Merge tag 'powerpc-6.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[platform/kernel/linux-starfive.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         unsigned __capi;
26         int g;
27
28         seq_printf(m, "%5d\n", id);
29         seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
30         seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
31         seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
32         seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
33         seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
34         seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
35         seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
36         seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
37         seq_puts(m, "\n\tGroups:\t");
38         gi = cred->group_info;
39         for (g = 0; g < gi->ngroups; g++) {
40                 seq_put_decimal_ull(m, g ? " " : "",
41                                         from_kgid_munged(uns, gi->gid[g]));
42         }
43         seq_puts(m, "\n\tCapEff:\t");
44         cap = cred->cap_effective;
45         CAP_FOR_EACH_U32(__capi)
46                 seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8);
47         seq_putc(m, '\n');
48         return 0;
49 }
50
51 static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
52                                           struct seq_file *m)
53 {
54         struct io_sq_data *sq = NULL;
55         struct io_overflow_cqe *ocqe;
56         struct io_rings *r = ctx->rings;
57         unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
58         unsigned int sq_head = READ_ONCE(r->sq.head);
59         unsigned int sq_tail = READ_ONCE(r->sq.tail);
60         unsigned int cq_head = READ_ONCE(r->cq.head);
61         unsigned int cq_tail = READ_ONCE(r->cq.tail);
62         unsigned int cq_shift = 0;
63         unsigned int sq_shift = 0;
64         unsigned int sq_entries, cq_entries;
65         bool has_lock;
66         unsigned int i;
67
68         if (ctx->flags & IORING_SETUP_CQE32)
69                 cq_shift = 1;
70         if (ctx->flags & IORING_SETUP_SQE128)
71                 sq_shift = 1;
72
73         /*
74          * we may get imprecise sqe and cqe info if uring is actively running
75          * since we get cached_sq_head and cached_cq_tail without uring_lock
76          * and sq_tail and cq_head are changed by userspace. But it's ok since
77          * we usually use these info when it is stuck.
78          */
79         seq_printf(m, "SqMask:\t0x%x\n", sq_mask);
80         seq_printf(m, "SqHead:\t%u\n", sq_head);
81         seq_printf(m, "SqTail:\t%u\n", sq_tail);
82         seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);
83         seq_printf(m, "CqMask:\t0x%x\n", cq_mask);
84         seq_printf(m, "CqHead:\t%u\n", cq_head);
85         seq_printf(m, "CqTail:\t%u\n", cq_tail);
86         seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
87         seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head);
88         sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
89         for (i = 0; i < sq_entries; i++) {
90                 unsigned int entry = i + sq_head;
91                 struct io_uring_sqe *sqe;
92                 unsigned int sq_idx;
93
94                 sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
95                 if (sq_idx > sq_mask)
96                         continue;
97                 sqe = &ctx->sq_sqes[sq_idx << sq_shift];
98                 seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "
99                               "addr:0x%llx, rw_flags:0x%x, buf_index:%d "
100                               "user_data:%llu",
101                            sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd,
102                            sqe->flags, (unsigned long long) sqe->off,
103                            (unsigned long long) sqe->addr, sqe->rw_flags,
104                            sqe->buf_index, sqe->user_data);
105                 if (sq_shift) {
106                         u64 *sqeb = (void *) (sqe + 1);
107                         int size = sizeof(struct io_uring_sqe) / sizeof(u64);
108                         int j;
109
110                         for (j = 0; j < size; j++) {
111                                 seq_printf(m, ", e%d:0x%llx", j,
112                                                 (unsigned long long) *sqeb);
113                                 sqeb++;
114                         }
115                 }
116                 seq_printf(m, "\n");
117         }
118         seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);
119         cq_entries = min(cq_tail - cq_head, ctx->cq_entries);
120         for (i = 0; i < cq_entries; i++) {
121                 unsigned int entry = i + cq_head;
122                 struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];
123
124                 seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x",
125                            entry & cq_mask, cqe->user_data, cqe->res,
126                            cqe->flags);
127                 if (cq_shift)
128                         seq_printf(m, ", extra1:%llu, extra2:%llu\n",
129                                         cqe->big_cqe[0], cqe->big_cqe[1]);
130                 seq_printf(m, "\n");
131         }
132
133         /*
134          * Avoid ABBA deadlock between the seq lock and the io_uring mutex,
135          * since fdinfo case grabs it in the opposite direction of normal use
136          * cases. If we fail to get the lock, we just don't iterate any
137          * structures that could be going away outside the io_uring mutex.
138          */
139         has_lock = mutex_trylock(&ctx->uring_lock);
140
141         if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {
142                 sq = ctx->sq_data;
143                 if (!sq->thread)
144                         sq = NULL;
145         }
146
147         seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1);
148         seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
149         seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
150         for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
151                 struct file *f = io_file_from_index(&ctx->file_table, i);
152
153                 if (f)
154                         seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
155                 else
156                         seq_printf(m, "%5u: <none>\n", i);
157         }
158         seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
159         for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
160                 struct io_mapped_ubuf *buf = ctx->user_bufs[i];
161                 unsigned int len = buf->ubuf_end - buf->ubuf;
162
163                 seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
164         }
165         if (has_lock && !xa_empty(&ctx->personalities)) {
166                 unsigned long index;
167                 const struct cred *cred;
168
169                 seq_printf(m, "Personalities:\n");
170                 xa_for_each(&ctx->personalities, index, cred)
171                         io_uring_show_cred(m, index, cred);
172         }
173         if (has_lock)
174                 mutex_unlock(&ctx->uring_lock);
175
176         seq_puts(m, "PollList:\n");
177         for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) {
178                 struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i];
179                 struct io_kiocb *req;
180
181                 spin_lock(&hb->lock);
182                 hlist_for_each_entry(req, &hb->list, hash_node)
183                         seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,
184                                         task_work_pending(req->task));
185                 spin_unlock(&hb->lock);
186         }
187
188         seq_puts(m, "CqOverflowList:\n");
189         spin_lock(&ctx->completion_lock);
190         list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {
191                 struct io_uring_cqe *cqe = &ocqe->cqe;
192
193                 seq_printf(m, "  user_data=%llu, res=%d, flags=%x\n",
194                            cqe->user_data, cqe->res, cqe->flags);
195
196         }
197
198         spin_unlock(&ctx->completion_lock);
199 }
200
201 __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
202 {
203         struct io_ring_ctx *ctx = f->private_data;
204
205         if (percpu_ref_tryget(&ctx->refs)) {
206                 __io_uring_show_fdinfo(ctx, m);
207                 percpu_ref_put(&ctx->refs);
208         }
209 }
210 #endif