[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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| 7 | // io/setup.cfa -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Fri Jul 31 16:25:51 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 __cforall_thread__ |
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| 17 | #define _GNU_SOURCE /* See feature_test_macros(7) */ |
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| 18 | |
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[80444bb] | 19 | #if defined(__CFA_DEBUG__) |
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| 20 | // #define __CFA_DEBUG_PRINT_IO__ |
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| 21 | // #define __CFA_DEBUG_PRINT_IO_CORE__ |
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| 22 | #endif |
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| 23 | |
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[3e2b9c9] | 24 | #include "io/types.hfa" |
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[c44d652] | 25 | #include "kernel.hfa" |
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[3e2b9c9] | 26 | |
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| 27 | #if !defined(CFA_HAVE_LINUX_IO_URING_H) |
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| 28 | void __kernel_io_startup() { |
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| 29 | // Nothing to do without io_uring |
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| 30 | } |
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| 31 | |
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| 32 | void __kernel_io_shutdown() { |
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| 33 | // Nothing to do without io_uring |
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| 34 | } |
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| 35 | |
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[f277633e] | 36 | void ?{}(io_context_params & this) {} |
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| 37 | |
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[3e2b9c9] | 38 | void ?{}(io_context & this, struct cluster & cl) {} |
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| 39 | void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {} |
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| 40 | |
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| 41 | void ^?{}(io_context & this) {} |
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| 42 | void ^?{}(io_context & this, bool cluster_context) {} |
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| 43 | |
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[b7664a0] | 44 | void register_fixed_files( io_context &, int *, unsigned ) {} |
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| 45 | void register_fixed_files( cluster &, int *, unsigned ) {} |
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| 46 | |
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[3e2b9c9] | 47 | #else |
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| 48 | #include <errno.h> |
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| 49 | #include <stdint.h> |
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| 50 | #include <string.h> |
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| 51 | #include <signal.h> |
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| 52 | #include <unistd.h> |
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| 53 | |
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| 54 | extern "C" { |
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| 55 | #include <pthread.h> |
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| 56 | #include <sys/epoll.h> |
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[426f60c] | 57 | #include <sys/eventfd.h> |
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[3e2b9c9] | 58 | #include <sys/mman.h> |
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| 59 | #include <sys/syscall.h> |
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| 60 | |
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| 61 | #include <linux/io_uring.h> |
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| 62 | } |
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| 63 | |
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| 64 | #include "bitmanip.hfa" |
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| 65 | #include "kernel_private.hfa" |
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| 66 | #include "thread.hfa" |
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| 67 | |
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| 68 | void ?{}(io_context_params & this) { |
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| 69 | this.num_entries = 256; |
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| 70 | this.num_ready = 256; |
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| 71 | this.submit_aff = -1; |
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| 72 | this.eager_submits = false; |
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| 73 | this.poller_submits = false; |
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| 74 | this.poll_submit = false; |
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| 75 | this.poll_complete = false; |
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| 76 | } |
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| 77 | |
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| 78 | static void * __io_poller_slow( void * arg ); |
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| 79 | |
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| 80 | // Weirdly, some systems that do support io_uring don't actually define these |
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| 81 | #ifdef __alpha__ |
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| 82 | /* |
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| 83 | * alpha is the only exception, all other architectures |
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| 84 | * have common numbers for new system calls. |
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| 85 | */ |
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| 86 | #ifndef __NR_io_uring_setup |
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| 87 | #define __NR_io_uring_setup 535 |
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| 88 | #endif |
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| 89 | #ifndef __NR_io_uring_enter |
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| 90 | #define __NR_io_uring_enter 536 |
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| 91 | #endif |
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| 92 | #ifndef __NR_io_uring_register |
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| 93 | #define __NR_io_uring_register 537 |
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| 94 | #endif |
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| 95 | #else /* !__alpha__ */ |
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| 96 | #ifndef __NR_io_uring_setup |
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| 97 | #define __NR_io_uring_setup 425 |
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| 98 | #endif |
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| 99 | #ifndef __NR_io_uring_enter |
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| 100 | #define __NR_io_uring_enter 426 |
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| 101 | #endif |
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| 102 | #ifndef __NR_io_uring_register |
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| 103 | #define __NR_io_uring_register 427 |
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| 104 | #endif |
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| 105 | #endif |
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| 106 | |
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| 107 | //============================================================================================= |
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| 108 | // I/O Startup / Shutdown logic + Master Poller |
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| 109 | //============================================================================================= |
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| 110 | |
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| 111 | // IO Master poller loop forward |
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| 112 | static void * iopoll_loop( __attribute__((unused)) void * args ); |
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| 113 | |
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| 114 | static struct { |
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| 115 | pthread_t thrd; // pthread handle to io poller thread |
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| 116 | void * stack; // pthread stack for io poller thread |
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| 117 | int epollfd; // file descriptor to the epoll instance |
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| 118 | volatile bool run; // Whether or not to continue |
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| 119 | } iopoll; |
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| 120 | |
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| 121 | void __kernel_io_startup(void) { |
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[80444bb] | 122 | __cfadbg_print_safe(io_core, "Kernel : Creating EPOLL instance\n" ); |
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[3e2b9c9] | 123 | |
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| 124 | iopoll.epollfd = epoll_create1(0); |
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| 125 | if (iopoll.epollfd == -1) { |
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| 126 | abort( "internal error, epoll_create1\n"); |
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| 127 | } |
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| 128 | |
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[80444bb] | 129 | __cfadbg_print_safe(io_core, "Kernel : Starting io poller thread\n" ); |
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[3e2b9c9] | 130 | |
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| 131 | iopoll.run = true; |
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| 132 | iopoll.stack = __create_pthread( &iopoll.thrd, iopoll_loop, 0p ); |
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| 133 | } |
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| 134 | |
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| 135 | void __kernel_io_shutdown(void) { |
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| 136 | // Notify the io poller thread of the shutdown |
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| 137 | iopoll.run = false; |
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| 138 | sigval val = { 1 }; |
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| 139 | pthread_sigqueue( iopoll.thrd, SIGUSR1, val ); |
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| 140 | |
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| 141 | // Wait for the io poller thread to finish |
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| 142 | |
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[bfcf6b9] | 143 | __destroy_pthread( iopoll.thrd, iopoll.stack, 0p ); |
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[3e2b9c9] | 144 | |
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| 145 | int ret = close(iopoll.epollfd); |
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| 146 | if (ret == -1) { |
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| 147 | abort( "internal error, close epoll\n"); |
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| 148 | } |
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| 149 | |
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| 150 | // Io polling is now fully stopped |
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| 151 | |
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[80444bb] | 152 | __cfadbg_print_safe(io_core, "Kernel : IO poller stopped\n" ); |
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[3e2b9c9] | 153 | } |
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| 154 | |
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| 155 | static void * iopoll_loop( __attribute__((unused)) void * args ) { |
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| 156 | __processor_id_t id; |
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[58d64a4] | 157 | id.full_proc = false; |
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[3e2b9c9] | 158 | id.id = doregister(&id); |
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[8fc652e0] | 159 | __cfaabi_tls.this_proc_id = &id; |
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[80444bb] | 160 | __cfadbg_print_safe(io_core, "Kernel : IO poller thread starting\n" ); |
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[3e2b9c9] | 161 | |
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| 162 | // Block signals to control when they arrive |
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| 163 | sigset_t mask; |
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| 164 | sigfillset(&mask); |
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| 165 | if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) { |
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| 166 | abort( "internal error, pthread_sigmask" ); |
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| 167 | } |
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| 168 | |
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| 169 | sigdelset( &mask, SIGUSR1 ); |
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| 170 | |
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| 171 | // Create sufficient events |
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| 172 | struct epoll_event events[10]; |
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| 173 | // Main loop |
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| 174 | while( iopoll.run ) { |
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[ece0e80] | 175 | __cfadbg_print_safe(io_core, "Kernel I/O - epoll : waiting on io_uring contexts\n"); |
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| 176 | |
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[3e2b9c9] | 177 | // Wait for events |
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| 178 | int nfds = epoll_pwait( iopoll.epollfd, events, 10, -1, &mask ); |
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| 179 | |
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[ece0e80] | 180 | __cfadbg_print_safe(io_core, "Kernel I/O - epoll : %d io contexts events, waking up\n", nfds); |
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| 181 | |
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[3e2b9c9] | 182 | // Check if an error occured |
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| 183 | if (nfds == -1) { |
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| 184 | if( errno == EINTR ) continue; |
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| 185 | abort( "internal error, pthread_sigmask" ); |
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| 186 | } |
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| 187 | |
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| 188 | for(i; nfds) { |
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| 189 | $io_ctx_thread * io_ctx = ($io_ctx_thread *)(uintptr_t)events[i].data.u64; |
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| 190 | /* paranoid */ verify( io_ctx ); |
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[426f60c] | 191 | __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Unparking io poller %d (%p)\n", io_ctx->ring->fd, io_ctx); |
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[3e2b9c9] | 192 | #if !defined( __CFA_NO_STATISTICS__ ) |
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[8fc652e0] | 193 | __cfaabi_tls.this_stats = io_ctx->self.curr_cluster->stats; |
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[3e2b9c9] | 194 | #endif |
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[d48b174] | 195 | |
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| 196 | eventfd_t v; |
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| 197 | eventfd_read(io_ctx->ring->efd, &v); |
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| 198 | |
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[e873838] | 199 | post( io_ctx->sem ); |
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[3e2b9c9] | 200 | } |
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| 201 | } |
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| 202 | |
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[80444bb] | 203 | __cfadbg_print_safe(io_core, "Kernel : IO poller thread stopping\n" ); |
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[3e2b9c9] | 204 | unregister(&id); |
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| 205 | return 0p; |
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| 206 | } |
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| 207 | |
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| 208 | //============================================================================================= |
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| 209 | // I/O Context Constrution/Destruction |
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| 210 | //============================================================================================= |
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| 211 | |
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| 212 | void ?{}($io_ctx_thread & this, struct cluster & cl) { (this.self){ "IO Poller", cl }; } |
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| 213 | void main( $io_ctx_thread & this ); |
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| 214 | static inline $thread * get_thread( $io_ctx_thread & this ) { return &this.self; } |
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| 215 | void ^?{}( $io_ctx_thread & mutex this ) {} |
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| 216 | |
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| 217 | static void __io_create ( __io_data & this, const io_context_params & params_in ); |
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| 218 | static void __io_destroy( __io_data & this ); |
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| 219 | |
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| 220 | void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) { |
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| 221 | (this.thrd){ cl }; |
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| 222 | this.thrd.ring = malloc(); |
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| 223 | __cfadbg_print_safe(io_core, "Kernel I/O : Creating ring for io_context %p\n", &this); |
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| 224 | __io_create( *this.thrd.ring, params ); |
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| 225 | |
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| 226 | __cfadbg_print_safe(io_core, "Kernel I/O : Starting poller thread for io_context %p\n", &this); |
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| 227 | this.thrd.done = false; |
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| 228 | __thrd_start( this.thrd, main ); |
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| 229 | |
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| 230 | __cfadbg_print_safe(io_core, "Kernel I/O : io_context %p ready\n", &this); |
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| 231 | } |
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| 232 | |
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| 233 | void ?{}(io_context & this, struct cluster & cl) { |
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| 234 | io_context_params params; |
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| 235 | (this){ cl, params }; |
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| 236 | } |
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| 237 | |
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| 238 | void ^?{}(io_context & this, bool cluster_context) { |
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| 239 | __cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %p\n", &this); |
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| 240 | |
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| 241 | // Notify the thread of the shutdown |
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| 242 | __atomic_store_n(&this.thrd.done, true, __ATOMIC_SEQ_CST); |
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| 243 | |
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| 244 | // If this is an io_context within a cluster, things get trickier |
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| 245 | $thread & thrd = this.thrd.self; |
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| 246 | if( cluster_context ) { |
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[ece0e80] | 247 | // We are about to do weird things with the threads |
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| 248 | // we don't need interrupts to complicate everything |
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| 249 | disable_interrupts(); |
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| 250 | |
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| 251 | // Get cluster info |
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[3e2b9c9] | 252 | cluster & cltr = *thrd.curr_cluster; |
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[1eb239e4] | 253 | /* paranoid */ verify( cltr.idles.total == 0 || &cltr == mainCluster ); |
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[3e2b9c9] | 254 | /* paranoid */ verify( !ready_mutate_islocked() ); |
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| 255 | |
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| 256 | // We need to adjust the clean-up based on where the thread is |
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| 257 | if( thrd.state == Ready || thrd.preempted != __NO_PREEMPTION ) { |
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[ece0e80] | 258 | // This is the tricky case |
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| 259 | // The thread was preempted or ready to run and now it is on the ready queue |
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| 260 | // but the cluster is shutting down, so there aren't any processors to run the ready queue |
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| 261 | // the solution is to steal the thread from the ready-queue and pretend it was blocked all along |
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[3e2b9c9] | 262 | |
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[e873838] | 263 | ready_schedule_lock(); |
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[ece0e80] | 264 | // The thread should on the list |
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[3e2b9c9] | 265 | /* paranoid */ verify( thrd.link.next != 0p ); |
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| 266 | |
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| 267 | // Remove the thread from the ready queue of this cluster |
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[ece0e80] | 268 | // The thread should be the last on the list |
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[3e2b9c9] | 269 | __attribute__((unused)) bool removed = remove_head( &cltr, &thrd ); |
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| 270 | /* paranoid */ verify( removed ); |
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| 271 | thrd.link.next = 0p; |
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| 272 | thrd.link.prev = 0p; |
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| 273 | |
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| 274 | // Fixup the thread state |
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| 275 | thrd.state = Blocked; |
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[6a77224] | 276 | thrd.ticket = TICKET_BLOCKED; |
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[3e2b9c9] | 277 | thrd.preempted = __NO_PREEMPTION; |
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| 278 | |
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[e873838] | 279 | ready_schedule_unlock(); |
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[3e2b9c9] | 280 | |
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| 281 | // Pretend like the thread was blocked all along |
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| 282 | } |
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| 283 | // !!! This is not an else if !!! |
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[ece0e80] | 284 | // Ok, now the thread is blocked (whether we cheated to get here or not) |
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[3e2b9c9] | 285 | if( thrd.state == Blocked ) { |
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| 286 | // This is the "easy case" |
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| 287 | // The thread is parked and can easily be moved to active cluster |
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| 288 | verify( thrd.curr_cluster != active_cluster() || thrd.curr_cluster == mainCluster ); |
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| 289 | thrd.curr_cluster = active_cluster(); |
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| 290 | |
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| 291 | // unpark the fast io_poller |
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[0d72d45] | 292 | unpark( &thrd ); |
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[3e2b9c9] | 293 | } |
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| 294 | else { |
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| 295 | // The thread is in a weird state |
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| 296 | // I don't know what to do here |
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| 297 | abort("io_context poller thread is in unexpected state, cannot clean-up correctly\n"); |
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| 298 | } |
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[ece0e80] | 299 | |
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| 300 | // The weird thread kidnapping stuff is over, restore interrupts. |
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| 301 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[3e2b9c9] | 302 | } else { |
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[3c80ccc] | 303 | post( this.thrd.sem ); |
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[3e2b9c9] | 304 | } |
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| 305 | |
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| 306 | ^(this.thrd){}; |
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| 307 | __cfadbg_print_safe(io_core, "Kernel I/O : Stopped poller thread for io_context %p\n", &this); |
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| 308 | |
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| 309 | __io_destroy( *this.thrd.ring ); |
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| 310 | __cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %p\n", &this); |
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| 311 | |
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| 312 | free(this.thrd.ring); |
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| 313 | } |
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| 314 | |
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| 315 | void ^?{}(io_context & this) { |
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| 316 | ^(this){ false }; |
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| 317 | } |
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| 318 | |
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[7222630] | 319 | extern void __disable_interrupts_hard(); |
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| 320 | extern void __enable_interrupts_hard(); |
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[bb58825] | 321 | |
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[3e2b9c9] | 322 | static void __io_create( __io_data & this, const io_context_params & params_in ) { |
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| 323 | // Step 1 : call to setup |
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| 324 | struct io_uring_params params; |
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| 325 | memset(¶ms, 0, sizeof(params)); |
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| 326 | if( params_in.poll_submit ) params.flags |= IORING_SETUP_SQPOLL; |
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| 327 | if( params_in.poll_complete ) params.flags |= IORING_SETUP_IOPOLL; |
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| 328 | |
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[4998155] | 329 | __u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256; |
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[63fe427c] | 330 | if( !is_pow2(nentries) ) { |
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| 331 | abort("ERROR: I/O setup 'num_entries' must be a power of 2\n"); |
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| 332 | } |
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| 333 | if( params_in.poller_submits && params_in.eager_submits ) { |
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| 334 | abort("ERROR: I/O setup 'poller_submits' and 'eager_submits' cannot be used together\n"); |
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| 335 | } |
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[3e2b9c9] | 336 | |
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| 337 | int fd = syscall(__NR_io_uring_setup, nentries, ¶ms ); |
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| 338 | if(fd < 0) { |
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| 339 | abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno)); |
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| 340 | } |
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| 341 | |
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| 342 | // Step 2 : mmap result |
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| 343 | memset( &this, 0, sizeof(struct __io_data) ); |
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| 344 | struct __submition_data & sq = this.submit_q; |
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| 345 | struct __completion_data & cq = this.completion_q; |
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| 346 | |
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| 347 | // calculate the right ring size |
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| 348 | sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) ); |
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| 349 | cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe)); |
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| 350 | |
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| 351 | // Requires features |
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| 352 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 353 | // adjust the size according to the parameters |
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| 354 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 355 | cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz); |
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| 356 | } |
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| 357 | #endif |
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| 358 | |
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| 359 | // mmap the Submit Queue into existence |
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| 360 | 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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| 361 | if (sq.ring_ptr == (void*)MAP_FAILED) { |
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| 362 | abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno)); |
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| 363 | } |
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| 364 | |
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| 365 | // Requires features |
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| 366 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 367 | // mmap the Completion Queue into existence (may or may not be needed) |
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| 368 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 369 | cq.ring_ptr = sq.ring_ptr; |
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| 370 | } |
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| 371 | else |
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| 372 | #endif |
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| 373 | { |
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| 374 | // We need multiple call to MMAP |
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| 375 | 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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| 376 | if (cq.ring_ptr == (void*)MAP_FAILED) { |
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| 377 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 378 | abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno)); |
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| 379 | } |
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| 380 | } |
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| 381 | |
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| 382 | // mmap the submit queue entries |
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| 383 | size_t size = params.sq_entries * sizeof(struct io_uring_sqe); |
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| 384 | 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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| 385 | if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) { |
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| 386 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 387 | if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz); |
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| 388 | abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno)); |
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| 389 | } |
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| 390 | |
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[426f60c] | 391 | // Step 3 : Initialize the data structure |
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[3e2b9c9] | 392 | // Get the pointers from the kernel to fill the structure |
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| 393 | // submit queue |
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[4998155] | 394 | sq.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); |
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| 395 | sq.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); |
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| 396 | sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); |
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| 397 | sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); |
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| 398 | sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); |
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| 399 | sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); |
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| 400 | sq.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); |
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[3e2b9c9] | 401 | sq.prev_head = *sq.head; |
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| 402 | |
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| 403 | { |
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[4998155] | 404 | const __u32 num = *sq.num; |
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[3e2b9c9] | 405 | for( i; num ) { |
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[ec19b21] | 406 | __sqe_clean( &sq.sqes[i] ); |
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[3e2b9c9] | 407 | } |
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| 408 | } |
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| 409 | |
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[2fafe7e] | 410 | (sq.submit_lock){}; |
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[3e2b9c9] | 411 | (sq.release_lock){}; |
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| 412 | |
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| 413 | if( params_in.poller_submits || params_in.eager_submits ) { |
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| 414 | /* paranoid */ verify( is_pow2( params_in.num_ready ) || (params_in.num_ready < 8) ); |
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| 415 | sq.ready_cnt = max( params_in.num_ready, 8 ); |
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[ceb7db8] | 416 | sq.ready = alloc( sq.ready_cnt, 64`align ); |
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[3e2b9c9] | 417 | for(i; sq.ready_cnt) { |
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| 418 | sq.ready[i] = -1ul32; |
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| 419 | } |
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[1095ccd] | 420 | sq.prev_ready = 0; |
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[3e2b9c9] | 421 | } |
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| 422 | else { |
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| 423 | sq.ready_cnt = 0; |
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| 424 | sq.ready = 0p; |
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[1095ccd] | 425 | sq.prev_ready = 0; |
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[3e2b9c9] | 426 | } |
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| 427 | |
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| 428 | // completion queue |
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[4998155] | 429 | cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head); |
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| 430 | cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail); |
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| 431 | cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask); |
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| 432 | cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries); |
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| 433 | cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow); |
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| 434 | cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes); |
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[3e2b9c9] | 435 | |
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[426f60c] | 436 | // Step 4 : eventfd |
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[bb58825] | 437 | // io_uring_register is so f*cking slow on some machine that it |
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| 438 | // will never succeed if preemption isn't hard blocked |
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[7222630] | 439 | __disable_interrupts_hard(); |
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[bb58825] | 440 | |
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| 441 | int efd = eventfd(0, 0); |
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| 442 | if (efd < 0) { |
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| 443 | abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno)); |
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[426f60c] | 444 | } |
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| 445 | |
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[bb58825] | 446 | int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1); |
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| 447 | if (ret < 0) { |
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| 448 | abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno)); |
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[426f60c] | 449 | } |
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| 450 | |
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[7222630] | 451 | __enable_interrupts_hard(); |
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[bb58825] | 452 | |
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[3e2b9c9] | 453 | // some paranoid checks |
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| 454 | /* 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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| 455 | /* paranoid */ verifyf( (*cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num ); |
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| 456 | /* paranoid */ verifyf( (*cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head ); |
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| 457 | /* paranoid */ verifyf( (*cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail ); |
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| 458 | |
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| 459 | /* 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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| 460 | /* paranoid */ verifyf( (*sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num ); |
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| 461 | /* paranoid */ verifyf( (*sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head ); |
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| 462 | /* paranoid */ verifyf( (*sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail ); |
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| 463 | |
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| 464 | // Update the global ring info |
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| 465 | this.ring_flags = params.flags; |
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| 466 | this.fd = fd; |
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[426f60c] | 467 | this.efd = efd; |
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[3e2b9c9] | 468 | this.eager_submits = params_in.eager_submits; |
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| 469 | this.poller_submits = params_in.poller_submits; |
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| 470 | } |
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| 471 | |
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| 472 | static void __io_destroy( __io_data & this ) { |
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| 473 | // Shutdown the io rings |
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| 474 | struct __submition_data & sq = this.submit_q; |
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| 475 | struct __completion_data & cq = this.completion_q; |
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| 476 | |
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| 477 | // unmap the submit queue entries |
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| 478 | munmap(sq.sqes, (*sq.num) * sizeof(struct io_uring_sqe)); |
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| 479 | |
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| 480 | // unmap the Submit Queue ring |
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| 481 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 482 | |
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| 483 | // unmap the Completion Queue ring, if it is different |
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| 484 | if (cq.ring_ptr != sq.ring_ptr) { |
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| 485 | munmap(cq.ring_ptr, cq.ring_sz); |
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| 486 | } |
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| 487 | |
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| 488 | // close the file descriptor |
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| 489 | close(this.fd); |
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[426f60c] | 490 | close(this.efd); |
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[3e2b9c9] | 491 | |
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| 492 | free( this.submit_q.ready ); // Maybe null, doesn't matter |
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| 493 | } |
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| 494 | |
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| 495 | //============================================================================================= |
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| 496 | // I/O Context Sleep |
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| 497 | //============================================================================================= |
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[d48b174] | 498 | #define IOEVENTS EPOLLIN | EPOLLONESHOT |
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[3e2b9c9] | 499 | |
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[d48b174] | 500 | static inline void __ioctx_epoll_ctl($io_ctx_thread & ctx, int op, const char * error) { |
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| 501 | struct epoll_event ev; |
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| 502 | ev.events = IOEVENTS; |
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[4998155] | 503 | ev.data.u64 = (__u64)&ctx; |
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[d48b174] | 504 | int ret = epoll_ctl(iopoll.epollfd, op, ctx.ring->efd, &ev); |
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[3e2b9c9] | 505 | if (ret < 0) { |
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[d48b174] | 506 | abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) ); |
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[3e2b9c9] | 507 | } |
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| 508 | } |
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| 509 | |
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[d48b174] | 510 | void __ioctx_register($io_ctx_thread & ctx) { |
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| 511 | __ioctx_epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD"); |
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| 512 | } |
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| 513 | |
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| 514 | void __ioctx_prepare_block($io_ctx_thread & ctx) { |
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[426f60c] | 515 | __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.ring->fd, &ctx); |
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[d48b174] | 516 | __ioctx_epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM"); |
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[3e2b9c9] | 517 | } |
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| 518 | |
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| 519 | //============================================================================================= |
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| 520 | // I/O Context Misc Setup |
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| 521 | //============================================================================================= |
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| 522 | void register_fixed_files( io_context & ctx, int * files, unsigned count ) { |
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| 523 | int ret = syscall( __NR_io_uring_register, ctx.thrd.ring->fd, IORING_REGISTER_FILES, files, count ); |
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| 524 | if( ret < 0 ) { |
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| 525 | abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) ); |
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| 526 | } |
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| 527 | |
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| 528 | __cfadbg_print_safe( io_core, "Kernel I/O : Performed io_register for %p, returned %d\n", active_thread(), ret ); |
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| 529 | } |
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| 530 | |
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| 531 | void register_fixed_files( cluster & cltr, int * files, unsigned count ) { |
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| 532 | for(i; cltr.io.cnt) { |
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| 533 | register_fixed_files( cltr.io.ctxs[i], files, count ); |
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| 534 | } |
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| 535 | } |
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[c44d652] | 536 | #endif |
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