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