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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288// SPDX-License-Identifier: GPL-2.0#include <linux/kernel.h>#include <linux/errno.h>#include <linux/fs.h>#include <linux/file.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/nospec.h>#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "filetable.h"#include "sqpoll.h"#include "fdinfo.h"#include "cancel.h"#include "rsrc.h"#include "opdef.h"
#ifdef CONFIG_NET_RX_BUSY_POLLstatic __cold void common_tracking_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m, const char *tracking_strategy){ seq_puts(m, "NAPI:\tenabled\n"); seq_printf(m, "napi tracking:\t%s\n", tracking_strategy); seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt); if (ctx->napi_prefer_busy_poll) seq_puts(m, "napi_prefer_busy_poll:\ttrue\n"); else seq_puts(m, "napi_prefer_busy_poll:\tfalse\n");}
static __cold void napi_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m){ unsigned int mode = READ_ONCE(ctx->napi_track_mode);
switch (mode) { case IO_URING_NAPI_TRACKING_INACTIVE: seq_puts(m, "NAPI:\tdisabled\n"); break; case IO_URING_NAPI_TRACKING_DYNAMIC: common_tracking_show_fdinfo(ctx, m, "dynamic"); break; case IO_URING_NAPI_TRACKING_STATIC: common_tracking_show_fdinfo(ctx, m, "static"); break; default: seq_printf(m, "NAPI:\tunknown mode (%u)\n", mode); }}#elsestatic inline void napi_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m){}#endif
static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m){ struct io_overflow_cqe *ocqe; struct io_rings *r = ctx->rings; unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; unsigned int sq_head = READ_ONCE(r->sq.head); unsigned int sq_tail = READ_ONCE(r->sq.tail); unsigned int cq_head = READ_ONCE(r->cq.head); unsigned int cq_tail = READ_ONCE(r->cq.tail); unsigned int sq_shift = 0; unsigned int cq_entries, sq_entries; int sq_pid = -1, sq_cpu = -1; u64 sq_total_time = 0, sq_work_time = 0; unsigned int i;
if (ctx->flags & IORING_SETUP_SQE128) sq_shift = 1;
/* * we may get imprecise sqe and cqe info if uring is actively running * since we get cached_sq_head and cached_cq_tail without uring_lock * and sq_tail and cq_head are changed by userspace. But it's ok since * we usually use these info when it is stuck. */ seq_printf(m, "SqMask:\t0x%x\n", sq_mask); seq_printf(m, "SqHead:\t%u\n", sq_head); seq_printf(m, "SqTail:\t%u\n", sq_tail); seq_printf(m, "CachedSqHead:\t%u\n", data_race(ctx->cached_sq_head)); seq_printf(m, "CqMask:\t0x%x\n", cq_mask); seq_printf(m, "CqHead:\t%u\n", cq_head); seq_printf(m, "CqTail:\t%u\n", cq_tail); seq_printf(m, "CachedCqTail:\t%u\n", data_race(ctx->cached_cq_tail)); seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head); sq_entries = min(sq_tail - sq_head, ctx->sq_entries); for (i = 0; i < sq_entries; i++) { unsigned int entry = i + sq_head; struct io_uring_sqe *sqe; unsigned int sq_idx; bool sqe128 = false; u8 opcode;
if (ctx->flags & IORING_SETUP_NO_SQARRAY) sq_idx = entry & sq_mask; else sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); if (sq_idx > sq_mask) continue;
sqe = &ctx->sq_sqes[sq_idx << sq_shift]; opcode = READ_ONCE(sqe->opcode); if (opcode >= IORING_OP_LAST) continue; opcode = array_index_nospec(opcode, IORING_OP_LAST); if (sq_shift) { sqe128 = true; } else if (io_issue_defs[opcode].is_128) { if (!(ctx->flags & IORING_SETUP_SQE_MIXED)) { seq_printf(m, "%5u: invalid sqe, 128B entry on non-mixed sq\n", sq_idx); break; } if (sq_idx == sq_mask) { seq_printf(m, "%5u: corrupted sqe, wrapping 128B entry\n", sq_idx); break; } sq_head++; i++; sqe128 = true; } seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, " "addr:0x%llx, rw_flags:0x%x, buf_index:%d " "user_data:%llu", sq_idx, io_uring_get_opcode(opcode), sqe->fd, sqe->flags, (unsigned long long) sqe->off, (unsigned long long) sqe->addr, sqe->rw_flags, sqe->buf_index, sqe->user_data); if (sqe128) { u64 *sqeb = (void *) (sqe + 1); int size = sizeof(struct io_uring_sqe) / sizeof(u64); int j;
for (j = 0; j < size; j++) { seq_printf(m, ", e%d:0x%llx", j, (unsigned long long) *sqeb); sqeb++; } } seq_printf(m, "\n"); cond_resched(); } seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); cq_entries = min(cq_tail - cq_head, ctx->cq_entries); for (i = 0; i < cq_entries; i++) { struct io_uring_cqe *cqe; bool cqe32 = false, two_entries = false; bool is_last_cqarray_slot = (cq_head & cq_mask) == cq_mask;
if (ctx->flags & IORING_SETUP_CQE32) { /* all entries have twice the size */ cqe = &r->cqes[(cq_head & cq_mask) << 1]; cqe32 = true; } else { cqe = &r->cqes[(cq_head & cq_mask)]; /* * Userspace can manipulate the last cqarray slot to * have IORING_CQE_F_32 set, which would cause the second * half of that CQE to be read out of bounds. * Ignore the flag for the last cqarray slot, which can't * legitimately have the flag set. */ two_entries = (cqe->flags & IORING_CQE_F_32) && !is_last_cqarray_slot; cqe32 = two_entries; } seq_printf(m, "%5u: user_data:%llu, res:%d, flags:%x", cq_head & cq_mask, cqe->user_data, cqe->res, cqe->flags); if (cqe32) seq_printf(m, ", extra1:%llu, extra2:%llu", cqe->big_cqe[0], cqe->big_cqe[1]); seq_printf(m, "\n"); cq_head++; if (two_entries) { cq_head++; i++; } cond_resched(); }
if (ctx->flags & IORING_SETUP_SQPOLL) { struct io_sq_data *sq = ctx->sq_data; struct task_struct *tsk;
rcu_read_lock(); tsk = rcu_dereference(sq->thread); /* * sq->thread might be NULL if we raced with the sqpoll * thread termination. */ if (tsk) { u64 usec;
get_task_struct(tsk); rcu_read_unlock(); usec = io_sq_cpu_usec(tsk); sq_pid = task_pid_nr_ns(tsk, proc_pid_ns(file_inode(m->file)->i_sb)); put_task_struct(tsk); sq_cpu = sq->sq_cpu; sq_total_time = usec; sq_work_time = sq->work_time; } else { rcu_read_unlock(); } }
seq_printf(m, "SqThread:\t%d\n", sq_pid); seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu); seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time); seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time); seq_printf(m, "UserFiles:\t%u\n", ctx->file_table.data.nr); for (i = 0; i < ctx->file_table.data.nr; i++) { struct file *f = NULL;
if (ctx->file_table.data.nodes[i]) f = io_slot_file(ctx->file_table.data.nodes[i]); if (f) { seq_printf(m, "%5u: ", i); seq_file_path(m, f, " \t\n\\"); seq_puts(m, "\n"); } } seq_printf(m, "UserBufs:\t%u\n", ctx->buf_table.nr); for (i = 0; i < ctx->buf_table.nr; i++) { struct io_mapped_ubuf *buf = NULL;
if (ctx->buf_table.nodes[i]) buf = ctx->buf_table.nodes[i]->buf; if (buf) seq_printf(m, "%5u: 0x%llx/%zu\n", i, buf->ubuf, buf->len); else seq_printf(m, "%5u: <none>\n", i); }
seq_puts(m, "PollList:\n"); for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) { struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i]; struct io_kiocb *req;
hlist_for_each_entry(req, &hb->list, hash_node) seq_printf(m, " op=%d, task_works=%d\n", req->opcode, task_work_pending(req->tctx->task)); }
seq_puts(m, "CqOverflowList:\n"); spin_lock(&ctx->completion_lock); list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { struct io_uring_cqe *cqe = &ocqe->cqe;
seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", cqe->user_data, cqe->res, cqe->flags);
} spin_unlock(&ctx->completion_lock); napi_show_fdinfo(ctx, m);}
/* * Caller holds a reference to the file already, we don't need to do * anything else to get an extra reference. */__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file){ struct io_ring_ctx *ctx = file->private_data;
/* * Avoid ABBA deadlock between the seq lock and the io_uring mutex, * since fdinfo case grabs it in the opposite direction of normal use * cases. */ if (mutex_trylock(&ctx->uring_lock)) { __io_uring_show_fdinfo(ctx, m); mutex_unlock(&ctx->uring_lock); }}