drivers/misc/cxl/sysfs.c

   1 /*
   2  * Copyright 2014 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/device.h>
  12 #include <linux/sysfs.h>
  13 #include <linux/pci_regs.h>
  14
  15 #include "cxl.h"
  16
  17 #define to_afu_chardev_m(d) dev_get_drvdata(d)
  18
  19 /*********  Adapter attributes  **********************************************/
  20
  21 static ssize_t caia_version_show(struct device *device,
  22                                  struct device_attribute *attr,
  23                                  char *buf)
  24 {
  25         struct cxl *adapter = to_cxl_adapter(device);
  26
  27         return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
  28                          adapter->caia_minor);
  29 }
  30
  31 static ssize_t psl_revision_show(struct device *device,
  32                                  struct device_attribute *attr,
  33                                  char *buf)
  34 {
  35         struct cxl *adapter = to_cxl_adapter(device);
  36
  37         return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
  38 }
  39
  40 static ssize_t base_image_show(struct device *device,
  41                                struct device_attribute *attr,
  42                                char *buf)
  43 {
  44         struct cxl *adapter = to_cxl_adapter(device);
  45
  46         return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
  47 }
  48
  49 static ssize_t image_loaded_show(struct device *device,
  50                                  struct device_attribute *attr,
  51                                  char *buf)
  52 {
  53         struct cxl *adapter = to_cxl_adapter(device);
  54
  55         if (adapter->user_image_loaded)
  56                 return scnprintf(buf, PAGE_SIZE, "user\n");
  57         return scnprintf(buf, PAGE_SIZE, "factory\n");
  58 }
  59
  60 static ssize_t reset_adapter_store(struct device *device,
  61                                    struct device_attribute *attr,
  62                                    const char *buf, size_t count)
  63 {
  64         struct cxl *adapter = to_cxl_adapter(device);
  65         int rc;
  66         int val;
  67
  68         rc = sscanf(buf, "%i", &val);
  69         if ((rc != 1) || (val != 1))
  70                 return -EINVAL;
  71
  72         if ((rc = cxl_reset(adapter)))
  73                 return rc;
  74         return count;
  75 }
  76
  77 static ssize_t load_image_on_perst_show(struct device *device,
  78                                  struct device_attribute *attr,
  79                                  char *buf)
  80 {
  81         struct cxl *adapter = to_cxl_adapter(device);
  82
  83         if (!adapter->perst_loads_image)
  84                 return scnprintf(buf, PAGE_SIZE, "none\n");
  85
  86         if (adapter->perst_select_user)
  87                 return scnprintf(buf, PAGE_SIZE, "user\n");
  88         return scnprintf(buf, PAGE_SIZE, "factory\n");
  89 }
  90
  91 static ssize_t load_image_on_perst_store(struct device *device,
  92                                  struct device_attribute *attr,
  93                                  const char *buf, size_t count)
  94 {
  95         struct cxl *adapter = to_cxl_adapter(device);
  96         int rc;
  97
  98         if (!strncmp(buf, "none", 4))
  99                 adapter->perst_loads_image = false;
 100         else if (!strncmp(buf, "user", 4)) {
 101                 adapter->perst_select_user = true;
 102                 adapter->perst_loads_image = true;
 103         } else if (!strncmp(buf, "factory", 7)) {
 104                 adapter->perst_select_user = false;
 105                 adapter->perst_loads_image = true;
 106         } else
 107                 return -EINVAL;
 108
 109         if ((rc = cxl_update_image_control(adapter)))
 110                 return rc;
 111
 112         return count;
 113 }
 114
 115 static ssize_t perst_reloads_same_image_show(struct device *device,
 116                                  struct device_attribute *attr,
 117                                  char *buf)
 118 {
 119         struct cxl *adapter = to_cxl_adapter(device);
 120
 121         return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->perst_same_image);
 122 }
 123
 124 static ssize_t perst_reloads_same_image_store(struct device *device,
 125                                  struct device_attribute *attr,
 126                                  const char *buf, size_t count)
 127 {
 128         struct cxl *adapter = to_cxl_adapter(device);
 129         int rc;
 130         int val;
 131
 132         rc = sscanf(buf, "%i", &val);
 133         if ((rc != 1) || !(val == 1 || val == 0))
 134                 return -EINVAL;
 135
 136         adapter->perst_same_image = (val == 1 ? true : false);
 137         return count;
 138 }
 139
 140 static struct device_attribute adapter_attrs[] = {
 141         __ATTR_RO(caia_version),
 142         __ATTR_RO(psl_revision),
 143         __ATTR_RO(base_image),
 144         __ATTR_RO(image_loaded),
 145         __ATTR_RW(load_image_on_perst),
 146         __ATTR_RW(perst_reloads_same_image),
 147         __ATTR(reset, S_IWUSR, NULL, reset_adapter_store),
 148 };
 149
 150
 151 /*********  AFU master specific attributes  **********************************/
 152
 153 static ssize_t mmio_size_show_master(struct device *device,
 154                                      struct device_attribute *attr,
 155                                      char *buf)
 156 {
 157         struct cxl_afu *afu = to_afu_chardev_m(device);
 158
 159         return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
 160 }
 161
 162 static ssize_t pp_mmio_off_show(struct device *device,
 163                                 struct device_attribute *attr,
 164                                 char *buf)
 165 {
 166         struct cxl_afu *afu = to_afu_chardev_m(device);
 167
 168         return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_offset);
 169 }
 170
 171 static ssize_t pp_mmio_len_show(struct device *device,
 172                                 struct device_attribute *attr,
 173                                 char *buf)
 174 {
 175         struct cxl_afu *afu = to_afu_chardev_m(device);
 176
 177         return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
 178 }
 179
 180 static struct device_attribute afu_master_attrs[] = {
 181         __ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
 182         __ATTR_RO(pp_mmio_off),
 183         __ATTR_RO(pp_mmio_len),
 184 };
 185
 186
 187 /*********  AFU attributes  **************************************************/
 188
 189 static ssize_t mmio_size_show(struct device *device,
 190                               struct device_attribute *attr,
 191                               char *buf)
 192 {
 193         struct cxl_afu *afu = to_cxl_afu(device);
 194
 195         if (afu->pp_size)
 196                 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
 197         return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
 198 }
 199
 200 static ssize_t reset_store_afu(struct device *device,
 201                                struct device_attribute *attr,
 202                                const char *buf, size_t count)
 203 {
 204         struct cxl_afu *afu = to_cxl_afu(device);
 205         int rc;
 206
 207         /* Not safe to reset if it is currently in use */
 208         mutex_lock(&afu->contexts_lock);
 209         if (!idr_is_empty(&afu->contexts_idr)) {
 210                 rc = -EBUSY;
 211                 goto err;
 212         }
 213
 214         if ((rc = __cxl_afu_reset(afu)))
 215                 goto err;
 216
 217         rc = count;
 218 err:
 219         mutex_unlock(&afu->contexts_lock);
 220         return rc;
 221 }
 222
 223 static ssize_t irqs_min_show(struct device *device,
 224                              struct device_attribute *attr,
 225                              char *buf)
 226 {
 227         struct cxl_afu *afu = to_cxl_afu(device);
 228
 229         return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
 230 }
 231
 232 static ssize_t irqs_max_show(struct device *device,
 233                                   struct device_attribute *attr,
 234                                   char *buf)
 235 {
 236         struct cxl_afu *afu = to_cxl_afu(device);
 237
 238         return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
 239 }
 240
 241 static ssize_t irqs_max_store(struct device *device,
 242                                   struct device_attribute *attr,
 243                                   const char *buf, size_t count)
 244 {
 245         struct cxl_afu *afu = to_cxl_afu(device);
 246         ssize_t ret;
 247         int irqs_max;
 248
 249         ret = sscanf(buf, "%i", &irqs_max);
 250         if (ret != 1)
 251                 return -EINVAL;
 252
 253         if (irqs_max < afu->pp_irqs)
 254                 return -EINVAL;
 255
 256         if (irqs_max > afu->adapter->user_irqs)
 257                 return -EINVAL;
 258
 259         afu->irqs_max = irqs_max;
 260         return count;
 261 }
 262
 263 static ssize_t modes_supported_show(struct device *device,
 264                                     struct device_attribute *attr, char *buf)
 265 {
 266         struct cxl_afu *afu = to_cxl_afu(device);
 267         char *p = buf, *end = buf + PAGE_SIZE;
 268
 269         if (afu->modes_supported & CXL_MODE_DEDICATED)
 270                 p += scnprintf(p, end - p, "dedicated_process\n");
 271         if (afu->modes_supported & CXL_MODE_DIRECTED)
 272                 p += scnprintf(p, end - p, "afu_directed\n");
 273         return (p - buf);
 274 }
 275
 276 static ssize_t prefault_mode_show(struct device *device,
 277                                   struct device_attribute *attr,
 278                                   char *buf)
 279 {
 280         struct cxl_afu *afu = to_cxl_afu(device);
 281
 282         switch (afu->prefault_mode) {
 283         case CXL_PREFAULT_WED:
 284                 return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
 285         case CXL_PREFAULT_ALL:
 286                 return scnprintf(buf, PAGE_SIZE, "all\n");
 287         default:
 288                 return scnprintf(buf, PAGE_SIZE, "none\n");
 289         }
 290 }
 291
 292 static ssize_t prefault_mode_store(struct device *device,
 293                           struct device_attribute *attr,
 294                           const char *buf, size_t count)
 295 {
 296         struct cxl_afu *afu = to_cxl_afu(device);
 297         enum prefault_modes mode = -1;
 298
 299         if (!strncmp(buf, "work_element_descriptor", 23))
 300                 mode = CXL_PREFAULT_WED;
 301         if (!strncmp(buf, "all", 3))
 302                 mode = CXL_PREFAULT_ALL;
 303         if (!strncmp(buf, "none", 4))
 304                 mode = CXL_PREFAULT_NONE;
 305
 306         if (mode == -1)
 307                 return -EINVAL;
 308
 309         afu->prefault_mode = mode;
 310         return count;
 311 }
 312
 313 static ssize_t mode_show(struct device *device,
 314                          struct device_attribute *attr,
 315                          char *buf)
 316 {
 317         struct cxl_afu *afu = to_cxl_afu(device);
 318
 319         if (afu->current_mode == CXL_MODE_DEDICATED)
 320                 return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
 321         if (afu->current_mode == CXL_MODE_DIRECTED)
 322                 return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
 323         return scnprintf(buf, PAGE_SIZE, "none\n");
 324 }
 325
 326 static ssize_t mode_store(struct device *device, struct device_attribute *attr,
 327                           const char *buf, size_t count)
 328 {
 329         struct cxl_afu *afu = to_cxl_afu(device);
 330         int old_mode, mode = -1;
 331         int rc = -EBUSY;
 332
 333         /* can't change this if we have a user */
 334         mutex_lock(&afu->contexts_lock);
 335         if (!idr_is_empty(&afu->contexts_idr))
 336                 goto err;
 337
 338         if (!strncmp(buf, "dedicated_process", 17))
 339                 mode = CXL_MODE_DEDICATED;
 340         if (!strncmp(buf, "afu_directed", 12))
 341                 mode = CXL_MODE_DIRECTED;
 342         if (!strncmp(buf, "none", 4))
 343                 mode = 0;
 344
 345         if (mode == -1) {
 346                 rc = -EINVAL;
 347                 goto err;
 348         }
 349
 350         /*
 351          * cxl_afu_deactivate_mode needs to be done outside the lock, prevent
 352          * other contexts coming in before we are ready:
 353          */
 354         old_mode = afu->current_mode;
 355         afu->current_mode = 0;
 356         afu->num_procs = 0;
 357
 358         mutex_unlock(&afu->contexts_lock);
 359
 360         if ((rc = _cxl_afu_deactivate_mode(afu, old_mode)))
 361                 return rc;
 362         if ((rc = cxl_afu_activate_mode(afu, mode)))
 363                 return rc;
 364
 365         return count;
 366 err:
 367         mutex_unlock(&afu->contexts_lock);
 368         return rc;
 369 }
 370
 371 static ssize_t api_version_show(struct device *device,
 372                                 struct device_attribute *attr,
 373                                 char *buf)
 374 {
 375         return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
 376 }
 377
 378 static ssize_t api_version_compatible_show(struct device *device,
 379                                            struct device_attribute *attr,
 380                                            char *buf)
 381 {
 382         return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
 383 }
 384
 385 static ssize_t afu_eb_read(struct file *filp, struct kobject *kobj,
 386                                struct bin_attribute *bin_attr, char *buf,
 387                                loff_t off, size_t count)
 388 {
 389         struct cxl_afu *afu = to_cxl_afu(container_of(kobj,
 390                                                       struct device, kobj));
 391
 392         return cxl_afu_read_err_buffer(afu, buf, off, count);
 393 }
 394
 395 static struct device_attribute afu_attrs[] = {
 396         __ATTR_RO(mmio_size),
 397         __ATTR_RO(irqs_min),
 398         __ATTR_RW(irqs_max),
 399         __ATTR_RO(modes_supported),
 400         __ATTR_RW(mode),
 401         __ATTR_RW(prefault_mode),
 402         __ATTR_RO(api_version),
 403         __ATTR_RO(api_version_compatible),
 404         __ATTR(reset, S_IWUSR, NULL, reset_store_afu),
 405 };
 406
 407 int cxl_sysfs_adapter_add(struct cxl *adapter)
 408 {
 409         int i, rc;
 410
 411         for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
 412                 if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
 413                         goto err;
 414         }
 415         return 0;
 416 err:
 417         for (i--; i >= 0; i--)
 418                 device_remove_file(&adapter->dev, &adapter_attrs[i]);
 419         return rc;
 420 }
 421 void cxl_sysfs_adapter_remove(struct cxl *adapter)
 422 {
 423         int i;
 424
 425         for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
 426                 device_remove_file(&adapter->dev, &adapter_attrs[i]);
 427 }
 428
 429 struct afu_config_record {
 430         struct kobject kobj;
 431         struct bin_attribute config_attr;
 432         struct list_head list;
 433         int cr;
 434         u16 device;
 435         u16 vendor;
 436         u32 class;
 437 };
 438
 439 #define to_cr(obj) container_of(obj, struct afu_config_record, kobj)
 440
 441 static ssize_t vendor_show(struct kobject *kobj,
 442                            struct kobj_attribute *attr, char *buf)
 443 {
 444         struct afu_config_record *cr = to_cr(kobj);
 445
 446         return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->vendor);
 447 }
 448
 449 static ssize_t device_show(struct kobject *kobj,
 450                            struct kobj_attribute *attr, char *buf)
 451 {
 452         struct afu_config_record *cr = to_cr(kobj);
 453
 454         return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->device);
 455 }
 456
 457 static ssize_t class_show(struct kobject *kobj,
 458                           struct kobj_attribute *attr, char *buf)
 459 {
 460         struct afu_config_record *cr = to_cr(kobj);
 461
 462         return scnprintf(buf, PAGE_SIZE, "0x%.6x\n", cr->class);
 463 }
 464
 465 static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
 466                                struct bin_attribute *bin_attr, char *buf,
 467                                loff_t off, size_t count)
 468 {
 469         struct afu_config_record *cr = to_cr(kobj);
 470         struct cxl_afu *afu = to_cxl_afu(container_of(kobj->parent, struct device, kobj));
 471
 472         u64 i, j, val;
 473
 474         for (i = 0; i < count;) {
 475                 val = cxl_afu_cr_read64(afu, cr->cr, off & ~0x7);
 476                 for (j = off & 0x7; j < 8 && i < count; i++, j++, off++)
 477                         buf[i] = (val >> (j * 8)) & 0xff;
 478         }
 479
 480         return count;
 481 }
 482
 483 static struct kobj_attribute vendor_attribute =
 484         __ATTR_RO(vendor);
 485 static struct kobj_attribute device_attribute =
 486         __ATTR_RO(device);
 487 static struct kobj_attribute class_attribute =
 488         __ATTR_RO(class);
 489
 490 static struct attribute *afu_cr_attrs[] = {
 491         &vendor_attribute.attr,
 492         &device_attribute.attr,
 493         &class_attribute.attr,
 494         NULL,
 495 };
 496
 497 static void release_afu_config_record(struct kobject *kobj)
 498 {
 499         struct afu_config_record *cr = to_cr(kobj);
 500
 501         kfree(cr);
 502 }
 503
 504 static struct kobj_type afu_config_record_type = {
 505         .sysfs_ops = &kobj_sysfs_ops,
 506         .release = release_afu_config_record,
 507         .default_attrs = afu_cr_attrs,
 508 };
 509
 510 static struct afu_config_record *cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int cr_idx)
 511 {
 512         struct afu_config_record *cr;
 513         int rc;
 514
 515         cr = kzalloc(sizeof(struct afu_config_record), GFP_KERNEL);
 516         if (!cr)
 517                 return ERR_PTR(-ENOMEM);
 518
 519         cr->cr = cr_idx;
 520         cr->device = cxl_afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID);
 521         cr->vendor = cxl_afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID);
 522         cr->class = cxl_afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION) >> 8;
 523
 524         /*
 525          * Export raw AFU PCIe like config record. For now this is read only by
 526          * root - we can expand that later to be readable by non-root and maybe
 527          * even writable provided we have a good use-case. Once we suport
 528          * exposing AFUs through a virtual PHB they will get that for free from
 529          * Linux' PCI infrastructure, but until then it's not clear that we
 530          * need it for anything since the main use case is just identifying
 531          * AFUs, which can be done via the vendor, device and class attributes.
 532          */
 533         sysfs_bin_attr_init(&cr->config_attr);
 534         cr->config_attr.attr.name = "config";
 535         cr->config_attr.attr.mode = S_IRUSR;
 536         cr->config_attr.size = afu->crs_len;
 537         cr->config_attr.read = afu_read_config;
 538
 539         rc = kobject_init_and_add(&cr->kobj, &afu_config_record_type,
 540                                   &afu->dev.kobj, "cr%i", cr->cr);
 541         if (rc)
 542                 goto err;
 543
 544         rc = sysfs_create_bin_file(&cr->kobj, &cr->config_attr);
 545         if (rc)
 546                 goto err1;
 547
 548         rc = kobject_uevent(&cr->kobj, KOBJ_ADD);
 549         if (rc)
 550                 goto err2;
 551
 552         return cr;
 553 err2:
 554         sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
 555 err1:
 556         kobject_put(&cr->kobj);
 557         return ERR_PTR(rc);
 558 err:
 559         kfree(cr);
 560         return ERR_PTR(rc);
 561 }
 562
 563 void cxl_sysfs_afu_remove(struct cxl_afu *afu)
 564 {
 565         struct afu_config_record *cr, *tmp;
 566         int i;
 567
 568         /* remove the err buffer bin attribute */
 569         if (afu->eb_len)
 570                 device_remove_bin_file(&afu->dev, &afu->attr_eb);
 571
 572         for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
 573                 device_remove_file(&afu->dev, &afu_attrs[i]);
 574
 575         list_for_each_entry_safe(cr, tmp, &afu->crs, list) {
 576                 sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
 577                 kobject_put(&cr->kobj);
 578         }
 579 }
 580
 581 int cxl_sysfs_afu_add(struct cxl_afu *afu)
 582 {
 583         struct afu_config_record *cr;
 584         int i, rc;
 585
 586         INIT_LIST_HEAD(&afu->crs);
 587
 588         for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
 589                 if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
 590                         goto err;
 591         }
 592
 593         /* conditionally create the add the binary file for error info buffer */
 594         if (afu->eb_len) {
 595                 afu->attr_eb.attr.name = "afu_err_buff";
 596                 afu->attr_eb.attr.mode = S_IRUGO;
 597                 afu->attr_eb.size = afu->eb_len;
 598                 afu->attr_eb.read = afu_eb_read;
 599
 600                 rc = device_create_bin_file(&afu->dev, &afu->attr_eb);
 601                 if (rc) {
 602                         dev_err(&afu->dev,
 603                                 "Unable to create eb attr for the afu. Err(%d)\n",
 604                                 rc);
 605                         goto err;
 606                 }
 607         }
 608
 609         for (i = 0; i < afu->crs_num; i++) {
 610                 cr = cxl_sysfs_afu_new_cr(afu, i);
 611                 if (IS_ERR(cr)) {
 612                         rc = PTR_ERR(cr);
 613                         goto err1;
 614                 }
 615                 list_add(&cr->list, &afu->crs);
 616         }
 617
 618         return 0;
 619
 620 err1:
 621         cxl_sysfs_afu_remove(afu);
 622         return rc;
 623 err:
 624         /* reset the eb_len as we havent created the bin attr */
 625         afu->eb_len = 0;
 626
 627         for (i--; i >= 0; i--)
 628                 device_remove_file(&afu->dev, &afu_attrs[i]);
 629         return rc;
 630 }
 631
 632 int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
 633 {
 634         int i, rc;
 635
 636         for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
 637                 if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
 638                         goto err;
 639         }
 640
 641         return 0;
 642
 643 err:
 644         for (i--; i >= 0; i--)
 645                 device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
 646         return rc;
 647 }
 648
 649 void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
 650 {
 651         int i;
 652
 653         for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++)
 654                 device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
 655 }