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