1 | ////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : hba_driver.c |
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3 | // Date : 23/11/2013 |
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4 | // Author : alain greiner |
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5 | // Copyright (c) UPMC-LIP6 |
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6 | /////////////////////////////////////////////////////////////////////////////////// |
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7 | // Implementation notes: |
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8 | // All accesses to HBA registers are done by the two |
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9 | // _hba_set_register() and _hba_get_register() low-level functions, |
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10 | // that are handling virtual / physical extended addressing. |
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11 | /////////////////////////////////////////////////////////////////////////////////// |
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12 | |
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13 | #include <giet_config.h> |
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14 | #include <hard_config.h> |
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15 | #include <hba_driver.h> |
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16 | #include <xcu_driver.h> |
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17 | #include <mmc_driver.h> |
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18 | #include <kernel_locks.h> |
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19 | #include <utils.h> |
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20 | #include <tty0.h> |
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21 | #include <ctx_handler.h> |
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22 | #include <irq_handler.h> |
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23 | #include <vmem.h> |
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24 | |
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25 | ////////////////////////////////////////////////////////////////////////////////// |
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26 | // Extern variables |
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27 | ////////////////////////////////////////////////////////////////////////////////// |
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28 | |
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29 | // allocated in the boot.c or kernel_init.c files |
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30 | extern static_scheduler_t* _schedulers[X_SIZE][Y_SIZE][NB_PROCS_MAX]; |
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31 | extern unsigned int _hba_boot_mode; |
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32 | |
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33 | ////////////////////////////////////////////////////////////////////////////////// |
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34 | // Global variables |
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35 | ////////////////////////////////////////////////////////////////////////////////// |
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36 | // The global variable hba_boot_mode defines the way the HBA component is used |
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37 | // and must be defined in both kernel_init.c and boot.c files. |
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38 | // - during the boot phase, only one processor access the HBA in synchronous |
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39 | // mode. There is no need to use a lock. |
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40 | // - during the execution phase, the HBA device can be used by several processors. |
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41 | // The slot allocator is protected by a sqt_lock. |
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42 | ////////////////////////////////////////////////////////////////////////////////// |
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43 | |
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44 | __attribute__((section(".kdata"))) |
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45 | sqt_lock_t _hba_lock __attribute__((aligned(64))); |
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46 | |
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47 | // state of each slot (allocated to a thread or not) |
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48 | // access must be protected by the allocator_lock in descheduling mode |
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49 | __attribute__((section(".kdata"))) |
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50 | unsigned int _hba_allocated_cmd[32]; |
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51 | |
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52 | // state of the command (active or not), for each possible slot |
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53 | // used only in descheduling mode |
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54 | __attribute__((section(".kdata"))) |
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55 | unsigned int _hba_active_cmd[32]; |
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56 | |
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57 | // global index of the thread, for each entry in the command list |
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58 | __attribute__((section(".kdata"))) |
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59 | unsigned int _hba_trid[32]; |
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60 | |
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61 | // status of HBA commands |
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62 | __attribute__((section(".kdata"))) |
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63 | unsigned int _hba_status; |
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64 | |
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65 | // command list : up to 32 commands |
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66 | __attribute__((section(".kdata"))) |
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67 | hba_cmd_desc_t _hba_cmd_list[32] __attribute__((aligned(0x40))); |
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68 | |
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69 | // command tables array : one command table per entry in command list |
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70 | __attribute__((section(".kdata"))) |
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71 | hba_cmd_table_t _hba_cmd_table[32] __attribute__((aligned(0x40))); |
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72 | |
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73 | |
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74 | ////////////////////////////////////////////////////////////////////////////// |
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75 | // This low level function returns the value of register (index) |
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76 | ////////////////////////////////////////////////////////////////////////////// |
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77 | unsigned int _hba_get_register( unsigned int index ) |
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78 | { |
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79 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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80 | return _io_extended_read( vaddr ); |
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81 | } |
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82 | |
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83 | ////////////////////////////////////////////////////////////////////////////// |
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84 | // This low level function set a new value in register (index) |
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85 | ////////////////////////////////////////////////////////////////////////////// |
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86 | void _hba_set_register( unsigned int index, |
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87 | unsigned int value ) |
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88 | { |
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89 | unsigned int* vaddr = (unsigned int*)SEG_IOC_BASE + index; |
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90 | _io_extended_write( vaddr, value ); |
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91 | } |
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92 | |
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93 | /////////////////////////////////////////////////////////////////////////////// |
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94 | // Extern functions |
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95 | /////////////////////////////////////////////////////////////////////////////// |
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96 | |
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97 | /////////////////////////////////////////////////////////////////////////////// |
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98 | // This blocking fonction allocates a free command index to the thread. |
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99 | // The hba_lock is not used in boot mode. |
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100 | // It returns the allocated command index (between 0 and 31) |
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101 | /////////////////////////////////////////////////////////////////////////////// |
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102 | unsigned int _hba_cmd_alloc() |
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103 | { |
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104 | unsigned int found = 0; |
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105 | unsigned int c; // command index for the loop |
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106 | unsigned int cmd_id = -1; // allocated command index when found |
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107 | |
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108 | while ( found == 0) |
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109 | { |
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110 | if ( !_hba_boot_mode ) _sqt_lock_acquire(&_hba_lock); |
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111 | |
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112 | for ( c = 0; c < 32 ; c++ ) |
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113 | { |
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114 | if (_hba_allocated_cmd[c] == 0) |
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115 | { |
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116 | found = 1; |
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117 | cmd_id = c; |
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118 | _hba_allocated_cmd[c] = 1; |
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119 | break; |
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120 | } |
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121 | } |
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122 | |
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123 | if ( !_hba_boot_mode ) _sqt_lock_release(&_hba_lock); |
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124 | } |
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125 | |
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126 | return cmd_id; |
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127 | } |
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128 | |
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129 | /////////////////////////////////////////////////////////////////////////////// |
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130 | // This function releases the command index in the hba_allocated_cmd table. |
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131 | // There is no need to take the lock because only the thread which owns the |
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132 | // command can release it. |
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133 | // return 0 if success, -1 if error |
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134 | /////////////////////////////////////////////////////////////////////////////// |
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135 | unsigned int _hba_cmd_release(unsigned int cmd_id) |
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136 | { |
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137 | if ( _hba_allocated_cmd[cmd_id] == 0 ) |
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138 | { |
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139 | _printf("\n[HBA ERROR] in _hba_access() : ask to release a command which is not allocated\n"); |
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140 | return -1; |
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141 | } |
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142 | |
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143 | _hba_allocated_cmd[cmd_id] = 0; |
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144 | return 0; |
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145 | } |
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146 | |
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147 | |
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148 | /////////////////////////////////////////////////////////////////////////////// |
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149 | // This function gets a command index with the hba_cmd_alloc function. Then it |
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150 | // registers a command in both the command list and the command table. It |
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151 | // updates the HBA_PXCI register and the hba_active_cmd in descheduling mode. |
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152 | // At the end the command slot is released. |
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153 | // return 0 if success, -1 if error |
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154 | /////////////////////////////////////////////////////////////////////////////// |
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155 | unsigned int _hba_access( unsigned int use_irq, |
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156 | unsigned int to_mem, |
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157 | unsigned int lba, |
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158 | unsigned long long buf_paddr, |
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159 | unsigned int count ) |
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160 | { |
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161 | unsigned int procid = _get_procid(); |
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162 | unsigned int x = procid >> (Y_WIDTH + P_WIDTH); |
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163 | unsigned int y = (procid >> P_WIDTH) & ((1<<Y_WIDTH) - 1); |
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164 | unsigned int p = procid & ((1<<P_WIDTH)-1); |
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165 | |
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166 | #if GIET_DEBUG_IOC |
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167 | if (_get_proctime() > GIET_DEBUG_IOC) |
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168 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] enters at cycle %d\n" |
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169 | " use_irq = %d / to_mem = %d / lba = %x / paddr = %l / count = %d\n", |
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170 | x , y , p , _get_proctime() , use_irq , to_mem , lba , buf_paddr, count ); |
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171 | #endif |
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172 | |
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173 | unsigned int cmd_id; // command index |
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174 | unsigned int pxci; // HBA_PXCI register value |
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175 | unsigned int pxis; // HBA_PXIS register value |
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176 | hba_cmd_desc_t* cmd_desc; // command descriptor pointer |
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177 | hba_cmd_table_t* cmd_table; // command table pointer |
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178 | |
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179 | // check buffer alignment |
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180 | if( buf_paddr & 0x3F ) |
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181 | { |
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182 | _printf("\n[HBA ERROR] in _hba_access() : buffer not 64 bytes aligned\n"); |
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183 | return -1; |
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184 | } |
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185 | |
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186 | // get one entry in Command List |
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187 | cmd_id = _hba_cmd_alloc(); |
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188 | |
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189 | // compute pointers on command descriptor and command table |
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190 | cmd_desc = &_hba_cmd_list[cmd_id]; |
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191 | cmd_table = &_hba_cmd_table[cmd_id]; |
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192 | |
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193 | // set buffer descriptor in command table |
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194 | cmd_table->buffer.dba = (unsigned int)(buf_paddr); |
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195 | cmd_table->buffer.dbau = (unsigned int)(buf_paddr >> 32); |
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196 | cmd_table->buffer.dbc = count * 512; |
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197 | |
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198 | // initialize command table header |
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199 | cmd_table->header.lba0 = (char)lba; |
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200 | cmd_table->header.lba1 = (char)(lba>>8); |
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201 | cmd_table->header.lba2 = (char)(lba>>16); |
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202 | cmd_table->header.lba3 = (char)(lba>>24); |
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203 | cmd_table->header.lba4 = 0; |
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204 | cmd_table->header.lba5 = 0; |
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205 | |
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206 | // initialise command descriptor |
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207 | cmd_desc->prdtl[0] = 1; |
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208 | cmd_desc->prdtl[1] = 0; |
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209 | if( to_mem ) cmd_desc->flag[0] = 0x00; |
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210 | else cmd_desc->flag[0] = 0x40; |
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211 | |
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212 | #if USE_IOB // software L2/L3 cache coherence |
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213 | |
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214 | // compute physical addresses |
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215 | unsigned long long cmd_desc_paddr; // command descriptor physical address |
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216 | unsigned long long cmd_table_paddr; // command table header physical address |
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217 | unsigned int flags; // unused |
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218 | |
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219 | if ( _get_mmu_mode() & 0x4 ) |
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220 | { |
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221 | cmd_desc_paddr = _v2p_translate( (unsigned int)cmd_desc , &flags ); |
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222 | cmd_table_paddr = _v2p_translate( (unsigned int)cmd_table , &flags ); |
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223 | } |
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224 | else |
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225 | { |
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226 | cmd_desc_paddr = (unsigned int)cmd_desc; |
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227 | cmd_table_paddr = (unsigned int)cmd_table; |
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228 | } |
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229 | |
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230 | // update external memory for command table |
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231 | _mmc_sync( cmd_table_paddr & (~0x3F) , sizeof(hba_cmd_table_t) ); |
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232 | |
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233 | // update external memory for command descriptor |
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234 | _mmc_sync( cmd_desc_paddr & (~0x3F) , sizeof(hba_cmd_desc_t) ); |
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235 | |
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236 | // inval or synchronize memory buffer |
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237 | if ( to_mem ) _mmc_inval( buf_paddr, count<<9 ); |
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238 | else _mmc_sync( buf_paddr, count<<9 ); |
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239 | |
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240 | #endif // end software L2/L3 cache coherence |
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241 | |
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242 | ///////////////////////////////////////////////////////////////////// |
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243 | // In synchronous mode, we poll the PXCI register until completion |
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244 | ///////////////////////////////////////////////////////////////////// |
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245 | if ( use_irq == 0 ) |
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246 | { |
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247 | // start HBA transfer |
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248 | _hba_set_register( HBA_PXCI, (1<<cmd_id) ); |
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249 | |
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250 | #if GIET_DEBUG_IOC |
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251 | if (_get_proctime() > GIET_DEBUG_IOC) |
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252 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] get slot %d in Cmd List " |
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253 | " at cycle %d / polling\n", |
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254 | x , y , p , cmd_id, _get_proctime() ); |
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255 | #endif |
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256 | // disable IRQs in PXIE register |
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257 | _hba_set_register( HBA_PXIE , 0 ); |
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258 | |
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259 | // poll PXCI[cmd_id] until command completed by HBA |
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260 | do |
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261 | { |
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262 | pxci = _hba_get_register( HBA_PXCI ); |
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263 | |
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264 | #if GIET_DEBUG_IOC |
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265 | if (_get_proctime() > GIET_DEBUG_IOC) |
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266 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] wait on HBA_PXCI / pxci = %x\n", |
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267 | x , y , p , pxci ); |
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268 | #endif |
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269 | } |
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270 | while( pxci & (1<<cmd_id) ); |
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271 | |
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272 | // get PXIS register |
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273 | pxis = _hba_get_register( HBA_PXIS ); |
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274 | |
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275 | // reset PXIS register |
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276 | _hba_set_register( HBA_PXIS , 0 ); |
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277 | } |
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278 | |
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279 | ///////////////////////////////////////////////////////////////// |
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280 | // in descheduling mode, we deschedule the thread |
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281 | // and use an interrupt to reschedule the thread. |
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282 | // We need a critical section, because we must set the NORUN bit |
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283 | // before to launch the transfer, and we don't want to be |
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284 | // descheduled between these two operations. |
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285 | ///////////////////////////////////////////////////////////////// |
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286 | else |
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287 | { |
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288 | |
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289 | #if GIET_DEBUG_IOC |
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290 | if (_get_proctime() > GIET_DEBUG_IOC) |
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291 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] get slot %d in Cmd List " |
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292 | "at cycle %d / descheduling\n", |
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293 | x , y , p , cmd_id, _get_proctime() ); |
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294 | #endif |
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295 | unsigned int save_sr; |
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296 | unsigned int ltid = _get_thread_ltid(); |
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297 | |
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298 | // activates HBA interrupts |
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299 | _hba_set_register( HBA_PXIE , 0x00000001 ); |
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300 | |
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301 | // set _hba_trid[cmd_id] |
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302 | _hba_trid[cmd_id] = (x<<24) + (y<<16) + (p<<8) + ltid; |
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303 | |
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304 | // enters critical section |
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305 | _it_disable( &save_sr ); |
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306 | |
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307 | // Set NORUN_MASK_IOC bit |
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308 | static_scheduler_t* psched = (static_scheduler_t*)_schedulers[x][y][p]; |
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309 | unsigned int* ptr = &psched->context[ltid].slot[CTX_NORUN_ID]; |
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310 | _atomic_or( ptr , NORUN_MASK_IOC ); |
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311 | |
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312 | // start HBA transfer |
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313 | _hba_set_register( HBA_PXCI, (1<<cmd_id) ); |
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314 | |
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315 | // set _hba_active_cmd[cmd_id] |
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316 | _hba_active_cmd[cmd_id] = 1; |
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317 | |
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318 | // deschedule thread |
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319 | _ctx_switch(); |
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320 | |
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321 | #if GIET_DEBUG_IOC |
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322 | if (_get_proctime() > GIET_DEBUG_IOC) |
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323 | _printf("\n[DEBUG HBA] _hba_access() : thread %d on P[%d,%d,%d] resume at cycle %d\n", |
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324 | ltid , x , y , p , _get_proctime() ); |
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325 | #endif |
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326 | |
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327 | // restore SR |
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328 | _it_restore( &save_sr ); |
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329 | |
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330 | // get command status |
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331 | pxis = _hba_status; |
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332 | } |
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333 | |
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334 | // release the cmd index |
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335 | unsigned int release_success; |
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336 | release_success = _hba_cmd_release(cmd_id); |
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337 | |
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338 | #if GIET_DEBUG_IOC |
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339 | if (_get_proctime() > GIET_DEBUG_IOC) |
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340 | _printf("\n[DEBUG HBA] _hba_access() : P[%d,%d,%d] release slot %d in Cmd List " |
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341 | "and exit at cycle %d\n", |
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342 | x , y , p, cmd_id, |
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343 | _get_proctime() ); |
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344 | #endif |
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345 | |
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346 | if ( release_success != 0 ) return -1; |
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347 | else if ( pxis & 0x40000000 ) return pxis; |
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348 | else return 0; |
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349 | |
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350 | } // end _hba_access() |
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351 | |
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352 | |
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353 | //////////////////////// |
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354 | unsigned int _hba_init() |
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355 | { |
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356 | unsigned int cmd_list_vaddr; |
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357 | unsigned int cmd_table_vaddr; |
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358 | unsigned long long cmd_list_paddr; |
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359 | unsigned long long cmd_table_paddr; |
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360 | unsigned int flags; // unused |
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361 | |
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362 | // compute Command list & command table physical addresses |
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363 | cmd_list_vaddr = (unsigned int)(&_hba_cmd_list[0]); |
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364 | cmd_table_vaddr = (unsigned int)(&_hba_cmd_table[0]); |
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365 | if ( _get_mmu_mode() & 0x4 ) |
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366 | { |
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367 | cmd_list_paddr = _v2p_translate( cmd_list_vaddr , &flags ); |
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368 | cmd_table_paddr = _v2p_translate( cmd_table_vaddr , &flags ); |
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369 | } |
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370 | else |
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371 | { |
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372 | cmd_list_paddr = (unsigned long long)cmd_list_vaddr; |
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373 | cmd_table_paddr = (unsigned long long)cmd_table_vaddr; |
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374 | } |
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375 | |
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376 | // initialise allocator lock if not in boot mode |
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377 | if ( !_hba_boot_mode ) |
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378 | _sqt_lock_init(&_hba_lock); |
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379 | |
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380 | // initialise Command Descriptors in Command List, allocated command table |
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381 | // and active command table |
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382 | unsigned int c; |
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383 | unsigned long long paddr; |
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384 | for( c=0 ; c<32 ; c++ ) |
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385 | { |
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386 | paddr = cmd_table_paddr + c * sizeof(hba_cmd_table_t); |
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387 | _hba_cmd_list[c].ctba = (unsigned int)(paddr); |
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388 | _hba_cmd_list[c].ctbau = (unsigned int)(paddr>>32); |
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389 | _hba_allocated_cmd[c] = 0; |
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390 | _hba_active_cmd[c] = 0; |
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391 | } |
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392 | |
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393 | // initialise HBA registers |
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394 | _hba_set_register( HBA_PXCLB , (unsigned int)(cmd_list_paddr) ); |
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395 | _hba_set_register( HBA_PXCLBU , (unsigned int)(cmd_list_paddr>>32) ); |
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396 | _hba_set_register( HBA_PXIE , 0 ); |
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397 | _hba_set_register( HBA_PXIS , 0 ); |
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398 | _hba_set_register( HBA_PXCI , 0 ); |
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399 | _hba_set_register( HBA_PXCMD , 1 ); |
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400 | |
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401 | return 0; |
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402 | } |
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403 | |
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404 | |
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405 | ///////////////////////////////////////////////////// |
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406 | void _hba_isr( unsigned int irq_type, // HWI / WTI |
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407 | unsigned int irq_id, // index returned by ICU |
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408 | unsigned int channel ) // unused |
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409 | { |
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410 | // save PXIS register if there is no previous error |
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411 | if ( !(_hba_status & 0x40000000)) |
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412 | _hba_status = _hba_get_register( HBA_PXIS ); |
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413 | |
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414 | // reset PXIS register |
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415 | _hba_set_register( HBA_PXIS , 0 ); |
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416 | |
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417 | unsigned int cmd_id; // cmd index for the loops |
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418 | |
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419 | // save the current list of active cmd in a 32 bits word |
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420 | unsigned int current_active_cmd = 0; |
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421 | for ( cmd_id = 0 ; cmd_id < 32 ; cmd_id ++ ) |
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422 | { |
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423 | if ( _hba_active_cmd[cmd_id] == 1 ) current_active_cmd += (1 << cmd_id); |
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424 | } |
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425 | |
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426 | // get HBA_PXCI containing commands status |
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427 | unsigned int current_pxci = _hba_get_register( HBA_PXCI ); |
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428 | |
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429 | for ( cmd_id = 0 ; cmd_id < 32 ; cmd_id ++ ) |
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430 | { |
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431 | if ( ( (current_active_cmd & (1<<cmd_id)) != 0) && // active command |
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432 | ( (current_pxci & (1<<cmd_id)) == 0 ) ) // completed command |
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433 | { |
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434 | // desactivate the command |
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435 | _hba_active_cmd[cmd_id] = 0; |
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436 | |
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437 | // identify waiting thread |
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438 | unsigned int x = (_hba_trid[cmd_id]>>24) & 0xFF; |
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439 | unsigned int y = (_hba_trid[cmd_id]>>16) & 0xFF; |
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440 | unsigned int p = (_hba_trid[cmd_id]>> 8) & 0xFF; |
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441 | unsigned int ltid = (_hba_trid[cmd_id] ) & 0xFF; |
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442 | |
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443 | // Reset NORUN_MASK_IOC bit |
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444 | static_scheduler_t* psched = (static_scheduler_t*)_schedulers[x][y][p]; |
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445 | _atomic_and( &psched->context[ltid].slot[CTX_NORUN_ID] , ~NORUN_MASK_IOC ); |
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446 | |
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447 | // send a WAKUP WTI to processor running the waiting thread |
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448 | _xcu_send_wti( (x<<Y_WIDTH) + y, |
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449 | p , |
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450 | 0 ); // don't force context switch |
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451 | |
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452 | #if GIET_DEBUG_IOC |
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453 | if (_get_proctime() > GIET_DEBUG_IOC) |
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454 | _printf("\n[DEBUG HBA] _hba_isr() : command %d completed at cycle %d\n" |
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455 | " resume thread %d running on P[%d,%d,%d]\n", |
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456 | cmd_id , _get_proctime() , |
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457 | ltid , x , y , p ); |
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458 | #endif |
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459 | } |
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460 | } |
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461 | } // end _hba_isr() |
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462 | |
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463 | // Local Variables: |
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464 | // tab-width: 4 |
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465 | // c-basic-offset: 4 |
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466 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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467 | // indent-tabs-mode: nil |
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468 | // End: |
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469 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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470 | |
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