drivers/platform/x86/intel/ifs/runtest.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright(c) 2022 Intel Corporation. */
   3
   4 #include <linux/cpu.h>
   5 #include <linux/delay.h>
   6 #include <linux/fs.h>
   7 #include <linux/nmi.h>
   8 #include <linux/slab.h>
   9 #include <linux/stop_machine.h>
  10
  11 #include "ifs.h"
  12
  13 /*
  14  * Note all code and data in this file is protected by
  15  * ifs_sem. On HT systems all threads on a core will
  16  * execute together, but only the first thread on the
  17  * core will update results of the test.
  18  */
  19
  20 #define CREATE_TRACE_POINTS
  21 #include <trace/events/intel_ifs.h>
  22
  23 /* Max retries on the same chunk */
  24 #define MAX_IFS_RETRIES  5
  25
  26 struct run_params {
  27         struct ifs_data *ifsd;
  28         union ifs_scan *activate;
  29         union ifs_status status;
  30 };
  31
  32 struct sbaf_run_params {
  33         struct ifs_data *ifsd;
  34         int *retry_cnt;
  35         union ifs_sbaf *activate;
  36         union ifs_sbaf_status status;
  37 };
  38
  39 /*
  40  * Number of TSC cycles that a logical CPU will wait for the other
  41  * logical CPU on the core in the WRMSR(ACTIVATE_SCAN).
  42  */
  43 #define IFS_THREAD_WAIT 100000
  44
  45 enum ifs_status_err_code {
  46         IFS_NO_ERROR                            = 0,
  47         IFS_OTHER_THREAD_COULD_NOT_JOIN         = 1,
  48         IFS_INTERRUPTED_BEFORE_RENDEZVOUS       = 2,
  49         IFS_POWER_MGMT_INADEQUATE_FOR_SCAN      = 3,
  50         IFS_INVALID_CHUNK_RANGE                 = 4,
  51         IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS  = 5,
  52         IFS_CORE_NOT_CAPABLE_CURRENTLY          = 6,
  53         IFS_UNASSIGNED_ERROR_CODE               = 7,
  54         IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT = 8,
  55         IFS_INTERRUPTED_DURING_EXECUTION        = 9,
  56         IFS_UNASSIGNED_ERROR_CODE_0xA           = 0xA,
  57         IFS_CORRUPTED_CHUNK             = 0xB,
  58 };
  59
  60 static const char * const scan_test_status[] = {
  61         [IFS_NO_ERROR] = "SCAN no error",
  62         [IFS_OTHER_THREAD_COULD_NOT_JOIN] = "Other thread could not join.",
  63         [IFS_INTERRUPTED_BEFORE_RENDEZVOUS] = "Interrupt occurred prior to SCAN coordination.",
  64         [IFS_POWER_MGMT_INADEQUATE_FOR_SCAN] =
  65         "Core Abort SCAN Response due to power management condition.",
  66         [IFS_INVALID_CHUNK_RANGE] = "Non valid chunks in the range",
  67         [IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS] = "Mismatch in arguments between threads T0/T1.",
  68         [IFS_CORE_NOT_CAPABLE_CURRENTLY] = "Core not capable of performing SCAN currently",
  69         [IFS_UNASSIGNED_ERROR_CODE] = "Unassigned error code 0x7",
  70         [IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT] =
  71         "Exceeded number of Logical Processors (LP) allowed to run Scan-At-Field concurrently",
  72         [IFS_INTERRUPTED_DURING_EXECUTION] = "Interrupt occurred prior to SCAN start",
  73         [IFS_UNASSIGNED_ERROR_CODE_0xA] = "Unassigned error code 0xA",
  74         [IFS_CORRUPTED_CHUNK] = "Scan operation aborted due to corrupted image. Try reloading",
  75 };
  76
  77 static void message_not_tested(struct device *dev, int cpu, union ifs_status status)
  78 {
  79         struct ifs_data *ifsd = ifs_get_data(dev);
  80
  81         /*
  82          * control_error is set when the microcode runs into a problem
  83          * loading the image from the reserved BIOS memory, or it has
  84          * been corrupted. Reloading the image may fix this issue.
  85          */
  86         if (status.control_error) {
  87                 dev_warn(dev, "CPU(s) %*pbl: Scan controller error. Batch: %02x version: 0x%x\n",
  88                          cpumask_pr_args(cpu_smt_mask(cpu)), ifsd->cur_batch, ifsd->loaded_version);
  89                 return;
  90         }
  91
  92         if (status.error_code < ARRAY_SIZE(scan_test_status)) {
  93                 dev_info(dev, "CPU(s) %*pbl: SCAN operation did not start. %s\n",
  94                          cpumask_pr_args(cpu_smt_mask(cpu)),
  95                          scan_test_status[status.error_code]);
  96         } else if (status.error_code == IFS_SW_TIMEOUT) {
  97                 dev_info(dev, "CPU(s) %*pbl: software timeout during scan\n",
  98                          cpumask_pr_args(cpu_smt_mask(cpu)));
  99         } else if (status.error_code == IFS_SW_PARTIAL_COMPLETION) {
 100                 dev_info(dev, "CPU(s) %*pbl: %s\n",
 101                          cpumask_pr_args(cpu_smt_mask(cpu)),
 102                          "Not all scan chunks were executed. Maximum forward progress retries exceeded");
 103         } else {
 104                 dev_info(dev, "CPU(s) %*pbl: SCAN unknown status %llx\n",
 105                          cpumask_pr_args(cpu_smt_mask(cpu)), status.data);
 106         }
 107 }
 108
 109 static void message_fail(struct device *dev, int cpu, union ifs_status status)
 110 {
 111         struct ifs_data *ifsd = ifs_get_data(dev);
 112
 113         /*
 114          * signature_error is set when the output from the scan chains does not
 115          * match the expected signature. This might be a transient problem (e.g.
 116          * due to a bit flip from an alpha particle or neutron). If the problem
 117          * repeats on a subsequent test, then it indicates an actual problem in
 118          * the core being tested.
 119          */
 120         if (status.signature_error) {
 121                 dev_err(dev, "CPU(s) %*pbl: test signature incorrect. Batch: %02x version: 0x%x\n",
 122                         cpumask_pr_args(cpu_smt_mask(cpu)), ifsd->cur_batch, ifsd->loaded_version);
 123         }
 124 }
 125
 126 static bool can_restart(union ifs_status status)
 127 {
 128         enum ifs_status_err_code err_code = status.error_code;
 129
 130         /* Signature for chunk is bad, or scan test failed */
 131         if (status.signature_error || status.control_error)
 132                 return false;
 133
 134         switch (err_code) {
 135         case IFS_NO_ERROR:
 136         case IFS_OTHER_THREAD_COULD_NOT_JOIN:
 137         case IFS_INTERRUPTED_BEFORE_RENDEZVOUS:
 138         case IFS_POWER_MGMT_INADEQUATE_FOR_SCAN:
 139         case IFS_EXCEED_NUMBER_OF_THREADS_CONCURRENT:
 140         case IFS_INTERRUPTED_DURING_EXECUTION:
 141                 return true;
 142         case IFS_INVALID_CHUNK_RANGE:
 143         case IFS_MISMATCH_ARGUMENTS_BETWEEN_THREADS:
 144         case IFS_CORE_NOT_CAPABLE_CURRENTLY:
 145         case IFS_UNASSIGNED_ERROR_CODE:
 146         case IFS_UNASSIGNED_ERROR_CODE_0xA:
 147         case IFS_CORRUPTED_CHUNK:
 148                 break;
 149         }
 150         return false;
 151 }
 152
 153 #define SPINUNIT 100 /* 100 nsec */
 154 static atomic_t array_cpus_in;
 155 static atomic_t scan_cpus_in;
 156 static atomic_t sbaf_cpus_in;
 157
 158 /*
 159  * Simplified cpu sibling rendezvous loop based on microcode loader __wait_for_cpus()
 160  */
 161 static void wait_for_sibling_cpu(atomic_t *t, long long timeout)
 162 {
 163         int cpu = smp_processor_id();
 164         const struct cpumask *smt_mask = cpu_smt_mask(cpu);
 165         int all_cpus = cpumask_weight(smt_mask);
 166
 167         atomic_inc(t);
 168         while (atomic_read(t) < all_cpus) {
 169                 if (timeout < SPINUNIT)
 170                         return;
 171                 ndelay(SPINUNIT);
 172                 timeout -= SPINUNIT;
 173                 touch_nmi_watchdog();
 174         }
 175 }
 176
 177 /*
 178  * Execute the scan. Called "simultaneously" on all threads of a core
 179  * at high priority using the stop_cpus mechanism.
 180  */
 181 static int doscan(void *data)
 182 {
 183         int cpu = smp_processor_id(), start, stop;
 184         struct run_params *params = data;
 185         union ifs_status status;
 186         struct ifs_data *ifsd;
 187         int first;
 188
 189         ifsd = params->ifsd;
 190
 191         if (ifsd->generation) {
 192                 start = params->activate->gen2.start;
 193                 stop = params->activate->gen2.stop;
 194         } else {
 195                 start = params->activate->gen0.start;
 196                 stop = params->activate->gen0.stop;
 197         }
 198
 199         /* Only the first logical CPU on a core reports result */
 200         first = cpumask_first(cpu_smt_mask(cpu));
 201
 202         wait_for_sibling_cpu(&scan_cpus_in, NSEC_PER_SEC);
 203
 204         /*
 205          * This WRMSR will wait for other HT threads to also write
 206          * to this MSR (at most for activate.delay cycles). Then it
 207          * starts scan of each requested chunk. The core scan happens
 208          * during the "execution" of the WRMSR. This instruction can
 209          * take up to 200 milliseconds (in the case where all chunks
 210          * are processed in a single pass) before it retires.
 211          */
 212         wrmsrl(MSR_ACTIVATE_SCAN, params->activate->data);
 213         rdmsrl(MSR_SCAN_STATUS, status.data);
 214
 215         trace_ifs_status(ifsd->cur_batch, start, stop, status.data);
 216
 217         /* Pass back the result of the scan */
 218         if (cpu == first)
 219                 params->status = status;
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Use stop_core_cpuslocked() to synchronize writing to MSR_ACTIVATE_SCAN
 226  * on all threads of the core to be tested. Loop if necessary to complete
 227  * run of all chunks. Include some defensive tests to make sure forward
 228  * progress is made, and that the whole test completes in a reasonable time.
 229  */
 230 static void ifs_test_core(int cpu, struct device *dev)
 231 {
 232         union ifs_status status = {};
 233         union ifs_scan activate;
 234         unsigned long timeout;
 235         struct ifs_data *ifsd;
 236         int to_start, to_stop;
 237         int status_chunk;
 238         struct run_params params;
 239         int retries;
 240
 241         ifsd = ifs_get_data(dev);
 242
 243         activate.gen0.rsvd = 0;
 244         activate.delay = IFS_THREAD_WAIT;
 245         activate.sigmce = 0;
 246         to_start = 0;
 247         to_stop = ifsd->valid_chunks - 1;
 248
 249         params.ifsd = ifs_get_data(dev);
 250
 251         if (ifsd->generation) {
 252                 activate.gen2.start = to_start;
 253                 activate.gen2.stop = to_stop;
 254         } else {
 255                 activate.gen0.start = to_start;
 256                 activate.gen0.stop = to_stop;
 257         }
 258
 259         timeout = jiffies + HZ / 2;
 260         retries = MAX_IFS_RETRIES;
 261
 262         while (to_start <= to_stop) {
 263                 if (time_after(jiffies, timeout)) {
 264                         status.error_code = IFS_SW_TIMEOUT;
 265                         break;
 266                 }
 267
 268                 params.activate = &activate;
 269                 atomic_set(&scan_cpus_in, 0);
 270                 stop_core_cpuslocked(cpu, doscan, &params);
 271
 272                 status = params.status;
 273
 274                 /* Some cases can be retried, give up for others */
 275                 if (!can_restart(status))
 276                         break;
 277
 278                 status_chunk = ifsd->generation ? status.gen2.chunk_num : status.gen0.chunk_num;
 279                 if (status_chunk == to_start) {
 280                         /* Check for forward progress */
 281                         if (--retries == 0) {
 282                                 if (status.error_code == IFS_NO_ERROR)
 283                                         status.error_code = IFS_SW_PARTIAL_COMPLETION;
 284                                 break;
 285                         }
 286                 } else {
 287                         retries = MAX_IFS_RETRIES;
 288                         if (ifsd->generation)
 289                                 activate.gen2.start = status_chunk;
 290                         else
 291                                 activate.gen0.start = status_chunk;
 292                         to_start = status_chunk;
 293                 }
 294         }
 295
 296         /* Update status for this core */
 297         ifsd->scan_details = status.data;
 298
 299         if (status.signature_error) {
 300                 ifsd->status = SCAN_TEST_FAIL;
 301                 message_fail(dev, cpu, status);
 302         } else if (status.control_error || status.error_code) {
 303                 ifsd->status = SCAN_NOT_TESTED;
 304                 message_not_tested(dev, cpu, status);
 305         } else {
 306                 ifsd->status = SCAN_TEST_PASS;
 307         }
 308 }
 309
 310 static int do_array_test(void *data)
 311 {
 312         union ifs_array *command = data;
 313         int cpu = smp_processor_id();
 314         int first;
 315
 316         wait_for_sibling_cpu(&array_cpus_in, NSEC_PER_SEC);
 317
 318         /*
 319          * Only one logical CPU on a core needs to trigger the Array test via MSR write.
 320          */
 321         first = cpumask_first(cpu_smt_mask(cpu));
 322
 323         if (cpu == first) {
 324                 wrmsrl(MSR_ARRAY_BIST, command->data);
 325                 /* Pass back the result of the test */
 326                 rdmsrl(MSR_ARRAY_BIST, command->data);
 327         }
 328
 329         return 0;
 330 }
 331
 332 static void ifs_array_test_core(int cpu, struct device *dev)
 333 {
 334         union ifs_array command = {};
 335         bool timed_out = false;
 336         struct ifs_data *ifsd;
 337         unsigned long timeout;
 338
 339         ifsd = ifs_get_data(dev);
 340
 341         command.array_bitmask = ~0U;
 342         timeout = jiffies + HZ / 2;
 343
 344         do {
 345                 if (time_after(jiffies, timeout)) {
 346                         timed_out = true;
 347                         break;
 348                 }
 349                 atomic_set(&array_cpus_in, 0);
 350                 stop_core_cpuslocked(cpu, do_array_test, &command);
 351
 352                 if (command.ctrl_result)
 353                         break;
 354         } while (command.array_bitmask);
 355
 356         ifsd->scan_details = command.data;
 357
 358         if (command.ctrl_result)
 359                 ifsd->status = SCAN_TEST_FAIL;
 360         else if (timed_out || command.array_bitmask)
 361                 ifsd->status = SCAN_NOT_TESTED;
 362         else
 363                 ifsd->status = SCAN_TEST_PASS;
 364 }
 365
 366 #define ARRAY_GEN1_TEST_ALL_ARRAYS      0x0ULL
 367 #define ARRAY_GEN1_STATUS_FAIL          0x1ULL
 368
 369 static int do_array_test_gen1(void *status)
 370 {
 371         int cpu = smp_processor_id();
 372         int first;
 373
 374         first = cpumask_first(cpu_smt_mask(cpu));
 375
 376         if (cpu == first) {
 377                 wrmsrl(MSR_ARRAY_TRIGGER, ARRAY_GEN1_TEST_ALL_ARRAYS);
 378                 rdmsrl(MSR_ARRAY_STATUS, *((u64 *)status));
 379         }
 380
 381         return 0;
 382 }
 383
 384 static void ifs_array_test_gen1(int cpu, struct device *dev)
 385 {
 386         struct ifs_data *ifsd = ifs_get_data(dev);
 387         u64 status = 0;
 388
 389         stop_core_cpuslocked(cpu, do_array_test_gen1, &status);
 390         ifsd->scan_details = status;
 391
 392         if (status & ARRAY_GEN1_STATUS_FAIL)
 393                 ifsd->status = SCAN_TEST_FAIL;
 394         else
 395                 ifsd->status = SCAN_TEST_PASS;
 396 }
 397
 398 #define SBAF_STATUS_PASS                        0
 399 #define SBAF_STATUS_SIGN_FAIL                   1
 400 #define SBAF_STATUS_INTR                        2
 401 #define SBAF_STATUS_TEST_FAIL                   3
 402
 403 enum sbaf_status_err_code {
 404         IFS_SBAF_NO_ERROR                               = 0,
 405         IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN            = 1,
 406         IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS          = 2,
 407         IFS_SBAF_UNASSIGNED_ERROR_CODE3                 = 3,
 408         IFS_SBAF_INVALID_BUNDLE_INDEX                   = 4,
 409         IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS          = 5,
 410         IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY             = 6,
 411         IFS_SBAF_UNASSIGNED_ERROR_CODE7                 = 7,
 412         IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT    = 8,
 413         IFS_SBAF_INTERRUPTED_DURING_EXECUTION           = 9,
 414         IFS_SBAF_INVALID_PROGRAM_INDEX                  = 0xA,
 415         IFS_SBAF_CORRUPTED_CHUNK                        = 0xB,
 416         IFS_SBAF_DID_NOT_START                          = 0xC,
 417 };
 418
 419 static const char * const sbaf_test_status[] = {
 420         [IFS_SBAF_NO_ERROR] = "SBAF no error",
 421         [IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN] = "Other thread could not join.",
 422         [IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS] = "Interrupt occurred prior to SBAF coordination.",
 423         [IFS_SBAF_UNASSIGNED_ERROR_CODE3] = "Unassigned error code 0x3",
 424         [IFS_SBAF_INVALID_BUNDLE_INDEX] = "Non-valid sbaf bundles. Reload test image",
 425         [IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS] = "Mismatch in arguments between threads T0/T1.",
 426         [IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY] = "Core not capable of performing SBAF currently",
 427         [IFS_SBAF_UNASSIGNED_ERROR_CODE7] = "Unassigned error code 0x7",
 428         [IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT] = "Exceeded number of Logical Processors (LP) allowed to run Scan-At-Field concurrently",
 429         [IFS_SBAF_INTERRUPTED_DURING_EXECUTION] = "Interrupt occurred prior to SBAF start",
 430         [IFS_SBAF_INVALID_PROGRAM_INDEX] = "SBAF program index not valid",
 431         [IFS_SBAF_CORRUPTED_CHUNK] = "SBAF operation aborted due to corrupted chunk",
 432         [IFS_SBAF_DID_NOT_START] = "SBAF operation did not start",
 433 };
 434
 435 static void sbaf_message_not_tested(struct device *dev, int cpu, u64 status_data)
 436 {
 437         union ifs_sbaf_status status = (union ifs_sbaf_status)status_data;
 438
 439         if (status.error_code < ARRAY_SIZE(sbaf_test_status)) {
 440                 dev_info(dev, "CPU(s) %*pbl: SBAF operation did not start. %s\n",
 441                          cpumask_pr_args(cpu_smt_mask(cpu)),
 442                          sbaf_test_status[status.error_code]);
 443         } else if (status.error_code == IFS_SW_TIMEOUT) {
 444                 dev_info(dev, "CPU(s) %*pbl: software timeout during scan\n",
 445                          cpumask_pr_args(cpu_smt_mask(cpu)));
 446         } else if (status.error_code == IFS_SW_PARTIAL_COMPLETION) {
 447                 dev_info(dev, "CPU(s) %*pbl: %s\n",
 448                          cpumask_pr_args(cpu_smt_mask(cpu)),
 449                          "Not all SBAF bundles executed. Maximum forward progress retries exceeded");
 450         } else {
 451                 dev_info(dev, "CPU(s) %*pbl: SBAF unknown status %llx\n",
 452                          cpumask_pr_args(cpu_smt_mask(cpu)), status.data);
 453         }
 454 }
 455
 456 static void sbaf_message_fail(struct device *dev, int cpu, union ifs_sbaf_status status)
 457 {
 458         /* Failed signature check is set when SBAF signature did not match the expected value */
 459         if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL) {
 460                 dev_err(dev, "CPU(s) %*pbl: Failed signature check\n",
 461                         cpumask_pr_args(cpu_smt_mask(cpu)));
 462         }
 463
 464         /* Failed to reach end of test */
 465         if (status.sbaf_status == SBAF_STATUS_TEST_FAIL) {
 466                 dev_err(dev, "CPU(s) %*pbl: Failed to complete test\n",
 467                         cpumask_pr_args(cpu_smt_mask(cpu)));
 468         }
 469 }
 470
 471 static bool sbaf_bundle_completed(union ifs_sbaf_status status)
 472 {
 473         return !(status.sbaf_status || status.error_code);
 474 }
 475
 476 static bool sbaf_can_restart(union ifs_sbaf_status status)
 477 {
 478         enum sbaf_status_err_code err_code = status.error_code;
 479
 480         /* Signature for chunk is bad, or scan test failed */
 481         if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL ||
 482             status.sbaf_status == SBAF_STATUS_TEST_FAIL)
 483                 return false;
 484
 485         switch (err_code) {
 486         case IFS_SBAF_NO_ERROR:
 487         case IFS_SBAF_OTHER_THREAD_COULD_NOT_JOIN:
 488         case IFS_SBAF_INTERRUPTED_BEFORE_RENDEZVOUS:
 489         case IFS_SBAF_EXCEED_NUMBER_OF_THREADS_CONCURRENT:
 490         case IFS_SBAF_INTERRUPTED_DURING_EXECUTION:
 491                 return true;
 492         case IFS_SBAF_UNASSIGNED_ERROR_CODE3:
 493         case IFS_SBAF_INVALID_BUNDLE_INDEX:
 494         case IFS_SBAF_MISMATCH_ARGS_BETWEEN_THREADS:
 495         case IFS_SBAF_CORE_NOT_CAPABLE_CURRENTLY:
 496         case IFS_SBAF_UNASSIGNED_ERROR_CODE7:
 497         case IFS_SBAF_INVALID_PROGRAM_INDEX:
 498         case IFS_SBAF_CORRUPTED_CHUNK:
 499         case IFS_SBAF_DID_NOT_START:
 500                 break;
 501         }
 502         return false;
 503 }
 504
 505 /*
 506  * Execute the SBAF test. Called "simultaneously" on all threads of a core
 507  * at high priority using the stop_cpus mechanism.
 508  */
 509 static int dosbaf(void *data)
 510 {
 511         struct sbaf_run_params *run_params = data;
 512         int cpu = smp_processor_id();
 513         union ifs_sbaf_status status;
 514         struct ifs_data *ifsd;
 515         int first;
 516
 517         ifsd = run_params->ifsd;
 518
 519         /* Only the first logical CPU on a core reports result */
 520         first = cpumask_first(cpu_smt_mask(cpu));
 521         wait_for_sibling_cpu(&sbaf_cpus_in, NSEC_PER_SEC);
 522
 523         /*
 524          * This WRMSR will wait for other HT threads to also write
 525          * to this MSR (at most for activate.delay cycles). Then it
 526          * starts scan of each requested bundle. The core test happens
 527          * during the "execution" of the WRMSR.
 528          */
 529         wrmsrl(MSR_ACTIVATE_SBAF, run_params->activate->data);
 530         rdmsrl(MSR_SBAF_STATUS, status.data);
 531         trace_ifs_sbaf(ifsd->cur_batch, *run_params->activate, status);
 532
 533         /* Pass back the result of the test */
 534         if (cpu == first)
 535                 run_params->status = status;
 536
 537         return 0;
 538 }
 539
 540 static void ifs_sbaf_test_core(int cpu, struct device *dev)
 541 {
 542         struct sbaf_run_params run_params;
 543         union ifs_sbaf_status status = {};
 544         union ifs_sbaf activate;
 545         unsigned long timeout;
 546         struct ifs_data *ifsd;
 547         int stop_bundle;
 548         int retries;
 549
 550         ifsd = ifs_get_data(dev);
 551
 552         activate.data = 0;
 553         activate.delay = IFS_THREAD_WAIT;
 554
 555         timeout = jiffies + 2 * HZ;
 556         retries = MAX_IFS_RETRIES;
 557         activate.bundle_idx = 0;
 558         stop_bundle = ifsd->max_bundle;
 559
 560         while (activate.bundle_idx <= stop_bundle) {
 561                 if (time_after(jiffies, timeout)) {
 562                         status.error_code = IFS_SW_TIMEOUT;
 563                         break;
 564                 }
 565
 566                 atomic_set(&sbaf_cpus_in, 0);
 567
 568                 run_params.ifsd = ifsd;
 569                 run_params.activate = &activate;
 570                 run_params.retry_cnt = &retries;
 571                 stop_core_cpuslocked(cpu, dosbaf, &run_params);
 572
 573                 status = run_params.status;
 574
 575                 if (sbaf_bundle_completed(status)) {
 576                         activate.bundle_idx = status.bundle_idx + 1;
 577                         activate.pgm_idx = 0;
 578                         retries = MAX_IFS_RETRIES;
 579                         continue;
 580                 }
 581
 582                 /* Some cases can be retried, give up for others */
 583                 if (!sbaf_can_restart(status))
 584                         break;
 585
 586                 if (status.pgm_idx == activate.pgm_idx) {
 587                         /* If no progress retry */
 588                         if (--retries == 0) {
 589                                 if (status.error_code == IFS_NO_ERROR)
 590                                         status.error_code = IFS_SW_PARTIAL_COMPLETION;
 591                                 break;
 592                         }
 593                 } else {
 594                         /* if some progress, more pgms remaining in bundle, reset retries */
 595                         retries = MAX_IFS_RETRIES;
 596                         activate.bundle_idx = status.bundle_idx;
 597                         activate.pgm_idx = status.pgm_idx;
 598                 }
 599         }
 600
 601         /* Update status for this core */
 602         ifsd->scan_details = status.data;
 603
 604         if (status.sbaf_status == SBAF_STATUS_SIGN_FAIL ||
 605             status.sbaf_status == SBAF_STATUS_TEST_FAIL) {
 606                 ifsd->status = SCAN_TEST_FAIL;
 607                 sbaf_message_fail(dev, cpu, status);
 608         } else if (status.error_code || status.sbaf_status == SBAF_STATUS_INTR ||
 609                    (activate.bundle_idx < stop_bundle)) {
 610                 ifsd->status = SCAN_NOT_TESTED;
 611                 sbaf_message_not_tested(dev, cpu, status.data);
 612         } else {
 613                 ifsd->status = SCAN_TEST_PASS;
 614         }
 615 }
 616
 617 /*
 618  * Initiate per core test. It wakes up work queue threads on the target cpu and
 619  * its sibling cpu. Once all sibling threads wake up, the scan test gets executed and
 620  * wait for all sibling threads to finish the scan test.
 621  */
 622 int do_core_test(int cpu, struct device *dev)
 623 {
 624         const struct ifs_test_caps *test = ifs_get_test_caps(dev);
 625         struct ifs_data *ifsd = ifs_get_data(dev);
 626         int ret = 0;
 627
 628         /* Prevent CPUs from being taken offline during the scan test */
 629         cpus_read_lock();
 630
 631         if (!cpu_online(cpu)) {
 632                 dev_info(dev, "cannot test on the offline cpu %d\n", cpu);
 633                 ret = -EINVAL;
 634                 goto out;
 635         }
 636
 637         switch (test->test_num) {
 638         case IFS_TYPE_SAF:
 639                 if (!ifsd->loaded)
 640                         ret = -EPERM;
 641                 else
 642                         ifs_test_core(cpu, dev);
 643                 break;
 644         case IFS_TYPE_ARRAY_BIST:
 645                 if (ifsd->array_gen == ARRAY_GEN0)
 646                         ifs_array_test_core(cpu, dev);
 647                 else
 648                         ifs_array_test_gen1(cpu, dev);
 649                 break;
 650         case IFS_TYPE_SBAF:
 651                 if (!ifsd->loaded)
 652                         ret = -EPERM;
 653                 else
 654                         ifs_sbaf_test_core(cpu, dev);
 655                 break;
 656         default:
 657                 ret = -EINVAL;
 658         }
 659 out:
 660         cpus_read_unlock();
 661         return ret;
 662 }