[657] | 1 | /* |
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| 2 | * remote_buf.h - Remotely accessible, circular buffer definition. |
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| 3 | * |
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| 4 | * Authors : |
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| 5 | * Alain Greiner (2016,2017,2018,2019,2020) |
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| 6 | * |
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| 7 | * Copyright (c) UPMC Sorbonne Universites |
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| 8 | * |
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| 9 | * This file is part of ALMOS-MKH. |
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| 10 | * |
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| 11 | * ALMOS-MHH is free software; you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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| 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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| 25 | #ifndef _REMOTE_BUFFER_H_ |
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| 26 | #define _REMOTE_BUFFER_H_ |
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| 27 | |
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| 28 | #include <kernel_config.h> |
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| 29 | #include <hal_kernel_types.h> |
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| 30 | |
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| 31 | /************************************************************************************ |
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| 32 | * This structure and the associated access functions define a remotely accessible, |
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| 33 | * kernel buffer, handled as a single-reader & single-writer FIFO. |
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[671] | 34 | * This kernel buffer is implementes as an array of bytes. The size must be a power |
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| 35 | * of 2, dynamically defined by an argument of the "remote_buf_init()" function. |
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[666] | 36 | * The "put()" and "get()" functions defined below move the content of another |
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| 37 | * buffer (can be in kernel or in user space) to/from this circular kernel buffer. |
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[657] | 38 | * This structure is NOT protected by a lock, as the only shared variable is the |
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[666] | 39 | * "sts" variable, that is updated by the hal_remote_atomic_add() primitive. |
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[671] | 40 | * |
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| 41 | * - It is used to implement the three socket buffers (rx_buf / r2tq / crqq). |
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| 42 | * - It is also used to implement the inter-process communications channels |
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| 43 | * based on named "fifos", or unamed "pipes". |
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[657] | 44 | ***********************************************************************************/ |
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| 45 | |
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| 46 | typedef struct remote_buf_s |
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| 47 | { |
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[671] | 48 | uint32_t order; /*! ln2( size of data buffer in bytes) */ |
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| 49 | uint32_t rid; /*! first empty slot index */ |
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| 50 | uint32_t wid; /*! first non-empty slot index */ |
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[657] | 51 | uint32_t sts; /*! current number of non empty slots */ |
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| 52 | uint8_t * data; /*! local pointer on local data buffer */ |
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| 53 | } |
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| 54 | remote_buf_t; |
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| 55 | |
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| 56 | /************************************************************************************ |
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[671] | 57 | * This function allocates memory for a remote_buf descriptor in cluster |
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| 58 | * defined by the <cxy> argument, and return a local pointer on this descriptor. |
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| 59 | ************************************************************************************ |
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| 60 | * @ cxy : target cluster identifier. |
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| 61 | * @ return local pointer on remote_buf descriptor. |
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| 62 | ***********************************************************************************/ |
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| 63 | remote_buf_t * remote_buf_alloc( cxy_t cxy ); |
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| 64 | |
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| 65 | /************************************************************************************ |
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[657] | 66 | * This function initializes a remote_buf descriptor identified by the <buf_xp> |
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[671] | 67 | * argument. It allocates memory for the data, as defined by the <order> argument, |
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[657] | 68 | * and initializes the buffer as empty. It must be called by a local thread. |
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[671] | 69 | * The <order> value cannot be larger than 31. |
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[657] | 70 | ************************************************************************************ |
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| 71 | * @ buf_xp : [in] extended pointer on buffer descriptor. |
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[671] | 72 | * @ order : [in] ln2( number of bytes in buffer) / must be in [0,31]. |
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| 73 | * @ return 0 if success / return -1 if memory failure or illegal order. |
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[657] | 74 | ***********************************************************************************/ |
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[666] | 75 | error_t remote_buf_init( xptr_t buf_xp, |
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[671] | 76 | uint32_t order ); |
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[657] | 77 | |
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| 78 | /************************************************************************************ |
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[671] | 79 | * This function releases memory allocated for the data buffer of an embedded |
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| 80 | * remote-buf descriptor identified by the <buf_xp> argument, when the "data" |
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| 81 | * pointer is not NULL. It does nothing if the data buffer was not allocated. |
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| 82 | * WARNING : do NOT use this function for a dynamically allocated remote_buf. |
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[657] | 83 | ************************************************************************************ |
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| 84 | * @ buf_xp : [in] extended pointer on buffer descriptor. |
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| 85 | ***********************************************************************************/ |
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[671] | 86 | void remote_buf_release_data( xptr_t buf_xp ); |
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| 87 | |
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| 88 | /************************************************************************************ |
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| 89 | * This function releases both the memory allocated for the data buffer, and the |
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| 90 | * memory allocated for the remote_buf descriptor, for a remote-buf identified |
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| 91 | * by the <buf_xp> argument. |
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| 92 | * WARNING : do NOT use this function an embedded remote_buf. |
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| 93 | ************************************************************************************ |
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| 94 | * @ buf_xp : [in] extended pointer on buffer descriptor. |
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| 95 | ***********************************************************************************/ |
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[657] | 96 | void remote_buf_destroy( xptr_t buf_xp ); |
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| 97 | |
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| 98 | /************************************************************************************ |
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| 99 | * This function initialises as empty a buffer identified by the <buf_xp> argument. |
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| 100 | * It can be called by a thread runing in any cluster. |
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| 101 | ************************************************************************************ |
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| 102 | * @ buf_xp : [in] extended pointer on remote buffer descriptor. |
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| 103 | ***********************************************************************************/ |
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| 104 | void remote_buf_reset( xptr_t buf_xp ); |
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| 105 | |
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| 106 | /************************************************************************************ |
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| 107 | * This function moves <nbytes> from a remote_buf_t identified by the <buf_xp> |
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| 108 | * argument to an user buffer identified by the <u_buf> argument. |
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| 109 | * It uses the hal_copy_to_uspace() function, and updates "sts" and "ptr". |
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| 110 | * The calling function is supposed to previously check the buffer status. |
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| 111 | * It can be called by a thread runing in any cluster. |
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| 112 | ************************************************************************************ |
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| 113 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 114 | * @ u_buf : [in] pointer on destination user buffer in user space. |
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| 115 | * @ nbytes : [in] number of bytes to move. |
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| 116 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 117 | ***********************************************************************************/ |
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| 118 | error_t remote_buf_get_to_user( xptr_t buf_xp, |
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| 119 | uint8_t * u_buf, |
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| 120 | uint32_t nbytes ); |
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| 121 | |
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| 122 | /************************************************************************************ |
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| 123 | * This function moves <nbytes> from a remote_buf_t identified by the <buf_xp> |
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| 124 | * argument to a local kernel buffer identified by the <k_buf> argument. |
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| 125 | * It uses an hal_remote_memcpy() function, and updates the "sts" and "ptr" fields. |
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| 126 | * The calling function is supposed to previously check the buffer status. |
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| 127 | * It can be called by a thread runing in any cluster. |
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| 128 | ************************************************************************************ |
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| 129 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 130 | * @ k_buf : [in] local pointer on local destination kernel buffer. |
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| 131 | * @ nbytes : [in] number of bytes to move. |
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| 132 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 133 | ***********************************************************************************/ |
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| 134 | error_t remote_buf_get_to_kernel( xptr_t buf_xp, |
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| 135 | uint8_t * k_buf, |
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| 136 | uint32_t nbytes ); |
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| 137 | |
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| 138 | /************************************************************************************ |
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| 139 | * This function moves <nbytes> from an user buffer identified by the <u_buf> |
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| 140 | * argument to a remote_buf_t identified by the <buf_xp> argument. |
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| 141 | * It uses the hal_copy_from_uspace() function, and updates "sts" and "ptw".. |
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| 142 | * The calling function is supposed to previously check the buffer status. |
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| 143 | * It can be called by a thread runing in any cluster. |
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| 144 | ************************************************************************************ |
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| 145 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 146 | * @ u_buf : [in] pointer on source user buffer in user space. |
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| 147 | * @ nbytes : [in] number of bytes to move. |
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| 148 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 149 | ***********************************************************************************/ |
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| 150 | error_t remote_buf_put_from_user( xptr_t buf_xp, |
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| 151 | uint8_t * u_buf, |
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| 152 | uint32_t nbytes ); |
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| 153 | |
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| 154 | /************************************************************************************ |
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| 155 | * This function moves <nbytes> from a local kernel buffer identified by the <k_buf> |
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| 156 | * argument to a remote_buf_t identified by the <buf_xp> argument. |
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| 157 | * It uses an hal_remote_memcpy() function, and updates the "sts" and "ptw" fields. |
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| 158 | * The calling function is supposed to previously check the buffer status. |
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| 159 | * It can be called by a thread runing in any cluster. |
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| 160 | ************************************************************************************ |
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| 161 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 162 | * @ k_buf : [in] local pointer on local source kernel buffer. |
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| 163 | * @ nbytes : [in] number of bytes to move. |
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| 164 | * @ return 0 if success / return -1 if not enough bytes in buffer. |
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| 165 | ***********************************************************************************/ |
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| 166 | error_t remote_buf_put_from_kernel( xptr_t buf_xp, |
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| 167 | uint8_t * k_buf, |
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| 168 | uint32_t nbytes ); |
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| 169 | |
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| 170 | /************************************************************************************ |
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| 171 | * This function returns the current number of bytes stored in buffer. |
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| 172 | ************************************************************************************ |
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| 173 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 174 | * @ return current number of bytes in buffer. |
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| 175 | ***********************************************************************************/ |
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| 176 | uint32_t remote_buf_status( xptr_t buf_xp ); |
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| 177 | |
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[683] | 178 | /************************************************************************************ |
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| 179 | * This debug function displays on the kernel terminal the current state of a remote |
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| 180 | * buffer identified by the <buf_xp> argument : order / rid / wid / sts. |
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| 181 | * If the <nbytes> argument is not nul, and not larger than 256, it displays up to |
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| 182 | * 256 bytes of the data buffer, from <offset> to (offset + nbytes -1). |
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| 183 | ************************************************************************************ |
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| 184 | * @ func_str : [in] calling function name (displayed in header). |
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| 185 | * @ buf_xp : [in] extended pointer pointer on remote buffer descriptor. |
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| 186 | * @ nbytes : [in] number of data bytes to display. |
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| 187 | * @ offset : [in] index of first displayed byte in data buffer. |
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| 188 | ***********************************************************************************/ |
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| 189 | void remote_buf_display( const char * func_str, |
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| 190 | xptr_t buf_xp, |
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| 191 | uint32_t nbytes, |
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| 192 | uint32_t offset ); |
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| 193 | |
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[657] | 194 | #endif /* _REMOTE_BUFFER_H_ */ |
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