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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2019 Intel Corporation4 */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 16struct intel_engine_cs *17intel_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 else33 return it;34 }35 36 return NULL;37}38 39void intel_engine_add_user(struct intel_engine_cs *engine)40{41 llist_add(&engine->uabi_llist, &engine->i915->uabi_engines_llist);42}43 44#define I915_NO_UABI_CLASS ((u16)(-1))45 46static const u16 uabi_classes[] = {47 [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER,48 [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,49 [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,50 [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,51 [COMPUTE_CLASS] = I915_ENGINE_CLASS_COMPUTE,52 [OTHER_CLASS] = I915_NO_UABI_CLASS, /* Not exposed to users, no uabi class. */53};54 55static int engine_cmp(void *priv, const struct list_head *A,56 const struct list_head *B)57{58 const struct intel_engine_cs *a =59 container_of(A, typeof(*a), uabi_list);60 const struct intel_engine_cs *b =61 container_of(B, typeof(*b), uabi_list);62 63 if (uabi_classes[a->class] < uabi_classes[b->class])64 return -1;65 if (uabi_classes[a->class] > uabi_classes[b->class])66 return 1;67 68 if (a->instance < b->instance)69 return -1;70 if (a->instance > b->instance)71 return 1;72 73 return 0;74}75 76static struct llist_node *get_engines(struct drm_i915_private *i915)77{78 return llist_del_all(&i915->uabi_engines_llist);79}80 81static void sort_engines(struct drm_i915_private *i915,82 struct list_head *engines)83{84 struct llist_node *pos, *next;85 86 llist_for_each_safe(pos, next, get_engines(i915)) {87 struct intel_engine_cs *engine =88 container_of(pos, typeof(*engine), uabi_llist);89 list_add(&engine->uabi_list, engines);90 }91 list_sort(NULL, engines, engine_cmp);92}93 94static void set_scheduler_caps(struct drm_i915_private *i915)95{96 static const struct {97 u8 engine;98 u8 sched;99 } map[] = {100#define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }101 MAP(HAS_PREEMPTION, PREEMPTION),102 MAP(HAS_SEMAPHORES, SEMAPHORES),103 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),104#undef MAP105 };106 struct intel_engine_cs *engine;107 u32 enabled, disabled;108 109 enabled = 0;110 disabled = 0;111 for_each_uabi_engine(engine, i915) { /* all engines must agree! */112 int i;113 114 if (engine->sched_engine->schedule)115 enabled |= (I915_SCHEDULER_CAP_ENABLED |116 I915_SCHEDULER_CAP_PRIORITY);117 else118 disabled |= (I915_SCHEDULER_CAP_ENABLED |119 I915_SCHEDULER_CAP_PRIORITY);120 121 if (intel_uc_uses_guc_submission(&engine->gt->uc))122 enabled |= I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP;123 124 for (i = 0; i < ARRAY_SIZE(map); i++) {125 if (engine->flags & BIT(map[i].engine))126 enabled |= BIT(map[i].sched);127 else128 disabled |= BIT(map[i].sched);129 }130 }131 132 i915->caps.scheduler = enabled & ~disabled;133 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))134 i915->caps.scheduler = 0;135}136 137const char *intel_engine_class_repr(u8 class)138{139 static const char * const uabi_names[] = {140 [RENDER_CLASS] = "rcs",141 [COPY_ENGINE_CLASS] = "bcs",142 [VIDEO_DECODE_CLASS] = "vcs",143 [VIDEO_ENHANCEMENT_CLASS] = "vecs",144 [OTHER_CLASS] = "other",145 [COMPUTE_CLASS] = "ccs",146 };147 148 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])149 return "xxx";150 151 return uabi_names[class];152}153 154struct legacy_ring {155 struct intel_gt *gt;156 u8 class;157 u8 instance;158};159 160static int legacy_ring_idx(const struct legacy_ring *ring)161{162 static const struct {163 u8 base, max;164 } map[] = {165 [RENDER_CLASS] = { RCS0, 1 },166 [COPY_ENGINE_CLASS] = { BCS0, 1 },167 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },168 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },169 [COMPUTE_CLASS] = { CCS0, I915_MAX_CCS },170 };171 172 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))173 return INVALID_ENGINE;174 175 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))176 return INVALID_ENGINE;177 178 return map[ring->class].base + ring->instance;179}180 181static void add_legacy_ring(struct legacy_ring *ring,182 struct intel_engine_cs *engine)183{184 if (engine->gt != ring->gt || engine->class != ring->class) {185 ring->gt = engine->gt;186 ring->class = engine->class;187 ring->instance = 0;188 }189 190 engine->legacy_idx = legacy_ring_idx(ring);191 if (engine->legacy_idx != INVALID_ENGINE)192 ring->instance++;193}194 195static void engine_rename(struct intel_engine_cs *engine, const char *name, u16 instance)196{197 char old[sizeof(engine->name)];198 199 memcpy(old, engine->name, sizeof(engine->name));200 scnprintf(engine->name, sizeof(engine->name), "%s%u", name, instance);201 drm_dbg(&engine->i915->drm, "renamed %s to %s\n", old, engine->name);202}203 204void intel_engines_driver_register(struct drm_i915_private *i915)205{206 u16 name_instance, other_instance = 0;207 struct legacy_ring ring = {};208 struct list_head *it, *next;209 struct rb_node **p, *prev;210 LIST_HEAD(engines);211 212 sort_engines(i915, &engines);213 214 prev = NULL;215 p = &i915->uabi_engines.rb_node;216 list_for_each_safe(it, next, &engines) {217 struct intel_engine_cs *engine =218 container_of(it, typeof(*engine), uabi_list);219 220 if (intel_gt_has_unrecoverable_error(engine->gt))221 continue; /* ignore incomplete engines */222 223 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));224 engine->uabi_class = uabi_classes[engine->class];225 if (engine->uabi_class == I915_NO_UABI_CLASS) {226 name_instance = other_instance++;227 } else {228 GEM_BUG_ON(engine->uabi_class >=229 ARRAY_SIZE(i915->engine_uabi_class_count));230 name_instance =231 i915->engine_uabi_class_count[engine->uabi_class]++;232 }233 engine->uabi_instance = name_instance;234 235 /*236 * Replace the internal name with the final user and log facing237 * name.238 */239 engine_rename(engine,240 intel_engine_class_repr(engine->class),241 name_instance);242 243 if (engine->uabi_class == I915_NO_UABI_CLASS)244 continue;245 246 rb_link_node(&engine->uabi_node, prev, p);247 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);248 249 GEM_BUG_ON(intel_engine_lookup_user(i915,250 engine->uabi_class,251 engine->uabi_instance) != engine);252 253 /* Fix up the mapping to match default execbuf::user_map[] */254 add_legacy_ring(&ring, engine);255 256 prev = &engine->uabi_node;257 p = &prev->rb_right;258 }259 260 if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&261 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {262 struct intel_engine_cs *engine;263 unsigned int isolation;264 int class, inst;265 int errors = 0;266 267 for (class = 0; class < ARRAY_SIZE(i915->engine_uabi_class_count); class++) {268 for (inst = 0; inst < i915->engine_uabi_class_count[class]; inst++) {269 engine = intel_engine_lookup_user(i915,270 class, inst);271 if (!engine) {272 pr_err("UABI engine not found for { class:%d, instance:%d }\n",273 class, inst);274 errors++;275 continue;276 }277 278 if (engine->uabi_class != class ||279 engine->uabi_instance != inst) {280 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",281 engine->name,282 engine->uabi_class,283 engine->uabi_instance,284 class, inst);285 errors++;286 continue;287 }288 }289 }290 291 /*292 * Make sure that classes with multiple engine instances all293 * share the same basic configuration.294 */295 isolation = intel_engines_has_context_isolation(i915);296 for_each_uabi_engine(engine, i915) {297 unsigned int bit = BIT(engine->uabi_class);298 unsigned int expected = engine->default_state ? bit : 0;299 300 if ((isolation & bit) != expected) {301 pr_err("mismatching default context state for class %d on engine %s\n",302 engine->uabi_class, engine->name);303 errors++;304 }305 }306 307 if (drm_WARN(&i915->drm, errors,308 "Invalid UABI engine mapping found"))309 i915->uabi_engines = RB_ROOT;310 }311 312 set_scheduler_caps(i915);313}314 315unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)316{317 struct intel_engine_cs *engine;318 unsigned int which;319 320 which = 0;321 for_each_uabi_engine(engine, i915)322 if (engine->default_state)323 which |= BIT(engine->uabi_class);324 325 return which;326}327