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 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         sas_phy_free(phy);
  49         if (pqi_sas_phy->added_to_port)
  50                 list_del(&pqi_sas_phy->phy_list_entry);
  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_STP;
  69         identify->target_port_protocols = SAS_PROTOCOL_STP;
  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         if (pqi_sas_port->device &&
  97                 pqi_sas_port->device->is_expander_smp_device) {
  98                 identify->initiator_port_protocols = SAS_PROTOCOL_SMP;
  99                 identify->target_port_protocols = SAS_PROTOCOL_SMP;
 100         } else {
 101                 identify->initiator_port_protocols = SAS_PROTOCOL_STP;
 102                 identify->target_port_protocols = SAS_PROTOCOL_STP;
 103         }
 104
 105         return sas_rphy_add(rphy);
 106 }
 107
 108 static struct sas_rphy *pqi_sas_rphy_alloc(struct pqi_sas_port *pqi_sas_port)
 109 {
 110         if (pqi_sas_port->device &&
 111                 pqi_sas_port->device->is_expander_smp_device)
 112                 return sas_expander_alloc(pqi_sas_port->port,
 113                                 SAS_FANOUT_EXPANDER_DEVICE);
 114
 115         return sas_end_device_alloc(pqi_sas_port->port);
 116 }
 117
 118 static struct pqi_sas_port *pqi_alloc_sas_port(
 119         struct pqi_sas_node *pqi_sas_node, u64 sas_address,
 120         struct pqi_scsi_dev *device)
 121 {
 122         int rc;
 123         struct pqi_sas_port *pqi_sas_port;
 124         struct sas_port *port;
 125
 126         pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
 127         if (!pqi_sas_port)
 128                 return NULL;
 129
 130         INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
 131         pqi_sas_port->parent_node = pqi_sas_node;
 132
 133         port = sas_port_alloc_num(pqi_sas_node->parent_dev);
 134         if (!port)
 135                 goto free_pqi_port;
 136
 137         rc = sas_port_add(port);
 138         if (rc)
 139                 goto free_sas_port;
 140
 141         pqi_sas_port->port = port;
 142         pqi_sas_port->sas_address = sas_address;
 143         pqi_sas_port->device = device;
 144         list_add_tail(&pqi_sas_port->port_list_entry,
 145                 &pqi_sas_node->port_list_head);
 146
 147         return pqi_sas_port;
 148
 149 free_sas_port:
 150         sas_port_free(port);
 151 free_pqi_port:
 152         kfree(pqi_sas_port);
 153
 154         return NULL;
 155 }
 156
 157 static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
 158 {
 159         struct pqi_sas_phy *pqi_sas_phy;
 160         struct pqi_sas_phy *next;
 161
 162         list_for_each_entry_safe(pqi_sas_phy, next,
 163                 &pqi_sas_port->phy_list_head, phy_list_entry)
 164                 pqi_free_sas_phy(pqi_sas_phy);
 165
 166         sas_port_delete(pqi_sas_port->port);
 167         list_del(&pqi_sas_port->port_list_entry);
 168         kfree(pqi_sas_port);
 169 }
 170
 171 static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
 172 {
 173         struct pqi_sas_node *pqi_sas_node;
 174
 175         pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
 176         if (pqi_sas_node) {
 177                 pqi_sas_node->parent_dev = parent_dev;
 178                 INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
 179         }
 180
 181         return pqi_sas_node;
 182 }
 183
 184 static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
 185 {
 186         struct pqi_sas_port *pqi_sas_port;
 187         struct pqi_sas_port *next;
 188
 189         if (!pqi_sas_node)
 190                 return;
 191
 192         list_for_each_entry_safe(pqi_sas_port, next,
 193                 &pqi_sas_node->port_list_head, port_list_entry)
 194                 pqi_free_sas_port(pqi_sas_port);
 195
 196         kfree(pqi_sas_node);
 197 }
 198
 199 struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
 200         struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
 201 {
 202         struct pqi_scsi_dev *device;
 203
 204         list_for_each_entry(device, &ctrl_info->scsi_device_list,
 205                 scsi_device_list_entry) {
 206                 if (!device->sas_port)
 207                         continue;
 208                 if (device->sas_port->rphy == rphy)
 209                         return device;
 210         }
 211
 212         return NULL;
 213 }
 214
 215 int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
 216 {
 217         int rc;
 218         struct device *parent_dev;
 219         struct pqi_sas_node *pqi_sas_node;
 220         struct pqi_sas_port *pqi_sas_port;
 221         struct pqi_sas_phy *pqi_sas_phy;
 222
 223         parent_dev = &shost->shost_dev;
 224
 225         pqi_sas_node = pqi_alloc_sas_node(parent_dev);
 226         if (!pqi_sas_node)
 227                 return -ENOMEM;
 228
 229         pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
 230                 ctrl_info->sas_address, NULL);
 231         if (!pqi_sas_port) {
 232                 rc = -ENODEV;
 233                 goto free_sas_node;
 234         }
 235
 236         pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
 237         if (!pqi_sas_phy) {
 238                 rc = -ENODEV;
 239                 goto free_sas_port;
 240         }
 241
 242         rc = pqi_sas_port_add_phy(pqi_sas_phy);
 243         if (rc)
 244                 goto free_sas_phy;
 245
 246         ctrl_info->sas_host = pqi_sas_node;
 247
 248         return 0;
 249
 250 free_sas_phy:
 251         pqi_free_sas_phy(pqi_sas_phy);
 252 free_sas_port:
 253         pqi_free_sas_port(pqi_sas_port);
 254 free_sas_node:
 255         pqi_free_sas_node(pqi_sas_node);
 256
 257         return rc;
 258 }
 259
 260 void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
 261 {
 262         pqi_free_sas_node(ctrl_info->sas_host);
 263 }
 264
 265 int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
 266         struct pqi_scsi_dev *device)
 267 {
 268         int rc;
 269         struct pqi_sas_port *pqi_sas_port;
 270         struct sas_rphy *rphy;
 271
 272         pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
 273                 device->sas_address, device);
 274         if (!pqi_sas_port)
 275                 return -ENOMEM;
 276
 277         rphy = pqi_sas_rphy_alloc(pqi_sas_port);
 278         if (!rphy) {
 279                 rc = -ENODEV;
 280                 goto free_sas_port;
 281         }
 282
 283         pqi_sas_port->rphy = rphy;
 284         device->sas_port = pqi_sas_port;
 285
 286         rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
 287         if (rc)
 288                 goto free_sas_port;
 289
 290         return 0;
 291
 292 free_sas_port:
 293         pqi_free_sas_port(pqi_sas_port);
 294         device->sas_port = NULL;
 295
 296         return rc;
 297 }
 298
 299 void pqi_remove_sas_device(struct pqi_scsi_dev *device)
 300 {
 301         if (device->sas_port) {
 302                 pqi_free_sas_port(device->sas_port);
 303                 device->sas_port = NULL;
 304         }
 305 }
 306
 307 static int pqi_sas_get_linkerrors(struct sas_phy *phy)
 308 {
 309         return 0;
 310 }
 311
 312 static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
 313         u64 *identifier)
 314 {
 315         return 0;
 316 }
 317
 318 static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
 319 {
 320         return -ENXIO;
 321 }
 322
 323 static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
 324 {
 325         return 0;
 326 }
 327
 328 static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
 329 {
 330         return 0;
 331 }
 332
 333 static int pqi_sas_phy_setup(struct sas_phy *phy)
 334 {
 335         return 0;
 336 }
 337
 338 static void pqi_sas_phy_release(struct sas_phy *phy)
 339 {
 340 }
 341
 342 static int pqi_sas_phy_speed(struct sas_phy *phy,
 343         struct sas_phy_linkrates *rates)
 344 {
 345         return -EINVAL;
 346 }
 347
 348 #define CSMI_IOCTL_TIMEOUT      60
 349 #define SMP_CRC_FIELD_LENGTH    4
 350
 351 static struct bmic_csmi_smp_passthru_buffer *
 352 pqi_build_csmi_smp_passthru_buffer(struct sas_rphy *rphy,
 353         struct bsg_job *job)
 354 {
 355         struct bmic_csmi_smp_passthru_buffer *smp_buf;
 356         struct bmic_csmi_ioctl_header *ioctl_header;
 357         struct bmic_csmi_smp_passthru *parameters;
 358         u32 req_size;
 359         u32 resp_size;
 360
 361         smp_buf = kzalloc(sizeof(*smp_buf), GFP_KERNEL);
 362         if (!smp_buf)
 363                 return NULL;
 364
 365         req_size = job->request_payload.payload_len;
 366         resp_size = job->reply_payload.payload_len;
 367
 368         ioctl_header = &smp_buf->ioctl_header;
 369         put_unaligned_le32(sizeof(smp_buf->ioctl_header),
 370                 &ioctl_header->header_length);
 371         put_unaligned_le32(CSMI_IOCTL_TIMEOUT, &ioctl_header->timeout);
 372         put_unaligned_le32(CSMI_CC_SAS_SMP_PASSTHRU,
 373                 &ioctl_header->control_code);
 374         put_unaligned_le32(sizeof(smp_buf->parameters), &ioctl_header->length);
 375
 376         parameters = &smp_buf->parameters;
 377         parameters->phy_identifier = rphy->identify.phy_identifier;
 378         parameters->port_identifier = 0;
 379         parameters->connection_rate = 0;
 380         put_unaligned_be64(rphy->identify.sas_address,
 381                 &parameters->destination_sas_address);
 382
 383         if (req_size > SMP_CRC_FIELD_LENGTH)
 384                 req_size -= SMP_CRC_FIELD_LENGTH;
 385
 386         put_unaligned_le32(req_size, &parameters->request_length);
 387
 388         put_unaligned_le32(resp_size, &parameters->response_length);
 389
 390         sg_copy_to_buffer(job->request_payload.sg_list,
 391                 job->reply_payload.sg_cnt, &parameters->request,
 392                 req_size);
 393
 394         return smp_buf;
 395 }
 396
 397 static unsigned int pqi_build_sas_smp_handler_reply(
 398         struct bmic_csmi_smp_passthru_buffer *smp_buf, struct bsg_job *job,
 399         struct pqi_raid_error_info *error_info)
 400 {
 401         sg_copy_from_buffer(job->reply_payload.sg_list,
 402                 job->reply_payload.sg_cnt, &smp_buf->parameters.response,
 403                 le32_to_cpu(smp_buf->parameters.response_length));
 404
 405         job->reply_len = le16_to_cpu(error_info->sense_data_length);
 406         memcpy(job->reply, error_info->data,
 407                         le16_to_cpu(error_info->sense_data_length));
 408
 409         return job->reply_payload.payload_len -
 410                 get_unaligned_le32(&error_info->data_in_transferred);
 411 }
 412
 413 void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
 414         struct sas_rphy *rphy)
 415 {
 416         int rc;
 417         struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
 418         struct bmic_csmi_smp_passthru_buffer *smp_buf;
 419         struct pqi_raid_error_info error_info;
 420         unsigned int reslen = 0;
 421
 422         pqi_ctrl_busy(ctrl_info);
 423
 424         if (job->reply_payload.payload_len == 0) {
 425                 rc = -ENOMEM;
 426                 goto out;
 427         }
 428
 429         if (!rphy) {
 430                 rc = -EINVAL;
 431                 goto out;
 432         }
 433
 434         if (rphy->identify.device_type != SAS_FANOUT_EXPANDER_DEVICE) {
 435                 rc = -EINVAL;
 436                 goto out;
 437         }
 438
 439         if (job->request_payload.sg_cnt > 1 || job->reply_payload.sg_cnt > 1) {
 440                 rc = -EINVAL;
 441                 goto out;
 442         }
 443
 444         if (pqi_ctrl_offline(ctrl_info)) {
 445                 rc = -ENXIO;
 446                 goto out;
 447         }
 448
 449         if (pqi_ctrl_blocked(ctrl_info)) {
 450                 rc = -EBUSY;
 451                 goto out;
 452         }
 453
 454         smp_buf = pqi_build_csmi_smp_passthru_buffer(rphy, job);
 455         if (!smp_buf) {
 456                 rc = -ENOMEM;
 457                 goto out;
 458         }
 459
 460         rc = pqi_csmi_smp_passthru(ctrl_info, smp_buf, sizeof(*smp_buf),
 461                 &error_info);
 462         if (rc)
 463                 goto out;
 464
 465         reslen = pqi_build_sas_smp_handler_reply(smp_buf, job, &error_info);
 466 out:
 467         bsg_job_done(job, rc, reslen);
 468         pqi_ctrl_unbusy(ctrl_info);
 469 }
 470 struct sas_function_template pqi_sas_transport_functions = {
 471         .get_linkerrors = pqi_sas_get_linkerrors,
 472         .get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
 473         .get_bay_identifier = pqi_sas_get_bay_identifier,
 474         .phy_reset = pqi_sas_phy_reset,
 475         .phy_enable = pqi_sas_phy_enable,
 476         .phy_setup = pqi_sas_phy_setup,
 477         .phy_release = pqi_sas_phy_release,
 478         .set_phy_speed = pqi_sas_phy_speed,
 479         .smp_handler = pqi_sas_smp_handler,
 480 };