drivers/scsi/smartpqi/smartpqi_sas_transport.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    driver for Microsemi PQI-based storage controllers
   4  *    Copyright (c) 2019-2020 Microchip Technology Inc. and its subsidiaries
   5  *    Copyright (c) 2016-2018 Microsemi Corporation
   6  *    Copyright (c) 2016 PMC-Sierra, Inc.
   7  *
   8  *    Questions/Comments/Bugfixes to storagedev@microchip.com
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/bsg-lib.h>
  14 #include <scsi/scsi_host.h>
  15 #include <scsi/scsi_cmnd.h>
  16 #include <scsi/scsi_transport_sas.h>
  17 #include <asm/unaligned.h>
  18 #include "smartpqi.h"
  19
  20 static struct pqi_sas_phy *pqi_alloc_sas_phy(struct pqi_sas_port *pqi_sas_port)
  21 {
  22         struct pqi_sas_phy *pqi_sas_phy;
  23         struct sas_phy *phy;
  24
  25         pqi_sas_phy = kzalloc(sizeof(*pqi_sas_phy), GFP_KERNEL);
  26         if (!pqi_sas_phy)
  27                 return NULL;
  28
  29         phy = sas_phy_alloc(pqi_sas_port->parent_node->parent_dev,
  30                 pqi_sas_port->next_phy_index);
  31         if (!phy) {
  32                 kfree(pqi_sas_phy);
  33                 return NULL;
  34         }
  35
  36         pqi_sas_port->next_phy_index++;
  37         pqi_sas_phy->phy = phy;
  38         pqi_sas_phy->parent_port = pqi_sas_port;
  39
  40         return pqi_sas_phy;
  41 }
  42
  43 static void pqi_free_sas_phy(struct pqi_sas_phy *pqi_sas_phy)
  44 {
  45         struct sas_phy *phy = pqi_sas_phy->phy;
  46
  47         sas_port_delete_phy(pqi_sas_phy->parent_port->port, phy);
  48         if (pqi_sas_phy->added_to_port)
  49                 list_del(&pqi_sas_phy->phy_list_entry);
  50         sas_phy_delete(phy);
  51         kfree(pqi_sas_phy);
  52 }
  53
  54 static int pqi_sas_port_add_phy(struct pqi_sas_phy *pqi_sas_phy)
  55 {
  56         int rc;
  57         struct pqi_sas_port *pqi_sas_port;
  58         struct sas_phy *phy;
  59         struct sas_identify *identify;
  60
  61         pqi_sas_port = pqi_sas_phy->parent_port;
  62         phy = pqi_sas_phy->phy;
  63
  64         identify = &phy->identify;
  65         memset(identify, 0, sizeof(*identify));
  66         identify->sas_address = pqi_sas_port->sas_address;
  67         identify->device_type = SAS_END_DEVICE;
  68         identify->initiator_port_protocols = SAS_PROTOCOL_ALL;
  69         identify->target_port_protocols = SAS_PROTOCOL_ALL;
  70         phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
  71         phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
  72         phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
  73         phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
  74         phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
  75
  76         rc = sas_phy_add(pqi_sas_phy->phy);
  77         if (rc)
  78                 return rc;
  79
  80         sas_port_add_phy(pqi_sas_port->port, pqi_sas_phy->phy);
  81         list_add_tail(&pqi_sas_phy->phy_list_entry,
  82                 &pqi_sas_port->phy_list_head);
  83         pqi_sas_phy->added_to_port = true;
  84
  85         return 0;
  86 }
  87
  88 static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
  89         struct sas_rphy *rphy)
  90 {
  91         struct sas_identify *identify;
  92
  93         identify = &rphy->identify;
  94         identify->sas_address = pqi_sas_port->sas_address;
  95
  96         identify->initiator_port_protocols = SAS_PROTOCOL_ALL;
  97         identify->target_port_protocols = SAS_PROTOCOL_STP;
  98
  99         if (pqi_sas_port->device) {
 100                 identify->phy_identifier = pqi_sas_port->device->phy_id;
 101                 switch (pqi_sas_port->device->device_type) {
 102                 case SA_DEVICE_TYPE_SAS:
 103                 case SA_DEVICE_TYPE_SES:
 104                 case SA_DEVICE_TYPE_NVME:
 105                         identify->target_port_protocols = SAS_PROTOCOL_SSP;
 106                         break;
 107                 case SA_DEVICE_TYPE_EXPANDER_SMP:
 108                         identify->target_port_protocols = SAS_PROTOCOL_SMP;
 109                         break;
 110                 case SA_DEVICE_TYPE_SATA:
 111                 default:
 112                         break;
 113                 }
 114         }
 115
 116         return sas_rphy_add(rphy);
 117 }
 118
 119 static struct sas_rphy *pqi_sas_rphy_alloc(struct pqi_sas_port *pqi_sas_port)
 120 {
 121         if (pqi_sas_port->device && pqi_sas_port->device->is_expander_smp_device)
 122                 return sas_expander_alloc(pqi_sas_port->port,
 123                                 SAS_FANOUT_EXPANDER_DEVICE);
 124
 125         return sas_end_device_alloc(pqi_sas_port->port);
 126 }
 127
 128 static struct pqi_sas_port *pqi_alloc_sas_port(
 129         struct pqi_sas_node *pqi_sas_node, u64 sas_address,
 130         struct pqi_scsi_dev *device)
 131 {
 132         int rc;
 133         struct pqi_sas_port *pqi_sas_port;
 134         struct sas_port *port;
 135
 136         pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
 137         if (!pqi_sas_port)
 138                 return NULL;
 139
 140         INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
 141         pqi_sas_port->parent_node = pqi_sas_node;
 142
 143         port = sas_port_alloc_num(pqi_sas_node->parent_dev);
 144         if (!port)
 145                 goto free_pqi_port;
 146
 147         rc = sas_port_add(port);
 148         if (rc)
 149                 goto free_sas_port;
 150
 151         pqi_sas_port->port = port;
 152         pqi_sas_port->sas_address = sas_address;
 153         pqi_sas_port->device = device;
 154         list_add_tail(&pqi_sas_port->port_list_entry,
 155                 &pqi_sas_node->port_list_head);
 156
 157         return pqi_sas_port;
 158
 159 free_sas_port:
 160         sas_port_free(port);
 161 free_pqi_port:
 162         kfree(pqi_sas_port);
 163
 164         return NULL;
 165 }
 166
 167 static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
 168 {
 169         struct pqi_sas_phy *pqi_sas_phy;
 170         struct pqi_sas_phy *next;
 171
 172         list_for_each_entry_safe(pqi_sas_phy, next,
 173                 &pqi_sas_port->phy_list_head, phy_list_entry)
 174                         pqi_free_sas_phy(pqi_sas_phy);
 175
 176         sas_port_delete(pqi_sas_port->port);
 177         list_del(&pqi_sas_port->port_list_entry);
 178         kfree(pqi_sas_port);
 179 }
 180
 181 static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
 182 {
 183         struct pqi_sas_node *pqi_sas_node;
 184
 185         pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
 186         if (pqi_sas_node) {
 187                 pqi_sas_node->parent_dev = parent_dev;
 188                 INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
 189         }
 190
 191         return pqi_sas_node;
 192 }
 193
 194 static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
 195 {
 196         struct pqi_sas_port *pqi_sas_port;
 197         struct pqi_sas_port *next;
 198
 199         if (!pqi_sas_node)
 200                 return;
 201
 202         list_for_each_entry_safe(pqi_sas_port, next,
 203                 &pqi_sas_node->port_list_head, port_list_entry)
 204                         pqi_free_sas_port(pqi_sas_port);
 205
 206         kfree(pqi_sas_node);
 207 }
 208
 209 struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
 210         struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
 211 {
 212         struct pqi_scsi_dev *device;
 213
 214         list_for_each_entry(device, &ctrl_info->scsi_device_list,
 215                 scsi_device_list_entry) {
 216                 if (!device->sas_port)
 217                         continue;
 218                 if (device->sas_port->rphy == rphy)
 219                         return device;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
 226 {
 227         int rc;
 228         struct device *parent_dev;
 229         struct pqi_sas_node *pqi_sas_node;
 230         struct pqi_sas_port *pqi_sas_port;
 231         struct pqi_sas_phy *pqi_sas_phy;
 232
 233         parent_dev = &shost->shost_dev;
 234
 235         pqi_sas_node = pqi_alloc_sas_node(parent_dev);
 236         if (!pqi_sas_node)
 237                 return -ENOMEM;
 238
 239         pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
 240                 ctrl_info->sas_address, NULL);
 241         if (!pqi_sas_port) {
 242                 rc = -ENODEV;
 243                 goto free_sas_node;
 244         }
 245
 246         pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
 247         if (!pqi_sas_phy) {
 248                 rc = -ENODEV;
 249                 goto free_sas_port;
 250         }
 251
 252         rc = pqi_sas_port_add_phy(pqi_sas_phy);
 253         if (rc)
 254                 goto free_sas_phy;
 255
 256         ctrl_info->sas_host = pqi_sas_node;
 257
 258         return 0;
 259
 260 free_sas_phy:
 261         pqi_free_sas_phy(pqi_sas_phy);
 262 free_sas_port:
 263         pqi_free_sas_port(pqi_sas_port);
 264 free_sas_node:
 265         pqi_free_sas_node(pqi_sas_node);
 266
 267         return rc;
 268 }
 269
 270 void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
 271 {
 272         pqi_free_sas_node(ctrl_info->sas_host);
 273 }
 274
 275 int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
 276         struct pqi_scsi_dev *device)
 277 {
 278         int rc;
 279         struct pqi_sas_port *pqi_sas_port;
 280         struct sas_rphy *rphy;
 281
 282         pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
 283                 device->sas_address, device);
 284         if (!pqi_sas_port)
 285                 return -ENOMEM;
 286
 287         rphy = pqi_sas_rphy_alloc(pqi_sas_port);
 288         if (!rphy) {
 289                 rc = -ENODEV;
 290                 goto free_sas_port;
 291         }
 292
 293         pqi_sas_port->rphy = rphy;
 294         device->sas_port = pqi_sas_port;
 295
 296         rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
 297         if (rc)
 298                 goto free_sas_port;
 299
 300         return 0;
 301
 302 free_sas_port:
 303         pqi_free_sas_port(pqi_sas_port);
 304         device->sas_port = NULL;
 305
 306         return rc;
 307 }
 308
 309 void pqi_remove_sas_device(struct pqi_scsi_dev *device)
 310 {
 311         if (device->sas_port) {
 312                 pqi_free_sas_port(device->sas_port);
 313                 device->sas_port = NULL;
 314         }
 315 }
 316
 317 static int pqi_sas_get_linkerrors(struct sas_phy *phy)
 318 {
 319         return 0;
 320 }
 321
 322 static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
 323         u64 *identifier)
 324 {
 325         int rc;
 326         unsigned long flags;
 327         struct Scsi_Host *shost;
 328         struct pqi_ctrl_info *ctrl_info;
 329         struct pqi_scsi_dev *found_device;
 330         struct pqi_scsi_dev *device;
 331
 332         if (!rphy)
 333                 return -ENODEV;
 334
 335         shost = rphy_to_shost(rphy);
 336         ctrl_info = shost_to_hba(shost);
 337         spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
 338         found_device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
 339
 340         if (!found_device) {
 341                 rc = -ENODEV;
 342                 goto out;
 343         }
 344
 345         if (found_device->devtype == TYPE_ENCLOSURE) {
 346                 *identifier = get_unaligned_be64(&found_device->wwid);
 347                 rc = 0;
 348                 goto out;
 349         }
 350
 351         if (found_device->box_index == 0xff ||
 352                 found_device->phys_box_on_bus == 0 ||
 353                 found_device->bay == 0xff) {
 354                 rc = -EINVAL;
 355                 goto out;
 356         }
 357
 358         list_for_each_entry(device, &ctrl_info->scsi_device_list,
 359                 scsi_device_list_entry) {
 360                 if (device->devtype == TYPE_ENCLOSURE &&
 361                         device->box_index == found_device->box_index &&
 362                         device->phys_box_on_bus ==
 363                                 found_device->phys_box_on_bus &&
 364                         memcmp(device->phys_connector,
 365                                 found_device->phys_connector, 2) == 0) {
 366                         *identifier =
 367                                 get_unaligned_be64(&device->wwid);
 368                         rc = 0;
 369                         goto out;
 370                 }
 371         }
 372
 373         if (found_device->phy_connected_dev_type != SA_DEVICE_TYPE_CONTROLLER) {
 374                 rc = -EINVAL;
 375                 goto out;
 376         }
 377
 378         list_for_each_entry(device, &ctrl_info->scsi_device_list,
 379                 scsi_device_list_entry) {
 380                 if (device->devtype == TYPE_ENCLOSURE &&
 381                         CISS_GET_DRIVE_NUMBER(device->scsi3addr) ==
 382                                 PQI_VSEP_CISS_BTL) {
 383                         *identifier = get_unaligned_be64(&device->wwid);
 384                         rc = 0;
 385                         goto out;
 386                 }
 387         }
 388
 389         rc = -EINVAL;
 390 out:
 391         spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
 392
 393         return rc;
 394 }
 395
 396 static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
 397 {
 398         int rc;
 399         unsigned long flags;
 400         struct pqi_ctrl_info *ctrl_info;
 401         struct pqi_scsi_dev *device;
 402         struct Scsi_Host *shost;
 403
 404         if (!rphy)
 405                 return -ENODEV;
 406
 407         shost = rphy_to_shost(rphy);
 408         ctrl_info = shost_to_hba(shost);
 409         spin_lock_irqsave(&ctrl_info->scsi_device_list_lock, flags);
 410         device = pqi_find_device_by_sas_rphy(ctrl_info, rphy);
 411
 412         if (!device) {
 413                 rc = -ENODEV;
 414                 goto out;
 415         }
 416
 417         if (device->bay == 0xff)
 418                 rc = -EINVAL;
 419         else
 420                 rc = device->bay;
 421
 422 out:
 423         spin_unlock_irqrestore(&ctrl_info->scsi_device_list_lock, flags);
 424
 425         return rc;
 426 }
 427
 428 static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
 429 {
 430         return 0;
 431 }
 432
 433 static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
 434 {
 435         return 0;
 436 }
 437
 438 static int pqi_sas_phy_setup(struct sas_phy *phy)
 439 {
 440         return 0;
 441 }
 442
 443 static void pqi_sas_phy_release(struct sas_phy *phy)
 444 {
 445 }
 446
 447 static int pqi_sas_phy_speed(struct sas_phy *phy,
 448         struct sas_phy_linkrates *rates)
 449 {
 450         return -EINVAL;
 451 }
 452
 453 #define CSMI_IOCTL_TIMEOUT      60
 454 #define SMP_CRC_FIELD_LENGTH    4
 455
 456 static struct bmic_csmi_smp_passthru_buffer *
 457 pqi_build_csmi_smp_passthru_buffer(struct sas_rphy *rphy,
 458         struct bsg_job *job)
 459 {
 460         struct bmic_csmi_smp_passthru_buffer *smp_buf;
 461         struct bmic_csmi_ioctl_header *ioctl_header;
 462         struct bmic_csmi_smp_passthru *parameters;
 463         u32 req_size;
 464         u32 resp_size;
 465
 466         smp_buf = kzalloc(sizeof(*smp_buf), GFP_KERNEL);
 467         if (!smp_buf)
 468                 return NULL;
 469
 470         req_size = job->request_payload.payload_len;
 471         resp_size = job->reply_payload.payload_len;
 472
 473         ioctl_header = &smp_buf->ioctl_header;
 474         put_unaligned_le32(sizeof(smp_buf->ioctl_header),
 475                 &ioctl_header->header_length);
 476         put_unaligned_le32(CSMI_IOCTL_TIMEOUT, &ioctl_header->timeout);
 477         put_unaligned_le32(CSMI_CC_SAS_SMP_PASSTHRU,
 478                 &ioctl_header->control_code);
 479         put_unaligned_le32(sizeof(smp_buf->parameters), &ioctl_header->length);
 480
 481         parameters = &smp_buf->parameters;
 482         parameters->phy_identifier = rphy->identify.phy_identifier;
 483         parameters->port_identifier = 0;
 484         parameters->connection_rate = 0;
 485         put_unaligned_be64(rphy->identify.sas_address,
 486                 &parameters->destination_sas_address);
 487
 488         if (req_size > SMP_CRC_FIELD_LENGTH)
 489                 req_size -= SMP_CRC_FIELD_LENGTH;
 490
 491         put_unaligned_le32(req_size, &parameters->request_length);
 492         put_unaligned_le32(resp_size, &parameters->response_length);
 493
 494         sg_copy_to_buffer(job->request_payload.sg_list,
 495                 job->reply_payload.sg_cnt, &parameters->request,
 496                 req_size);
 497
 498         return smp_buf;
 499 }
 500
 501 static unsigned int pqi_build_sas_smp_handler_reply(
 502         struct bmic_csmi_smp_passthru_buffer *smp_buf, struct bsg_job *job,
 503         struct pqi_raid_error_info *error_info)
 504 {
 505         sg_copy_from_buffer(job->reply_payload.sg_list,
 506                 job->reply_payload.sg_cnt, &smp_buf->parameters.response,
 507                 le32_to_cpu(smp_buf->parameters.response_length));
 508
 509         job->reply_len = le16_to_cpu(error_info->sense_data_length);
 510         memcpy(job->reply, error_info->data,
 511                 le16_to_cpu(error_info->sense_data_length));
 512
 513         return job->reply_payload.payload_len -
 514                 get_unaligned_le32(&error_info->data_in_transferred);
 515 }
 516
 517 void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
 518         struct sas_rphy *rphy)
 519 {
 520         int rc;
 521         struct pqi_ctrl_info *ctrl_info;
 522         struct bmic_csmi_smp_passthru_buffer *smp_buf;
 523         struct pqi_raid_error_info error_info;
 524         unsigned int reslen = 0;
 525
 526         ctrl_info = shost_to_hba(shost);
 527
 528         if (job->reply_payload.payload_len == 0) {
 529                 rc = -ENOMEM;
 530                 goto out;
 531         }
 532
 533         if (!rphy) {
 534                 rc = -EINVAL;
 535                 goto out;
 536         }
 537
 538         if (rphy->identify.device_type != SAS_FANOUT_EXPANDER_DEVICE) {
 539                 rc = -EINVAL;
 540                 goto out;
 541         }
 542
 543         if (job->request_payload.sg_cnt > 1 || job->reply_payload.sg_cnt > 1) {
 544                 rc = -EINVAL;
 545                 goto out;
 546         }
 547
 548         smp_buf = pqi_build_csmi_smp_passthru_buffer(rphy, job);
 549         if (!smp_buf) {
 550                 rc = -ENOMEM;
 551                 goto out;
 552         }
 553
 554         rc = pqi_csmi_smp_passthru(ctrl_info, smp_buf, sizeof(*smp_buf),
 555                 &error_info);
 556         if (rc)
 557                 goto out;
 558
 559         reslen = pqi_build_sas_smp_handler_reply(smp_buf, job, &error_info);
 560
 561 out:
 562         bsg_job_done(job, rc, reslen);
 563 }
 564 struct sas_function_template pqi_sas_transport_functions = {
 565         .get_linkerrors = pqi_sas_get_linkerrors,
 566         .get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
 567         .get_bay_identifier = pqi_sas_get_bay_identifier,
 568         .phy_reset = pqi_sas_phy_reset,
 569         .phy_enable = pqi_sas_phy_enable,
 570         .phy_setup = pqi_sas_phy_setup,
 571         .phy_release = pqi_sas_phy_release,
 572         .set_phy_speed = pqi_sas_phy_speed,
 573         .smp_handler = pqi_sas_smp_handler,
 574 };