[ecf6b46] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // io.cfa -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Thu Apr 23 17:31:00 2020 |
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| 11 | // Last Modified By : |
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| 12 | // Last Modified On : |
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| 13 | // Update Count : |
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| 14 | // |
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| 15 | |
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[92976d9] | 16 | #include "kernel.hfa" |
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| 17 | |
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| 18 | #if !defined(HAVE_LINUX_IO_URING_H) |
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| 19 | void __kernel_io_startup( cluster & this ) { |
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| 20 | // Nothing to do without io_uring |
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| 21 | } |
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| 22 | |
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| 23 | void __kernel_io_shutdown( cluster & this ) { |
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| 24 | // Nothing to do without io_uring |
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| 25 | } |
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| 26 | |
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| 27 | #else |
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| 28 | extern "C" { |
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| 29 | #define _GNU_SOURCE /* See feature_test_macros(7) */ |
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| 30 | #include <errno.h> |
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| 31 | #include <stdint.h> |
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| 32 | #include <string.h> |
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| 33 | #include <unistd.h> |
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| 34 | #include <sys/mman.h> |
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| 35 | #include <sys/syscall.h> |
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| 36 | |
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| 37 | #include <linux/io_uring.h> |
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| 38 | } |
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| 39 | |
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| 40 | #include "bits/signal.hfa" |
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| 41 | #include "kernel_private.hfa" |
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| 42 | #include "thread.hfa" |
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| 43 | |
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| 44 | uint32_t entries_per_cluster() { |
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| 45 | return 256; |
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| 46 | } |
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| 47 | |
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| 48 | static void * __io_poller( void * arg ); |
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| 49 | |
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[185efe6] | 50 | // Weirdly, some systems that do support io_uring don't actually define these |
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| 51 | #ifdef __alpha__ |
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| 52 | /* |
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| 53 | * alpha is the only exception, all other architectures |
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| 54 | * have common numbers for new system calls. |
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| 55 | */ |
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| 56 | # ifndef __NR_io_uring_setup |
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| 57 | # define __NR_io_uring_setup 535 |
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| 58 | # endif |
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| 59 | # ifndef __NR_io_uring_enter |
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| 60 | # define __NR_io_uring_enter 536 |
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| 61 | # endif |
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| 62 | # ifndef __NR_io_uring_register |
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| 63 | # define __NR_io_uring_register 537 |
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| 64 | # endif |
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| 65 | #else /* !__alpha__ */ |
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| 66 | # ifndef __NR_io_uring_setup |
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| 67 | # define __NR_io_uring_setup 425 |
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| 68 | # endif |
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| 69 | # ifndef __NR_io_uring_enter |
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| 70 | # define __NR_io_uring_enter 426 |
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| 71 | # endif |
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| 72 | # ifndef __NR_io_uring_register |
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| 73 | # define __NR_io_uring_register 427 |
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| 74 | # endif |
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| 75 | #endif |
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| 76 | |
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| 77 | |
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[92976d9] | 78 | //============================================================================================= |
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| 79 | // I/O Startup / Shutdown logic |
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| 80 | //============================================================================================= |
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| 81 | void __kernel_io_startup( cluster & this ) { |
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| 82 | // Step 1 : call to setup |
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| 83 | struct io_uring_params params; |
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| 84 | memset(¶ms, 0, sizeof(params)); |
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| 85 | |
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[2d8f7b0] | 86 | uint32_t nentries = entries_per_cluster(); |
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| 87 | |
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| 88 | int fd = syscall(__NR_io_uring_setup, nentries, ¶ms ); |
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[92976d9] | 89 | if(fd < 0) { |
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| 90 | abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno)); |
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| 91 | } |
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| 92 | |
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| 93 | // Step 2 : mmap result |
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| 94 | memset(&this.io, 0, sizeof(struct io_ring)); |
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[2d8f7b0] | 95 | struct io_uring_sq & sq = this.io.submit_q; |
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| 96 | struct io_uring_cq & cq = this.io.completion_q; |
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[92976d9] | 97 | |
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| 98 | // calculate the right ring size |
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[2d8f7b0] | 99 | sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) ); |
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| 100 | cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe)); |
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[92976d9] | 101 | |
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| 102 | // Requires features |
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[d384787] | 103 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 104 | // adjust the size according to the parameters |
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| 105 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 106 | cq->ring_sz = sq->ring_sz = max(cq->ring_sz, sq->ring_sz); |
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| 107 | } |
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| 108 | #endif |
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[92976d9] | 109 | |
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| 110 | // mmap the Submit Queue into existence |
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[2d8f7b0] | 111 | sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQ_RING); |
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| 112 | if (sq.ring_ptr == (void*)MAP_FAILED) { |
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[92976d9] | 113 | abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno)); |
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| 114 | } |
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| 115 | |
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| 116 | // Requires features |
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[d384787] | 117 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 118 | // mmap the Completion Queue into existence (may or may not be needed) |
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| 119 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 120 | cq->ring_ptr = sq->ring_ptr; |
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| 121 | } |
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| 122 | else |
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| 123 | #endif |
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| 124 | { |
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[92976d9] | 125 | // We need multiple call to MMAP |
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[2d8f7b0] | 126 | cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING); |
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| 127 | if (cq.ring_ptr == (void*)MAP_FAILED) { |
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| 128 | munmap(sq.ring_ptr, sq.ring_sz); |
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[92976d9] | 129 | abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno)); |
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| 130 | } |
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[d384787] | 131 | } |
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[92976d9] | 132 | |
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| 133 | // mmap the submit queue entries |
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| 134 | size_t size = params.sq_entries * sizeof(struct io_uring_sqe); |
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[2d8f7b0] | 135 | sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQES); |
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| 136 | if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) { |
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| 137 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 138 | if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz); |
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[92976d9] | 139 | abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno)); |
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| 140 | } |
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| 141 | |
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| 142 | // Get the pointers from the kernel to fill the structure |
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| 143 | // submit queue |
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[2d8f7b0] | 144 | sq.head = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); |
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| 145 | sq.tail = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); |
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| 146 | sq.mask = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); |
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| 147 | sq.num = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); |
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| 148 | sq.flags = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); |
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| 149 | sq.dropped = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); |
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| 150 | sq.array = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); |
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| 151 | sq.alloc = *sq.tail; |
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[92976d9] | 152 | |
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| 153 | // completion queue |
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[2d8f7b0] | 154 | cq.head = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.head); |
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| 155 | cq.tail = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail); |
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| 156 | cq.mask = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask); |
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| 157 | cq.num = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries); |
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| 158 | cq.overflow = ( uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow); |
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| 159 | cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes); |
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| 160 | |
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| 161 | // some paranoid checks |
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| 162 | /* 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 ); |
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| 163 | /* paranoid */ verifyf( (*cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num ); |
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| 164 | /* paranoid */ verifyf( (*cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head ); |
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| 165 | /* paranoid */ verifyf( (*cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail ); |
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| 166 | |
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| 167 | /* 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 ); |
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| 168 | /* paranoid */ verifyf( (*sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num ); |
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| 169 | /* paranoid */ verifyf( (*sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head ); |
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| 170 | /* paranoid */ verifyf( (*sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail ); |
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[92976d9] | 171 | |
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| 172 | // Update the global ring info |
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| 173 | this.io.flags = params.flags; |
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| 174 | this.io.fd = fd; |
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| 175 | this.io.done = false; |
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[2d8f7b0] | 176 | (this.io.submit){ min(*sq.num, *cq.num) }; |
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[92976d9] | 177 | |
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[d384787] | 178 | // Initialize statistics |
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| 179 | this.io.submit_q.stats.submit_avg.val = 0; |
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| 180 | this.io.submit_q.stats.submit_avg.cnt = 0; |
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| 181 | this.io.completion_q.stats.completed_avg.val = 0; |
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| 182 | this.io.completion_q.stats.completed_avg.cnt = 0; |
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| 183 | |
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[92976d9] | 184 | // Create the poller thread |
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| 185 | this.io.stack = __create_pthread( &this.io.poller, __io_poller, &this ); |
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| 186 | } |
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| 187 | |
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| 188 | void __kernel_io_shutdown( cluster & this ) { |
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| 189 | // Stop the IO Poller |
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| 190 | // Notify the poller thread of the shutdown |
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| 191 | __atomic_store_n(&this.io.done, true, __ATOMIC_SEQ_CST); |
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| 192 | sigval val = { 1 }; |
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| 193 | pthread_sigqueue( this.io.poller, SIGUSR1, val ); |
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| 194 | |
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| 195 | // Wait for the poller thread to finish |
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| 196 | pthread_join( this.io.poller, 0p ); |
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| 197 | free( this.io.stack ); |
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| 198 | |
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[d384787] | 199 | // print statistics |
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| 200 | __cfaabi_bits_print_safe( STDERR_FILENO, |
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| 201 | "----- I/O uRing Stats -----\n" |
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| 202 | "- total submit calls : %llu\n" |
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| 203 | "- avg submit : %lf\n" |
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| 204 | "- total wait calls : %llu\n" |
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| 205 | "- avg completion/wait : %lf\n", |
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| 206 | this.io.submit_q.stats.submit_avg.cnt, |
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| 207 | ((double)this.io.submit_q.stats.submit_avg.val) / this.io.submit_q.stats.submit_avg.cnt, |
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| 208 | this.io.completion_q.stats.completed_avg.cnt, |
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| 209 | ((double)this.io.completion_q.stats.completed_avg.val) / this.io.completion_q.stats.completed_avg.cnt |
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| 210 | ); |
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| 211 | |
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[92976d9] | 212 | // Shutdown the io rings |
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| 213 | struct io_uring_sq & sq = this.io.submit_q; |
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| 214 | struct io_uring_cq & cq = this.io.completion_q; |
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| 215 | |
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| 216 | // unmap the submit queue entries |
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[2d8f7b0] | 217 | munmap(sq.sqes, (*sq.num) * sizeof(struct io_uring_sqe)); |
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[92976d9] | 218 | |
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| 219 | // unmap the Submit Queue ring |
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| 220 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 221 | |
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| 222 | // unmap the Completion Queue ring, if it is different |
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| 223 | if (cq.ring_ptr != sq.ring_ptr) { |
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| 224 | munmap(cq.ring_ptr, cq.ring_sz); |
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| 225 | } |
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| 226 | |
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| 227 | // close the file descriptor |
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| 228 | close(this.io.fd); |
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| 229 | } |
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| 230 | |
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| 231 | //============================================================================================= |
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| 232 | // I/O Polling |
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| 233 | //============================================================================================= |
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| 234 | struct io_user_data { |
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| 235 | int32_t result; |
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| 236 | $thread * thrd; |
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| 237 | }; |
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| 238 | |
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| 239 | // Process a single completion message from the io_uring |
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| 240 | // This is NOT thread-safe |
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[d384787] | 241 | int __drain_io( struct io_ring & ring, sigset_t & mask, int waitcnt ) { |
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| 242 | int ret = syscall( __NR_io_uring_enter, ring.fd, 0, waitcnt, IORING_ENTER_GETEVENTS, &mask, _NSIG / 8); |
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| 243 | if( ret < 0 ) { |
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| 244 | switch((int)errno) { |
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| 245 | case EAGAIN: |
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| 246 | case EINTR: |
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| 247 | return -EAGAIN; |
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| 248 | default: |
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| 249 | abort( "KERNEL ERROR: IO_URING WAIT - %s\n", strerror(errno) ); |
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| 250 | } |
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| 251 | } |
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| 252 | |
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| 253 | // Drain the queue |
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[92976d9] | 254 | unsigned head = *ring.completion_q.head; |
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| 255 | unsigned tail = __atomic_load_n(ring.completion_q.tail, __ATOMIC_ACQUIRE); |
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| 256 | |
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[d384787] | 257 | // Nothing was new return 0 |
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| 258 | if (head == tail) { |
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| 259 | ring.completion_q.stats.completed_avg.cnt += 1; |
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| 260 | return 0; |
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| 261 | } |
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[92976d9] | 262 | |
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[d384787] | 263 | uint32_t count = tail - head; |
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| 264 | for(i; count) { |
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| 265 | unsigned idx = (head + i) & (*ring.completion_q.mask); |
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| 266 | struct io_uring_cqe & cqe = ring.completion_q.cqes[idx]; |
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[92976d9] | 267 | |
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[d384787] | 268 | /* paranoid */ verify(&cqe); |
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[92976d9] | 269 | |
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[d384787] | 270 | struct io_user_data * data = (struct io_user_data *)cqe.user_data; |
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| 271 | // __cfaabi_bits_print_safe( STDERR_FILENO, "Performed reading io cqe %p, result %d for %p\n", data, cqe.res, data->thrd ); |
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[2d8f7b0] | 272 | |
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[d384787] | 273 | data->result = cqe.res; |
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| 274 | __unpark( data->thrd __cfaabi_dbg_ctx2 ); |
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| 275 | } |
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[2d8f7b0] | 276 | |
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| 277 | // Allow new submissions to happen |
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[d384787] | 278 | V(ring.submit, count); |
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[92976d9] | 279 | |
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| 280 | // Mark to the kernel that the cqe has been seen |
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| 281 | // Ensure that the kernel only sees the new value of the head index after the CQEs have been read. |
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[d384787] | 282 | __atomic_fetch_add( ring.completion_q.head, count, __ATOMIC_RELAXED ); |
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[92976d9] | 283 | |
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[d384787] | 284 | ring.completion_q.stats.completed_avg.val += count; |
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| 285 | ring.completion_q.stats.completed_avg.cnt += 1; |
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| 286 | |
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| 287 | return count; |
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[92976d9] | 288 | } |
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| 289 | |
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| 290 | static void * __io_poller( void * arg ) { |
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| 291 | cluster * cltr = (cluster *)arg; |
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| 292 | struct io_ring & ring = cltr->io; |
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| 293 | |
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| 294 | sigset_t mask; |
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| 295 | sigfillset(&mask); |
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| 296 | if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) { |
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| 297 | abort( "KERNEL ERROR: IO_URING - pthread_sigmask" ); |
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| 298 | } |
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| 299 | |
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| 300 | sigdelset( &mask, SIGUSR1 ); |
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| 301 | |
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| 302 | verify( (*ring.submit_q.head) == (*ring.submit_q.tail) ); |
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| 303 | verify( (*ring.completion_q.head) == (*ring.completion_q.tail) ); |
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| 304 | |
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[d384787] | 305 | while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) { |
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| 306 | __drain_io( ring, mask, 1 ); |
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[92976d9] | 307 | } |
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| 308 | |
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| 309 | return 0p; |
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| 310 | } |
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| 311 | |
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| 312 | //============================================================================================= |
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| 313 | // I/O Submissions |
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| 314 | //============================================================================================= |
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| 315 | |
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[2d8f7b0] | 316 | // Submition steps : |
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| 317 | // 1 - We need to make sure we don't overflow any of the buffer, P(ring.submit) to make sure |
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| 318 | // entries are available. The semaphore make sure that there is no more operations in |
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| 319 | // progress then the number of entries in the buffer. This probably limits concurrency |
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| 320 | // more than necessary since submitted but not completed operations don't need any |
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| 321 | // entries in user space. However, I don't know what happens if we overflow the buffers |
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| 322 | // because too many requests completed at once. This is a safe approach in all cases. |
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| 323 | // Furthermore, with hundreds of entries, this may be okay. |
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| 324 | // |
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| 325 | // 2 - Allocate a queue entry. The ring already has memory for all entries but only the ones |
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| 326 | // listed in sq.array are visible by the kernel. For those not listed, the kernel does not |
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| 327 | // offer any assurance that an entry is not being filled by multiple flags. Therefore, we |
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| 328 | // need to write an allocator that allows allocating concurrently. |
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| 329 | // |
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| 330 | // 3 - Actually fill the submit entry, this is the only simple and straightforward step. |
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| 331 | // |
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| 332 | // 4 - Append the entry index to the array and adjust the tail accordingly. This operation |
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| 333 | // needs to arrive to two concensus at the same time: |
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| 334 | // A - The order in which entries are listed in the array: no two threads must pick the |
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| 335 | // same index for their entries |
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| 336 | // B - When can the tail be update for the kernel. EVERY entries in the array between |
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| 337 | // head and tail must be fully filled and shouldn't ever be touched again. |
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| 338 | // |
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| 339 | |
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[2489d31] | 340 | static inline [* struct io_uring_sqe, uint32_t] __submit_alloc( struct io_ring & ring ) { |
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| 341 | // Wait for a spot to be available |
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| 342 | P(ring.submit); |
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| 343 | |
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| 344 | // Allocate the sqe |
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| 345 | uint32_t idx = __atomic_fetch_add(&ring.submit_q.alloc, 1ul32, __ATOMIC_SEQ_CST); |
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| 346 | |
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| 347 | // Validate that we didn't overflow anything |
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| 348 | // Check that nothing overflowed |
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| 349 | /* paranoid */ verify( true ); |
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| 350 | |
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| 351 | // Check that it goes head -> tail -> alloc and never head -> alloc -> tail |
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| 352 | /* paranoid */ verify( true ); |
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| 353 | |
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| 354 | // Return the sqe |
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| 355 | return [&ring.submit_q.sqes[ idx & (*ring.submit_q.mask)], idx]; |
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| 356 | } |
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| 357 | |
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| 358 | static inline void __submit( struct io_ring & ring, uint32_t idx ) { |
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| 359 | // get mutual exclusion |
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| 360 | lock(ring.submit_q.lock __cfaabi_dbg_ctx2); |
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| 361 | |
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| 362 | // Append to the list of ready entries |
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| 363 | uint32_t * tail = ring.submit_q.tail; |
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| 364 | const uint32_t mask = *ring.submit_q.mask; |
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| 365 | |
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| 366 | ring.submit_q.array[ (*tail) & mask ] = idx & mask; |
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| 367 | __atomic_fetch_add(tail, 1ul32, __ATOMIC_SEQ_CST); |
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| 368 | |
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| 369 | // Submit however, many entries need to be submitted |
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| 370 | int ret = syscall( __NR_io_uring_enter, ring.fd, 1, 0, 0, 0p, 0); |
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| 371 | // __cfaabi_bits_print_safe( STDERR_FILENO, "Performed io_submit, returned %d\n", ret ); |
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| 372 | if( ret < 0 ) { |
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| 373 | switch((int)errno) { |
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| 374 | default: |
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| 375 | abort( "KERNEL ERROR: IO_URING SUBMIT - %s\n", strerror(errno) ); |
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| 376 | } |
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[2d8f7b0] | 377 | } |
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[2489d31] | 378 | |
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[d384787] | 379 | ring.submit_q.stats.submit_avg.val += 1; |
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| 380 | ring.submit_q.stats.submit_avg.cnt += 1; |
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| 381 | |
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[2489d31] | 382 | unlock(ring.submit_q.lock); |
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| 383 | // Make sure that idx was submitted |
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| 384 | // Be careful to not get false positive if we cycled the entire list or that someone else submitted for us |
---|
| 385 | } |
---|
| 386 | |
---|
| 387 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd) { |
---|
| 388 | this.opcode = opcode; |
---|
| 389 | #if !defined(IOSQE_ASYNC) |
---|
| 390 | this.flags = 0; |
---|
| 391 | #else |
---|
| 392 | this.flags = IOSQE_ASYNC; |
---|
| 393 | #endif |
---|
| 394 | this.ioprio = 0; |
---|
| 395 | this.fd = fd; |
---|
| 396 | this.off = 0; |
---|
| 397 | this.addr = 0; |
---|
| 398 | this.len = 0; |
---|
| 399 | this.rw_flags = 0; |
---|
| 400 | this.__pad2[0] = this.__pad2[1] = this.__pad2[2] = 0; |
---|
[2d8f7b0] | 401 | } |
---|
| 402 | |
---|
[2489d31] | 403 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd, void * addr, uint32_t len, uint64_t off ) { |
---|
| 404 | (this){ opcode, fd }; |
---|
| 405 | this.off = off; |
---|
| 406 | this.addr = (uint64_t)addr; |
---|
| 407 | this.len = len; |
---|
| 408 | } |
---|
[ecf6b46] | 409 | #endif |
---|
[92976d9] | 410 | |
---|
| 411 | //============================================================================================= |
---|
| 412 | // I/O Interface |
---|
| 413 | //============================================================================================= |
---|
[ecf6b46] | 414 | #if defined(HAVE_LINUX_IO_URING_H) |
---|
[2d8f7b0] | 415 | #define __submit_prelude \ |
---|
| 416 | struct io_ring & ring = active_cluster()->io; \ |
---|
| 417 | struct io_uring_sqe * sqe; \ |
---|
| 418 | uint32_t idx; \ |
---|
| 419 | [sqe, idx] = __submit_alloc( ring ); |
---|
| 420 | |
---|
| 421 | #define __submit_wait \ |
---|
| 422 | io_user_data data = { 0, active_thread() }; \ |
---|
[185efe6] | 423 | /*__cfaabi_bits_print_safe( STDERR_FILENO, "Preparing user data %p for %p\n", &data, data.thrd );*/ \ |
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[2d8f7b0] | 424 | sqe->user_data = (uint64_t)&data; \ |
---|
| 425 | __submit( ring, idx ); \ |
---|
| 426 | park( __cfaabi_dbg_ctx ); \ |
---|
| 427 | return data.result; |
---|
[ecf6b46] | 428 | #endif |
---|
[2d8f7b0] | 429 | |
---|
[0ea6c5a] | 430 | // Some forward declarations |
---|
| 431 | extern "C" { |
---|
| 432 | #include <sys/types.h> |
---|
| 433 | struct iovec; |
---|
| 434 | extern ssize_t preadv2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
| 435 | extern ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
| 436 | |
---|
| 437 | extern int fsync(int fd); |
---|
| 438 | extern int sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags); |
---|
| 439 | |
---|
| 440 | struct msghdr; |
---|
| 441 | struct sockaddr; |
---|
| 442 | extern ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags); |
---|
| 443 | extern ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags); |
---|
| 444 | extern ssize_t send(int sockfd, const void *buf, size_t len, int flags); |
---|
| 445 | extern ssize_t recv(int sockfd, void *buf, size_t len, int flags); |
---|
| 446 | extern int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); |
---|
| 447 | extern int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen); |
---|
| 448 | |
---|
| 449 | extern int fallocate(int fd, int mode, uint64_t offset, uint64_t len); |
---|
| 450 | extern int posix_fadvise(int fd, uint64_t offset, uint64_t len, int advice); |
---|
| 451 | extern int madvise(void *addr, size_t length, int advice); |
---|
| 452 | |
---|
| 453 | extern int openat(int dirfd, const char *pathname, int flags, mode_t mode); |
---|
| 454 | extern int close(int fd); |
---|
| 455 | |
---|
| 456 | struct statx; |
---|
| 457 | extern int statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf); |
---|
| 458 | |
---|
| 459 | extern ssize_t read (int fd, void *buf, size_t count); |
---|
| 460 | } |
---|
| 461 | |
---|
[2d8f7b0] | 462 | //----------------------------------------------------------------------------- |
---|
| 463 | // Asynchronous operations |
---|
[ecf6b46] | 464 | ssize_t cfa_preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
| 465 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READV) |
---|
| 466 | return preadv2(fd, iov, iovcnt, offset, flags); |
---|
| 467 | #else |
---|
| 468 | __submit_prelude |
---|
| 469 | |
---|
| 470 | (*sqe){ IORING_OP_READV, fd, iov, iovcnt, offset }; |
---|
| 471 | |
---|
| 472 | __submit_wait |
---|
| 473 | #endif |
---|
| 474 | } |
---|
| 475 | |
---|
| 476 | ssize_t cfa_pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
| 477 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITEV) |
---|
| 478 | return pwritev2(fd, iov, iovcnt, offset, flags); |
---|
| 479 | #else |
---|
| 480 | __submit_prelude |
---|
| 481 | |
---|
| 482 | (*sqe){ IORING_OP_WRITEV, fd, iov, iovcnt, offset }; |
---|
| 483 | |
---|
| 484 | __submit_wait |
---|
| 485 | #endif |
---|
| 486 | } |
---|
| 487 | |
---|
| 488 | int cfa_fsync(int fd) { |
---|
| 489 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FSYNC) |
---|
| 490 | return fsync(fd); |
---|
| 491 | #else |
---|
| 492 | __submit_prelude |
---|
| 493 | |
---|
| 494 | (*sqe){ IORING_OP_FSYNC, fd }; |
---|
| 495 | |
---|
| 496 | __submit_wait |
---|
| 497 | #endif |
---|
| 498 | } |
---|
| 499 | |
---|
| 500 | int cfa_sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags) { |
---|
| 501 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SYNC_FILE_RANGE) |
---|
| 502 | return sync_file_range(fd, offset, nbytes, flags); |
---|
| 503 | #else |
---|
| 504 | __submit_prelude |
---|
| 505 | |
---|
| 506 | (*sqe){ IORING_OP_SYNC_FILE_RANGE, fd }; |
---|
| 507 | sqe->off = offset; |
---|
| 508 | sqe->len = nbytes; |
---|
| 509 | sqe->sync_range_flags = flags; |
---|
| 510 | |
---|
| 511 | __submit_wait |
---|
| 512 | #endif |
---|
| 513 | } |
---|
| 514 | |
---|
| 515 | |
---|
| 516 | ssize_t cfa_sendmsg(int sockfd, const struct msghdr *msg, int flags) { |
---|
| 517 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SENDMSG) |
---|
| 518 | return recv(sockfd, msg, flags); |
---|
| 519 | #else |
---|
| 520 | __submit_prelude |
---|
| 521 | |
---|
| 522 | (*sqe){ IORING_OP_SENDMSG, sockfd, msg, 1, 0 }; |
---|
| 523 | sqe->msg_flags = flags; |
---|
| 524 | |
---|
| 525 | __submit_wait |
---|
| 526 | #endif |
---|
| 527 | } |
---|
| 528 | |
---|
| 529 | ssize_t cfa_recvmsg(int sockfd, struct msghdr *msg, int flags) { |
---|
| 530 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECVMSG) |
---|
| 531 | return recv(sockfd, msg, flags); |
---|
| 532 | #else |
---|
| 533 | __submit_prelude |
---|
| 534 | |
---|
| 535 | (*sqe){ IORING_OP_RECVMSG, sockfd, msg, 1, 0 }; |
---|
| 536 | sqe->msg_flags = flags; |
---|
| 537 | |
---|
| 538 | __submit_wait |
---|
| 539 | #endif |
---|
| 540 | } |
---|
| 541 | |
---|
| 542 | ssize_t cfa_send(int sockfd, const void *buf, size_t len, int flags) { |
---|
| 543 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SEND) |
---|
| 544 | return send( sockfd, buf, len, flags ); |
---|
| 545 | #else |
---|
| 546 | __submit_prelude |
---|
| 547 | |
---|
| 548 | (*sqe){ IORING_OP_SEND, sockfd }; |
---|
| 549 | sqe->addr = (uint64_t)buf; |
---|
| 550 | sqe->len = len; |
---|
| 551 | sqe->msg_flags = flags; |
---|
| 552 | |
---|
| 553 | __submit_wait |
---|
| 554 | #endif |
---|
| 555 | } |
---|
| 556 | |
---|
| 557 | ssize_t cfa_recv(int sockfd, void *buf, size_t len, int flags) { |
---|
| 558 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECV) |
---|
| 559 | return recv( sockfd, buf, len, flags ); |
---|
| 560 | #else |
---|
| 561 | __submit_prelude |
---|
| 562 | |
---|
| 563 | (*sqe){ IORING_OP_RECV, sockfd }; |
---|
| 564 | sqe->addr = (uint64_t)buf; |
---|
| 565 | sqe->len = len; |
---|
| 566 | sqe->msg_flags = flags; |
---|
| 567 | |
---|
| 568 | __submit_wait |
---|
| 569 | #endif |
---|
| 570 | } |
---|
| 571 | |
---|
| 572 | int cfa_accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags) { |
---|
| 573 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_ACCEPT) |
---|
[0ea6c5a] | 574 | return accept4( sockfd, addr, addrlen, flags ); |
---|
[ecf6b46] | 575 | #else |
---|
| 576 | __submit_prelude |
---|
| 577 | |
---|
| 578 | (*sqe){ IORING_OP_ACCEPT, sockfd }; |
---|
| 579 | sqe->addr = addr; |
---|
| 580 | sqe->addr2 = addrlen; |
---|
| 581 | sqe->accept_flags = flags; |
---|
| 582 | |
---|
| 583 | __submit_wait |
---|
| 584 | #endif |
---|
| 585 | } |
---|
| 586 | |
---|
| 587 | int cfa_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) { |
---|
| 588 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CONNECT) |
---|
[0ea6c5a] | 589 | return connect( sockfd, addr, addrlen ); |
---|
[ecf6b46] | 590 | #else |
---|
| 591 | __submit_prelude |
---|
| 592 | |
---|
| 593 | (*sqe){ IORING_OP_CONNECT, sockfd }; |
---|
| 594 | sqe->addr = (uint64_t)addr; |
---|
| 595 | sqe->off = addrlen; |
---|
| 596 | |
---|
| 597 | __submit_wait |
---|
| 598 | #endif |
---|
| 599 | } |
---|
| 600 | |
---|
| 601 | int cfa_fallocate(int fd, int mode, uint64_t offset, uint64_t len) { |
---|
| 602 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FALLOCATE) |
---|
| 603 | return fallocate( fd, mode, offset, len ); |
---|
| 604 | #else |
---|
| 605 | __submit_prelude |
---|
| 606 | |
---|
| 607 | (*sqe){ IORING_OP_FALLOCATE, fd }; |
---|
| 608 | sqe->off = offset; |
---|
| 609 | sqe->len = length; |
---|
| 610 | sqe->mode = mode; |
---|
| 611 | |
---|
| 612 | __submit_wait |
---|
| 613 | #endif |
---|
| 614 | } |
---|
| 615 | |
---|
| 616 | int cfa_fadvise(int fd, uint64_t offset, uint64_t len, int advice) { |
---|
| 617 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FADVISE) |
---|
| 618 | return posix_fadvise( fd, offset, len, advice ); |
---|
| 619 | #else |
---|
| 620 | __submit_prelude |
---|
| 621 | |
---|
| 622 | (*sqe){ IORING_OP_FADVISE, fd }; |
---|
| 623 | sqe->off = (uint64_t)offset; |
---|
| 624 | sqe->len = length; |
---|
| 625 | sqe->fadvise_advice = advice; |
---|
| 626 | |
---|
| 627 | __submit_wait |
---|
| 628 | #endif |
---|
| 629 | } |
---|
| 630 | |
---|
| 631 | int cfa_madvise(void *addr, size_t length, int advice) { |
---|
| 632 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_MADVISE) |
---|
| 633 | return madvise( addr, length, advice ); |
---|
| 634 | #else |
---|
| 635 | __submit_prelude |
---|
| 636 | |
---|
| 637 | (*sqe){ IORING_OP_MADVISE, 0 }; |
---|
| 638 | sqe->addr = (uint64_t)addr; |
---|
| 639 | sqe->len = length; |
---|
| 640 | sqe->fadvise_advice = advice; |
---|
| 641 | |
---|
| 642 | __submit_wait |
---|
| 643 | #endif |
---|
| 644 | } |
---|
| 645 | |
---|
| 646 | int cfa_openat(int dirfd, const char *pathname, int flags, mode_t mode) { |
---|
| 647 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_OPENAT) |
---|
| 648 | return openat( dirfd, pathname, flags, mode ); |
---|
| 649 | #else |
---|
| 650 | __submit_prelude |
---|
| 651 | |
---|
| 652 | (*sqe){ IORING_OP_OPENAT, dirfd }; |
---|
| 653 | sqe->addr = (uint64_t)pathname; |
---|
| 654 | sqe->open_flags = flags; |
---|
| 655 | sqe->mode = mode; |
---|
| 656 | |
---|
| 657 | __submit_wait |
---|
| 658 | #endif |
---|
| 659 | } |
---|
| 660 | |
---|
| 661 | int cfa_close(int fd) { |
---|
| 662 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CLOSE) |
---|
| 663 | return close( fd ); |
---|
| 664 | #else |
---|
| 665 | __submit_prelude |
---|
| 666 | |
---|
| 667 | (*sqe){ IORING_OP_CLOSE, fd }; |
---|
| 668 | |
---|
| 669 | __submit_wait |
---|
| 670 | #endif |
---|
| 671 | } |
---|
| 672 | |
---|
| 673 | int cfa_statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf) { |
---|
| 674 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_STATX) |
---|
| 675 | //return statx( dirfd, pathname, flags, mask, statxbuf ); |
---|
| 676 | return syscall( __NR_io_uring_setup, dirfd, pathname, flags, mask, statxbuf ); |
---|
| 677 | #else |
---|
| 678 | __submit_prelude |
---|
| 679 | |
---|
| 680 | (*sqe){ IORING_OP_STATX, dirfd }; |
---|
| 681 | sqe->addr = (uint64_t)pathname; |
---|
| 682 | sqe->statx_flags = flags; |
---|
| 683 | sqe->len = mask; |
---|
| 684 | sqe->off = (uint64_t)statxbuf; |
---|
| 685 | |
---|
| 686 | __submit_wait |
---|
| 687 | #endif |
---|
| 688 | } |
---|
| 689 | |
---|
| 690 | |
---|
| 691 | ssize_t cfa_read(int fd, void *buf, size_t count) { |
---|
| 692 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READ) |
---|
| 693 | return read( fd, buf, count ); |
---|
| 694 | #else |
---|
| 695 | __submit_prelude |
---|
| 696 | |
---|
| 697 | (*sqe){ IORING_OP_READ, fd, buf, count, 0 }; |
---|
| 698 | |
---|
| 699 | __submit_wait |
---|
| 700 | #endif |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | ssize_t cfa_write(int fd, void *buf, size_t count) { |
---|
| 704 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITE) |
---|
| 705 | return read( fd, buf, count ); |
---|
| 706 | #else |
---|
| 707 | __submit_prelude |
---|
| 708 | |
---|
| 709 | (*sqe){ IORING_OP_WRITE, fd, buf, count, 0 }; |
---|
| 710 | |
---|
| 711 | __submit_wait |
---|
| 712 | #endif |
---|
| 713 | } |
---|
[2d8f7b0] | 714 | |
---|
| 715 | //----------------------------------------------------------------------------- |
---|
| 716 | // Check if a function is asynchronous |
---|
| 717 | |
---|
| 718 | // Macro magic to reduce the size of the following switch case |
---|
[ecf6b46] | 719 | #define IS_DEFINED_APPLY(f, ...) f(__VA_ARGS__) |
---|
| 720 | #define IS_DEFINED_SECOND(first, second, ...) second |
---|
| 721 | #define IS_DEFINED_TEST(expansion) _CFA_IO_FEATURE_##expansion |
---|
| 722 | #define IS_DEFINED(macro) IS_DEFINED_APPLY( IS_DEFINED_SECOND,IS_DEFINED_TEST(macro) false, true) |
---|
[2d8f7b0] | 723 | |
---|
[ecf6b46] | 724 | bool has_user_level_blocking( fptr_t func ) { |
---|
| 725 | #if defined(HAVE_LINUX_IO_URING_H) |
---|
[2d8f7b0] | 726 | if( /*func == (fptr_t)preadv2 || */ |
---|
[2489d31] | 727 | func == (fptr_t)cfa_preadv2 ) |
---|
[2d8f7b0] | 728 | #define _CFA_IO_FEATURE_IORING_OP_READV , |
---|
| 729 | return IS_DEFINED(IORING_OP_READV); |
---|
| 730 | |
---|
| 731 | if( /*func == (fptr_t)pwritev2 || */ |
---|
[ecf6b46] | 732 | func == (fptr_t)cfa_pwritev2 ) |
---|
[2d8f7b0] | 733 | #define _CFA_IO_FEATURE_IORING_OP_WRITEV , |
---|
| 734 | return IS_DEFINED(IORING_OP_WRITEV); |
---|
| 735 | |
---|
| 736 | if( /*func == (fptr_t)fsync || */ |
---|
[ecf6b46] | 737 | func == (fptr_t)cfa_fsync ) |
---|
[2d8f7b0] | 738 | #define _CFA_IO_FEATURE_IORING_OP_FSYNC , |
---|
| 739 | return IS_DEFINED(IORING_OP_FSYNC); |
---|
| 740 | |
---|
| 741 | if( /*func == (fptr_t)ync_file_range || */ |
---|
[ecf6b46] | 742 | func == (fptr_t)cfa_sync_file_range ) |
---|
[2d8f7b0] | 743 | #define _CFA_IO_FEATURE_IORING_OP_SYNC_FILE_RANGE , |
---|
| 744 | return IS_DEFINED(IORING_OP_SYNC_FILE_RANGE); |
---|
| 745 | |
---|
| 746 | if( /*func == (fptr_t)sendmsg || */ |
---|
[ecf6b46] | 747 | func == (fptr_t)cfa_sendmsg ) |
---|
[2d8f7b0] | 748 | #define _CFA_IO_FEATURE_IORING_OP_SENDMSG , |
---|
| 749 | return IS_DEFINED(IORING_OP_SENDMSG); |
---|
| 750 | |
---|
| 751 | if( /*func == (fptr_t)recvmsg || */ |
---|
[ecf6b46] | 752 | func == (fptr_t)cfa_recvmsg ) |
---|
[2d8f7b0] | 753 | #define _CFA_IO_FEATURE_IORING_OP_RECVMSG , |
---|
| 754 | return IS_DEFINED(IORING_OP_RECVMSG); |
---|
| 755 | |
---|
| 756 | if( /*func == (fptr_t)send || */ |
---|
[2489d31] | 757 | func == (fptr_t)cfa_send ) |
---|
[2d8f7b0] | 758 | #define _CFA_IO_FEATURE_IORING_OP_SEND , |
---|
| 759 | return IS_DEFINED(IORING_OP_SEND); |
---|
| 760 | |
---|
| 761 | if( /*func == (fptr_t)recv || */ |
---|
[2489d31] | 762 | func == (fptr_t)cfa_recv ) |
---|
[2d8f7b0] | 763 | #define _CFA_IO_FEATURE_IORING_OP_RECV , |
---|
| 764 | return IS_DEFINED(IORING_OP_RECV); |
---|
| 765 | |
---|
| 766 | if( /*func == (fptr_t)accept4 || */ |
---|
[2489d31] | 767 | func == (fptr_t)cfa_accept4 ) |
---|
[2d8f7b0] | 768 | #define _CFA_IO_FEATURE_IORING_OP_ACCEPT , |
---|
| 769 | return IS_DEFINED(IORING_OP_ACCEPT); |
---|
| 770 | |
---|
| 771 | if( /*func == (fptr_t)connect || */ |
---|
[2489d31] | 772 | func == (fptr_t)cfa_connect ) |
---|
[2d8f7b0] | 773 | #define _CFA_IO_FEATURE_IORING_OP_CONNECT , |
---|
| 774 | return IS_DEFINED(IORING_OP_CONNECT); |
---|
| 775 | |
---|
| 776 | if( /*func == (fptr_t)fallocate || */ |
---|
[2489d31] | 777 | func == (fptr_t)cfa_fallocate ) |
---|
[2d8f7b0] | 778 | #define _CFA_IO_FEATURE_IORING_OP_FALLOCATE , |
---|
| 779 | return IS_DEFINED(IORING_OP_FALLOCATE); |
---|
| 780 | |
---|
[0ea6c5a] | 781 | if( /*func == (fptr_t)posix_fadvise || */ |
---|
[2489d31] | 782 | func == (fptr_t)cfa_fadvise ) |
---|
[2d8f7b0] | 783 | #define _CFA_IO_FEATURE_IORING_OP_FADVISE , |
---|
| 784 | return IS_DEFINED(IORING_OP_FADVISE); |
---|
| 785 | |
---|
| 786 | if( /*func == (fptr_t)madvise || */ |
---|
[2489d31] | 787 | func == (fptr_t)cfa_madvise ) |
---|
[2d8f7b0] | 788 | #define _CFA_IO_FEATURE_IORING_OP_MADVISE , |
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| 789 | return IS_DEFINED(IORING_OP_MADVISE); |
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| 790 | |
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| 791 | if( /*func == (fptr_t)openat || */ |
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[2489d31] | 792 | func == (fptr_t)cfa_openat ) |
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[2d8f7b0] | 793 | #define _CFA_IO_FEATURE_IORING_OP_OPENAT , |
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| 794 | return IS_DEFINED(IORING_OP_OPENAT); |
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| 795 | |
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| 796 | if( /*func == (fptr_t)close || */ |
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[2489d31] | 797 | func == (fptr_t)cfa_close ) |
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[2d8f7b0] | 798 | #define _CFA_IO_FEATURE_IORING_OP_CLOSE , |
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| 799 | return IS_DEFINED(IORING_OP_CLOSE); |
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| 800 | |
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| 801 | if( /*func == (fptr_t)statx || */ |
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[2489d31] | 802 | func == (fptr_t)cfa_statx ) |
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[2d8f7b0] | 803 | #define _CFA_IO_FEATURE_IORING_OP_STATX , |
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| 804 | return IS_DEFINED(IORING_OP_STATX); |
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| 805 | |
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| 806 | if( /*func == (fptr_t)read || */ |
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[ecf6b46] | 807 | func == (fptr_t)cfa_read ) |
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[2d8f7b0] | 808 | #define _CFA_IO_FEATURE_IORING_OP_READ , |
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| 809 | return IS_DEFINED(IORING_OP_READ); |
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| 810 | |
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| 811 | if( /*func == (fptr_t)write || */ |
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[ecf6b46] | 812 | func == (fptr_t)cfa_write ) |
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[2d8f7b0] | 813 | #define _CFA_IO_FEATURE_IORING_OP_WRITE , |
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| 814 | return IS_DEFINED(IORING_OP_WRITE); |
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[ecf6b46] | 815 | #endif |
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[2d8f7b0] | 816 | |
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[ecf6b46] | 817 | return false; |
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| 818 | } |
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