1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2019 Intel Corporation 5 */ 6 7 #include <linux/list.h> 8 #include <linux/list_sort.h> 9 #include <linux/llist.h> 10 11 #include "i915_drv.h" 12 #include "intel_engine.h" 13 #include "intel_engine_user.h" 14 #include "intel_gt.h" 15 16 struct intel_engine_cs * 17 intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance) 18 { 19 struct rb_node *p = i915->uabi_engines.rb_node; 20 21 while (p) { 22 struct intel_engine_cs *it = 23 rb_entry(p, typeof(*it), uabi_node); 24 25 if (class < it->uabi_class) 26 p = p->rb_left; 27 else if (class > it->uabi_class || 28 instance > it->uabi_instance) 29 p = p->rb_right; 30 else if (instance < it->uabi_instance) 31 p = p->rb_left; 32 else 33 return it; 34 } 35 36 return NULL; 37 } 38 39 void intel_engine_add_user(struct intel_engine_cs *engine) 40 { 41 llist_add((struct llist_node *)&engine->uabi_node, 42 (struct llist_head *)&engine->i915->uabi_engines); 43 } 44 45 static const u8 uabi_classes[] = { 46 [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER, 47 [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY, 48 [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO, 49 [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE, 50 }; 51 52 static int engine_cmp(void *priv, struct list_head *A, struct list_head *B) 53 { 54 const struct intel_engine_cs *a = 55 container_of((struct rb_node *)A, typeof(*a), uabi_node); 56 const struct intel_engine_cs *b = 57 container_of((struct rb_node *)B, typeof(*b), uabi_node); 58 59 if (uabi_classes[a->class] < uabi_classes[b->class]) 60 return -1; 61 if (uabi_classes[a->class] > uabi_classes[b->class]) 62 return 1; 63 64 if (a->instance < b->instance) 65 return -1; 66 if (a->instance > b->instance) 67 return 1; 68 69 return 0; 70 } 71 72 static struct llist_node *get_engines(struct drm_i915_private *i915) 73 { 74 return llist_del_all((struct llist_head *)&i915->uabi_engines); 75 } 76 77 static void sort_engines(struct drm_i915_private *i915, 78 struct list_head *engines) 79 { 80 struct llist_node *pos, *next; 81 82 llist_for_each_safe(pos, next, get_engines(i915)) { 83 struct intel_engine_cs *engine = 84 container_of((struct rb_node *)pos, typeof(*engine), 85 uabi_node); 86 list_add((struct list_head *)&engine->uabi_node, engines); 87 } 88 list_sort(NULL, engines, engine_cmp); 89 } 90 91 #ifdef __linux__ 92 static void set_scheduler_caps(struct drm_i915_private *i915) 93 { 94 static const struct { 95 u8 engine; 96 u8 sched; 97 } map[] = { 98 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) } 99 MAP(HAS_PREEMPTION, PREEMPTION), 100 MAP(HAS_SEMAPHORES, SEMAPHORES), 101 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS), 102 #undef MAP 103 }; 104 struct intel_engine_cs *engine; 105 u32 enabled, disabled; 106 107 enabled = 0; 108 disabled = 0; 109 for_each_uabi_engine(engine, i915) { /* all engines must agree! */ 110 int i; 111 112 if (engine->schedule) 113 enabled |= (I915_SCHEDULER_CAP_ENABLED | 114 I915_SCHEDULER_CAP_PRIORITY); 115 else 116 disabled |= (I915_SCHEDULER_CAP_ENABLED | 117 I915_SCHEDULER_CAP_PRIORITY); 118 119 for (i = 0; i < ARRAY_SIZE(map); i++) { 120 if (engine->flags & BIT(map[i].engine)) 121 enabled |= BIT(map[i].sched); 122 else 123 disabled |= BIT(map[i].sched); 124 } 125 } 126 127 i915->caps.scheduler = enabled & ~disabled; 128 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED)) 129 i915->caps.scheduler = 0; 130 } 131 #else 132 /* without the pointless ilog2 -> BIT() */ 133 static void set_scheduler_caps(struct drm_i915_private *i915) 134 { 135 static const struct { 136 u8 engine; 137 u8 sched; 138 } map[] = { 139 #define MAP(x, y) { I915_ENGINE_##x, I915_SCHEDULER_CAP_##y } 140 MAP(HAS_PREEMPTION, PREEMPTION), 141 MAP(HAS_SEMAPHORES, SEMAPHORES), 142 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS), 143 #undef MAP 144 }; 145 struct intel_engine_cs *engine; 146 u32 enabled, disabled; 147 148 enabled = 0; 149 disabled = 0; 150 for_each_uabi_engine(engine, i915) { /* all engines must agree! */ 151 int i; 152 153 if (engine->schedule) 154 enabled |= (I915_SCHEDULER_CAP_ENABLED | 155 I915_SCHEDULER_CAP_PRIORITY); 156 else 157 disabled |= (I915_SCHEDULER_CAP_ENABLED | 158 I915_SCHEDULER_CAP_PRIORITY); 159 160 for (i = 0; i < ARRAY_SIZE(map); i++) { 161 if (engine->flags & map[i].engine) 162 enabled |= map[i].sched; 163 else 164 disabled |= map[i].sched; 165 } 166 } 167 168 i915->caps.scheduler = enabled & ~disabled; 169 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED)) 170 i915->caps.scheduler = 0; 171 } 172 #endif 173 174 const char *intel_engine_class_repr(u8 class) 175 { 176 static const char * const uabi_names[] = { 177 [RENDER_CLASS] = "rcs", 178 [COPY_ENGINE_CLASS] = "bcs", 179 [VIDEO_DECODE_CLASS] = "vcs", 180 [VIDEO_ENHANCEMENT_CLASS] = "vecs", 181 }; 182 183 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class]) 184 return "xxx"; 185 186 return uabi_names[class]; 187 } 188 189 struct legacy_ring { 190 struct intel_gt *gt; 191 u8 class; 192 u8 instance; 193 }; 194 195 static int legacy_ring_idx(const struct legacy_ring *ring) 196 { 197 static const struct { 198 u8 base, max; 199 } map[] = { 200 [RENDER_CLASS] = { RCS0, 1 }, 201 [COPY_ENGINE_CLASS] = { BCS0, 1 }, 202 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS }, 203 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS }, 204 }; 205 206 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map))) 207 return INVALID_ENGINE; 208 209 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max)) 210 return INVALID_ENGINE; 211 212 return map[ring->class].base + ring->instance; 213 } 214 215 static void add_legacy_ring(struct legacy_ring *ring, 216 struct intel_engine_cs *engine) 217 { 218 if (engine->gt != ring->gt || engine->class != ring->class) { 219 ring->gt = engine->gt; 220 ring->class = engine->class; 221 ring->instance = 0; 222 } 223 224 engine->legacy_idx = legacy_ring_idx(ring); 225 if (engine->legacy_idx != INVALID_ENGINE) 226 ring->instance++; 227 } 228 229 void intel_engines_driver_register(struct drm_i915_private *i915) 230 { 231 struct legacy_ring ring = {}; 232 u8 uabi_instances[4] = {}; 233 struct list_head *it, *next; 234 struct rb_node **p, *prev; 235 DRM_LIST_HEAD(engines); 236 237 sort_engines(i915, &engines); 238 239 prev = NULL; 240 p = &i915->uabi_engines.rb_node; 241 list_for_each_safe(it, next, &engines) { 242 struct intel_engine_cs *engine = 243 container_of((struct rb_node *)it, typeof(*engine), 244 uabi_node); 245 char old[sizeof(engine->name)]; 246 247 if (intel_gt_has_init_error(engine->gt)) 248 continue; /* ignore incomplete engines */ 249 250 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes)); 251 engine->uabi_class = uabi_classes[engine->class]; 252 253 GEM_BUG_ON(engine->uabi_class >= ARRAY_SIZE(uabi_instances)); 254 engine->uabi_instance = uabi_instances[engine->uabi_class]++; 255 256 /* Replace the internal name with the final user facing name */ 257 memcpy(old, engine->name, sizeof(engine->name)); 258 scnprintf(engine->name, sizeof(engine->name), "%s%u", 259 intel_engine_class_repr(engine->class), 260 engine->uabi_instance); 261 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name); 262 263 rb_link_node(&engine->uabi_node, prev, p); 264 rb_insert_color(&engine->uabi_node, &i915->uabi_engines); 265 266 GEM_BUG_ON(intel_engine_lookup_user(i915, 267 engine->uabi_class, 268 engine->uabi_instance) != engine); 269 270 /* Fix up the mapping to match default execbuf::user_map[] */ 271 add_legacy_ring(&ring, engine); 272 273 prev = &engine->uabi_node; 274 p = &prev->rb_right; 275 } 276 277 if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) && 278 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) { 279 struct intel_engine_cs *engine; 280 unsigned int isolation; 281 int class, inst; 282 int errors = 0; 283 284 for (class = 0; class < ARRAY_SIZE(uabi_instances); class++) { 285 for (inst = 0; inst < uabi_instances[class]; inst++) { 286 engine = intel_engine_lookup_user(i915, 287 class, inst); 288 if (!engine) { 289 pr_err("UABI engine not found for { class:%d, instance:%d }\n", 290 class, inst); 291 errors++; 292 continue; 293 } 294 295 if (engine->uabi_class != class || 296 engine->uabi_instance != inst) { 297 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n", 298 engine->name, 299 engine->uabi_class, 300 engine->uabi_instance, 301 class, inst); 302 errors++; 303 continue; 304 } 305 } 306 } 307 308 /* 309 * Make sure that classes with multiple engine instances all 310 * share the same basic configuration. 311 */ 312 isolation = intel_engines_has_context_isolation(i915); 313 for_each_uabi_engine(engine, i915) { 314 unsigned int bit = BIT(engine->uabi_class); 315 unsigned int expected = engine->default_state ? bit : 0; 316 317 if ((isolation & bit) != expected) { 318 pr_err("mismatching default context state for class %d on engine %s\n", 319 engine->uabi_class, engine->name); 320 errors++; 321 } 322 } 323 324 if (drm_WARN(&i915->drm, errors, 325 "Invalid UABI engine mapping found")) 326 i915->uabi_engines = RB_ROOT; 327 } 328 329 set_scheduler_caps(i915); 330 } 331 332 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915) 333 { 334 struct intel_engine_cs *engine; 335 unsigned int which; 336 337 which = 0; 338 for_each_uabi_engine(engine, i915) 339 if (engine->default_state) 340 which |= BIT(engine->uabi_class); 341 342 return which; 343 } 344