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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16 | // #define __CFA_DEBUG_PRINT_IO__ |
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17 | // #define __CFA_DEBUG_PRINT_IO_CORE__ |
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18 | |
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19 | #include "kernel.hfa" |
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20 | |
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21 | #if !defined(HAVE_LINUX_IO_URING_H) |
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22 | void __kernel_io_startup( cluster & ) { |
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23 | // Nothing to do without io_uring |
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24 | } |
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25 | |
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26 | void __kernel_io_start_thrd( cluster & ) { |
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27 | // Nothing to do without io_uring |
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28 | } |
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29 | |
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30 | void __kernel_io_stop_thrd ( cluster & ) { |
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31 | // Nothing to do without io_uring |
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32 | } |
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33 | |
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34 | void __kernel_io_shutdown( cluster & ) { |
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35 | // Nothing to do without io_uring |
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36 | } |
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37 | |
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38 | #else |
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39 | extern "C" { |
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40 | #define _GNU_SOURCE /* See feature_test_macros(7) */ |
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41 | #include <errno.h> |
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42 | #include <stdint.h> |
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43 | #include <string.h> |
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44 | #include <unistd.h> |
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45 | #include <sys/mman.h> |
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46 | #include <sys/syscall.h> |
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47 | |
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48 | #include <linux/io_uring.h> |
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49 | } |
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50 | |
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51 | #include "bits/signal.hfa" |
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52 | #include "kernel_private.hfa" |
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53 | #include "thread.hfa" |
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54 | |
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55 | uint32_t entries_per_cluster() { |
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56 | return 256; |
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57 | } |
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58 | |
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59 | static void * __io_poller_slow( void * arg ); |
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60 | |
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61 | // Weirdly, some systems that do support io_uring don't actually define these |
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62 | #ifdef __alpha__ |
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63 | /* |
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64 | * alpha is the only exception, all other architectures |
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65 | * have common numbers for new system calls. |
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66 | */ |
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67 | #ifndef __NR_io_uring_setup |
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68 | #define __NR_io_uring_setup 535 |
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69 | #endif |
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70 | #ifndef __NR_io_uring_enter |
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71 | #define __NR_io_uring_enter 536 |
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72 | #endif |
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73 | #ifndef __NR_io_uring_register |
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74 | #define __NR_io_uring_register 537 |
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75 | #endif |
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76 | #else /* !__alpha__ */ |
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77 | #ifndef __NR_io_uring_setup |
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78 | #define __NR_io_uring_setup 425 |
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79 | #endif |
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80 | #ifndef __NR_io_uring_enter |
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81 | #define __NR_io_uring_enter 426 |
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82 | #endif |
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83 | #ifndef __NR_io_uring_register |
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84 | #define __NR_io_uring_register 427 |
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85 | #endif |
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86 | #endif |
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87 | |
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88 | #if defined(__CFA_IO_POLLING_USER__) |
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89 | void ?{}( __io_poller_fast & this, struct cluster & cltr ) { |
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90 | this.ring = &cltr.io; |
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91 | (this.thrd){ "Fast I/O Poller", cltr }; |
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92 | } |
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93 | void ^?{}( __io_poller_fast & mutex this ); |
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94 | void main( __io_poller_fast & this ); |
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95 | static inline $thread * get_thread( __io_poller_fast & this ) { return &this.thrd; } |
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96 | void ^?{}( __io_poller_fast & mutex this ) {} |
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97 | #endif |
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98 | |
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99 | //============================================================================================= |
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100 | // I/O Startup / Shutdown logic |
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101 | //============================================================================================= |
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102 | void __kernel_io_startup( cluster & this, bool main_cluster ) { |
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103 | // Step 1 : call to setup |
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104 | struct io_uring_params params; |
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105 | memset(¶ms, 0, sizeof(params)); |
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106 | |
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107 | uint32_t nentries = entries_per_cluster(); |
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108 | |
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109 | int fd = syscall(__NR_io_uring_setup, nentries, ¶ms ); |
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110 | if(fd < 0) { |
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111 | abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno)); |
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112 | } |
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113 | |
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114 | // Step 2 : mmap result |
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115 | memset(&this.io, 0, sizeof(struct io_ring)); |
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116 | struct io_uring_sq & sq = this.io.submit_q; |
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117 | struct io_uring_cq & cq = this.io.completion_q; |
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118 | |
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119 | // calculate the right ring size |
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120 | sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) ); |
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121 | cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe)); |
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122 | |
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123 | // Requires features |
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124 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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125 | // adjust the size according to the parameters |
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126 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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127 | cq->ring_sz = sq->ring_sz = max(cq->ring_sz, sq->ring_sz); |
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128 | } |
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129 | #endif |
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130 | |
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131 | // mmap the Submit Queue into existence |
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132 | 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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133 | if (sq.ring_ptr == (void*)MAP_FAILED) { |
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134 | abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno)); |
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135 | } |
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136 | |
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137 | // Requires features |
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138 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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139 | // mmap the Completion Queue into existence (may or may not be needed) |
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140 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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141 | cq->ring_ptr = sq->ring_ptr; |
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142 | } |
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143 | else |
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144 | #endif |
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145 | { |
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146 | // We need multiple call to MMAP |
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147 | 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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148 | if (cq.ring_ptr == (void*)MAP_FAILED) { |
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149 | munmap(sq.ring_ptr, sq.ring_sz); |
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150 | abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno)); |
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151 | } |
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152 | } |
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153 | |
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154 | // mmap the submit queue entries |
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155 | size_t size = params.sq_entries * sizeof(struct io_uring_sqe); |
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156 | 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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157 | if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) { |
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158 | munmap(sq.ring_ptr, sq.ring_sz); |
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159 | if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz); |
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160 | abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno)); |
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161 | } |
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162 | |
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163 | // Get the pointers from the kernel to fill the structure |
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164 | // submit queue |
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165 | sq.head = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); |
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166 | sq.tail = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); |
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167 | sq.mask = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); |
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168 | sq.num = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); |
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169 | sq.flags = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); |
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170 | sq.dropped = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); |
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171 | sq.array = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); |
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172 | sq.alloc = *sq.tail; |
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173 | sq.ready = *sq.tail; |
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174 | |
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175 | // completion queue |
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176 | cq.head = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.head); |
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177 | cq.tail = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail); |
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178 | cq.mask = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask); |
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179 | cq.num = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries); |
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180 | cq.overflow = ( uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow); |
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181 | cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes); |
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182 | |
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183 | // some paranoid checks |
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184 | /* 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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185 | /* paranoid */ verifyf( (*cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num ); |
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186 | /* paranoid */ verifyf( (*cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head ); |
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187 | /* paranoid */ verifyf( (*cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail ); |
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188 | |
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189 | /* 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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190 | /* paranoid */ verifyf( (*sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num ); |
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191 | /* paranoid */ verifyf( (*sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head ); |
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192 | /* paranoid */ verifyf( (*sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail ); |
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193 | |
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194 | // Update the global ring info |
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195 | this.io.flags = params.flags; |
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196 | this.io.fd = fd; |
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197 | this.io.done = false; |
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198 | (this.io.submit){ min(*sq.num, *cq.num) }; |
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199 | |
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200 | // Initialize statistics |
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201 | #if !defined(__CFA_NO_STATISTICS__) |
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202 | this.io.submit_q.stats.submit_avg.val = 0; |
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203 | this.io.submit_q.stats.submit_avg.cnt = 0; |
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204 | this.io.completion_q.stats.completed_avg.val = 0; |
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205 | this.io.completion_q.stats.completed_avg.cnt = 0; |
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206 | #endif |
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207 | |
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208 | if(!main_cluster) { |
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209 | __kernel_io_finish_start( this ); |
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210 | } |
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211 | } |
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212 | |
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213 | void __kernel_io_finish_start( cluster & this ) { |
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214 | #if defined(__CFA_IO_POLLING_USER__) |
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215 | __cfadbg_print_safe(io_core, "Kernel I/O : Creating fast poller for cluter %p\n", &this); |
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216 | (this.io.poller.fast){ this }; |
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217 | __thrd_start( this.io.poller.fast, main ); |
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218 | #endif |
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219 | |
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220 | // Create the poller thread |
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221 | __cfadbg_print_safe(io_core, "Kernel I/O : Creating slow poller for cluter %p\n", &this); |
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222 | this.io.poller.slow.stack = __create_pthread( &this.io.poller.slow.kthrd, __io_poller_slow, &this ); |
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223 | } |
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224 | |
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225 | void __kernel_io_prepare_stop( cluster & this ) { |
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226 | __cfadbg_print_safe(io_core, "Kernel I/O : Stopping pollers for cluster\n", &this); |
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227 | // Notify the poller thread of the shutdown |
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228 | __atomic_store_n(&this.io.done, true, __ATOMIC_SEQ_CST); |
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229 | |
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230 | // Stop the IO Poller |
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231 | sigval val = { 1 }; |
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232 | pthread_sigqueue( this.io.poller.slow.kthrd, SIGUSR1, val ); |
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233 | #if defined(__CFA_IO_POLLING_USER__) |
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234 | post( this.io.poller.sem ); |
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235 | #endif |
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236 | |
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237 | // Wait for the poller thread to finish |
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238 | pthread_join( this.io.poller.slow.kthrd, 0p ); |
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239 | free( this.io.poller.slow.stack ); |
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240 | |
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241 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller stopped for cluster\n", &this); |
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242 | |
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243 | #if defined(__CFA_IO_POLLING_USER__) |
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244 | // unpark the fast io_poller |
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245 | unpark( &this.io.poller.fast.thrd __cfaabi_dbg_ctx2 ); |
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246 | |
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247 | ^(this.io.poller.fast){}; |
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248 | |
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249 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller stopped for cluster\n", &this); |
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250 | #endif |
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251 | } |
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252 | |
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253 | void __kernel_io_shutdown( cluster & this, bool main_cluster ) { |
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254 | if(!main_cluster) { |
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255 | __kernel_io_prepare_stop( this ); |
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256 | } |
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257 | |
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258 | // print statistics |
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259 | #if !defined(__CFA_NO_STATISTICS__) |
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260 | if(this.print_stats) { |
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261 | __cfaabi_bits_print_safe( STDERR_FILENO, |
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262 | "----- I/O uRing Stats -----\n" |
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263 | "- total submit calls : %llu\n" |
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264 | "- avg submit : %lf\n" |
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265 | "- total wait calls : %llu\n" |
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266 | "- avg completion/wait : %lf\n", |
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267 | this.io.submit_q.stats.submit_avg.cnt, |
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268 | ((double)this.io.submit_q.stats.submit_avg.val) / this.io.submit_q.stats.submit_avg.cnt, |
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269 | this.io.completion_q.stats.completed_avg.cnt, |
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270 | ((double)this.io.completion_q.stats.completed_avg.val) / this.io.completion_q.stats.completed_avg.cnt |
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271 | ); |
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272 | } |
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273 | #endif |
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274 | |
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275 | // Shutdown the io rings |
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276 | struct io_uring_sq & sq = this.io.submit_q; |
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277 | struct io_uring_cq & cq = this.io.completion_q; |
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278 | |
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279 | // unmap the submit queue entries |
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280 | munmap(sq.sqes, (*sq.num) * sizeof(struct io_uring_sqe)); |
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281 | |
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282 | // unmap the Submit Queue ring |
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283 | munmap(sq.ring_ptr, sq.ring_sz); |
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284 | |
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285 | // unmap the Completion Queue ring, if it is different |
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286 | if (cq.ring_ptr != sq.ring_ptr) { |
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287 | munmap(cq.ring_ptr, cq.ring_sz); |
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288 | } |
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289 | |
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290 | // close the file descriptor |
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291 | close(this.io.fd); |
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292 | } |
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293 | |
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294 | //============================================================================================= |
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295 | // I/O Polling |
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296 | //============================================================================================= |
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297 | struct io_user_data { |
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298 | int32_t result; |
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299 | $thread * thrd; |
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300 | }; |
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301 | |
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302 | // Process a single completion message from the io_uring |
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303 | // This is NOT thread-safe |
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304 | static int __drain_io( struct io_ring & ring, sigset_t * mask, int waitcnt, bool in_kernel ) { |
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305 | int ret = syscall( __NR_io_uring_enter, ring.fd, 0, waitcnt, IORING_ENTER_GETEVENTS, mask, _NSIG / 8); |
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306 | if( ret < 0 ) { |
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307 | switch((int)errno) { |
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308 | case EAGAIN: |
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309 | case EINTR: |
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310 | return -EAGAIN; |
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311 | default: |
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312 | abort( "KERNEL ERROR: IO_URING WAIT - %s\n", strerror(errno) ); |
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313 | } |
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314 | } |
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315 | |
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316 | // Drain the queue |
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317 | unsigned head = *ring.completion_q.head; |
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318 | unsigned tail = __atomic_load_n(ring.completion_q.tail, __ATOMIC_ACQUIRE); |
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319 | |
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320 | // Nothing was new return 0 |
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321 | if (head == tail) { |
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322 | #if !defined(__CFA_NO_STATISTICS__) |
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323 | ring.completion_q.stats.completed_avg.cnt += 1; |
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324 | #endif |
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325 | return 0; |
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326 | } |
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327 | |
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328 | uint32_t count = tail - head; |
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329 | for(i; count) { |
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330 | unsigned idx = (head + i) & (*ring.completion_q.mask); |
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331 | struct io_uring_cqe & cqe = ring.completion_q.cqes[idx]; |
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332 | |
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333 | /* paranoid */ verify(&cqe); |
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334 | |
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335 | struct io_user_data * data = (struct io_user_data *)cqe.user_data; |
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336 | __cfadbg_print_safe( io, "Kernel I/O : Performed reading io cqe %p, result %d for %p\n", data, cqe.res, data->thrd ); |
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337 | |
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338 | data->result = cqe.res; |
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339 | if(!in_kernel) { unpark( data->thrd __cfaabi_dbg_ctx2 ); } |
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340 | else { __unpark( data->thrd __cfaabi_dbg_ctx2 ); } |
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341 | } |
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342 | |
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343 | // Allow new submissions to happen |
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344 | V(ring.submit, count); |
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345 | |
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346 | // Mark to the kernel that the cqe has been seen |
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347 | // Ensure that the kernel only sees the new value of the head index after the CQEs have been read. |
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348 | __atomic_fetch_add( ring.completion_q.head, count, __ATOMIC_RELAXED ); |
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349 | |
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350 | // Update statistics |
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351 | #if !defined(__CFA_NO_STATISTICS__) |
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352 | ring.completion_q.stats.completed_avg.val += count; |
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353 | ring.completion_q.stats.completed_avg.cnt += 1; |
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354 | #endif |
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355 | |
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356 | return count; |
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357 | } |
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358 | |
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359 | static void * __io_poller_slow( void * arg ) { |
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360 | cluster * cltr = (cluster *)arg; |
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361 | struct io_ring & ring = cltr->io; |
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362 | |
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363 | sigset_t mask; |
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364 | sigfillset(&mask); |
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365 | if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) { |
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366 | abort( "KERNEL ERROR: IO_URING - pthread_sigmask" ); |
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367 | } |
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368 | |
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369 | sigdelset( &mask, SIGUSR1 ); |
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370 | |
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371 | verify( (*ring.submit_q.head) == (*ring.submit_q.tail) ); |
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372 | verify( (*ring.completion_q.head) == (*ring.completion_q.tail) ); |
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373 | |
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374 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p ready\n", &ring); |
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375 | |
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376 | while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) { |
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377 | #if defined(__CFA_IO_POLLING_USER__) |
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378 | |
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379 | // In the user-thread approach drain and if anything was drained, |
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380 | // batton pass to the user-thread |
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381 | int count = __drain_io( ring, &mask, 1, true ); |
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382 | if(count > 0) { |
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383 | __cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to fast poller\n", &ring); |
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384 | __unpark( &ring.poller.fast.thrd __cfaabi_dbg_ctx2 ); |
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385 | wait( ring.poller.sem ); |
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386 | } |
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387 | |
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388 | #else |
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389 | |
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390 | //In the naive approach, just poll the io completion queue directly |
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391 | __drain_io( ring, &mask, 1, true ); |
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392 | |
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393 | #endif |
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394 | } |
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395 | |
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396 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p stopping\n", &ring); |
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397 | |
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398 | return 0p; |
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399 | } |
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400 | |
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401 | #if defined(__CFA_IO_POLLING_USER__) |
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402 | void main( __io_poller_fast & this ) { |
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403 | // Start parked |
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404 | park( __cfaabi_dbg_ctx ); |
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405 | |
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406 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p ready\n", &this.ring); |
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407 | |
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408 | // Then loop until we need to start |
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409 | while(!__atomic_load_n(&this.ring->done, __ATOMIC_SEQ_CST)) { |
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410 | // Drain the io |
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411 | if(0 > __drain_io( *this.ring, 0p, 0, false )) { |
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412 | // If we got something, just yield and check again |
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413 | yield(); |
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414 | } |
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415 | else { |
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416 | // We didn't get anything baton pass to the slow poller |
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417 | __cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to slow poller\n", &this.ring); |
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418 | post( this.ring->poller.sem ); |
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419 | park( __cfaabi_dbg_ctx ); |
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420 | } |
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421 | } |
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422 | |
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423 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p stopping\n", &this.ring); |
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424 | } |
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425 | #endif |
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426 | |
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427 | //============================================================================================= |
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428 | // I/O Submissions |
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429 | //============================================================================================= |
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430 | |
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431 | // Submition steps : |
---|
432 | // 1 - We need to make sure we don't overflow any of the buffer, P(ring.submit) to make sure |
---|
433 | // entries are available. The semaphore make sure that there is no more operations in |
---|
434 | // progress then the number of entries in the buffer. This probably limits concurrency |
---|
435 | // more than necessary since submitted but not completed operations don't need any |
---|
436 | // entries in user space. However, I don't know what happens if we overflow the buffers |
---|
437 | // because too many requests completed at once. This is a safe approach in all cases. |
---|
438 | // Furthermore, with hundreds of entries, this may be okay. |
---|
439 | // |
---|
440 | // 2 - Allocate a queue entry. The ring already has memory for all entries but only the ones |
---|
441 | // listed in sq.array are visible by the kernel. For those not listed, the kernel does not |
---|
442 | // offer any assurance that an entry is not being filled by multiple flags. Therefore, we |
---|
443 | // need to write an allocator that allows allocating concurrently. |
---|
444 | // |
---|
445 | // 3 - Actually fill the submit entry, this is the only simple and straightforward step. |
---|
446 | // |
---|
447 | // 4 - Append the entry index to the array and adjust the tail accordingly. This operation |
---|
448 | // needs to arrive to two concensus at the same time: |
---|
449 | // A - The order in which entries are listed in the array: no two threads must pick the |
---|
450 | // same index for their entries |
---|
451 | // B - When can the tail be update for the kernel. EVERY entries in the array between |
---|
452 | // head and tail must be fully filled and shouldn't ever be touched again. |
---|
453 | // |
---|
454 | |
---|
455 | static inline [* struct io_uring_sqe, uint32_t] __submit_alloc( struct io_ring & ring ) { |
---|
456 | // Wait for a spot to be available |
---|
457 | P(ring.submit); |
---|
458 | |
---|
459 | // Allocate the sqe |
---|
460 | uint32_t idx = __atomic_fetch_add(&ring.submit_q.alloc, 1ul32, __ATOMIC_SEQ_CST); |
---|
461 | |
---|
462 | // Validate that we didn't overflow anything |
---|
463 | // Check that nothing overflowed |
---|
464 | /* paranoid */ verify( true ); |
---|
465 | |
---|
466 | // Check that it goes head -> tail -> alloc and never head -> alloc -> tail |
---|
467 | /* paranoid */ verify( true ); |
---|
468 | |
---|
469 | // Return the sqe |
---|
470 | return [&ring.submit_q.sqes[ idx & (*ring.submit_q.mask)], idx]; |
---|
471 | } |
---|
472 | |
---|
473 | static inline void __submit( struct io_ring & ring, uint32_t idx ) { |
---|
474 | // get mutual exclusion |
---|
475 | lock(ring.submit_q.lock __cfaabi_dbg_ctx2); |
---|
476 | |
---|
477 | // Append to the list of ready entries |
---|
478 | uint32_t * tail = ring.submit_q.tail; |
---|
479 | const uint32_t mask = *ring.submit_q.mask; |
---|
480 | |
---|
481 | ring.submit_q.array[ (*tail) & mask ] = idx & mask; |
---|
482 | __atomic_fetch_add(tail, 1ul32, __ATOMIC_SEQ_CST); |
---|
483 | |
---|
484 | // Submit however, many entries need to be submitted |
---|
485 | int ret = syscall( __NR_io_uring_enter, ring.fd, 1, 0, 0, 0p, 0); |
---|
486 | if( ret < 0 ) { |
---|
487 | switch((int)errno) { |
---|
488 | default: |
---|
489 | abort( "KERNEL ERROR: IO_URING SUBMIT - %s\n", strerror(errno) ); |
---|
490 | } |
---|
491 | } |
---|
492 | |
---|
493 | // update statistics |
---|
494 | #if !defined(__CFA_NO_STATISTICS__) |
---|
495 | ring.submit_q.stats.submit_avg.val += 1; |
---|
496 | ring.submit_q.stats.submit_avg.cnt += 1; |
---|
497 | #endif |
---|
498 | |
---|
499 | unlock(ring.submit_q.lock); |
---|
500 | // Make sure that idx was submitted |
---|
501 | // Be careful to not get false positive if we cycled the entire list or that someone else submitted for us |
---|
502 | __cfadbg_print_safe( io, "Kernel I/O : Performed io_submit for %p, returned %d\n", active_thread(), ret ); |
---|
503 | } |
---|
504 | |
---|
505 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd) { |
---|
506 | this.opcode = opcode; |
---|
507 | #if !defined(IOSQE_ASYNC) |
---|
508 | this.flags = 0; |
---|
509 | #else |
---|
510 | this.flags = IOSQE_ASYNC; |
---|
511 | #endif |
---|
512 | this.ioprio = 0; |
---|
513 | this.fd = fd; |
---|
514 | this.off = 0; |
---|
515 | this.addr = 0; |
---|
516 | this.len = 0; |
---|
517 | this.rw_flags = 0; |
---|
518 | this.__pad2[0] = this.__pad2[1] = this.__pad2[2] = 0; |
---|
519 | } |
---|
520 | |
---|
521 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd, void * addr, uint32_t len, uint64_t off ) { |
---|
522 | (this){ opcode, fd }; |
---|
523 | this.off = off; |
---|
524 | this.addr = (uint64_t)addr; |
---|
525 | this.len = len; |
---|
526 | } |
---|
527 | |
---|
528 | |
---|
529 | //============================================================================================= |
---|
530 | // I/O Interface |
---|
531 | //============================================================================================= |
---|
532 | |
---|
533 | #define __submit_prelude \ |
---|
534 | struct io_ring & ring = active_cluster()->io; \ |
---|
535 | struct io_uring_sqe * sqe; \ |
---|
536 | uint32_t idx; \ |
---|
537 | [sqe, idx] = __submit_alloc( ring ); |
---|
538 | |
---|
539 | #define __submit_wait \ |
---|
540 | io_user_data data = { 0, active_thread() }; \ |
---|
541 | /*__cfaabi_bits_print_safe( STDERR_FILENO, "Preparing user data %p for %p\n", &data, data.thrd );*/ \ |
---|
542 | sqe->user_data = (uint64_t)&data; \ |
---|
543 | __submit( ring, idx ); \ |
---|
544 | park( __cfaabi_dbg_ctx ); \ |
---|
545 | return data.result; |
---|
546 | #endif |
---|
547 | |
---|
548 | // Some forward declarations |
---|
549 | extern "C" { |
---|
550 | #include <unistd.h> |
---|
551 | #include <sys/types.h> |
---|
552 | #include <sys/socket.h> |
---|
553 | #include <sys/syscall.h> |
---|
554 | struct iovec; |
---|
555 | extern ssize_t preadv2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
556 | extern ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
557 | |
---|
558 | extern int fsync(int fd); |
---|
559 | extern int sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags); |
---|
560 | |
---|
561 | struct msghdr; |
---|
562 | struct sockaddr; |
---|
563 | extern ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags); |
---|
564 | extern ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags); |
---|
565 | extern ssize_t send(int sockfd, const void *buf, size_t len, int flags); |
---|
566 | extern ssize_t recv(int sockfd, void *buf, size_t len, int flags); |
---|
567 | extern int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); |
---|
568 | extern int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen); |
---|
569 | |
---|
570 | extern int fallocate(int fd, int mode, uint64_t offset, uint64_t len); |
---|
571 | extern int posix_fadvise(int fd, uint64_t offset, uint64_t len, int advice); |
---|
572 | extern int madvise(void *addr, size_t length, int advice); |
---|
573 | |
---|
574 | extern int openat(int dirfd, const char *pathname, int flags, mode_t mode); |
---|
575 | extern int close(int fd); |
---|
576 | |
---|
577 | struct statx; |
---|
578 | extern int statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf); |
---|
579 | |
---|
580 | extern ssize_t read (int fd, void *buf, size_t count); |
---|
581 | } |
---|
582 | |
---|
583 | //----------------------------------------------------------------------------- |
---|
584 | // Asynchronous operations |
---|
585 | ssize_t cfa_preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
586 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READV) |
---|
587 | return preadv2(fd, iov, iovcnt, offset, flags); |
---|
588 | #else |
---|
589 | __submit_prelude |
---|
590 | |
---|
591 | (*sqe){ IORING_OP_READV, fd, iov, iovcnt, offset }; |
---|
592 | |
---|
593 | __submit_wait |
---|
594 | #endif |
---|
595 | } |
---|
596 | |
---|
597 | ssize_t cfa_pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
598 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITEV) |
---|
599 | return pwritev2(fd, iov, iovcnt, offset, flags); |
---|
600 | #else |
---|
601 | __submit_prelude |
---|
602 | |
---|
603 | (*sqe){ IORING_OP_WRITEV, fd, iov, iovcnt, offset }; |
---|
604 | |
---|
605 | __submit_wait |
---|
606 | #endif |
---|
607 | } |
---|
608 | |
---|
609 | int cfa_fsync(int fd) { |
---|
610 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FSYNC) |
---|
611 | return fsync(fd); |
---|
612 | #else |
---|
613 | __submit_prelude |
---|
614 | |
---|
615 | (*sqe){ IORING_OP_FSYNC, fd }; |
---|
616 | |
---|
617 | __submit_wait |
---|
618 | #endif |
---|
619 | } |
---|
620 | |
---|
621 | int cfa_sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags) { |
---|
622 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SYNC_FILE_RANGE) |
---|
623 | return sync_file_range(fd, offset, nbytes, flags); |
---|
624 | #else |
---|
625 | __submit_prelude |
---|
626 | |
---|
627 | (*sqe){ IORING_OP_SYNC_FILE_RANGE, fd }; |
---|
628 | sqe->off = offset; |
---|
629 | sqe->len = nbytes; |
---|
630 | sqe->sync_range_flags = flags; |
---|
631 | |
---|
632 | __submit_wait |
---|
633 | #endif |
---|
634 | } |
---|
635 | |
---|
636 | |
---|
637 | ssize_t cfa_sendmsg(int sockfd, const struct msghdr *msg, int flags) { |
---|
638 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SENDMSG) |
---|
639 | return sendmsg(sockfd, msg, flags); |
---|
640 | #else |
---|
641 | __submit_prelude |
---|
642 | |
---|
643 | (*sqe){ IORING_OP_SENDMSG, sockfd, msg, 1, 0 }; |
---|
644 | sqe->msg_flags = flags; |
---|
645 | |
---|
646 | __submit_wait |
---|
647 | #endif |
---|
648 | } |
---|
649 | |
---|
650 | ssize_t cfa_recvmsg(int sockfd, struct msghdr *msg, int flags) { |
---|
651 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECVMSG) |
---|
652 | return recvmsg(sockfd, msg, flags); |
---|
653 | #else |
---|
654 | __submit_prelude |
---|
655 | |
---|
656 | (*sqe){ IORING_OP_RECVMSG, sockfd, msg, 1, 0 }; |
---|
657 | sqe->msg_flags = flags; |
---|
658 | |
---|
659 | __submit_wait |
---|
660 | #endif |
---|
661 | } |
---|
662 | |
---|
663 | ssize_t cfa_send(int sockfd, const void *buf, size_t len, int flags) { |
---|
664 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SEND) |
---|
665 | return send( sockfd, buf, len, flags ); |
---|
666 | #else |
---|
667 | __submit_prelude |
---|
668 | |
---|
669 | (*sqe){ IORING_OP_SEND, sockfd }; |
---|
670 | sqe->addr = (uint64_t)buf; |
---|
671 | sqe->len = len; |
---|
672 | sqe->msg_flags = flags; |
---|
673 | |
---|
674 | __submit_wait |
---|
675 | #endif |
---|
676 | } |
---|
677 | |
---|
678 | ssize_t cfa_recv(int sockfd, void *buf, size_t len, int flags) { |
---|
679 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECV) |
---|
680 | return recv( sockfd, buf, len, flags ); |
---|
681 | #else |
---|
682 | __submit_prelude |
---|
683 | |
---|
684 | (*sqe){ IORING_OP_RECV, sockfd }; |
---|
685 | sqe->addr = (uint64_t)buf; |
---|
686 | sqe->len = len; |
---|
687 | sqe->msg_flags = flags; |
---|
688 | |
---|
689 | __submit_wait |
---|
690 | #endif |
---|
691 | } |
---|
692 | |
---|
693 | int cfa_accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags) { |
---|
694 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_ACCEPT) |
---|
695 | return accept4( sockfd, addr, addrlen, flags ); |
---|
696 | #else |
---|
697 | __submit_prelude |
---|
698 | |
---|
699 | (*sqe){ IORING_OP_ACCEPT, sockfd }; |
---|
700 | sqe->addr = addr; |
---|
701 | sqe->addr2 = addrlen; |
---|
702 | sqe->accept_flags = flags; |
---|
703 | |
---|
704 | __submit_wait |
---|
705 | #endif |
---|
706 | } |
---|
707 | |
---|
708 | int cfa_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) { |
---|
709 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CONNECT) |
---|
710 | return connect( sockfd, addr, addrlen ); |
---|
711 | #else |
---|
712 | __submit_prelude |
---|
713 | |
---|
714 | (*sqe){ IORING_OP_CONNECT, sockfd }; |
---|
715 | sqe->addr = (uint64_t)addr; |
---|
716 | sqe->off = addrlen; |
---|
717 | |
---|
718 | __submit_wait |
---|
719 | #endif |
---|
720 | } |
---|
721 | |
---|
722 | int cfa_fallocate(int fd, int mode, uint64_t offset, uint64_t len) { |
---|
723 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FALLOCATE) |
---|
724 | return fallocate( fd, mode, offset, len ); |
---|
725 | #else |
---|
726 | __submit_prelude |
---|
727 | |
---|
728 | (*sqe){ IORING_OP_FALLOCATE, fd }; |
---|
729 | sqe->off = offset; |
---|
730 | sqe->len = length; |
---|
731 | sqe->mode = mode; |
---|
732 | |
---|
733 | __submit_wait |
---|
734 | #endif |
---|
735 | } |
---|
736 | |
---|
737 | int cfa_fadvise(int fd, uint64_t offset, uint64_t len, int advice) { |
---|
738 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FADVISE) |
---|
739 | return posix_fadvise( fd, offset, len, advice ); |
---|
740 | #else |
---|
741 | __submit_prelude |
---|
742 | |
---|
743 | (*sqe){ IORING_OP_FADVISE, fd }; |
---|
744 | sqe->off = (uint64_t)offset; |
---|
745 | sqe->len = length; |
---|
746 | sqe->fadvise_advice = advice; |
---|
747 | |
---|
748 | __submit_wait |
---|
749 | #endif |
---|
750 | } |
---|
751 | |
---|
752 | int cfa_madvise(void *addr, size_t length, int advice) { |
---|
753 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_MADVISE) |
---|
754 | return madvise( addr, length, advice ); |
---|
755 | #else |
---|
756 | __submit_prelude |
---|
757 | |
---|
758 | (*sqe){ IORING_OP_MADVISE, 0 }; |
---|
759 | sqe->addr = (uint64_t)addr; |
---|
760 | sqe->len = length; |
---|
761 | sqe->fadvise_advice = advice; |
---|
762 | |
---|
763 | __submit_wait |
---|
764 | #endif |
---|
765 | } |
---|
766 | |
---|
767 | int cfa_openat(int dirfd, const char *pathname, int flags, mode_t mode) { |
---|
768 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_OPENAT) |
---|
769 | return openat( dirfd, pathname, flags, mode ); |
---|
770 | #else |
---|
771 | __submit_prelude |
---|
772 | |
---|
773 | (*sqe){ IORING_OP_OPENAT, dirfd }; |
---|
774 | sqe->addr = (uint64_t)pathname; |
---|
775 | sqe->open_flags = flags; |
---|
776 | sqe->mode = mode; |
---|
777 | |
---|
778 | __submit_wait |
---|
779 | #endif |
---|
780 | } |
---|
781 | |
---|
782 | int cfa_close(int fd) { |
---|
783 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CLOSE) |
---|
784 | return close( fd ); |
---|
785 | #else |
---|
786 | __submit_prelude |
---|
787 | |
---|
788 | (*sqe){ IORING_OP_CLOSE, fd }; |
---|
789 | |
---|
790 | __submit_wait |
---|
791 | #endif |
---|
792 | } |
---|
793 | |
---|
794 | int cfa_statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf) { |
---|
795 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_STATX) |
---|
796 | //return statx( dirfd, pathname, flags, mask, statxbuf ); |
---|
797 | return syscall( __NR_statx, dirfd, pathname, flags, mask, statxbuf ); |
---|
798 | #else |
---|
799 | __submit_prelude |
---|
800 | |
---|
801 | (*sqe){ IORING_OP_STATX, dirfd }; |
---|
802 | sqe->addr = (uint64_t)pathname; |
---|
803 | sqe->statx_flags = flags; |
---|
804 | sqe->len = mask; |
---|
805 | sqe->off = (uint64_t)statxbuf; |
---|
806 | |
---|
807 | __submit_wait |
---|
808 | #endif |
---|
809 | } |
---|
810 | |
---|
811 | |
---|
812 | ssize_t cfa_read(int fd, void *buf, size_t count) { |
---|
813 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READ) |
---|
814 | return read( fd, buf, count ); |
---|
815 | #else |
---|
816 | __submit_prelude |
---|
817 | |
---|
818 | (*sqe){ IORING_OP_READ, fd, buf, count, 0 }; |
---|
819 | |
---|
820 | __submit_wait |
---|
821 | #endif |
---|
822 | } |
---|
823 | |
---|
824 | ssize_t cfa_write(int fd, void *buf, size_t count) { |
---|
825 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITE) |
---|
826 | return read( fd, buf, count ); |
---|
827 | #else |
---|
828 | __submit_prelude |
---|
829 | |
---|
830 | (*sqe){ IORING_OP_WRITE, fd, buf, count, 0 }; |
---|
831 | |
---|
832 | __submit_wait |
---|
833 | #endif |
---|
834 | } |
---|
835 | |
---|
836 | //----------------------------------------------------------------------------- |
---|
837 | // Check if a function is asynchronous |
---|
838 | |
---|
839 | // Macro magic to reduce the size of the following switch case |
---|
840 | #define IS_DEFINED_APPLY(f, ...) f(__VA_ARGS__) |
---|
841 | #define IS_DEFINED_SECOND(first, second, ...) second |
---|
842 | #define IS_DEFINED_TEST(expansion) _CFA_IO_FEATURE_##expansion |
---|
843 | #define IS_DEFINED(macro) IS_DEFINED_APPLY( IS_DEFINED_SECOND,IS_DEFINED_TEST(macro) false, true) |
---|
844 | |
---|
845 | bool has_user_level_blocking( fptr_t func ) { |
---|
846 | #if defined(HAVE_LINUX_IO_URING_H) |
---|
847 | if( /*func == (fptr_t)preadv2 || */ |
---|
848 | func == (fptr_t)cfa_preadv2 ) |
---|
849 | #define _CFA_IO_FEATURE_IORING_OP_READV , |
---|
850 | return IS_DEFINED(IORING_OP_READV); |
---|
851 | |
---|
852 | if( /*func == (fptr_t)pwritev2 || */ |
---|
853 | func == (fptr_t)cfa_pwritev2 ) |
---|
854 | #define _CFA_IO_FEATURE_IORING_OP_WRITEV , |
---|
855 | return IS_DEFINED(IORING_OP_WRITEV); |
---|
856 | |
---|
857 | if( /*func == (fptr_t)fsync || */ |
---|
858 | func == (fptr_t)cfa_fsync ) |
---|
859 | #define _CFA_IO_FEATURE_IORING_OP_FSYNC , |
---|
860 | return IS_DEFINED(IORING_OP_FSYNC); |
---|
861 | |
---|
862 | if( /*func == (fptr_t)ync_file_range || */ |
---|
863 | func == (fptr_t)cfa_sync_file_range ) |
---|
864 | #define _CFA_IO_FEATURE_IORING_OP_SYNC_FILE_RANGE , |
---|
865 | return IS_DEFINED(IORING_OP_SYNC_FILE_RANGE); |
---|
866 | |
---|
867 | if( /*func == (fptr_t)sendmsg || */ |
---|
868 | func == (fptr_t)cfa_sendmsg ) |
---|
869 | #define _CFA_IO_FEATURE_IORING_OP_SENDMSG , |
---|
870 | return IS_DEFINED(IORING_OP_SENDMSG); |
---|
871 | |
---|
872 | if( /*func == (fptr_t)recvmsg || */ |
---|
873 | func == (fptr_t)cfa_recvmsg ) |
---|
874 | #define _CFA_IO_FEATURE_IORING_OP_RECVMSG , |
---|
875 | return IS_DEFINED(IORING_OP_RECVMSG); |
---|
876 | |
---|
877 | if( /*func == (fptr_t)send || */ |
---|
878 | func == (fptr_t)cfa_send ) |
---|
879 | #define _CFA_IO_FEATURE_IORING_OP_SEND , |
---|
880 | return IS_DEFINED(IORING_OP_SEND); |
---|
881 | |
---|
882 | if( /*func == (fptr_t)recv || */ |
---|
883 | func == (fptr_t)cfa_recv ) |
---|
884 | #define _CFA_IO_FEATURE_IORING_OP_RECV , |
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885 | return IS_DEFINED(IORING_OP_RECV); |
---|
886 | |
---|
887 | if( /*func == (fptr_t)accept4 || */ |
---|
888 | func == (fptr_t)cfa_accept4 ) |
---|
889 | #define _CFA_IO_FEATURE_IORING_OP_ACCEPT , |
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890 | return IS_DEFINED(IORING_OP_ACCEPT); |
---|
891 | |
---|
892 | if( /*func == (fptr_t)connect || */ |
---|
893 | func == (fptr_t)cfa_connect ) |
---|
894 | #define _CFA_IO_FEATURE_IORING_OP_CONNECT , |
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895 | return IS_DEFINED(IORING_OP_CONNECT); |
---|
896 | |
---|
897 | if( /*func == (fptr_t)fallocate || */ |
---|
898 | func == (fptr_t)cfa_fallocate ) |
---|
899 | #define _CFA_IO_FEATURE_IORING_OP_FALLOCATE , |
---|
900 | return IS_DEFINED(IORING_OP_FALLOCATE); |
---|
901 | |
---|
902 | if( /*func == (fptr_t)posix_fadvise || */ |
---|
903 | func == (fptr_t)cfa_fadvise ) |
---|
904 | #define _CFA_IO_FEATURE_IORING_OP_FADVISE , |
---|
905 | return IS_DEFINED(IORING_OP_FADVISE); |
---|
906 | |
---|
907 | if( /*func == (fptr_t)madvise || */ |
---|
908 | func == (fptr_t)cfa_madvise ) |
---|
909 | #define _CFA_IO_FEATURE_IORING_OP_MADVISE , |
---|
910 | return IS_DEFINED(IORING_OP_MADVISE); |
---|
911 | |
---|
912 | if( /*func == (fptr_t)openat || */ |
---|
913 | func == (fptr_t)cfa_openat ) |
---|
914 | #define _CFA_IO_FEATURE_IORING_OP_OPENAT , |
---|
915 | return IS_DEFINED(IORING_OP_OPENAT); |
---|
916 | |
---|
917 | if( /*func == (fptr_t)close || */ |
---|
918 | func == (fptr_t)cfa_close ) |
---|
919 | #define _CFA_IO_FEATURE_IORING_OP_CLOSE , |
---|
920 | return IS_DEFINED(IORING_OP_CLOSE); |
---|
921 | |
---|
922 | if( /*func == (fptr_t)statx || */ |
---|
923 | func == (fptr_t)cfa_statx ) |
---|
924 | #define _CFA_IO_FEATURE_IORING_OP_STATX , |
---|
925 | return IS_DEFINED(IORING_OP_STATX); |
---|
926 | |
---|
927 | if( /*func == (fptr_t)read || */ |
---|
928 | func == (fptr_t)cfa_read ) |
---|
929 | #define _CFA_IO_FEATURE_IORING_OP_READ , |
---|
930 | return IS_DEFINED(IORING_OP_READ); |
---|
931 | |
---|
932 | if( /*func == (fptr_t)write || */ |
---|
933 | func == (fptr_t)cfa_write ) |
---|
934 | #define _CFA_IO_FEATURE_IORING_OP_WRITE , |
---|
935 | return IS_DEFINED(IORING_OP_WRITE); |
---|
936 | #endif |
---|
937 | |
---|
938 | return false; |
---|
939 | } |
---|