drivers/gpu/drm/i915/gt/selftest_engine_cs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright © 2018 Intel Corporation
   4  */
   5
   6 #include <linux/sort.h>
   7
   8 #include "intel_gpu_commands.h"
   9 #include "intel_gt_pm.h"
  10 #include "intel_rps.h"
  11
  12 #include "i915_selftest.h"
  13 #include "selftests/igt_flush_test.h"
  14
  15 #define COUNT 5
  16
  17 static int cmp_u32(const void *A, const void *B)
  18 {
  19         const u32 *a = A, *b = B;
  20
  21         return *a - *b;
  22 }
  23
  24 static void perf_begin(struct intel_gt *gt)
  25 {
  26         intel_gt_pm_get(gt);
  27
  28         /* Boost gpufreq to max [waitboost] and keep it fixed */
  29         atomic_inc(&gt->rps.num_waiters);
  30         schedule_work(&gt->rps.work);
  31         flush_work(&gt->rps.work);
  32 }
  33
  34 static int perf_end(struct intel_gt *gt)
  35 {
  36         atomic_dec(&gt->rps.num_waiters);
  37         intel_gt_pm_put(gt);
  38
  39         return igt_flush_test(gt->i915);
  40 }
  41
  42 static int write_timestamp(struct i915_request *rq, int slot)
  43 {
  44         struct intel_timeline *tl =
  45                 rcu_dereference_protected(rq->timeline,
  46                                           !i915_request_signaled(rq));
  47         u32 cmd;
  48         u32 *cs;
  49
  50         cs = intel_ring_begin(rq, 4);
  51         if (IS_ERR(cs))
  52                 return PTR_ERR(cs);
  53
  54         cmd = MI_STORE_REGISTER_MEM | MI_USE_GGTT;
  55         if (GRAPHICS_VER(rq->engine->i915) >= 8)
  56                 cmd++;
  57         *cs++ = cmd;
  58         *cs++ = i915_mmio_reg_offset(RING_TIMESTAMP(rq->engine->mmio_base));
  59         *cs++ = tl->hwsp_offset + slot * sizeof(u32);
  60         *cs++ = 0;
  61
  62         intel_ring_advance(rq, cs);
  63
  64         return 0;
  65 }
  66
  67 static struct i915_vma *create_empty_batch(struct intel_context *ce)
  68 {
  69         struct drm_i915_gem_object *obj;
  70         struct i915_vma *vma;
  71         u32 *cs;
  72         int err;
  73
  74         obj = i915_gem_object_create_internal(ce->engine->i915, PAGE_SIZE);
  75         if (IS_ERR(obj))
  76                 return ERR_CAST(obj);
  77
  78         cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
  79         if (IS_ERR(cs)) {
  80                 err = PTR_ERR(cs);
  81                 goto err_put;
  82         }
  83
  84         cs[0] = MI_BATCH_BUFFER_END;
  85
  86         i915_gem_object_flush_map(obj);
  87
  88         vma = i915_vma_instance(obj, ce->vm, NULL);
  89         if (IS_ERR(vma)) {
  90                 err = PTR_ERR(vma);
  91                 goto err_unpin;
  92         }
  93
  94         err = i915_vma_pin(vma, 0, 0, PIN_USER);
  95         if (err)
  96                 goto err_unpin;
  97
  98         i915_gem_object_unpin_map(obj);
  99         return vma;
 100
 101 err_unpin:
 102         i915_gem_object_unpin_map(obj);
 103 err_put:
 104         i915_gem_object_put(obj);
 105         return ERR_PTR(err);
 106 }
 107
 108 static u32 trifilter(u32 *a)
 109 {
 110         u64 sum;
 111
 112         sort(a, COUNT, sizeof(*a), cmp_u32, NULL);
 113
 114         sum = mul_u32_u32(a[2], 2);
 115         sum += a[1];
 116         sum += a[3];
 117
 118         return sum >> 2;
 119 }
 120
 121 static int perf_mi_bb_start(void *arg)
 122 {
 123         struct intel_gt *gt = arg;
 124         struct intel_engine_cs *engine;
 125         enum intel_engine_id id;
 126         int err = 0;
 127
 128         if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
 129                 return 0;
 130
 131         perf_begin(gt);
 132         for_each_engine(engine, gt, id) {
 133                 struct intel_context *ce = engine->kernel_context;
 134                 struct i915_vma *batch;
 135                 u32 cycles[COUNT];
 136                 int i;
 137
 138                 intel_engine_pm_get(engine);
 139
 140                 batch = create_empty_batch(ce);
 141                 if (IS_ERR(batch)) {
 142                         err = PTR_ERR(batch);
 143                         intel_engine_pm_put(engine);
 144                         break;
 145                 }
 146
 147                 err = i915_vma_sync(batch);
 148                 if (err) {
 149                         intel_engine_pm_put(engine);
 150                         i915_vma_put(batch);
 151                         break;
 152                 }
 153
 154                 for (i = 0; i < ARRAY_SIZE(cycles); i++) {
 155                         struct i915_request *rq;
 156
 157                         rq = i915_request_create(ce);
 158                         if (IS_ERR(rq)) {
 159                                 err = PTR_ERR(rq);
 160                                 break;
 161                         }
 162
 163                         err = write_timestamp(rq, 2);
 164                         if (err)
 165                                 goto out;
 166
 167                         err = rq->engine->emit_bb_start(rq,
 168                                                         batch->node.start, 8,
 169                                                         0);
 170                         if (err)
 171                                 goto out;
 172
 173                         err = write_timestamp(rq, 3);
 174                         if (err)
 175                                 goto out;
 176
 177 out:
 178                         i915_request_get(rq);
 179                         i915_request_add(rq);
 180
 181                         if (i915_request_wait(rq, 0, HZ / 5) < 0)
 182                                 err = -EIO;
 183                         i915_request_put(rq);
 184                         if (err)
 185                                 break;
 186
 187                         cycles[i] = rq->hwsp_seqno[3] - rq->hwsp_seqno[2];
 188                 }
 189                 i915_vma_put(batch);
 190                 intel_engine_pm_put(engine);
 191                 if (err)
 192                         break;
 193
 194                 pr_info("%s: MI_BB_START cycles: %u\n",
 195                         engine->name, trifilter(cycles));
 196         }
 197         if (perf_end(gt))
 198                 err = -EIO;
 199
 200         return err;
 201 }
 202
 203 static struct i915_vma *create_nop_batch(struct intel_context *ce)
 204 {
 205         struct drm_i915_gem_object *obj;
 206         struct i915_vma *vma;
 207         u32 *cs;
 208         int err;
 209
 210         obj = i915_gem_object_create_internal(ce->engine->i915, SZ_64K);
 211         if (IS_ERR(obj))
 212                 return ERR_CAST(obj);
 213
 214         cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
 215         if (IS_ERR(cs)) {
 216                 err = PTR_ERR(cs);
 217                 goto err_put;
 218         }
 219
 220         memset(cs, 0, SZ_64K);
 221         cs[SZ_64K / sizeof(*cs) - 1] = MI_BATCH_BUFFER_END;
 222
 223         i915_gem_object_flush_map(obj);
 224
 225         vma = i915_vma_instance(obj, ce->vm, NULL);
 226         if (IS_ERR(vma)) {
 227                 err = PTR_ERR(vma);
 228                 goto err_unpin;
 229         }
 230
 231         err = i915_vma_pin(vma, 0, 0, PIN_USER);
 232         if (err)
 233                 goto err_unpin;
 234
 235         i915_gem_object_unpin_map(obj);
 236         return vma;
 237
 238 err_unpin:
 239         i915_gem_object_unpin_map(obj);
 240 err_put:
 241         i915_gem_object_put(obj);
 242         return ERR_PTR(err);
 243 }
 244
 245 static int perf_mi_noop(void *arg)
 246 {
 247         struct intel_gt *gt = arg;
 248         struct intel_engine_cs *engine;
 249         enum intel_engine_id id;
 250         int err = 0;
 251
 252         if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
 253                 return 0;
 254
 255         perf_begin(gt);
 256         for_each_engine(engine, gt, id) {
 257                 struct intel_context *ce = engine->kernel_context;
 258                 struct i915_vma *base, *nop;
 259                 u32 cycles[COUNT];
 260                 int i;
 261
 262                 intel_engine_pm_get(engine);
 263
 264                 base = create_empty_batch(ce);
 265                 if (IS_ERR(base)) {
 266                         err = PTR_ERR(base);
 267                         intel_engine_pm_put(engine);
 268                         break;
 269                 }
 270
 271                 err = i915_vma_sync(base);
 272                 if (err) {
 273                         i915_vma_put(base);
 274                         intel_engine_pm_put(engine);
 275                         break;
 276                 }
 277
 278                 nop = create_nop_batch(ce);
 279                 if (IS_ERR(nop)) {
 280                         err = PTR_ERR(nop);
 281                         i915_vma_put(base);
 282                         intel_engine_pm_put(engine);
 283                         break;
 284                 }
 285
 286                 err = i915_vma_sync(nop);
 287                 if (err) {
 288                         i915_vma_put(nop);
 289                         i915_vma_put(base);
 290                         intel_engine_pm_put(engine);
 291                         break;
 292                 }
 293
 294                 for (i = 0; i < ARRAY_SIZE(cycles); i++) {
 295                         struct i915_request *rq;
 296
 297                         rq = i915_request_create(ce);
 298                         if (IS_ERR(rq)) {
 299                                 err = PTR_ERR(rq);
 300                                 break;
 301                         }
 302
 303                         err = write_timestamp(rq, 2);
 304                         if (err)
 305                                 goto out;
 306
 307                         err = rq->engine->emit_bb_start(rq,
 308                                                         base->node.start, 8,
 309                                                         0);
 310                         if (err)
 311                                 goto out;
 312
 313                         err = write_timestamp(rq, 3);
 314                         if (err)
 315                                 goto out;
 316
 317                         err = rq->engine->emit_bb_start(rq,
 318                                                         nop->node.start,
 319                                                         nop->node.size,
 320                                                         0);
 321                         if (err)
 322                                 goto out;
 323
 324                         err = write_timestamp(rq, 4);
 325                         if (err)
 326                                 goto out;
 327
 328 out:
 329                         i915_request_get(rq);
 330                         i915_request_add(rq);
 331
 332                         if (i915_request_wait(rq, 0, HZ / 5) < 0)
 333                                 err = -EIO;
 334                         i915_request_put(rq);
 335                         if (err)
 336                                 break;
 337
 338                         cycles[i] =
 339                                 (rq->hwsp_seqno[4] - rq->hwsp_seqno[3]) -
 340                                 (rq->hwsp_seqno[3] - rq->hwsp_seqno[2]);
 341                 }
 342                 i915_vma_put(nop);
 343                 i915_vma_put(base);
 344                 intel_engine_pm_put(engine);
 345                 if (err)
 346                         break;
 347
 348                 pr_info("%s: 16K MI_NOOP cycles: %u\n",
 349                         engine->name, trifilter(cycles));
 350         }
 351         if (perf_end(gt))
 352                 err = -EIO;
 353
 354         return err;
 355 }
 356
 357 int intel_engine_cs_perf_selftests(struct drm_i915_private *i915)
 358 {
 359         static const struct i915_subtest tests[] = {
 360                 SUBTEST(perf_mi_bb_start),
 361                 SUBTEST(perf_mi_noop),
 362         };
 363
 364         if (intel_gt_is_wedged(&i915->gt))
 365                 return 0;
 366
 367         return intel_gt_live_subtests(tests, &i915->gt);
 368 }
 369
 370 static int intel_mmio_bases_check(void *arg)
 371 {
 372         int i, j;
 373
 374         for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
 375                 const struct engine_info *info = &intel_engines[i];
 376                 u8 prev = U8_MAX;
 377
 378                 for (j = 0; j < MAX_MMIO_BASES; j++) {
 379                         u8 ver = info->mmio_bases[j].graphics_ver;
 380                         u32 base = info->mmio_bases[j].base;
 381
 382                         if (ver >= prev) {
 383                                 pr_err("%s(%s, class:%d, instance:%d): mmio base for graphics ver %u is before the one for ver %u\n",
 384                                        __func__,
 385                                        intel_engine_class_repr(info->class),
 386                                        info->class, info->instance,
 387                                        prev, ver);
 388                                 return -EINVAL;
 389                         }
 390
 391                         if (ver == 0)
 392                                 break;
 393
 394                         if (!base) {
 395                                 pr_err("%s(%s, class:%d, instance:%d): invalid mmio base (%x) for graphics ver %u at entry %u\n",
 396                                        __func__,
 397                                        intel_engine_class_repr(info->class),
 398                                        info->class, info->instance,
 399                                        base, ver, j);
 400                                 return -EINVAL;
 401                         }
 402
 403                         prev = ver;
 404                 }
 405
 406                 pr_debug("%s: min graphics version supported for %s%d is %u\n",
 407                          __func__,
 408                          intel_engine_class_repr(info->class),
 409                          info->instance,
 410                          prev);
 411         }
 412
 413         return 0;
 414 }
 415
 416 int intel_engine_cs_mock_selftests(void)
 417 {
 418         static const struct i915_subtest tests[] = {
 419                 SUBTEST(intel_mmio_bases_check),
 420         };
 421
 422         return i915_subtests(tests, NULL);
 423 }