drivers/gpu/drm/i915/intel_csr.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24 #include <linux/firmware.h>
  25 #include "i915_drv.h"
  26 #include "i915_reg.h"
  27
  28 /**
  29  * DOC: csr support for dmc
  30  *
  31  * Display Context Save and Restore (CSR) firmware support added from gen9
  32  * onwards to drive newly added DMC (Display microcontroller) in display
  33  * engine to save and restore the state of display engine when it enter into
  34  * low-power state and comes back to normal.
  35  */
  36
  37 #define I915_CSR_GLK "/*(DEBLOBBED)*/"
  38 /*(DEBLOBBED)*/
  39 #define GLK_CSR_VERSION_REQUIRED        CSR_VERSION(1, 4)
  40
  41 #define I915_CSR_CNL "/*(DEBLOBBED)*/"
  42 /*(DEBLOBBED)*/
  43 #define CNL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 7)
  44
  45 #define I915_CSR_KBL "/*(DEBLOBBED)*/"
  46 /*(DEBLOBBED)*/
  47 #define KBL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 4)
  48
  49 #define I915_CSR_SKL "/*(DEBLOBBED)*/"
  50 /*(DEBLOBBED)*/
  51 #define SKL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 27)
  52
  53 #define I915_CSR_BXT "/*(DEBLOBBED)*/"
  54 /*(DEBLOBBED)*/
  55 #define BXT_CSR_VERSION_REQUIRED        CSR_VERSION(1, 7)
  56
  57
  58 #define CSR_MAX_FW_SIZE                 0x2FFF
  59 #define CSR_DEFAULT_FW_OFFSET           0xFFFFFFFF
  60
  61 struct intel_css_header {
  62         /* 0x09 for DMC */
  63         uint32_t module_type;
  64
  65         /* Includes the DMC specific header in dwords */
  66         uint32_t header_len;
  67
  68         /* always value would be 0x10000 */
  69         uint32_t header_ver;
  70
  71         /* Not used */
  72         uint32_t module_id;
  73
  74         /* Not used */
  75         uint32_t module_vendor;
  76
  77         /* in YYYYMMDD format */
  78         uint32_t date;
  79
  80         /* Size in dwords (CSS_Headerlen + PackageHeaderLen + dmc FWsLen)/4 */
  81         uint32_t size;
  82
  83         /* Not used */
  84         uint32_t key_size;
  85
  86         /* Not used */
  87         uint32_t modulus_size;
  88
  89         /* Not used */
  90         uint32_t exponent_size;
  91
  92         /* Not used */
  93         uint32_t reserved1[12];
  94
  95         /* Major Minor */
  96         uint32_t version;
  97
  98         /* Not used */
  99         uint32_t reserved2[8];
 100
 101         /* Not used */
 102         uint32_t kernel_header_info;
 103 } __packed;
 104
 105 struct intel_fw_info {
 106         uint16_t reserved1;
 107
 108         /* Stepping (A, B, C, ..., *). * is a wildcard */
 109         char stepping;
 110
 111         /* Sub-stepping (0, 1, ..., *). * is a wildcard */
 112         char substepping;
 113
 114         uint32_t offset;
 115         uint32_t reserved2;
 116 } __packed;
 117
 118 struct intel_package_header {
 119         /* DMC container header length in dwords */
 120         unsigned char header_len;
 121
 122         /* always value would be 0x01 */
 123         unsigned char header_ver;
 124
 125         unsigned char reserved[10];
 126
 127         /* Number of valid entries in the FWInfo array below */
 128         uint32_t num_entries;
 129
 130         struct intel_fw_info fw_info[20];
 131 } __packed;
 132
 133 struct intel_dmc_header {
 134         /* always value would be 0x40403E3E */
 135         uint32_t signature;
 136
 137         /* DMC binary header length */
 138         unsigned char header_len;
 139
 140         /* 0x01 */
 141         unsigned char header_ver;
 142
 143         /* Reserved */
 144         uint16_t dmcc_ver;
 145
 146         /* Major, Minor */
 147         uint32_t        project;
 148
 149         /* Firmware program size (excluding header) in dwords */
 150         uint32_t        fw_size;
 151
 152         /* Major Minor version */
 153         uint32_t fw_version;
 154
 155         /* Number of valid MMIO cycles present. */
 156         uint32_t mmio_count;
 157
 158         /* MMIO address */
 159         uint32_t mmioaddr[8];
 160
 161         /* MMIO data */
 162         uint32_t mmiodata[8];
 163
 164         /* FW filename  */
 165         unsigned char dfile[32];
 166
 167         uint32_t reserved1[2];
 168 } __packed;
 169
 170 struct stepping_info {
 171         char stepping;
 172         char substepping;
 173 };
 174
 175 static const struct stepping_info skl_stepping_info[] = {
 176         {'A', '0'}, {'B', '0'}, {'C', '0'},
 177         {'D', '0'}, {'E', '0'}, {'F', '0'},
 178         {'G', '0'}, {'H', '0'}, {'I', '0'},
 179         {'J', '0'}, {'K', '0'}
 180 };
 181
 182 static const struct stepping_info bxt_stepping_info[] = {
 183         {'A', '0'}, {'A', '1'}, {'A', '2'},
 184         {'B', '0'}, {'B', '1'}, {'B', '2'}
 185 };
 186
 187 static const struct stepping_info no_stepping_info = { '*', '*' };
 188
 189 static const struct stepping_info *
 190 intel_get_stepping_info(struct drm_i915_private *dev_priv)
 191 {
 192         const struct stepping_info *si;
 193         unsigned int size;
 194
 195         if (IS_SKYLAKE(dev_priv)) {
 196                 size = ARRAY_SIZE(skl_stepping_info);
 197                 si = skl_stepping_info;
 198         } else if (IS_BROXTON(dev_priv)) {
 199                 size = ARRAY_SIZE(bxt_stepping_info);
 200                 si = bxt_stepping_info;
 201         } else {
 202                 size = 0;
 203                 si = NULL;
 204         }
 205
 206         if (INTEL_REVID(dev_priv) < size)
 207                 return si + INTEL_REVID(dev_priv);
 208
 209         return &no_stepping_info;
 210 }
 211
 212 static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
 213 {
 214         uint32_t val, mask;
 215
 216         mask = DC_STATE_DEBUG_MASK_MEMORY_UP;
 217
 218         if (IS_GEN9_LP(dev_priv))
 219                 mask |= DC_STATE_DEBUG_MASK_CORES;
 220
 221         /* The below bit doesn't need to be cleared ever afterwards */
 222         val = I915_READ(DC_STATE_DEBUG);
 223         if ((val & mask) != mask) {
 224                 val |= mask;
 225                 I915_WRITE(DC_STATE_DEBUG, val);
 226                 POSTING_READ(DC_STATE_DEBUG);
 227         }
 228 }
 229
 230 /**
 231  * intel_csr_load_program() - write the firmware from memory to register.
 232  * @dev_priv: i915 drm device.
 233  *
 234  * CSR firmware is read from a .bin file and kept in internal memory one time.
 235  * Everytime display comes back from low power state this function is called to
 236  * copy the firmware from internal memory to registers.
 237  */
 238 void intel_csr_load_program(struct drm_i915_private *dev_priv)
 239 {
 240         u32 *payload = dev_priv->csr.dmc_payload;
 241         uint32_t i, fw_size;
 242
 243         if (!HAS_CSR(dev_priv)) {
 244                 DRM_ERROR("No CSR support available for this platform\n");
 245                 return;
 246         }
 247
 248         if (!dev_priv->csr.dmc_payload) {
 249                 DRM_ERROR("Tried to program CSR with empty payload\n");
 250                 return;
 251         }
 252
 253         fw_size = dev_priv->csr.dmc_fw_size;
 254         assert_rpm_wakelock_held(dev_priv);
 255
 256         preempt_disable();
 257
 258         for (i = 0; i < fw_size; i++)
 259                 I915_WRITE_FW(CSR_PROGRAM(i), payload[i]);
 260
 261         preempt_enable();
 262
 263         for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 264                 I915_WRITE(dev_priv->csr.mmioaddr[i],
 265                            dev_priv->csr.mmiodata[i]);
 266         }
 267
 268         dev_priv->csr.dc_state = 0;
 269
 270         gen9_set_dc_state_debugmask(dev_priv);
 271 }
 272
 273 static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
 274                               const struct firmware *fw)
 275 {
 276         struct intel_css_header *css_header;
 277         struct intel_package_header *package_header;
 278         struct intel_dmc_header *dmc_header;
 279         struct intel_csr *csr = &dev_priv->csr;
 280         const struct stepping_info *si = intel_get_stepping_info(dev_priv);
 281         uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
 282         uint32_t i;
 283         uint32_t *dmc_payload;
 284         uint32_t required_version;
 285         size_t fsize;
 286
 287         if (!fw)
 288                 return NULL;
 289
 290         fsize = sizeof(struct intel_css_header) +
 291                 sizeof(struct intel_package_header) +
 292                 sizeof(struct intel_dmc_header);
 293         if (fsize > fw->size)
 294                 goto error_truncated;
 295
 296         /* Extract CSS Header information*/
 297         css_header = (struct intel_css_header *)fw->data;
 298         if (sizeof(struct intel_css_header) !=
 299             (css_header->header_len * 4)) {
 300                 DRM_ERROR("DMC firmware has wrong CSS header length "
 301                           "(%u bytes)\n",
 302                           (css_header->header_len * 4));
 303                 return NULL;
 304         }
 305
 306         csr->version = css_header->version;
 307
 308         if (csr->fw_path == i915_modparams.dmc_firmware_path) {
 309                 /* Bypass version check for firmware override. */
 310                 required_version = csr->version;
 311         } else if (IS_CANNONLAKE(dev_priv)) {
 312                 required_version = CNL_CSR_VERSION_REQUIRED;
 313         } else if (IS_GEMINILAKE(dev_priv)) {
 314                 required_version = GLK_CSR_VERSION_REQUIRED;
 315         } else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) {
 316                 required_version = KBL_CSR_VERSION_REQUIRED;
 317         } else if (IS_SKYLAKE(dev_priv)) {
 318                 required_version = SKL_CSR_VERSION_REQUIRED;
 319         } else if (IS_BROXTON(dev_priv)) {
 320                 required_version = BXT_CSR_VERSION_REQUIRED;
 321         } else {
 322                 MISSING_CASE(INTEL_REVID(dev_priv));
 323                 required_version = 0;
 324         }
 325
 326         if (csr->version != required_version) {
 327                 DRM_INFO("Refusing to load DMC firmware v%u.%u,"
 328                          " please use v%u.%u\n",
 329                          CSR_VERSION_MAJOR(csr->version),
 330                          CSR_VERSION_MINOR(csr->version),
 331                          CSR_VERSION_MAJOR(required_version),
 332                          CSR_VERSION_MINOR(required_version));
 333                 return NULL;
 334         }
 335
 336         readcount += sizeof(struct intel_css_header);
 337
 338         /* Extract Package Header information*/
 339         package_header = (struct intel_package_header *)
 340                 &fw->data[readcount];
 341         if (sizeof(struct intel_package_header) !=
 342             (package_header->header_len * 4)) {
 343                 DRM_ERROR("DMC firmware has wrong package header length "
 344                           "(%u bytes)\n",
 345                           (package_header->header_len * 4));
 346                 return NULL;
 347         }
 348         readcount += sizeof(struct intel_package_header);
 349
 350         /* Search for dmc_offset to find firware binary. */
 351         for (i = 0; i < package_header->num_entries; i++) {
 352                 if (package_header->fw_info[i].substepping == '*' &&
 353                     si->stepping == package_header->fw_info[i].stepping) {
 354                         dmc_offset = package_header->fw_info[i].offset;
 355                         break;
 356                 } else if (si->stepping == package_header->fw_info[i].stepping &&
 357                            si->substepping == package_header->fw_info[i].substepping) {
 358                         dmc_offset = package_header->fw_info[i].offset;
 359                         break;
 360                 } else if (package_header->fw_info[i].stepping == '*' &&
 361                            package_header->fw_info[i].substepping == '*')
 362                         dmc_offset = package_header->fw_info[i].offset;
 363         }
 364         if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
 365                 DRM_ERROR("DMC firmware not supported for %c stepping\n",
 366                           si->stepping);
 367                 return NULL;
 368         }
 369         readcount += dmc_offset;
 370         fsize += dmc_offset;
 371         if (fsize > fw->size)
 372                 goto error_truncated;
 373
 374         /* Extract dmc_header information. */
 375         dmc_header = (struct intel_dmc_header *)&fw->data[readcount];
 376         if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) {
 377                 DRM_ERROR("DMC firmware has wrong dmc header length "
 378                           "(%u bytes)\n",
 379                           (dmc_header->header_len));
 380                 return NULL;
 381         }
 382         readcount += sizeof(struct intel_dmc_header);
 383
 384         /* Cache the dmc header info. */
 385         if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
 386                 DRM_ERROR("DMC firmware has wrong mmio count %u\n",
 387                           dmc_header->mmio_count);
 388                 return NULL;
 389         }
 390         csr->mmio_count = dmc_header->mmio_count;
 391         for (i = 0; i < dmc_header->mmio_count; i++) {
 392                 if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
 393                     dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
 394                         DRM_ERROR("DMC firmware has wrong mmio address 0x%x\n",
 395                                   dmc_header->mmioaddr[i]);
 396                         return NULL;
 397                 }
 398                 csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]);
 399                 csr->mmiodata[i] = dmc_header->mmiodata[i];
 400         }
 401
 402         /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
 403         nbytes = dmc_header->fw_size * 4;
 404         fsize += nbytes;
 405         if (fsize > fw->size)
 406                 goto error_truncated;
 407
 408         if (nbytes > CSR_MAX_FW_SIZE) {
 409                 DRM_ERROR("DMC firmware too big (%u bytes)\n", nbytes);
 410                 return NULL;
 411         }
 412         csr->dmc_fw_size = dmc_header->fw_size;
 413
 414         dmc_payload = kmalloc(nbytes, GFP_KERNEL);
 415         if (!dmc_payload) {
 416                 DRM_ERROR("Memory allocation failed for dmc payload\n");
 417                 return NULL;
 418         }
 419
 420         return memcpy(dmc_payload, &fw->data[readcount], nbytes);
 421
 422 error_truncated:
 423         DRM_ERROR("Truncated DMC firmware, rejecting.\n");
 424         return NULL;
 425 }
 426
 427 static void csr_load_work_fn(struct work_struct *work)
 428 {
 429         struct drm_i915_private *dev_priv;
 430         struct intel_csr *csr;
 431         const struct firmware *fw = NULL;
 432
 433         dev_priv = container_of(work, typeof(*dev_priv), csr.work);
 434         csr = &dev_priv->csr;
 435
 436         reject_firmware(&fw, dev_priv->csr.fw_path, &dev_priv->drm.pdev->dev);
 437         if (fw)
 438                 dev_priv->csr.dmc_payload = parse_csr_fw(dev_priv, fw);
 439
 440         if (dev_priv->csr.dmc_payload) {
 441                 intel_csr_load_program(dev_priv);
 442
 443                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 444
 445                 DRM_INFO("Finished loading DMC firmware %s (v%u.%u)\n",
 446                          dev_priv->csr.fw_path,
 447                          CSR_VERSION_MAJOR(csr->version),
 448                          CSR_VERSION_MINOR(csr->version));
 449         } else {
 450                 dev_notice(dev_priv->drm.dev,
 451                            "Failed to load DMC firmware %s."
 452                            " Disabling runtime power management.\n",
 453                            csr->fw_path);
 454                 dev_notice(dev_priv->drm.dev, "DMC firmware homepage: %s",
 455                            INTEL_UC_FIRMWARE_URL);
 456         }
 457
 458         release_firmware(fw);
 459 }
 460
 461 /**
 462  * intel_csr_ucode_init() - initialize the firmware loading.
 463  * @dev_priv: i915 drm device.
 464  *
 465  * This function is called at the time of loading the display driver to read
 466  * firmware from a .bin file and copied into a internal memory.
 467  */
 468 void intel_csr_ucode_init(struct drm_i915_private *dev_priv)
 469 {
 470         struct intel_csr *csr = &dev_priv->csr;
 471
 472         INIT_WORK(&dev_priv->csr.work, csr_load_work_fn);
 473
 474         if (!HAS_CSR(dev_priv))
 475                 return;
 476
 477         if (i915_modparams.dmc_firmware_path)
 478                 csr->fw_path = i915_modparams.dmc_firmware_path;
 479         else if (IS_CANNONLAKE(dev_priv))
 480                 csr->fw_path = I915_CSR_CNL;
 481         else if (IS_GEMINILAKE(dev_priv))
 482                 csr->fw_path = I915_CSR_GLK;
 483         else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
 484                 csr->fw_path = I915_CSR_KBL;
 485         else if (IS_SKYLAKE(dev_priv))
 486                 csr->fw_path = I915_CSR_SKL;
 487         else if (IS_BROXTON(dev_priv))
 488                 csr->fw_path = I915_CSR_BXT;
 489         else {
 490                 DRM_ERROR("Unexpected: no known CSR firmware for platform\n");
 491                 return;
 492         }
 493
 494         DRM_DEBUG_KMS("Loading %s\n", csr->fw_path);
 495
 496         /*
 497          * Obtain a runtime pm reference, until CSR is loaded,
 498          * to avoid entering runtime-suspend.
 499          */
 500         intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 501
 502         schedule_work(&dev_priv->csr.work);
 503 }
 504
 505 /**
 506  * intel_csr_ucode_suspend() - prepare CSR firmware before system suspend
 507  * @dev_priv: i915 drm device
 508  *
 509  * Prepare the DMC firmware before entering system suspend. This includes
 510  * flushing pending work items and releasing any resources acquired during
 511  * init.
 512  */
 513 void intel_csr_ucode_suspend(struct drm_i915_private *dev_priv)
 514 {
 515         if (!HAS_CSR(dev_priv))
 516                 return;
 517
 518         flush_work(&dev_priv->csr.work);
 519
 520         /* Drop the reference held in case DMC isn't loaded. */
 521         if (!dev_priv->csr.dmc_payload)
 522                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 523 }
 524
 525 /**
 526  * intel_csr_ucode_resume() - init CSR firmware during system resume
 527  * @dev_priv: i915 drm device
 528  *
 529  * Reinitialize the DMC firmware during system resume, reacquiring any
 530  * resources released in intel_csr_ucode_suspend().
 531  */
 532 void intel_csr_ucode_resume(struct drm_i915_private *dev_priv)
 533 {
 534         if (!HAS_CSR(dev_priv))
 535                 return;
 536
 537         /*
 538          * Reacquire the reference to keep RPM disabled in case DMC isn't
 539          * loaded.
 540          */
 541         if (!dev_priv->csr.dmc_payload)
 542                 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 543 }
 544
 545 /**
 546  * intel_csr_ucode_fini() - unload the CSR firmware.
 547  * @dev_priv: i915 drm device.
 548  *
 549  * Firmmware unloading includes freeing the internal memory and reset the
 550  * firmware loading status.
 551  */
 552 void intel_csr_ucode_fini(struct drm_i915_private *dev_priv)
 553 {
 554         if (!HAS_CSR(dev_priv))
 555                 return;
 556
 557         intel_csr_ucode_suspend(dev_priv);
 558
 559         kfree(dev_priv->csr.dmc_payload);
 560 }