1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include "gt/intel_engine_pm.h" 7 #include "gt/intel_gpu_commands.h" 8 #include "i915_selftest.h" 9 10 #include "gem/selftests/mock_context.h" 11 #include "selftests/igt_reset.h" 12 #include "selftests/igt_spinner.h" 13 #include "selftests/intel_scheduler_helpers.h" 14 15 struct live_mocs { 16 struct drm_i915_mocs_table table; 17 struct drm_i915_mocs_table *mocs; 18 struct drm_i915_mocs_table *l3cc; 19 struct i915_vma *scratch; 20 void *vaddr; 21 }; 22 23 static struct intel_context *mocs_context_create(struct intel_engine_cs *engine) 24 { 25 struct intel_context *ce; 26 27 ce = intel_context_create(engine); 28 if (IS_ERR(ce)) 29 return ce; 30 31 /* We build large requests to read the registers from the ring */ 32 ce->ring_size = SZ_16K; 33 34 return ce; 35 } 36 37 static int request_add_sync(struct i915_request *rq, int err) 38 { 39 i915_request_get(rq); 40 i915_request_add(rq); 41 if (i915_request_wait(rq, 0, HZ / 5) < 0) 42 err = -ETIME; 43 i915_request_put(rq); 44 45 return err; 46 } 47 48 static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin) 49 { 50 int err = 0; 51 52 i915_request_get(rq); 53 i915_request_add(rq); 54 if (spin && !igt_wait_for_spinner(spin, rq)) 55 err = -ETIME; 56 i915_request_put(rq); 57 58 return err; 59 } 60 61 static int live_mocs_init(struct live_mocs *arg, struct intel_gt *gt) 62 { 63 unsigned int flags; 64 int err; 65 66 memset(arg, 0, sizeof(*arg)); 67 68 flags = get_mocs_settings(gt->i915, &arg->table); 69 if (!flags) 70 return -EINVAL; 71 72 if (flags & HAS_RENDER_L3CC) 73 arg->l3cc = &arg->table; 74 75 if (flags & (HAS_GLOBAL_MOCS | HAS_ENGINE_MOCS)) 76 arg->mocs = &arg->table; 77 78 arg->scratch = 79 __vm_create_scratch_for_read_pinned(>->ggtt->vm, PAGE_SIZE); 80 if (IS_ERR(arg->scratch)) 81 return PTR_ERR(arg->scratch); 82 83 arg->vaddr = i915_gem_object_pin_map_unlocked(arg->scratch->obj, I915_MAP_WB); 84 if (IS_ERR(arg->vaddr)) { 85 err = PTR_ERR(arg->vaddr); 86 goto err_scratch; 87 } 88 89 return 0; 90 91 err_scratch: 92 i915_vma_unpin_and_release(&arg->scratch, 0); 93 return err; 94 } 95 96 static void live_mocs_fini(struct live_mocs *arg) 97 { 98 i915_vma_unpin_and_release(&arg->scratch, I915_VMA_RELEASE_MAP); 99 } 100 101 static int read_regs(struct i915_request *rq, 102 u32 addr, unsigned int count, 103 u32 *offset) 104 { 105 unsigned int i; 106 u32 *cs; 107 108 GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32))); 109 110 cs = intel_ring_begin(rq, 4 * count); 111 if (IS_ERR(cs)) 112 return PTR_ERR(cs); 113 114 for (i = 0; i < count; i++) { 115 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT; 116 *cs++ = addr; 117 *cs++ = *offset; 118 *cs++ = 0; 119 120 addr += sizeof(u32); 121 *offset += sizeof(u32); 122 } 123 124 intel_ring_advance(rq, cs); 125 126 return 0; 127 } 128 129 static int read_mocs_table(struct i915_request *rq, 130 const struct drm_i915_mocs_table *table, 131 u32 *offset) 132 { 133 u32 addr; 134 135 if (!table) 136 return 0; 137 138 if (HAS_GLOBAL_MOCS_REGISTERS(rq->engine->i915)) 139 addr = global_mocs_offset(); 140 else 141 addr = mocs_offset(rq->engine); 142 143 return read_regs(rq, addr, table->n_entries, offset); 144 } 145 146 static int read_l3cc_table(struct i915_request *rq, 147 const struct drm_i915_mocs_table *table, 148 u32 *offset) 149 { 150 u32 addr = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0)); 151 152 if (!table) 153 return 0; 154 155 return read_regs(rq, addr, (table->n_entries + 1) / 2, offset); 156 } 157 158 static int check_mocs_table(struct intel_engine_cs *engine, 159 const struct drm_i915_mocs_table *table, 160 u32 **vaddr) 161 { 162 unsigned int i; 163 u32 expect; 164 165 if (!table) 166 return 0; 167 168 for_each_mocs(expect, table, i) { 169 if (**vaddr != expect) { 170 pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n", 171 engine->name, i, **vaddr, expect); 172 return -EINVAL; 173 } 174 ++*vaddr; 175 } 176 177 return 0; 178 } 179 180 static bool mcr_range(struct drm_i915_private *i915, u32 offset) 181 { 182 /* 183 * Registers in this range are affected by the MCR selector 184 * which only controls CPU initiated MMIO. Routing does not 185 * work for CS access so we cannot verify them on this path. 186 */ 187 return GRAPHICS_VER(i915) >= 8 && offset >= 0xb000 && offset <= 0xb4ff; 188 } 189 190 static int check_l3cc_table(struct intel_engine_cs *engine, 191 const struct drm_i915_mocs_table *table, 192 u32 **vaddr) 193 { 194 /* Can we read the MCR range 0xb00 directly? See intel_workarounds! */ 195 u32 reg = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0)); 196 unsigned int i; 197 u32 expect; 198 199 if (!table) 200 return 0; 201 202 for_each_l3cc(expect, table, i) { 203 if (!mcr_range(engine->i915, reg) && **vaddr != expect) { 204 pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n", 205 engine->name, i, **vaddr, expect); 206 return -EINVAL; 207 } 208 ++*vaddr; 209 reg += 4; 210 } 211 212 return 0; 213 } 214 215 static int check_mocs_engine(struct live_mocs *arg, 216 struct intel_context *ce) 217 { 218 struct i915_vma *vma = arg->scratch; 219 struct i915_request *rq; 220 u32 offset; 221 u32 *vaddr; 222 int err; 223 224 memset32(arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32)); 225 226 rq = intel_context_create_request(ce); 227 if (IS_ERR(rq)) 228 return PTR_ERR(rq); 229 230 i915_vma_lock(vma); 231 err = i915_request_await_object(rq, vma->obj, true); 232 if (!err) 233 err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE); 234 i915_vma_unlock(vma); 235 236 /* Read the mocs tables back using SRM */ 237 offset = i915_ggtt_offset(vma); 238 if (!err) 239 err = read_mocs_table(rq, arg->mocs, &offset); 240 if (!err && ce->engine->class == RENDER_CLASS) 241 err = read_l3cc_table(rq, arg->l3cc, &offset); 242 offset -= i915_ggtt_offset(vma); 243 GEM_BUG_ON(offset > PAGE_SIZE); 244 245 err = request_add_sync(rq, err); 246 if (err) 247 return err; 248 249 /* Compare the results against the expected tables */ 250 vaddr = arg->vaddr; 251 if (!err) 252 err = check_mocs_table(ce->engine, arg->mocs, &vaddr); 253 if (!err && ce->engine->class == RENDER_CLASS) 254 err = check_l3cc_table(ce->engine, arg->l3cc, &vaddr); 255 if (err) 256 return err; 257 258 GEM_BUG_ON(arg->vaddr + offset != vaddr); 259 return 0; 260 } 261 262 static int live_mocs_kernel(void *arg) 263 { 264 struct intel_gt *gt = arg; 265 struct intel_engine_cs *engine; 266 enum intel_engine_id id; 267 struct live_mocs mocs; 268 int err; 269 270 /* Basic check the system is configured with the expected mocs table */ 271 272 err = live_mocs_init(&mocs, gt); 273 if (err) 274 return err; 275 276 for_each_engine(engine, gt, id) { 277 intel_engine_pm_get(engine); 278 err = check_mocs_engine(&mocs, engine->kernel_context); 279 intel_engine_pm_put(engine); 280 if (err) 281 break; 282 } 283 284 live_mocs_fini(&mocs); 285 return err; 286 } 287 288 static int live_mocs_clean(void *arg) 289 { 290 struct intel_gt *gt = arg; 291 struct intel_engine_cs *engine; 292 enum intel_engine_id id; 293 struct live_mocs mocs; 294 int err; 295 296 /* Every new context should see the same mocs table */ 297 298 err = live_mocs_init(&mocs, gt); 299 if (err) 300 return err; 301 302 for_each_engine(engine, gt, id) { 303 struct intel_context *ce; 304 305 ce = mocs_context_create(engine); 306 if (IS_ERR(ce)) { 307 err = PTR_ERR(ce); 308 break; 309 } 310 311 err = check_mocs_engine(&mocs, ce); 312 intel_context_put(ce); 313 if (err) 314 break; 315 } 316 317 live_mocs_fini(&mocs); 318 return err; 319 } 320 321 static int active_engine_reset(struct intel_context *ce, 322 const char *reason, 323 bool using_guc) 324 { 325 struct igt_spinner spin; 326 struct i915_request *rq; 327 int err; 328 329 err = igt_spinner_init(&spin, ce->engine->gt); 330 if (err) 331 return err; 332 333 rq = igt_spinner_create_request(&spin, ce, MI_NOOP); 334 if (IS_ERR(rq)) { 335 igt_spinner_fini(&spin); 336 return PTR_ERR(rq); 337 } 338 339 err = request_add_spin(rq, &spin); 340 if (err == 0 && !using_guc) 341 err = intel_engine_reset(ce->engine, reason); 342 343 /* Ensure the reset happens and kills the engine */ 344 if (err == 0) 345 err = intel_selftest_wait_for_rq(rq); 346 347 igt_spinner_end(&spin); 348 igt_spinner_fini(&spin); 349 350 return err; 351 } 352 353 static int __live_mocs_reset(struct live_mocs *mocs, 354 struct intel_context *ce, bool using_guc) 355 { 356 struct intel_gt *gt = ce->engine->gt; 357 int err; 358 359 if (intel_has_reset_engine(gt)) { 360 if (!using_guc) { 361 err = intel_engine_reset(ce->engine, "mocs"); 362 if (err) 363 return err; 364 365 err = check_mocs_engine(mocs, ce); 366 if (err) 367 return err; 368 } 369 370 err = active_engine_reset(ce, "mocs", using_guc); 371 if (err) 372 return err; 373 374 err = check_mocs_engine(mocs, ce); 375 if (err) 376 return err; 377 } 378 379 if (intel_has_gpu_reset(gt)) { 380 intel_gt_reset(gt, ce->engine->mask, "mocs"); 381 382 err = check_mocs_engine(mocs, ce); 383 if (err) 384 return err; 385 } 386 387 return 0; 388 } 389 390 static int live_mocs_reset(void *arg) 391 { 392 struct intel_gt *gt = arg; 393 struct intel_engine_cs *engine; 394 enum intel_engine_id id; 395 struct live_mocs mocs; 396 int err = 0; 397 398 /* Check the mocs setup is retained over per-engine and global resets */ 399 400 err = live_mocs_init(&mocs, gt); 401 if (err) 402 return err; 403 404 igt_global_reset_lock(gt); 405 for_each_engine(engine, gt, id) { 406 bool using_guc = intel_engine_uses_guc(engine); 407 struct intel_selftest_saved_policy saved; 408 struct intel_context *ce; 409 int err2; 410 411 err = intel_selftest_modify_policy(engine, &saved, 412 SELFTEST_SCHEDULER_MODIFY_FAST_RESET); 413 if (err) 414 break; 415 416 ce = mocs_context_create(engine); 417 if (IS_ERR(ce)) { 418 err = PTR_ERR(ce); 419 goto restore; 420 } 421 422 intel_engine_pm_get(engine); 423 424 err = __live_mocs_reset(&mocs, ce, using_guc); 425 426 intel_engine_pm_put(engine); 427 intel_context_put(ce); 428 429 restore: 430 err2 = intel_selftest_restore_policy(engine, &saved); 431 if (err == 0) 432 err = err2; 433 if (err) 434 break; 435 } 436 igt_global_reset_unlock(gt); 437 438 live_mocs_fini(&mocs); 439 return err; 440 } 441 442 int intel_mocs_live_selftests(struct drm_i915_private *i915) 443 { 444 static const struct i915_subtest tests[] = { 445 SUBTEST(live_mocs_kernel), 446 SUBTEST(live_mocs_clean), 447 SUBTEST(live_mocs_reset), 448 }; 449 struct drm_i915_mocs_table table; 450 451 if (!get_mocs_settings(i915, &table)) 452 return 0; 453 454 return intel_gt_live_subtests(tests, to_gt(i915)); 455 } 456