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 "kernel/fwd.hfa" |
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25 | |
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26 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
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27 | #define LEADER_LOCK |
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28 | struct __leaderlock_t { |
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29 | struct $thread * volatile value; // ($thread) next_leader | (bool:1) is_locked |
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30 | }; |
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31 | |
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32 | static inline void ?{}( __leaderlock_t & this ) { this.value = 0p; } |
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33 | |
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34 | //----------------------------------------------------------------------- |
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35 | // Ring Data structure |
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36 | struct __submition_data { |
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37 | // Head and tail of the ring (associated with array) |
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38 | volatile __u32 * head; |
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39 | volatile __u32 * tail; |
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40 | volatile __u32 prev_head; |
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41 | |
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42 | // The actual kernel ring which uses head/tail |
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43 | // indexes into the sqes arrays |
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44 | __u32 * array; |
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45 | |
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46 | // number of entries and mask to go with it |
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47 | const __u32 * num; |
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48 | const __u32 * mask; |
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49 | |
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50 | // Submission flags (Not sure what for) |
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51 | __u32 * flags; |
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52 | |
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53 | // number of sqes not submitted (whatever that means) |
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54 | __u32 * dropped; |
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55 | |
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56 | // Like head/tail but not seen by the kernel |
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57 | volatile __u32 * ready; |
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58 | __u32 ready_cnt; |
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59 | __u32 prev_ready; |
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60 | |
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61 | #if defined(LEADER_LOCK) |
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62 | __leaderlock_t submit_lock; |
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63 | #else |
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64 | __spinlock_t submit_lock; |
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65 | #endif |
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66 | __spinlock_t release_lock; |
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67 | |
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68 | // A buffer of sqes (not the actual ring) |
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69 | volatile struct io_uring_sqe * sqes; |
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70 | |
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71 | // The location and size of the mmaped area |
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72 | void * ring_ptr; |
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73 | size_t ring_sz; |
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74 | }; |
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75 | |
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76 | struct __completion_data { |
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77 | // Head and tail of the ring |
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78 | volatile __u32 * head; |
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79 | volatile __u32 * tail; |
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80 | |
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81 | // number of entries and mask to go with it |
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82 | const __u32 * mask; |
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83 | const __u32 * num; |
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84 | |
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85 | // number of cqes not submitted (whatever that means) |
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86 | __u32 * overflow; |
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87 | |
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88 | // the kernel ring |
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89 | volatile struct io_uring_cqe * cqes; |
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90 | |
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91 | // The location and size of the mmaped area |
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92 | void * ring_ptr; |
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93 | size_t ring_sz; |
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94 | }; |
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95 | |
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96 | struct __io_data { |
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97 | struct __submition_data submit_q; |
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98 | struct __completion_data completion_q; |
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99 | __u32 ring_flags; |
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100 | int fd; |
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101 | int efd; |
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102 | bool eager_submits:1; |
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103 | bool poller_submits:1; |
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104 | }; |
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105 | |
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106 | //----------------------------------------------------------------------- |
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107 | // Misc |
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108 | // Weirdly, some systems that do support io_uring don't actually define these |
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109 | #ifdef __alpha__ |
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110 | /* |
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111 | * alpha is the only exception, all other architectures |
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112 | * have common numbers for new system calls. |
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113 | */ |
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114 | #ifndef __NR_io_uring_setup |
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115 | #define __NR_io_uring_setup 535 |
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116 | #endif |
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117 | #ifndef __NR_io_uring_enter |
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118 | #define __NR_io_uring_enter 536 |
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119 | #endif |
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120 | #ifndef __NR_io_uring_register |
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121 | #define __NR_io_uring_register 537 |
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122 | #endif |
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123 | #else /* !__alpha__ */ |
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124 | #ifndef __NR_io_uring_setup |
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125 | #define __NR_io_uring_setup 425 |
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126 | #endif |
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127 | #ifndef __NR_io_uring_enter |
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128 | #define __NR_io_uring_enter 426 |
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129 | #endif |
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130 | #ifndef __NR_io_uring_register |
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131 | #define __NR_io_uring_register 427 |
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132 | #endif |
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133 | #endif |
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134 | |
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135 | struct $io_ctx_thread; |
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136 | void __ioctx_register($io_ctx_thread & ctx); |
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137 | void __ioctx_unregister($io_ctx_thread & ctx); |
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138 | void __ioctx_prepare_block($io_ctx_thread & ctx); |
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139 | void __sqe_clean( volatile struct io_uring_sqe * sqe ); |
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140 | #endif |
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141 | |
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142 | //----------------------------------------------------------------------- |
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143 | // IO user data |
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144 | struct io_future_t { |
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145 | future_t self; |
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146 | __s32 result; |
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147 | }; |
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148 | |
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149 | static inline { |
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150 | bool fulfil( io_future_t & this, __s32 result ) { |
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151 | this.result = result; |
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152 | return fulfil(this.self); |
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153 | } |
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154 | |
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155 | // Wait for the future to be fulfilled |
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156 | bool wait( io_future_t & this ) { |
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157 | return wait(this.self); |
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158 | } |
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159 | } |
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