1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include <linux/prandom.h> 7 8 #include <uapi/drm/i915_drm.h> 9 10 #include "intel_memory_region.h" 11 #include "i915_drv.h" 12 #include "i915_ttm_buddy_manager.h" 13 14 static const struct { 15 u16 class; 16 u16 instance; 17 } intel_region_map[] = { 18 [INTEL_REGION_SMEM] = { 19 .class = INTEL_MEMORY_SYSTEM, 20 .instance = 0, 21 }, 22 [INTEL_REGION_LMEM_0] = { 23 .class = INTEL_MEMORY_LOCAL, 24 .instance = 0, 25 }, 26 [INTEL_REGION_STOLEN_SMEM] = { 27 .class = INTEL_MEMORY_STOLEN_SYSTEM, 28 .instance = 0, 29 }, 30 [INTEL_REGION_STOLEN_LMEM] = { 31 .class = INTEL_MEMORY_STOLEN_LOCAL, 32 .instance = 0, 33 }, 34 }; 35 36 static int __iopagetest(struct intel_memory_region *mem, 37 u8 __iomem *va, int pagesize, 38 u8 value, resource_size_t offset, 39 const void *caller) 40 { 41 int byte = get_random_u32_below(pagesize); 42 u8 result[3]; 43 44 memset_io(va, value, pagesize); /* or GPF! */ 45 wmb(); 46 47 result[0] = ioread8(va); 48 result[1] = ioread8(va + byte); 49 result[2] = ioread8(va + pagesize - 1); 50 if (memchr_inv(result, value, sizeof(result))) { 51 dev_err(mem->i915->drm.dev, 52 "Failed to read back from memory region:%pR at [%pa + %pa] for %ps; wrote %x, read (%x, %x, %x)\n", 53 &mem->region, &mem->io_start, &offset, caller, 54 value, result[0], result[1], result[2]); 55 return -EINVAL; 56 } 57 58 return 0; 59 } 60 61 static int iopagetest(struct intel_memory_region *mem, 62 resource_size_t offset, 63 const void *caller) 64 { 65 const u8 val[] = { 0x0, 0xa5, 0xc3, 0xf0 }; 66 void __iomem *va; 67 int err; 68 int i; 69 70 va = ioremap_wc(mem->io_start + offset, PAGE_SIZE); 71 if (!va) { 72 dev_err(mem->i915->drm.dev, 73 "Failed to ioremap memory region [%pa + %pa] for %ps\n", 74 &mem->io_start, &offset, caller); 75 return -EFAULT; 76 } 77 78 for (i = 0; i < ARRAY_SIZE(val); i++) { 79 err = __iopagetest(mem, va, PAGE_SIZE, val[i], offset, caller); 80 if (err) 81 break; 82 83 err = __iopagetest(mem, va, PAGE_SIZE, ~val[i], offset, caller); 84 if (err) 85 break; 86 } 87 88 iounmap(va); 89 return err; 90 } 91 92 static resource_size_t random_page(resource_size_t last) 93 { 94 /* Limited to low 44b (16TiB), but should suffice for a spot check */ 95 return get_random_u32_below(last >> PAGE_SHIFT) << PAGE_SHIFT; 96 } 97 98 static int iomemtest(struct intel_memory_region *mem, 99 bool test_all, 100 const void *caller) 101 { 102 resource_size_t last, page; 103 int err; 104 105 if (mem->io_size < PAGE_SIZE) 106 return 0; 107 108 last = mem->io_size - PAGE_SIZE; 109 110 /* 111 * Quick test to check read/write access to the iomap (backing store). 112 * 113 * Write a byte, read it back. If the iomapping fails, we expect 114 * a GPF preventing further execution. If the backing store does not 115 * exist, the read back will return garbage. We check a couple of pages, 116 * the first and last of the specified region to confirm the backing 117 * store + iomap does cover the entire memory region; and we check 118 * a random offset within as a quick spot check for bad memory. 119 */ 120 121 if (test_all) { 122 for (page = 0; page <= last; page += PAGE_SIZE) { 123 err = iopagetest(mem, page, caller); 124 if (err) 125 return err; 126 } 127 } else { 128 err = iopagetest(mem, 0, caller); 129 if (err) 130 return err; 131 132 err = iopagetest(mem, last, caller); 133 if (err) 134 return err; 135 136 err = iopagetest(mem, random_page(last), caller); 137 if (err) 138 return err; 139 } 140 141 return 0; 142 } 143 144 struct intel_memory_region * 145 intel_memory_region_lookup(struct drm_i915_private *i915, 146 u16 class, u16 instance) 147 { 148 struct intel_memory_region *mr; 149 int id; 150 151 /* XXX: consider maybe converting to an rb tree at some point */ 152 for_each_memory_region(mr, i915, id) { 153 if (mr->type == class && mr->instance == instance) 154 return mr; 155 } 156 157 return NULL; 158 } 159 160 struct intel_memory_region * 161 intel_memory_region_by_type(struct drm_i915_private *i915, 162 enum intel_memory_type mem_type) 163 { 164 struct intel_memory_region *mr; 165 int id; 166 167 for_each_memory_region(mr, i915, id) 168 if (mr->type == mem_type) 169 return mr; 170 171 return NULL; 172 } 173 174 /** 175 * intel_memory_region_reserve - Reserve a memory range 176 * @mem: The region for which we want to reserve a range. 177 * @offset: Start of the range to reserve. 178 * @size: The size of the range to reserve. 179 * 180 * Return: 0 on success, negative error code on failure. 181 */ 182 int intel_memory_region_reserve(struct intel_memory_region *mem, 183 resource_size_t offset, 184 resource_size_t size) 185 { 186 struct ttm_resource_manager *man = mem->region_private; 187 188 GEM_BUG_ON(mem->is_range_manager); 189 190 return i915_ttm_buddy_man_reserve(man, offset, size); 191 } 192 193 void intel_memory_region_debug(struct intel_memory_region *mr, 194 struct drm_printer *printer) 195 { 196 drm_printf(printer, "%s: ", mr->name); 197 198 if (mr->region_private) 199 ttm_resource_manager_debug(mr->region_private, printer); 200 else 201 drm_printf(printer, "total:%pa bytes\n", &mr->total); 202 } 203 204 static int intel_memory_region_memtest(struct intel_memory_region *mem, 205 void *caller) 206 { 207 struct drm_i915_private *i915 = mem->i915; 208 int err = 0; 209 210 if (!mem->io_start) 211 return 0; 212 213 if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) || i915->params.memtest) 214 err = iomemtest(mem, i915->params.memtest, caller); 215 216 return err; 217 } 218 219 struct intel_memory_region * 220 intel_memory_region_create(struct drm_i915_private *i915, 221 resource_size_t start, 222 resource_size_t size, 223 resource_size_t min_page_size, 224 resource_size_t io_start, 225 resource_size_t io_size, 226 u16 type, 227 u16 instance, 228 const struct intel_memory_region_ops *ops) 229 { 230 struct intel_memory_region *mem; 231 int err; 232 233 mem = kzalloc(sizeof(*mem), GFP_KERNEL); 234 if (!mem) 235 return ERR_PTR(-ENOMEM); 236 237 mem->i915 = i915; 238 mem->region = DEFINE_RES_MEM(start, size); 239 mem->io_start = io_start; 240 mem->io_size = io_size; 241 mem->min_page_size = min_page_size; 242 mem->ops = ops; 243 mem->total = size; 244 mem->type = type; 245 mem->instance = instance; 246 247 mutex_init(&mem->objects.lock); 248 INIT_LIST_HEAD(&mem->objects.list); 249 250 if (ops->init) { 251 err = ops->init(mem); 252 if (err) 253 goto err_free; 254 } 255 256 err = intel_memory_region_memtest(mem, (void *)_RET_IP_); 257 if (err) 258 goto err_release; 259 260 return mem; 261 262 err_release: 263 if (mem->ops->release) 264 mem->ops->release(mem); 265 err_free: 266 kfree(mem); 267 return ERR_PTR(err); 268 } 269 270 void intel_memory_region_set_name(struct intel_memory_region *mem, 271 const char *fmt, ...) 272 { 273 va_list ap; 274 275 va_start(ap, fmt); 276 vsnprintf(mem->name, sizeof(mem->name), fmt, ap); 277 va_end(ap); 278 } 279 280 void intel_memory_region_avail(struct intel_memory_region *mr, 281 u64 *avail, u64 *visible_avail) 282 { 283 if (mr->type == INTEL_MEMORY_LOCAL) { 284 i915_ttm_buddy_man_avail(mr->region_private, 285 avail, visible_avail); 286 *avail <<= PAGE_SHIFT; 287 *visible_avail <<= PAGE_SHIFT; 288 } else { 289 *avail = mr->total; 290 *visible_avail = mr->total; 291 } 292 } 293 294 void intel_memory_region_destroy(struct intel_memory_region *mem) 295 { 296 int ret = 0; 297 298 if (mem->ops->release) 299 ret = mem->ops->release(mem); 300 301 GEM_WARN_ON(!list_empty_careful(&mem->objects.list)); 302 mutex_destroy(&mem->objects.lock); 303 if (!ret) 304 kfree(mem); 305 } 306 307 /* Global memory region registration -- only slight layer inversions! */ 308 309 int intel_memory_regions_hw_probe(struct drm_i915_private *i915) 310 { 311 int err, i; 312 313 for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) { 314 struct intel_memory_region *mem = ERR_PTR(-ENODEV); 315 u16 type, instance; 316 317 if (!HAS_REGION(i915, BIT(i))) 318 continue; 319 320 type = intel_region_map[i].class; 321 instance = intel_region_map[i].instance; 322 switch (type) { 323 case INTEL_MEMORY_SYSTEM: 324 if (IS_DGFX(i915)) 325 mem = i915_gem_ttm_system_setup(i915, type, 326 instance); 327 else 328 mem = i915_gem_shmem_setup(i915, type, 329 instance); 330 break; 331 case INTEL_MEMORY_STOLEN_LOCAL: 332 mem = i915_gem_stolen_lmem_setup(i915, type, instance); 333 if (!IS_ERR(mem)) 334 i915->mm.stolen_region = mem; 335 break; 336 case INTEL_MEMORY_STOLEN_SYSTEM: 337 mem = i915_gem_stolen_smem_setup(i915, type, instance); 338 if (!IS_ERR(mem)) 339 i915->mm.stolen_region = mem; 340 break; 341 default: 342 continue; 343 } 344 345 if (IS_ERR(mem)) { 346 err = PTR_ERR(mem); 347 drm_err(&i915->drm, 348 "Failed to setup region(%d) type=%d\n", 349 err, type); 350 goto out_cleanup; 351 } 352 353 mem->id = i; 354 i915->mm.regions[i] = mem; 355 } 356 357 return 0; 358 359 out_cleanup: 360 intel_memory_regions_driver_release(i915); 361 return err; 362 } 363 364 void intel_memory_regions_driver_release(struct drm_i915_private *i915) 365 { 366 int i; 367 368 for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) { 369 struct intel_memory_region *region = 370 fetch_and_zero(&i915->mm.regions[i]); 371 372 if (region) 373 intel_memory_region_destroy(region); 374 } 375 } 376 377 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 378 #include "selftests/intel_memory_region.c" 379 #include "selftests/mock_region.c" 380 #endif 381