1 /* $NetBSD: intel_engine_user.c,v 1.5 2021/12/19 11:59:11 riastradh Exp $ */ 2 3 /* 4 * SPDX-License-Identifier: MIT 5 * 6 * Copyright 2019 Intel Corporation 7 */ 8 9 #include <sys/cdefs.h> 10 __KERNEL_RCSID(0, "$NetBSD: intel_engine_user.c,v 1.5 2021/12/19 11:59:11 riastradh Exp $"); 11 12 #include <linux/list.h> 13 #include <linux/list_sort.h> 14 #include <linux/llist.h> 15 16 #include "i915_drv.h" 17 #include "intel_engine.h" 18 #include "intel_engine_user.h" 19 #include "intel_gt.h" 20 21 #include <linux/nbsd-namespace.h> 22 23 #ifdef __NetBSD__ 24 25 static int 26 compare_engines(void *cookie, const void *va, const void *vb) 27 { 28 const struct intel_engine_cs *csa = va; 29 const struct intel_engine_cs *csb = vb; 30 31 if (csa->uabi_class < csb->uabi_class) 32 return -1; 33 if (csa->uabi_class > csb->uabi_class) 34 return +1; 35 if (csa->uabi_instance < csb->uabi_instance) 36 return -1; 37 if (csa->uabi_instance > csb->uabi_instance) 38 return +1; 39 return 0; 40 } 41 42 static int 43 compare_engine_key(void *cookie, const void *vn, const void *vk) 44 { 45 const struct intel_engine_cs *cs = vn; 46 const u8 *k = vk; 47 48 if (cs->uabi_class < k[0]) 49 return -1; 50 if (cs->uabi_class > k[0]) 51 return +1; 52 if (cs->uabi_instance < k[1]) 53 return -1; 54 if (cs->uabi_instance > k[1]) 55 return +1; 56 return 0; 57 } 58 59 static const rb_tree_ops_t engine_ops = { 60 .rbto_compare_nodes = compare_engines, 61 .rbto_compare_key = compare_engine_key, 62 .rbto_node_offset = offsetof(struct intel_engine_cs, uabi_node.rbtree), 63 }; 64 65 #endif 66 67 struct intel_engine_cs * 68 intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance) 69 { 70 #ifdef __NetBSD__ 71 const u8 key[2] = {class, instance}; 72 return rb_tree_find_node(&i915->uabi_engines.rbr_tree, key); 73 #else 74 struct rb_node *p = i915->uabi_engines.rb_node; 75 76 while (p) { 77 struct intel_engine_cs *it = 78 rb_entry(p, typeof(*it), uabi_node); 79 80 if (class < it->uabi_class) 81 p = p->rb_left; 82 else if (class > it->uabi_class || 83 instance > it->uabi_instance) 84 p = p->rb_right; 85 else if (instance < it->uabi_instance) 86 p = p->rb_left; 87 else 88 return it; 89 } 90 91 return NULL; 92 #endif 93 } 94 95 void intel_engine_add_user(struct intel_engine_cs *engine) 96 { 97 llist_add(&engine->uabi_node.llist, &engine->i915->uabi_engines_llist); 98 } 99 100 static const u8 uabi_classes[] = { 101 [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER, 102 [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY, 103 [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO, 104 [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE, 105 }; 106 107 static int engine_cmp(void *priv, struct list_head *A, struct list_head *B) 108 { 109 const struct intel_engine_cs *a = 110 container_of(A, typeof(*a), uabi_node.list); 111 const struct intel_engine_cs *b = 112 container_of(B, typeof(*b), uabi_node.list); 113 114 if (uabi_classes[a->class] < uabi_classes[b->class]) 115 return -1; 116 if (uabi_classes[a->class] > uabi_classes[b->class]) 117 return 1; 118 119 if (a->instance < b->instance) 120 return -1; 121 if (a->instance > b->instance) 122 return 1; 123 124 return 0; 125 } 126 127 static struct llist_node *get_engines(struct drm_i915_private *i915) 128 { 129 return llist_del_all(&i915->uabi_engines_llist); 130 } 131 132 static void sort_engines(struct drm_i915_private *i915, 133 struct list_head *engines) 134 { 135 struct llist_node *pos, *next; 136 137 llist_for_each_safe(pos, next, get_engines(i915)) { 138 struct intel_engine_cs *engine = 139 llist_entry(pos, typeof(*engine), uabi_node.llist); 140 list_add(&engine->uabi_node.list, engines); 141 } 142 list_sort(NULL, engines, engine_cmp); 143 } 144 145 static void set_scheduler_caps(struct drm_i915_private *i915) 146 { 147 static const struct { 148 u8 engine; 149 u8 sched; 150 } map[] = { 151 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) } 152 MAP(HAS_PREEMPTION, PREEMPTION), 153 MAP(HAS_SEMAPHORES, SEMAPHORES), 154 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS), 155 #undef MAP 156 }; 157 struct intel_engine_cs *engine; 158 u32 enabled, disabled; 159 160 enabled = 0; 161 disabled = 0; 162 for_each_uabi_engine(engine, i915) { /* all engines must agree! */ 163 int i; 164 165 if (engine->schedule) 166 enabled |= (I915_SCHEDULER_CAP_ENABLED | 167 I915_SCHEDULER_CAP_PRIORITY); 168 else 169 disabled |= (I915_SCHEDULER_CAP_ENABLED | 170 I915_SCHEDULER_CAP_PRIORITY); 171 172 for (i = 0; i < ARRAY_SIZE(map); i++) { 173 if (engine->flags & BIT(map[i].engine)) 174 enabled |= BIT(map[i].sched); 175 else 176 disabled |= BIT(map[i].sched); 177 } 178 } 179 180 i915->caps.scheduler = enabled & ~disabled; 181 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED)) 182 i915->caps.scheduler = 0; 183 } 184 185 const char *intel_engine_class_repr(u8 class) 186 { 187 static const char * const uabi_names[] = { 188 [RENDER_CLASS] = "rcs", 189 [COPY_ENGINE_CLASS] = "bcs", 190 [VIDEO_DECODE_CLASS] = "vcs", 191 [VIDEO_ENHANCEMENT_CLASS] = "vecs", 192 }; 193 194 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class]) 195 return "xxx"; 196 197 return uabi_names[class]; 198 } 199 200 struct legacy_ring { 201 struct intel_gt *gt; 202 u8 class; 203 u8 instance; 204 }; 205 206 static int legacy_ring_idx(const struct legacy_ring *ring) 207 { 208 static const struct { 209 u8 base, max; 210 } map[] = { 211 [RENDER_CLASS] = { RCS0, 1 }, 212 [COPY_ENGINE_CLASS] = { BCS0, 1 }, 213 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS }, 214 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS }, 215 }; 216 217 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map))) 218 return INVALID_ENGINE; 219 220 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max)) 221 return INVALID_ENGINE; 222 223 return map[ring->class].base + ring->instance; 224 } 225 226 static void add_legacy_ring(struct legacy_ring *ring, 227 struct intel_engine_cs *engine) 228 { 229 if (engine->gt != ring->gt || engine->class != ring->class) { 230 ring->gt = engine->gt; 231 ring->class = engine->class; 232 ring->instance = 0; 233 } 234 235 engine->legacy_idx = legacy_ring_idx(ring); 236 if (engine->legacy_idx != INVALID_ENGINE) 237 ring->instance++; 238 } 239 240 void intel_engines_driver_register(struct drm_i915_private *i915) 241 { 242 struct legacy_ring ring = {}; 243 u8 uabi_instances[4] = {}; 244 struct list_head *it, *next; 245 struct rb_node **p, *prev; 246 LIST_HEAD(engines); 247 248 sort_engines(i915, &engines); 249 250 #ifdef __NetBSD__ 251 __USE(prev); 252 __USE(p); 253 rb_tree_init(&i915->uabi_engines.rbr_tree, &engine_ops); 254 #else 255 prev = NULL; 256 p = &i915->uabi_engines.rb_node; 257 #endif 258 list_for_each_safe(it, next, &engines) { 259 struct intel_engine_cs *engine = 260 container_of(it, typeof(*engine), uabi_node.list); 261 char old[sizeof(engine->name)]; 262 263 if (intel_gt_has_init_error(engine->gt)) 264 continue; /* ignore incomplete engines */ 265 266 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes)); 267 engine->uabi_class = uabi_classes[engine->class]; 268 269 GEM_BUG_ON(engine->uabi_class >= ARRAY_SIZE(uabi_instances)); 270 engine->uabi_instance = uabi_instances[engine->uabi_class]++; 271 272 /* Replace the internal name with the final user facing name */ 273 memcpy(old, engine->name, sizeof(engine->name)); 274 scnprintf(engine->name, sizeof(engine->name), "%s%u", 275 intel_engine_class_repr(engine->class), 276 engine->uabi_instance); 277 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name); 278 279 #ifdef __NetBSD__ 280 struct intel_engine_cs *collision __diagused; 281 collision = rb_tree_insert_node(&i915->uabi_engines.rbr_tree, 282 engine); 283 KASSERT(collision == engine); 284 #else 285 rb_link_node(&engine->uabi_node, prev, p); 286 rb_insert_color(&engine->uabi_node, &i915->uabi_engines); 287 #endif 288 289 GEM_BUG_ON(intel_engine_lookup_user(i915, 290 engine->uabi_class, 291 engine->uabi_instance) != engine); 292 293 /* Fix up the mapping to match default execbuf::user_map[] */ 294 add_legacy_ring(&ring, engine); 295 296 #ifndef __NetBSD__ 297 prev = &engine->uabi_node; 298 p = &prev->rb_right; 299 #endif 300 } 301 302 if (IS_ENABLED(CONFIG_DRM_I915_SELFTEST) && 303 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) { 304 struct intel_engine_cs *engine; 305 unsigned int isolation; 306 int class, inst; 307 int errors = 0; 308 309 for (class = 0; class < ARRAY_SIZE(uabi_instances); class++) { 310 for (inst = 0; inst < uabi_instances[class]; inst++) { 311 engine = intel_engine_lookup_user(i915, 312 class, inst); 313 if (!engine) { 314 pr_err("UABI engine not found for { class:%d, instance:%d }\n", 315 class, inst); 316 errors++; 317 continue; 318 } 319 320 if (engine->uabi_class != class || 321 engine->uabi_instance != inst) { 322 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n", 323 engine->name, 324 engine->uabi_class, 325 engine->uabi_instance, 326 class, inst); 327 errors++; 328 continue; 329 } 330 } 331 } 332 333 /* 334 * Make sure that classes with multiple engine instances all 335 * share the same basic configuration. 336 */ 337 isolation = intel_engines_has_context_isolation(i915); 338 for_each_uabi_engine(engine, i915) { 339 unsigned int bit = BIT(engine->uabi_class); 340 unsigned int expected = engine->default_state ? bit : 0; 341 342 if ((isolation & bit) != expected) { 343 pr_err("mismatching default context state for class %d on engine %s\n", 344 engine->uabi_class, engine->name); 345 errors++; 346 } 347 } 348 349 if (WARN(errors, "Invalid UABI engine mapping found")) 350 #ifdef __NetBSD__ 351 rb_tree_init(&i915->uabi_engines.rbr_tree, 352 &engine_ops); 353 #else 354 i915->uabi_engines = RB_ROOT; 355 #endif 356 } 357 358 set_scheduler_caps(i915); 359 } 360 361 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915) 362 { 363 struct intel_engine_cs *engine; 364 unsigned int which; 365 366 which = 0; 367 for_each_uabi_engine(engine, i915) 368 if (engine->default_state) 369 which |= BIT(engine->uabi_class); 370 371 return which; 372 } 373
Indexes created Sat Sep 20 22:09:52 GMT 2025