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
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 else
33 return it;
34 }
35
36 return NULL;
37}
38
39void intel_engine_add_user(struct intel_engine_cs *engine)
40{
41 llist_add(new: &engine->uabi_llist, head: &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(head: &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(new: &engine->uabi_list, head: engines);
90 }
91 list_sort(NULL, head: engines, cmp: 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 MAP
105 };
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 else
118 disabled |= (I915_SCHEDULER_CAP_ENABLED |
119 I915_SCHEDULER_CAP_PRIORITY);
120
121 if (intel_uc_uses_guc_submission(uc: &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 else
128 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] = { .base: BCS0, .max: 1 },
167 [VIDEO_DECODE_CLASS] = { .base: VCS0, I915_MAX_VCS },
168 [VIDEO_ENHANCEMENT_CLASS] = { .base: VECS0, I915_MAX_VECS },
169 [COMPUTE_CLASS] = { .base: 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(to: old, from: engine->name, len: sizeof(engine->name));
200 scnprintf(buf: engine->name, size: sizeof(engine->name), fmt: "%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: &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(gt: 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 facing
237 * name.
238 */
239 engine_rename(engine,
240 name: intel_engine_class_repr(class: engine->class),
241 instance: name_instance);
242
243 if (engine->uabi_class == I915_NO_UABI_CLASS)
244 continue;
245
246 rb_link_node(node: &engine->uabi_node, parent: prev, rb_link: 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: &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, instance: 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 all
293 * 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