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ADT ast-experimental enum pthread-emulation qualifiedEnum

Last change on this file since f5bace8 was 78a580d, checked in by Thierry Delisle <tdelisle@…>, 4 years ago
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File size: 12.3 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)
[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 ) {}
[a986807]	34	bool __cfa_io_flush( processor * proc, int ) { return false; }
[f815c46]	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
[bfb9bf5]	41	#pragma GCC diagnostic push
	42	#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
[3e2b9c9]	43	#include <errno.h>
	44	#include <stdint.h>
	45	#include <string.h>
	46	#include <signal.h>
	47	#include <unistd.h>
	48
	49	extern "C" {
	50	#include <pthread.h>
	51	#include <sys/epoll.h>
[426f60c]	52	#include <sys/eventfd.h>
[3e2b9c9]	53	#include <sys/mman.h>
	54	#include <sys/syscall.h>
	55
	56	#include <linux/io_uring.h>
	57	}
	58
	59	#include "bitmanip.hfa"
[b0d0285]	60	#include "fstream.hfa"
[708ae38]	61	#include "kernel/private.hfa"
[78a580d]	62	#include "limits.hfa"
[3e2b9c9]	63	#include "thread.hfa"
[bfb9bf5]	64	#pragma GCC diagnostic pop
[3e2b9c9]	65
	66	void ?{}(io_context_params & this) {
	67	this.num_entries = 256;
	68	}
	69
	70	static void * __io_poller_slow( void * arg );
	71
	72	// Weirdly, some systems that do support io_uring don't actually define these
	73	#ifdef __alpha__
	74	/*
	75	* alpha is the only exception, all other architectures
	76	* have common numbers for new system calls.
	77	*/
	78	#ifndef __NR_io_uring_setup
	79	#define __NR_io_uring_setup 535
	80	#endif
	81	#ifndef __NR_io_uring_enter
	82	#define __NR_io_uring_enter 536
	83	#endif
	84	#ifndef __NR_io_uring_register
	85	#define __NR_io_uring_register 537
	86	#endif
	87	#else /* !__alpha__ */
	88	#ifndef __NR_io_uring_setup
	89	#define __NR_io_uring_setup 425
	90	#endif
	91	#ifndef __NR_io_uring_enter
	92	#define __NR_io_uring_enter 426
	93	#endif
	94	#ifndef __NR_io_uring_register
	95	#define __NR_io_uring_register 427
	96	#endif
	97	#endif
	98
	99	//=============================================================================================
[dddb3dd0]	100	// I/O Context Constrution/Destruction
[3e2b9c9]	101	//=============================================================================================
	102
	103
	104
[dddb3dd0]	105	static void __io_uring_setup ( $io_context & this, const io_context_params & params_in, int procfd );
[78da4ab]	106	static void __io_uring_teardown( $io_context & this );
	107	static void __epoll_register($io_context & ctx);
	108	static void __epoll_unregister($io_context & ctx);
	109	void __ioarbiter_register( $io_arbiter & mutex, $io_context & ctx );
	110	void __ioarbiter_unregister( $io_arbiter & mutex, $io_context & ctx );
[3e2b9c9]	111
[dddb3dd0]	112	void ?{}($io_context & this, processor * proc, struct cluster & cl) {
	113	/* paranoid */ verify( cl.io.arbiter );
	114	this.proc = proc;
	115	this.arbiter = cl.io.arbiter;
[78da4ab]	116	this.ext_sq.empty = true;
[11054eb]	117	(this.ext_sq.queue){};
[22226e4]	118	__io_uring_setup( this, cl.io.params, proc->idle_wctx.evfd );
[78da4ab]	119	__cfadbg_print_safe(io_core, "Kernel I/O : Created ring for io_context %u (%p)\n", this.fd, &this);
[3e2b9c9]	120	}
	121
[dddb3dd0]	122	void ^?{}($io_context & this) {
[78da4ab]	123	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %u\n", this.fd);
[3e2b9c9]	124
[78da4ab]	125	__io_uring_teardown( this );
	126	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %u\n", this.fd);
	127	}
[3e2b9c9]	128
[dddb3dd0]	129	static void __io_uring_setup( $io_context & this, const io_context_params & params_in, int procfd ) {
[3e2b9c9]	130	// Step 1 : call to setup
	131	struct io_uring_params params;
	132	memset(&params, 0, sizeof(params));
[78da4ab]	133	// if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	134	// if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
[3e2b9c9]	135
[4998155]	136	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	137	if( !is_pow2(nentries) ) {
	138	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
	139	}
[3e2b9c9]	140
	141	int fd = syscall(__NR_io_uring_setup, nentries, &params );
	142	if(fd < 0) {
	143	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
	144	}
	145
	146	// Step 2 : mmap result
[78da4ab]	147	struct __sub_ring_t & sq = this.sq;
	148	struct __cmp_ring_t & cq = this.cq;
[3e2b9c9]	149
	150	// calculate the right ring size
	151	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
	152	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
	153
	154	// Requires features
	155	#if defined(IORING_FEAT_SINGLE_MMAP)
	156	// adjust the size according to the parameters
	157	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	158	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
	159	}
	160	#endif
	161
	162	// mmap the Submit Queue into existence
	163	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
	164	if (sq.ring_ptr == (void*)MAP_FAILED) {
	165	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
	166	}
	167
	168	// Requires features
	169	#if defined(IORING_FEAT_SINGLE_MMAP)
	170	// mmap the Completion Queue into existence (may or may not be needed)
	171	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	172	cq.ring_ptr = sq.ring_ptr;
	173	}
	174	else
	175	#endif
	176	{
	177	// We need multiple call to MMAP
	178	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
	179	if (cq.ring_ptr == (void*)MAP_FAILED) {
	180	munmap(sq.ring_ptr, sq.ring_sz);
	181	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
	182	}
	183	}
	184
	185	// mmap the submit queue entries
	186	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
	187	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
	188	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
	189	munmap(sq.ring_ptr, sq.ring_sz);
	190	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
	191	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
	192	}
	193
[426f60c]	194	// Step 3 : Initialize the data structure
[3e2b9c9]	195	// Get the pointers from the kernel to fill the structure
	196	// submit queue
[78da4ab]	197	sq.kring.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
	198	sq.kring.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
	199	sq.kring.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
	200	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
	201	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
	202	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
	203	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
	204
	205	sq.kring.released = 0;
	206
	207	sq.free_ring.head = 0;
	208	sq.free_ring.tail = *sq.num;
	209	sq.free_ring.array = alloc( *sq.num, 128`align );
	210	for(i; (__u32)*sq.num) {
	211	sq.free_ring.array[i] = i;
[3e2b9c9]	212	}
	213
[78da4ab]	214	sq.to_submit = 0;
[3e2b9c9]	215
	216	// completion queue
[4ecc35a]	217	cq.lock = 0;
[78a580d]	218	cq.id = MAX;
	219	cq.ts = rdtscl();
[4998155]	220	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
	221	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
	222	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
	223	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
	224	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
	225	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
[3e2b9c9]	226
[d3605f8]	227	#if !defined(CFA_WITH_IO_URING_IDLE)
[7ef162b2]	228	// Step 4 : eventfd
	229	// io_uring_register is so f*cking slow on some machine that it
	230	// will never succeed if preemption isn't hard blocked
	231	__cfadbg_print_safe(io_core, "Kernel I/O : registering %d for completion with ring %d\n", procfd, fd);
[bb58825]	232
[7ef162b2]	233	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &procfd, 1);
	234	if (ret < 0) {
	235	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
	236	}
[426f60c]	237
[7ef162b2]	238	__cfadbg_print_safe(io_core, "Kernel I/O : registered %d for completion with ring %d\n", procfd, fd);
	239	#endif
[dddb3dd0]	240
[3e2b9c9]	241	// some paranoid checks
	242	/* 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 );
	243	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	244	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	245	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	246
	247	/* 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 );
	248	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
[78da4ab]	249	/* paranoid / verifyf( (sq.kring.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.kring.head );
	250	/* paranoid / verifyf( (sq.kring.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.kring.tail );
[3e2b9c9]	251
	252	// Update the global ring info
[78da4ab]	253	this.ring_flags = 0;
[3e2b9c9]	254	this.fd = fd;
	255	}
	256
[78da4ab]	257	static void __io_uring_teardown( $io_context & this ) {
[3e2b9c9]	258	// Shutdown the io rings
[78da4ab]	259	struct __sub_ring_t & sq = this.sq;
	260	struct __cmp_ring_t & cq = this.cq;
[b0d0285]	261	{
	262	__u32 fhead = sq.free_ring.head;
	263	__u32 ftail = sq.free_ring.tail;
	264
	265	__u32 total = *sq.num;
	266	__u32 avail = ftail - fhead;
	267
	268	if(avail != total) abort \| "Processor (" \| (void*)this.proc \| ") tearing down ring with" \| (total - avail) \| "entries allocated but not submitted, out of" \| total;
	269	}
[3e2b9c9]	270
	271	// unmap the submit queue entries
	272	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	273
	274	// unmap the Submit Queue ring
	275	munmap(sq.ring_ptr, sq.ring_sz);
	276
	277	// unmap the Completion Queue ring, if it is different
	278	if (cq.ring_ptr != sq.ring_ptr) {
	279	munmap(cq.ring_ptr, cq.ring_sz);
	280	}
	281
	282	// close the file descriptor
	283	close(this.fd);
	284
[78da4ab]	285	free( this.sq.free_ring.array ); // Maybe null, doesn't matter
[3e2b9c9]	286	}
	287
[dddb3dd0]	288	void __cfa_io_start( processor * proc ) {
	289	proc->io.ctx = alloc();
	290	(proc->io.ctx){proc, proc->cltr};
	291	}
	292	void __cfa_io_stop ( processor * proc ) {
	293	^(*proc->io.ctx){};
	294	free(proc->io.ctx);
	295	}
	296
[3e2b9c9]	297	//=============================================================================================
	298	// I/O Context Sleep
	299	//=============================================================================================
[dddb3dd0]	300	// static inline void __epoll_ctl($io_context & ctx, int op, const char * error) {
	301	// struct epoll_event ev;
	302	// ev.events = EPOLLIN \| EPOLLONESHOT;
	303	// ev.data.u64 = (__u64)&ctx;
	304	// int ret = epoll_ctl(iopoll.epollfd, op, ctx.efd, &ev);
	305	// if (ret < 0) {
	306	// abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
	307	// }
	308	// }
[3e2b9c9]	309
[dddb3dd0]	310	// static void __epoll_register($io_context & ctx) {
	311	// __epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
	312	// }
[3e2b9c9]	313
[dddb3dd0]	314	// static void __epoll_unregister($io_context & ctx) {
	315	// // Read the current epoch so we know when to stop
	316	// size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
[d611995]	317
[dddb3dd0]	318	// // Remove the fd from the iopoller
	319	// __epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
[d611995]	320
[dddb3dd0]	321	// // Notify the io poller thread of the shutdown
	322	// iopoll.run = false;
	323	// sigval val = { 1 };
	324	// pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
[d611995]	325
[dddb3dd0]	326	// // Make sure all this is done
	327	// __atomic_thread_fence(__ATOMIC_SEQ_CST);
[d611995]	328
[dddb3dd0]	329	// // Wait for the next epoch
	330	// while(curr == iopoll.epoch && !iopoll.stopped) Pause();
	331	// }
[d611995]	332
[dddb3dd0]	333	// void __ioctx_prepare_block($io_context & ctx) {
	334	// __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.fd, &ctx);
	335	// __epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
	336	// }
[78da4ab]	337
	338
[3e2b9c9]	339	//=============================================================================================
	340	// I/O Context Misc Setup
	341	//=============================================================================================
[78da4ab]	342	void ?{}( $io_arbiter & this ) {
[11054eb]	343	this.pending.empty = true;
[78da4ab]	344	}
[3e2b9c9]	345
[11054eb]	346	void ^?{}( $io_arbiter & this ) {}
[3e2b9c9]	347
[78da4ab]	348	$io_arbiter * create(void) {
	349	return new();
[3e2b9c9]	350	}
[78da4ab]	351	void destroy($io_arbiter * arbiter) {
	352	delete(arbiter);
	353	}
	354
	355	//=============================================================================================
	356	// I/O Context Misc Setup
	357	//=============================================================================================
	358
[c44d652]	359	#endif

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