drivers/gpu/drm/i915/gt/intel_engine_user.c

   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(&engine->gt->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                 [OTHER_CLASS] = "other",
 144                 [COMPUTE_CLASS] = "ccs",
 145         };
 146
 147         if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
 148                 return "xxx";
 149
 150         return uabi_names[class];
 151 }
 152
 153 struct legacy_ring {
 154         struct intel_gt *gt;
 155         u8 class;
 156         u8 instance;
 157 };
 158
 159 static int legacy_ring_idx(const struct legacy_ring *ring)
 160 {
 161         static const struct {
 162                 u8 base, max;
 163         } map[] = {
 164                 [RENDER_CLASS] = { RCS0, 1 },
 165                 [COPY_ENGINE_CLASS] = { BCS0, 1 },
 166                 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
 167                 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
 168                 [COMPUTE_CLASS] = { CCS0, I915_MAX_CCS },
 169         };
 170
 171         if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
 172                 return INVALID_ENGINE;
 173
 174         if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
 175                 return INVALID_ENGINE;
 176
 177         return map[ring->class].base + ring->instance;
 178 }
 179
 180 static void add_legacy_ring(struct legacy_ring *ring,
 181                             struct intel_engine_cs *engine)
 182 {
 183         if (engine->gt != ring->gt || engine->class != ring->class) {
 184                 ring->gt = engine->gt;
 185                 ring->class = engine->class;
 186                 ring->instance = 0;
 187         }
 188
 189         engine->legacy_idx = legacy_ring_idx(ring);
 190         if (engine->legacy_idx != INVALID_ENGINE)
 191                 ring->instance++;
 192 }
 193
 194 static void engine_rename(struct intel_engine_cs *engine, const char *name, u16 instance)
 195 {
 196         char old[sizeof(engine->name)];
 197
 198         memcpy(old, engine->name, sizeof(engine->name));
 199         scnprintf(engine->name, sizeof(engine->name), "%s%u", name, instance);
 200         drm_dbg(&engine->i915->drm, "renamed %s to %s\n", old, engine->name);
 201 }
 202
 203 void intel_engines_driver_register(struct drm_i915_private *i915)
 204 {
 205         struct legacy_ring ring = {};
 206         struct list_head *it, *next;
 207         struct rb_node **p, *prev;
 208         LIST_HEAD(engines);
 209
 210         sort_engines(i915, &engines);
 211
 212         prev = NULL;
 213         p = &i915->uabi_engines.rb_node;
 214         list_for_each_safe(it, next, &engines) {
 215                 struct intel_engine_cs *engine =
 216                         container_of((struct rb_node *)it, typeof(*engine),
 217                                      uabi_node);
 218
 219                 if (intel_gt_has_unrecoverable_error(engine->gt))
 220                         continue; /* ignore incomplete engines */
 221
 222                 /*
 223                  * We don't want to expose the GSC engine to the users, but we
 224                  * still rename it so it is easier to identify in the debug logs
 225                  */
 226                 if (engine->id == GSC0) {
 227                         engine_rename(engine, "gsc", 0);
 228                         continue;
 229                 }
 230
 231                 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
 232                 engine->uabi_class = uabi_classes[engine->class];
 233
 234                 GEM_BUG_ON(engine->uabi_class >=
 235                            ARRAY_SIZE(i915->engine_uabi_class_count));
 236                 engine->uabi_instance =
 237                         i915->engine_uabi_class_count[engine->uabi_class]++;
 238
 239                 /* Replace the internal name with the final user facing name */
 240                 engine_rename(engine,
 241                               intel_engine_class_repr(engine->class),
 242                               engine->uabi_instance);
 243
 244                 rb_link_node(&engine->uabi_node, prev, p);
 245                 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
 246
 247                 GEM_BUG_ON(intel_engine_lookup_user(i915,
 248                                                     engine->uabi_class,
 249                                                     engine->uabi_instance) != engine);
 250
 251                 /* Fix up the mapping to match default execbuf::user_map[] */
 252                 add_legacy_ring(&ring, engine);
 253
 254                 prev = &engine->uabi_node;
 255                 p = &prev->rb_right;
 256         }
 257
 258         if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&
 259             IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
 260                 struct intel_engine_cs *engine;
 261                 unsigned int isolation;
 262                 int class, inst;
 263                 int errors = 0;
 264
 265                 for (class = 0; class < ARRAY_SIZE(i915->engine_uabi_class_count); class++) {
 266                         for (inst = 0; inst < i915->engine_uabi_class_count[class]; inst++) {
 267                                 engine = intel_engine_lookup_user(i915,
 268                                                                   class, inst);
 269                                 if (!engine) {
 270                                         pr_err("UABI engine not found for { class:%d, instance:%d }\n",
 271                                                class, inst);
 272                                         errors++;
 273                                         continue;
 274                                 }
 275
 276                                 if (engine->uabi_class != class ||
 277                                     engine->uabi_instance != inst) {
 278                                         pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
 279                                                engine->name,
 280                                                engine->uabi_class,
 281                                                engine->uabi_instance,
 282                                                class, inst);
 283                                         errors++;
 284                                         continue;
 285                                 }
 286                         }
 287                 }
 288
 289                 /*
 290                  * Make sure that classes with multiple engine instances all
 291                  * share the same basic configuration.
 292                  */
 293                 isolation = intel_engines_has_context_isolation(i915);
 294                 for_each_uabi_engine(engine, i915) {
 295                         unsigned int bit = BIT(engine->uabi_class);
 296                         unsigned int expected = engine->default_state ? bit : 0;
 297
 298                         if ((isolation & bit) != expected) {
 299                                 pr_err("mismatching default context state for class %d on engine %s\n",
 300                                        engine->uabi_class, engine->name);
 301                                 errors++;
 302                         }
 303                 }
 304
 305                 if (drm_WARN(&i915->drm, errors,
 306                              "Invalid UABI engine mapping found"))
 307                         i915->uabi_engines = RB_ROOT;
 308         }
 309
 310         set_scheduler_caps(i915);
 311 }
 312
 313 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
 314 {
 315         struct intel_engine_cs *engine;
 316         unsigned int which;
 317
 318         which = 0;
 319         for_each_uabi_engine(engine, i915)
 320                 if (engine->default_state)
 321                         which |= BIT(engine->uabi_class);
 322
 323         return which;
 324 }