1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright © 2018 Intel Corporation
4  */
5 
6 #include <linux/sort.h>
7 
8 #include "intel_gpu_commands.h"
9 #include "intel_gt_pm.h"
10 #include "intel_rps.h"
11 
12 #include "i915_selftest.h"
13 #include "selftests/igt_flush_test.h"
14 
15 #define COUNT 5
16 
17 static int cmp_u32(const void *A, const void *B)
18 {
19 	const u32 *a = A, *b = B;
20 
21 	return *a - *b;
22 }
23 
24 static void perf_begin(struct intel_gt *gt)
25 {
26 	intel_gt_pm_get(gt);
27 
28 	/* Boost gpufreq to max [waitboost] and keep it fixed */
29 	atomic_inc(&gt->rps.num_waiters);
30 	queue_work(gt->i915->unordered_wq, &gt->rps.work);
31 	flush_work(&gt->rps.work);
32 }
33 
34 static int perf_end(struct intel_gt *gt)
35 {
36 	atomic_dec(&gt->rps.num_waiters);
37 	intel_gt_pm_put(gt);
38 
39 	return igt_flush_test(gt->i915);
40 }
41 
42 static i915_reg_t timestamp_reg(struct intel_engine_cs *engine)
43 {
44 	struct drm_i915_private *i915 = engine->i915;
45 
46 	if (GRAPHICS_VER(i915) == 5 || IS_G4X(i915))
47 		return RING_TIMESTAMP_UDW(engine->mmio_base);
48 	else
49 		return RING_TIMESTAMP(engine->mmio_base);
50 }
51 
52 static int write_timestamp(struct i915_request *rq, int slot)
53 {
54 	struct intel_timeline *tl =
55 		rcu_dereference_protected(rq->timeline,
56 					  !i915_request_signaled(rq));
57 	u32 cmd;
58 	u32 *cs;
59 
60 	cs = intel_ring_begin(rq, 4);
61 	if (IS_ERR(cs))
62 		return PTR_ERR(cs);
63 
64 	cmd = MI_STORE_REGISTER_MEM | MI_USE_GGTT;
65 	if (GRAPHICS_VER(rq->engine->i915) >= 8)
66 		cmd++;
67 	*cs++ = cmd;
68 	*cs++ = i915_mmio_reg_offset(timestamp_reg(rq->engine));
69 	*cs++ = tl->hwsp_offset + slot * sizeof(u32);
70 	*cs++ = 0;
71 
72 	intel_ring_advance(rq, cs);
73 
74 	return 0;
75 }
76 
77 static struct i915_vma *create_empty_batch(struct intel_context *ce)
78 {
79 	struct drm_i915_gem_object *obj;
80 	struct i915_vma *vma;
81 	u32 *cs;
82 	int err;
83 
84 	obj = i915_gem_object_create_internal(ce->engine->i915, PAGE_SIZE);
85 	if (IS_ERR(obj))
86 		return ERR_CAST(obj);
87 
88 	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
89 	if (IS_ERR(cs)) {
90 		err = PTR_ERR(cs);
91 		goto err_put;
92 	}
93 
94 	cs[0] = MI_BATCH_BUFFER_END;
95 
96 	i915_gem_object_flush_map(obj);
97 
98 	vma = i915_vma_instance(obj, ce->vm, NULL);
99 	if (IS_ERR(vma)) {
100 		err = PTR_ERR(vma);
101 		goto err_unpin;
102 	}
103 
104 	err = i915_vma_pin(vma, 0, 0, PIN_USER);
105 	if (err)
106 		goto err_unpin;
107 
108 	i915_gem_object_unpin_map(obj);
109 	return vma;
110 
111 err_unpin:
112 	i915_gem_object_unpin_map(obj);
113 err_put:
114 	i915_gem_object_put(obj);
115 	return ERR_PTR(err);
116 }
117 
118 static u32 trifilter(u32 *a)
119 {
120 	u64 sum;
121 
122 	sort(a, COUNT, sizeof(*a), cmp_u32, NULL);
123 
124 	sum = mul_u32_u32(a[2], 2);
125 	sum += a[1];
126 	sum += a[3];
127 
128 	return sum >> 2;
129 }
130 
131 static int perf_mi_bb_start(void *arg)
132 {
133 	struct intel_gt *gt = arg;
134 	struct intel_engine_cs *engine;
135 	enum intel_engine_id id;
136 	int err = 0;
137 
138 	if (GRAPHICS_VER(gt->i915) < 4) /* Any CS_TIMESTAMP? */
139 		return 0;
140 
141 	perf_begin(gt);
142 	for_each_engine(engine, gt, id) {
143 		struct intel_context *ce = engine->kernel_context;
144 		struct i915_vma *batch;
145 		u32 cycles[COUNT];
146 		int i;
147 
148 		if (GRAPHICS_VER(engine->i915) < 7 && engine->id != RCS0)
149 			continue;
150 
151 		intel_engine_pm_get(engine);
152 
153 		batch = create_empty_batch(ce);
154 		if (IS_ERR(batch)) {
155 			err = PTR_ERR(batch);
156 			intel_engine_pm_put(engine);
157 			break;
158 		}
159 
160 		err = i915_vma_sync(batch);
161 		if (err) {
162 			intel_engine_pm_put(engine);
163 			i915_vma_put(batch);
164 			break;
165 		}
166 
167 		for (i = 0; i < ARRAY_SIZE(cycles); i++) {
168 			struct i915_request *rq;
169 
170 			rq = i915_request_create(ce);
171 			if (IS_ERR(rq)) {
172 				err = PTR_ERR(rq);
173 				break;
174 			}
175 
176 			err = write_timestamp(rq, 2);
177 			if (err)
178 				goto out;
179 
180 			err = rq->engine->emit_bb_start(rq,
181 							i915_vma_offset(batch), 8,
182 							0);
183 			if (err)
184 				goto out;
185 
186 			err = write_timestamp(rq, 3);
187 			if (err)
188 				goto out;
189 
190 out:
191 			i915_request_get(rq);
192 			i915_request_add(rq);
193 
194 			if (i915_request_wait(rq, 0, HZ / 5) < 0)
195 				err = -EIO;
196 			i915_request_put(rq);
197 			if (err)
198 				break;
199 
200 			cycles[i] = rq->hwsp_seqno[3] - rq->hwsp_seqno[2];
201 		}
202 		i915_vma_put(batch);
203 		intel_engine_pm_put(engine);
204 		if (err)
205 			break;
206 
207 		pr_info("%s: MI_BB_START cycles: %u\n",
208 			engine->name, trifilter(cycles));
209 	}
210 	if (perf_end(gt))
211 		err = -EIO;
212 
213 	return err;
214 }
215 
216 static struct i915_vma *create_nop_batch(struct intel_context *ce)
217 {
218 	struct drm_i915_gem_object *obj;
219 	struct i915_vma *vma;
220 	u32 *cs;
221 	int err;
222 
223 	obj = i915_gem_object_create_internal(ce->engine->i915, SZ_64K);
224 	if (IS_ERR(obj))
225 		return ERR_CAST(obj);
226 
227 	cs = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
228 	if (IS_ERR(cs)) {
229 		err = PTR_ERR(cs);
230 		goto err_put;
231 	}
232 
233 	memset(cs, 0, SZ_64K);
234 	cs[SZ_64K / sizeof(*cs) - 1] = MI_BATCH_BUFFER_END;
235 
236 	i915_gem_object_flush_map(obj);
237 
238 	vma = i915_vma_instance(obj, ce->vm, NULL);
239 	if (IS_ERR(vma)) {
240 		err = PTR_ERR(vma);
241 		goto err_unpin;
242 	}
243 
244 	err = i915_vma_pin(vma, 0, 0, PIN_USER);
245 	if (err)
246 		goto err_unpin;
247 
248 	i915_gem_object_unpin_map(obj);
249 	return vma;
250 
251 err_unpin:
252 	i915_gem_object_unpin_map(obj);
253 err_put:
254 	i915_gem_object_put(obj);
255 	return ERR_PTR(err);
256 }
257 
258 static int perf_mi_noop(void *arg)
259 {
260 	struct intel_gt *gt = arg;
261 	struct intel_engine_cs *engine;
262 	enum intel_engine_id id;
263 	int err = 0;
264 
265 	if (GRAPHICS_VER(gt->i915) < 4) /* Any CS_TIMESTAMP? */
266 		return 0;
267 
268 	perf_begin(gt);
269 	for_each_engine(engine, gt, id) {
270 		struct intel_context *ce = engine->kernel_context;
271 		struct i915_vma *base, *nop;
272 		u32 cycles[COUNT];
273 		int i;
274 
275 		if (GRAPHICS_VER(engine->i915) < 7 && engine->id != RCS0)
276 			continue;
277 
278 		intel_engine_pm_get(engine);
279 
280 		base = create_empty_batch(ce);
281 		if (IS_ERR(base)) {
282 			err = PTR_ERR(base);
283 			intel_engine_pm_put(engine);
284 			break;
285 		}
286 
287 		err = i915_vma_sync(base);
288 		if (err) {
289 			i915_vma_put(base);
290 			intel_engine_pm_put(engine);
291 			break;
292 		}
293 
294 		nop = create_nop_batch(ce);
295 		if (IS_ERR(nop)) {
296 			err = PTR_ERR(nop);
297 			i915_vma_put(base);
298 			intel_engine_pm_put(engine);
299 			break;
300 		}
301 
302 		err = i915_vma_sync(nop);
303 		if (err) {
304 			i915_vma_put(nop);
305 			i915_vma_put(base);
306 			intel_engine_pm_put(engine);
307 			break;
308 		}
309 
310 		for (i = 0; i < ARRAY_SIZE(cycles); i++) {
311 			struct i915_request *rq;
312 
313 			rq = i915_request_create(ce);
314 			if (IS_ERR(rq)) {
315 				err = PTR_ERR(rq);
316 				break;
317 			}
318 
319 			err = write_timestamp(rq, 2);
320 			if (err)
321 				goto out;
322 
323 			err = rq->engine->emit_bb_start(rq,
324 							i915_vma_offset(base), 8,
325 							0);
326 			if (err)
327 				goto out;
328 
329 			err = write_timestamp(rq, 3);
330 			if (err)
331 				goto out;
332 
333 			err = rq->engine->emit_bb_start(rq,
334 							i915_vma_offset(nop),
335 							i915_vma_size(nop),
336 							0);
337 			if (err)
338 				goto out;
339 
340 			err = write_timestamp(rq, 4);
341 			if (err)
342 				goto out;
343 
344 out:
345 			i915_request_get(rq);
346 			i915_request_add(rq);
347 
348 			if (i915_request_wait(rq, 0, HZ / 5) < 0)
349 				err = -EIO;
350 			i915_request_put(rq);
351 			if (err)
352 				break;
353 
354 			cycles[i] =
355 				(rq->hwsp_seqno[4] - rq->hwsp_seqno[3]) -
356 				(rq->hwsp_seqno[3] - rq->hwsp_seqno[2]);
357 		}
358 		i915_vma_put(nop);
359 		i915_vma_put(base);
360 		intel_engine_pm_put(engine);
361 		if (err)
362 			break;
363 
364 		pr_info("%s: 16K MI_NOOP cycles: %u\n",
365 			engine->name, trifilter(cycles));
366 	}
367 	if (perf_end(gt))
368 		err = -EIO;
369 
370 	return err;
371 }
372 
373 int intel_engine_cs_perf_selftests(struct drm_i915_private *i915)
374 {
375 	static const struct i915_subtest tests[] = {
376 		SUBTEST(perf_mi_bb_start),
377 		SUBTEST(perf_mi_noop),
378 	};
379 
380 	if (intel_gt_is_wedged(to_gt(i915)))
381 		return 0;
382 
383 	return intel_gt_live_subtests(tests, to_gt(i915));
384 }
385 
386 static int intel_mmio_bases_check(void *arg)
387 {
388 	int i, j;
389 
390 	for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
391 		const struct engine_info *info = &intel_engines[i];
392 		u8 prev = U8_MAX;
393 
394 		for (j = 0; j < MAX_MMIO_BASES; j++) {
395 			u8 ver = info->mmio_bases[j].graphics_ver;
396 			u32 base = info->mmio_bases[j].base;
397 
398 			if (ver >= prev) {
399 				pr_err("%s(%s, class:%d, instance:%d): mmio base for graphics ver %u is before the one for ver %u\n",
400 				       __func__,
401 				       intel_engine_class_repr(info->class),
402 				       info->class, info->instance,
403 				       prev, ver);
404 				return -EINVAL;
405 			}
406 
407 			if (ver == 0)
408 				break;
409 
410 			if (!base) {
411 				pr_err("%s(%s, class:%d, instance:%d): invalid mmio base (%x) for graphics ver %u at entry %u\n",
412 				       __func__,
413 				       intel_engine_class_repr(info->class),
414 				       info->class, info->instance,
415 				       base, ver, j);
416 				return -EINVAL;
417 			}
418 
419 			prev = ver;
420 		}
421 
422 		pr_debug("%s: min graphics version supported for %s%d is %u\n",
423 			 __func__,
424 			 intel_engine_class_repr(info->class),
425 			 info->instance,
426 			 prev);
427 	}
428 
429 	return 0;
430 }
431 
432 int intel_engine_cs_mock_selftests(void)
433 {
434 	static const struct i915_subtest tests[] = {
435 		SUBTEST(intel_mmio_bases_check),
436 	};
437 
438 	return i915_subtests(tests, NULL);
439 }
440