1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Fault injection ublk target. Hack this up however you like for 5 * testing specific behaviors of ublk_drv. Currently is a null target 6 * with a configurable delay before completing each I/O. This delay can 7 * be used to test ublk_drv's handling of I/O outstanding to the ublk 8 * server when it dies. 9 */ 10 11 #include "kublk.h" 12 13 static int ublk_fault_inject_tgt_init(const struct dev_ctx *ctx, 14 struct ublk_dev *dev) 15 { 16 const struct ublksrv_ctrl_dev_info *info = &dev->dev_info; 17 unsigned long dev_size = 250UL << 30; 18 19 if (ctx->auto_zc_fallback) { 20 ublk_err("%s: not support auto_zc_fallback\n", __func__); 21 return -EINVAL; 22 } 23 24 dev->tgt.dev_size = dev_size; 25 dev->tgt.params = (struct ublk_params) { 26 .types = UBLK_PARAM_TYPE_BASIC, 27 .basic = { 28 .logical_bs_shift = 9, 29 .physical_bs_shift = 12, 30 .io_opt_shift = 12, 31 .io_min_shift = 9, 32 .max_sectors = info->max_io_buf_bytes >> 9, 33 .dev_sectors = dev_size >> 9, 34 }, 35 }; 36 37 dev->private_data = (void *)(unsigned long)(ctx->fault_inject.delay_us * 1000); 38 return 0; 39 } 40 41 static int ublk_fault_inject_queue_io(struct ublk_queue *q, int tag) 42 { 43 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag); 44 struct io_uring_sqe *sqe; 45 struct __kernel_timespec ts = { 46 .tv_nsec = (long long)q->dev->private_data, 47 }; 48 49 ublk_io_alloc_sqes(ublk_get_io(q, tag), &sqe, 1); 50 io_uring_prep_timeout(sqe, &ts, 1, 0); 51 sqe->user_data = build_user_data(tag, ublksrv_get_op(iod), 0, q->q_id, 1); 52 53 ublk_queued_tgt_io(q, tag, 1); 54 55 return 0; 56 } 57 58 static void ublk_fault_inject_tgt_io_done(struct ublk_queue *q, int tag, 59 const struct io_uring_cqe *cqe) 60 { 61 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag); 62 63 if (cqe->res != -ETIME) 64 ublk_err("%s: unexpected cqe res %d\n", __func__, cqe->res); 65 66 if (ublk_completed_tgt_io(q, tag)) 67 ublk_complete_io(q, tag, iod->nr_sectors << 9); 68 else 69 ublk_err("%s: io not complete after 1 cqe\n", __func__); 70 } 71 72 static void ublk_fault_inject_cmd_line(struct dev_ctx *ctx, int argc, char *argv[]) 73 { 74 static const struct option longopts[] = { 75 { "delay_us", 1, NULL, 0 }, 76 { 0, 0, 0, 0 } 77 }; 78 int option_idx, opt; 79 80 ctx->fault_inject.delay_us = 0; 81 while ((opt = getopt_long(argc, argv, "", 82 longopts, &option_idx)) != -1) { 83 switch (opt) { 84 case 0: 85 if (!strcmp(longopts[option_idx].name, "delay_us")) 86 ctx->fault_inject.delay_us = strtoll(optarg, NULL, 10); 87 } 88 } 89 } 90 91 static void ublk_fault_inject_usage(const struct ublk_tgt_ops *ops) 92 { 93 printf("\tfault_inject: [--delay_us us (default 0)]\n"); 94 } 95 96 const struct ublk_tgt_ops fault_inject_tgt_ops = { 97 .name = "fault_inject", 98 .init_tgt = ublk_fault_inject_tgt_init, 99 .queue_io = ublk_fault_inject_queue_io, 100 .tgt_io_done = ublk_fault_inject_tgt_io_done, 101 .parse_cmd_line = ublk_fault_inject_cmd_line, 102 .usage = ublk_fault_inject_usage, 103 }; 104