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 *
intel_engine_lookup_user(struct drm_i915_private * i915,u8 class,u8 instance)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
intel_engine_add_user(struct intel_engine_cs * engine)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
engine_cmp(void * priv,const struct list_head * A,const struct list_head * B)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
get_engines(struct drm_i915_private * i915)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
sort_engines(struct drm_i915_private * i915,struct list_head * engines)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
set_scheduler_caps(struct drm_i915_private * i915)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
intel_engine_class_repr(u8 class)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
legacy_ring_idx(const struct legacy_ring * ring)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
add_legacy_ring(struct legacy_ring * ring,struct intel_engine_cs * engine)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
intel_engines_driver_register(struct drm_i915_private * i915)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
intel_engines_has_context_isolation(struct drm_i915_private * i915)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