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(&engine->uabi_llist, &engine->i915->uabi_engines_llist);
  42 }
  43
  44 static const u8 uabi_classes[] = {
  45         [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER,
  46         [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,
  47         [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,
  48         [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,
  49         [COMPUTE_CLASS] = I915_ENGINE_CLASS_COMPUTE,
  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(A, typeof(*a), uabi_list);
  57         const struct intel_engine_cs *b =
  58                 container_of(B, typeof(*b), uabi_list);
  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(&i915->uabi_engines_llist);
  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(pos, typeof(*engine), uabi_llist);
  86                 list_add(&engine->uabi_list, engines);
  87         }
  88         list_sort(NULL, engines, engine_cmp);
  89 }
  90
  91 static void set_scheduler_caps(struct drm_i915_private *i915)
  92 {
  93         static const struct {
  94                 u8 engine;
  95                 u8 sched;
  96         } map[] = {
  97 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
  98                 MAP(HAS_PREEMPTION, PREEMPTION),
  99                 MAP(HAS_SEMAPHORES, SEMAPHORES),
 100                 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
 101 #undef MAP
 102         };
 103         struct intel_engine_cs *engine;
 104         u32 enabled, disabled;
 105
 106         enabled = 0;
 107         disabled = 0;
 108         for_each_uabi_engine(engine, i915) { /* all engines must agree! */
 109                 int i;
 110
 111                 if (engine->sched_engine->schedule)
 112                         enabled |= (I915_SCHEDULER_CAP_ENABLED |
 113                                     I915_SCHEDULER_CAP_PRIORITY);
 114                 else
 115                         disabled |= (I915_SCHEDULER_CAP_ENABLED |
 116                                      I915_SCHEDULER_CAP_PRIORITY);
 117
 118                 if (intel_uc_uses_guc_submission(&engine->gt->uc))
 119                         enabled |= I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP;
 120
 121                 for (i = 0; i < ARRAY_SIZE(map); i++) {
 122                         if (engine->flags & BIT(map[i].engine))
 123                                 enabled |= BIT(map[i].sched);
 124                         else
 125                                 disabled |= BIT(map[i].sched);
 126                 }
 127         }
 128
 129         i915->caps.scheduler = enabled & ~disabled;
 130         if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))
 131                 i915->caps.scheduler = 0;
 132 }
 133
 134 const char *intel_engine_class_repr(u8 class)
 135 {
 136         static const char * const uabi_names[] = {
 137                 [RENDER_CLASS] = "rcs",
 138                 [COPY_ENGINE_CLASS] = "bcs",
 139                 [VIDEO_DECODE_CLASS] = "vcs",
 140                 [VIDEO_ENHANCEMENT_CLASS] = "vecs",
 141                 [OTHER_CLASS] = "other",
 142                 [COMPUTE_CLASS] = "ccs",
 143         };
 144
 145         if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
 146                 return "xxx";
 147
 148         return uabi_names[class];
 149 }
 150
 151 struct legacy_ring {
 152         struct intel_gt *gt;
 153         u8 class;
 154         u8 instance;
 155 };
 156
 157 static int legacy_ring_idx(const struct legacy_ring *ring)
 158 {
 159         static const struct {
 160                 u8 base, max;
 161         } map[] = {
 162                 [RENDER_CLASS] = { RCS0, 1 },
 163                 [COPY_ENGINE_CLASS] = { BCS0, 1 },
 164                 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
 165                 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
 166                 [COMPUTE_CLASS] = { CCS0, I915_MAX_CCS },
 167         };
 168
 169         if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
 170                 return INVALID_ENGINE;
 171
 172         if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
 173                 return INVALID_ENGINE;
 174
 175         return map[ring->class].base + ring->instance;
 176 }
 177
 178 static void add_legacy_ring(struct legacy_ring *ring,
 179                             struct intel_engine_cs *engine)
 180 {
 181         if (engine->gt != ring->gt || engine->class != ring->class) {
 182                 ring->gt = engine->gt;
 183                 ring->class = engine->class;
 184                 ring->instance = 0;
 185         }
 186
 187         engine->legacy_idx = legacy_ring_idx(ring);
 188         if (engine->legacy_idx != INVALID_ENGINE)
 189                 ring->instance++;
 190 }
 191
 192 static void engine_rename(struct intel_engine_cs *engine, const char *name, u16 instance)
 193 {
 194         char old[sizeof(engine->name)];
 195
 196         memcpy(old, engine->name, sizeof(engine->name));
 197         scnprintf(engine->name, sizeof(engine->name), "%s%u", name, instance);
 198         drm_dbg(&engine->i915->drm, "renamed %s to %s\n", old, engine->name);
 199 }
 200
 201 void intel_engines_driver_register(struct drm_i915_private *i915)
 202 {
 203         struct legacy_ring ring = {};
 204         struct list_head *it, *next;
 205         struct rb_node **p, *prev;
 206         LIST_HEAD(engines);
 207
 208         sort_engines(i915, &engines);
 209
 210         prev = NULL;
 211         p = &i915->uabi_engines.rb_node;
 212         list_for_each_safe(it, next, &engines) {
 213                 struct intel_engine_cs *engine =
 214                         container_of(it, typeof(*engine), uabi_list);
 215
 216                 if (intel_gt_has_unrecoverable_error(engine->gt))
 217                         continue; /* ignore incomplete engines */
 218
 219                 /*
 220                  * We don't want to expose the GSC engine to the users, but we
 221                  * still rename it so it is easier to identify in the debug logs
 222                  */
 223                 if (engine->id == GSC0) {
 224                         engine_rename(engine, "gsc", 0);
 225                         continue;
 226                 }
 227
 228                 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
 229                 engine->uabi_class = uabi_classes[engine->class];
 230
 231                 GEM_BUG_ON(engine->uabi_class >=
 232                            ARRAY_SIZE(i915->engine_uabi_class_count));
 233                 engine->uabi_instance =
 234                         i915->engine_uabi_class_count[engine->uabi_class]++;
 235
 236                 /* Replace the internal name with the final user facing name */
 237                 engine_rename(engine,
 238                               intel_engine_class_repr(engine->class),
 239                               engine->uabi_instance);
 240
 241                 rb_link_node(&engine->uabi_node, prev, p);
 242                 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
 243
 244                 GEM_BUG_ON(intel_engine_lookup_user(i915,
 245                                                     engine->uabi_class,
 246                                                     engine->uabi_instance) != engine);
 247
 248                 /* Fix up the mapping to match default execbuf::user_map[] */
 249                 add_legacy_ring(&ring, engine);
 250
 251                 prev = &engine->uabi_node;
 252                 p = &prev->rb_right;
 253         }
 254
 255         if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&
 256             IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
 257                 struct intel_engine_cs *engine;
 258                 unsigned int isolation;
 259                 int class, inst;
 260                 int errors = 0;
 261
 262                 for (class = 0; class < ARRAY_SIZE(i915->engine_uabi_class_count); class++) {
 263                         for (inst = 0; inst < i915->engine_uabi_class_count[class]; inst++) {
 264                                 engine = intel_engine_lookup_user(i915,
 265                                                                   class, inst);
 266                                 if (!engine) {
 267                                         pr_err("UABI engine not found for { class:%d, instance:%d }\n",
 268                                                class, inst);
 269                                         errors++;
 270                                         continue;
 271                                 }
 272
 273                                 if (engine->uabi_class != class ||
 274                                     engine->uabi_instance != inst) {
 275                                         pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
 276                                                engine->name,
 277                                                engine->uabi_class,
 278                                                engine->uabi_instance,
 279                                                class, inst);
 280                                         errors++;
 281                                         continue;
 282                                 }
 283                         }
 284                 }
 285
 286                 /*
 287                  * Make sure that classes with multiple engine instances all
 288                  * share the same basic configuration.
 289                  */
 290                 isolation = intel_engines_has_context_isolation(i915);
 291                 for_each_uabi_engine(engine, i915) {
 292                         unsigned int bit = BIT(engine->uabi_class);
 293                         unsigned int expected = engine->default_state ? bit : 0;
 294
 295                         if ((isolation & bit) != expected) {
 296                                 pr_err("mismatching default context state for class %d on engine %s\n",
 297                                        engine->uabi_class, engine->name);
 298                                 errors++;
 299                         }
 300                 }
 301
 302                 if (drm_WARN(&i915->drm, errors,
 303                              "Invalid UABI engine mapping found"))
 304                         i915->uabi_engines = RB_ROOT;
 305         }
 306
 307         set_scheduler_caps(i915);
 308 }
 309
 310 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
 311 {
 312         struct intel_engine_cs *engine;
 313         unsigned int which;
 314
 315         which = 0;
 316         for_each_uabi_engine(engine, i915)
 317                 if (engine->default_state)
 318                         which |= BIT(engine->uabi_class);
 319
 320         return which;
 321 }