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1// SPDX-License-Identifier: GPL-2.02#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_FS19static __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 do51 * anything else to get an extra reference.52 */53__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)54{55	struct io_ring_ctx *ctx = file->private_data;56	struct io_overflow_cqe *ocqe;57	struct io_rings *r = ctx->rings;58	struct rusage sq_usage;59	unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;60	unsigned int sq_head = READ_ONCE(r->sq.head);61	unsigned int sq_tail = READ_ONCE(r->sq.tail);62	unsigned int cq_head = READ_ONCE(r->cq.head);63	unsigned int cq_tail = READ_ONCE(r->cq.tail);64	unsigned int cq_shift = 0;65	unsigned int sq_shift = 0;66	unsigned int sq_entries, cq_entries;67	int sq_pid = -1, sq_cpu = -1;68	u64 sq_total_time = 0, sq_work_time = 0;69	bool has_lock;70	unsigned int i;71 72	if (ctx->flags & IORING_SETUP_CQE32)73		cq_shift = 1;74	if (ctx->flags & IORING_SETUP_SQE128)75		sq_shift = 1;76 77	/*78	 * we may get imprecise sqe and cqe info if uring is actively running79	 * since we get cached_sq_head and cached_cq_tail without uring_lock80	 * and sq_tail and cq_head are changed by userspace. But it's ok since81	 * we usually use these info when it is stuck.82	 */83	seq_printf(m, "SqMask:\t0x%x\n", sq_mask);84	seq_printf(m, "SqHead:\t%u\n", sq_head);85	seq_printf(m, "SqTail:\t%u\n", sq_tail);86	seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);87	seq_printf(m, "CqMask:\t0x%x\n", cq_mask);88	seq_printf(m, "CqHead:\t%u\n", cq_head);89	seq_printf(m, "CqTail:\t%u\n", cq_tail);90	seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);91	seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head);92	sq_entries = min(sq_tail - sq_head, ctx->sq_entries);93	for (i = 0; i < sq_entries; i++) {94		unsigned int entry = i + sq_head;95		struct io_uring_sqe *sqe;96		unsigned int sq_idx;97 98		if (ctx->flags & IORING_SETUP_NO_SQARRAY)99			break;100		sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);101		if (sq_idx > sq_mask)102			continue;103		sqe = &ctx->sq_sqes[sq_idx << sq_shift];104		seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "105			      "addr:0x%llx, rw_flags:0x%x, buf_index:%d "106			      "user_data:%llu",107			   sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd,108			   sqe->flags, (unsigned long long) sqe->off,109			   (unsigned long long) sqe->addr, sqe->rw_flags,110			   sqe->buf_index, sqe->user_data);111		if (sq_shift) {112			u64 *sqeb = (void *) (sqe + 1);113			int size = sizeof(struct io_uring_sqe) / sizeof(u64);114			int j;115 116			for (j = 0; j < size; j++) {117				seq_printf(m, ", e%d:0x%llx", j,118						(unsigned long long) *sqeb);119				sqeb++;120			}121		}122		seq_printf(m, "\n");123	}124	seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);125	cq_entries = min(cq_tail - cq_head, ctx->cq_entries);126	for (i = 0; i < cq_entries; i++) {127		unsigned int entry = i + cq_head;128		struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];129 130		seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x",131			   entry & cq_mask, cqe->user_data, cqe->res,132			   cqe->flags);133		if (cq_shift)134			seq_printf(m, ", extra1:%llu, extra2:%llu\n",135					cqe->big_cqe[0], cqe->big_cqe[1]);136		seq_printf(m, "\n");137	}138 139	/*140	 * Avoid ABBA deadlock between the seq lock and the io_uring mutex,141	 * since fdinfo case grabs it in the opposite direction of normal use142	 * cases. If we fail to get the lock, we just don't iterate any143	 * structures that could be going away outside the io_uring mutex.144	 */145	has_lock = mutex_trylock(&ctx->uring_lock);146 147	if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {148		struct io_sq_data *sq = ctx->sq_data;149 150		/*151		 * sq->thread might be NULL if we raced with the sqpoll152		 * thread termination.153		 */154		if (sq->thread) {155			sq_pid = sq->task_pid;156			sq_cpu = sq->sq_cpu;157			getrusage(sq->thread, RUSAGE_SELF, &sq_usage);158			sq_total_time = (sq_usage.ru_stime.tv_sec * 1000000159					 + sq_usage.ru_stime.tv_usec);160			sq_work_time = sq->work_time;161		}162	}163 164	seq_printf(m, "SqThread:\t%d\n", sq_pid);165	seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu);166	seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time);167	seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time);168	seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);169	for (i = 0; has_lock && i < ctx->nr_user_files; i++) {170		struct file *f = io_file_from_index(&ctx->file_table, i);171 172		if (f)173			seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);174		else175			seq_printf(m, "%5u: <none>\n", i);176	}177	seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);178	for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {179		struct io_mapped_ubuf *buf = ctx->user_bufs[i];180 181		seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, buf->len);182	}183	if (has_lock && !xa_empty(&ctx->personalities)) {184		unsigned long index;185		const struct cred *cred;186 187		seq_printf(m, "Personalities:\n");188		xa_for_each(&ctx->personalities, index, cred)189			io_uring_show_cred(m, index, cred);190	}191 192	seq_puts(m, "PollList:\n");193	for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) {194		struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i];195		struct io_hash_bucket *hbl = &ctx->cancel_table_locked.hbs[i];196		struct io_kiocb *req;197 198		spin_lock(&hb->lock);199		hlist_for_each_entry(req, &hb->list, hash_node)200			seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,201					task_work_pending(req->task));202		spin_unlock(&hb->lock);203 204		if (!has_lock)205			continue;206		hlist_for_each_entry(req, &hbl->list, hash_node)207			seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,208					task_work_pending(req->task));209	}210 211	if (has_lock)212		mutex_unlock(&ctx->uring_lock);213 214	seq_puts(m, "CqOverflowList:\n");215	spin_lock(&ctx->completion_lock);216	list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {217		struct io_uring_cqe *cqe = &ocqe->cqe;218 219		seq_printf(m, "  user_data=%llu, res=%d, flags=%x\n",220			   cqe->user_data, cqe->res, cqe->flags);221 222	}223	spin_unlock(&ctx->completion_lock);224 225#ifdef CONFIG_NET_RX_BUSY_POLL226	if (ctx->napi_enabled) {227		seq_puts(m, "NAPI:\tenabled\n");228		seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt);229		if (ctx->napi_prefer_busy_poll)230			seq_puts(m, "napi_prefer_busy_poll:\ttrue\n");231		else232			seq_puts(m, "napi_prefer_busy_poll:\tfalse\n");233	} else {234		seq_puts(m, "NAPI:\tdisabled\n");235	}236#endif237}238#endif239