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setup.cfa@ a5a6a1a8

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Last change on this file since a5a6a1a8 was 43784ac, checked in by Thierry Delisle <tdelisle@…>, 4 years ago
Changed libcfathread to consistently define _GNU_SOURCE
Property mode set to `100644`
File size: 11.9 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)
[f277633e]	28	void ?{}(io_context_params & this) {}
	29
[78da4ab]	30	void ?{}($io_context & this, struct cluster & cl) {}
	31	void ^?{}($io_context & this) {}
[3e2b9c9]	32
[f815c46]	33	void __cfa_io_start( processor * proc ) {}
	34	void __cfa_io_flush( processor * proc ) {}
	35	void __cfa_io_stop ( processor * proc ) {}
	36
[78da4ab]	37	$io_arbiter * create(void) { return 0p; }
	38	void destroy($io_arbiter *) {}
[b7664a03]	39
[3e2b9c9]	40	#else
	41	#include <errno.h>
	42	#include <stdint.h>
	43	#include <string.h>
	44	#include <signal.h>
	45	#include <unistd.h>
	46
	47	extern "C" {
	48	#include <pthread.h>
	49	#include <sys/epoll.h>
[426f60c]	50	#include <sys/eventfd.h>
[3e2b9c9]	51	#include <sys/mman.h>
	52	#include <sys/syscall.h>
	53
	54	#include <linux/io_uring.h>
	55	}
	56
	57	#include "bitmanip.hfa"
	58	#include "kernel_private.hfa"
	59	#include "thread.hfa"
	60
	61	void ?{}(io_context_params & this) {
	62	this.num_entries = 256;
	63	}
	64
	65	static void * __io_poller_slow( void * arg );
	66
	67	// Weirdly, some systems that do support io_uring don't actually define these
	68	#ifdef __alpha__
	69	/*
	70	* alpha is the only exception, all other architectures
	71	* have common numbers for new system calls.
	72	*/
	73	#ifndef __NR_io_uring_setup
	74	#define __NR_io_uring_setup 535
	75	#endif
	76	#ifndef __NR_io_uring_enter
	77	#define __NR_io_uring_enter 536
	78	#endif
	79	#ifndef __NR_io_uring_register
	80	#define __NR_io_uring_register 537
	81	#endif
	82	#else /* !__alpha__ */
	83	#ifndef __NR_io_uring_setup
	84	#define __NR_io_uring_setup 425
	85	#endif
	86	#ifndef __NR_io_uring_enter
	87	#define __NR_io_uring_enter 426
	88	#endif
	89	#ifndef __NR_io_uring_register
	90	#define __NR_io_uring_register 427
	91	#endif
	92	#endif
	93
	94	//=============================================================================================
[dddb3dd0]	95	// I/O Context Constrution/Destruction
[3e2b9c9]	96	//=============================================================================================
	97
	98
	99
[dddb3dd0]	100	static void __io_uring_setup ( $io_context & this, const io_context_params & params_in, int procfd );
[78da4ab]	101	static void __io_uring_teardown( $io_context & this );
	102	static void __epoll_register($io_context & ctx);
	103	static void __epoll_unregister($io_context & ctx);
	104	void __ioarbiter_register( $io_arbiter & mutex, $io_context & ctx );
	105	void __ioarbiter_unregister( $io_arbiter & mutex, $io_context & ctx );
[3e2b9c9]	106
[dddb3dd0]	107	void ?{}($io_context & this, processor * proc, struct cluster & cl) {
	108	/* paranoid */ verify( cl.io.arbiter );
	109	this.proc = proc;
	110	this.arbiter = cl.io.arbiter;
[78da4ab]	111	this.ext_sq.empty = true;
[11054eb]	112	(this.ext_sq.queue){};
[dddb3dd0]	113	__io_uring_setup( this, cl.io.params, proc->idle );
[78da4ab]	114	__cfadbg_print_safe(io_core, "Kernel I/O : Created ring for io_context %u (%p)\n", this.fd, &this);
[3e2b9c9]	115	}
	116
[dddb3dd0]	117	void ^?{}($io_context & this) {
[78da4ab]	118	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %u\n", this.fd);
[3e2b9c9]	119
[78da4ab]	120	__io_uring_teardown( this );
	121	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %u\n", this.fd);
	122	}
[3e2b9c9]	123
[7222630]	124	extern void __disable_interrupts_hard();
	125	extern void __enable_interrupts_hard();
[bb58825]	126
[dddb3dd0]	127	static void __io_uring_setup( $io_context & this, const io_context_params & params_in, int procfd ) {
[3e2b9c9]	128	// Step 1 : call to setup
	129	struct io_uring_params params;
	130	memset(&params, 0, sizeof(params));
[78da4ab]	131	// if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	132	// if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
[3e2b9c9]	133
[4998155]	134	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	135	if( !is_pow2(nentries) ) {
	136	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
	137	}
[3e2b9c9]	138
	139	int fd = syscall(__NR_io_uring_setup, nentries, &params );
	140	if(fd < 0) {
	141	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
	142	}
	143
	144	// Step 2 : mmap result
[78da4ab]	145	struct __sub_ring_t & sq = this.sq;
	146	struct __cmp_ring_t & cq = this.cq;
[3e2b9c9]	147
	148	// calculate the right ring size
	149	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
	150	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
	151
	152	// Requires features
	153	#if defined(IORING_FEAT_SINGLE_MMAP)
	154	// adjust the size according to the parameters
	155	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	156	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
	157	}
	158	#endif
	159
	160	// mmap the Submit Queue into existence
	161	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
	162	if (sq.ring_ptr == (void*)MAP_FAILED) {
	163	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
	164	}
	165
	166	// Requires features
	167	#if defined(IORING_FEAT_SINGLE_MMAP)
	168	// mmap the Completion Queue into existence (may or may not be needed)
	169	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	170	cq.ring_ptr = sq.ring_ptr;
	171	}
	172	else
	173	#endif
	174	{
	175	// We need multiple call to MMAP
	176	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
	177	if (cq.ring_ptr == (void*)MAP_FAILED) {
	178	munmap(sq.ring_ptr, sq.ring_sz);
	179	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
	180	}
	181	}
	182
	183	// mmap the submit queue entries
	184	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
	185	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
	186	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
	187	munmap(sq.ring_ptr, sq.ring_sz);
	188	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
	189	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
	190	}
	191
[426f60c]	192	// Step 3 : Initialize the data structure
[3e2b9c9]	193	// Get the pointers from the kernel to fill the structure
	194	// submit queue
[78da4ab]	195	sq.kring.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
	196	sq.kring.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
	197	sq.kring.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
	198	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
	199	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
	200	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
	201	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
	202
	203	sq.kring.released = 0;
	204
	205	sq.free_ring.head = 0;
	206	sq.free_ring.tail = *sq.num;
	207	sq.free_ring.array = alloc( *sq.num, 128`align );
	208	for(i; (__u32)*sq.num) {
	209	sq.free_ring.array[i] = i;
[3e2b9c9]	210	}
	211
[78da4ab]	212	sq.to_submit = 0;
[3e2b9c9]	213
	214	// completion queue
[4998155]	215	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
	216	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
	217	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
	218	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
	219	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
	220	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
[3e2b9c9]	221
[426f60c]	222	// Step 4 : eventfd
[bb58825]	223	// io_uring_register is so f*cking slow on some machine that it
	224	// will never succeed if preemption isn't hard blocked
[dddb3dd0]	225	__cfadbg_print_safe(io_core, "Kernel I/O : registering %d for completion with ring %d\n", procfd, fd);
[bb58825]	226
[dddb3dd0]	227	__disable_interrupts_hard();
[426f60c]	228
[dddb3dd0]	229	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &procfd, 1);
[bb58825]	230	if (ret < 0) {
	231	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
[426f60c]	232	}
	233
[7222630]	234	__enable_interrupts_hard();
[bb58825]	235
[dddb3dd0]	236	__cfadbg_print_safe(io_core, "Kernel I/O : registered %d for completion with ring %d\n", procfd, fd);
	237
[3e2b9c9]	238	// some paranoid checks
	239	/* 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 );
	240	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	241	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	242	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	243
	244	/* 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 );
	245	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
[78da4ab]	246	/* paranoid / verifyf( (sq.kring.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.kring.head );
	247	/* paranoid / verifyf( (sq.kring.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.kring.tail );
[3e2b9c9]	248
	249	// Update the global ring info
[78da4ab]	250	this.ring_flags = 0;
[3e2b9c9]	251	this.fd = fd;
	252	}
	253
[78da4ab]	254	static void __io_uring_teardown( $io_context & this ) {
[3e2b9c9]	255	// Shutdown the io rings
[78da4ab]	256	struct __sub_ring_t & sq = this.sq;
	257	struct __cmp_ring_t & cq = this.cq;
[3e2b9c9]	258
	259	// unmap the submit queue entries
	260	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	261
	262	// unmap the Submit Queue ring
	263	munmap(sq.ring_ptr, sq.ring_sz);
	264
	265	// unmap the Completion Queue ring, if it is different
	266	if (cq.ring_ptr != sq.ring_ptr) {
	267	munmap(cq.ring_ptr, cq.ring_sz);
	268	}
	269
	270	// close the file descriptor
	271	close(this.fd);
	272
[78da4ab]	273	free( this.sq.free_ring.array ); // Maybe null, doesn't matter
[3e2b9c9]	274	}
	275
[dddb3dd0]	276	void __cfa_io_start( processor * proc ) {
	277	proc->io.ctx = alloc();
	278	(proc->io.ctx){proc, proc->cltr};
	279	}
	280	void __cfa_io_stop ( processor * proc ) {
	281	^(*proc->io.ctx){};
	282	free(proc->io.ctx);
	283	}
	284
[3e2b9c9]	285	//=============================================================================================
	286	// I/O Context Sleep
	287	//=============================================================================================
[dddb3dd0]	288	// static inline void __epoll_ctl($io_context & ctx, int op, const char * error) {
	289	// struct epoll_event ev;
	290	// ev.events = EPOLLIN \| EPOLLONESHOT;
	291	// ev.data.u64 = (__u64)&ctx;
	292	// int ret = epoll_ctl(iopoll.epollfd, op, ctx.efd, &ev);
	293	// if (ret < 0) {
	294	// abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
	295	// }
	296	// }
[3e2b9c9]	297
[dddb3dd0]	298	// static void __epoll_register($io_context & ctx) {
	299	// __epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
	300	// }
[3e2b9c9]	301
[dddb3dd0]	302	// static void __epoll_unregister($io_context & ctx) {
	303	// // Read the current epoch so we know when to stop
	304	// size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
[d611995]	305
[dddb3dd0]	306	// // Remove the fd from the iopoller
	307	// __epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
[d611995]	308
[dddb3dd0]	309	// // Notify the io poller thread of the shutdown
	310	// iopoll.run = false;
	311	// sigval val = { 1 };
	312	// pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
[d611995]	313
[dddb3dd0]	314	// // Make sure all this is done
	315	// __atomic_thread_fence(__ATOMIC_SEQ_CST);
[d611995]	316
[dddb3dd0]	317	// // Wait for the next epoch
	318	// while(curr == iopoll.epoch && !iopoll.stopped) Pause();
	319	// }
[d611995]	320
[dddb3dd0]	321	// void __ioctx_prepare_block($io_context & ctx) {
	322	// __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.fd, &ctx);
	323	// __epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
	324	// }
[78da4ab]	325
	326
[3e2b9c9]	327	//=============================================================================================
	328	// I/O Context Misc Setup
	329	//=============================================================================================
[78da4ab]	330	void ?{}( $io_arbiter & this ) {
[11054eb]	331	this.pending.empty = true;
[78da4ab]	332	}
[3e2b9c9]	333
[11054eb]	334	void ^?{}( $io_arbiter & this ) {}
[3e2b9c9]	335
[78da4ab]	336	$io_arbiter * create(void) {
	337	return new();
[3e2b9c9]	338	}
[78da4ab]	339	void destroy($io_arbiter * arbiter) {
	340	delete(arbiter);
	341	}
	342
	343	//=============================================================================================
	344	// I/O Context Misc Setup
	345	//=============================================================================================
	346
[c44d652]	347	#endif

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