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 "io_uring.h" 13 #include "sqpoll.h" 14 #include "fdinfo.h" 15 #include "cancel.h" 16 #include "rsrc.h" 17 18 #ifdef CONFIG_PROC_FS 19 static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, 20 const struct cred *cred) 21 { 22 struct user_namespace *uns = seq_user_ns(m); 23 struct group_info *gi; 24 kernel_cap_t cap; 25 int g; 26 27 seq_printf(m, "%5d\n", id); 28 seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); 29 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); 30 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); 31 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); 32 seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); 33 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); 34 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); 35 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); 36 seq_puts(m, "\n\tGroups:\t"); 37 gi = cred->group_info; 38 for (g = 0; g < gi->ngroups; g++) { 39 seq_put_decimal_ull(m, g ? " " : "", 40 from_kgid_munged(uns, gi->gid[g])); 41 } 42 seq_puts(m, "\n\tCapEff:\t"); 43 cap = cred->cap_effective; 44 seq_put_hex_ll(m, NULL, cap.val, 16); 45 seq_putc(m, '\n'); 46 return 0; 47 } 48 49 #ifdef CONFIG_NET_RX_BUSY_POLL 50 static __cold void common_tracking_show_fdinfo(struct io_ring_ctx *ctx, 51 struct seq_file *m, 52 const char *tracking_strategy) 53 { 54 seq_puts(m, "NAPI:\tenabled\n"); 55 seq_printf(m, "napi tracking:\t%s\n", tracking_strategy); 56 seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt); 57 if (ctx->napi_prefer_busy_poll) 58 seq_puts(m, "napi_prefer_busy_poll:\ttrue\n"); 59 else 60 seq_puts(m, "napi_prefer_busy_poll:\tfalse\n"); 61 } 62 63 static __cold void napi_show_fdinfo(struct io_ring_ctx *ctx, 64 struct seq_file *m) 65 { 66 unsigned int mode = READ_ONCE(ctx->napi_track_mode); 67 68 switch (mode) { 69 case IO_URING_NAPI_TRACKING_INACTIVE: 70 seq_puts(m, "NAPI:\tdisabled\n"); 71 break; 72 case IO_URING_NAPI_TRACKING_DYNAMIC: 73 common_tracking_show_fdinfo(ctx, m, "dynamic"); 74 break; 75 case IO_URING_NAPI_TRACKING_STATIC: 76 common_tracking_show_fdinfo(ctx, m, "static"); 77 break; 78 default: 79 seq_printf(m, "NAPI:\tunknown mode (%u)\n", mode); 80 } 81 } 82 #else 83 static inline void napi_show_fdinfo(struct io_ring_ctx *ctx, 84 struct seq_file *m) 85 { 86 } 87 #endif 88 89 static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) 90 { 91 struct io_overflow_cqe *ocqe; 92 struct io_rings *r = ctx->rings; 93 struct rusage sq_usage; 94 unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; 95 unsigned int sq_head = READ_ONCE(r->sq.head); 96 unsigned int sq_tail = READ_ONCE(r->sq.tail); 97 unsigned int cq_head = READ_ONCE(r->cq.head); 98 unsigned int cq_tail = READ_ONCE(r->cq.tail); 99 unsigned int cq_shift = 0; 100 unsigned int sq_shift = 0; 101 unsigned int sq_entries, cq_entries; 102 int sq_pid = -1, sq_cpu = -1; 103 u64 sq_total_time = 0, sq_work_time = 0; 104 unsigned int i; 105 106 if (ctx->flags & IORING_SETUP_CQE32) 107 cq_shift = 1; 108 if (ctx->flags & IORING_SETUP_SQE128) 109 sq_shift = 1; 110 111 /* 112 * we may get imprecise sqe and cqe info if uring is actively running 113 * since we get cached_sq_head and cached_cq_tail without uring_lock 114 * and sq_tail and cq_head are changed by userspace. But it's ok since 115 * we usually use these info when it is stuck. 116 */ 117 seq_printf(m, "SqMask:\t0x%x\n", sq_mask); 118 seq_printf(m, "SqHead:\t%u\n", sq_head); 119 seq_printf(m, "SqTail:\t%u\n", sq_tail); 120 seq_printf(m, "CachedSqHead:\t%u\n", data_race(ctx->cached_sq_head)); 121 seq_printf(m, "CqMask:\t0x%x\n", cq_mask); 122 seq_printf(m, "CqHead:\t%u\n", cq_head); 123 seq_printf(m, "CqTail:\t%u\n", cq_tail); 124 seq_printf(m, "CachedCqTail:\t%u\n", data_race(ctx->cached_cq_tail)); 125 seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head); 126 sq_entries = min(sq_tail - sq_head, ctx->sq_entries); 127 for (i = 0; i < sq_entries; i++) { 128 unsigned int entry = i + sq_head; 129 struct io_uring_sqe *sqe; 130 unsigned int sq_idx; 131 132 if (ctx->flags & IORING_SETUP_NO_SQARRAY) 133 break; 134 sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); 135 if (sq_idx > sq_mask) 136 continue; 137 sqe = &ctx->sq_sqes[sq_idx << sq_shift]; 138 seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, " 139 "addr:0x%llx, rw_flags:0x%x, buf_index:%d " 140 "user_data:%llu", 141 sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd, 142 sqe->flags, (unsigned long long) sqe->off, 143 (unsigned long long) sqe->addr, sqe->rw_flags, 144 sqe->buf_index, sqe->user_data); 145 if (sq_shift) { 146 u64 *sqeb = (void *) (sqe + 1); 147 int size = sizeof(struct io_uring_sqe) / sizeof(u64); 148 int j; 149 150 for (j = 0; j < size; j++) { 151 seq_printf(m, ", e%d:0x%llx", j, 152 (unsigned long long) *sqeb); 153 sqeb++; 154 } 155 } 156 seq_printf(m, "\n"); 157 } 158 seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); 159 cq_entries = min(cq_tail - cq_head, ctx->cq_entries); 160 for (i = 0; i < cq_entries; i++) { 161 unsigned int entry = i + cq_head; 162 struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift]; 163 164 seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x", 165 entry & cq_mask, cqe->user_data, cqe->res, 166 cqe->flags); 167 if (cq_shift) 168 seq_printf(m, ", extra1:%llu, extra2:%llu\n", 169 cqe->big_cqe[0], cqe->big_cqe[1]); 170 seq_printf(m, "\n"); 171 } 172 173 if (ctx->flags & IORING_SETUP_SQPOLL) { 174 struct io_sq_data *sq = ctx->sq_data; 175 176 /* 177 * sq->thread might be NULL if we raced with the sqpoll 178 * thread termination. 179 */ 180 if (sq->thread) { 181 sq_pid = sq->task_pid; 182 sq_cpu = sq->sq_cpu; 183 getrusage(sq->thread, RUSAGE_SELF, &sq_usage); 184 sq_total_time = (sq_usage.ru_stime.tv_sec * 1000000 185 + sq_usage.ru_stime.tv_usec); 186 sq_work_time = sq->work_time; 187 } 188 } 189 190 seq_printf(m, "SqThread:\t%d\n", sq_pid); 191 seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); 192 seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time); 193 seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time); 194 seq_printf(m, "UserFiles:\t%u\n", ctx->file_table.data.nr); 195 for (i = 0; i < ctx->file_table.data.nr; i++) { 196 struct file *f = NULL; 197 198 if (ctx->file_table.data.nodes[i]) 199 f = io_slot_file(ctx->file_table.data.nodes[i]); 200 if (f) { 201 seq_printf(m, "%5u: ", i); 202 seq_file_path(m, f, " \t\n\\"); 203 seq_puts(m, "\n"); 204 } 205 } 206 seq_printf(m, "UserBufs:\t%u\n", ctx->buf_table.nr); 207 for (i = 0; i < ctx->buf_table.nr; i++) { 208 struct io_mapped_ubuf *buf = NULL; 209 210 if (ctx->buf_table.nodes[i]) 211 buf = ctx->buf_table.nodes[i]->buf; 212 if (buf) 213 seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, buf->len); 214 else 215 seq_printf(m, "%5u: <none>\n", i); 216 } 217 if (!xa_empty(&ctx->personalities)) { 218 unsigned long index; 219 const struct cred *cred; 220 221 seq_printf(m, "Personalities:\n"); 222 xa_for_each(&ctx->personalities, index, cred) 223 io_uring_show_cred(m, index, cred); 224 } 225 226 seq_puts(m, "PollList:\n"); 227 for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) { 228 struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i]; 229 struct io_kiocb *req; 230 231 hlist_for_each_entry(req, &hb->list, hash_node) 232 seq_printf(m, " op=%d, task_works=%d\n", req->opcode, 233 task_work_pending(req->tctx->task)); 234 } 235 236 seq_puts(m, "CqOverflowList:\n"); 237 spin_lock(&ctx->completion_lock); 238 list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { 239 struct io_uring_cqe *cqe = &ocqe->cqe; 240 241 seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", 242 cqe->user_data, cqe->res, cqe->flags); 243 244 } 245 spin_unlock(&ctx->completion_lock); 246 napi_show_fdinfo(ctx, m); 247 } 248 249 /* 250 * Caller holds a reference to the file already, we don't need to do 251 * anything else to get an extra reference. 252 */ 253 __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file) 254 { 255 struct io_ring_ctx *ctx = file->private_data; 256 257 /* 258 * Avoid ABBA deadlock between the seq lock and the io_uring mutex, 259 * since fdinfo case grabs it in the opposite direction of normal use 260 * cases. 261 */ 262 if (mutex_trylock(&ctx->uring_lock)) { 263 __io_uring_show_fdinfo(ctx, m); 264 mutex_unlock(&ctx->uring_lock); 265 } 266 } 267 #endif 268