interconnect: qcom: icc-rpm: Fix peak rate calculation
[linux-2.6-microblaze.git] / io_uring / fdinfo.c
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 /*
50  * Caller holds a reference to the file already, we don't need to do
51  * anything else to get an extra reference.
52  */
53 __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
54 {
55         struct io_ring_ctx *ctx = f->private_data;
56         struct io_overflow_cqe *ocqe;
57         struct io_rings *r = ctx->rings;
58         unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
59         unsigned int sq_head = READ_ONCE(r->sq.head);
60         unsigned int sq_tail = READ_ONCE(r->sq.tail);
61         unsigned int cq_head = READ_ONCE(r->cq.head);
62         unsigned int cq_tail = READ_ONCE(r->cq.tail);
63         unsigned int cq_shift = 0;
64         unsigned int sq_shift = 0;
65         unsigned int sq_entries, cq_entries;
66         int sq_pid = -1, sq_cpu = -1;
67         bool has_lock;
68         unsigned int i;
69
70         if (ctx->flags & IORING_SETUP_CQE32)
71                 cq_shift = 1;
72         if (ctx->flags & IORING_SETUP_SQE128)
73                 sq_shift = 1;
74
75         /*
76          * we may get imprecise sqe and cqe info if uring is actively running
77          * since we get cached_sq_head and cached_cq_tail without uring_lock
78          * and sq_tail and cq_head are changed by userspace. But it's ok since
79          * we usually use these info when it is stuck.
80          */
81         seq_printf(m, "SqMask:\t0x%x\n", sq_mask);
82         seq_printf(m, "SqHead:\t%u\n", sq_head);
83         seq_printf(m, "SqTail:\t%u\n", sq_tail);
84         seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);
85         seq_printf(m, "CqMask:\t0x%x\n", cq_mask);
86         seq_printf(m, "CqHead:\t%u\n", cq_head);
87         seq_printf(m, "CqTail:\t%u\n", cq_tail);
88         seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
89         seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head);
90         sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
91         for (i = 0; i < sq_entries; i++) {
92                 unsigned int entry = i + sq_head;
93                 struct io_uring_sqe *sqe;
94                 unsigned int sq_idx;
95
96                 if (ctx->flags & IORING_SETUP_NO_SQARRAY)
97                         break;
98                 sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
99                 if (sq_idx > sq_mask)
100                         continue;
101                 sqe = &ctx->sq_sqes[sq_idx << sq_shift];
102                 seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "
103                               "addr:0x%llx, rw_flags:0x%x, buf_index:%d "
104                               "user_data:%llu",
105                            sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd,
106                            sqe->flags, (unsigned long long) sqe->off,
107                            (unsigned long long) sqe->addr, sqe->rw_flags,
108                            sqe->buf_index, sqe->user_data);
109                 if (sq_shift) {
110                         u64 *sqeb = (void *) (sqe + 1);
111                         int size = sizeof(struct io_uring_sqe) / sizeof(u64);
112                         int j;
113
114                         for (j = 0; j < size; j++) {
115                                 seq_printf(m, ", e%d:0x%llx", j,
116                                                 (unsigned long long) *sqeb);
117                                 sqeb++;
118                         }
119                 }
120                 seq_printf(m, "\n");
121         }
122         seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);
123         cq_entries = min(cq_tail - cq_head, ctx->cq_entries);
124         for (i = 0; i < cq_entries; i++) {
125                 unsigned int entry = i + cq_head;
126                 struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];
127
128                 seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x",
129                            entry & cq_mask, cqe->user_data, cqe->res,
130                            cqe->flags);
131                 if (cq_shift)
132                         seq_printf(m, ", extra1:%llu, extra2:%llu\n",
133                                         cqe->big_cqe[0], cqe->big_cqe[1]);
134                 seq_printf(m, "\n");
135         }
136
137         /*
138          * Avoid ABBA deadlock between the seq lock and the io_uring mutex,
139          * since fdinfo case grabs it in the opposite direction of normal use
140          * cases. If we fail to get the lock, we just don't iterate any
141          * structures that could be going away outside the io_uring mutex.
142          */
143         has_lock = mutex_trylock(&ctx->uring_lock);
144
145         if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {
146                 struct io_sq_data *sq = ctx->sq_data;
147
148                 if (mutex_trylock(&sq->lock)) {
149                         if (sq->thread) {
150                                 sq_pid = task_pid_nr(sq->thread);
151                                 sq_cpu = task_cpu(sq->thread);
152                         }
153                         mutex_unlock(&sq->lock);
154                 }
155         }
156
157         seq_printf(m, "SqThread:\t%d\n", sq_pid);
158         seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu);
159         seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
160         for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
161                 struct file *f = io_file_from_index(&ctx->file_table, i);
162
163                 if (f)
164                         seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
165                 else
166                         seq_printf(m, "%5u: <none>\n", i);
167         }
168         seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
169         for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
170                 struct io_mapped_ubuf *buf = ctx->user_bufs[i];
171                 unsigned int len = buf->ubuf_end - buf->ubuf;
172
173                 seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
174         }
175         if (has_lock && !xa_empty(&ctx->personalities)) {
176                 unsigned long index;
177                 const struct cred *cred;
178
179                 seq_printf(m, "Personalities:\n");
180                 xa_for_each(&ctx->personalities, index, cred)
181                         io_uring_show_cred(m, index, cred);
182         }
183
184         seq_puts(m, "PollList:\n");
185         for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) {
186                 struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i];
187                 struct io_hash_bucket *hbl = &ctx->cancel_table_locked.hbs[i];
188                 struct io_kiocb *req;
189
190                 spin_lock(&hb->lock);
191                 hlist_for_each_entry(req, &hb->list, hash_node)
192                         seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,
193                                         task_work_pending(req->task));
194                 spin_unlock(&hb->lock);
195
196                 if (!has_lock)
197                         continue;
198                 hlist_for_each_entry(req, &hbl->list, hash_node)
199                         seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,
200                                         task_work_pending(req->task));
201         }
202
203         if (has_lock)
204                 mutex_unlock(&ctx->uring_lock);
205
206         seq_puts(m, "CqOverflowList:\n");
207         spin_lock(&ctx->completion_lock);
208         list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {
209                 struct io_uring_cqe *cqe = &ocqe->cqe;
210
211                 seq_printf(m, "  user_data=%llu, res=%d, flags=%x\n",
212                            cqe->user_data, cqe->res, cqe->flags);
213
214         }
215
216         spin_unlock(&ctx->completion_lock);
217 }
218 #endif