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setup.cfa @ 5024df4

ADTast-experimentalpthread-emulationqualifiedEnum

Last change on this file since 5024df4 was 108345a, checked in by Thierry Delisle <tdelisle@…>, 2 years ago
visbility for io
Property mode set to `100644`
File size: 12.5 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// io/setup.cfa --
8	//
9	// Author : Thierry Delisle
10	// Created On : Fri Jul 31 16:25:51 2020
11	// Last Modified By :
12	// Last Modified On :
13	// Update Count :
14	//
15
16	#define __cforall_thread__
17	#define _GNU_SOURCE
18
19	#if defined(__CFA_DEBUG__)
20	// #define __CFA_DEBUG_PRINT_IO__
21	// #define __CFA_DEBUG_PRINT_IO_CORE__
22	#endif
23
24	#include "io/types.hfa"
25	#include "kernel.hfa"
26
27	#if !defined(CFA_HAVE_LINUX_IO_URING_H)
28	void ?{}(io_context_params & this) libcfa_public {}
29
30	void ?{}($io_context & this, struct cluster & cl) {}
31	void ^?{}($io_context & this) {}
32
33	void __cfa_io_start( processor * proc ) {}
34	bool __cfa_io_flush( processor * proc ) { return false; }
35	bool __cfa_io_drain( processor * proc ) __attribute__((nonnull (1))) { return false; }
36	void __cfa_io_idle ( processor * ) __attribute__((nonnull (1))) {}
37	void __cfa_io_stop ( processor * proc ) {}
38
39	$io_arbiter * create(void) { return 0p; }
40	void destroy($io_arbiter *) {}
41
42	#else
43	#pragma GCC diagnostic push
44	#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
45	#include <errno.h>
46	#include <stdint.h>
47	#include <string.h>
48	#include <signal.h>
49	#include <unistd.h>
50
51	extern "C" {
52	#include <pthread.h>
53	#include <sys/epoll.h>
54	#include <sys/eventfd.h>
55	#include <sys/mman.h>
56	#include <sys/syscall.h>
57
58	#include <linux/io_uring.h>
59	}
60
61	#include "bitmanip.hfa"
62	#include "fstream.hfa"
63	#include "kernel/private.hfa"
64	#include "limits.hfa"
65	#include "thread.hfa"
66	#pragma GCC diagnostic pop
67
68	void ?{}(io_context_params & this) libcfa_public {
69	this.num_entries = 256;
70	}
71
72	static void * __io_poller_slow( void * arg );
73
74	// Weirdly, some systems that do support io_uring don't actually define these
75	#ifdef __alpha__
76	/*
77	* alpha is the only exception, all other architectures
78	* have common numbers for new system calls.
79	*/
80	#ifndef __NR_io_uring_setup
81	#define __NR_io_uring_setup 535
82	#endif
83	#ifndef __NR_io_uring_enter
84	#define __NR_io_uring_enter 536
85	#endif
86	#ifndef __NR_io_uring_register
87	#define __NR_io_uring_register 537
88	#endif
89	#else /* !__alpha__ */
90	#ifndef __NR_io_uring_setup
91	#define __NR_io_uring_setup 425
92	#endif
93	#ifndef __NR_io_uring_enter
94	#define __NR_io_uring_enter 426
95	#endif
96	#ifndef __NR_io_uring_register
97	#define __NR_io_uring_register 427
98	#endif
99	#endif
100
101	//=============================================================================================
102	// I/O Context Constrution/Destruction
103	//=============================================================================================
104
105
106
107	static void __io_uring_setup ( $io_context & this, const io_context_params & params_in, int procfd );
108	static void __io_uring_teardown( $io_context & this );
109	static void __epoll_register($io_context & ctx);
110	static void __epoll_unregister($io_context & ctx);
111	void __ioarbiter_register( $io_arbiter & mutex, $io_context & ctx );
112	void __ioarbiter_unregister( $io_arbiter & mutex, $io_context & ctx );
113
114	void ?{}($io_context & this, processor * proc, struct cluster & cl) {
115	/* paranoid */ verify( cl.io.arbiter );
116	this.proc = proc;
117	this.arbiter = cl.io.arbiter;
118	this.ext_sq.empty = true;
119	(this.ext_sq.queue){};
120	__io_uring_setup( this, cl.io.params, proc->idle_wctx.evfd );
121	__cfadbg_print_safe(io_core, "Kernel I/O : Created ring for io_context %u (%p)\n", this.fd, &this);
122	}
123
124	void ^?{}($io_context & this) {
125	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %u\n", this.fd);
126
127	__io_uring_teardown( this );
128	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %u\n", this.fd);
129	}
130
131	static void __io_uring_setup( $io_context & this, const io_context_params & params_in, int procfd ) {
132	// Step 1 : call to setup
133	struct io_uring_params params;
134	memset(&params, 0, sizeof(params));
135	// if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
136	// if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
137
138	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
139	if( !is_pow2(nentries) ) {
140	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
141	}
142
143	int fd = syscall(__NR_io_uring_setup, nentries, &params );
144	if(fd < 0) {
145	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
146	}
147
148	// Step 2 : mmap result
149	struct __sub_ring_t & sq = this.sq;
150	struct __cmp_ring_t & cq = this.cq;
151
152	// calculate the right ring size
153	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
154	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
155
156	// Requires features
157	#if defined(IORING_FEAT_SINGLE_MMAP)
158	// adjust the size according to the parameters
159	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
160	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
161	}
162	#endif
163
164	// mmap the Submit Queue into existence
165	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
166	if (sq.ring_ptr == (void*)MAP_FAILED) {
167	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
168	}
169
170	// Requires features
171	#if defined(IORING_FEAT_SINGLE_MMAP)
172	// mmap the Completion Queue into existence (may or may not be needed)
173	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
174	cq.ring_ptr = sq.ring_ptr;
175	}
176	else
177	#endif
178	{
179	// We need multiple call to MMAP
180	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
181	if (cq.ring_ptr == (void*)MAP_FAILED) {
182	munmap(sq.ring_ptr, sq.ring_sz);
183	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
184	}
185	}
186
187	// mmap the submit queue entries
188	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
189	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
190	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
191	munmap(sq.ring_ptr, sq.ring_sz);
192	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
193	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
194	}
195
196	// Step 3 : Initialize the data structure
197	// Get the pointers from the kernel to fill the structure
198	// submit queue
199	sq.kring.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
200	sq.kring.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
201	sq.kring.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
202	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
203	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
204	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
205	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
206
207	sq.kring.released = 0;
208
209	sq.free_ring.head = 0;
210	sq.free_ring.tail = *sq.num;
211	sq.free_ring.array = alloc( *sq.num, 128`align );
212	for(i; (__u32)*sq.num) {
213	sq.free_ring.array[i] = i;
214	}
215
216	sq.to_submit = 0;
217
218	// completion queue
219	cq.lock = false;
220	cq.id = MAX;
221	cq.ts = rdtscl();
222	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
223	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
224	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
225	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
226	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
227	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
228
229	#if !defined(CFA_WITH_IO_URING_IDLE)
230	// Step 4 : eventfd
231	// io_uring_register is so f*cking slow on some machine that it
232	// will never succeed if preemption isn't hard blocked
233	__cfadbg_print_safe(io_core, "Kernel I/O : registering %d for completion with ring %d\n", procfd, fd);
234
235	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &procfd, 1);
236	if (ret < 0) {
237	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
238	}
239
240	__cfadbg_print_safe(io_core, "Kernel I/O : registered %d for completion with ring %d\n", procfd, fd);
241	#endif
242
243	// some paranoid checks
244	/* paranoid / verifyf( (cq.mask) == ((cq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (cq.num) - 1ul32, cq.num, cq.mask );
245	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
246	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
247	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
248
249	/* paranoid / verifyf( (sq.mask) == ((sq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (sq.num) - 1ul32, sq.num, sq.mask );
250	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
251	/* paranoid / verifyf( (sq.kring.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.kring.head );
252	/* paranoid / verifyf( (sq.kring.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.kring.tail );
253
254	// Update the global ring info
255	this.ring_flags = 0;
256	this.fd = fd;
257	}
258
259	static void __io_uring_teardown( $io_context & this ) {
260	// Shutdown the io rings
261	struct __sub_ring_t & sq = this.sq;
262	struct __cmp_ring_t & cq = this.cq;
263	{
264	__u32 fhead = sq.free_ring.head;
265	__u32 ftail = sq.free_ring.tail;
266
267	__u32 total = *sq.num;
268	__u32 avail = ftail - fhead;
269
270	if(avail != total) abort \| "Processor (" \| (void*)this.proc \| ") tearing down ring with" \| (total - avail) \| "entries allocated but not submitted, out of" \| total;
271	}
272
273	// unmap the submit queue entries
274	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
275
276	// unmap the Submit Queue ring
277	munmap(sq.ring_ptr, sq.ring_sz);
278
279	// unmap the Completion Queue ring, if it is different
280	if (cq.ring_ptr != sq.ring_ptr) {
281	munmap(cq.ring_ptr, cq.ring_sz);
282	}
283
284	// close the file descriptor
285	close(this.fd);
286
287	free( this.sq.free_ring.array ); // Maybe null, doesn't matter
288	}
289
290	void __cfa_io_start( processor * proc ) {
291	proc->io.ctx = alloc();
292	(proc->io.ctx){proc, proc->cltr};
293	}
294	void __cfa_io_stop ( processor * proc ) {
295	^(*proc->io.ctx){};
296	free(proc->io.ctx);
297	}
298
299	//=============================================================================================
300	// I/O Context Sleep
301	//=============================================================================================
302	// static inline void __epoll_ctl($io_context & ctx, int op, const char * error) {
303	// struct epoll_event ev;
304	// ev.events = EPOLLIN \| EPOLLONESHOT;
305	// ev.data.u64 = (__u64)&ctx;
306	// int ret = epoll_ctl(iopoll.epollfd, op, ctx.efd, &ev);
307	// if (ret < 0) {
308	// abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
309	// }
310	// }
311
312	// static void __epoll_register($io_context & ctx) {
313	// __epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
314	// }
315
316	// static void __epoll_unregister($io_context & ctx) {
317	// // Read the current epoch so we know when to stop
318	// size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
319
320	// // Remove the fd from the iopoller
321	// __epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
322
323	// // Notify the io poller thread of the shutdown
324	// iopoll.run = false;
325	// sigval val = { 1 };
326	// pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
327
328	// // Make sure all this is done
329	// __atomic_thread_fence(__ATOMIC_SEQ_CST);
330
331	// // Wait for the next epoch
332	// while(curr == iopoll.epoch && !iopoll.stopped) Pause();
333	// }
334
335	// void __ioctx_prepare_block($io_context & ctx) {
336	// __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.fd, &ctx);
337	// __epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
338	// }
339
340
341	//=============================================================================================
342	// I/O Context Misc Setup
343	//=============================================================================================
344	void ?{}( $io_arbiter & this ) {
345	this.pending.empty = true;
346	}
347
348	void ^?{}( $io_arbiter & this ) {}
349
350	$io_arbiter * create(void) {
351	return new();
352	}
353	void destroy($io_arbiter * arbiter) {
354	delete(arbiter);
355	}
356
357	//=============================================================================================
358	// I/O Context Misc Setup
359	//=============================================================================================
360
361	#endif

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