1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include <linux/list.h> 7 #include <linux/list_sort.h> 8 #include <linux/llist.h> 9 10 #include "i915_drv.h" 11 #include "intel_engine.h" 12 #include "intel_engine_user.h" 13 #include "intel_gt.h" 14 #include "uc/intel_guc_submission.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 [COMPUTE_CLASS] = I915_ENGINE_CLASS_COMPUTE, 51 }; 52 53 static int engine_cmp(void *priv, const struct list_head *A, 54 const struct list_head *B) 55 { 56 const struct intel_engine_cs *a = 57 container_of((struct rb_node *)A, typeof(*a), uabi_node); 58 const struct intel_engine_cs *b = 59 container_of((struct rb_node *)B, typeof(*b), uabi_node); 60 61 if (uabi_classes[a->class] < uabi_classes[b->class]) 62 return -1; 63 if (uabi_classes[a->class] > uabi_classes[b->class]) 64 return 1; 65 66 if (a->instance < b->instance) 67 return -1; 68 if (a->instance > b->instance) 69 return 1; 70 71 return 0; 72 } 73 74 static struct llist_node *get_engines(struct drm_i915_private *i915) 75 { 76 return llist_del_all((struct llist_head *)&i915->uabi_engines); 77 } 78 79 static void sort_engines(struct drm_i915_private *i915, 80 struct list_head *engines) 81 { 82 struct llist_node *pos, *next; 83 84 llist_for_each_safe(pos, next, get_engines(i915)) { 85 struct intel_engine_cs *engine = 86 container_of((struct rb_node *)pos, typeof(*engine), 87 uabi_node); 88 list_add((struct list_head *)&engine->uabi_node, engines); 89 } 90 list_sort(NULL, engines, engine_cmp); 91 } 92 93 static void set_scheduler_caps(struct drm_i915_private *i915) 94 { 95 static const struct { 96 u8 engine; 97 u8 sched; 98 } map[] = { 99 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) } 100 MAP(HAS_PREEMPTION, PREEMPTION), 101 MAP(HAS_SEMAPHORES, SEMAPHORES), 102 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS), 103 #undef MAP 104 }; 105 struct intel_engine_cs *engine; 106 u32 enabled, disabled; 107 108 enabled = 0; 109 disabled = 0; 110 for_each_uabi_engine(engine, i915) { /* all engines must agree! */ 111 int i; 112 113 if (engine->sched_engine->schedule) 114 enabled |= (I915_SCHEDULER_CAP_ENABLED | 115 I915_SCHEDULER_CAP_PRIORITY); 116 else 117 disabled |= (I915_SCHEDULER_CAP_ENABLED | 118 I915_SCHEDULER_CAP_PRIORITY); 119 120 if (intel_uc_uses_guc_submission(&to_gt(i915)->uc)) 121 enabled |= I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP; 122 123 for (i = 0; i < ARRAY_SIZE(map); i++) { 124 if (engine->flags & BIT(map[i].engine)) 125 enabled |= BIT(map[i].sched); 126 else 127 disabled |= BIT(map[i].sched); 128 } 129 } 130 131 i915->caps.scheduler = enabled & ~disabled; 132 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED)) 133 i915->caps.scheduler = 0; 134 } 135 136 const char *intel_engine_class_repr(u8 class) 137 { 138 static const char * const uabi_names[] = { 139 [RENDER_CLASS] = "rcs", 140 [COPY_ENGINE_CLASS] = "bcs", 141 [VIDEO_DECODE_CLASS] = "vcs", 142 [VIDEO_ENHANCEMENT_CLASS] = "vecs", 143 [COMPUTE_CLASS] = "ccs", 144 }; 145 146 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class]) 147 return "xxx"; 148 149 return uabi_names[class]; 150 } 151 152 struct legacy_ring { 153 struct intel_gt *gt; 154 u8 class; 155 u8 instance; 156 }; 157 158 static int legacy_ring_idx(const struct legacy_ring *ring) 159 { 160 static const struct { 161 u8 base, max; 162 } map[] = { 163 [RENDER_CLASS] = { RCS0, 1 }, 164 [COPY_ENGINE_CLASS] = { BCS0, 1 }, 165 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS }, 166 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS }, 167 [COMPUTE_CLASS] = { CCS0, I915_MAX_CCS }, 168 }; 169 170 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map))) 171 return INVALID_ENGINE; 172 173 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max)) 174 return INVALID_ENGINE; 175 176 return map[ring->class].base + ring->instance; 177 } 178 179 static void add_legacy_ring(struct legacy_ring *ring, 180 struct intel_engine_cs *engine) 181 { 182 if (engine->gt != ring->gt || engine->class != ring->class) { 183 ring->gt = engine->gt; 184 ring->class = engine->class; 185 ring->instance = 0; 186 } 187 188 engine->legacy_idx = legacy_ring_idx(ring); 189 if (engine->legacy_idx != INVALID_ENGINE) 190 ring->instance++; 191 } 192 193 void intel_engines_driver_register(struct drm_i915_private *i915) 194 { 195 struct legacy_ring ring = {}; 196 struct list_head *it, *next; 197 struct rb_node **p, *prev; 198 LIST_HEAD(engines); 199 200 sort_engines(i915, &engines); 201 202 prev = NULL; 203 p = &i915->uabi_engines.rb_node; 204 list_for_each_safe(it, next, &engines) { 205 struct intel_engine_cs *engine = 206 container_of((struct rb_node *)it, typeof(*engine), 207 uabi_node); 208 char old[sizeof(engine->name)]; 209 210 if (intel_gt_has_unrecoverable_error(engine->gt)) 211 continue; /* ignore incomplete engines */ 212 213 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes)); 214 engine->uabi_class = uabi_classes[engine->class]; 215 216 GEM_BUG_ON(engine->uabi_class >= 217 ARRAY_SIZE(i915->engine_uabi_class_count)); 218 engine->uabi_instance = 219 i915->engine_uabi_class_count[engine->uabi_class]++; 220 221 /* Replace the internal name with the final user facing name */ 222 memcpy(old, engine->name, sizeof(engine->name)); 223 scnprintf(engine->name, sizeof(engine->name), "%s%u", 224 intel_engine_class_repr(engine->class), 225 engine->uabi_instance); 226 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name); 227 228 rb_link_node(&engine->uabi_node, prev, p); 229 rb_insert_color(&engine->uabi_node, &i915->uabi_engines); 230 231 GEM_BUG_ON(intel_engine_lookup_user(i915, 232 engine->uabi_class, 233 engine->uabi_instance) != engine); 234 235 /* Fix up the mapping to match default execbuf::user_map[] */ 236 add_legacy_ring(&ring, engine); 237 238 prev = &engine->uabi_node; 239 p = &prev->rb_right; 240 } 241 242 if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) && 243 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) { 244 struct intel_engine_cs *engine; 245 unsigned int isolation; 246 int class, inst; 247 int errors = 0; 248 249 for (class = 0; class < ARRAY_SIZE(i915->engine_uabi_class_count); class++) { 250 for (inst = 0; inst < i915->engine_uabi_class_count[class]; inst++) { 251 engine = intel_engine_lookup_user(i915, 252 class, inst); 253 if (!engine) { 254 pr_err("UABI engine not found for { class:%d, instance:%d }\n", 255 class, inst); 256 errors++; 257 continue; 258 } 259 260 if (engine->uabi_class != class || 261 engine->uabi_instance != inst) { 262 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n", 263 engine->name, 264 engine->uabi_class, 265 engine->uabi_instance, 266 class, inst); 267 errors++; 268 continue; 269 } 270 } 271 } 272 273 /* 274 * Make sure that classes with multiple engine instances all 275 * share the same basic configuration. 276 */ 277 isolation = intel_engines_has_context_isolation(i915); 278 for_each_uabi_engine(engine, i915) { 279 unsigned int bit = BIT(engine->uabi_class); 280 unsigned int expected = engine->default_state ? bit : 0; 281 282 if ((isolation & bit) != expected) { 283 pr_err("mismatching default context state for class %d on engine %s\n", 284 engine->uabi_class, engine->name); 285 errors++; 286 } 287 } 288 289 if (drm_WARN(&i915->drm, errors, 290 "Invalid UABI engine mapping found")) 291 i915->uabi_engines = RB_ROOT; 292 } 293 294 set_scheduler_caps(i915); 295 } 296 297 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915) 298 { 299 struct intel_engine_cs *engine; 300 unsigned int which; 301 302 which = 0; 303 for_each_uabi_engine(engine, i915) 304 if (engine->default_state) 305 which |= BIT(engine->uabi_class); 306 307 return which; 308 } 309