1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 5 #include <linux/file.h> 6 #include <linux/proc_fs.h> 7 #include <linux/seq_file.h> 8 #include <linux/io_uring.h> 9 10 #include <uapi/linux/io_uring.h> 11 12 #include "filetable.h" 13 #include "sqpoll.h" 14 #include "fdinfo.h" 15 #include "cancel.h" 16 #include "rsrc.h" 17 18 #ifdef CONFIG_NET_RX_BUSY_POLL 19 static __cold void common_tracking_show_fdinfo(struct io_ring_ctx *ctx, 20 struct seq_file *m, 21 const char *tracking_strategy) 22 { 23 seq_puts(m, "NAPI:\tenabled\n"); 24 seq_printf(m, "napi tracking:\t%s\n", tracking_strategy); 25 seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt); 26 if (ctx->napi_prefer_busy_poll) 27 seq_puts(m, "napi_prefer_busy_poll:\ttrue\n"); 28 else 29 seq_puts(m, "napi_prefer_busy_poll:\tfalse\n"); 30 } 31 32 static __cold void napi_show_fdinfo(struct io_ring_ctx *ctx, 33 struct seq_file *m) 34 { 35 unsigned int mode = READ_ONCE(ctx->napi_track_mode); 36 37 switch (mode) { 38 case IO_URING_NAPI_TRACKING_INACTIVE: 39 seq_puts(m, "NAPI:\tdisabled\n"); 40 break; 41 case IO_URING_NAPI_TRACKING_DYNAMIC: 42 common_tracking_show_fdinfo(ctx, m, "dynamic"); 43 break; 44 case IO_URING_NAPI_TRACKING_STATIC: 45 common_tracking_show_fdinfo(ctx, m, "static"); 46 break; 47 default: 48 seq_printf(m, "NAPI:\tunknown mode (%u)\n", mode); 49 } 50 } 51 #else 52 static inline void napi_show_fdinfo(struct io_ring_ctx *ctx, 53 struct seq_file *m) 54 { 55 } 56 #endif 57 58 static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) 59 { 60 struct io_overflow_cqe *ocqe; 61 struct io_rings *r = ctx->rings; 62 unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; 63 unsigned int sq_head = READ_ONCE(r->sq.head); 64 unsigned int sq_tail = READ_ONCE(r->sq.tail); 65 unsigned int cq_head = READ_ONCE(r->cq.head); 66 unsigned int cq_tail = READ_ONCE(r->cq.tail); 67 unsigned int sq_shift = 0; 68 unsigned int sq_entries; 69 int sq_pid = -1, sq_cpu = -1; 70 u64 sq_total_time = 0, sq_work_time = 0; 71 unsigned int i; 72 73 if (ctx->flags & IORING_SETUP_SQE128) 74 sq_shift = 1; 75 76 /* 77 * we may get imprecise sqe and cqe info if uring is actively running 78 * since we get cached_sq_head and cached_cq_tail without uring_lock 79 * and sq_tail and cq_head are changed by userspace. But it's ok since 80 * we usually use these info when it is stuck. 81 */ 82 seq_printf(m, "SqMask:\t0x%x\n", sq_mask); 83 seq_printf(m, "SqHead:\t%u\n", sq_head); 84 seq_printf(m, "SqTail:\t%u\n", sq_tail); 85 seq_printf(m, "CachedSqHead:\t%u\n", data_race(ctx->cached_sq_head)); 86 seq_printf(m, "CqMask:\t0x%x\n", cq_mask); 87 seq_printf(m, "CqHead:\t%u\n", cq_head); 88 seq_printf(m, "CqTail:\t%u\n", cq_tail); 89 seq_printf(m, "CachedCqTail:\t%u\n", data_race(ctx->cached_cq_tail)); 90 seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head); 91 sq_entries = min(sq_tail - sq_head, ctx->sq_entries); 92 for (i = 0; i < sq_entries; i++) { 93 unsigned int entry = i + sq_head; 94 struct io_uring_sqe *sqe; 95 unsigned int sq_idx; 96 97 if (ctx->flags & IORING_SETUP_NO_SQARRAY) 98 break; 99 sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); 100 if (sq_idx > sq_mask) 101 continue; 102 sqe = &ctx->sq_sqes[sq_idx << sq_shift]; 103 seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, " 104 "addr:0x%llx, rw_flags:0x%x, buf_index:%d " 105 "user_data:%llu", 106 sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd, 107 sqe->flags, (unsigned long long) sqe->off, 108 (unsigned long long) sqe->addr, sqe->rw_flags, 109 sqe->buf_index, sqe->user_data); 110 if (sq_shift) { 111 u64 *sqeb = (void *) (sqe + 1); 112 int size = sizeof(struct io_uring_sqe) / sizeof(u64); 113 int j; 114 115 for (j = 0; j < size; j++) { 116 seq_printf(m, ", e%d:0x%llx", j, 117 (unsigned long long) *sqeb); 118 sqeb++; 119 } 120 } 121 seq_printf(m, "\n"); 122 } 123 seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); 124 while (cq_head < cq_tail) { 125 struct io_uring_cqe *cqe; 126 bool cqe32 = false; 127 128 cqe = &r->cqes[(cq_head & cq_mask)]; 129 if (cqe->flags & IORING_CQE_F_32 || ctx->flags & IORING_SETUP_CQE32) 130 cqe32 = true; 131 seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x", 132 cq_head & cq_mask, cqe->user_data, cqe->res, 133 cqe->flags); 134 if (cqe32) 135 seq_printf(m, ", extra1:%llu, extra2:%llu\n", 136 cqe->big_cqe[0], cqe->big_cqe[1]); 137 seq_printf(m, "\n"); 138 cq_head++; 139 if (cqe32) 140 cq_head++; 141 } 142 143 if (ctx->flags & IORING_SETUP_SQPOLL) { 144 struct io_sq_data *sq = ctx->sq_data; 145 struct task_struct *tsk; 146 147 rcu_read_lock(); 148 tsk = rcu_dereference(sq->thread); 149 /* 150 * sq->thread might be NULL if we raced with the sqpoll 151 * thread termination. 152 */ 153 if (tsk) { 154 u64 usec; 155 156 get_task_struct(tsk); 157 rcu_read_unlock(); 158 usec = io_sq_cpu_usec(tsk); 159 put_task_struct(tsk); 160 sq_pid = sq->task_pid; 161 sq_cpu = sq->sq_cpu; 162 sq_total_time = usec; 163 sq_work_time = sq->work_time; 164 } else { 165 rcu_read_unlock(); 166 } 167 } 168 169 seq_printf(m, "SqThread:\t%d\n", sq_pid); 170 seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); 171 seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time); 172 seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time); 173 seq_printf(m, "UserFiles:\t%u\n", ctx->file_table.data.nr); 174 for (i = 0; i < ctx->file_table.data.nr; i++) { 175 struct file *f = NULL; 176 177 if (ctx->file_table.data.nodes[i]) 178 f = io_slot_file(ctx->file_table.data.nodes[i]); 179 if (f) { 180 seq_printf(m, "%5u: ", i); 181 seq_file_path(m, f, " \t\n\\"); 182 seq_puts(m, "\n"); 183 } 184 } 185 seq_printf(m, "UserBufs:\t%u\n", ctx->buf_table.nr); 186 for (i = 0; i < ctx->buf_table.nr; i++) { 187 struct io_mapped_ubuf *buf = NULL; 188 189 if (ctx->buf_table.nodes[i]) 190 buf = ctx->buf_table.nodes[i]->buf; 191 if (buf) 192 seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, buf->len); 193 else 194 seq_printf(m, "%5u: <none>\n", i); 195 } 196 197 seq_puts(m, "PollList:\n"); 198 for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) { 199 struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i]; 200 struct io_kiocb *req; 201 202 hlist_for_each_entry(req, &hb->list, hash_node) 203 seq_printf(m, " op=%d, task_works=%d\n", req->opcode, 204 task_work_pending(req->tctx->task)); 205 } 206 207 seq_puts(m, "CqOverflowList:\n"); 208 spin_lock(&ctx->completion_lock); 209 list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { 210 struct io_uring_cqe *cqe = &ocqe->cqe; 211 212 seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", 213 cqe->user_data, cqe->res, cqe->flags); 214 215 } 216 spin_unlock(&ctx->completion_lock); 217 napi_show_fdinfo(ctx, m); 218 } 219 220 /* 221 * Caller holds a reference to the file already, we don't need to do 222 * anything else to get an extra reference. 223 */ 224 __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file) 225 { 226 struct io_ring_ctx *ctx = file->private_data; 227 228 /* 229 * Avoid ABBA deadlock between the seq lock and the io_uring mutex, 230 * since fdinfo case grabs it in the opposite direction of normal use 231 * cases. 232 */ 233 if (mutex_trylock(&ctx->uring_lock)) { 234 __io_uring_show_fdinfo(ctx, m); 235 mutex_unlock(&ctx->uring_lock); 236 } 237 } 238