSAndy Grover return ret; 5547c9e7a6fSAndy Grover } 5557c9e7a6fSAndy Grover 5567c9e7a6fSAndy Grover static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) 5577c9e7a6fSAndy Grover { 5587c9e7a6fSAndy Grover struct se_cmd *se_cmd = cmd->se_cmd; 5597c9e7a6fSAndy Grover struct tcmu_dev *udev = cmd->tcmu_dev; 5607c9e7a6fSAndy Grover 5617c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 562b25c7863SSheng Yang /* 563b25c7863SSheng Yang * cmd has been completed already from timeout, just reclaim 564b25c7863SSheng Yang * data ring space and free cmd 565b25c7863SSheng Yang */ 56626418649SSheng Yang free_data_area(udev, cmd); 567b25c7863SSheng Yang 568b25c7863SSheng Yang kmem_cache_free(tcmu_cmd_cache, cmd); 5697c9e7a6fSAndy Grover return; 5707c9e7a6fSAndy Grover } 5717c9e7a6fSAndy Grover 5720ad46af8SAndy Grover if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { 57326418649SSheng Yang free_data_area(udev, cmd); 5740ad46af8SAndy Grover pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", 5750ad46af8SAndy Grover cmd->se_cmd); 576ed97d0cdSAndy Grover entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; 577ed97d0cdSAndy Grover } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { 5787c9e7a6fSAndy Grover memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, 5797c9e7a6fSAndy Grover se_cmd->scsi_sense_length); 58026418649SSheng Yang free_data_area(udev, cmd); 581e4648b01SIlias Tsitsimpis } else if (se_cmd->se_cmd_flags & SCF_BIDI) { 58226418649SSheng Yang DECLARE_BITMAP(bitmap, DATA_BLOCK_BITS); 5837c9e7a6fSAndy Grover 58426418649SSheng Yang /* Get Data-In buffer before clean up */ 58526418649SSheng Yang bitmap_copy(bitmap, cmd->data_bitmap, DATA_BLOCK_BITS); 58626418649SSheng Yang gather_data_area(udev, bitmap, 587e4648b01SIlias Tsitsimpis se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); 58826418649SSheng Yang free_data_area(udev, cmd); 589e4648b01SIlias Tsitsimpis } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { 59026418649SSheng Yang DECLARE_BITMAP(bitmap, DATA_BLOCK_BITS); 59126418649SSheng Yang 59226418649SSheng Yang bitmap_copy(bitmap, cmd->data_bitmap, DATA_BLOCK_BITS); 59326418649SSheng Yang gather_data_area(udev, bitmap, 594f97ec7dbSIlias Tsitsimpis se_cmd->t_data_sg, se_cmd->t_data_nents); 59526418649SSheng Yang free_data_area(udev, cmd); 5967c9e7a6fSAndy Grover } else if (se_cmd->data_direction == DMA_TO_DEVICE) { 59726418649SSheng Yang free_data_area(udev, cmd); 5982bc396a2SIlias Tsitsimpis } else if (se_cmd->data_direction != DMA_NONE) { 5992bc396a2SIlias Tsitsimpis pr_warn("TCMU: data direction was %d!\n", 6002bc396a2SIlias Tsitsimpis se_cmd->data_direction); 6017c9e7a6fSAndy Grover } 6027c9e7a6fSAndy Grover 6037c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); 6047c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6057c9e7a6fSAndy Grover 6067c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6077c9e7a6fSAndy Grover } 6087c9e7a6fSAndy Grover 6097c9e7a6fSAndy Grover static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) 6107c9e7a6fSAndy Grover { 6117c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 6127c9e7a6fSAndy Grover unsigned long flags; 6137c9e7a6fSAndy Grover int handled = 0; 6147c9e7a6fSAndy Grover 6157c9e7a6fSAndy Grover if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { 6167c9e7a6fSAndy Grover pr_err("ring broken, not handling completions\n"); 6177c9e7a6fSAndy Grover return 0; 6187c9e7a6fSAndy Grover } 6197c9e7a6fSAndy Grover 6207c9e7a6fSAndy Grover spin_lock_irqsave(&udev->cmdr_lock, flags); 6217c9e7a6fSAndy Grover 6227c9e7a6fSAndy Grover mb = udev->mb_addr; 6237c9e7a6fSAndy Grover tcmu_flush_dcache_range(mb, sizeof(*mb)); 6247c9e7a6fSAndy Grover 6257c9e7a6fSAndy Grover while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { 6267c9e7a6fSAndy Grover 6277c9e7a6fSAndy Grover struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; 6287c9e7a6fSAndy Grover struct tcmu_cmd *cmd; 6297c9e7a6fSAndy Grover 6307c9e7a6fSAndy Grover tcmu_flush_dcache_range(entry, sizeof(*entry)); 6317c9e7a6fSAndy Grover 6320ad46af8SAndy Grover if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { 6330ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 6340ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 6350ad46af8SAndy Grover udev->cmdr_size); 6367c9e7a6fSAndy Grover continue; 6377c9e7a6fSAndy Grover } 6380ad46af8SAndy Grover WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); 6397c9e7a6fSAndy Grover 6407c9e7a6fSAndy Grover spin_lock(&udev->commands_lock); 6410ad46af8SAndy Grover cmd = idr_find(&udev->commands, entry->hdr.cmd_id); 6427c9e7a6fSAndy Grover if (cmd) 6437c9e7a6fSAndy Grover idr_remove(&udev->commands, cmd->cmd_id); 6447c9e7a6fSAndy Grover spin_unlock(&udev->commands_lock); 6457c9e7a6fSAndy Grover 6467c9e7a6fSAndy Grover if (!cmd) { 6477c9e7a6fSAndy Grover pr_err("cmd_id not found, ring is broken\n"); 6487c9e7a6fSAndy Grover set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); 6497c9e7a6fSAndy Grover break; 6507c9e7a6fSAndy Grover } 6517c9e7a6fSAndy Grover 6527c9e7a6fSAndy Grover tcmu_handle_completion(cmd, entry); 6537c9e7a6fSAndy Grover 6540ad46af8SAndy Grover UPDATE_HEAD(udev->cmdr_last_cleaned, 6550ad46af8SAndy Grover tcmu_hdr_get_len(entry->hdr.len_op), 6560ad46af8SAndy Grover udev->cmdr_size); 6577c9e7a6fSAndy Grover 6587c9e7a6fSAndy Grover handled++; 6597c9e7a6fSAndy Grover } 6607c9e7a6fSAndy Grover 6617c9e7a6fSAndy Grover if (mb->cmd_tail == mb->cmd_head) 6627c9e7a6fSAndy Grover del_timer(&udev->timeout); /* no more pending cmds */ 6637c9e7a6fSAndy Grover 6647c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->cmdr_lock, flags); 6657c9e7a6fSAndy Grover 6667c9e7a6fSAndy Grover wake_up(&udev->wait_cmdr); 6677c9e7a6fSAndy Grover 6687c9e7a6fSAndy Grover return handled; 6697c9e7a6fSAndy Grover } 6707c9e7a6fSAndy Grover 6717c9e7a6fSAndy Grover static int tcmu_check_expired_cmd(int id, void *p, void *data) 6727c9e7a6fSAndy Grover { 6737c9e7a6fSAndy Grover struct tcmu_cmd *cmd = p; 6747c9e7a6fSAndy Grover 6757c9e7a6fSAndy Grover if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) 6767c9e7a6fSAndy Grover return 0; 6777c9e7a6fSAndy Grover 678611e2267SAndy Grover if (!time_after(jiffies, cmd->deadline)) 6797c9e7a6fSAndy Grover return 0; 6807c9e7a6fSAndy Grover 6817c9e7a6fSAndy Grover set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); 6827c9e7a6fSAndy Grover target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); 6837c9e7a6fSAndy Grover cmd->se_cmd = NULL; 6847c9e7a6fSAndy Grover 6857c9e7a6fSAndy Grover kmem_cache_free(tcmu_cmd_cache, cmd); 6867c9e7a6fSAndy Grover 6877c9e7a6fSAndy Grover return 0; 6887c9e7a6fSAndy Grover } 6897c9e7a6fSAndy Grover 6907c9e7a6fSAndy Grover static void tcmu_device_timedout(unsigned long data) 6917c9e7a6fSAndy Grover { 6927c9e7a6fSAndy Grover struct tcmu_dev *udev = (struct tcmu_dev *)data; 6937c9e7a6fSAndy Grover unsigned long flags; 6947c9e7a6fSAndy Grover int handled; 6957c9e7a6fSAndy Grover 6967c9e7a6fSAndy Grover handled = tcmu_handle_completions(udev); 6977c9e7a6fSAndy Grover 6987c9e7a6fSAndy Grover pr_warn("%d completions handled from timeout\n", handled); 6997c9e7a6fSAndy Grover 7007c9e7a6fSAndy Grover spin_lock_irqsave(&udev->commands_lock, flags); 7017c9e7a6fSAndy Grover idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); 7027c9e7a6fSAndy Grover spin_unlock_irqrestore(&udev->commands_lock, flags); 7037c9e7a6fSAndy Grover 7047c9e7a6fSAndy Grover /* 7057c9e7a6fSAndy Grover * We don't need to wakeup threads on wait_cmdr since they have their 7067c9e7a6fSAndy Grover * own timeout. 7077c9e7a6fSAndy Grover */ 7087c9e7a6fSAndy Grover } 7097c9e7a6fSAndy Grover 7107c9e7a6fSAndy Grover static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) 7117c9e7a6fSAndy Grover { 7127c9e7a6fSAndy Grover struct tcmu_hba *tcmu_hba; 7137c9e7a6fSAndy Grover 7147c9e7a6fSAndy Grover tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); 7157c9e7a6fSAndy Grover if (!tcmu_hba) 7167c9e7a6fSAndy Grover return -ENOMEM; 7177c9e7a6fSAndy Grover 7187c9e7a6fSAndy Grover tcmu_hba->host_id = host_id; 7197c9e7a6fSAndy Grover hba->hba_ptr = tcmu_hba; 7207c9e7a6fSAndy Grover 7217c9e7a6fSAndy Grover return 0; 7227c9e7a6fSAndy Grover } 7237c9e7a6fSAndy Grover 7247c9e7a6fSAndy Grover static void tcmu_detach_hba(struct se_hba *hba) 7257c9e7a6fSAndy Grover { 7267c9e7a6fSAndy Grover kfree(hba->hba_ptr); 7277c9e7a6fSAndy Grover hba->hba_ptr = NULL; 7287c9e7a6fSAndy Grover } 7297c9e7a6fSAndy Grover 7307c9e7a6fSAndy Grover static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) 7317c9e7a6fSAndy Grover { 7327c9e7a6fSAndy Grover struct tcmu_dev *udev; 7337c9e7a6fSAndy Grover 7347c9e7a6fSAndy Grover udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); 7357c9e7a6fSAndy Grover if (!udev) 7367c9e7a6fSAndy Grover return NULL; 7377c9e7a6fSAndy Grover 7387c9e7a6fSAndy Grover udev->name = kstrdup(name, GFP_KERNEL); 7397c9e7a6fSAndy Grover if (!udev->name) { 7407c9e7a6fSAndy Grover kfree(udev); 7417c9e7a6fSAndy Grover return NULL; 7427c9e7a6fSAndy Grover } 7437c9e7a6fSAndy Grover 7447c9e7a6fSAndy Grover udev->hba = hba; 7457c9e7a6fSAndy Grover 7467c9e7a6fSAndy Grover init_waitqueue_head(&udev->wait_cmdr); 7477c9e7a6fSAndy Grover spin_lock_init(&udev->cmdr_lock); 7487c9e7a6fSAndy Grover 7497c9e7a6fSAndy Grover idr_init(&udev->commands); 7507c9e7a6fSAndy Grover spin_lock_init(&udev->commands_lock); 7517c9e7a6fSAndy Grover 7527c9e7a6fSAndy Grover setup_timer(&udev->timeout, tcmu_device_timedout, 7537c9e7a6fSAndy Grover (unsigned long)udev); 7547c9e7a6fSAndy Grover 7557c9e7a6fSAndy Grover return &udev->se_dev; 7567c9e7a6fSAndy Grover } 7577c9e7a6fSAndy Grover 7587c9e7a6fSAndy Grover static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) 7597c9e7a6fSAndy Grover { 7607c9e7a6fSAndy Grover struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); 7617c9e7a6fSAndy Grover 7627c9e7a6fSAndy Grover tcmu_handle_completions(tcmu_dev); 7637c9e7a6fSAndy Grover 7647c9e7a6fSAndy Grover return 0; 7657c9e7a6fSAndy Grover } 7667c9e7a6fSAndy Grover 7677c9e7a6fSAndy Grover /* 7687c9e7a6fSAndy Grover * mmap code from uio.c. Copied here because we want to hook mmap() 7697c9e7a6fSAndy Grover * and this stuff must come along. 7707c9e7a6fSAndy Grover */ 7717c9e7a6fSAndy Grover static int tcmu_find_mem_index(struct vm_area_struct *vma) 7727c9e7a6fSAndy Grover { 7737c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7747c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7757c9e7a6fSAndy Grover 7767c9e7a6fSAndy Grover if (vma->vm_pgoff < MAX_UIO_MAPS) { 7777c9e7a6fSAndy Grover if (info->mem[vma->vm_pgoff].size == 0) 7787c9e7a6fSAndy Grover return -1; 7797c9e7a6fSAndy Grover return (int)vma->vm_pgoff; 7807c9e7a6fSAndy Grover } 7817c9e7a6fSAndy Grover return -1; 7827c9e7a6fSAndy Grover } 7837c9e7a6fSAndy Grover 7847c9e7a6fSAndy Grover static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7857c9e7a6fSAndy Grover { 7867c9e7a6fSAndy Grover struct tcmu_dev *udev = vma->vm_private_data; 7877c9e7a6fSAndy Grover struct uio_info *info = &udev->uio_info; 7887c9e7a6fSAndy Grover struct page *page; 7897c9e7a6fSAndy Grover unsigned long offset; 7907c9e7a6fSAndy Grover void *addr; 7917c9e7a6fSAndy Grover 7927c9e7a6fSAndy Grover int mi = tcmu_find_mem_index(vma); 7937c9e7a6fSAndy Grover if (mi < 0) 7947c9e7a6fSAndy Grover return VM_FAULT_SIGBUS; 7957c9e7a6fSAndy Grover 7967c9e7a6fSAndy Grover /* 7977c9e7a6fSAndy Grover * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 7987c9e7a6fSAndy Grover * to use mem[N]. 7997c9e7a6fSAndy Grover */ 8007c9e7a6fSAndy Grover offset = (vmf->pgoff - mi) << PAGE_SHIFT; 8017c9e7a6fSAndy Grover 8027c9e7a6fSAndy Grover addr = (void *)(unsigned long)info->mem[mi].addr + offset; 8037c9e7a6fSAndy Grover if (info->mem[mi].memtype == UIO_MEM_LOGICAL) 8047c9e7a6fSAndy Grover page = virt_to_page(addr); 8057c9e7a6fSAndy Grover else 8067c9e7a6fSAndy Grover page = vmalloc_to_page(addr); 8077c9e7a6fSAndy Grover get_page(page); 8087c9e7a6fSAndy Grover vmf->page = page; 8097c9e7a6fSAndy Grover return 0; 8107c9e7a6fSAndy Grover } 8117c9e7a6fSAndy Grover 8127c9e7a6fSAndy Grover static const struct vm_operations_struct tcmu_vm_ops = { 8137c9e7a6fSAndy Grover .fault = tcmu_vma_fault, 8147c9e7a6fSAndy Grover }; 8157c9e7a6fSAndy Grover 8167c9e7a6fSAndy Grover static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) 8177c9e7a6fSAndy Grover { 8187c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8197c9e7a6fSAndy Grover 8207c9e7a6fSAndy Grover vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 8217c9e7a6fSAndy Grover vma->vm_ops = &tcmu_vm_ops; 8227c9e7a6fSAndy Grover 8237c9e7a6fSAndy Grover vma->vm_private_data = udev; 8247c9e7a6fSAndy Grover 8257c9e7a6fSAndy Grover /* Ensure the mmap is exactly the right size */ 8267c9e7a6fSAndy Grover if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) 8277c9e7a6fSAndy Grover return -EINVAL; 8287c9e7a6fSAndy Grover 8297c9e7a6fSAndy Grover return 0; 8307c9e7a6fSAndy Grover } 8317c9e7a6fSAndy Grover 8327c9e7a6fSAndy Grover static int tcmu_open(struct uio_info *info, struct inode *inode) 8337c9e7a6fSAndy Grover { 8347c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8357c9e7a6fSAndy Grover 8367c9e7a6fSAndy Grover /* O_EXCL not supported for char devs, so fake it? */ 8377c9e7a6fSAndy Grover if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) 8387c9e7a6fSAndy Grover return -EBUSY; 8397c9e7a6fSAndy Grover 8407c9e7a6fSAndy Grover pr_debug("open\n"); 8417c9e7a6fSAndy Grover 8427c9e7a6fSAndy Grover return 0; 8437c9e7a6fSAndy Grover } 8447c9e7a6fSAndy Grover 8457c9e7a6fSAndy Grover static int tcmu_release(struct uio_info *info, struct inode *inode) 8467c9e7a6fSAndy Grover { 8477c9e7a6fSAndy Grover struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); 8487c9e7a6fSAndy Grover 8497c9e7a6fSAndy Grover clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); 8507c9e7a6fSAndy Grover 8517c9e7a6fSAndy Grover pr_debug("close\n"); 8527c9e7a6fSAndy Grover 8537c9e7a6fSAndy Grover return 0; 8547c9e7a6fSAndy Grover } 8557c9e7a6fSAndy Grover 8567c9e7a6fSAndy Grover static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) 8577c9e7a6fSAndy Grover { 8587c9e7a6fSAndy Grover struct sk_buff *skb; 8597c9e7a6fSAndy Grover void *msg_header; 8606e14eab9SNicholas Bellinger int ret = -ENOMEM; 8617c9e7a6fSAndy Grover 8627c9e7a6fSAndy Grover skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8637c9e7a6fSAndy Grover if (!skb) 8646e14eab9SNicholas Bellinger return ret; 8657c9e7a6fSAndy Grover 8667c9e7a6fSAndy Grover msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); 8676e14eab9SNicholas Bellinger if (!msg_header) 8686e14eab9SNicholas Bellinger goto free_skb; 8697c9e7a6fSAndy Grover 8707c9e7a6fSAndy Grover ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); 8716e14eab9SNicholas Bellinger if (ret < 0) 8726e14eab9SNicholas Bellinger goto free_skb; 8737c9e7a6fSAndy Grover 8747c9e7a6fSAndy Grover ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); 8756e14eab9SNicholas Bellinger if (ret < 0) 8766e14eab9SNicholas Bellinger goto free_skb; 8777c9e7a6fSAndy Grover 878053c095aSJohannes Berg genlmsg_end(skb, msg_header); 8797c9e7a6fSAndy Grover 88020c08b36SSheng Yang ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, 8817c9e7a6fSAndy Grover TCMU_MCGRP_CONFIG, GFP_KERNEL); 8827c9e7a6fSAndy Grover 8837c9e7a6fSAndy Grover /* We don't care if no one is listening */ 8847c9e7a6fSAndy Grover if (ret == -ESRCH) 8857c9e7a6fSAndy Grover ret = 0; 8867c9e7a6fSAndy Grover 8877c9e7a6fSAndy Grover return ret; 8886e14eab9SNicholas Bellinger free_skb: 8896e14eab9SNicholas Bellinger nlmsg_free(skb); 8906e14eab9SNicholas Bellinger return ret; 8917c9e7a6fSAndy Grover } 8927c9e7a6fSAndy Grover 8937c9e7a6fSAndy Grover static int tcmu_configure_device(struct se_device *dev) 8947c9e7a6fSAndy Grover { 8957c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 8967c9e7a6fSAndy Grover struct tcmu_hba *hba = udev->hba->hba_ptr; 8977c9e7a6fSAndy Grover struct uio_info *info; 8987c9e7a6fSAndy Grover struct tcmu_mailbox *mb; 8997c9e7a6fSAndy Grover size_t size; 9007c9e7a6fSAndy Grover size_t used; 9017c9e7a6fSAndy Grover int ret = 0; 9027c9e7a6fSAndy Grover char *str; 9037c9e7a6fSAndy Grover 9047c9e7a6fSAndy Grover info = &udev->uio_info; 9057c9e7a6fSAndy Grover 9067c9e7a6fSAndy Grover size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, 9077c9e7a6fSAndy Grover udev->dev_config); 9087c9e7a6fSAndy Grover size += 1; /* for \0 */ 9097c9e7a6fSAndy Grover str = kmalloc(size, GFP_KERNEL); 9107c9e7a6fSAndy Grover if (!str) 9117c9e7a6fSAndy Grover return -ENOMEM; 9127c9e7a6fSAndy Grover 9137c9e7a6fSAndy Grover used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); 9147c9e7a6fSAndy Grover 9157c9e7a6fSAndy Grover if (udev->dev_config[0]) 9167c9e7a6fSAndy Grover snprintf(str + used, size - used, "/%s", udev->dev_config); 9177c9e7a6fSAndy Grover 9187c9e7a6fSAndy Grover info->name = str; 9197c9e7a6fSAndy Grover 9207c9e7a6fSAndy Grover udev->mb_addr = vzalloc(TCMU_RING_SIZE); 9217c9e7a6fSAndy Grover if (!udev->mb_addr) { 9227c9e7a6fSAndy Grover ret = -ENOMEM; 9237c9e7a6fSAndy Grover goto err_vzalloc; 9247c9e7a6fSAndy Grover } 9257c9e7a6fSAndy Grover 9267c9e7a6fSAndy Grover /* mailbox fits in first part of CMDR space */ 9277c9e7a6fSAndy Grover udev->cmdr_size = CMDR_SIZE - CMDR_OFF; 9287c9e7a6fSAndy Grover udev->data_off = CMDR_SIZE; 9297c9e7a6fSAndy Grover udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; 9307c9e7a6fSAndy Grover 9317c9e7a6fSAndy Grover mb = udev->mb_addr; 9320ad46af8SAndy Grover mb->version = TCMU_MAILBOX_VERSION; 93332c76de3SSheng Yang mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; 9347c9e7a6fSAndy Grover mb->cmdr_off = CMDR_OFF; 9357c9e7a6fSAndy Grover mb->cmdr_size = udev->cmdr_size; 9367c9e7a6fSAndy Grover 9377c9e7a6fSAndy Grover WARN_ON(!PAGE_ALIGNED(udev->data_off)); 9387c9e7a6fSAndy Grover WARN_ON(udev->data_size % PAGE_SIZE); 93926418649SSheng Yang WARN_ON(udev->data_size % DATA_BLOCK_SIZE); 9407c9e7a6fSAndy Grover 941ac64a2ceSDavid Disseldorp info->version = __stringify(TCMU_MAILBOX_VERSION); 9427c9e7a6fSAndy Grover 9437c9e7a6fSAndy Grover info->mem[0].name = "tcm-user command & data buffer"; 9440633e123SArnd Bergmann info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; 9457c9e7a6fSAndy Grover info->mem[0].size = TCMU_RING_SIZE; 9467c9e7a6fSAndy Grover info->mem[0].memtype = UIO_MEM_VIRTUAL; 9477c9e7a6fSAndy Grover 9487c9e7a6fSAndy Grover info->irqcontrol = tcmu_irqcontrol; 9497c9e7a6fSAndy Grover info->irq = UIO_IRQ_CUSTOM; 9507c9e7a6fSAndy Grover 9517c9e7a6fSAndy Grover info->mmap = tcmu_mmap; 9527c9e7a6fSAndy Grover info->open = tcmu_open; 9537c9e7a6fSAndy Grover info->release = tcmu_release; 9547c9e7a6fSAndy Grover 9557c9e7a6fSAndy Grover ret = uio_register_device(tcmu_root_device, info); 9567c9e7a6fSAndy Grover if (ret) 9577c9e7a6fSAndy Grover goto err_register; 9587c9e7a6fSAndy Grover 95981ee28deSSheng Yang /* User can set hw_block_size before enable the device */ 96081ee28deSSheng Yang if (dev->dev_attrib.hw_block_size == 0) 9617c9e7a6fSAndy Grover dev->dev_attrib.hw_block_size = 512; 96281ee28deSSheng Yang /* Other attributes can be configured in userspace */ 9637c9e7a6fSAndy Grover dev->dev_attrib.hw_max_sectors = 128; 9647c9e7a6fSAndy Grover dev->dev_attrib.hw_queue_depth = 128; 9657c9e7a6fSAndy Grover 9667c9e7a6fSAndy Grover ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, 9677c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 9687c9e7a6fSAndy Grover if (ret) 9697c9e7a6fSAndy Grover goto err_netlink; 9707c9e7a6fSAndy Grover 9717c9e7a6fSAndy Grover return 0; 9727c9e7a6fSAndy Grover 9737c9e7a6fSAndy Grover err_netlink: 9747c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 9757c9e7a6fSAndy Grover err_register: 9767c9e7a6fSAndy Grover vfree(udev->mb_addr); 9777c9e7a6fSAndy Grover err_vzalloc: 9787c9e7a6fSAndy Grover kfree(info->name); 9797c9e7a6fSAndy Grover 9807c9e7a6fSAndy Grover return ret; 9817c9e7a6fSAndy Grover } 9827c9e7a6fSAndy Grover 983b25c7863SSheng Yang static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) 9847c9e7a6fSAndy Grover { 985b25c7863SSheng Yang if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { 986b25c7863SSheng Yang kmem_cache_free(tcmu_cmd_cache, cmd); 9877c9e7a6fSAndy Grover return 0; 988b25c7863SSheng Yang } 9897c9e7a6fSAndy Grover return -EINVAL; 9907c9e7a6fSAndy Grover } 9917c9e7a6fSAndy Grover 9924cc987eaSNicholas Bellinger static void tcmu_dev_call_rcu(struct rcu_head *p) 9934cc987eaSNicholas Bellinger { 9944cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 9954cc987eaSNicholas Bellinger struct tcmu_dev *udev = TCMU_DEV(dev); 9964cc987eaSNicholas Bellinger 9974cc987eaSNicholas Bellinger kfree(udev); 9984cc987eaSNicholas Bellinger } 9994cc987eaSNicholas Bellinger 10007c9e7a6fSAndy Grover static void tcmu_free_device(struct se_device *dev) 10017c9e7a6fSAndy Grover { 10027c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 1003b25c7863SSheng Yang struct tcmu_cmd *cmd; 1004b25c7863SSheng Yang bool all_expired = true; 10057c9e7a6fSAndy Grover int i; 10067c9e7a6fSAndy Grover 10077c9e7a6fSAndy Grover del_timer_sync(&udev->timeout); 10087c9e7a6fSAndy Grover 10097c9e7a6fSAndy Grover vfree(udev->mb_addr); 10107c9e7a6fSAndy Grover 10117c9e7a6fSAndy Grover /* Upper layer should drain all requests before calling this */ 10127c9e7a6fSAndy Grover spin_lock_irq(&udev->commands_lock); 1013b25c7863SSheng Yang idr_for_each_entry(&udev->commands, cmd, i) { 1014b25c7863SSheng Yang if (tcmu_check_and_free_pending_cmd(cmd) != 0) 1015b25c7863SSheng Yang all_expired = false; 1016b25c7863SSheng Yang } 10177c9e7a6fSAndy Grover idr_destroy(&udev->commands); 10187c9e7a6fSAndy Grover spin_unlock_irq(&udev->commands_lock); 1019b25c7863SSheng Yang WARN_ON(!all_expired); 10207c9e7a6fSAndy Grover 10217c9e7a6fSAndy Grover /* Device was configured */ 10227c9e7a6fSAndy Grover if (udev->uio_info.uio_dev) { 10237c9e7a6fSAndy Grover tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, 10247c9e7a6fSAndy Grover udev->uio_info.uio_dev->minor); 10257c9e7a6fSAndy Grover 10267c9e7a6fSAndy Grover uio_unregister_device(&udev->uio_info); 10277c9e7a6fSAndy Grover kfree(udev->uio_info.name); 10287c9e7a6fSAndy Grover kfree(udev->name); 10297c9e7a6fSAndy Grover } 10304cc987eaSNicholas Bellinger call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); 10317c9e7a6fSAndy Grover } 10327c9e7a6fSAndy Grover 10337c9e7a6fSAndy Grover enum { 10349c1cd1b6SAndy Grover Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, 10357c9e7a6fSAndy Grover }; 10367c9e7a6fSAndy Grover 10377c9e7a6fSAndy Grover static match_table_t tokens = { 10387c9e7a6fSAndy Grover {Opt_dev_config, "dev_config=%s"}, 10397c9e7a6fSAndy Grover {Opt_dev_size, "dev_size=%u"}, 10409c1cd1b6SAndy Grover {Opt_hw_block_size, "hw_block_size=%u"}, 10417c9e7a6fSAndy Grover {Opt_err, NULL} 10427c9e7a6fSAndy Grover }; 10437c9e7a6fSAndy Grover 10447c9e7a6fSAndy Grover static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, 10457c9e7a6fSAndy Grover const char *page, ssize_t count) 10467c9e7a6fSAndy Grover { 10477c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 10487c9e7a6fSAndy Grover char *orig, *ptr, *opts, *arg_p; 10497c9e7a6fSAndy Grover substring_t args[MAX_OPT_ARGS]; 10507c9e7a6fSAndy Grover int ret = 0, token; 10519c1cd1b6SAndy Grover unsigned long tmp_ul; 10527c9e7a6fSAndy Grover 10537c9e7a6fSAndy Grover opts = kstrdup(page, GFP_KERNEL); 10547c9e7a6fSAndy Grover if (!opts) 10557c9e7a6fSAndy Grover return -ENOMEM; 10567c9e7a6fSAndy Grover 10577c9e7a6fSAndy Grover orig = opts; 10587c9e7a6fSAndy Grover 10597c9e7a6fSAndy Grover while ((ptr = strsep(&opts, ",\n")) != NULL) { 10607c9e7a6fSAndy Grover if (!*ptr) 10617c9e7a6fSAndy Grover continue; 10627c9e7a6fSAndy Grover 10637c9e7a6fSAndy Grover token = match_token(ptr, tokens, args); 10647c9e7a6fSAndy Grover switch (token) { 10657c9e7a6fSAndy Grover case Opt_dev_config: 10667c9e7a6fSAndy Grover if (match_strlcpy(udev->dev_config, &args[0], 10677c9e7a6fSAndy Grover TCMU_CONFIG_LEN) == 0) { 10687c9e7a6fSAndy Grover ret = -EINVAL; 10697c9e7a6fSAndy Grover break; 10707c9e7a6fSAndy Grover } 10717c9e7a6fSAndy Grover pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); 10727c9e7a6fSAndy Grover break; 10737c9e7a6fSAndy Grover case Opt_dev_size: 10747c9e7a6fSAndy Grover arg_p = match_strdup(&args[0]); 10757c9e7a6fSAndy Grover if (!arg_p) { 10767c9e7a6fSAndy Grover ret = -ENOMEM; 10777c9e7a6fSAndy Grover break; 10787c9e7a6fSAndy Grover } 10797c9e7a6fSAndy Grover ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); 10807c9e7a6fSAndy Grover kfree(arg_p); 10817c9e7a6fSAndy Grover if (ret < 0) 10827c9e7a6fSAndy Grover pr_err("kstrtoul() failed for dev_size=\n"); 10837c9e7a6fSAndy Grover break; 10849c1cd1b6SAndy Grover case Opt_hw_block_size: 10859c1cd1b6SAndy Grover arg_p = match_strdup(&args[0]); 10869c1cd1b6SAndy Grover if (!arg_p) { 10879c1cd1b6SAndy Grover ret = -ENOMEM; 10889c1cd1b6SAndy Grover break; 10899c1cd1b6SAndy Grover } 10909c1cd1b6SAndy Grover ret = kstrtoul(arg_p, 0, &tmp_ul); 10919c1cd1b6SAndy Grover kfree(arg_p); 10929c1cd1b6SAndy Grover if (ret < 0) { 10939c1cd1b6SAndy Grover pr_err("kstrtoul() failed for hw_block_size=\n"); 10949c1cd1b6SAndy Grover break; 10959c1cd1b6SAndy Grover } 10969c1cd1b6SAndy Grover if (!tmp_ul) { 10979c1cd1b6SAndy Grover pr_err("hw_block_size must be nonzero\n"); 10989c1cd1b6SAndy Grover break; 10999c1cd1b6SAndy Grover } 11009c1cd1b6SAndy Grover dev->dev_attrib.hw_block_size = tmp_ul; 11019c1cd1b6SAndy Grover break; 11027c9e7a6fSAndy Grover default: 11037c9e7a6fSAndy Grover break; 11047c9e7a6fSAndy Grover } 11057c9e7a6fSAndy Grover } 11067c9e7a6fSAndy Grover 11077c9e7a6fSAndy Grover kfree(orig); 11087c9e7a6fSAndy Grover return (!ret) ? count : ret; 11097c9e7a6fSAndy Grover } 11107c9e7a6fSAndy Grover 11117c9e7a6fSAndy Grover static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) 11127c9e7a6fSAndy Grover { 11137c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 11147c9e7a6fSAndy Grover ssize_t bl = 0; 11157c9e7a6fSAndy Grover 11167c9e7a6fSAndy Grover bl = sprintf(b + bl, "Config: %s ", 11177c9e7a6fSAndy Grover udev->dev_config[0] ? udev->dev_config : "NULL"); 11188ee83a74SAndy Grover bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); 11197c9e7a6fSAndy Grover 11207c9e7a6fSAndy Grover return bl; 11217c9e7a6fSAndy Grover } 11227c9e7a6fSAndy Grover 11237c9e7a6fSAndy Grover static sector_t tcmu_get_blocks(struct se_device *dev) 11247c9e7a6fSAndy Grover { 11257c9e7a6fSAndy Grover struct tcmu_dev *udev = TCMU_DEV(dev); 11267c9e7a6fSAndy Grover 11277c9e7a6fSAndy Grover return div_u64(udev->dev_size - dev->dev_attrib.block_size, 11287c9e7a6fSAndy Grover dev->dev_attrib.block_size); 11297c9e7a6fSAndy Grover } 11307c9e7a6fSAndy Grover 11317c9e7a6fSAndy Grover static sense_reason_t 11327c9e7a6fSAndy Grover tcmu_pass_op(struct se_cmd *se_cmd) 11337c9e7a6fSAndy Grover { 11347c9e7a6fSAndy Grover int ret = tcmu_queue_cmd(se_cmd); 11357c9e7a6fSAndy Grover 11367c9e7a6fSAndy Grover if (ret != 0) 11377c9e7a6fSAndy Grover return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 11387c9e7a6fSAndy Grover else 11397c9e7a6fSAndy Grover return TCM_NO_SENSE; 11407c9e7a6fSAndy Grover } 11417c9e7a6fSAndy Grover 11427c9e7a6fSAndy Grover static sense_reason_t 11437c9e7a6fSAndy Grover tcmu_parse_cdb(struct se_cmd *cmd) 11447c9e7a6fSAndy Grover { 11457bfea53bSAndy Grover return passthrough_parse_cdb(cmd, tcmu_pass_op); 11469c1cd1b6SAndy Grover } 11479c1cd1b6SAndy Grover 11480a06d430SChristoph Hellwig static const struct target_backend_ops tcmu_ops = { 11497c9e7a6fSAndy Grover .name = "user", 11507c9e7a6fSAndy Grover .owner = THIS_MODULE, 1151a3541703SAndy Grover .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 11527c9e7a6fSAndy Grover .attach_hba = tcmu_attach_hba, 11537c9e7a6fSAndy Grover .detach_hba = tcmu_detach_hba, 11547c9e7a6fSAndy Grover .alloc_device = tcmu_alloc_device, 11557c9e7a6fSAndy Grover .configure_device = tcmu_configure_device, 11567c9e7a6fSAndy Grover .free_device = tcmu_free_device, 11577c9e7a6fSAndy Grover .parse_cdb = tcmu_parse_cdb, 11587c9e7a6fSAndy Grover .set_configfs_dev_params = tcmu_set_configfs_dev_params, 11597c9e7a6fSAndy Grover .show_configfs_dev_params = tcmu_show_configfs_dev_params, 11607c9e7a6fSAndy Grover .get_device_type = sbc_get_device_type, 11617c9e7a6fSAndy Grover .get_blocks = tcmu_get_blocks, 11625873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = passthrough_attrib_attrs, 11637c9e7a6fSAndy Grover }; 11647c9e7a6fSAndy Grover 11657c9e7a6fSAndy Grover static int __init tcmu_module_init(void) 11667c9e7a6fSAndy Grover { 11677c9e7a6fSAndy Grover int ret; 11687c9e7a6fSAndy Grover 11697c9e7a6fSAndy Grover BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); 11707c9e7a6fSAndy Grover 11717c9e7a6fSAndy Grover tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", 11727c9e7a6fSAndy Grover sizeof(struct tcmu_cmd), 11737c9e7a6fSAndy Grover __alignof__(struct tcmu_cmd), 11747c9e7a6fSAndy Grover 0, NULL); 11757c9e7a6fSAndy Grover if (!tcmu_cmd_cache) 11767c9e7a6fSAndy Grover return -ENOMEM; 11777c9e7a6fSAndy Grover 11787c9e7a6fSAndy Grover tcmu_root_device = root_device_register("tcm_user"); 11797c9e7a6fSAndy Grover if (IS_ERR(tcmu_root_device)) { 11807c9e7a6fSAndy Grover ret = PTR_ERR(tcmu_root_device); 11817c9e7a6fSAndy Grover goto out_free_cache; 11827c9e7a6fSAndy Grover } 11837c9e7a6fSAndy Grover 11847c9e7a6fSAndy Grover ret = genl_register_family(&tcmu_genl_family); 11857c9e7a6fSAndy Grover if (ret < 0) { 11867c9e7a6fSAndy Grover goto out_unreg_device; 11877c9e7a6fSAndy Grover } 11887c9e7a6fSAndy Grover 11890a06d430SChristoph Hellwig ret = transport_backend_register(&tcmu_ops); 11907c9e7a6fSAndy Grover if (ret) 11917c9e7a6fSAndy Grover goto out_unreg_genl; 11927c9e7a6fSAndy Grover 11937c9e7a6fSAndy Grover return 0; 11947c9e7a6fSAndy Grover 11957c9e7a6fSAndy Grover out_unreg_genl: 11967c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 11977c9e7a6fSAndy Grover out_unreg_device: 11987c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 11997c9e7a6fSAndy Grover out_free_cache: 12007c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 12017c9e7a6fSAndy Grover 12027c9e7a6fSAndy Grover return ret; 12037c9e7a6fSAndy Grover } 12047c9e7a6fSAndy Grover 12057c9e7a6fSAndy Grover static void __exit tcmu_module_exit(void) 12067c9e7a6fSAndy Grover { 12070a06d430SChristoph Hellwig target_backend_unregister(&tcmu_ops); 12087c9e7a6fSAndy Grover genl_unregister_family(&tcmu_genl_family); 12097c9e7a6fSAndy Grover root_device_unregister(tcmu_root_device); 12107c9e7a6fSAndy Grover kmem_cache_destroy(tcmu_cmd_cache); 12117c9e7a6fSAndy Grover } 12127c9e7a6fSAndy Grover 12137c9e7a6fSAndy Grover MODULE_DESCRIPTION("TCM USER subsystem plugin"); 12147c9e7a6fSAndy Grover MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); 12157c9e7a6fSAndy Grover MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); 12167c9e7a6fSAndy Grover MODULE_LICENSE("GPL"); 12177c9e7a6fSAndy Grover 12187c9e7a6fSAndy Grover module_init(tcmu_module_init); 12197c9e7a6fSAndy Grover module_exit(tcmu_module_exit); 1220