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de23077e JA |
1 | #ifndef IOU_CORE_H |
2 | #define IOU_CORE_H | |
3 | ||
4 | #include <linux/errno.h> | |
cd40cae2 | 5 | #include <linux/lockdep.h> |
b5d3ae20 | 6 | #include <linux/resume_user_mode.h> |
c1755c25 | 7 | #include <linux/kasan.h> |
ab1c84d8 | 8 | #include <linux/io_uring_types.h> |
44648532 | 9 | #include <uapi/linux/eventpoll.h> |
ab1c84d8 | 10 | #include "io-wq.h" |
a6b21fbb | 11 | #include "slist.h" |
ab1c84d8 | 12 | #include "filetable.h" |
de23077e | 13 | |
f3b44f92 JA |
14 | #ifndef CREATE_TRACE_POINTS |
15 | #include <trace/events/io_uring.h> | |
16 | #endif | |
17 | ||
8501fe70 | 18 | enum { |
8751d154 PB |
19 | /* |
20 | * A hint to not wake right away but delay until there are enough of | |
21 | * tw's queued to match the number of CQEs the task is waiting for. | |
22 | * | |
23 | * Must not be used wirh requests generating more than one CQE. | |
24 | * It's also ignored unless IORING_SETUP_DEFER_TASKRUN is set. | |
25 | */ | |
91c7884a | 26 | IOU_F_TWQ_LAZY_WAKE = 1, |
8501fe70 PB |
27 | }; |
28 | ||
97b388d7 JA |
29 | enum { |
30 | IOU_OK = 0, | |
31 | IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED, | |
114eccdf DY |
32 | |
33 | /* | |
91482864 PB |
34 | * Intended only when both IO_URING_F_MULTISHOT is passed |
35 | * to indicate to the poll runner that multishot should be | |
114eccdf DY |
36 | * removed and the result is set on req->cqe.res. |
37 | */ | |
38 | IOU_STOP_MULTISHOT = -ECANCELED, | |
97b388d7 JA |
39 | }; |
40 | ||
aa1df3a3 | 41 | struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow); |
056695bf | 42 | void io_req_cqe_overflow(struct io_kiocb *req); |
c0e0d6ba | 43 | int io_run_task_work_sig(struct io_ring_ctx *ctx); |
973fc83f | 44 | void io_req_defer_failed(struct io_kiocb *req, s32 res); |
1bec951c | 45 | void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags); |
b529c96a | 46 | bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags); |
d86eaed1 | 47 | bool io_aux_cqe(const struct io_kiocb *req, bool defer, s32 res, u32 cflags, |
9b8c5475 | 48 | bool allow_overflow); |
9046c641 PB |
49 | void __io_commit_cqring_flush(struct io_ring_ctx *ctx); |
50 | ||
51 | struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages); | |
52 | ||
53 | struct file *io_file_get_normal(struct io_kiocb *req, int fd); | |
54 | struct file *io_file_get_fixed(struct io_kiocb *req, int fd, | |
55 | unsigned issue_flags); | |
56 | ||
8501fe70 | 57 | void __io_req_task_work_add(struct io_kiocb *req, unsigned flags); |
9046c641 PB |
58 | bool io_is_uring_fops(struct file *file); |
59 | bool io_alloc_async_data(struct io_kiocb *req); | |
9046c641 | 60 | void io_req_task_queue(struct io_kiocb *req); |
a282967c PB |
61 | void io_queue_iowq(struct io_kiocb *req, struct io_tw_state *ts_dont_use); |
62 | void io_req_task_complete(struct io_kiocb *req, struct io_tw_state *ts); | |
9046c641 | 63 | void io_req_task_queue_fail(struct io_kiocb *req, int ret); |
a282967c | 64 | void io_req_task_submit(struct io_kiocb *req, struct io_tw_state *ts); |
9046c641 PB |
65 | void tctx_task_work(struct callback_head *cb); |
66 | __cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); | |
67 | int io_uring_alloc_task_context(struct task_struct *task, | |
68 | struct io_ring_ctx *ctx); | |
69 | ||
6e76ac59 JT |
70 | int io_ring_add_registered_file(struct io_uring_task *tctx, struct file *file, |
71 | int start, int end); | |
72 | ||
a282967c | 73 | int io_poll_issue(struct io_kiocb *req, struct io_tw_state *ts); |
9046c641 PB |
74 | int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr); |
75 | int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin); | |
76 | void io_free_batch_list(struct io_ring_ctx *ctx, struct io_wq_work_node *node); | |
77 | int io_req_prep_async(struct io_kiocb *req); | |
78 | ||
79 | struct io_wq_work *io_wq_free_work(struct io_wq_work *work); | |
80 | void io_wq_submit_work(struct io_wq_work *work); | |
81 | ||
82 | void io_free_req(struct io_kiocb *req); | |
83 | void io_queue_next(struct io_kiocb *req); | |
63809137 | 84 | void io_task_refs_refill(struct io_uring_task *tctx); |
bd1a3783 | 85 | bool __io_alloc_req_refill(struct io_ring_ctx *ctx); |
9046c641 PB |
86 | |
87 | bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
88 | bool cancel_all); | |
89 | ||
f26cc959 PB |
90 | #define io_lockdep_assert_cq_locked(ctx) \ |
91 | do { \ | |
8ce4269e PB |
92 | lockdep_assert(in_task()); \ |
93 | \ | |
f26cc959 PB |
94 | if (ctx->flags & IORING_SETUP_IOPOLL) { \ |
95 | lockdep_assert_held(&ctx->uring_lock); \ | |
96 | } else if (!ctx->task_complete) { \ | |
97 | lockdep_assert_held(&ctx->completion_lock); \ | |
98 | } else if (ctx->submitter_task->flags & PF_EXITING) { \ | |
99 | lockdep_assert(current_work()); \ | |
100 | } else { \ | |
101 | lockdep_assert(current == ctx->submitter_task); \ | |
102 | } \ | |
103 | } while (0) | |
104 | ||
e52d2e58 PB |
105 | static inline void io_req_task_work_add(struct io_kiocb *req) |
106 | { | |
8501fe70 | 107 | __io_req_task_work_add(req, 0); |
e52d2e58 PB |
108 | } |
109 | ||
9046c641 PB |
110 | #define io_for_each_link(pos, head) \ |
111 | for (pos = (head); pos; pos = pos->link) | |
f3b44f92 | 112 | |
aa1df3a3 PB |
113 | static inline struct io_uring_cqe *io_get_cqe_overflow(struct io_ring_ctx *ctx, |
114 | bool overflow) | |
f3b44f92 | 115 | { |
f26cc959 PB |
116 | io_lockdep_assert_cq_locked(ctx); |
117 | ||
f3b44f92 JA |
118 | if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { |
119 | struct io_uring_cqe *cqe = ctx->cqe_cached; | |
120 | ||
f3b44f92 JA |
121 | ctx->cached_cq_tail++; |
122 | ctx->cqe_cached++; | |
b3659a65 PB |
123 | if (ctx->flags & IORING_SETUP_CQE32) |
124 | ctx->cqe_cached++; | |
f3b44f92 JA |
125 | return cqe; |
126 | } | |
127 | ||
aa1df3a3 PB |
128 | return __io_get_cqe(ctx, overflow); |
129 | } | |
130 | ||
131 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) | |
132 | { | |
133 | return io_get_cqe_overflow(ctx, false); | |
f3b44f92 JA |
134 | } |
135 | ||
00b0db56 | 136 | static inline bool io_fill_cqe_req(struct io_ring_ctx *ctx, struct io_kiocb *req) |
f3b44f92 JA |
137 | { |
138 | struct io_uring_cqe *cqe; | |
139 | ||
e8c328c3 PB |
140 | /* |
141 | * If we can't get a cq entry, userspace overflowed the | |
142 | * submission (by quite a lot). Increment the overflow count in | |
143 | * the ring. | |
144 | */ | |
145 | cqe = io_get_cqe(ctx); | |
146 | if (unlikely(!cqe)) | |
f66f7342 | 147 | return false; |
e0486f3f DY |
148 | |
149 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
150 | req->cqe.res, req->cqe.flags, | |
151 | (req->flags & REQ_F_CQE32_INIT) ? req->extra1 : 0, | |
152 | (req->flags & REQ_F_CQE32_INIT) ? req->extra2 : 0); | |
153 | ||
e8c328c3 PB |
154 | memcpy(cqe, &req->cqe, sizeof(*cqe)); |
155 | ||
156 | if (ctx->flags & IORING_SETUP_CQE32) { | |
f3b44f92 JA |
157 | u64 extra1 = 0, extra2 = 0; |
158 | ||
159 | if (req->flags & REQ_F_CQE32_INIT) { | |
160 | extra1 = req->extra1; | |
161 | extra2 = req->extra2; | |
162 | } | |
163 | ||
e8c328c3 PB |
164 | WRITE_ONCE(cqe->big_cqe[0], extra1); |
165 | WRITE_ONCE(cqe->big_cqe[1], extra2); | |
f3b44f92 | 166 | } |
e8c328c3 | 167 | return true; |
f3b44f92 JA |
168 | } |
169 | ||
531113bb JA |
170 | static inline void req_set_fail(struct io_kiocb *req) |
171 | { | |
172 | req->flags |= REQ_F_FAIL; | |
173 | if (req->flags & REQ_F_CQE_SKIP) { | |
174 | req->flags &= ~REQ_F_CQE_SKIP; | |
175 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
176 | } | |
177 | } | |
178 | ||
de23077e JA |
179 | static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags) |
180 | { | |
181 | req->cqe.res = res; | |
182 | req->cqe.flags = cflags; | |
183 | } | |
184 | ||
99f15d8d JA |
185 | static inline bool req_has_async_data(struct io_kiocb *req) |
186 | { | |
187 | return req->flags & REQ_F_ASYNC_DATA; | |
188 | } | |
189 | ||
17bc2837 | 190 | static inline void io_put_file(struct io_kiocb *req) |
531113bb | 191 | { |
17bc2837 JA |
192 | if (!(req->flags & REQ_F_FIXED_FILE) && req->file) |
193 | fput(req->file); | |
531113bb JA |
194 | } |
195 | ||
cd40cae2 JA |
196 | static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx, |
197 | unsigned issue_flags) | |
198 | { | |
199 | lockdep_assert_held(&ctx->uring_lock); | |
200 | if (issue_flags & IO_URING_F_UNLOCKED) | |
201 | mutex_unlock(&ctx->uring_lock); | |
202 | } | |
203 | ||
204 | static inline void io_ring_submit_lock(struct io_ring_ctx *ctx, | |
205 | unsigned issue_flags) | |
206 | { | |
207 | /* | |
208 | * "Normal" inline submissions always hold the uring_lock, since we | |
209 | * grab it from the system call. Same is true for the SQPOLL offload. | |
210 | * The only exception is when we've detached the request and issue it | |
211 | * from an async worker thread, grab the lock for that case. | |
212 | */ | |
213 | if (issue_flags & IO_URING_F_UNLOCKED) | |
214 | mutex_lock(&ctx->uring_lock); | |
215 | lockdep_assert_held(&ctx->uring_lock); | |
216 | } | |
217 | ||
f9ead18c JA |
218 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
219 | { | |
220 | /* order cqe stores with ring update */ | |
221 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
222 | } | |
223 | ||
7b235dd8 PB |
224 | static inline void io_poll_wq_wake(struct io_ring_ctx *ctx) |
225 | { | |
bca39f39 | 226 | if (wq_has_sleeper(&ctx->poll_wq)) |
7b235dd8 PB |
227 | __wake_up(&ctx->poll_wq, TASK_NORMAL, 0, |
228 | poll_to_key(EPOLL_URING_WAKE | EPOLLIN)); | |
229 | } | |
230 | ||
6e7248ad | 231 | static inline void io_cqring_wake(struct io_ring_ctx *ctx) |
f3b44f92 JA |
232 | { |
233 | /* | |
44648532 JA |
234 | * Trigger waitqueue handler on all waiters on our waitqueue. This |
235 | * won't necessarily wake up all the tasks, io_should_wake() will make | |
236 | * that decision. | |
237 | * | |
238 | * Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter | |
239 | * set in the mask so that if we recurse back into our own poll | |
240 | * waitqueue handlers, we know we have a dependency between eventfd or | |
241 | * epoll and should terminate multishot poll at that point. | |
f3b44f92 | 242 | */ |
6e7248ad | 243 | if (wq_has_sleeper(&ctx->cq_wait)) |
44648532 JA |
244 | __wake_up(&ctx->cq_wait, TASK_NORMAL, 0, |
245 | poll_to_key(EPOLL_URING_WAKE | EPOLLIN)); | |
f3b44f92 JA |
246 | } |
247 | ||
17437f31 JA |
248 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
249 | { | |
250 | struct io_rings *r = ctx->rings; | |
251 | ||
252 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; | |
253 | } | |
254 | ||
255 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) | |
256 | { | |
257 | struct io_rings *rings = ctx->rings; | |
e3ef728f | 258 | unsigned int entries; |
17437f31 JA |
259 | |
260 | /* make sure SQ entry isn't read before tail */ | |
e3ef728f JA |
261 | entries = smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; |
262 | return min(entries, ctx->sq_entries); | |
17437f31 JA |
263 | } |
264 | ||
c0e0d6ba | 265 | static inline int io_run_task_work(void) |
17437f31 | 266 | { |
7cfe7a09 JA |
267 | /* |
268 | * Always check-and-clear the task_work notification signal. With how | |
269 | * signaling works for task_work, we can find it set with nothing to | |
270 | * run. We need to clear it for that case, like get_signal() does. | |
271 | */ | |
272 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) | |
273 | clear_notify_signal(); | |
b5d3ae20 JA |
274 | /* |
275 | * PF_IO_WORKER never returns to userspace, so check here if we have | |
276 | * notify work that needs processing. | |
277 | */ | |
278 | if (current->flags & PF_IO_WORKER && | |
2f2bb1ff JA |
279 | test_thread_flag(TIF_NOTIFY_RESUME)) { |
280 | __set_current_state(TASK_RUNNING); | |
b5d3ae20 | 281 | resume_user_mode_work(NULL); |
2f2bb1ff | 282 | } |
46a525e1 | 283 | if (task_work_pending(current)) { |
17437f31 | 284 | __set_current_state(TASK_RUNNING); |
46a525e1 | 285 | task_work_run(); |
c0e0d6ba | 286 | return 1; |
17437f31 JA |
287 | } |
288 | ||
c0e0d6ba DY |
289 | return 0; |
290 | } | |
291 | ||
dac6a0ea JA |
292 | static inline bool io_task_work_pending(struct io_ring_ctx *ctx) |
293 | { | |
6434ec01 | 294 | return task_work_pending(current) || !wq_list_empty(&ctx->work_llist); |
dac6a0ea JA |
295 | } |
296 | ||
a282967c | 297 | static inline void io_tw_lock(struct io_ring_ctx *ctx, struct io_tw_state *ts) |
aa1e90f6 | 298 | { |
a282967c | 299 | if (!ts->locked) { |
aa1e90f6 | 300 | mutex_lock(&ctx->uring_lock); |
a282967c | 301 | ts->locked = true; |
aa1e90f6 PB |
302 | } |
303 | } | |
304 | ||
9da070b1 PB |
305 | /* |
306 | * Don't complete immediately but use deferred completion infrastructure. | |
307 | * Protected by ->uring_lock and can only be used either with | |
308 | * IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex. | |
309 | */ | |
310 | static inline void io_req_complete_defer(struct io_kiocb *req) | |
311 | __must_hold(&req->ctx->uring_lock) | |
aa1e90f6 PB |
312 | { |
313 | struct io_submit_state *state = &req->ctx->submit_state; | |
314 | ||
9da070b1 PB |
315 | lockdep_assert_held(&req->ctx->uring_lock); |
316 | ||
aa1e90f6 PB |
317 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
318 | } | |
319 | ||
46929b08 PB |
320 | static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx) |
321 | { | |
bca39f39 PB |
322 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
323 | ctx->has_evfd || ctx->poll_activated)) | |
46929b08 PB |
324 | __io_commit_cqring_flush(ctx); |
325 | } | |
326 | ||
63809137 PB |
327 | static inline void io_get_task_refs(int nr) |
328 | { | |
329 | struct io_uring_task *tctx = current->io_uring; | |
330 | ||
331 | tctx->cached_refs -= nr; | |
332 | if (unlikely(tctx->cached_refs < 0)) | |
333 | io_task_refs_refill(tctx); | |
334 | } | |
335 | ||
bd1a3783 PB |
336 | static inline bool io_req_cache_empty(struct io_ring_ctx *ctx) |
337 | { | |
338 | return !ctx->submit_state.free_list.next; | |
339 | } | |
340 | ||
c1755c25 BL |
341 | extern struct kmem_cache *req_cachep; |
342 | ||
c8576f3e | 343 | static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx) |
bd1a3783 | 344 | { |
c1755c25 | 345 | struct io_kiocb *req; |
bd1a3783 | 346 | |
c1755c25 | 347 | req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list); |
c1755c25 BL |
348 | wq_stack_extract(&ctx->submit_state.free_list); |
349 | return req; | |
bd1a3783 PB |
350 | } |
351 | ||
c8576f3e PB |
352 | static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req) |
353 | { | |
354 | if (unlikely(io_req_cache_empty(ctx))) { | |
355 | if (!__io_alloc_req_refill(ctx)) | |
356 | return false; | |
357 | } | |
358 | *req = io_extract_req(ctx); | |
359 | return true; | |
360 | } | |
361 | ||
140102ae PB |
362 | static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx) |
363 | { | |
364 | return likely(ctx->submitter_task == current); | |
365 | } | |
366 | ||
76de6749 PB |
367 | static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx) |
368 | { | |
6567506b PB |
369 | return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) || |
370 | ctx->submitter_task == current); | |
76de6749 PB |
371 | } |
372 | ||
833b5dff PB |
373 | static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res) |
374 | { | |
375 | io_req_set_res(req, res, 0); | |
376 | req->io_task_work.func = io_req_task_complete; | |
377 | io_req_task_work_add(req); | |
378 | } | |
379 | ||
96c7d4f8 BL |
380 | /* |
381 | * IORING_SETUP_SQE128 contexts allocate twice the normal SQE size for each | |
382 | * slot. | |
383 | */ | |
384 | static inline size_t uring_sqe_size(struct io_ring_ctx *ctx) | |
385 | { | |
386 | if (ctx->flags & IORING_SETUP_SQE128) | |
387 | return 2 * sizeof(struct io_uring_sqe); | |
388 | return sizeof(struct io_uring_sqe); | |
389 | } | |
de23077e | 390 | #endif |