1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright(c) 1999 - 2018 Intel Corporation. */ 3 4 #include <linux/pci.h> 5 #include <linux/delay.h> 6 #include "ixgbe.h" 7 #include "ixgbe_mbx.h" 8 9 /** 10 * ixgbe_read_mbx - Reads a message from the mailbox 11 * @hw: pointer to the HW structure 12 * @msg: The message buffer 13 * @size: Length of buffer 14 * @mbx_id: id of mailbox to read 15 * 16 * returns SUCCESS if it successfully read message from buffer 17 **/ 18 s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id) 19 { 20 struct ixgbe_mbx_info *mbx = &hw->mbx; 21 22 /* limit read to size of mailbox */ 23 if (size > mbx->size) 24 size = mbx->size; 25 26 if (!mbx->ops) 27 return -EIO; 28 29 return mbx->ops->read(hw, msg, size, mbx_id); 30 } 31 32 /** 33 * ixgbe_write_mbx - Write a message to the mailbox 34 * @hw: pointer to the HW structure 35 * @msg: The message buffer 36 * @size: Length of buffer 37 * @mbx_id: id of mailbox to write 38 * 39 * returns SUCCESS if it successfully copied message into the buffer 40 **/ 41 s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id) 42 { 43 struct ixgbe_mbx_info *mbx = &hw->mbx; 44 45 if (size > mbx->size) 46 return -EINVAL; 47 48 if (!mbx->ops) 49 return -EIO; 50 51 return mbx->ops->write(hw, msg, size, mbx_id); 52 } 53 54 /** 55 * ixgbe_check_for_msg - checks to see if someone sent us mail 56 * @hw: pointer to the HW structure 57 * @mbx_id: id of mailbox to check 58 * 59 * returns SUCCESS if the Status bit was found or else ERR_MBX 60 **/ 61 s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id) 62 { 63 struct ixgbe_mbx_info *mbx = &hw->mbx; 64 65 if (!mbx->ops) 66 return -EIO; 67 68 return mbx->ops->check_for_msg(hw, mbx_id); 69 } 70 71 /** 72 * ixgbe_check_for_ack - checks to see if someone sent us ACK 73 * @hw: pointer to the HW structure 74 * @mbx_id: id of mailbox to check 75 * 76 * returns SUCCESS if the Status bit was found or else ERR_MBX 77 **/ 78 s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id) 79 { 80 struct ixgbe_mbx_info *mbx = &hw->mbx; 81 82 if (!mbx->ops) 83 return -EIO; 84 85 return mbx->ops->check_for_ack(hw, mbx_id); 86 } 87 88 /** 89 * ixgbe_check_for_rst - checks to see if other side has reset 90 * @hw: pointer to the HW structure 91 * @mbx_id: id of mailbox to check 92 * 93 * returns SUCCESS if the Status bit was found or else ERR_MBX 94 **/ 95 s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id) 96 { 97 struct ixgbe_mbx_info *mbx = &hw->mbx; 98 99 if (!mbx->ops) 100 return -EIO; 101 102 return mbx->ops->check_for_rst(hw, mbx_id); 103 } 104 105 /** 106 * ixgbe_poll_for_msg - Wait for message notification 107 * @hw: pointer to the HW structure 108 * @mbx_id: id of mailbox to write 109 * 110 * returns SUCCESS if it successfully received a message notification 111 **/ 112 static s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id) 113 { 114 struct ixgbe_mbx_info *mbx = &hw->mbx; 115 int countdown = mbx->timeout; 116 117 if (!countdown || !mbx->ops) 118 return -EIO; 119 120 while (mbx->ops->check_for_msg(hw, mbx_id)) { 121 countdown--; 122 if (!countdown) 123 return -EIO; 124 udelay(mbx->usec_delay); 125 } 126 127 return 0; 128 } 129 130 /** 131 * ixgbe_poll_for_ack - Wait for message acknowledgement 132 * @hw: pointer to the HW structure 133 * @mbx_id: id of mailbox to write 134 * 135 * returns SUCCESS if it successfully received a message acknowledgement 136 **/ 137 static s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id) 138 { 139 struct ixgbe_mbx_info *mbx = &hw->mbx; 140 int countdown = mbx->timeout; 141 142 if (!countdown || !mbx->ops) 143 return -EIO; 144 145 while (mbx->ops->check_for_ack(hw, mbx_id)) { 146 countdown--; 147 if (!countdown) 148 return -EIO; 149 udelay(mbx->usec_delay); 150 } 151 152 return 0; 153 } 154 155 /** 156 * ixgbe_read_posted_mbx - Wait for message notification and receive message 157 * @hw: pointer to the HW structure 158 * @msg: The message buffer 159 * @size: Length of buffer 160 * @mbx_id: id of mailbox to write 161 * 162 * returns SUCCESS if it successfully received a message notification and 163 * copied it into the receive buffer. 164 **/ 165 static s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, 166 u16 mbx_id) 167 { 168 struct ixgbe_mbx_info *mbx = &hw->mbx; 169 s32 ret_val; 170 171 if (!mbx->ops) 172 return -EIO; 173 174 ret_val = ixgbe_poll_for_msg(hw, mbx_id); 175 if (ret_val) 176 return ret_val; 177 178 /* if ack received read message */ 179 return mbx->ops->read(hw, msg, size, mbx_id); 180 } 181 182 /** 183 * ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack 184 * @hw: pointer to the HW structure 185 * @msg: The message buffer 186 * @size: Length of buffer 187 * @mbx_id: id of mailbox to write 188 * 189 * returns SUCCESS if it successfully copied message into the buffer and 190 * received an ack to that message within delay * timeout period 191 **/ 192 static s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, 193 u16 mbx_id) 194 { 195 struct ixgbe_mbx_info *mbx = &hw->mbx; 196 s32 ret_val; 197 198 /* exit if either we can't write or there isn't a defined timeout */ 199 if (!mbx->ops || !mbx->timeout) 200 return -EIO; 201 202 /* send msg */ 203 ret_val = mbx->ops->write(hw, msg, size, mbx_id); 204 if (ret_val) 205 return ret_val; 206 207 /* if msg sent wait until we receive an ack */ 208 return ixgbe_poll_for_ack(hw, mbx_id); 209 } 210 211 static s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index) 212 { 213 u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index)); 214 215 if (mbvficr & mask) { 216 IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask); 217 return 0; 218 } 219 220 return -EIO; 221 } 222 223 /** 224 * ixgbe_check_for_msg_pf - checks to see if the VF has sent mail 225 * @hw: pointer to the HW structure 226 * @vf_number: the VF index 227 * 228 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX 229 **/ 230 static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number) 231 { 232 s32 index = IXGBE_MBVFICR_INDEX(vf_number); 233 u32 vf_bit = vf_number % 16; 234 235 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit, 236 index)) { 237 hw->mbx.stats.reqs++; 238 return 0; 239 } 240 241 return -EIO; 242 } 243 244 /** 245 * ixgbe_check_for_ack_pf - checks to see if the VF has ACKed 246 * @hw: pointer to the HW structure 247 * @vf_number: the VF index 248 * 249 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX 250 **/ 251 static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number) 252 { 253 s32 index = IXGBE_MBVFICR_INDEX(vf_number); 254 u32 vf_bit = vf_number % 16; 255 256 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit, 257 index)) { 258 hw->mbx.stats.acks++; 259 return 0; 260 } 261 262 return -EIO; 263 } 264 265 /** 266 * ixgbe_check_for_rst_pf - checks to see if the VF has reset 267 * @hw: pointer to the HW structure 268 * @vf_number: the VF index 269 * 270 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX 271 **/ 272 static s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number) 273 { 274 u32 reg_offset = (vf_number < 32) ? 0 : 1; 275 u32 vf_shift = vf_number % 32; 276 u32 vflre = 0; 277 278 switch (hw->mac.type) { 279 case ixgbe_mac_82599EB: 280 vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset)); 281 break; 282 case ixgbe_mac_X540: 283 case ixgbe_mac_X550: 284 case ixgbe_mac_X550EM_x: 285 case ixgbe_mac_x550em_a: 286 vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset)); 287 break; 288 default: 289 break; 290 } 291 292 if (vflre & BIT(vf_shift)) { 293 IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), BIT(vf_shift)); 294 hw->mbx.stats.rsts++; 295 return 0; 296 } 297 298 return -EIO; 299 } 300 301 /** 302 * ixgbe_obtain_mbx_lock_pf - obtain mailbox lock 303 * @hw: pointer to the HW structure 304 * @vf_number: the VF index 305 * 306 * return SUCCESS if we obtained the mailbox lock 307 **/ 308 static s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number) 309 { 310 u32 p2v_mailbox; 311 312 /* Take ownership of the buffer */ 313 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU); 314 315 /* reserve mailbox for vf use */ 316 p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number)); 317 if (p2v_mailbox & IXGBE_PFMAILBOX_PFU) 318 return 0; 319 320 return -EIO; 321 } 322 323 /** 324 * ixgbe_write_mbx_pf - Places a message in the mailbox 325 * @hw: pointer to the HW structure 326 * @msg: The message buffer 327 * @size: Length of buffer 328 * @vf_number: the VF index 329 * 330 * returns SUCCESS if it successfully copied message into the buffer 331 **/ 332 static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size, 333 u16 vf_number) 334 { 335 s32 ret_val; 336 u16 i; 337 338 /* lock the mailbox to prevent pf/vf race condition */ 339 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number); 340 if (ret_val) 341 return ret_val; 342 343 /* flush msg and acks as we are overwriting the message buffer */ 344 ixgbe_check_for_msg_pf(hw, vf_number); 345 ixgbe_check_for_ack_pf(hw, vf_number); 346 347 /* copy the caller specified message to the mailbox memory buffer */ 348 for (i = 0; i < size; i++) 349 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]); 350 351 /* Interrupt VF to tell it a message has been sent and release buffer*/ 352 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS); 353 354 /* update stats */ 355 hw->mbx.stats.msgs_tx++; 356 357 return 0; 358 } 359 360 /** 361 * ixgbe_read_mbx_pf - Read a message from the mailbox 362 * @hw: pointer to the HW structure 363 * @msg: The message buffer 364 * @size: Length of buffer 365 * @vf_number: the VF index 366 * 367 * This function copies a message from the mailbox buffer to the caller's 368 * memory buffer. The presumption is that the caller knows that there was 369 * a message due to a VF request so no polling for message is needed. 370 **/ 371 static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size, 372 u16 vf_number) 373 { 374 s32 ret_val; 375 u16 i; 376 377 /* lock the mailbox to prevent pf/vf race condition */ 378 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number); 379 if (ret_val) 380 return ret_val; 381 382 /* copy the message to the mailbox memory buffer */ 383 for (i = 0; i < size; i++) 384 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i); 385 386 /* Acknowledge the message and release buffer */ 387 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK); 388 389 /* update stats */ 390 hw->mbx.stats.msgs_rx++; 391 392 return 0; 393 } 394 395 #ifdef CONFIG_PCI_IOV 396 /** 397 * ixgbe_init_mbx_params_pf - set initial values for pf mailbox 398 * @hw: pointer to the HW structure 399 * 400 * Initializes the hw->mbx struct to correct values for pf mailbox 401 */ 402 void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw) 403 { 404 struct ixgbe_mbx_info *mbx = &hw->mbx; 405 406 if (hw->mac.type != ixgbe_mac_82599EB && 407 hw->mac.type != ixgbe_mac_X550 && 408 hw->mac.type != ixgbe_mac_X550EM_x && 409 hw->mac.type != ixgbe_mac_x550em_a && 410 hw->mac.type != ixgbe_mac_X540) 411 return; 412 413 mbx->timeout = 0; 414 mbx->usec_delay = 0; 415 416 mbx->stats.msgs_tx = 0; 417 mbx->stats.msgs_rx = 0; 418 mbx->stats.reqs = 0; 419 mbx->stats.acks = 0; 420 mbx->stats.rsts = 0; 421 422 mbx->size = IXGBE_VFMAILBOX_SIZE; 423 } 424 #endif /* CONFIG_PCI_IOV */ 425 426 const struct ixgbe_mbx_operations mbx_ops_generic = { 427 .read = ixgbe_read_mbx_pf, 428 .write = ixgbe_write_mbx_pf, 429 .read_posted = ixgbe_read_posted_mbx, 430 .write_posted = ixgbe_write_posted_mbx, 431 .check_for_msg = ixgbe_check_for_msg_pf, 432 .check_for_ack = ixgbe_check_for_ack_pf, 433 .check_for_rst = ixgbe_check_for_rst_pf, 434 }; 435 436