1 /* $NetBSD: intel_engine_user.c,v 1.5 2021/12/19 11:59:11 riastradh Exp $ */
2
3 /*
4 * SPDX-License-Identifier: MIT
5 *
6 * Copyright © 2019 Intel Corporation
7 */
8
9 #include <sys/cdefs.h>
10 __KERNEL_RCSID(0, "$NetBSD: intel_engine_user.c,v 1.5 2021/12/19 11:59:11 riastradh Exp $");
11
12 #include <linux/list.h>
13 #include <linux/list_sort.h>
14 #include <linux/llist.h>
15
16 #include "i915_drv.h"
17 #include "intel_engine.h"
18 #include "intel_engine_user.h"
19 #include "intel_gt.h"
20
21 #include <linux/nbsd-namespace.h>
22
23 #ifdef __NetBSD__
24
25 static int
compare_engines(void * cookie,const void * va,const void * vb)26 compare_engines(void *cookie, const void *va, const void *vb)
27 {
28 const struct intel_engine_cs *csa = va;
29 const struct intel_engine_cs *csb = vb;
30
31 if (csa->uabi_class < csb->uabi_class)
32 return -1;
33 if (csa->uabi_class > csb->uabi_class)
34 return +1;
35 if (csa->uabi_instance < csb->uabi_instance)
36 return -1;
37 if (csa->uabi_instance > csb->uabi_instance)
38 return +1;
39 return 0;
40 }
41
42 static int
compare_engine_key(void * cookie,const void * vn,const void * vk)43 compare_engine_key(void *cookie, const void *vn, const void *vk)
44 {
45 const struct intel_engine_cs *cs = vn;
46 const u8 *k = vk;
47
48 if (cs->uabi_class < k[0])
49 return -1;
50 if (cs->uabi_class > k[0])
51 return +1;
52 if (cs->uabi_instance < k[1])
53 return -1;
54 if (cs->uabi_instance > k[1])
55 return +1;
56 return 0;
57 }
58
59 static const rb_tree_ops_t engine_ops = {
60 .rbto_compare_nodes = compare_engines,
61 .rbto_compare_key = compare_engine_key,
62 .rbto_node_offset = offsetof(struct intel_engine_cs, uabi_node.rbtree),
63 };
64
65 #endif
66
67 struct intel_engine_cs *
intel_engine_lookup_user(struct drm_i915_private * i915,u8 class,u8 instance)68 intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance)
69 {
70 #ifdef __NetBSD__
71 const u8 key[2] = {class, instance};
72 return rb_tree_find_node(&i915->uabi_engines.rbr_tree, key);
73 #else
74 struct rb_node *p = i915->uabi_engines.rb_node;
75
76 while (p) {
77 struct intel_engine_cs *it =
78 rb_entry(p, typeof(*it), uabi_node);
79
80 if (class < it->uabi_class)
81 p = p->rb_left;
82 else if (class > it->uabi_class ||
83 instance > it->uabi_instance)
84 p = p->rb_right;
85 else if (instance < it->uabi_instance)
86 p = p->rb_left;
87 else
88 return it;
89 }
90
91 return NULL;
92 #endif
93 }
94
intel_engine_add_user(struct intel_engine_cs * engine)95 void intel_engine_add_user(struct intel_engine_cs *engine)
96 {
97 llist_add(&engine->uabi_node.llist, &engine->i915->uabi_engines_llist);
98 }
99
100 static const u8 uabi_classes[] = {
101 [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER,
102 [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,
103 [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,
104 [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,
105 };
106
engine_cmp(void * priv,struct list_head * A,struct list_head * B)107 static int engine_cmp(void *priv, struct list_head *A, struct list_head *B)
108 {
109 const struct intel_engine_cs *a =
110 container_of(A, typeof(*a), uabi_node.list);
111 const struct intel_engine_cs *b =
112 container_of(B, typeof(*b), uabi_node.list);
113
114 if (uabi_classes[a->class] < uabi_classes[b->class])
115 return -1;
116 if (uabi_classes[a->class] > uabi_classes[b->class])
117 return 1;
118
119 if (a->instance < b->instance)
120 return -1;
121 if (a->instance > b->instance)
122 return 1;
123
124 return 0;
125 }
126
get_engines(struct drm_i915_private * i915)127 static struct llist_node *get_engines(struct drm_i915_private *i915)
128 {
129 return llist_del_all(&i915->uabi_engines_llist);
130 }
131
sort_engines(struct drm_i915_private * i915,struct list_head * engines)132 static void sort_engines(struct drm_i915_private *i915,
133 struct list_head *engines)
134 {
135 struct llist_node *pos, *next;
136
137 llist_for_each_safe(pos, next, get_engines(i915)) {
138 struct intel_engine_cs *engine =
139 llist_entry(pos, typeof(*engine), uabi_node.llist);
140 list_add(&engine->uabi_node.list, engines);
141 }
142 list_sort(NULL, engines, engine_cmp);
143 }
144
set_scheduler_caps(struct drm_i915_private * i915)145 static void set_scheduler_caps(struct drm_i915_private *i915)
146 {
147 static const struct {
148 u8 engine;
149 u8 sched;
150 } map[] = {
151 #define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
152 MAP(HAS_PREEMPTION, PREEMPTION),
153 MAP(HAS_SEMAPHORES, SEMAPHORES),
154 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
155 #undef MAP
156 };
157 struct intel_engine_cs *engine;
158 u32 enabled, disabled;
159
160 enabled = 0;
161 disabled = 0;
162 for_each_uabi_engine(engine, i915) { /* all engines must agree! */
163 int i;
164
165 if (engine->schedule)
166 enabled |= (I915_SCHEDULER_CAP_ENABLED |
167 I915_SCHEDULER_CAP_PRIORITY);
168 else
169 disabled |= (I915_SCHEDULER_CAP_ENABLED |
170 I915_SCHEDULER_CAP_PRIORITY);
171
172 for (i = 0; i < ARRAY_SIZE(map); i++) {
173 if (engine->flags & BIT(map[i].engine))
174 enabled |= BIT(map[i].sched);
175 else
176 disabled |= BIT(map[i].sched);
177 }
178 }
179
180 i915->caps.scheduler = enabled & ~disabled;
181 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))
182 i915->caps.scheduler = 0;
183 }
184
intel_engine_class_repr(u8 class)185 const char *intel_engine_class_repr(u8 class)
186 {
187 static const char * const uabi_names[] = {
188 [RENDER_CLASS] = "rcs",
189 [COPY_ENGINE_CLASS] = "bcs",
190 [VIDEO_DECODE_CLASS] = "vcs",
191 [VIDEO_ENHANCEMENT_CLASS] = "vecs",
192 };
193
194 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
195 return "xxx";
196
197 return uabi_names[class];
198 }
199
200 struct legacy_ring {
201 struct intel_gt *gt;
202 u8 class;
203 u8 instance;
204 };
205
legacy_ring_idx(const struct legacy_ring * ring)206 static int legacy_ring_idx(const struct legacy_ring *ring)
207 {
208 static const struct {
209 u8 base, max;
210 } map[] = {
211 [RENDER_CLASS] = { RCS0, 1 },
212 [COPY_ENGINE_CLASS] = { BCS0, 1 },
213 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
214 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
215 };
216
217 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
218 return INVALID_ENGINE;
219
220 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
221 return INVALID_ENGINE;
222
223 return map[ring->class].base + ring->instance;
224 }
225
add_legacy_ring(struct legacy_ring * ring,struct intel_engine_cs * engine)226 static void add_legacy_ring(struct legacy_ring *ring,
227 struct intel_engine_cs *engine)
228 {
229 if (engine->gt != ring->gt || engine->class != ring->class) {
230 ring->gt = engine->gt;
231 ring->class = engine->class;
232 ring->instance = 0;
233 }
234
235 engine->legacy_idx = legacy_ring_idx(ring);
236 if (engine->legacy_idx != INVALID_ENGINE)
237 ring->instance++;
238 }
239
intel_engines_driver_register(struct drm_i915_private * i915)240 void intel_engines_driver_register(struct drm_i915_private *i915)
241 {
242 struct legacy_ring ring = {};
243 u8 uabi_instances[4] = {};
244 struct list_head *it, *next;
245 struct rb_node **p, *prev;
246 LIST_HEAD(engines);
247
248 sort_engines(i915, &engines);
249
250 #ifdef __NetBSD__
251 __USE(prev);
252 __USE(p);
253 rb_tree_init(&i915->uabi_engines.rbr_tree, &engine_ops);
254 #else
255 prev = NULL;
256 p = &i915->uabi_engines.rb_node;
257 #endif
258 list_for_each_safe(it, next, &engines) {
259 struct intel_engine_cs *engine =
260 container_of(it, typeof(*engine), uabi_node.list);
261 char old[sizeof(engine->name)];
262
263 if (intel_gt_has_init_error(engine->gt))
264 continue; /* ignore incomplete engines */
265
266 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
267 engine->uabi_class = uabi_classes[engine->class];
268
269 GEM_BUG_ON(engine->uabi_class >= ARRAY_SIZE(uabi_instances));
270 engine->uabi_instance = uabi_instances[engine->uabi_class]++;
271
272 /* Replace the internal name with the final user facing name */
273 memcpy(old, engine->name, sizeof(engine->name));
274 scnprintf(engine->name, sizeof(engine->name), "%s%u",
275 intel_engine_class_repr(engine->class),
276 engine->uabi_instance);
277 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name);
278
279 #ifdef __NetBSD__
280 struct intel_engine_cs *collision __diagused;
281 collision = rb_tree_insert_node(&i915->uabi_engines.rbr_tree,
282 engine);
283 KASSERT(collision == engine);
284 #else
285 rb_link_node(&engine->uabi_node, prev, p);
286 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
287 #endif
288
289 GEM_BUG_ON(intel_engine_lookup_user(i915,
290 engine->uabi_class,
291 engine->uabi_instance) != engine);
292
293 /* Fix up the mapping to match default execbuf::user_map[] */
294 add_legacy_ring(&ring, engine);
295
296 #ifndef __NetBSD__
297 prev = &engine->uabi_node;
298 p = &prev->rb_right;
299 #endif
300 }
301
302 if (IS_ENABLED(CONFIG_DRM_I915_SELFTEST) &&
303 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
304 struct intel_engine_cs *engine;
305 unsigned int isolation;
306 int class, inst;
307 int errors = 0;
308
309 for (class = 0; class < ARRAY_SIZE(uabi_instances); class++) {
310 for (inst = 0; inst < uabi_instances[class]; inst++) {
311 engine = intel_engine_lookup_user(i915,
312 class, inst);
313 if (!engine) {
314 pr_err("UABI engine not found for { class:%d, instance:%d }\n",
315 class, inst);
316 errors++;
317 continue;
318 }
319
320 if (engine->uabi_class != class ||
321 engine->uabi_instance != inst) {
322 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
323 engine->name,
324 engine->uabi_class,
325 engine->uabi_instance,
326 class, inst);
327 errors++;
328 continue;
329 }
330 }
331 }
332
333 /*
334 * Make sure that classes with multiple engine instances all
335 * share the same basic configuration.
336 */
337 isolation = intel_engines_has_context_isolation(i915);
338 for_each_uabi_engine(engine, i915) {
339 unsigned int bit = BIT(engine->uabi_class);
340 unsigned int expected = engine->default_state ? bit : 0;
341
342 if ((isolation & bit) != expected) {
343 pr_err("mismatching default context state for class %d on engine %s\n",
344 engine->uabi_class, engine->name);
345 errors++;
346 }
347 }
348
349 if (WARN(errors, "Invalid UABI engine mapping found"))
350 #ifdef __NetBSD__
351 rb_tree_init(&i915->uabi_engines.rbr_tree,
352 &engine_ops);
353 #else
354 i915->uabi_engines = RB_ROOT;
355 #endif
356 }
357
358 set_scheduler_caps(i915);
359 }
360
intel_engines_has_context_isolation(struct drm_i915_private * i915)361 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
362 {
363 struct intel_engine_cs *engine;
364 unsigned int which;
365
366 which = 0;
367 for_each_uabi_engine(engine, i915)
368 if (engine->default_state)
369 which |= BIT(engine->uabi_class);
370
371 return which;
372 }
373