2 * SPDX-License-Identifier: MIT
4 * Copyright © 2019 Intel Corporation
7 #include <linux/list.h>
8 #include <linux/list_sort.h>
9 #include <linux/llist.h>
12 #include "intel_engine.h"
13 #include "intel_engine_user.h"
15 struct intel_engine_cs *
16 intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance)
18 struct rb_node *p = i915->uabi_engines.rb_node;
21 struct intel_engine_cs *it =
22 rb_entry(p, typeof(*it), uabi_node);
24 if (class < it->uabi_class)
26 else if (class > it->uabi_class ||
27 instance > it->uabi_instance)
29 else if (instance < it->uabi_instance)
38 void intel_engine_add_user(struct intel_engine_cs *engine)
40 llist_add((struct llist_node *)&engine->uabi_node,
41 (struct llist_head *)&engine->i915->uabi_engines);
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,
51 static int engine_cmp(void *priv, struct list_head *A, struct list_head *B)
53 const struct intel_engine_cs *a =
54 container_of((struct rb_node *)A, typeof(*a), uabi_node);
55 const struct intel_engine_cs *b =
56 container_of((struct rb_node *)B, typeof(*b), uabi_node);
58 if (uabi_classes[a->class] < uabi_classes[b->class])
60 if (uabi_classes[a->class] > uabi_classes[b->class])
63 if (a->instance < b->instance)
65 if (a->instance > b->instance)
71 static struct llist_node *get_engines(struct drm_i915_private *i915)
73 return llist_del_all((struct llist_head *)&i915->uabi_engines);
76 static void sort_engines(struct drm_i915_private *i915,
77 struct list_head *engines)
79 struct llist_node *pos, *next;
81 llist_for_each_safe(pos, next, get_engines(i915)) {
82 struct intel_engine_cs *engine =
83 container_of((struct rb_node *)pos, typeof(*engine),
85 list_add((struct list_head *)&engine->uabi_node, engines);
87 list_sort(NULL, engines, engine_cmp);
90 static void set_scheduler_caps(struct drm_i915_private *i915)
96 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
97 MAP(HAS_PREEMPTION, PREEMPTION),
98 MAP(HAS_SEMAPHORES, SEMAPHORES),
99 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
102 struct intel_engine_cs *engine;
103 u32 enabled, disabled;
107 for_each_uabi_engine(engine, i915) { /* all engines must agree! */
110 if (engine->schedule)
111 enabled |= (I915_SCHEDULER_CAP_ENABLED |
112 I915_SCHEDULER_CAP_PRIORITY);
114 disabled |= (I915_SCHEDULER_CAP_ENABLED |
115 I915_SCHEDULER_CAP_PRIORITY);
117 for (i = 0; i < ARRAY_SIZE(map); i++) {
118 if (engine->flags & BIT(map[i].engine))
119 enabled |= BIT(map[i].sched);
121 disabled |= BIT(map[i].sched);
125 i915->caps.scheduler = enabled & ~disabled;
126 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))
127 i915->caps.scheduler = 0;
130 const char *intel_engine_class_repr(u8 class)
132 static const char * const uabi_names[] = {
133 [RENDER_CLASS] = "rcs",
134 [COPY_ENGINE_CLASS] = "bcs",
135 [VIDEO_DECODE_CLASS] = "vcs",
136 [VIDEO_ENHANCEMENT_CLASS] = "vecs",
139 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
142 return uabi_names[class];
151 static int legacy_ring_idx(const struct legacy_ring *ring)
153 static const struct {
156 [RENDER_CLASS] = { RCS0, 1 },
157 [COPY_ENGINE_CLASS] = { BCS0, 1 },
158 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
159 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
162 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
163 return INVALID_ENGINE;
165 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
166 return INVALID_ENGINE;
168 return map[ring->class].base + ring->instance;
171 static void add_legacy_ring(struct legacy_ring *ring,
172 struct intel_engine_cs *engine)
174 if (engine->gt != ring->gt || engine->class != ring->class) {
175 ring->gt = engine->gt;
176 ring->class = engine->class;
180 engine->legacy_idx = legacy_ring_idx(ring);
181 if (engine->legacy_idx != INVALID_ENGINE)
185 void intel_engines_driver_register(struct drm_i915_private *i915)
187 struct legacy_ring ring = {};
188 u8 uabi_instances[4] = {};
189 struct list_head *it, *next;
190 struct rb_node **p, *prev;
193 sort_engines(i915, &engines);
196 p = &i915->uabi_engines.rb_node;
197 list_for_each_safe(it, next, &engines) {
198 struct intel_engine_cs *engine =
199 container_of((struct rb_node *)it, typeof(*engine),
201 char old[sizeof(engine->name)];
203 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
204 engine->uabi_class = uabi_classes[engine->class];
206 GEM_BUG_ON(engine->uabi_class >= ARRAY_SIZE(uabi_instances));
207 engine->uabi_instance = uabi_instances[engine->uabi_class]++;
209 /* Replace the internal name with the final user facing name */
210 memcpy(old, engine->name, sizeof(engine->name));
211 scnprintf(engine->name, sizeof(engine->name), "%s%u",
212 intel_engine_class_repr(engine->class),
213 engine->uabi_instance);
214 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name);
216 rb_link_node(&engine->uabi_node, prev, p);
217 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
219 GEM_BUG_ON(intel_engine_lookup_user(i915,
221 engine->uabi_instance) != engine);
223 /* Fix up the mapping to match default execbuf::user_map[] */
224 add_legacy_ring(&ring, engine);
226 prev = &engine->uabi_node;
230 if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&
231 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
232 struct intel_engine_cs *engine;
233 unsigned int isolation;
237 for (class = 0; class < ARRAY_SIZE(uabi_instances); class++) {
238 for (inst = 0; inst < uabi_instances[class]; inst++) {
239 engine = intel_engine_lookup_user(i915,
242 pr_err("UABI engine not found for { class:%d, instance:%d }\n",
248 if (engine->uabi_class != class ||
249 engine->uabi_instance != inst) {
250 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
253 engine->uabi_instance,
262 * Make sure that classes with multiple engine instances all
263 * share the same basic configuration.
265 isolation = intel_engines_has_context_isolation(i915);
266 for_each_uabi_engine(engine, i915) {
267 unsigned int bit = BIT(engine->uabi_class);
268 unsigned int expected = engine->default_state ? bit : 0;
270 if ((isolation & bit) != expected) {
271 pr_err("mismatching default context state for class %d on engine %s\n",
272 engine->uabi_class, engine->name);
277 if (WARN(errors, "Invalid UABI engine mapping found"))
278 i915->uabi_engines = RB_ROOT;
281 set_scheduler_caps(i915);
284 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
286 struct intel_engine_cs *engine;
290 for_each_uabi_engine(engine, i915)
291 if (engine->default_state)
292 which |= BIT(engine->uabi_class);