drivers/misc/ocxl/config.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 // Copyright 2017 IBM Corp.
   3 #include <linux/pci.h>
   4 #include <asm/pnv-ocxl.h>
   5 #include <misc/ocxl.h>
   6 #include <misc/ocxl-config.h>
   7
   8 #define EXTRACT_BIT(val, bit) (!!(val & BIT(bit)))
   9 #define EXTRACT_BITS(val, s, e) ((val & GENMASK(e, s)) >> s)
  10
  11 #define OCXL_DVSEC_AFU_IDX_MASK              GENMASK(5, 0)
  12 #define OCXL_DVSEC_ACTAG_MASK                GENMASK(11, 0)
  13 #define OCXL_DVSEC_PASID_MASK                GENMASK(19, 0)
  14 #define OCXL_DVSEC_PASID_LOG_MASK            GENMASK(4, 0)
  15
  16 #define OCXL_DVSEC_TEMPL_VERSION         0x0
  17 #define OCXL_DVSEC_TEMPL_NAME            0x4
  18 #define OCXL_DVSEC_TEMPL_AFU_VERSION     0x1C
  19 #define OCXL_DVSEC_TEMPL_MMIO_GLOBAL     0x20
  20 #define OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ  0x28
  21 #define OCXL_DVSEC_TEMPL_MMIO_PP         0x30
  22 #define OCXL_DVSEC_TEMPL_MMIO_PP_SZ      0x38
  23 #define OCXL_DVSEC_TEMPL_MEM_SZ          0x3C
  24 #define OCXL_DVSEC_TEMPL_WWID            0x40
  25
  26 #define OCXL_MAX_AFU_PER_FUNCTION 64
  27 #define OCXL_TEMPL_LEN            0x58
  28 #define OCXL_TEMPL_NAME_LEN       24
  29 #define OCXL_CFG_TIMEOUT     3
  30
  31 static int find_dvsec(struct pci_dev *dev, int dvsec_id)
  32 {
  33         int vsec = 0;
  34         u16 vendor, id;
  35
  36         while ((vsec = pci_find_next_ext_capability(dev, vsec,
  37                                                     OCXL_EXT_CAP_ID_DVSEC))) {
  38                 pci_read_config_word(dev, vsec + OCXL_DVSEC_VENDOR_OFFSET,
  39                                 &vendor);
  40                 pci_read_config_word(dev, vsec + OCXL_DVSEC_ID_OFFSET, &id);
  41                 if (vendor == PCI_VENDOR_ID_IBM && id == dvsec_id)
  42                         return vsec;
  43         }
  44         return 0;
  45 }
  46
  47 static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx)
  48 {
  49         int vsec = 0;
  50         u16 vendor, id;
  51         u8 idx;
  52
  53         while ((vsec = pci_find_next_ext_capability(dev, vsec,
  54                                                     OCXL_EXT_CAP_ID_DVSEC))) {
  55                 pci_read_config_word(dev, vsec + OCXL_DVSEC_VENDOR_OFFSET,
  56                                 &vendor);
  57                 pci_read_config_word(dev, vsec + OCXL_DVSEC_ID_OFFSET, &id);
  58
  59                 if (vendor == PCI_VENDOR_ID_IBM &&
  60                         id == OCXL_DVSEC_AFU_CTRL_ID) {
  61                         pci_read_config_byte(dev,
  62                                         vsec + OCXL_DVSEC_AFU_CTRL_AFU_IDX,
  63                                         &idx);
  64                         if (idx == afu_idx)
  65                                 return vsec;
  66                 }
  67         }
  68         return 0;
  69 }
  70
  71 static int read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn)
  72 {
  73         u16 val;
  74         int pos;
  75
  76         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PASID);
  77         if (!pos) {
  78                 /*
  79                  * PASID capability is not mandatory, but there
  80                  * shouldn't be any AFU
  81                  */
  82                 dev_dbg(&dev->dev, "Function doesn't require any PASID\n");
  83                 fn->max_pasid_log = -1;
  84                 goto out;
  85         }
  86         pci_read_config_word(dev, pos + PCI_PASID_CAP, &val);
  87         fn->max_pasid_log = EXTRACT_BITS(val, 8, 12);
  88
  89 out:
  90         dev_dbg(&dev->dev, "PASID capability:\n");
  91         dev_dbg(&dev->dev, "  Max PASID log = %d\n", fn->max_pasid_log);
  92         return 0;
  93 }
  94
  95 static int read_dvsec_tl(struct pci_dev *dev, struct ocxl_fn_config *fn)
  96 {
  97         int pos;
  98
  99         pos = find_dvsec(dev, OCXL_DVSEC_TL_ID);
 100         if (!pos && PCI_FUNC(dev->devfn) == 0) {
 101                 dev_err(&dev->dev, "Can't find TL DVSEC\n");
 102                 return -ENODEV;
 103         }
 104         if (pos && PCI_FUNC(dev->devfn) != 0) {
 105                 dev_err(&dev->dev, "TL DVSEC is only allowed on function 0\n");
 106                 return -ENODEV;
 107         }
 108         fn->dvsec_tl_pos = pos;
 109         return 0;
 110 }
 111
 112 static int read_dvsec_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
 113 {
 114         int pos, afu_present;
 115         u32 val;
 116
 117         pos = find_dvsec(dev, OCXL_DVSEC_FUNC_ID);
 118         if (!pos) {
 119                 dev_err(&dev->dev, "Can't find function DVSEC\n");
 120                 return -ENODEV;
 121         }
 122         fn->dvsec_function_pos = pos;
 123
 124         pci_read_config_dword(dev, pos + OCXL_DVSEC_FUNC_OFF_INDEX, &val);
 125         afu_present = EXTRACT_BIT(val, 31);
 126         if (!afu_present) {
 127                 fn->max_afu_index = -1;
 128                 dev_dbg(&dev->dev, "Function doesn't define any AFU\n");
 129                 goto out;
 130         }
 131         fn->max_afu_index = EXTRACT_BITS(val, 24, 29);
 132
 133 out:
 134         dev_dbg(&dev->dev, "Function DVSEC:\n");
 135         dev_dbg(&dev->dev, "  Max AFU index = %d\n", fn->max_afu_index);
 136         return 0;
 137 }
 138
 139 static int read_dvsec_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn)
 140 {
 141         int pos;
 142
 143         if (fn->max_afu_index < 0) {
 144                 fn->dvsec_afu_info_pos = -1;
 145                 return 0;
 146         }
 147
 148         pos = find_dvsec(dev, OCXL_DVSEC_AFU_INFO_ID);
 149         if (!pos) {
 150                 dev_err(&dev->dev, "Can't find AFU information DVSEC\n");
 151                 return -ENODEV;
 152         }
 153         fn->dvsec_afu_info_pos = pos;
 154         return 0;
 155 }
 156
 157 static int read_dvsec_vendor(struct pci_dev *dev)
 158 {
 159         int pos;
 160         u32 cfg, tlx, dlx;
 161
 162         /*
 163          * vendor specific DVSEC is optional
 164          *
 165          * It's currently only used on function 0 to specify the
 166          * version of some logic blocks. Some older images may not
 167          * even have it so we ignore any errors
 168          */
 169         if (PCI_FUNC(dev->devfn) != 0)
 170                 return 0;
 171
 172         pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
 173         if (!pos)
 174                 return 0;
 175
 176         pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_CFG_VERS, &cfg);
 177         pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_TLX_VERS, &tlx);
 178         pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_DLX_VERS, &dlx);
 179
 180         dev_dbg(&dev->dev, "Vendor specific DVSEC:\n");
 181         dev_dbg(&dev->dev, "  CFG version = 0x%x\n", cfg);
 182         dev_dbg(&dev->dev, "  TLX version = 0x%x\n", tlx);
 183         dev_dbg(&dev->dev, "  DLX version = 0x%x\n", dlx);
 184         return 0;
 185 }
 186
 187 static int validate_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
 188 {
 189         if (fn->max_pasid_log == -1 && fn->max_afu_index >= 0) {
 190                 dev_err(&dev->dev,
 191                         "AFUs are defined but no PASIDs are requested\n");
 192                 return -EINVAL;
 193         }
 194
 195         if (fn->max_afu_index > OCXL_MAX_AFU_PER_FUNCTION) {
 196                 dev_err(&dev->dev,
 197                         "Max AFU index out of architectural limit (%d vs %d)\n",
 198                         fn->max_afu_index, OCXL_MAX_AFU_PER_FUNCTION);
 199                 return -EINVAL;
 200         }
 201         return 0;
 202 }
 203
 204 int ocxl_config_read_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
 205 {
 206         int rc;
 207
 208         rc = read_pasid(dev, fn);
 209         if (rc) {
 210                 dev_err(&dev->dev, "Invalid PASID configuration: %d\n", rc);
 211                 return -ENODEV;
 212         }
 213
 214         rc = read_dvsec_tl(dev, fn);
 215         if (rc) {
 216                 dev_err(&dev->dev,
 217                         "Invalid Transaction Layer DVSEC configuration: %d\n",
 218                         rc);
 219                 return -ENODEV;
 220         }
 221
 222         rc = read_dvsec_function(dev, fn);
 223         if (rc) {
 224                 dev_err(&dev->dev,
 225                         "Invalid Function DVSEC configuration: %d\n", rc);
 226                 return -ENODEV;
 227         }
 228
 229         rc = read_dvsec_afu_info(dev, fn);
 230         if (rc) {
 231                 dev_err(&dev->dev, "Invalid AFU configuration: %d\n", rc);
 232                 return -ENODEV;
 233         }
 234
 235         rc = read_dvsec_vendor(dev);
 236         if (rc) {
 237                 dev_err(&dev->dev,
 238                         "Invalid vendor specific DVSEC configuration: %d\n",
 239                         rc);
 240                 return -ENODEV;
 241         }
 242
 243         rc = validate_function(dev, fn);
 244         return rc;
 245 }
 246 EXPORT_SYMBOL_GPL(ocxl_config_read_function);
 247
 248 static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn,
 249                         int offset, u32 *data)
 250 {
 251         u32 val;
 252         unsigned long timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
 253         int pos = fn->dvsec_afu_info_pos;
 254
 255         /* Protect 'data valid' bit */
 256         if (EXTRACT_BIT(offset, 31)) {
 257                 dev_err(&dev->dev, "Invalid offset in AFU info DVSEC\n");
 258                 return -EINVAL;
 259         }
 260
 261         pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, offset);
 262         pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
 263         while (!EXTRACT_BIT(val, 31)) {
 264                 if (time_after_eq(jiffies, timeout)) {
 265                         dev_err(&dev->dev,
 266                                 "Timeout while reading AFU info DVSEC (offset=%d)\n",
 267                                 offset);
 268                         return -EBUSY;
 269                 }
 270                 cpu_relax();
 271                 pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
 272         }
 273         pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_DATA, data);
 274         return 0;
 275 }
 276
 277 int ocxl_config_check_afu_index(struct pci_dev *dev,
 278                                 struct ocxl_fn_config *fn, int afu_idx)
 279 {
 280         u32 val;
 281         int rc, templ_major, templ_minor, len;
 282
 283         pci_write_config_word(dev, fn->dvsec_afu_info_pos, afu_idx);
 284         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val);
 285         if (rc)
 286                 return rc;
 287
 288         /* AFU index map can have holes */
 289         if (!val)
 290                 return 0;
 291
 292         templ_major = EXTRACT_BITS(val, 8, 15);
 293         templ_minor = EXTRACT_BITS(val, 0, 7);
 294         dev_dbg(&dev->dev, "AFU descriptor template version %d.%d\n",
 295                 templ_major, templ_minor);
 296
 297         len = EXTRACT_BITS(val, 16, 31);
 298         if (len != OCXL_TEMPL_LEN) {
 299                 dev_warn(&dev->dev,
 300                         "Unexpected template length in AFU information (%#x)\n",
 301                         len);
 302         }
 303         return 1;
 304 }
 305 EXPORT_SYMBOL_GPL(ocxl_config_check_afu_index);
 306
 307 static int read_afu_name(struct pci_dev *dev, struct ocxl_fn_config *fn,
 308                         struct ocxl_afu_config *afu)
 309 {
 310         int i, rc;
 311         u32 val, *ptr;
 312
 313         BUILD_BUG_ON(OCXL_AFU_NAME_SZ < OCXL_TEMPL_NAME_LEN);
 314         for (i = 0; i < OCXL_TEMPL_NAME_LEN; i += 4) {
 315                 rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_NAME + i, &val);
 316                 if (rc)
 317                         return rc;
 318                 ptr = (u32 *) &afu->name[i];
 319                 *ptr = val;
 320         }
 321         afu->name[OCXL_AFU_NAME_SZ - 1] = '\0'; /* play safe */
 322         return 0;
 323 }
 324
 325 static int read_afu_mmio(struct pci_dev *dev, struct ocxl_fn_config *fn,
 326                         struct ocxl_afu_config *afu)
 327 {
 328         int rc;
 329         u32 val;
 330
 331         /*
 332          * Global MMIO
 333          */
 334         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL, &val);
 335         if (rc)
 336                 return rc;
 337         afu->global_mmio_bar = EXTRACT_BITS(val, 0, 2);
 338         afu->global_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
 339
 340         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL + 4, &val);
 341         if (rc)
 342                 return rc;
 343         afu->global_mmio_offset += (u64) val << 32;
 344
 345         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ, &val);
 346         if (rc)
 347                 return rc;
 348         afu->global_mmio_size = val;
 349
 350         /*
 351          * Per-process MMIO
 352          */
 353         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP, &val);
 354         if (rc)
 355                 return rc;
 356         afu->pp_mmio_bar = EXTRACT_BITS(val, 0, 2);
 357         afu->pp_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
 358
 359         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP + 4, &val);
 360         if (rc)
 361                 return rc;
 362         afu->pp_mmio_offset += (u64) val << 32;
 363
 364         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP_SZ, &val);
 365         if (rc)
 366                 return rc;
 367         afu->pp_mmio_stride = val;
 368
 369         return 0;
 370 }
 371
 372 static int read_afu_control(struct pci_dev *dev, struct ocxl_afu_config *afu)
 373 {
 374         int pos;
 375         u8 val8;
 376         u16 val16;
 377
 378         pos = find_dvsec_afu_ctrl(dev, afu->idx);
 379         if (!pos) {
 380                 dev_err(&dev->dev, "Can't find AFU control DVSEC for AFU %d\n",
 381                         afu->idx);
 382                 return -ENODEV;
 383         }
 384         afu->dvsec_afu_control_pos = pos;
 385
 386         pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_SUP, &val8);
 387         afu->pasid_supported_log = EXTRACT_BITS(val8, 0, 4);
 388
 389         pci_read_config_word(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_SUP, &val16);
 390         afu->actag_supported = EXTRACT_BITS(val16, 0, 11);
 391         return 0;
 392 }
 393
 394 static bool char_allowed(int c)
 395 {
 396         /*
 397          * Permitted Characters : Alphanumeric, hyphen, underscore, comma
 398          */
 399         if ((c >= 0x30 && c <= 0x39) /* digits */ ||
 400                 (c >= 0x41 && c <= 0x5A) /* upper case */ ||
 401                 (c >= 0x61 && c <= 0x7A) /* lower case */ ||
 402                 c == 0 /* NULL */ ||
 403                 c == 0x2D /* - */ ||
 404                 c == 0x5F /* _ */ ||
 405                 c == 0x2C /* , */)
 406                 return true;
 407         return false;
 408 }
 409
 410 static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu)
 411 {
 412         int i;
 413
 414         if (!afu->name[0]) {
 415                 dev_err(&dev->dev, "Empty AFU name\n");
 416                 return -EINVAL;
 417         }
 418         for (i = 0; i < OCXL_TEMPL_NAME_LEN; i++) {
 419                 if (!char_allowed(afu->name[i])) {
 420                         dev_err(&dev->dev,
 421                                 "Invalid character in AFU name\n");
 422                         return -EINVAL;
 423                 }
 424         }
 425
 426         if (afu->global_mmio_bar != 0 &&
 427                 afu->global_mmio_bar != 2 &&
 428                 afu->global_mmio_bar != 4) {
 429                 dev_err(&dev->dev, "Invalid global MMIO bar number\n");
 430                 return -EINVAL;
 431         }
 432         if (afu->pp_mmio_bar != 0 &&
 433                 afu->pp_mmio_bar != 2 &&
 434                 afu->pp_mmio_bar != 4) {
 435                 dev_err(&dev->dev, "Invalid per-process MMIO bar number\n");
 436                 return -EINVAL;
 437         }
 438         return 0;
 439 }
 440
 441 int ocxl_config_read_afu(struct pci_dev *dev, struct ocxl_fn_config *fn,
 442                         struct ocxl_afu_config *afu, u8 afu_idx)
 443 {
 444         int rc;
 445         u32 val32;
 446
 447         /*
 448          * First, we need to write the AFU idx for the AFU we want to
 449          * access.
 450          */
 451         WARN_ON((afu_idx & OCXL_DVSEC_AFU_IDX_MASK) != afu_idx);
 452         afu->idx = afu_idx;
 453         pci_write_config_byte(dev,
 454                         fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
 455                         afu->idx);
 456
 457         rc = read_afu_name(dev, fn, afu);
 458         if (rc)
 459                 return rc;
 460
 461         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_AFU_VERSION, &val32);
 462         if (rc)
 463                 return rc;
 464         afu->version_major = EXTRACT_BITS(val32, 24, 31);
 465         afu->version_minor = EXTRACT_BITS(val32, 16, 23);
 466         afu->afuc_type = EXTRACT_BITS(val32, 14, 15);
 467         afu->afum_type = EXTRACT_BITS(val32, 12, 13);
 468         afu->profile = EXTRACT_BITS(val32, 0, 7);
 469
 470         rc = read_afu_mmio(dev, fn, afu);
 471         if (rc)
 472                 return rc;
 473
 474         rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MEM_SZ, &val32);
 475         if (rc)
 476                 return rc;
 477         afu->log_mem_size = EXTRACT_BITS(val32, 0, 7);
 478
 479         rc = read_afu_control(dev, afu);
 480         if (rc)
 481                 return rc;
 482
 483         dev_dbg(&dev->dev, "AFU configuration:\n");
 484         dev_dbg(&dev->dev, "  name = %s\n", afu->name);
 485         dev_dbg(&dev->dev, "  version = %d.%d\n", afu->version_major,
 486                 afu->version_minor);
 487         dev_dbg(&dev->dev, "  global mmio bar = %hhu\n", afu->global_mmio_bar);
 488         dev_dbg(&dev->dev, "  global mmio offset = %#llx\n",
 489                 afu->global_mmio_offset);
 490         dev_dbg(&dev->dev, "  global mmio size = %#x\n", afu->global_mmio_size);
 491         dev_dbg(&dev->dev, "  pp mmio bar = %hhu\n", afu->pp_mmio_bar);
 492         dev_dbg(&dev->dev, "  pp mmio offset = %#llx\n", afu->pp_mmio_offset);
 493         dev_dbg(&dev->dev, "  pp mmio stride = %#x\n", afu->pp_mmio_stride);
 494         dev_dbg(&dev->dev, "  mem size (log) = %hhu\n", afu->log_mem_size);
 495         dev_dbg(&dev->dev, "  pasid supported (log) = %u\n",
 496                 afu->pasid_supported_log);
 497         dev_dbg(&dev->dev, "  actag supported = %u\n",
 498                 afu->actag_supported);
 499
 500         rc = validate_afu(dev, afu);
 501         return rc;
 502 }
 503 EXPORT_SYMBOL_GPL(ocxl_config_read_afu);
 504
 505 int ocxl_config_get_actag_info(struct pci_dev *dev, u16 *base, u16 *enabled,
 506                         u16 *supported)
 507 {
 508         int rc;
 509
 510         /*
 511          * This is really a simple wrapper for the kernel API, to
 512          * avoid an external driver using ocxl as a library to call
 513          * platform-dependent code
 514          */
 515         rc = pnv_ocxl_get_actag(dev, base, enabled, supported);
 516         if (rc) {
 517                 dev_err(&dev->dev, "Can't get actag for device: %d\n", rc);
 518                 return rc;
 519         }
 520         return 0;
 521 }
 522 EXPORT_SYMBOL_GPL(ocxl_config_get_actag_info);
 523
 524 void ocxl_config_set_afu_actag(struct pci_dev *dev, int pos, int actag_base,
 525                         int actag_count)
 526 {
 527         u16 val;
 528
 529         val = actag_count & OCXL_DVSEC_ACTAG_MASK;
 530         pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_EN, val);
 531
 532         val = actag_base & OCXL_DVSEC_ACTAG_MASK;
 533         pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_BASE, val);
 534 }
 535 EXPORT_SYMBOL_GPL(ocxl_config_set_afu_actag);
 536
 537 int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count)
 538 {
 539         return pnv_ocxl_get_pasid_count(dev, count);
 540 }
 541 EXPORT_SYMBOL_GPL(ocxl_config_get_pasid_info);
 542
 543 void ocxl_config_set_afu_pasid(struct pci_dev *dev, int pos, int pasid_base,
 544                         u32 pasid_count_log)
 545 {
 546         u8 val8;
 547         u32 val32;
 548
 549         val8 = pasid_count_log & OCXL_DVSEC_PASID_LOG_MASK;
 550         pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_EN, val8);
 551
 552         pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
 553                         &val32);
 554         val32 &= ~OCXL_DVSEC_PASID_MASK;
 555         val32 |= pasid_base & OCXL_DVSEC_PASID_MASK;
 556         pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
 557                         val32);
 558 }
 559 EXPORT_SYMBOL_GPL(ocxl_config_set_afu_pasid);
 560
 561 void ocxl_config_set_afu_state(struct pci_dev *dev, int pos, int enable)
 562 {
 563         u8 val;
 564
 565         pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, &val);
 566         if (enable)
 567                 val |= 1;
 568         else
 569                 val &= 0xFE;
 570         pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, val);
 571 }
 572 EXPORT_SYMBOL_GPL(ocxl_config_set_afu_state);
 573
 574 int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec)
 575 {
 576         u32 val;
 577         __be32 *be32ptr;
 578         u8 timers;
 579         int i, rc;
 580         long recv_cap;
 581         char *recv_rate;
 582
 583         /*
 584          * Skip on function != 0, as the TL can only be defined on 0
 585          */
 586         if (PCI_FUNC(dev->devfn) != 0)
 587                 return 0;
 588
 589         recv_rate = kzalloc(PNV_OCXL_TL_RATE_BUF_SIZE, GFP_KERNEL);
 590         if (!recv_rate)
 591                 return -ENOMEM;
 592         /*
 593          * The spec defines 64 templates for messages in the
 594          * Transaction Layer (TL).
 595          *
 596          * The host and device each support a subset, so we need to
 597          * configure the transmitters on each side to send only
 598          * templates the receiver understands, at a rate the receiver
 599          * can process.  Per the spec, template 0 must be supported by
 600          * everybody. That's the template which has been used by the
 601          * host and device so far.
 602          *
 603          * The sending rate limit must be set before the template is
 604          * enabled.
 605          */
 606
 607         /*
 608          * Device -> host
 609          */
 610         rc = pnv_ocxl_get_tl_cap(dev, &recv_cap, recv_rate,
 611                                 PNV_OCXL_TL_RATE_BUF_SIZE);
 612         if (rc)
 613                 goto out;
 614
 615         for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
 616                 be32ptr = (__be32 *) &recv_rate[i];
 617                 pci_write_config_dword(dev,
 618                                 tl_dvsec + OCXL_DVSEC_TL_SEND_RATE + i,
 619                                 be32_to_cpu(*be32ptr));
 620         }
 621         val = recv_cap >> 32;
 622         pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP, val);
 623         val = recv_cap & GENMASK(31, 0);
 624         pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP + 4, val);
 625
 626         /*
 627          * Host -> device
 628          */
 629         for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
 630                 pci_read_config_dword(dev,
 631                                 tl_dvsec + OCXL_DVSEC_TL_RECV_RATE + i,
 632                                 &val);
 633                 be32ptr = (__be32 *) &recv_rate[i];
 634                 *be32ptr = cpu_to_be32(val);
 635         }
 636         pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP, &val);
 637         recv_cap = (long) val << 32;
 638         pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP + 4, &val);
 639         recv_cap |= val;
 640
 641         rc = pnv_ocxl_set_tl_conf(dev, recv_cap, __pa(recv_rate),
 642                                 PNV_OCXL_TL_RATE_BUF_SIZE);
 643         if (rc)
 644                 goto out;
 645
 646         /*
 647          * Opencapi commands needing to be retried are classified per
 648          * the TL in 2 groups: short and long commands.
 649          *
 650          * The short back off timer it not used for now. It will be
 651          * for opencapi 4.0.
 652          *
 653          * The long back off timer is typically used when an AFU hits
 654          * a page fault but the NPU is already processing one. So the
 655          * AFU needs to wait before it can resubmit. Having a value
 656          * too low doesn't break anything, but can generate extra
 657          * traffic on the link.
 658          * We set it to 1.6 us for now. It's shorter than, but in the
 659          * same order of magnitude as the time spent to process a page
 660          * fault.
 661          */
 662         timers = 0x2 << 4; /* long timer = 1.6 us */
 663         pci_write_config_byte(dev, tl_dvsec + OCXL_DVSEC_TL_BACKOFF_TIMERS,
 664                         timers);
 665
 666         rc = 0;
 667 out:
 668         kfree(recv_rate);
 669         return rc;
 670 }
 671 EXPORT_SYMBOL_GPL(ocxl_config_set_TL);
 672
 673 int ocxl_config_terminate_pasid(struct pci_dev *dev, int afu_control, int pasid)
 674 {
 675         u32 val;
 676         unsigned long timeout;
 677
 678         pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
 679                         &val);
 680         if (EXTRACT_BIT(val, 20)) {
 681                 dev_err(&dev->dev,
 682                         "Can't terminate PASID %#x, previous termination didn't complete\n",
 683                         pasid);
 684                 return -EBUSY;
 685         }
 686
 687         val &= ~OCXL_DVSEC_PASID_MASK;
 688         val |= pasid & OCXL_DVSEC_PASID_MASK;
 689         val |= BIT(20);
 690         pci_write_config_dword(dev,
 691                         afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
 692                         val);
 693
 694         timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
 695         pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
 696                         &val);
 697         while (EXTRACT_BIT(val, 20)) {
 698                 if (time_after_eq(jiffies, timeout)) {
 699                         dev_err(&dev->dev,
 700                                 "Timeout while waiting for AFU to terminate PASID %#x\n",
 701                                 pasid);
 702                         return -EBUSY;
 703                 }
 704                 cpu_relax();
 705                 pci_read_config_dword(dev,
 706                                 afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
 707                                 &val);
 708         }
 709         return 0;
 710 }
 711 EXPORT_SYMBOL_GPL(ocxl_config_terminate_pasid);
 712
 713 void ocxl_config_set_actag(struct pci_dev *dev, int func_dvsec, u32 tag_first,
 714                         u32 tag_count)
 715 {
 716         u32 val;
 717
 718         val = (tag_first & OCXL_DVSEC_ACTAG_MASK) << 16;
 719         val |= tag_count & OCXL_DVSEC_ACTAG_MASK;
 720         pci_write_config_dword(dev, func_dvsec + OCXL_DVSEC_FUNC_OFF_ACTAG,
 721                         val);
 722 }
 723 EXPORT_SYMBOL_GPL(ocxl_config_set_actag);