[3e2b9c9] | 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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[454f478] | 7 | // io/types.hfa -- PRIVATE |
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| 8 | // Types used by the I/O subsystem |
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[3e2b9c9] | 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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[b035046] | 19 | #include <limits.h> |
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| 20 | |
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[930e57e] | 21 | extern "C" { |
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| 22 | #include <linux/types.h> |
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| 23 | } |
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[4998155] | 24 | |
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[9db2c92] | 25 | #include "bits/locks.hfa" |
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[11054eb] | 26 | #include "bits/queue.hfa" |
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[40a606d2] | 27 | #include "iofwd.hfa" |
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[454f478] | 28 | #include "kernel/fwd.hfa" |
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[3e2b9c9] | 29 | |
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[930e57e] | 30 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
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[78da4ab] | 31 | #include "bits/sequence.hfa" |
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| 32 | #include "monitor.hfa" |
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[2fafe7e] | 33 | |
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[78da4ab] | 34 | struct processor; |
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[8bee858] | 35 | monitor io_arbiter$; |
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[2fafe7e] | 36 | |
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[3e2b9c9] | 37 | //----------------------------------------------------------------------- |
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| 38 | // Ring Data structure |
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[78da4ab] | 39 | struct __sub_ring_t { |
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| 40 | struct { |
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| 41 | // Head and tail of the ring (associated with array) |
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| 42 | volatile __u32 * head; // one passed last index consumed by the kernel |
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| 43 | volatile __u32 * tail; // one passed last index visible to the kernel |
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| 44 | volatile __u32 released; // one passed last index released back to the free list |
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| 45 | |
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| 46 | // The actual kernel ring which uses head/tail |
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| 47 | // indexes into the sqes arrays |
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| 48 | __u32 * array; |
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| 49 | } kring; |
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| 50 | |
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| 51 | struct { |
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| 52 | volatile __u32 head; |
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| 53 | volatile __u32 tail; |
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| 54 | // The ring which contains free allocations |
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| 55 | // indexes into the sqes arrays |
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| 56 | __u32 * array; |
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| 57 | } free_ring; |
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| 58 | |
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| 59 | // number of sqes to submit on next system call. |
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| 60 | __u32 to_submit; |
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[3e2b9c9] | 61 | |
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| 62 | // number of entries and mask to go with it |
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[4998155] | 63 | const __u32 * num; |
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| 64 | const __u32 * mask; |
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[3e2b9c9] | 65 | |
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[78da4ab] | 66 | // Submission flags, currently only IORING_SETUP_SQPOLL |
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[4998155] | 67 | __u32 * flags; |
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[3e2b9c9] | 68 | |
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[78da4ab] | 69 | // number of sqes not submitted |
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| 70 | // From documentation : [dropped] is incremented for each invalid submission queue entry encountered in the ring buffer. |
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[4998155] | 71 | __u32 * dropped; |
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[3e2b9c9] | 72 | |
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| 73 | // A buffer of sqes (not the actual ring) |
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[78da4ab] | 74 | struct io_uring_sqe * sqes; |
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[3e2b9c9] | 75 | |
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| 76 | // The location and size of the mmaped area |
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| 77 | void * ring_ptr; |
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| 78 | size_t ring_sz; |
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| 79 | }; |
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| 80 | |
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[78da4ab] | 81 | struct __cmp_ring_t { |
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[4ecc35a] | 82 | volatile bool lock; |
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| 83 | |
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[78a580d] | 84 | unsigned id; |
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| 85 | |
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| 86 | unsigned long long ts; |
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| 87 | |
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[3e2b9c9] | 88 | // Head and tail of the ring |
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[4998155] | 89 | volatile __u32 * head; |
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| 90 | volatile __u32 * tail; |
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[3e2b9c9] | 91 | |
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| 92 | // number of entries and mask to go with it |
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[4998155] | 93 | const __u32 * mask; |
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| 94 | const __u32 * num; |
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[3e2b9c9] | 95 | |
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[78da4ab] | 96 | // I don't know what this value is for |
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[4998155] | 97 | __u32 * overflow; |
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[3e2b9c9] | 98 | |
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| 99 | // the kernel ring |
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[426f60c] | 100 | volatile struct io_uring_cqe * cqes; |
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[3e2b9c9] | 101 | |
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| 102 | // The location and size of the mmaped area |
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| 103 | void * ring_ptr; |
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| 104 | size_t ring_sz; |
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| 105 | }; |
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| 106 | |
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[11054eb] | 107 | struct __outstanding_io { |
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| 108 | inline Colable; |
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| 109 | single_sem sem; |
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| 110 | }; |
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| 111 | static inline __outstanding_io *& Next( __outstanding_io * n ) { return (__outstanding_io *)Next( (Colable *)n ); } |
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| 112 | |
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| 113 | struct __outstanding_io_queue { |
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| 114 | __spinlock_t lock; |
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| 115 | Queue(__outstanding_io) queue; |
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| 116 | volatile bool empty; |
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| 117 | }; |
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| 118 | |
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| 119 | struct __external_io { |
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| 120 | inline __outstanding_io; |
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| 121 | __u32 * idxs; |
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| 122 | __u32 have; |
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| 123 | bool lazy; |
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| 124 | }; |
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| 125 | |
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| 126 | |
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[8bee858] | 127 | struct __attribute__((aligned(64))) io_context$ { |
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| 128 | io_arbiter$ * arbiter; |
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[1756e08] | 129 | struct processor * proc; |
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[78da4ab] | 130 | |
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[11054eb] | 131 | __outstanding_io_queue ext_sq; |
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[78da4ab] | 132 | |
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| 133 | struct __sub_ring_t sq; |
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| 134 | struct __cmp_ring_t cq; |
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[4998155] | 135 | __u32 ring_flags; |
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[3e2b9c9] | 136 | int fd; |
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[78da4ab] | 137 | }; |
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| 138 | |
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[8bee858] | 139 | static inline unsigned long long ts(io_context$ *& this) { |
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[e71e94a] | 140 | const __u32 head = *this->cq.head; |
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| 141 | const __u32 tail = *this->cq.tail; |
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| 142 | |
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[b035046] | 143 | if(head == tail) return ULLONG_MAX; |
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[e71e94a] | 144 | |
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[4479890] | 145 | return this->cq.ts; |
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| 146 | } |
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| 147 | |
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[11054eb] | 148 | struct __pending_alloc { |
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| 149 | inline __outstanding_io; |
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| 150 | __u32 * idxs; |
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| 151 | __u32 want; |
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[8bee858] | 152 | io_context$ * ctx; |
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[11054eb] | 153 | }; |
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| 154 | |
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[8bee858] | 155 | monitor __attribute__((aligned(64))) io_arbiter$ { |
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[11054eb] | 156 | __outstanding_io_queue pending; |
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[3e2b9c9] | 157 | }; |
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| 158 | |
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| 159 | //----------------------------------------------------------------------- |
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| 160 | // Misc |
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| 161 | // Weirdly, some systems that do support io_uring don't actually define these |
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| 162 | #ifdef __alpha__ |
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| 163 | /* |
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| 164 | * alpha is the only exception, all other architectures |
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| 165 | * have common numbers for new system calls. |
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| 166 | */ |
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| 167 | #ifndef __NR_io_uring_setup |
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| 168 | #define __NR_io_uring_setup 535 |
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| 169 | #endif |
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| 170 | #ifndef __NR_io_uring_enter |
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| 171 | #define __NR_io_uring_enter 536 |
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| 172 | #endif |
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| 173 | #ifndef __NR_io_uring_register |
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| 174 | #define __NR_io_uring_register 537 |
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| 175 | #endif |
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| 176 | #else /* !__alpha__ */ |
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| 177 | #ifndef __NR_io_uring_setup |
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| 178 | #define __NR_io_uring_setup 425 |
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| 179 | #endif |
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| 180 | #ifndef __NR_io_uring_enter |
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| 181 | #define __NR_io_uring_enter 426 |
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| 182 | #endif |
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| 183 | #ifndef __NR_io_uring_register |
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| 184 | #define __NR_io_uring_register 427 |
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| 185 | #endif |
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| 186 | #endif |
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| 187 | |
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[8bee858] | 188 | // void __ioctx_prepare_block(io_context$ & ctx); |
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[40a606d2] | 189 | #endif |
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