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/types.hfa -- PRIVATE |
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8 | // Types used by the I/O subsystem |
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9 | // |
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10 | // Author : Thierry Delisle |
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11 | // Created On : Fri Jul 31 16:22:47 2020 |
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12 | // Last Modified By : |
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13 | // Last Modified On : |
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14 | // Update Count : |
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15 | // |
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16 | |
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17 | #pragma once |
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18 | |
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19 | extern "C" { |
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20 | #include <linux/types.h> |
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21 | } |
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22 | |
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23 | #include "bits/locks.hfa" |
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24 | #include "bits/queue.hfa" |
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25 | #include "iofwd.hfa" |
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26 | #include "kernel/fwd.hfa" |
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27 | |
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28 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
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29 | #include "bits/sequence.hfa" |
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30 | #include "monitor.hfa" |
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31 | |
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32 | struct processor; |
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33 | monitor $io_arbiter; |
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34 | |
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35 | //----------------------------------------------------------------------- |
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36 | // Ring Data structure |
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37 | struct __sub_ring_t { |
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38 | struct { |
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39 | // Head and tail of the ring (associated with array) |
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40 | volatile __u32 * head; // one passed last index consumed by the kernel |
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41 | volatile __u32 * tail; // one passed last index visible to the kernel |
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42 | volatile __u32 released; // one passed last index released back to the free list |
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43 | |
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44 | // The actual kernel ring which uses head/tail |
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45 | // indexes into the sqes arrays |
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46 | __u32 * array; |
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47 | } kring; |
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48 | |
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49 | struct { |
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50 | volatile __u32 head; |
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51 | volatile __u32 tail; |
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52 | // The ring which contains free allocations |
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53 | // indexes into the sqes arrays |
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54 | __u32 * array; |
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55 | } free_ring; |
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56 | |
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57 | // number of sqes to submit on next system call. |
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58 | __u32 to_submit; |
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59 | |
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60 | // number of entries and mask to go with it |
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61 | const __u32 * num; |
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62 | const __u32 * mask; |
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63 | |
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64 | // Submission flags, currently only IORING_SETUP_SQPOLL |
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65 | __u32 * flags; |
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66 | |
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67 | // number of sqes not submitted |
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68 | // From documentation : [dropped] is incremented for each invalid submission queue entry encountered in the ring buffer. |
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69 | __u32 * dropped; |
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70 | |
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71 | // A buffer of sqes (not the actual ring) |
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72 | struct io_uring_sqe * sqes; |
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73 | |
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74 | // The location and size of the mmaped area |
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75 | void * ring_ptr; |
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76 | size_t ring_sz; |
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77 | }; |
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78 | |
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79 | struct __cmp_ring_t { |
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80 | volatile bool lock; |
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81 | |
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82 | // Head and tail of the ring |
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83 | volatile __u32 * head; |
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84 | volatile __u32 * tail; |
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85 | |
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86 | // number of entries and mask to go with it |
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87 | const __u32 * mask; |
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88 | const __u32 * num; |
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89 | |
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90 | // I don't know what this value is for |
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91 | __u32 * overflow; |
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92 | |
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93 | // the kernel ring |
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94 | volatile struct io_uring_cqe * cqes; |
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95 | |
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96 | // The location and size of the mmaped area |
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97 | void * ring_ptr; |
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98 | size_t ring_sz; |
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99 | }; |
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100 | |
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101 | struct __outstanding_io { |
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102 | inline Colable; |
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103 | single_sem sem; |
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104 | }; |
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105 | static inline __outstanding_io *& Next( __outstanding_io * n ) { return (__outstanding_io *)Next( (Colable *)n ); } |
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106 | |
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107 | struct __outstanding_io_queue { |
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108 | __spinlock_t lock; |
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109 | Queue(__outstanding_io) queue; |
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110 | volatile bool empty; |
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111 | }; |
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112 | |
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113 | struct __external_io { |
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114 | inline __outstanding_io; |
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115 | __u32 * idxs; |
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116 | __u32 have; |
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117 | bool lazy; |
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118 | }; |
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119 | |
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120 | |
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121 | struct __attribute__((aligned(128))) $io_context { |
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122 | $io_arbiter * arbiter; |
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123 | processor * proc; |
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124 | |
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125 | __outstanding_io_queue ext_sq; |
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126 | |
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127 | struct __sub_ring_t sq; |
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128 | struct __cmp_ring_t cq; |
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129 | __u32 ring_flags; |
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130 | int fd; |
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131 | }; |
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132 | |
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133 | struct __pending_alloc { |
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134 | inline __outstanding_io; |
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135 | __u32 * idxs; |
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136 | __u32 want; |
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137 | $io_context * ctx; |
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138 | }; |
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139 | |
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140 | struct __attribute__((aligned(128))) $io_arbiter { |
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141 | __outstanding_io_queue pending; |
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142 | }; |
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143 | |
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144 | //----------------------------------------------------------------------- |
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145 | // Misc |
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146 | // Weirdly, some systems that do support io_uring don't actually define these |
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147 | #ifdef __alpha__ |
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148 | /* |
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149 | * alpha is the only exception, all other architectures |
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150 | * have common numbers for new system calls. |
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151 | */ |
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152 | #ifndef __NR_io_uring_setup |
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153 | #define __NR_io_uring_setup 535 |
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154 | #endif |
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155 | #ifndef __NR_io_uring_enter |
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156 | #define __NR_io_uring_enter 536 |
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157 | #endif |
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158 | #ifndef __NR_io_uring_register |
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159 | #define __NR_io_uring_register 537 |
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160 | #endif |
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161 | #else /* !__alpha__ */ |
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162 | #ifndef __NR_io_uring_setup |
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163 | #define __NR_io_uring_setup 425 |
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164 | #endif |
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165 | #ifndef __NR_io_uring_enter |
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166 | #define __NR_io_uring_enter 426 |
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167 | #endif |
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168 | #ifndef __NR_io_uring_register |
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169 | #define __NR_io_uring_register 427 |
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170 | #endif |
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171 | #endif |
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172 | |
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173 | // void __ioctx_prepare_block($io_context & ctx); |
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174 | #endif |
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