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setup.cfa@ fa2e183

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Last change on this file since fa2e183 was 95dab9e, checked in by Thierry Delisle <tdelisle@…>, 3 years ago
Changed real_pthread symbols (now cfaabi_pthread) to be protected in libcfathread
Property mode set to `100644`
File size: 13.3 KB

Rev	Line
[3e2b9c9]	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__
[43784ac]	17	#define _GNU_SOURCE
[3e2b9c9]	18
[80444bb]	19	#if defined(__CFA_DEBUG__)
	20	// #define __CFA_DEBUG_PRINT_IO__
	21	// #define __CFA_DEBUG_PRINT_IO_CORE__
	22	#endif
	23
[3e2b9c9]	24	#include "io/types.hfa"
[c44d652]	25	#include "kernel.hfa"
[3e2b9c9]	26
	27	#if !defined(CFA_HAVE_LINUX_IO_URING_H)
[108345a]	28	void ?{}(io_context_params & this) libcfa_public {}
[f277633e]	29
[8bee858]	30	void ?{}(io_context$ & this, struct cluster & cl) {}
	31	void ^?{}(io_context$ & this) {}
[3e2b9c9]	32
[f815c46]	33	void __cfa_io_start( processor * proc ) {}
[18f7858]	34	bool __cfa_io_flush( processor * proc ) { return false; }
[7425720]	35	bool __cfa_io_drain( processor * proc ) __attribute__((nonnull (1))) { return false; }
	36	void __cfa_io_idle ( processor * ) __attribute__((nonnull (1))) {}
[f815c46]	37	void __cfa_io_stop ( processor * proc ) {}
	38
[8bee858]	39	io_arbiter$ * create(void) { return 0p; }
	40	void destroy(io_arbiter$ *) {}
[b7664a03]	41
[3e2b9c9]	42	#else
[bfb9bf5]	43	#pragma GCC diagnostic push
	44	#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
[3e2b9c9]	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>
[426f60c]	54	#include <sys/eventfd.h>
[3e2b9c9]	55	#include <sys/mman.h>
	56	#include <sys/syscall.h>
	57
	58	#include <linux/io_uring.h>
	59	}
	60
	61	#include "bitmanip.hfa"
[b0d0285]	62	#include "fstream.hfa"
[708ae38]	63	#include "kernel/private.hfa"
[78a580d]	64	#include "limits.hfa"
[3e2b9c9]	65	#include "thread.hfa"
[bfb9bf5]	66	#pragma GCC diagnostic pop
[3e2b9c9]	67
[108345a]	68	void ?{}(io_context_params & this) libcfa_public {
[3e2b9c9]	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	//=============================================================================================
[dddb3dd0]	102	// I/O Context Constrution/Destruction
[3e2b9c9]	103	//=============================================================================================
	104
	105
	106
[8bee858]	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 );
[3e2b9c9]	113
[8bee858]	114	void ?{}(io_context$ & this, processor * proc, struct cluster & cl) {
[dddb3dd0]	115	/* paranoid */ verify( cl.io.arbiter );
	116	this.proc = proc;
	117	this.arbiter = cl.io.arbiter;
[78da4ab]	118	this.ext_sq.empty = true;
[11054eb]	119	(this.ext_sq.queue){};
[22226e4]	120	__io_uring_setup( this, cl.io.params, proc->idle_wctx.evfd );
[78da4ab]	121	__cfadbg_print_safe(io_core, "Kernel I/O : Created ring for io_context %u (%p)\n", this.fd, &this);
[3e2b9c9]	122	}
	123
[8bee858]	124	void ^?{}(io_context$ & this) {
[78da4ab]	125	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %u\n", this.fd);
[3e2b9c9]	126
[78da4ab]	127	__io_uring_teardown( this );
	128	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %u\n", this.fd);
	129	}
[3e2b9c9]	130
[8bee858]	131	static void __io_uring_setup( io_context$ & this, const io_context_params & params_in, int procfd ) {
[3e2b9c9]	132	// Step 1 : call to setup
	133	struct io_uring_params params;
	134	memset(&params, 0, sizeof(params));
[78da4ab]	135	// if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	136	// if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
[3e2b9c9]	137
[4998155]	138	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	139	if( !is_pow2(nentries) ) {
[bf0263c]	140	abort("ERROR: I/O setup 'num_entries' must be a power of 2, was %u\n", nentries);
[63fe427c]	141	}
[3e2b9c9]	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
[78da4ab]	149	struct __sub_ring_t & sq = this.sq;
	150	struct __cmp_ring_t & cq = this.cq;
[3e2b9c9]	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
[426f60c]	196	// Step 3 : Initialize the data structure
[3e2b9c9]	197	// Get the pointers from the kernel to fill the structure
	198	// submit queue
[78da4ab]	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;
[3e2b9c9]	214	}
	215
[78da4ab]	216	sq.to_submit = 0;
[3e2b9c9]	217
	218	// completion queue
[18f7858]	219	cq.lock = false;
[78a580d]	220	cq.id = MAX;
	221	cq.ts = rdtscl();
[4998155]	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);
[3e2b9c9]	228
[d3605f8]	229	#if !defined(CFA_WITH_IO_URING_IDLE)
[19cb0cb]	230	{
[7ef162b2]	231	// Step 4 : eventfd
	232	__cfadbg_print_safe(io_core, "Kernel I/O : registering %d for completion with ring %d\n", procfd, fd);
[bb58825]	233
[7ef162b2]	234	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &procfd, 1);
	235	if (ret < 0) {
	236	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
	237	}
[426f60c]	238
[7ef162b2]	239	__cfadbg_print_safe(io_core, "Kernel I/O : registered %d for completion with ring %d\n", procfd, fd);
[19cb0cb]	240	}
[7ef162b2]	241	#endif
[dddb3dd0]	242
[19cb0cb]	243	// TODO: implement a proper version of this.
	244	// I have not found a better maximum that works in general but users should be able to configure it
	245	// the same way they configure other I/O options
[7ce8873]	246	// #if defined(CFA_HAVE_IORING_REGISTER_IOWQ_MAX_WORKERS)
[19cb0cb]	247	// {
[7ce8873]	248	// // Step 5 : max worker count
	249	// __cfadbg_print_safe(io_core, "Kernel I/O : lmiting max workers for ring %d\n", fd);
	250
	251	// unsigned int maxes[2];
	252	// maxes[0] = 64; // max number of bounded workers (Regular files / block)
	253	// maxes[1] = 64; // max number of unbounded workers (IOSQE_ASYNC)
	254	// int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_IOWQ_MAX_WORKERS, maxes, 2);
	255	// if (ret < 0) {
	256	// abort("KERNEL ERROR: IO_URING MAX WORKER REGISTER - %s\n", strerror(errno));
	257	// }
	258
	259	// __cfadbg_print_safe(io_core, "Kernel I/O : lmited max workers for ring %d\n", fd);
[19cb0cb]	260	// }
[7ce8873]	261	// #endif
	262
[3e2b9c9]	263	// some paranoid checks
	264	/* 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 );
	265	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	266	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	267	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	268
	269	/* 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 );
	270	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
[78da4ab]	271	/* paranoid / verifyf( (sq.kring.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.kring.head );
	272	/* paranoid / verifyf( (sq.kring.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.kring.tail );
[3e2b9c9]	273
	274	// Update the global ring info
[78da4ab]	275	this.ring_flags = 0;
[3e2b9c9]	276	this.fd = fd;
	277	}
	278
[8bee858]	279	static void __io_uring_teardown( io_context$ & this ) {
[3e2b9c9]	280	// Shutdown the io rings
[78da4ab]	281	struct __sub_ring_t & sq = this.sq;
	282	struct __cmp_ring_t & cq = this.cq;
[b0d0285]	283	{
	284	__u32 fhead = sq.free_ring.head;
	285	__u32 ftail = sq.free_ring.tail;
	286
	287	__u32 total = *sq.num;
	288	__u32 avail = ftail - fhead;
	289
	290	if(avail != total) abort \| "Processor (" \| (void*)this.proc \| ") tearing down ring with" \| (total - avail) \| "entries allocated but not submitted, out of" \| total;
	291	}
[3e2b9c9]	292
	293	// unmap the submit queue entries
	294	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	295
	296	// unmap the Submit Queue ring
	297	munmap(sq.ring_ptr, sq.ring_sz);
	298
	299	// unmap the Completion Queue ring, if it is different
	300	if (cq.ring_ptr != sq.ring_ptr) {
	301	munmap(cq.ring_ptr, cq.ring_sz);
	302	}
	303
	304	// close the file descriptor
	305	close(this.fd);
	306
[78da4ab]	307	free( this.sq.free_ring.array ); // Maybe null, doesn't matter
[3e2b9c9]	308	}
	309
[dddb3dd0]	310	void __cfa_io_start( processor * proc ) {
	311	proc->io.ctx = alloc();
	312	(proc->io.ctx){proc, proc->cltr};
	313	}
	314	void __cfa_io_stop ( processor * proc ) {
	315	^(*proc->io.ctx){};
	316	free(proc->io.ctx);
	317	}
	318
[3e2b9c9]	319	//=============================================================================================
	320	// I/O Context Sleep
	321	//=============================================================================================
[8bee858]	322	// static inline void __epoll_ctl(io_context$ & ctx, int op, const char * error) {
[dddb3dd0]	323	// struct epoll_event ev;
	324	// ev.events = EPOLLIN \| EPOLLONESHOT;
	325	// ev.data.u64 = (__u64)&ctx;
	326	// int ret = epoll_ctl(iopoll.epollfd, op, ctx.efd, &ev);
	327	// if (ret < 0) {
	328	// abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
	329	// }
	330	// }
[3e2b9c9]	331
[8bee858]	332	// static void __epoll_register(io_context$ & ctx) {
[dddb3dd0]	333	// __epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
	334	// }
[3e2b9c9]	335
[8bee858]	336	// static void __epoll_unregister(io_context$ & ctx) {
[dddb3dd0]	337	// // Read the current epoch so we know when to stop
	338	// size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
[d611995]	339
[dddb3dd0]	340	// // Remove the fd from the iopoller
	341	// __epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
[d611995]	342
[dddb3dd0]	343	// // Notify the io poller thread of the shutdown
	344	// iopoll.run = false;
	345	// sigval val = { 1 };
[95dab9e]	346	// __cfaabi_pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
[d611995]	347
[dddb3dd0]	348	// // Make sure all this is done
	349	// __atomic_thread_fence(__ATOMIC_SEQ_CST);
[d611995]	350
[dddb3dd0]	351	// // Wait for the next epoch
	352	// while(curr == iopoll.epoch && !iopoll.stopped) Pause();
	353	// }
[d611995]	354
[8bee858]	355	// void __ioctx_prepare_block(io_context$ & ctx) {
[dddb3dd0]	356	// __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.fd, &ctx);
	357	// __epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
	358	// }
[78da4ab]	359
	360
[3e2b9c9]	361	//=============================================================================================
	362	// I/O Context Misc Setup
	363	//=============================================================================================
[8bee858]	364	void ?{}( io_arbiter$ & this ) {
[11054eb]	365	this.pending.empty = true;
[78da4ab]	366	}
[3e2b9c9]	367
[8bee858]	368	void ^?{}( io_arbiter$ & mutex this ) {}
[3e2b9c9]	369
[8bee858]	370	io_arbiter$ * create(void) {
[78da4ab]	371	return new();
[3e2b9c9]	372	}
[8bee858]	373	void destroy(io_arbiter$ * arbiter) {
[78da4ab]	374	delete(arbiter);
	375	}
	376
	377	//=============================================================================================
	378	// I/O Context Misc Setup
	379	//=============================================================================================
	380
[c44d652]	381	#endif

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