1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2015-2018 Etnaviv Project
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/component.h>
8 #include <linux/delay.h>
9 #include <linux/dma-fence.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/thermal.h>
17 
18 #include "etnaviv_cmdbuf.h"
19 #include "etnaviv_dump.h"
20 #include "etnaviv_gpu.h"
21 #include "etnaviv_gem.h"
22 #include "etnaviv_mmu.h"
23 #include "etnaviv_perfmon.h"
24 #include "etnaviv_sched.h"
25 #include "common.xml.h"
26 #include "state.xml.h"
27 #include "state_hi.xml.h"
28 #include "cmdstream.xml.h"
29 
30 static const struct platform_device_id gpu_ids[] = {
31 	{ .name = "etnaviv-gpu,2d" },
32 	{ },
33 };
34 
35 /*
36  * Driver functions:
37  */
38 
etnaviv_gpu_get_param(struct etnaviv_gpu * gpu,u32 param,u64 * value)39 int etnaviv_gpu_get_param(struct etnaviv_gpu *gpu, u32 param, u64 *value)
40 {
41 	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
42 
43 	switch (param) {
44 	case ETNAVIV_PARAM_GPU_MODEL:
45 		*value = gpu->identity.model;
46 		break;
47 
48 	case ETNAVIV_PARAM_GPU_REVISION:
49 		*value = gpu->identity.revision;
50 		break;
51 
52 	case ETNAVIV_PARAM_GPU_FEATURES_0:
53 		*value = gpu->identity.features;
54 		break;
55 
56 	case ETNAVIV_PARAM_GPU_FEATURES_1:
57 		*value = gpu->identity.minor_features0;
58 		break;
59 
60 	case ETNAVIV_PARAM_GPU_FEATURES_2:
61 		*value = gpu->identity.minor_features1;
62 		break;
63 
64 	case ETNAVIV_PARAM_GPU_FEATURES_3:
65 		*value = gpu->identity.minor_features2;
66 		break;
67 
68 	case ETNAVIV_PARAM_GPU_FEATURES_4:
69 		*value = gpu->identity.minor_features3;
70 		break;
71 
72 	case ETNAVIV_PARAM_GPU_FEATURES_5:
73 		*value = gpu->identity.minor_features4;
74 		break;
75 
76 	case ETNAVIV_PARAM_GPU_FEATURES_6:
77 		*value = gpu->identity.minor_features5;
78 		break;
79 
80 	case ETNAVIV_PARAM_GPU_FEATURES_7:
81 		*value = gpu->identity.minor_features6;
82 		break;
83 
84 	case ETNAVIV_PARAM_GPU_FEATURES_8:
85 		*value = gpu->identity.minor_features7;
86 		break;
87 
88 	case ETNAVIV_PARAM_GPU_FEATURES_9:
89 		*value = gpu->identity.minor_features8;
90 		break;
91 
92 	case ETNAVIV_PARAM_GPU_FEATURES_10:
93 		*value = gpu->identity.minor_features9;
94 		break;
95 
96 	case ETNAVIV_PARAM_GPU_FEATURES_11:
97 		*value = gpu->identity.minor_features10;
98 		break;
99 
100 	case ETNAVIV_PARAM_GPU_FEATURES_12:
101 		*value = gpu->identity.minor_features11;
102 		break;
103 
104 	case ETNAVIV_PARAM_GPU_STREAM_COUNT:
105 		*value = gpu->identity.stream_count;
106 		break;
107 
108 	case ETNAVIV_PARAM_GPU_REGISTER_MAX:
109 		*value = gpu->identity.register_max;
110 		break;
111 
112 	case ETNAVIV_PARAM_GPU_THREAD_COUNT:
113 		*value = gpu->identity.thread_count;
114 		break;
115 
116 	case ETNAVIV_PARAM_GPU_VERTEX_CACHE_SIZE:
117 		*value = gpu->identity.vertex_cache_size;
118 		break;
119 
120 	case ETNAVIV_PARAM_GPU_SHADER_CORE_COUNT:
121 		*value = gpu->identity.shader_core_count;
122 		break;
123 
124 	case ETNAVIV_PARAM_GPU_PIXEL_PIPES:
125 		*value = gpu->identity.pixel_pipes;
126 		break;
127 
128 	case ETNAVIV_PARAM_GPU_VERTEX_OUTPUT_BUFFER_SIZE:
129 		*value = gpu->identity.vertex_output_buffer_size;
130 		break;
131 
132 	case ETNAVIV_PARAM_GPU_BUFFER_SIZE:
133 		*value = gpu->identity.buffer_size;
134 		break;
135 
136 	case ETNAVIV_PARAM_GPU_INSTRUCTION_COUNT:
137 		*value = gpu->identity.instruction_count;
138 		break;
139 
140 	case ETNAVIV_PARAM_GPU_NUM_CONSTANTS:
141 		*value = gpu->identity.num_constants;
142 		break;
143 
144 	case ETNAVIV_PARAM_GPU_NUM_VARYINGS:
145 		*value = gpu->identity.varyings_count;
146 		break;
147 
148 	case ETNAVIV_PARAM_SOFTPIN_START_ADDR:
149 		if (priv->mmu_global->version == ETNAVIV_IOMMU_V2)
150 			*value = ETNAVIV_SOFTPIN_START_ADDRESS;
151 		else
152 			*value = ~0ULL;
153 		break;
154 
155 	case ETNAVIV_PARAM_GPU_PRODUCT_ID:
156 		*value = gpu->identity.product_id;
157 		break;
158 
159 	case ETNAVIV_PARAM_GPU_CUSTOMER_ID:
160 		*value = gpu->identity.customer_id;
161 		break;
162 
163 	case ETNAVIV_PARAM_GPU_ECO_ID:
164 		*value = gpu->identity.eco_id;
165 		break;
166 
167 	default:
168 		DBG("%s: invalid param: %u", dev_name(gpu->dev), param);
169 		return -EINVAL;
170 	}
171 
172 	return 0;
173 }
174 
175 
176 #define etnaviv_is_model_rev(gpu, mod, rev) \
177 	((gpu)->identity.model == chipModel_##mod && \
178 	 (gpu)->identity.revision == rev)
179 #define etnaviv_field(val, field) \
180 	(((val) & field##__MASK) >> field##__SHIFT)
181 
etnaviv_hw_specs(struct etnaviv_gpu * gpu)182 static void etnaviv_hw_specs(struct etnaviv_gpu *gpu)
183 {
184 	if (gpu->identity.minor_features0 &
185 	    chipMinorFeatures0_MORE_MINOR_FEATURES) {
186 		u32 specs[4];
187 		unsigned int streams;
188 
189 		specs[0] = gpu_read(gpu, VIVS_HI_CHIP_SPECS);
190 		specs[1] = gpu_read(gpu, VIVS_HI_CHIP_SPECS_2);
191 		specs[2] = gpu_read(gpu, VIVS_HI_CHIP_SPECS_3);
192 		specs[3] = gpu_read(gpu, VIVS_HI_CHIP_SPECS_4);
193 
194 		gpu->identity.stream_count = etnaviv_field(specs[0],
195 					VIVS_HI_CHIP_SPECS_STREAM_COUNT);
196 		gpu->identity.register_max = etnaviv_field(specs[0],
197 					VIVS_HI_CHIP_SPECS_REGISTER_MAX);
198 		gpu->identity.thread_count = etnaviv_field(specs[0],
199 					VIVS_HI_CHIP_SPECS_THREAD_COUNT);
200 		gpu->identity.vertex_cache_size = etnaviv_field(specs[0],
201 					VIVS_HI_CHIP_SPECS_VERTEX_CACHE_SIZE);
202 		gpu->identity.shader_core_count = etnaviv_field(specs[0],
203 					VIVS_HI_CHIP_SPECS_SHADER_CORE_COUNT);
204 		gpu->identity.pixel_pipes = etnaviv_field(specs[0],
205 					VIVS_HI_CHIP_SPECS_PIXEL_PIPES);
206 		gpu->identity.vertex_output_buffer_size =
207 			etnaviv_field(specs[0],
208 				VIVS_HI_CHIP_SPECS_VERTEX_OUTPUT_BUFFER_SIZE);
209 
210 		gpu->identity.buffer_size = etnaviv_field(specs[1],
211 					VIVS_HI_CHIP_SPECS_2_BUFFER_SIZE);
212 		gpu->identity.instruction_count = etnaviv_field(specs[1],
213 					VIVS_HI_CHIP_SPECS_2_INSTRUCTION_COUNT);
214 		gpu->identity.num_constants = etnaviv_field(specs[1],
215 					VIVS_HI_CHIP_SPECS_2_NUM_CONSTANTS);
216 
217 		gpu->identity.varyings_count = etnaviv_field(specs[2],
218 					VIVS_HI_CHIP_SPECS_3_VARYINGS_COUNT);
219 
220 		/* This overrides the value from older register if non-zero */
221 		streams = etnaviv_field(specs[3],
222 					VIVS_HI_CHIP_SPECS_4_STREAM_COUNT);
223 		if (streams)
224 			gpu->identity.stream_count = streams;
225 	}
226 
227 	/* Fill in the stream count if not specified */
228 	if (gpu->identity.stream_count == 0) {
229 		if (gpu->identity.model >= 0x1000)
230 			gpu->identity.stream_count = 4;
231 		else
232 			gpu->identity.stream_count = 1;
233 	}
234 
235 	/* Convert the register max value */
236 	if (gpu->identity.register_max)
237 		gpu->identity.register_max = 1 << gpu->identity.register_max;
238 	else if (gpu->identity.model == chipModel_GC400)
239 		gpu->identity.register_max = 32;
240 	else
241 		gpu->identity.register_max = 64;
242 
243 	/* Convert thread count */
244 	if (gpu->identity.thread_count)
245 		gpu->identity.thread_count = 1 << gpu->identity.thread_count;
246 	else if (gpu->identity.model == chipModel_GC400)
247 		gpu->identity.thread_count = 64;
248 	else if (gpu->identity.model == chipModel_GC500 ||
249 		 gpu->identity.model == chipModel_GC530)
250 		gpu->identity.thread_count = 128;
251 	else
252 		gpu->identity.thread_count = 256;
253 
254 	if (gpu->identity.vertex_cache_size == 0)
255 		gpu->identity.vertex_cache_size = 8;
256 
257 	if (gpu->identity.shader_core_count == 0) {
258 		if (gpu->identity.model >= 0x1000)
259 			gpu->identity.shader_core_count = 2;
260 		else
261 			gpu->identity.shader_core_count = 1;
262 	}
263 
264 	if (gpu->identity.pixel_pipes == 0)
265 		gpu->identity.pixel_pipes = 1;
266 
267 	/* Convert virtex buffer size */
268 	if (gpu->identity.vertex_output_buffer_size) {
269 		gpu->identity.vertex_output_buffer_size =
270 			1 << gpu->identity.vertex_output_buffer_size;
271 	} else if (gpu->identity.model == chipModel_GC400) {
272 		if (gpu->identity.revision < 0x4000)
273 			gpu->identity.vertex_output_buffer_size = 512;
274 		else if (gpu->identity.revision < 0x4200)
275 			gpu->identity.vertex_output_buffer_size = 256;
276 		else
277 			gpu->identity.vertex_output_buffer_size = 128;
278 	} else {
279 		gpu->identity.vertex_output_buffer_size = 512;
280 	}
281 
282 	switch (gpu->identity.instruction_count) {
283 	case 0:
284 		if (etnaviv_is_model_rev(gpu, GC2000, 0x5108) ||
285 		    gpu->identity.model == chipModel_GC880)
286 			gpu->identity.instruction_count = 512;
287 		else
288 			gpu->identity.instruction_count = 256;
289 		break;
290 
291 	case 1:
292 		gpu->identity.instruction_count = 1024;
293 		break;
294 
295 	case 2:
296 		gpu->identity.instruction_count = 2048;
297 		break;
298 
299 	default:
300 		gpu->identity.instruction_count = 256;
301 		break;
302 	}
303 
304 	if (gpu->identity.num_constants == 0)
305 		gpu->identity.num_constants = 168;
306 
307 	if (gpu->identity.varyings_count == 0) {
308 		if (gpu->identity.minor_features1 & chipMinorFeatures1_HALTI0)
309 			gpu->identity.varyings_count = 12;
310 		else
311 			gpu->identity.varyings_count = 8;
312 	}
313 
314 	/*
315 	 * For some cores, two varyings are consumed for position, so the
316 	 * maximum varying count needs to be reduced by one.
317 	 */
318 	if (etnaviv_is_model_rev(gpu, GC5000, 0x5434) ||
319 	    etnaviv_is_model_rev(gpu, GC4000, 0x5222) ||
320 	    etnaviv_is_model_rev(gpu, GC4000, 0x5245) ||
321 	    etnaviv_is_model_rev(gpu, GC4000, 0x5208) ||
322 	    etnaviv_is_model_rev(gpu, GC3000, 0x5435) ||
323 	    etnaviv_is_model_rev(gpu, GC2200, 0x5244) ||
324 	    etnaviv_is_model_rev(gpu, GC2100, 0x5108) ||
325 	    etnaviv_is_model_rev(gpu, GC2000, 0x5108) ||
326 	    etnaviv_is_model_rev(gpu, GC1500, 0x5246) ||
327 	    etnaviv_is_model_rev(gpu, GC880, 0x5107) ||
328 	    etnaviv_is_model_rev(gpu, GC880, 0x5106))
329 		gpu->identity.varyings_count -= 1;
330 }
331 
etnaviv_hw_identify(struct etnaviv_gpu * gpu)332 static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
333 {
334 	u32 chipIdentity;
335 
336 	chipIdentity = gpu_read(gpu, VIVS_HI_CHIP_IDENTITY);
337 
338 	/* Special case for older graphic cores. */
339 	if (etnaviv_field(chipIdentity, VIVS_HI_CHIP_IDENTITY_FAMILY) == 0x01) {
340 		gpu->identity.model    = chipModel_GC500;
341 		gpu->identity.revision = etnaviv_field(chipIdentity,
342 					 VIVS_HI_CHIP_IDENTITY_REVISION);
343 	} else {
344 		u32 chipDate = gpu_read(gpu, VIVS_HI_CHIP_DATE);
345 
346 		gpu->identity.model = gpu_read(gpu, VIVS_HI_CHIP_MODEL);
347 		gpu->identity.revision = gpu_read(gpu, VIVS_HI_CHIP_REV);
348 		gpu->identity.customer_id = gpu_read(gpu, VIVS_HI_CHIP_CUSTOMER_ID);
349 
350 		/*
351 		 * Reading these two registers on GC600 rev 0x19 result in a
352 		 * unhandled fault: external abort on non-linefetch
353 		 */
354 		if (!etnaviv_is_model_rev(gpu, GC600, 0x19)) {
355 			gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
356 			gpu->identity.eco_id = gpu_read(gpu, VIVS_HI_CHIP_ECO_ID);
357 		}
358 
359 		/*
360 		 * !!!! HACK ALERT !!!!
361 		 * Because people change device IDs without letting software
362 		 * know about it - here is the hack to make it all look the
363 		 * same.  Only for GC400 family.
364 		 */
365 		if ((gpu->identity.model & 0xff00) == 0x0400 &&
366 		    gpu->identity.model != chipModel_GC420) {
367 			gpu->identity.model = gpu->identity.model & 0x0400;
368 		}
369 
370 		/* Another special case */
371 		if (etnaviv_is_model_rev(gpu, GC300, 0x2201)) {
372 			u32 chipTime = gpu_read(gpu, VIVS_HI_CHIP_TIME);
373 
374 			if (chipDate == 0x20080814 && chipTime == 0x12051100) {
375 				/*
376 				 * This IP has an ECO; put the correct
377 				 * revision in it.
378 				 */
379 				gpu->identity.revision = 0x1051;
380 			}
381 		}
382 
383 		/*
384 		 * NXP likes to call the GPU on the i.MX6QP GC2000+, but in
385 		 * reality it's just a re-branded GC3000. We can identify this
386 		 * core by the upper half of the revision register being all 1.
387 		 * Fix model/rev here, so all other places can refer to this
388 		 * core by its real identity.
389 		 */
390 		if (etnaviv_is_model_rev(gpu, GC2000, 0xffff5450)) {
391 			gpu->identity.model = chipModel_GC3000;
392 			gpu->identity.revision &= 0xffff;
393 		}
394 
395 		if (etnaviv_is_model_rev(gpu, GC1000, 0x5037) && (chipDate == 0x20120617))
396 			gpu->identity.eco_id = 1;
397 
398 		if (etnaviv_is_model_rev(gpu, GC320, 0x5303) && (chipDate == 0x20140511))
399 			gpu->identity.eco_id = 1;
400 	}
401 
402 	dev_info(gpu->dev, "model: GC%x, revision: %x\n",
403 		 gpu->identity.model, gpu->identity.revision);
404 
405 	gpu->idle_mask = ~VIVS_HI_IDLE_STATE_AXI_LP;
406 	/*
407 	 * If there is a match in the HWDB, we aren't interested in the
408 	 * remaining register values, as they might be wrong.
409 	 */
410 	if (etnaviv_fill_identity_from_hwdb(gpu))
411 		return;
412 
413 	gpu->identity.features = gpu_read(gpu, VIVS_HI_CHIP_FEATURE);
414 
415 	/* Disable fast clear on GC700. */
416 	if (gpu->identity.model == chipModel_GC700)
417 		gpu->identity.features &= ~chipFeatures_FAST_CLEAR;
418 
419 	/* These models/revisions don't have the 2D pipe bit */
420 	if ((gpu->identity.model == chipModel_GC500 &&
421 	     gpu->identity.revision <= 2) ||
422 	    gpu->identity.model == chipModel_GC300)
423 		gpu->identity.features |= chipFeatures_PIPE_2D;
424 
425 	if ((gpu->identity.model == chipModel_GC500 &&
426 	     gpu->identity.revision < 2) ||
427 	    (gpu->identity.model == chipModel_GC300 &&
428 	     gpu->identity.revision < 0x2000)) {
429 
430 		/*
431 		 * GC500 rev 1.x and GC300 rev < 2.0 doesn't have these
432 		 * registers.
433 		 */
434 		gpu->identity.minor_features0 = 0;
435 		gpu->identity.minor_features1 = 0;
436 		gpu->identity.minor_features2 = 0;
437 		gpu->identity.minor_features3 = 0;
438 		gpu->identity.minor_features4 = 0;
439 		gpu->identity.minor_features5 = 0;
440 	} else
441 		gpu->identity.minor_features0 =
442 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_0);
443 
444 	if (gpu->identity.minor_features0 &
445 	    chipMinorFeatures0_MORE_MINOR_FEATURES) {
446 		gpu->identity.minor_features1 =
447 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_1);
448 		gpu->identity.minor_features2 =
449 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_2);
450 		gpu->identity.minor_features3 =
451 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_3);
452 		gpu->identity.minor_features4 =
453 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_4);
454 		gpu->identity.minor_features5 =
455 				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_5);
456 	}
457 
458 	/* GC600/300 idle register reports zero bits where modules aren't present */
459 	if (gpu->identity.model == chipModel_GC600 ||
460 	    gpu->identity.model == chipModel_GC300)
461 		gpu->idle_mask = VIVS_HI_IDLE_STATE_TX |
462 				 VIVS_HI_IDLE_STATE_RA |
463 				 VIVS_HI_IDLE_STATE_SE |
464 				 VIVS_HI_IDLE_STATE_PA |
465 				 VIVS_HI_IDLE_STATE_SH |
466 				 VIVS_HI_IDLE_STATE_PE |
467 				 VIVS_HI_IDLE_STATE_DE |
468 				 VIVS_HI_IDLE_STATE_FE;
469 
470 	etnaviv_hw_specs(gpu);
471 }
472 
etnaviv_gpu_load_clock(struct etnaviv_gpu * gpu,u32 clock)473 static void etnaviv_gpu_load_clock(struct etnaviv_gpu *gpu, u32 clock)
474 {
475 	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock |
476 		  VIVS_HI_CLOCK_CONTROL_FSCALE_CMD_LOAD);
477 	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock);
478 }
479 
etnaviv_gpu_update_clock(struct etnaviv_gpu * gpu)480 static void etnaviv_gpu_update_clock(struct etnaviv_gpu *gpu)
481 {
482 	if (gpu->identity.minor_features2 &
483 	    chipMinorFeatures2_DYNAMIC_FREQUENCY_SCALING) {
484 		clk_set_rate(gpu->clk_core,
485 			     gpu->base_rate_core >> gpu->freq_scale);
486 		clk_set_rate(gpu->clk_shader,
487 			     gpu->base_rate_shader >> gpu->freq_scale);
488 	} else {
489 		unsigned int fscale = 1 << (6 - gpu->freq_scale);
490 		u32 clock = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
491 
492 		clock &= ~VIVS_HI_CLOCK_CONTROL_FSCALE_VAL__MASK;
493 		clock |= VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(fscale);
494 		etnaviv_gpu_load_clock(gpu, clock);
495 	}
496 
497 	/*
498 	 * Choose number of wait cycles to target a ~30us (1/32768) max latency
499 	 * until new work is picked up by the FE when it polls in the idle loop.
500 	 * If the GPU base frequency is unknown use 200 wait cycles.
501 	 */
502 	gpu->fe_waitcycles = clamp(gpu->base_rate_core >> (15 - gpu->freq_scale),
503 				   200UL, 0xffffUL);
504 }
505 
etnaviv_hw_reset(struct etnaviv_gpu * gpu)506 static int etnaviv_hw_reset(struct etnaviv_gpu *gpu)
507 {
508 	u32 control, idle;
509 	unsigned long timeout;
510 	bool failed = true;
511 
512 	/* We hope that the GPU resets in under one second */
513 	timeout = jiffies + msecs_to_jiffies(1000);
514 
515 	while (time_is_after_jiffies(timeout)) {
516 		/* enable clock */
517 		unsigned int fscale = 1 << (6 - gpu->freq_scale);
518 		control = VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(fscale);
519 		etnaviv_gpu_load_clock(gpu, control);
520 
521 		/* isolate the GPU. */
522 		control |= VIVS_HI_CLOCK_CONTROL_ISOLATE_GPU;
523 		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
524 
525 		if (gpu->sec_mode == ETNA_SEC_KERNEL) {
526 			gpu_write(gpu, VIVS_MMUv2_AHB_CONTROL,
527 			          VIVS_MMUv2_AHB_CONTROL_RESET);
528 		} else {
529 			/* set soft reset. */
530 			control |= VIVS_HI_CLOCK_CONTROL_SOFT_RESET;
531 			gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
532 		}
533 
534 		/* wait for reset. */
535 		usleep_range(10, 20);
536 
537 		/* reset soft reset bit. */
538 		control &= ~VIVS_HI_CLOCK_CONTROL_SOFT_RESET;
539 		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
540 
541 		/* reset GPU isolation. */
542 		control &= ~VIVS_HI_CLOCK_CONTROL_ISOLATE_GPU;
543 		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
544 
545 		/* read idle register. */
546 		idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
547 
548 		/* try resetting again if FE is not idle */
549 		if ((idle & VIVS_HI_IDLE_STATE_FE) == 0) {
550 			dev_dbg(gpu->dev, "FE is not idle\n");
551 			continue;
552 		}
553 
554 		/* read reset register. */
555 		control = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
556 
557 		/* is the GPU idle? */
558 		if (((control & VIVS_HI_CLOCK_CONTROL_IDLE_3D) == 0) ||
559 		    ((control & VIVS_HI_CLOCK_CONTROL_IDLE_2D) == 0)) {
560 			dev_dbg(gpu->dev, "GPU is not idle\n");
561 			continue;
562 		}
563 
564 		/* disable debug registers, as they are not normally needed */
565 		control |= VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS;
566 		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
567 
568 		failed = false;
569 		break;
570 	}
571 
572 	if (failed) {
573 		idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
574 		control = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
575 
576 		dev_err(gpu->dev, "GPU failed to reset: FE %sidle, 3D %sidle, 2D %sidle\n",
577 			idle & VIVS_HI_IDLE_STATE_FE ? "" : "not ",
578 			control & VIVS_HI_CLOCK_CONTROL_IDLE_3D ? "" : "not ",
579 			control & VIVS_HI_CLOCK_CONTROL_IDLE_2D ? "" : "not ");
580 
581 		return -EBUSY;
582 	}
583 
584 	/* We rely on the GPU running, so program the clock */
585 	etnaviv_gpu_update_clock(gpu);
586 
587 	gpu->state = ETNA_GPU_STATE_RESET;
588 	gpu->exec_state = -1;
589 	if (gpu->mmu_context)
590 		etnaviv_iommu_context_put(gpu->mmu_context);
591 	gpu->mmu_context = NULL;
592 
593 	return 0;
594 }
595 
etnaviv_gpu_enable_mlcg(struct etnaviv_gpu * gpu)596 static void etnaviv_gpu_enable_mlcg(struct etnaviv_gpu *gpu)
597 {
598 	u32 pmc, ppc;
599 
600 	/* enable clock gating */
601 	ppc = gpu_read_power(gpu, VIVS_PM_POWER_CONTROLS);
602 	ppc |= VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;
603 
604 	/* Disable stall module clock gating for 4.3.0.1 and 4.3.0.2 revs */
605 	if (gpu->identity.revision == 0x4301 ||
606 	    gpu->identity.revision == 0x4302)
607 		ppc |= VIVS_PM_POWER_CONTROLS_DISABLE_STALL_MODULE_CLOCK_GATING;
608 
609 	gpu_write_power(gpu, VIVS_PM_POWER_CONTROLS, ppc);
610 
611 	pmc = gpu_read_power(gpu, VIVS_PM_MODULE_CONTROLS);
612 
613 	/* Disable PA clock gating for GC400+ without bugfix except for GC420 */
614 	if (gpu->identity.model >= chipModel_GC400 &&
615 	    gpu->identity.model != chipModel_GC420 &&
616 	    !(gpu->identity.minor_features3 & chipMinorFeatures3_BUG_FIXES12))
617 		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PA;
618 
619 	/*
620 	 * Disable PE clock gating on revs < 5.0.0.0 when HZ is
621 	 * present without a bug fix.
622 	 */
623 	if (gpu->identity.revision < 0x5000 &&
624 	    gpu->identity.minor_features0 & chipMinorFeatures0_HZ &&
625 	    !(gpu->identity.minor_features1 &
626 	      chipMinorFeatures1_DISABLE_PE_GATING))
627 		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_PE;
628 
629 	if (gpu->identity.revision < 0x5422)
630 		pmc |= BIT(15); /* Unknown bit */
631 
632 	/* Disable TX clock gating on affected core revisions. */
633 	if (etnaviv_is_model_rev(gpu, GC4000, 0x5222) ||
634 	    etnaviv_is_model_rev(gpu, GC2000, 0x5108) ||
635 	    etnaviv_is_model_rev(gpu, GC7000, 0x6202) ||
636 	    etnaviv_is_model_rev(gpu, GC7000, 0x6203))
637 		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_TX;
638 
639 	/* Disable SE and RA clock gating on affected core revisions. */
640 	if (etnaviv_is_model_rev(gpu, GC7000, 0x6202))
641 		pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_SE |
642 		       VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA;
643 
644 	pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_HZ;
645 	pmc |= VIVS_PM_MODULE_CONTROLS_DISABLE_MODULE_CLOCK_GATING_RA_EZ;
646 
647 	gpu_write_power(gpu, VIVS_PM_MODULE_CONTROLS, pmc);
648 }
649 
etnaviv_gpu_start_fe(struct etnaviv_gpu * gpu,u32 address,u16 prefetch)650 void etnaviv_gpu_start_fe(struct etnaviv_gpu *gpu, u32 address, u16 prefetch)
651 {
652 	gpu_write(gpu, VIVS_FE_COMMAND_ADDRESS, address);
653 	gpu_write(gpu, VIVS_FE_COMMAND_CONTROL,
654 		  VIVS_FE_COMMAND_CONTROL_ENABLE |
655 		  VIVS_FE_COMMAND_CONTROL_PREFETCH(prefetch));
656 
657 	if (gpu->sec_mode == ETNA_SEC_KERNEL) {
658 		gpu_write(gpu, VIVS_MMUv2_SEC_COMMAND_CONTROL,
659 			  VIVS_MMUv2_SEC_COMMAND_CONTROL_ENABLE |
660 			  VIVS_MMUv2_SEC_COMMAND_CONTROL_PREFETCH(prefetch));
661 	}
662 }
663 
etnaviv_gpu_start_fe_idleloop(struct etnaviv_gpu * gpu,struct etnaviv_iommu_context * context)664 static void etnaviv_gpu_start_fe_idleloop(struct etnaviv_gpu *gpu,
665 					  struct etnaviv_iommu_context *context)
666 {
667 	u16 prefetch;
668 	u32 address;
669 
670 	WARN_ON(gpu->state != ETNA_GPU_STATE_INITIALIZED);
671 
672 	/* setup the MMU */
673 	etnaviv_iommu_restore(gpu, context);
674 
675 	/* Start command processor */
676 	prefetch = etnaviv_buffer_init(gpu);
677 	address = etnaviv_cmdbuf_get_va(&gpu->buffer,
678 					&gpu->mmu_context->cmdbuf_mapping);
679 
680 	etnaviv_gpu_start_fe(gpu, address, prefetch);
681 
682 	gpu->state = ETNA_GPU_STATE_RUNNING;
683 }
684 
etnaviv_gpu_setup_pulse_eater(struct etnaviv_gpu * gpu)685 static void etnaviv_gpu_setup_pulse_eater(struct etnaviv_gpu *gpu)
686 {
687 	/*
688 	 * Base value for VIVS_PM_PULSE_EATER register on models where it
689 	 * cannot be read, extracted from vivante kernel driver.
690 	 */
691 	u32 pulse_eater = 0x01590880;
692 
693 	if (etnaviv_is_model_rev(gpu, GC4000, 0x5208) ||
694 	    etnaviv_is_model_rev(gpu, GC4000, 0x5222)) {
695 		pulse_eater |= BIT(23);
696 
697 	}
698 
699 	if (etnaviv_is_model_rev(gpu, GC1000, 0x5039) ||
700 	    etnaviv_is_model_rev(gpu, GC1000, 0x5040)) {
701 		pulse_eater &= ~BIT(16);
702 		pulse_eater |= BIT(17);
703 	}
704 
705 	if ((gpu->identity.revision > 0x5420) &&
706 	    (gpu->identity.features & chipFeatures_PIPE_3D))
707 	{
708 		/* Performance fix: disable internal DFS */
709 		pulse_eater = gpu_read_power(gpu, VIVS_PM_PULSE_EATER);
710 		pulse_eater |= BIT(18);
711 	}
712 
713 	gpu_write_power(gpu, VIVS_PM_PULSE_EATER, pulse_eater);
714 }
715 
etnaviv_gpu_hw_init(struct etnaviv_gpu * gpu)716 static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
717 {
718 	WARN_ON(!(gpu->state == ETNA_GPU_STATE_IDENTIFIED ||
719 		  gpu->state == ETNA_GPU_STATE_RESET));
720 
721 	if ((etnaviv_is_model_rev(gpu, GC320, 0x5007) ||
722 	     etnaviv_is_model_rev(gpu, GC320, 0x5220)) &&
723 	    gpu_read(gpu, VIVS_HI_CHIP_TIME) != 0x2062400) {
724 		u32 mc_memory_debug;
725 
726 		mc_memory_debug = gpu_read(gpu, VIVS_MC_DEBUG_MEMORY) & ~0xff;
727 
728 		if (gpu->identity.revision == 0x5007)
729 			mc_memory_debug |= 0x0c;
730 		else
731 			mc_memory_debug |= 0x08;
732 
733 		gpu_write(gpu, VIVS_MC_DEBUG_MEMORY, mc_memory_debug);
734 	}
735 
736 	/* enable module-level clock gating */
737 	etnaviv_gpu_enable_mlcg(gpu);
738 
739 	/*
740 	 * Update GPU AXI cache atttribute to "cacheable, no allocate".
741 	 * This is necessary to prevent the iMX6 SoC locking up.
742 	 */
743 	gpu_write(gpu, VIVS_HI_AXI_CONFIG,
744 		  VIVS_HI_AXI_CONFIG_AWCACHE(2) |
745 		  VIVS_HI_AXI_CONFIG_ARCACHE(2));
746 
747 	/* GC2000 rev 5108 needs a special bus config */
748 	if (etnaviv_is_model_rev(gpu, GC2000, 0x5108)) {
749 		u32 bus_config = gpu_read(gpu, VIVS_MC_BUS_CONFIG);
750 		bus_config &= ~(VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG__MASK |
751 				VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG__MASK);
752 		bus_config |= VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG(1) |
753 			      VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG(0);
754 		gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
755 	}
756 
757 	if (gpu->sec_mode == ETNA_SEC_KERNEL) {
758 		u32 val = gpu_read(gpu, VIVS_MMUv2_AHB_CONTROL);
759 		val |= VIVS_MMUv2_AHB_CONTROL_NONSEC_ACCESS;
760 		gpu_write(gpu, VIVS_MMUv2_AHB_CONTROL, val);
761 	}
762 
763 	/* setup the pulse eater */
764 	etnaviv_gpu_setup_pulse_eater(gpu);
765 
766 	gpu_write(gpu, VIVS_HI_INTR_ENBL, ~0U);
767 
768 	gpu->state = ETNA_GPU_STATE_INITIALIZED;
769 }
770 
etnaviv_gpu_init(struct etnaviv_gpu * gpu)771 int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
772 {
773 	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
774 	dma_addr_t cmdbuf_paddr;
775 	int ret, i;
776 
777 	ret = pm_runtime_get_sync(gpu->dev);
778 	if (ret < 0) {
779 		dev_err(gpu->dev, "Failed to enable GPU power domain\n");
780 		goto pm_put;
781 	}
782 
783 	etnaviv_hw_identify(gpu);
784 
785 	if (gpu->identity.model == 0) {
786 		dev_err(gpu->dev, "Unknown GPU model\n");
787 		ret = -ENXIO;
788 		goto fail;
789 	}
790 
791 	if (gpu->identity.nn_core_count > 0)
792 		dev_warn(gpu->dev, "etnaviv has been instantiated on a NPU, "
793                                    "for which the UAPI is still experimental\n");
794 
795 	/* Exclude VG cores with FE2.0 */
796 	if (gpu->identity.features & chipFeatures_PIPE_VG &&
797 	    gpu->identity.features & chipFeatures_FE20) {
798 		dev_info(gpu->dev, "Ignoring GPU with VG and FE2.0\n");
799 		ret = -ENXIO;
800 		goto fail;
801 	}
802 
803 	/*
804 	 * On cores with security features supported, we claim control over the
805 	 * security states.
806 	 */
807 	if ((gpu->identity.minor_features7 & chipMinorFeatures7_BIT_SECURITY) &&
808 	    (gpu->identity.minor_features10 & chipMinorFeatures10_SECURITY_AHB))
809 		gpu->sec_mode = ETNA_SEC_KERNEL;
810 
811 	gpu->state = ETNA_GPU_STATE_IDENTIFIED;
812 
813 	ret = etnaviv_hw_reset(gpu);
814 	if (ret) {
815 		dev_err(gpu->dev, "GPU reset failed\n");
816 		goto fail;
817 	}
818 
819 	ret = etnaviv_iommu_global_init(gpu);
820 	if (ret)
821 		goto fail;
822 
823 	/*
824 	 * If the GPU is part of a system with DMA addressing limitations,
825 	 * request pages for our SHM backend buffers from the DMA32 zone to
826 	 * hopefully avoid performance killing SWIOTLB bounce buffering.
827 	 */
828 	if (dma_addressing_limited(gpu->dev))
829 		priv->shm_gfp_mask |= GFP_DMA32;
830 
831 	/* Create buffer: */
832 	ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &gpu->buffer,
833 				  PAGE_SIZE);
834 	if (ret) {
835 		dev_err(gpu->dev, "could not create command buffer\n");
836 		goto fail;
837 	}
838 
839 	/*
840 	 * Set the GPU linear window to cover the cmdbuf region, as the GPU
841 	 * won't be able to start execution otherwise. The alignment to 128M is
842 	 * chosen arbitrarily but helps in debugging, as the MMU offset
843 	 * calculations are much more straight forward this way.
844 	 *
845 	 * On MC1.0 cores the linear window offset is ignored by the TS engine,
846 	 * leading to inconsistent memory views. Avoid using the offset on those
847 	 * cores if possible, otherwise disable the TS feature.
848 	 */
849 	cmdbuf_paddr = ALIGN_DOWN(etnaviv_cmdbuf_get_pa(&gpu->buffer), SZ_128M);
850 
851 	if (!(gpu->identity.features & chipFeatures_PIPE_3D) ||
852 	    (gpu->identity.minor_features0 & chipMinorFeatures0_MC20)) {
853 		if (cmdbuf_paddr >= SZ_2G)
854 			priv->mmu_global->memory_base = SZ_2G;
855 		else
856 			priv->mmu_global->memory_base = cmdbuf_paddr;
857 	} else if (cmdbuf_paddr + SZ_128M >= SZ_2G) {
858 		dev_info(gpu->dev,
859 			 "Need to move linear window on MC1.0, disabling TS\n");
860 		gpu->identity.features &= ~chipFeatures_FAST_CLEAR;
861 		priv->mmu_global->memory_base = SZ_2G;
862 	}
863 
864 	/* Setup event management */
865 	spin_lock_init(&gpu->event_spinlock);
866 	init_completion(&gpu->event_free);
867 	bitmap_zero(gpu->event_bitmap, ETNA_NR_EVENTS);
868 	for (i = 0; i < ARRAY_SIZE(gpu->event); i++)
869 		complete(&gpu->event_free);
870 
871 	/* Now program the hardware */
872 	mutex_lock(&gpu->lock);
873 	etnaviv_gpu_hw_init(gpu);
874 	mutex_unlock(&gpu->lock);
875 
876 	pm_runtime_mark_last_busy(gpu->dev);
877 	pm_runtime_put_autosuspend(gpu->dev);
878 
879 	return 0;
880 
881 fail:
882 	pm_runtime_mark_last_busy(gpu->dev);
883 pm_put:
884 	pm_runtime_put_autosuspend(gpu->dev);
885 
886 	return ret;
887 }
888 
889 #ifdef CONFIG_DEBUG_FS
890 struct dma_debug {
891 	u32 address[2];
892 	u32 state[2];
893 };
894 
verify_dma(struct etnaviv_gpu * gpu,struct dma_debug * debug)895 static void verify_dma(struct etnaviv_gpu *gpu, struct dma_debug *debug)
896 {
897 	u32 i;
898 
899 	debug->address[0] = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
900 	debug->state[0]   = gpu_read(gpu, VIVS_FE_DMA_DEBUG_STATE);
901 
902 	for (i = 0; i < 500; i++) {
903 		debug->address[1] = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
904 		debug->state[1]   = gpu_read(gpu, VIVS_FE_DMA_DEBUG_STATE);
905 
906 		if (debug->address[0] != debug->address[1])
907 			break;
908 
909 		if (debug->state[0] != debug->state[1])
910 			break;
911 	}
912 }
913 
etnaviv_gpu_debugfs(struct etnaviv_gpu * gpu,struct seq_file * m)914 int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m)
915 {
916 	struct dma_debug debug;
917 	u32 dma_lo, dma_hi, axi, idle;
918 	int ret;
919 
920 	seq_printf(m, "%s Status:\n", dev_name(gpu->dev));
921 
922 	ret = pm_runtime_get_sync(gpu->dev);
923 	if (ret < 0)
924 		goto pm_put;
925 
926 	dma_lo = gpu_read(gpu, VIVS_FE_DMA_LOW);
927 	dma_hi = gpu_read(gpu, VIVS_FE_DMA_HIGH);
928 	axi = gpu_read(gpu, VIVS_HI_AXI_STATUS);
929 	idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
930 
931 	verify_dma(gpu, &debug);
932 
933 	seq_puts(m, "\tidentity\n");
934 	seq_printf(m, "\t model: 0x%x\n", gpu->identity.model);
935 	seq_printf(m, "\t revision: 0x%x\n", gpu->identity.revision);
936 	seq_printf(m, "\t product_id: 0x%x\n", gpu->identity.product_id);
937 	seq_printf(m, "\t customer_id: 0x%x\n", gpu->identity.customer_id);
938 	seq_printf(m, "\t eco_id: 0x%x\n", gpu->identity.eco_id);
939 
940 	seq_puts(m, "\tfeatures\n");
941 	seq_printf(m, "\t major_features: 0x%08x\n",
942 		   gpu->identity.features);
943 	seq_printf(m, "\t minor_features0: 0x%08x\n",
944 		   gpu->identity.minor_features0);
945 	seq_printf(m, "\t minor_features1: 0x%08x\n",
946 		   gpu->identity.minor_features1);
947 	seq_printf(m, "\t minor_features2: 0x%08x\n",
948 		   gpu->identity.minor_features2);
949 	seq_printf(m, "\t minor_features3: 0x%08x\n",
950 		   gpu->identity.minor_features3);
951 	seq_printf(m, "\t minor_features4: 0x%08x\n",
952 		   gpu->identity.minor_features4);
953 	seq_printf(m, "\t minor_features5: 0x%08x\n",
954 		   gpu->identity.minor_features5);
955 	seq_printf(m, "\t minor_features6: 0x%08x\n",
956 		   gpu->identity.minor_features6);
957 	seq_printf(m, "\t minor_features7: 0x%08x\n",
958 		   gpu->identity.minor_features7);
959 	seq_printf(m, "\t minor_features8: 0x%08x\n",
960 		   gpu->identity.minor_features8);
961 	seq_printf(m, "\t minor_features9: 0x%08x\n",
962 		   gpu->identity.minor_features9);
963 	seq_printf(m, "\t minor_features10: 0x%08x\n",
964 		   gpu->identity.minor_features10);
965 	seq_printf(m, "\t minor_features11: 0x%08x\n",
966 		   gpu->identity.minor_features11);
967 
968 	seq_puts(m, "\tspecs\n");
969 	seq_printf(m, "\t stream_count:  %d\n",
970 			gpu->identity.stream_count);
971 	seq_printf(m, "\t register_max: %d\n",
972 			gpu->identity.register_max);
973 	seq_printf(m, "\t thread_count: %d\n",
974 			gpu->identity.thread_count);
975 	seq_printf(m, "\t vertex_cache_size: %d\n",
976 			gpu->identity.vertex_cache_size);
977 	seq_printf(m, "\t shader_core_count: %d\n",
978 			gpu->identity.shader_core_count);
979 	seq_printf(m, "\t nn_core_count: %d\n",
980 			gpu->identity.nn_core_count);
981 	seq_printf(m, "\t pixel_pipes: %d\n",
982 			gpu->identity.pixel_pipes);
983 	seq_printf(m, "\t vertex_output_buffer_size: %d\n",
984 			gpu->identity.vertex_output_buffer_size);
985 	seq_printf(m, "\t buffer_size: %d\n",
986 			gpu->identity.buffer_size);
987 	seq_printf(m, "\t instruction_count: %d\n",
988 			gpu->identity.instruction_count);
989 	seq_printf(m, "\t num_constants: %d\n",
990 			gpu->identity.num_constants);
991 	seq_printf(m, "\t varyings_count: %d\n",
992 			gpu->identity.varyings_count);
993 
994 	seq_printf(m, "\taxi: 0x%08x\n", axi);
995 	seq_printf(m, "\tidle: 0x%08x\n", idle);
996 	idle |= ~gpu->idle_mask & ~VIVS_HI_IDLE_STATE_AXI_LP;
997 	if ((idle & VIVS_HI_IDLE_STATE_FE) == 0)
998 		seq_puts(m, "\t FE is not idle\n");
999 	if ((idle & VIVS_HI_IDLE_STATE_DE) == 0)
1000 		seq_puts(m, "\t DE is not idle\n");
1001 	if ((idle & VIVS_HI_IDLE_STATE_PE) == 0)
1002 		seq_puts(m, "\t PE is not idle\n");
1003 	if ((idle & VIVS_HI_IDLE_STATE_SH) == 0)
1004 		seq_puts(m, "\t SH is not idle\n");
1005 	if ((idle & VIVS_HI_IDLE_STATE_PA) == 0)
1006 		seq_puts(m, "\t PA is not idle\n");
1007 	if ((idle & VIVS_HI_IDLE_STATE_SE) == 0)
1008 		seq_puts(m, "\t SE is not idle\n");
1009 	if ((idle & VIVS_HI_IDLE_STATE_RA) == 0)
1010 		seq_puts(m, "\t RA is not idle\n");
1011 	if ((idle & VIVS_HI_IDLE_STATE_TX) == 0)
1012 		seq_puts(m, "\t TX is not idle\n");
1013 	if ((idle & VIVS_HI_IDLE_STATE_VG) == 0)
1014 		seq_puts(m, "\t VG is not idle\n");
1015 	if ((idle & VIVS_HI_IDLE_STATE_IM) == 0)
1016 		seq_puts(m, "\t IM is not idle\n");
1017 	if ((idle & VIVS_HI_IDLE_STATE_FP) == 0)
1018 		seq_puts(m, "\t FP is not idle\n");
1019 	if ((idle & VIVS_HI_IDLE_STATE_TS) == 0)
1020 		seq_puts(m, "\t TS is not idle\n");
1021 	if ((idle & VIVS_HI_IDLE_STATE_BL) == 0)
1022 		seq_puts(m, "\t BL is not idle\n");
1023 	if ((idle & VIVS_HI_IDLE_STATE_ASYNCFE) == 0)
1024 		seq_puts(m, "\t ASYNCFE is not idle\n");
1025 	if ((idle & VIVS_HI_IDLE_STATE_MC) == 0)
1026 		seq_puts(m, "\t MC is not idle\n");
1027 	if ((idle & VIVS_HI_IDLE_STATE_PPA) == 0)
1028 		seq_puts(m, "\t PPA is not idle\n");
1029 	if ((idle & VIVS_HI_IDLE_STATE_WD) == 0)
1030 		seq_puts(m, "\t WD is not idle\n");
1031 	if ((idle & VIVS_HI_IDLE_STATE_NN) == 0)
1032 		seq_puts(m, "\t NN is not idle\n");
1033 	if ((idle & VIVS_HI_IDLE_STATE_TP) == 0)
1034 		seq_puts(m, "\t TP is not idle\n");
1035 	if (idle & VIVS_HI_IDLE_STATE_AXI_LP)
1036 		seq_puts(m, "\t AXI low power mode\n");
1037 
1038 	if (gpu->identity.features & chipFeatures_DEBUG_MODE) {
1039 		u32 read0 = gpu_read(gpu, VIVS_MC_DEBUG_READ0);
1040 		u32 read1 = gpu_read(gpu, VIVS_MC_DEBUG_READ1);
1041 		u32 write = gpu_read(gpu, VIVS_MC_DEBUG_WRITE);
1042 
1043 		seq_puts(m, "\tMC\n");
1044 		seq_printf(m, "\t read0: 0x%08x\n", read0);
1045 		seq_printf(m, "\t read1: 0x%08x\n", read1);
1046 		seq_printf(m, "\t write: 0x%08x\n", write);
1047 	}
1048 
1049 	seq_puts(m, "\tDMA ");
1050 
1051 	if (debug.address[0] == debug.address[1] &&
1052 	    debug.state[0] == debug.state[1]) {
1053 		seq_puts(m, "seems to be stuck\n");
1054 	} else if (debug.address[0] == debug.address[1]) {
1055 		seq_puts(m, "address is constant\n");
1056 	} else {
1057 		seq_puts(m, "is running\n");
1058 	}
1059 
1060 	seq_printf(m, "\t address 0: 0x%08x\n", debug.address[0]);
1061 	seq_printf(m, "\t address 1: 0x%08x\n", debug.address[1]);
1062 	seq_printf(m, "\t state 0: 0x%08x\n", debug.state[0]);
1063 	seq_printf(m, "\t state 1: 0x%08x\n", debug.state[1]);
1064 	seq_printf(m, "\t last fetch 64 bit word: 0x%08x 0x%08x\n",
1065 		   dma_lo, dma_hi);
1066 
1067 	ret = 0;
1068 
1069 	pm_runtime_mark_last_busy(gpu->dev);
1070 pm_put:
1071 	pm_runtime_put_autosuspend(gpu->dev);
1072 
1073 	return ret;
1074 }
1075 #endif
1076 
1077 /* fence object management */
1078 struct etnaviv_fence {
1079 	struct etnaviv_gpu *gpu;
1080 	struct dma_fence base;
1081 };
1082 
to_etnaviv_fence(struct dma_fence * fence)1083 static inline struct etnaviv_fence *to_etnaviv_fence(struct dma_fence *fence)
1084 {
1085 	return container_of(fence, struct etnaviv_fence, base);
1086 }
1087 
etnaviv_fence_get_driver_name(struct dma_fence * fence)1088 static const char *etnaviv_fence_get_driver_name(struct dma_fence *fence)
1089 {
1090 	return "etnaviv";
1091 }
1092 
etnaviv_fence_get_timeline_name(struct dma_fence * fence)1093 static const char *etnaviv_fence_get_timeline_name(struct dma_fence *fence)
1094 {
1095 	struct etnaviv_fence *f = to_etnaviv_fence(fence);
1096 
1097 	return dev_name(f->gpu->dev);
1098 }
1099 
etnaviv_fence_signaled(struct dma_fence * fence)1100 static bool etnaviv_fence_signaled(struct dma_fence *fence)
1101 {
1102 	struct etnaviv_fence *f = to_etnaviv_fence(fence);
1103 
1104 	return (s32)(f->gpu->completed_fence - f->base.seqno) >= 0;
1105 }
1106 
etnaviv_fence_release(struct dma_fence * fence)1107 static void etnaviv_fence_release(struct dma_fence *fence)
1108 {
1109 	struct etnaviv_fence *f = to_etnaviv_fence(fence);
1110 
1111 	kfree_rcu(f, base.rcu);
1112 }
1113 
1114 static const struct dma_fence_ops etnaviv_fence_ops = {
1115 	.get_driver_name = etnaviv_fence_get_driver_name,
1116 	.get_timeline_name = etnaviv_fence_get_timeline_name,
1117 	.signaled = etnaviv_fence_signaled,
1118 	.release = etnaviv_fence_release,
1119 };
1120 
etnaviv_gpu_fence_alloc(struct etnaviv_gpu * gpu)1121 static struct dma_fence *etnaviv_gpu_fence_alloc(struct etnaviv_gpu *gpu)
1122 {
1123 	struct etnaviv_fence *f;
1124 
1125 	/*
1126 	 * GPU lock must already be held, otherwise fence completion order might
1127 	 * not match the seqno order assigned here.
1128 	 */
1129 	lockdep_assert_held(&gpu->lock);
1130 
1131 	f = kzalloc(sizeof(*f), GFP_KERNEL);
1132 	if (!f)
1133 		return NULL;
1134 
1135 	f->gpu = gpu;
1136 
1137 	dma_fence_init(&f->base, &etnaviv_fence_ops, &gpu->fence_spinlock,
1138 		       gpu->fence_context, ++gpu->next_fence);
1139 
1140 	return &f->base;
1141 }
1142 
1143 /* returns true if fence a comes after fence b */
fence_after(u32 a,u32 b)1144 static inline bool fence_after(u32 a, u32 b)
1145 {
1146 	return (s32)(a - b) > 0;
1147 }
1148 
1149 /*
1150  * event management:
1151  */
1152 
event_alloc(struct etnaviv_gpu * gpu,unsigned nr_events,unsigned int * events)1153 static int event_alloc(struct etnaviv_gpu *gpu, unsigned nr_events,
1154 	unsigned int *events)
1155 {
1156 	unsigned long timeout = msecs_to_jiffies(10 * 10000);
1157 	unsigned i, acquired = 0, rpm_count = 0;
1158 	int ret;
1159 
1160 	for (i = 0; i < nr_events; i++) {
1161 		unsigned long remaining;
1162 
1163 		remaining = wait_for_completion_timeout(&gpu->event_free, timeout);
1164 
1165 		if (!remaining) {
1166 			dev_err(gpu->dev, "wait_for_completion_timeout failed");
1167 			ret = -EBUSY;
1168 			goto out;
1169 		}
1170 
1171 		acquired++;
1172 		timeout = remaining;
1173 	}
1174 
1175 	spin_lock(&gpu->event_spinlock);
1176 
1177 	for (i = 0; i < nr_events; i++) {
1178 		int event = find_first_zero_bit(gpu->event_bitmap, ETNA_NR_EVENTS);
1179 
1180 		events[i] = event;
1181 		memset(&gpu->event[event], 0, sizeof(struct etnaviv_event));
1182 		set_bit(event, gpu->event_bitmap);
1183 	}
1184 
1185 	spin_unlock(&gpu->event_spinlock);
1186 
1187 	for (i = 0; i < nr_events; i++) {
1188 		ret = pm_runtime_resume_and_get(gpu->dev);
1189 		if (ret)
1190 			goto out_rpm;
1191 		rpm_count++;
1192 	}
1193 
1194 	return 0;
1195 
1196 out_rpm:
1197 	for (i = 0; i < rpm_count; i++)
1198 		pm_runtime_put_autosuspend(gpu->dev);
1199 out:
1200 	for (i = 0; i < acquired; i++)
1201 		complete(&gpu->event_free);
1202 
1203 	return ret;
1204 }
1205 
event_free(struct etnaviv_gpu * gpu,unsigned int event)1206 static void event_free(struct etnaviv_gpu *gpu, unsigned int event)
1207 {
1208 	if (!test_bit(event, gpu->event_bitmap)) {
1209 		dev_warn(gpu->dev, "event %u is already marked as free",
1210 			 event);
1211 	} else {
1212 		clear_bit(event, gpu->event_bitmap);
1213 		complete(&gpu->event_free);
1214 	}
1215 
1216 	pm_runtime_put_autosuspend(gpu->dev);
1217 }
1218 
1219 /*
1220  * Cmdstream submission/retirement:
1221  */
etnaviv_gpu_wait_fence_interruptible(struct etnaviv_gpu * gpu,u32 id,struct drm_etnaviv_timespec * timeout)1222 int etnaviv_gpu_wait_fence_interruptible(struct etnaviv_gpu *gpu,
1223 	u32 id, struct drm_etnaviv_timespec *timeout)
1224 {
1225 	struct dma_fence *fence;
1226 	int ret;
1227 
1228 	/*
1229 	 * Look up the fence and take a reference. We might still find a fence
1230 	 * whose refcount has already dropped to zero. dma_fence_get_rcu
1231 	 * pretends we didn't find a fence in that case.
1232 	 */
1233 	rcu_read_lock();
1234 	fence = xa_load(&gpu->user_fences, id);
1235 	if (fence)
1236 		fence = dma_fence_get_rcu(fence);
1237 	rcu_read_unlock();
1238 
1239 	if (!fence)
1240 		return 0;
1241 
1242 	if (!timeout) {
1243 		/* No timeout was requested: just test for completion */
1244 		ret = dma_fence_is_signaled(fence) ? 0 : -EBUSY;
1245 	} else {
1246 		unsigned long remaining = etnaviv_timeout_to_jiffies(timeout);
1247 
1248 		ret = dma_fence_wait_timeout(fence, true, remaining);
1249 		if (ret == 0)
1250 			ret = -ETIMEDOUT;
1251 		else if (ret != -ERESTARTSYS)
1252 			ret = 0;
1253 
1254 	}
1255 
1256 	dma_fence_put(fence);
1257 	return ret;
1258 }
1259 
1260 /*
1261  * Wait for an object to become inactive.  This, on it's own, is not race
1262  * free: the object is moved by the scheduler off the active list, and
1263  * then the iova is put.  Moreover, the object could be re-submitted just
1264  * after we notice that it's become inactive.
1265  *
1266  * Although the retirement happens under the gpu lock, we don't want to hold
1267  * that lock in this function while waiting.
1268  */
etnaviv_gpu_wait_obj_inactive(struct etnaviv_gpu * gpu,struct etnaviv_gem_object * etnaviv_obj,struct drm_etnaviv_timespec * timeout)1269 int etnaviv_gpu_wait_obj_inactive(struct etnaviv_gpu *gpu,
1270 	struct etnaviv_gem_object *etnaviv_obj,
1271 	struct drm_etnaviv_timespec *timeout)
1272 {
1273 	unsigned long remaining;
1274 	long ret;
1275 
1276 	if (!timeout)
1277 		return !is_active(etnaviv_obj) ? 0 : -EBUSY;
1278 
1279 	remaining = etnaviv_timeout_to_jiffies(timeout);
1280 
1281 	ret = wait_event_interruptible_timeout(gpu->fence_event,
1282 					       !is_active(etnaviv_obj),
1283 					       remaining);
1284 	if (ret > 0)
1285 		return 0;
1286 	else if (ret == -ERESTARTSYS)
1287 		return -ERESTARTSYS;
1288 	else
1289 		return -ETIMEDOUT;
1290 }
1291 
sync_point_perfmon_sample(struct etnaviv_gpu * gpu,struct etnaviv_event * event,unsigned int flags)1292 static void sync_point_perfmon_sample(struct etnaviv_gpu *gpu,
1293 	struct etnaviv_event *event, unsigned int flags)
1294 {
1295 	const struct etnaviv_gem_submit *submit = event->submit;
1296 	unsigned int i;
1297 
1298 	for (i = 0; i < submit->nr_pmrs; i++) {
1299 		const struct etnaviv_perfmon_request *pmr = submit->pmrs + i;
1300 
1301 		if (pmr->flags == flags)
1302 			etnaviv_perfmon_process(gpu, pmr, submit->exec_state);
1303 	}
1304 }
1305 
sync_point_perfmon_sample_pre(struct etnaviv_gpu * gpu,struct etnaviv_event * event)1306 static void sync_point_perfmon_sample_pre(struct etnaviv_gpu *gpu,
1307 	struct etnaviv_event *event)
1308 {
1309 	u32 val;
1310 
1311 	/* disable clock gating */
1312 	val = gpu_read_power(gpu, VIVS_PM_POWER_CONTROLS);
1313 	val &= ~VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;
1314 	gpu_write_power(gpu, VIVS_PM_POWER_CONTROLS, val);
1315 
1316 	/* enable debug register */
1317 	val = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
1318 	val &= ~VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS;
1319 	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, val);
1320 
1321 	sync_point_perfmon_sample(gpu, event, ETNA_PM_PROCESS_PRE);
1322 }
1323 
sync_point_perfmon_sample_post(struct etnaviv_gpu * gpu,struct etnaviv_event * event)1324 static void sync_point_perfmon_sample_post(struct etnaviv_gpu *gpu,
1325 	struct etnaviv_event *event)
1326 {
1327 	const struct etnaviv_gem_submit *submit = event->submit;
1328 	unsigned int i;
1329 	u32 val;
1330 
1331 	sync_point_perfmon_sample(gpu, event, ETNA_PM_PROCESS_POST);
1332 
1333 	for (i = 0; i < submit->nr_pmrs; i++) {
1334 		const struct etnaviv_perfmon_request *pmr = submit->pmrs + i;
1335 
1336 		*pmr->bo_vma = pmr->sequence;
1337 	}
1338 
1339 	/* disable debug register */
1340 	val = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
1341 	val |= VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS;
1342 	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, val);
1343 
1344 	/* enable clock gating */
1345 	val = gpu_read_power(gpu, VIVS_PM_POWER_CONTROLS);
1346 	val |= VIVS_PM_POWER_CONTROLS_ENABLE_MODULE_CLOCK_GATING;
1347 	gpu_write_power(gpu, VIVS_PM_POWER_CONTROLS, val);
1348 }
1349 
1350 
1351 /* add bo's to gpu's ring, and kick gpu: */
etnaviv_gpu_submit(struct etnaviv_gem_submit * submit)1352 struct dma_fence *etnaviv_gpu_submit(struct etnaviv_gem_submit *submit)
1353 {
1354 	struct etnaviv_gpu *gpu = submit->gpu;
1355 	struct dma_fence *gpu_fence;
1356 	unsigned int i, nr_events = 1, event[3];
1357 	int ret;
1358 
1359 	/*
1360 	 * if there are performance monitor requests we need to have
1361 	 * - a sync point to re-configure gpu and process ETNA_PM_PROCESS_PRE
1362 	 *   requests.
1363 	 * - a sync point to re-configure gpu, process ETNA_PM_PROCESS_POST requests
1364 	 *   and update the sequence number for userspace.
1365 	 */
1366 	if (submit->nr_pmrs)
1367 		nr_events = 3;
1368 
1369 	ret = event_alloc(gpu, nr_events, event);
1370 	if (ret) {
1371 		DRM_ERROR("no free events\n");
1372 		pm_runtime_put_noidle(gpu->dev);
1373 		return NULL;
1374 	}
1375 
1376 	mutex_lock(&gpu->lock);
1377 
1378 	gpu_fence = etnaviv_gpu_fence_alloc(gpu);
1379 	if (!gpu_fence) {
1380 		for (i = 0; i < nr_events; i++)
1381 			event_free(gpu, event[i]);
1382 
1383 		goto out_unlock;
1384 	}
1385 
1386 	if (gpu->state == ETNA_GPU_STATE_INITIALIZED)
1387 		etnaviv_gpu_start_fe_idleloop(gpu, submit->mmu_context);
1388 
1389 	if (submit->prev_mmu_context)
1390 		etnaviv_iommu_context_put(submit->prev_mmu_context);
1391 	submit->prev_mmu_context = etnaviv_iommu_context_get(gpu->mmu_context);
1392 
1393 	if (submit->nr_pmrs) {
1394 		gpu->event[event[1]].sync_point = &sync_point_perfmon_sample_pre;
1395 		kref_get(&submit->refcount);
1396 		gpu->event[event[1]].submit = submit;
1397 		etnaviv_sync_point_queue(gpu, event[1]);
1398 	}
1399 
1400 	gpu->event[event[0]].fence = gpu_fence;
1401 	submit->cmdbuf.user_size = submit->cmdbuf.size - 8;
1402 	etnaviv_buffer_queue(gpu, submit->exec_state, submit->mmu_context,
1403 			     event[0], &submit->cmdbuf);
1404 
1405 	if (submit->nr_pmrs) {
1406 		gpu->event[event[2]].sync_point = &sync_point_perfmon_sample_post;
1407 		kref_get(&submit->refcount);
1408 		gpu->event[event[2]].submit = submit;
1409 		etnaviv_sync_point_queue(gpu, event[2]);
1410 	}
1411 
1412 out_unlock:
1413 	mutex_unlock(&gpu->lock);
1414 
1415 	return gpu_fence;
1416 }
1417 
sync_point_worker(struct work_struct * work)1418 static void sync_point_worker(struct work_struct *work)
1419 {
1420 	struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
1421 					       sync_point_work);
1422 	struct etnaviv_event *event = &gpu->event[gpu->sync_point_event];
1423 	u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
1424 
1425 	event->sync_point(gpu, event);
1426 	etnaviv_submit_put(event->submit);
1427 	event_free(gpu, gpu->sync_point_event);
1428 
1429 	/* restart FE last to avoid GPU and IRQ racing against this worker */
1430 	etnaviv_gpu_start_fe(gpu, addr + 2, 2);
1431 }
1432 
etnaviv_gpu_recover_hang(struct etnaviv_gem_submit * submit)1433 void etnaviv_gpu_recover_hang(struct etnaviv_gem_submit *submit)
1434 {
1435 	struct etnaviv_gpu *gpu = submit->gpu;
1436 	char *comm = NULL, *cmd = NULL;
1437 	struct task_struct *task;
1438 	unsigned int i;
1439 
1440 	dev_err(gpu->dev, "recover hung GPU!\n");
1441 
1442 	task = get_pid_task(submit->pid, PIDTYPE_PID);
1443 	if (task) {
1444 		comm = kstrdup(task->comm, GFP_KERNEL);
1445 		cmd = kstrdup_quotable_cmdline(task, GFP_KERNEL);
1446 		put_task_struct(task);
1447 	}
1448 
1449 	if (comm && cmd)
1450 		dev_err(gpu->dev, "offending task: %s (%s)\n", comm, cmd);
1451 
1452 	kfree(cmd);
1453 	kfree(comm);
1454 
1455 	if (pm_runtime_get_sync(gpu->dev) < 0)
1456 		goto pm_put;
1457 
1458 	mutex_lock(&gpu->lock);
1459 
1460 	etnaviv_hw_reset(gpu);
1461 
1462 	/* complete all events, the GPU won't do it after the reset */
1463 	spin_lock(&gpu->event_spinlock);
1464 	for_each_set_bit(i, gpu->event_bitmap, ETNA_NR_EVENTS)
1465 		event_free(gpu, i);
1466 	spin_unlock(&gpu->event_spinlock);
1467 
1468 	etnaviv_gpu_hw_init(gpu);
1469 
1470 	mutex_unlock(&gpu->lock);
1471 	pm_runtime_mark_last_busy(gpu->dev);
1472 pm_put:
1473 	pm_runtime_put_autosuspend(gpu->dev);
1474 }
1475 
dump_mmu_fault(struct etnaviv_gpu * gpu)1476 static void dump_mmu_fault(struct etnaviv_gpu *gpu)
1477 {
1478 	static const char *fault_reasons[] = {
1479 		"slave not present",
1480 		"page not present",
1481 		"write violation",
1482 		"out of bounds",
1483 		"read security violation",
1484 		"write security violation",
1485 	};
1486 
1487 	u32 status_reg, status;
1488 	int i;
1489 
1490 	if (gpu->sec_mode == ETNA_SEC_NONE)
1491 		status_reg = VIVS_MMUv2_STATUS;
1492 	else
1493 		status_reg = VIVS_MMUv2_SEC_STATUS;
1494 
1495 	status = gpu_read(gpu, status_reg);
1496 	dev_err_ratelimited(gpu->dev, "MMU fault status 0x%08x\n", status);
1497 
1498 	for (i = 0; i < 4; i++) {
1499 		const char *reason = "unknown";
1500 		u32 address_reg;
1501 		u32 mmu_status;
1502 
1503 		mmu_status = (status >> (i * 4)) & VIVS_MMUv2_STATUS_EXCEPTION0__MASK;
1504 		if (!mmu_status)
1505 			continue;
1506 
1507 		if ((mmu_status - 1) < ARRAY_SIZE(fault_reasons))
1508 			reason = fault_reasons[mmu_status - 1];
1509 
1510 		if (gpu->sec_mode == ETNA_SEC_NONE)
1511 			address_reg = VIVS_MMUv2_EXCEPTION_ADDR(i);
1512 		else
1513 			address_reg = VIVS_MMUv2_SEC_EXCEPTION_ADDR;
1514 
1515 		dev_err_ratelimited(gpu->dev,
1516 				    "MMU %d fault (%s) addr 0x%08x\n",
1517 				    i, reason, gpu_read(gpu, address_reg));
1518 	}
1519 }
1520 
irq_handler(int irq,void * data)1521 static irqreturn_t irq_handler(int irq, void *data)
1522 {
1523 	struct etnaviv_gpu *gpu = data;
1524 	irqreturn_t ret = IRQ_NONE;
1525 
1526 	u32 intr = gpu_read(gpu, VIVS_HI_INTR_ACKNOWLEDGE);
1527 
1528 	if (intr != 0) {
1529 		int event;
1530 
1531 		pm_runtime_mark_last_busy(gpu->dev);
1532 
1533 		dev_dbg(gpu->dev, "intr 0x%08x\n", intr);
1534 
1535 		if (intr & VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR) {
1536 			dev_err(gpu->dev, "AXI bus error\n");
1537 			intr &= ~VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR;
1538 		}
1539 
1540 		if (intr & VIVS_HI_INTR_ACKNOWLEDGE_MMU_EXCEPTION) {
1541 			dump_mmu_fault(gpu);
1542 			gpu->state = ETNA_GPU_STATE_FAULT;
1543 			drm_sched_fault(&gpu->sched);
1544 			intr &= ~VIVS_HI_INTR_ACKNOWLEDGE_MMU_EXCEPTION;
1545 		}
1546 
1547 		while ((event = ffs(intr)) != 0) {
1548 			struct dma_fence *fence;
1549 
1550 			event -= 1;
1551 
1552 			intr &= ~(1 << event);
1553 
1554 			dev_dbg(gpu->dev, "event %u\n", event);
1555 
1556 			if (gpu->event[event].sync_point) {
1557 				gpu->sync_point_event = event;
1558 				queue_work(gpu->wq, &gpu->sync_point_work);
1559 			}
1560 
1561 			fence = gpu->event[event].fence;
1562 			if (!fence)
1563 				continue;
1564 
1565 			gpu->event[event].fence = NULL;
1566 
1567 			/*
1568 			 * Events can be processed out of order.  Eg,
1569 			 * - allocate and queue event 0
1570 			 * - allocate event 1
1571 			 * - event 0 completes, we process it
1572 			 * - allocate and queue event 0
1573 			 * - event 1 and event 0 complete
1574 			 * we can end up processing event 0 first, then 1.
1575 			 */
1576 			if (fence_after(fence->seqno, gpu->completed_fence))
1577 				gpu->completed_fence = fence->seqno;
1578 			dma_fence_signal(fence);
1579 
1580 			event_free(gpu, event);
1581 		}
1582 
1583 		ret = IRQ_HANDLED;
1584 	}
1585 
1586 	return ret;
1587 }
1588 
etnaviv_gpu_clk_enable(struct etnaviv_gpu * gpu)1589 static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
1590 {
1591 	int ret;
1592 
1593 	ret = clk_prepare_enable(gpu->clk_reg);
1594 	if (ret)
1595 		return ret;
1596 
1597 	ret = clk_prepare_enable(gpu->clk_bus);
1598 	if (ret)
1599 		goto disable_clk_reg;
1600 
1601 	ret = clk_prepare_enable(gpu->clk_core);
1602 	if (ret)
1603 		goto disable_clk_bus;
1604 
1605 	ret = clk_prepare_enable(gpu->clk_shader);
1606 	if (ret)
1607 		goto disable_clk_core;
1608 
1609 	return 0;
1610 
1611 disable_clk_core:
1612 	clk_disable_unprepare(gpu->clk_core);
1613 disable_clk_bus:
1614 	clk_disable_unprepare(gpu->clk_bus);
1615 disable_clk_reg:
1616 	clk_disable_unprepare(gpu->clk_reg);
1617 
1618 	return ret;
1619 }
1620 
etnaviv_gpu_clk_disable(struct etnaviv_gpu * gpu)1621 static int etnaviv_gpu_clk_disable(struct etnaviv_gpu *gpu)
1622 {
1623 	clk_disable_unprepare(gpu->clk_shader);
1624 	clk_disable_unprepare(gpu->clk_core);
1625 	clk_disable_unprepare(gpu->clk_bus);
1626 	clk_disable_unprepare(gpu->clk_reg);
1627 
1628 	return 0;
1629 }
1630 
etnaviv_gpu_wait_idle(struct etnaviv_gpu * gpu,unsigned int timeout_ms)1631 int etnaviv_gpu_wait_idle(struct etnaviv_gpu *gpu, unsigned int timeout_ms)
1632 {
1633 	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
1634 
1635 	do {
1636 		u32 idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
1637 
1638 		if ((idle & gpu->idle_mask) == gpu->idle_mask)
1639 			return 0;
1640 
1641 		if (time_is_before_jiffies(timeout)) {
1642 			dev_warn(gpu->dev,
1643 				 "timed out waiting for idle: idle=0x%x\n",
1644 				 idle);
1645 			return -ETIMEDOUT;
1646 		}
1647 
1648 		udelay(5);
1649 	} while (1);
1650 }
1651 
etnaviv_gpu_hw_suspend(struct etnaviv_gpu * gpu)1652 static void etnaviv_gpu_hw_suspend(struct etnaviv_gpu *gpu)
1653 {
1654 	if (gpu->state == ETNA_GPU_STATE_RUNNING) {
1655 		/* Replace the last WAIT with END */
1656 		mutex_lock(&gpu->lock);
1657 		etnaviv_buffer_end(gpu);
1658 		mutex_unlock(&gpu->lock);
1659 
1660 		/*
1661 		 * We know that only the FE is busy here, this should
1662 		 * happen quickly (as the WAIT is only 200 cycles).  If
1663 		 * we fail, just warn and continue.
1664 		 */
1665 		etnaviv_gpu_wait_idle(gpu, 100);
1666 
1667 		gpu->state = ETNA_GPU_STATE_INITIALIZED;
1668 	}
1669 
1670 	gpu->exec_state = -1;
1671 }
1672 
etnaviv_gpu_hw_resume(struct etnaviv_gpu * gpu)1673 static int etnaviv_gpu_hw_resume(struct etnaviv_gpu *gpu)
1674 {
1675 	int ret;
1676 
1677 	ret = mutex_lock_killable(&gpu->lock);
1678 	if (ret)
1679 		return ret;
1680 
1681 	etnaviv_gpu_update_clock(gpu);
1682 	etnaviv_gpu_hw_init(gpu);
1683 
1684 	mutex_unlock(&gpu->lock);
1685 
1686 	return 0;
1687 }
1688 
1689 static int
etnaviv_gpu_cooling_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)1690 etnaviv_gpu_cooling_get_max_state(struct thermal_cooling_device *cdev,
1691 				  unsigned long *state)
1692 {
1693 	*state = 6;
1694 
1695 	return 0;
1696 }
1697 
1698 static int
etnaviv_gpu_cooling_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)1699 etnaviv_gpu_cooling_get_cur_state(struct thermal_cooling_device *cdev,
1700 				  unsigned long *state)
1701 {
1702 	struct etnaviv_gpu *gpu = cdev->devdata;
1703 
1704 	*state = gpu->freq_scale;
1705 
1706 	return 0;
1707 }
1708 
1709 static int
etnaviv_gpu_cooling_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)1710 etnaviv_gpu_cooling_set_cur_state(struct thermal_cooling_device *cdev,
1711 				  unsigned long state)
1712 {
1713 	struct etnaviv_gpu *gpu = cdev->devdata;
1714 
1715 	mutex_lock(&gpu->lock);
1716 	gpu->freq_scale = state;
1717 	if (!pm_runtime_suspended(gpu->dev))
1718 		etnaviv_gpu_update_clock(gpu);
1719 	mutex_unlock(&gpu->lock);
1720 
1721 	return 0;
1722 }
1723 
1724 static const struct thermal_cooling_device_ops cooling_ops = {
1725 	.get_max_state = etnaviv_gpu_cooling_get_max_state,
1726 	.get_cur_state = etnaviv_gpu_cooling_get_cur_state,
1727 	.set_cur_state = etnaviv_gpu_cooling_set_cur_state,
1728 };
1729 
etnaviv_gpu_bind(struct device * dev,struct device * master,void * data)1730 static int etnaviv_gpu_bind(struct device *dev, struct device *master,
1731 	void *data)
1732 {
1733 	struct drm_device *drm = data;
1734 	struct etnaviv_drm_private *priv = drm->dev_private;
1735 	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
1736 	int ret;
1737 
1738 	if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL)) {
1739 		gpu->cooling = thermal_of_cooling_device_register(dev->of_node,
1740 				(char *)dev_name(dev), gpu, &cooling_ops);
1741 		if (IS_ERR(gpu->cooling))
1742 			return PTR_ERR(gpu->cooling);
1743 	}
1744 
1745 	gpu->wq = alloc_ordered_workqueue(dev_name(dev), 0);
1746 	if (!gpu->wq) {
1747 		ret = -ENOMEM;
1748 		goto out_thermal;
1749 	}
1750 
1751 	ret = etnaviv_sched_init(gpu);
1752 	if (ret)
1753 		goto out_workqueue;
1754 
1755 	if (!IS_ENABLED(CONFIG_PM)) {
1756 		ret = etnaviv_gpu_clk_enable(gpu);
1757 		if (ret < 0)
1758 			goto out_sched;
1759 	}
1760 
1761 	gpu->drm = drm;
1762 	gpu->fence_context = dma_fence_context_alloc(1);
1763 	xa_init_flags(&gpu->user_fences, XA_FLAGS_ALLOC);
1764 	spin_lock_init(&gpu->fence_spinlock);
1765 
1766 	INIT_WORK(&gpu->sync_point_work, sync_point_worker);
1767 	init_waitqueue_head(&gpu->fence_event);
1768 
1769 	priv->gpu[priv->num_gpus++] = gpu;
1770 
1771 	return 0;
1772 
1773 out_sched:
1774 	etnaviv_sched_fini(gpu);
1775 
1776 out_workqueue:
1777 	destroy_workqueue(gpu->wq);
1778 
1779 out_thermal:
1780 	if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL))
1781 		thermal_cooling_device_unregister(gpu->cooling);
1782 
1783 	return ret;
1784 }
1785 
etnaviv_gpu_unbind(struct device * dev,struct device * master,void * data)1786 static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
1787 	void *data)
1788 {
1789 	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
1790 
1791 	DBG("%s", dev_name(gpu->dev));
1792 
1793 	destroy_workqueue(gpu->wq);
1794 
1795 	etnaviv_sched_fini(gpu);
1796 
1797 	if (IS_ENABLED(CONFIG_PM)) {
1798 		pm_runtime_get_sync(gpu->dev);
1799 		pm_runtime_put_sync_suspend(gpu->dev);
1800 	} else {
1801 		etnaviv_gpu_hw_suspend(gpu);
1802 		etnaviv_gpu_clk_disable(gpu);
1803 	}
1804 
1805 	if (gpu->mmu_context)
1806 		etnaviv_iommu_context_put(gpu->mmu_context);
1807 
1808 	etnaviv_cmdbuf_free(&gpu->buffer);
1809 	etnaviv_iommu_global_fini(gpu);
1810 
1811 	gpu->drm = NULL;
1812 	xa_destroy(&gpu->user_fences);
1813 
1814 	if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL))
1815 		thermal_cooling_device_unregister(gpu->cooling);
1816 	gpu->cooling = NULL;
1817 }
1818 
1819 static const struct component_ops gpu_ops = {
1820 	.bind = etnaviv_gpu_bind,
1821 	.unbind = etnaviv_gpu_unbind,
1822 };
1823 
1824 static const struct of_device_id etnaviv_gpu_match[] = {
1825 	{
1826 		.compatible = "vivante,gc"
1827 	},
1828 	{ /* sentinel */ }
1829 };
1830 MODULE_DEVICE_TABLE(of, etnaviv_gpu_match);
1831 
etnaviv_gpu_platform_probe(struct platform_device * pdev)1832 static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
1833 {
1834 	struct device *dev = &pdev->dev;
1835 	struct etnaviv_gpu *gpu;
1836 	int err;
1837 
1838 	gpu = devm_kzalloc(dev, sizeof(*gpu), GFP_KERNEL);
1839 	if (!gpu)
1840 		return -ENOMEM;
1841 
1842 	gpu->dev = &pdev->dev;
1843 	mutex_init(&gpu->lock);
1844 	mutex_init(&gpu->sched_lock);
1845 
1846 	/* Map registers: */
1847 	gpu->mmio = devm_platform_ioremap_resource(pdev, 0);
1848 	if (IS_ERR(gpu->mmio))
1849 		return PTR_ERR(gpu->mmio);
1850 
1851 	/* Get Interrupt: */
1852 	gpu->irq = platform_get_irq(pdev, 0);
1853 	if (gpu->irq < 0)
1854 		return gpu->irq;
1855 
1856 	err = devm_request_irq(&pdev->dev, gpu->irq, irq_handler, 0,
1857 			       dev_name(gpu->dev), gpu);
1858 	if (err) {
1859 		dev_err(dev, "failed to request IRQ%u: %d\n", gpu->irq, err);
1860 		return err;
1861 	}
1862 
1863 	/* Get Clocks: */
1864 	gpu->clk_reg = devm_clk_get_optional(&pdev->dev, "reg");
1865 	DBG("clk_reg: %p", gpu->clk_reg);
1866 	if (IS_ERR(gpu->clk_reg))
1867 		return PTR_ERR(gpu->clk_reg);
1868 
1869 	gpu->clk_bus = devm_clk_get_optional(&pdev->dev, "bus");
1870 	DBG("clk_bus: %p", gpu->clk_bus);
1871 	if (IS_ERR(gpu->clk_bus))
1872 		return PTR_ERR(gpu->clk_bus);
1873 
1874 	gpu->clk_core = devm_clk_get(&pdev->dev, "core");
1875 	DBG("clk_core: %p", gpu->clk_core);
1876 	if (IS_ERR(gpu->clk_core))
1877 		return PTR_ERR(gpu->clk_core);
1878 	gpu->base_rate_core = clk_get_rate(gpu->clk_core);
1879 
1880 	gpu->clk_shader = devm_clk_get_optional(&pdev->dev, "shader");
1881 	DBG("clk_shader: %p", gpu->clk_shader);
1882 	if (IS_ERR(gpu->clk_shader))
1883 		return PTR_ERR(gpu->clk_shader);
1884 	gpu->base_rate_shader = clk_get_rate(gpu->clk_shader);
1885 
1886 	/* TODO: figure out max mapped size */
1887 	dev_set_drvdata(dev, gpu);
1888 
1889 	/*
1890 	 * We treat the device as initially suspended.  The runtime PM
1891 	 * autosuspend delay is rather arbitary: no measurements have
1892 	 * yet been performed to determine an appropriate value.
1893 	 */
1894 	pm_runtime_use_autosuspend(gpu->dev);
1895 	pm_runtime_set_autosuspend_delay(gpu->dev, 200);
1896 	pm_runtime_enable(gpu->dev);
1897 
1898 	err = component_add(&pdev->dev, &gpu_ops);
1899 	if (err < 0) {
1900 		dev_err(&pdev->dev, "failed to register component: %d\n", err);
1901 		return err;
1902 	}
1903 
1904 	return 0;
1905 }
1906 
etnaviv_gpu_platform_remove(struct platform_device * pdev)1907 static int etnaviv_gpu_platform_remove(struct platform_device *pdev)
1908 {
1909 	component_del(&pdev->dev, &gpu_ops);
1910 	pm_runtime_disable(&pdev->dev);
1911 	return 0;
1912 }
1913 
etnaviv_gpu_rpm_suspend(struct device * dev)1914 static int etnaviv_gpu_rpm_suspend(struct device *dev)
1915 {
1916 	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
1917 	u32 idle, mask;
1918 
1919 	/* If there are any jobs in the HW queue, we're not idle */
1920 	if (atomic_read(&gpu->sched.hw_rq_count))
1921 		return -EBUSY;
1922 
1923 	/* Check whether the hardware (except FE and MC) is idle */
1924 	mask = gpu->idle_mask & ~(VIVS_HI_IDLE_STATE_FE |
1925 				  VIVS_HI_IDLE_STATE_MC);
1926 	idle = gpu_read(gpu, VIVS_HI_IDLE_STATE) & mask;
1927 	if (idle != mask) {
1928 		dev_warn_ratelimited(dev, "GPU not yet idle, mask: 0x%08x\n",
1929 				     idle);
1930 		return -EBUSY;
1931 	}
1932 
1933 	etnaviv_gpu_hw_suspend(gpu);
1934 
1935 	gpu->state = ETNA_GPU_STATE_IDENTIFIED;
1936 
1937 	return etnaviv_gpu_clk_disable(gpu);
1938 }
1939 
etnaviv_gpu_rpm_resume(struct device * dev)1940 static int etnaviv_gpu_rpm_resume(struct device *dev)
1941 {
1942 	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
1943 	int ret;
1944 
1945 	ret = etnaviv_gpu_clk_enable(gpu);
1946 	if (ret)
1947 		return ret;
1948 
1949 	/* Re-initialise the basic hardware state */
1950 	if (gpu->state == ETNA_GPU_STATE_IDENTIFIED) {
1951 		ret = etnaviv_gpu_hw_resume(gpu);
1952 		if (ret) {
1953 			etnaviv_gpu_clk_disable(gpu);
1954 			return ret;
1955 		}
1956 	}
1957 
1958 	return 0;
1959 }
1960 
1961 static const struct dev_pm_ops etnaviv_gpu_pm_ops = {
1962 	RUNTIME_PM_OPS(etnaviv_gpu_rpm_suspend, etnaviv_gpu_rpm_resume, NULL)
1963 };
1964 
1965 struct platform_driver etnaviv_gpu_driver = {
1966 	.driver = {
1967 		.name = "etnaviv-gpu",
1968 		.owner = THIS_MODULE,
1969 		.pm = pm_ptr(&etnaviv_gpu_pm_ops),
1970 		.of_match_table = etnaviv_gpu_match,
1971 	},
1972 	.probe = etnaviv_gpu_platform_probe,
1973 	.remove = etnaviv_gpu_platform_remove,
1974 	.id_table = gpu_ids,
1975 };
1976