summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vc4/vc4_v3d.c
blob: c36315924b7d5871dfc4323ec06bb0be845c0263 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/pm_runtime.h>
#include "vc4_drv.h"
#include "vc4_regs.h"

static const struct debugfs_reg32 v3d_regs[] = {
	VC4_REG32(V3D_IDENT0),
	VC4_REG32(V3D_IDENT1),
	VC4_REG32(V3D_IDENT2),
	VC4_REG32(V3D_SCRATCH),
	VC4_REG32(V3D_L2CACTL),
	VC4_REG32(V3D_SLCACTL),
	VC4_REG32(V3D_INTCTL),
	VC4_REG32(V3D_INTENA),
	VC4_REG32(V3D_INTDIS),
	VC4_REG32(V3D_CT0CS),
	VC4_REG32(V3D_CT1CS),
	VC4_REG32(V3D_CT0EA),
	VC4_REG32(V3D_CT1EA),
	VC4_REG32(V3D_CT0CA),
	VC4_REG32(V3D_CT1CA),
	VC4_REG32(V3D_CT00RA0),
	VC4_REG32(V3D_CT01RA0),
	VC4_REG32(V3D_CT0LC),
	VC4_REG32(V3D_CT1LC),
	VC4_REG32(V3D_CT0PC),
	VC4_REG32(V3D_CT1PC),
	VC4_REG32(V3D_PCS),
	VC4_REG32(V3D_BFC),
	VC4_REG32(V3D_RFC),
	VC4_REG32(V3D_BPCA),
	VC4_REG32(V3D_BPCS),
	VC4_REG32(V3D_BPOA),
	VC4_REG32(V3D_BPOS),
	VC4_REG32(V3D_BXCF),
	VC4_REG32(V3D_SQRSV0),
	VC4_REG32(V3D_SQRSV1),
	VC4_REG32(V3D_SQCNTL),
	VC4_REG32(V3D_SRQPC),
	VC4_REG32(V3D_SRQUA),
	VC4_REG32(V3D_SRQUL),
	VC4_REG32(V3D_SRQCS),
	VC4_REG32(V3D_VPACNTL),
	VC4_REG32(V3D_VPMBASE),
	VC4_REG32(V3D_PCTRC),
	VC4_REG32(V3D_PCTRE),
	VC4_REG32(V3D_PCTR(0)),
	VC4_REG32(V3D_PCTRS(0)),
	VC4_REG32(V3D_PCTR(1)),
	VC4_REG32(V3D_PCTRS(1)),
	VC4_REG32(V3D_PCTR(2)),
	VC4_REG32(V3D_PCTRS(2)),
	VC4_REG32(V3D_PCTR(3)),
	VC4_REG32(V3D_PCTRS(3)),
	VC4_REG32(V3D_PCTR(4)),
	VC4_REG32(V3D_PCTRS(4)),
	VC4_REG32(V3D_PCTR(5)),
	VC4_REG32(V3D_PCTRS(5)),
	VC4_REG32(V3D_PCTR(6)),
	VC4_REG32(V3D_PCTRS(6)),
	VC4_REG32(V3D_PCTR(7)),
	VC4_REG32(V3D_PCTRS(7)),
	VC4_REG32(V3D_PCTR(8)),
	VC4_REG32(V3D_PCTRS(8)),
	VC4_REG32(V3D_PCTR(9)),
	VC4_REG32(V3D_PCTRS(9)),
	VC4_REG32(V3D_PCTR(10)),
	VC4_REG32(V3D_PCTRS(10)),
	VC4_REG32(V3D_PCTR(11)),
	VC4_REG32(V3D_PCTRS(11)),
	VC4_REG32(V3D_PCTR(12)),
	VC4_REG32(V3D_PCTRS(12)),
	VC4_REG32(V3D_PCTR(13)),
	VC4_REG32(V3D_PCTRS(13)),
	VC4_REG32(V3D_PCTR(14)),
	VC4_REG32(V3D_PCTRS(14)),
	VC4_REG32(V3D_PCTR(15)),
	VC4_REG32(V3D_PCTRS(15)),
	VC4_REG32(V3D_DBGE),
	VC4_REG32(V3D_FDBGO),
	VC4_REG32(V3D_FDBGB),
	VC4_REG32(V3D_FDBGR),
	VC4_REG32(V3D_FDBGS),
	VC4_REG32(V3D_ERRSTAT),
};

static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
{
	struct drm_info_node *node = (struct drm_info_node *)m->private;
	struct drm_device *dev = node->minor->dev;
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	int ret = vc4_v3d_pm_get(vc4);

	if (ret == 0) {
		uint32_t ident1 = V3D_READ(V3D_IDENT1);
		uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
		uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
		uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);

		seq_printf(m, "Revision:   %d\n",
			   VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
		seq_printf(m, "Slices:     %d\n", nslc);
		seq_printf(m, "TMUs:       %d\n", nslc * tups);
		seq_printf(m, "QPUs:       %d\n", nslc * qups);
		seq_printf(m, "Semaphores: %d\n",
			   VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
		vc4_v3d_pm_put(vc4);
	}

	return 0;
}

/**
 * Wraps pm_runtime_get_sync() in a refcount, so that we can reliably
 * get the pm_runtime refcount to 0 in vc4_reset().
 */
int
vc4_v3d_pm_get(struct vc4_dev *vc4)
{
	mutex_lock(&vc4->power_lock);
	if (vc4->power_refcount++ == 0) {
		int ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);

		if (ret < 0) {
			vc4->power_refcount--;
			mutex_unlock(&vc4->power_lock);
			return ret;
		}
	}
	mutex_unlock(&vc4->power_lock);

	return 0;
}

void
vc4_v3d_pm_put(struct vc4_dev *vc4)
{
	mutex_lock(&vc4->power_lock);
	if (--vc4->power_refcount == 0) {
		pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
		pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
	}
	mutex_unlock(&vc4->power_lock);
}

static void vc4_v3d_init_hw(struct drm_device *dev)
{
	struct vc4_dev *vc4 = to_vc4_dev(dev);

	/* Take all the memory that would have been reserved for user
	 * QPU programs, since we don't have an interface for running
	 * them, anyway.
	 */
	V3D_WRITE(V3D_VPMBASE, 0);
}

int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
{
	struct drm_device *dev = vc4->dev;
	unsigned long irqflags;
	int slot;
	uint64_t seqno = 0;
	struct vc4_exec_info *exec;

try_again:
	spin_lock_irqsave(&vc4->job_lock, irqflags);
	slot = ffs(~vc4->bin_alloc_used);
	if (slot != 0) {
		/* Switch from ffs() bit index to a 0-based index. */
		slot--;
		vc4->bin_alloc_used |= BIT(slot);
		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
		return slot;
	}

	/* Couldn't find an open slot.  Wait for render to complete
	 * and try again.
	 */
	exec = vc4_last_render_job(vc4);
	if (exec)
		seqno = exec->seqno;
	spin_unlock_irqrestore(&vc4->job_lock, irqflags);

	if (seqno) {
		int ret = vc4_wait_for_seqno(dev, seqno, ~0ull, true);

		if (ret == 0)
			goto try_again;

		return ret;
	}

	return -ENOMEM;
}

/**
 * vc4_allocate_bin_bo() - allocates the memory that will be used for
 * tile binning.
 *
 * The binner has a limitation that the addresses in the tile state
 * buffer that point into the tile alloc buffer or binner overflow
 * memory only have 28 bits (256MB), and the top 4 on the bus for
 * tile alloc references end up coming from the tile state buffer's
 * address.
 *
 * To work around this, we allocate a single large buffer while V3D is
 * in use, make sure that it has the top 4 bits constant across its
 * entire extent, and then put the tile state, tile alloc, and binner
 * overflow memory inside that buffer.
 *
 * This creates a limitation where we may not be able to execute a job
 * if it doesn't fit within the buffer that we allocated up front.
 * However, it turns out that 16MB is "enough for anybody", and
 * real-world applications run into allocation failures from the
 * overall CMA pool before they make scenes complicated enough to run
 * out of bin space.
 */
static int vc4_allocate_bin_bo(struct drm_device *drm)
{
	struct vc4_dev *vc4 = to_vc4_dev(drm);
	struct vc4_v3d *v3d = vc4->v3d;
	uint32_t size = 16 * 1024 * 1024;
	int ret = 0;
	struct list_head list;

	/* We may need to try allocating more than once to get a BO
	 * that doesn't cross 256MB.  Track the ones we've allocated
	 * that failed so far, so that we can free them when we've got
	 * one that succeeded (if we freed them right away, our next
	 * allocation would probably be the same chunk of memory).
	 */
	INIT_LIST_HEAD(&list);

	while (true) {
		struct vc4_bo *bo = vc4_bo_create(drm, size, true,
						  VC4_BO_TYPE_BIN);

		if (IS_ERR(bo)) {
			ret = PTR_ERR(bo);

			dev_err(&v3d->pdev->dev,
				"Failed to allocate memory for tile binning: "
				"%d. You may need to enable CMA or give it "
				"more memory.",
				ret);
			break;
		}

		/* Check if this BO won't trigger the addressing bug. */
		if ((bo->base.paddr & 0xf0000000) ==
		    ((bo->base.paddr + bo->base.base.size - 1) & 0xf0000000)) {
			vc4->bin_bo = bo;

			/* Set up for allocating 512KB chunks of
			 * binner memory.  The biggest allocation we
			 * need to do is for the initial tile alloc +
			 * tile state buffer.  We can render to a
			 * maximum of ((2048*2048) / (32*32) = 4096
			 * tiles in a frame (until we do floating
			 * point rendering, at which point it would be
			 * 8192).  Tile state is 48b/tile (rounded to
			 * a page), and tile alloc is 32b/tile
			 * (rounded to a page), plus a page of extra,
			 * for a total of 320kb for our worst-case.
			 * We choose 512kb so that it divides evenly
			 * into our 16MB, and the rest of the 512kb
			 * will be used as storage for the overflow
			 * from the initial 32b CL per bin.
			 */
			vc4->bin_alloc_size = 512 * 1024;
			vc4->bin_alloc_used = 0;
			vc4->bin_alloc_overflow = 0;
			WARN_ON_ONCE(sizeof(vc4->bin_alloc_used) * 8 !=
				     bo->base.base.size / vc4->bin_alloc_size);

			break;
		}

		/* Put it on the list to free later, and try again. */
		list_add(&bo->unref_head, &list);
	}

	/* Free all the BOs we allocated but didn't choose. */
	while (!list_empty(&list)) {
		struct vc4_bo *bo = list_last_entry(&list,
						    struct vc4_bo, unref_head);

		list_del(&bo->unref_head);
		drm_gem_object_put_unlocked(&bo->base.base);
	}

	return ret;
}

#ifdef CONFIG_PM
static int vc4_v3d_runtime_suspend(struct device *dev)
{
	struct vc4_v3d *v3d = dev_get_drvdata(dev);
	struct vc4_dev *vc4 = v3d->vc4;

	vc4_irq_uninstall(vc4->dev);

	drm_gem_object_put_unlocked(&vc4->bin_bo->base.base);
	vc4->bin_bo = NULL;

	clk_disable_unprepare(v3d->clk);

	return 0;
}

static int vc4_v3d_runtime_resume(struct device *dev)
{
	struct vc4_v3d *v3d = dev_get_drvdata(dev);
	struct vc4_dev *vc4 = v3d->vc4;
	int ret;

	ret = vc4_allocate_bin_bo(vc4->dev);
	if (ret)
		return ret;

	ret = clk_prepare_enable(v3d->clk);
	if (ret != 0)
		return ret;

	vc4_v3d_init_hw(vc4->dev);

	/* We disabled the IRQ as part of vc4_irq_uninstall in suspend. */
	enable_irq(vc4->dev->irq);
	vc4_irq_postinstall(vc4->dev);

	return 0;
}
#endif

static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = to_vc4_dev(drm);
	struct vc4_v3d *v3d = NULL;
	int ret;

	v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
	if (!v3d)
		return -ENOMEM;

	dev_set_drvdata(dev, v3d);

	v3d->pdev = pdev;

	v3d->regs = vc4_ioremap_regs(pdev, 0);
	if (IS_ERR(v3d->regs))
		return PTR_ERR(v3d->regs);
	v3d->regset.base = v3d->regs;
	v3d->regset.regs = v3d_regs;
	v3d->regset.nregs = ARRAY_SIZE(v3d_regs);

	vc4->v3d = v3d;
	v3d->vc4 = vc4;

	v3d->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(v3d->clk)) {
		int ret = PTR_ERR(v3d->clk);

		if (ret == -ENOENT) {
			/* bcm2835 didn't have a clock reference in the DT. */
			ret = 0;
			v3d->clk = NULL;
		} else {
			if (ret != -EPROBE_DEFER)
				dev_err(dev, "Failed to get V3D clock: %d\n",
					ret);
			return ret;
		}
	}

	if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
		DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
			  V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
		return -EINVAL;
	}

	ret = clk_prepare_enable(v3d->clk);
	if (ret != 0)
		return ret;

	ret = vc4_allocate_bin_bo(drm);
	if (ret) {
		clk_disable_unprepare(v3d->clk);
		return ret;
	}

	/* Reset the binner overflow address/size at setup, to be sure
	 * we don't reuse an old one.
	 */
	V3D_WRITE(V3D_BPOA, 0);
	V3D_WRITE(V3D_BPOS, 0);

	vc4_v3d_init_hw(drm);

	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
	if (ret) {
		DRM_ERROR("Failed to install IRQ handler\n");
		return ret;
	}

	pm_runtime_set_active(dev);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
	pm_runtime_enable(dev);

	vc4_debugfs_add_file(drm, "v3d_ident", vc4_v3d_debugfs_ident, NULL);
	vc4_debugfs_add_regset32(drm, "v3d_regs", &v3d->regset);

	return 0;
}

static void vc4_v3d_unbind(struct device *dev, struct device *master,
			   void *data)
{
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = to_vc4_dev(drm);

	pm_runtime_disable(dev);

	drm_irq_uninstall(drm);

	/* Disable the binner's overflow memory address, so the next
	 * driver probe (if any) doesn't try to reuse our old
	 * allocation.
	 */
	V3D_WRITE(V3D_BPOA, 0);
	V3D_WRITE(V3D_BPOS, 0);

	vc4->v3d = NULL;
}

static const struct dev_pm_ops vc4_v3d_pm_ops = {
	SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
};

static const struct component_ops vc4_v3d_ops = {
	.bind   = vc4_v3d_bind,
	.unbind = vc4_v3d_unbind,
};

static int vc4_v3d_dev_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &vc4_v3d_ops);
}

static int vc4_v3d_dev_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &vc4_v3d_ops);
	return 0;
}

const struct of_device_id vc4_v3d_dt_match[] = {
	{ .compatible = "brcm,bcm2835-v3d" },
	{ .compatible = "brcm,cygnus-v3d" },
	{ .compatible = "brcm,vc4-v3d" },
	{}
};

struct platform_driver vc4_v3d_driver = {
	.probe = vc4_v3d_dev_probe,
	.remove = vc4_v3d_dev_remove,
	.driver = {
		.name = "vc4_v3d",
		.of_match_table = vc4_v3d_dt_match,
		.pm = &vc4_v3d_pm_ops,
	},
};