diff options
Diffstat (limited to 'io_uring/fdinfo.c')
| -rw-r--r-- | io_uring/fdinfo.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c new file mode 100644 index 000000000000..a87d4e26eee8 --- /dev/null +++ b/io_uring/fdinfo.c @@ -0,0 +1,264 @@ +// 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_POLL +static __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); + } +} +#else +static 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 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_head & sq_mask) == 0) { + seq_printf(m, + "%5u: corrupted sqe, wrapping 128B entry\n", + sq_idx); + break; + } + 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"); + } + seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); + while (cq_head < cq_tail) { + struct io_uring_cqe *cqe; + bool cqe32 = false; + + cqe = &r->cqes[(cq_head & cq_mask)]; + if (cqe->flags & IORING_CQE_F_32 || ctx->flags & IORING_SETUP_CQE32) + cqe32 = true; + 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\n", + cqe->big_cqe[0], cqe->big_cqe[1]); + seq_printf(m, "\n"); + cq_head++; + if (cqe32) + cq_head++; + } + + 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); + put_task_struct(tsk); + sq_pid = sq->task_pid; + 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/%u\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); + } +} |